Ginzburg Essays - Visual Arts, Art History, Painting, Style

Ginzburg Proceeding from the following quote, briefly explain Ginzburg's historical model of stylistic change, referring back to Volliet-le-Duc and Gottfried Semper wherever appropriate. ?A Flower grows in the field because it cannot help but to grow: thus it cannot contemplate whether or not it is appropriate to the field that existed before it. On the contrary, by its very appearance, the flower transforms the general image of the field? Ginzburg talks about the formal development of styles and how the modern architecture is grown from the past but isn't necessarily based on the past. These ideas are very much shared by Semper. This growth is singular and linear, based on a preceding proposition, each out growing the latter, but not continuing the old. a person making use of the achievements in electricity cannot, under any circumstances, be forced to revert to steam power. Gottfried Semper explains this form of thinking very well in that, we learn from the past, we cannot copy it, as this is a waste but rather we cannot turn our backs on this existing knowledge, and previous epochs. The development and changing of styles is a meshed concept. There is no end or beginning of styles. Ginzburg explains the life of a particular style as a growing organism in that it is born, ?lives out its youth?, matures and lives out it's old age, but never dies, but rather atrophies. This is why the actual timing of a style is impossible to track, for there is no death of a style, the life of the style atrophies. Styles cannot be erased because they are not physical elements to knocked down and demolished. So when an epoch forms, there is a trace of the old style, a marking, like a child would have of his parents. Each style has a genetic imprint of its parent, history. ?A flower grows in the field because it cannot help but to grow A flower germinates in the grown and is thus, it is born. This organism grows in its field, no choices, no alternatives, but it still grows. This flower could wither and die, for what difference would it make? But does it know that it's individual expression of color and aroma could be the single characteristic that beautifies its surroundings. A style that in it's own being, transforms a hideous field into a breathtaking space. This theory of style stands true to the linear growth of architecture. Style will continue to grow and thrive, without its own predetermined plan. Each bit of architecture is born, and lives through maturity. This excerpt is taken from the given quote above. It assesses the revolution Ginzburg prescribing for Russia. Ginzburg talks about how the architects in Russia, like the flower, doesn't have the choice of banishing the historical development of architecture. But that their styles can transfo rm this field into a flowering spectacle.

The Story of Beatrix Potter

The Story of Beatrix Potter Free Online Research Papers Helen Beatrix Potter was born on Saturday, July 28, 1866 at 2 Bolton Gardens, South Kensington, Middlesex in the country of England. She was the first child born to Rupert and Helen Potter; a well-to-do London couple who were heirs to a cotton fortune. Her father Rupert Potter was a prosperous lawyer. He was also an enthusiastic and skilled photographer who enjoyed not only taking photographs of his family and friends but also the ever changing scenes on the streets of London. Miss Potter’s mother, Helen Potter, was a simple country gentlewoman who became a social London lady after she married Rupert Potter. Prior to marriage she had enjoyed painting with water colors and frolicking in the countryside. As a married woman she engaged in carriage rides and afternoon tea with other socialite ladies of London and then back home to prepare herself for frequent elaborate dinner parties. When Rupert and Helen Potter married in 1863 they lived in Upper Harley Street, a fashionable part of London at the time. When Helen became pregnant they moved to 2 Bolton Gardens in Kensington where they remained until Rupert’s death nearly fifty years later. The third floor nursery in Bolton Gardens was Beatrix Potter’s playroom, schoolroom, and eventually studio for the forty seven years following her birth. In the time which Beatrix Potter was born it was customary for children to be cared for by either a nurse or governess. Beatrix spent much of her childhood in solitude, only seeing her parents at bedtime and on special occasions. The Potter’s hired a young woman, Nurse McKenzie, from the Highlands of Scotland, where the Potters went for their holiday every summer. Nurse McKenzie looked after and cared for Beatrix with strict and spartan attention. She fed her, dressed her, helped her to crawl and walk, taught her her first words and introduced her to fairies. When Beatrix was almost six years old, her brother Walter Bertram was born. Now that there were two children to be looked after by Nurse McKenzie it was natural that Beatrix became more independent and learned to do things on her own. She had inherited her parents’ artistic talents and discovered the pleasure it gave her to draw and paint. She began to take more notice of the pictures in the books she was reading and continued to develop her talents. Her parents encouraged her greatly and began to increase the supply of new books in the nursery for her enjoyment. Now that Nurse McKenzie was caring for the new baby Mr. and Mrs. Potter hired a governess to care for Beatrix. Miss Hammond came to start her education and began to teach reading, writing, and arithmetic. Time was also set aside each day for painting and drawing. When Beatrix turned twelve another governess, Miss Cameron, was hired to specifically teach her drawing. Beatrix became very fond of Miss Hammond who filled the days with learning, playing and exploring. Miss Hammond encouraged young Beatrix to read, write and explore the world around her. She was very kind and full of constant praise directing Beatrix to become the best she could imagine. When Beatrix became a teenager her parents decided that Miss Hammond had done all the teaching she could and then hired another governess, Miss Annie Carter. Miss Carter taught German and French and other language skills. More importantly, she taught Beatrix how to enjoy each day to the fullest and capture the splendor around her through writing, drawing, and painting. Miss Carter stayed on with the Potter family until Beatrix was nineteen. From a young age, Beatrix was fascinated by nature. Her family went on annual summer holidays in Scotland and the Lake District. Her parents often rented the Dalguise House, near Dunkeld on the river Tay in Perthshire, Scotland. Beatrix had many fond memories there and even used it as the location for her story, The Tale of Jeremy Fisher. These summer holidays in the country provided a prolonged and recurring happiness that Beatrix treasured throughout her life. Mr. Potter would engage in long exploratory walks with his children during these summer holidays and it was there that Beatrix and Bertram collected animals, skeletons and fossils together. They sketched and painted pictures of the plants and animals they saw; and often went to the Natural History Museum to learn more. These holidays in the country provided Beatrix with not only hands-on experience, but also a deep love and knowledge of the countryside. She had a deep love for animals and acquired many pets in different forms . Each of her lovely pets would later serve as characters in her writings and drawings. Although Beatrix’s childhood was abnormally secluded and lonely due in part to the fact that both her parents discouraged their children to have close friendships with others for fear of exposure to germs and bad influences, this allowed Beatrix to concentrate on her own fantasies and interests†¦ animals, drawing, writing, nature. Bertram was six years younger than Beatrix and she loved him dearly. She shared much with him but could not share all that she desired. Judy Taylor explains that â€Å"The substitute for human companionship for Beatrix were her pets – and a diary. To ensure that her journal was kept secret from prying eyes, particularly her mother’s, Beatrix invented a code.† (P. 34.Taylor). The code for her journal was not broken until 1958, several years after her death. When Beatrix was in her twenties, she made a minor scientific discovery in regards to spores of moulds. Since she was basically self-taught, her work was not only under suspicion but also scrutiny by botanists at the Royal Botanic Gardens. She wrote a paper on the subject which was presented by her uncle Sir Henry Enfield Roscoe in 1897 before the Linnean Society of London. Women were not allowed to attend meetings so the paper was could not be read by Beatrix. However, her discovery and theories were eventually proved correct and many years later were recognized by the Society. In 1997, the Society issued an official apology to Miss Potter for the way she had been treated. Beatrix loved to write and aside from her journal which she wrote in almost on a daily basis describing events and situations from her life, she also began to create drawings of her beloved pets; especially her rabbit Benjamin Bouncer. 1889 she began to submit her drawings to publishers who used them on greeting cards and in 1891 submitted several sketches to a number of publishers which were readily used in children’s books and children’s quarterlies On September 4, 1893, Beatrix wrote a picture letter to her former governess’ son, Noel Moore. Noel was five years old and had fallen ill. Beatrix was not sure how to write to him so she proceeded to tell him a story about four little rabbits named Mopsy, Flopsy, Cotton-tail, and Peter. This beautifully illustrated letter was so well-received that Beatrix decided to publish it privately as The Tale of Peter Rabbit in 1900. At first she was rejected by five publishers, but on December 16, 1901 it was published by Frederick Warne Company and was a great success. The basis of Miss Potter’s many stories were the small animals that she smuggled into the house or observed during family holidays in Scotland and the Lake District. The characters she chose correlated with people and places that touched her life on a daily basis. These beautifully crafted stories described the adventures of Benjamin Bunny (Peter’s Cousin), Pig Robinson, Squirrel Nutkin and many more of Miss Potter’s delightful little ‘friends’. Each story was unique in its own and was full of sketches, descriptions of animals that Miss Potter loved, and descriptions of holidays by the seaside, and in Wales, Scotland, and other places that she enjoyed. She truly encompassed all aspects of the life around her into the stories she wove. As she was preparing to have another book published, Miss Potter began to correspond with Norman Warne, the son of the founder of the publishing company which she was now employed by. Norman was the one person whom Miss Potter turned for support and he always gave her the most encouragement. Their friendship grew stronger with each passing day and in the summer of 1905 Norman proposed marriage. Miss Potter was overjoyed by Norman’s proposal but knew that receiving consent from her parents, particularly her mother, would be a big obstacle to overcome. As expected, her parents were not pleased with the proposal because Norman’s family was not part of the London elite but rather a family of trade. However, her parents agreed there could be a wedding but only if Beatrix and Norman waited one full year before announcing their engagement. This way if either changed their mind there would be no embarrassment to the family. Margaret Lane writes, â€Å"Her (Beatrix) mind nevertheless was made up and the struggle carried on in unhappy silence. No announcement was made and almost nobody told, but Beatrix now firmly considered herself betrothed and wore her engagement ring.† (p. 137.) However, the wedding was not to be, for soon after the proposal, on August 25, 1905 Norman fell ill and died. Beatrix was devastated. Happiness did not come very easily in the weeks that followed and the summer of 1905 was difficult and full of struggle. Beatrix buried herself in her work and continued to write the stories she had been sharing and planning with Norman. She spent her time at the property she had purchased in the Lake District with the royalties from The Tales of Peter Rabbit. As the months of autumn approached she began to feel very ill but she struggled on and continued to write another book. When the opportunity to purchase another property came available Miss Potter acted quickly. She purchased a working farm in Near Sawrey called Hill Top. She started out with a few pigs and soon acquired sixteen Herdwick sheep, native to the Lake District. Herdwick sheep were a hardy breed that had wool which was prized for its hardwearing and waterproof qualities, especially for clothing and carpets. After just two years, Hill Top Farm had over thirty Herdwicks, ten cows, fourteen pigs, several ducks and many hens. There were also several dogs. Beatrix enjoyed her farm and even though it began to take up more of her attention, â€Å"she continued to work on her little books and used her animals and property to the full as models and as source material.† (p. 111. Taylor.) The Tale of Tom Kitten, published in 1907, was set in the house and garden of Hill Top Farm and in the village of Sawrey. In the pictures she drew the garden of Hill Top is in full bloom like a flower show. The interior of the little house is exactly as the house was when Beatrix moved in. Tom Kitten’s mother was named after the cat in the house where Beatrix stayed. Likewise, The Tale of Jemima Puddle-duck, published in 1908, was also set on the farm at Hill Top and the surrounding village. Jemima was a special duck who often amused Beatrix with her maternal problems of attempting to create a nest for her eggs. Jemima would journey throughout the farm looking for that secret place to care for her eggs and Beatrix would follow her and sketch the area which she trekked. Interestingly enough, the field which Jemima journeyed across would eventually be, thirty six years later, Beatrix Potter’s resting place. Her ashes were scattered in the field at the edge of Jemima’s woods, looking back to Sawrey. Beatrix spent more and more time at Sawrey and in 1909 she bought another farm there. Castle Farm had a small house facing her Hill Top Farm and gave her a grand view of the property she owned. She had farm hands that cared for her properties but she was also very much involved with both. By 1912, Beatrix owned a considerable amount of land in and around Sawrey. In all her property dealings she had taken advice from a local firm and was looked after by William Heelis. He informed her of properties which were coming available to the market, attended sales on her behalf, and took care of the contracts. Beatrix and William had developed a keen friendship and by the end of 1912 William had proposed to Beatrix and she accepted. On October 14, 1913 Beatrix Potter and William Heelis were married in London. After her marriage, Beatrix was able to settle in to the Lake District permanently where she took on an active role in caring for her farms. She loved her animals and enjoyed all the time she could with them. For several more years she turned all her energy toward farming and in 1924 she bought a spectacular hill farm in the Lake District named Troutbeck Park Farm. It had a stone farmhouse with over 2,000 acres supporting hundreds of sheep, the majority being the Herdwicks. Beatrix became a respected farmer, a judge at agricultural shows, and President of the Herdwick Sheep Breeders’ Association. Beatrix Potter died on December 22, 1943. She was more than an author of little books for children. She was an amazing artist, a farmer and landowner, a breeder, and a philanthropist. She is remembered both through her lovely books, which continue to be cherished by children today, and through the lovely Lake District in England, which she helped to preserve even at her death by bequeathing Hill Top Farm and over 4,000 acres to the National Trust. Cumulative bibliography: Aldis, Dorothy. Nothing is impossible: The story of Beatrix Potter. Peter Smith Publ. 1988 Lane, Margaret. The magic years of Beatrix Potter. Frederick Warne Co. 1978. Linder, Leslie. A history of the writings of Beatrix Potter, Warne 1971. Potter, Beatrix The Tale of Jeremy Fisher Warne 2001 Potter, Beatrix The Tale of Benjamin Bunny Warne 2002 Potter, Beatrix The Tale of Jemima Puddle-Duck Warne 2002 Potter, Beatrix The tale of Peter Rabbit. Warne 2007. Potter, Beatrix The Tale of Tom Kitten Warne 2002 Taylor, Judy. Beatrix Potter: artist, storyteller and countrywoman. Warne 1986 Research Papers on The Story of Beatrix PotterHip-Hop is ArtQuebec and CanadaDistance Learning Survival GuideInfluences of Socio-Economic Status of Married MalesNever Been Kicked Out of a Place This Nice19 Century Society: A Deeply Divided EraStandardized TestingThe Effects of Illegal ImmigrationAmerican Central Banking and OilThe Relationship Between Delinquency and Drug Use

Business Project High School Assignment Example | Topics and Well Written Essays - 1000 words

Business Project High School - Assignment Example 3. Target Market - the target market for the business is the small business owners especially in the Bondi junction area of Australia. The reason behind this is the number of office goers and the numbers of foreigners who actually know more about the organic food and also who are more interested in organic food consumption are relatively high. Also, if the small business owners are targeted, it will be easy to handle them and also the amount of risk is relatively less. 4. Consumer Analysis - The organic food industry in Australia booming. According to a recent study, currently the cost of the organic food market in Australia is $200-$250 million per year. This figure is restricted to the domestic market alone. Apart from this the amount of organic food exports is $50-$80 million per year. There is approximately 20-30% of consumer demand in the market for organic foods. The annual growth of the organic food market in Australia is estimated to be 60%. 5. Reaching the customers - In order to reach the customers either e-mail marketing can be considered or even point-of-sales advertising also can be considered. Both the methods are equally advantageous. Flyers also can be distributed. These have got the flexibility in color, shape and dimensions. Also the sales promotion activities can be linked up with the point-of-sales advertisings. ... 4. Consumer Analysis - The organic food industry in Australia booming. According to a recent study, currently the cost of the organic food market in Australia is $200-$250 million per year. This figure is restricted to the domestic market alone. Apart from this the amount of organic food exports is $50-$80 million per year. There is approximately 20-30% of consumer demand in the market for organic foods. The annual growth of the organic food market in Australia is estimated to be 60%. 5. Reaching the customers - In order to reach the customers either e-mail marketing can be considered or even point-of-sales advertising also can be considered. Both the methods are equally advantageous. Flyers also can be distributed. These have got the flexibility in color, shape and dimensions. Also the sales promotion activities can be linked up with the point-of-sales advertisings. This way there would be value addition. 6. The competition - The major source of competition would be the already existing players in the market. Apart from them non-organic producers who carry out mass production also can be a threat to the business. Carrying out an industry analysis would help in identifying the number of players in the market and their respective market share. Price differences between the competitor and our product over a particular period needs to be observed and analyzed. Depending on the analysis and alongside keeping the profit margin in mind the prices of the products can be revised. Also the transportation costs, production costs etc need to be analyzed. The cost of shipping the products to other places between the competitors can be identified and analyzed. Foods that have high potential and consumer demand need to

Metabical Case Questions Study Example | Topics and Well Written Essays - 1000 words

Metabical Questions - Case Study Example From this paper it is clear that once the need is recognized and the problem identified, consumers engage in information search during which they attempt to find proper solutions to the problems. Consumers acquire information from various sources in order to make independent decisions and evaluate the options available for them. Information during this stage can be acquired from the internet, newspapers and even magazines. Once the information on the product of choice is acquired, consumers undergo a process of evaluating the alternatives available. This is done through the analysis of different product brands in stock within the market and whether they can fulfill a current need. During this stage, consumers may also engage other players within the market to acquire information on the different products available.This discussion highlights that  after critical evaluation of the alternatives in the market, the consumers can either decide to make a purchase or not based on how convi nced they are. In this case, the consumer may decide to engage in the metabolic weight loss program based on whether the information acquired was convincing enough or not. During this stage, the consumer determines whether the purchase was well informed and whether a similar decision can be made in the future.  Cognitive dissonance will be embraced in this instance to demonstrate whether the consumer's decision was right.

Joint Commission Safety Essay Example | Topics and Well Written Essays - 750 words

Joint Commission Safety - Essay Example Joint Commission Safety The National Patient Safety Goals (NPSGs) were established in 2002 to help accredited organizations address specific areas of concern in regards to patient safety. NPSGs encompass 15 goals and areas concerned include patient identification, caregiver communication, medication safety, control and prevention of health-care associated infections, medication reconciliation, fall reduction, vaccinations, surgical fire prevention, patient involvement, pressure ulcers, and risk assessment. According to the Joint Commission (2012), the National Patient Safety Goals for 2012 focus on the following: improvement of the accuracy of patient identification through use of at least two patient identifiers in providing care, treatment and services and elimination of transfusion errors related to patient misidentification; improvement of communication effectiveness among caregivers by timely reporting of critical results of tests and diagnostic procedures; improvement of medica tion safety by labeling all medications, containers, and solutions in the perioperative and procedural settings, reducing harm from use of anticoagulant therapy, and maintaining and communicating accurate patient medication information; reduction of risk from health-care associated infections through compliance with hand hygiene guidelines set by the Centers for Disease Control and Prevention (CDC) or World Health Organization (WHO) and implementation of evidence-based practices to prevent health care-associated infections, central line-associated bloodstream infections, surgical site infections and indwelling catheter-associated urinary tract infections (CAUTI); reduction of patient harm from falls by addressing the risk; prevention of health care-associated pressure ulcers (decubitus ulcers) through assessment and taking action of the identified risks; and organizational identification of safety risks per patient population such as risk for suicide, risk of home fires from patient receiving oxygen therapy at home, and incidence of wrong site, wrong procedure and wrong person surgery (n.p). The 2012 NPSGs is applicable to the hospital and critical access hospital accreditation programs with focus on health care-associated infections, particularly catheter-associated urinary tract infection (CAUTI). Falls are the leading cause of injury and death among the elderly. According to the CDC (2012), there are 2.2 million nonfatal fall injuries among elderly treated in emergency department in 2009 and 581,000 of which were hospitalized while 19,700 elderly died from unintentional fall injuries in 2008 (n.p.). The injury and mortality associated with falls among elderly could have been prevented if the hospitals and staff strictly adhered to the Joint Commission’s NPSG of reducing the risk of patient harm resulting from falls. Elderly patients are at risk for falls because of decrease cognitive ability, age-related factors affecting stability, and different pat hologic conditions (Grayson, 2006, 84-85). The goal requires health care institutions to implement and evaluate a fall reduction program in order to reduce the risk of injury should a fall occurs and provide services to specific population. Evaluation of risks for falls include taking fall history, review of medications and alcohol consumption, screening gait and balance walking aids, and assessment of assistive technologies, protective devices, and environments. The

Factors Affecting Postharvest Quality of Fresh Fruits

Factors Affecting Postharvest Quality of Fresh Fruits A ripened ovary of a flower together with any accessory part associated with, is referred to as fruit (Lewis Robert 2002). In non-technical usage the term fruit normally means the fleshy seed-associated structures of certain plants that are sweet and edible in the raw state, for example apples, oranges, grapes, strawberries and bananas (Mauseth James, 2003). Fresh fruits and vegetables are living tissues which undergo continuous changes after harvest. Some of these changes are desirable, but from consumers point of view most of them are undesirable. It is not possible to stop the postharvest changes in fresh produce, but they can be retarded within certain limits (Kader, 2002). There are several atmospheric factors which affect the postharvest life of fresh fruits. Climatic conditions, specially temperature and light have a significant effect on the nutritional quality of fresh fruits and vegetables (Kader, 2002). FACTORS AFFECTING THE POSTHARVEST LIFE OF FRUIT RESPIRATION Respiration is the process by which stored organic materials are broken down into simple end products with a release of energy. During this process oxygen (O2) is consumed while carbon dioxide (CO2) is produced. All living organisms must carry out respiration at all times (Kader, 2002). Respiration Metabolism Even after the harvest, fruits and vegetables remain as living organs. Like all living tissues, harvested produce continues to respire throughout its postharvest life. The main purpose of respiration is to maintain sufficient supply of adenosine triphosphate (ATP).The process of aerobic respiration involves the regeneration of ATP from ADP (adenosine diphosphate) and Pi (inorganic phosphate) with the release of CO2 and H2O. In case of hexose sugar the overall reaction can be written as (Kader Saltveit, 2003) The different components in this reaction have different sources of destinations. The 1 mole of glucose (180g) can come from stored simple sugars (glucose, sucrose) or complex polysaccharides (starch). The 6 moles of O2 (192g) used to oxydize the 1 mole of glucose diffuses into the tissue from the surrounding atmosphere, while the 6 mole of CO2 (264g) diffuses out of the tissue. The 6 mole of water (108g) produced is simply incorporated into the aqueous solution of the cell.(Kader Saltveit, 2003) Aerobic respiration involeves a series of three reactions, each of which is catalyzed by a number of specific enzymes that either (i) add a phosphate group to a molecule, (ii) rearrange the molecule, or (iii) break down the molecule to a simpler one ((Biale, 1960);(Davies, 1980)). The three interconnected metabolic pathways are glycolysis, the tricarboxylic acid (TCA) and the electron transport system. Glycolysis The breakdown of glucose occurs in the cytoplasm, which produce two molecules of pyruvate. 10 different sequential reactions are catalysed by one enzyme. Phosphofructokinase (PFK) is the main enzyme in Glycolysis, which cleaves fructose 1, 6-diphosphate into two triose phosphate molecules. By controlling PFK activity of Glycolysis, cell can control their rate of energy production. ATP is used as a negative feedback inhibitor to control the activity of PFK (Davies, 1980). Besides pyruvate, Glycolysis also produces two molecules of ATP and two molecule of NADH (reduced nicotinamide adenine dinucleotide) from the breakdown of each molecule of glucose. Tricarboxylic Acid (TCA) Cycle The TCA cycle occur in mitochondrial matrix, involves in the breakdown of pyruvate into CO2 in nine sequential enzymatic reactions. Pyruvate is decarboxylated to form acetate, which condenses with a co enzyme to form Acetyl CoA. This compound then enters the cycle by condensation with oxaloacetate to form citric acid. Citric acid has three carboxyl groups, from which the cycle derives its name (Kader Saltveit, 2003). Through a series of seven successive rearrangements, oxidations and decarboxylations, citric acid is converted into oxaloacetate, which is then ready to accept another acetyl CoA molecule. The TCA cycle also produces one molecule of FADH2 (reduced flavin adenine dinucleotide) and four molecules of NADH for each molecule of pyruvate metabolism. Electron Transport System The electron transport system occurs in the cristae of mitochondria, results in the production of ATP from the FADH2 and NADH. The energy produced is more than the cellular process requirement. In a series of reactions, one NADH molecule produces three ATP molecules and one FADH2 molecule produces two ATP molecules, but the exact number of ATP produced during electron transport depends not only on the energy of NADH and FADH2 but also on the chemical environment within the cell and mitochondria. In the absence of O2, NADH and FADH2 accumulates, the TCA cycle stops and Glycolysis become the only source of ATP production. In anaerobic respiration hexose sugar is converted into alcohol and CO2 in the absence of O2. Pyruvate produced in Glycolysis is decarboxylated by the enzyme pyruvate carboxylase to form CO2 and acetaldehyde. The acetaldehyde is converted by the enzyme alcohol dehydrogenase to ethanol with regeneration of NAD+. Two moles of ATP and 21 kcal of heat energy are produced in anaerobic respiration (alcoholic fermentation) from each molecule of glucose (Kader Saltveit, 2003). Respiration Quotient (RQ) The respiration quotient (RQ) determines the amount of substrates utilized in the respiration process. In other words RQ is the ratio of CO2 produced to O2 consumed measured in mole or volumes. In the aerobic respiration of carbohydrates the RQ is near 1, while is 1 for organic acids. Very high RQ values usually indicate anaerobic respiration in those tissues which produce ethanol. GAS EXCHANGE Barrier to Diffusion Gas exchange between a plant organ and its environment follows Ficks first law of diffusion. The sequential steps are (i) diffusion in the gas phase through the dermal system (i.e. cuticle, epidermis, stomata etc.); (ii) diffusion in the gas phase between the intercellular spaces; (iii) exchange of gases between the intercellular atmosphere and the cellular solution (cell sap) and (iv) diffusion in solution within the cell to centres of O2 consumption and from centers of CO2 production. This exchange is a function of the resistance of the dermal system to gas diffusion, the surface area across which diffusion can take place etc. CO2 produced within each cell will raise the local concentration and this will drive diffusion of CO2 outward, toward the lower concentration near the cell-wall surface adjacent to the intercellular space. Diffusion of CO2 into intercellular space continues toward regions of lower concentration until it reaches the intercellular space below the dermal system. From there, CO2 moves through the cuticle or openings in the commoditys surface to the air (Burton, 1982). Movement of O2 within plant tissue is in a reverse but similar process to that mentioned above for CO2. In senescent tissue, O2 diffusion may be slowed down if the intercellular spaces become filled with cellular solution that anaerobic conditions develop within tissues. The rate of gas movement depends on the properties of gas molecule and the physical properties of the barriers (thickness, density etc.). Solubility and diffusivity of each gas are important for its diffusion across barrier. CO2 moves more readily than O2, while diffusion rate of C2H4 and CO2 are similar. Internal concentration of CO2 and O2 in plant organs depend upon the maturity stage at harvest, the current organ temperature, the composition of external atmosphere and any additional barrier. Maturity stage influences the dermal system that effects gas diffusion. Increased temperature results raised rate of respiration as a result internal CO2 level increases as the O2 level decreases. If all other factors are held constant and the movement in the gas concentrations is the driving force for diffusion, then the concentration of O2 and CO2 within the tissue will fluctuate according to the fluctuation in the external atmosphere. Methods to Alter rates of Gas Exchange There are three types of barriers to gas exchange that affect the postharvest handling of fresh produce (Fig. 1). These are (i) the structure of the dermal system such as thickness of cuticle, number and distribution of stomata and breaks in epidermis etc. Resistance to gas diffusion can be increased by adding barrier such as wax coating or covering produce with polymeric films. (ii) The package in which the commodity is shipped can be additional barrier to gas diffusion. (iii) The degree of gas tightness of the transit vehicle or storage room will also affect gas exchange with outside air. Schematic model of a commodity and its environment with three levels of gas exchange: B1=structure of dermal system and added barriers (waxing and film wrapping), B2= Permeability of package to gas diffusion, and B3 = gas tightness of the storage room Source: (Kader Saltveit, 2003) Ficks first law of diffusion states that the movement or flux of a gas in or out of a plant tissue depends on the concentration gradient across the barrier involved, the surface area of the barrier and the resistance of the barrier to the diffusion. Ficks law can be written as follows: J = A. ΆC/R Where J =Total flux of gas to be diffused (cm3.s-1) ΆC= Concentration gradient across the barrier A=the surface area of the barrier R= Resistance to diffusion If the production or consumption rate of the gas by the organ and the concentration of the gas in the internal and external atmosphere is known, then the resistance is calculated as follows: R = Concentration gradient/ Production or consumption rate Different harvested fruits and vegetables have different rates of respiration; some respire at a faster rate (more perishable), while some respire at a relatively slow rate (less perishable vegetables) (Table 1). Table 1: Classification of Sample Horticultural Commodities According to Respiration Rates (Wilson, 1999). Respiration Rates Types of Fruits and Vegetables Very Low Dried fruit and nuts Low Apples, garlic, grapes, onions, potatoes (mature), sweet potatoes Moderate Apricots, cabbages, carrots, figs (fresh), lettuce, nectarines, peaches, pears, peppers, plums, potatoes (immature), tomatoes High Artichokes, Brussels sprouts, cut flowers, green onions, snap beans Extremely High Asparagus, broccoli, mushrooms, peas, sweet corn The process of respiration is very important during ripening of fruit. In general there is an inverse relation between the rate of respiration and the postharvest life of fruit. Postharvest produce are classified according to their respiration rate as climacteric or non- climacteric. The rate of respiration increases in climacteric fruits during ripening while non-climacteric fruit shows no change in their low CO2 and ethylene production rates during ripening (Kader, 2002). If prevention or decrease in respiration is achieved, this will prolong post-harvest storage life. Ethylene causes the increase in respiration, so decreasing ethylene is also a strategy used to increase post-harvest storage life. Factors affecting respiration rate Environmental Factors Temperature Temperature is important environmental factor in the postharvest life of fresh produce due to its outstanding effect on rates of biological reactions, including respiration. Within the physiological temperature range, the velocity of biological reaction increases two to threefold for every 10  °C rise in temperature (Vant Hoff rule). The ratio of reaction rates at two dissimilar temperatures is called the temperature coefficient (Q10) if the interval between the two temperatures is 10oC. If the temperature interval of Q10 is not exactly 10o C then it can be determined by the following equation: Q10 = (R2/ R1) 10/T2-T1 Where R2 = rate of respiration at T2 R1 = rate of respiration at T1 T1 and T2 = temperature in  °C Scientists have found that Q10 is not constant for most biological processes over a wide range of physiological temperatures. Usually Q10 ranges from 1 to 5, although higher value may occur. For most biological reaction the Q10 is between 2 and 3 for temperature between 10 to 30  °C that means the reaction rate will be double or triple with every 10  °C increase. O2 and CO2 Concentration Practically, respiration can be controlled by either increasing carbon dioxide or decreasing oxygen. Decrease in oxygen near to zero is not desirable, though the O2 concentration reduces below that in air (20.9%) and especially below 10%, a significant reduction in respiration rate is observed (Gorny, 2001). However when O2 concentration drops to less than 2 %, anaerobic respiration rate become predominant and CO2 production increases. (Figure 2) (Kader Saltveit, 2003). Ethylene Concentration Exposure of climacteric tissues during their pre-climacteric stage to ethylene raises the rate of respiration. Once the respiration rise has begun, the endogenous rate of ethylene production increases and the internal ethylene concentration also increases, reaching levels that saturate its biological activity. However, unlike the case in climacteric tissues in non-climacteric tissues endogenous ethylene production remains unaffected (Kader Saltveit, 2003). Internal factors Type of Commodity Fruits and vegetables vary greatly in their respiration rate (Table. 1). Differences among plant parts and in the nature of their surface coatings (e.g. cuticle thickness, stomata, lenticels) influence their rate of diffusion characteristic and consequently their respiration rates. Stage of development at Harvest The respiration rate is usually high at early stages of development and decreases as plant organs mature. Thus fruits and vegetables harvested during the active growth phase have high respiration rates. Chemical Composition Respiration rate decreases with a decrease in water content of the tissue. The value of Respiration Quotient (RQ) is usually controlled by the rate of utilization of carbohydrates, proteins, lipids etc. ETHYLENE PRODUCTION Ethylene (C2H4) is a gaseous hormone produced from bacteria, fungi and all parts of higher plants such as shoots, flowers, seeds, leaves, roots, and fruits (Pech et al., 2003). It is a flammable and colourless gaseous compound (Arshad Frankenberger, 2002). Being a ripening hormone ethylene play a very important role in the postharvest life of many horticultural products, like increasing senescence speed and reducing shelf life but beneficially it improves the quality of the fruit and vegetables by manipulating uniform ripening process (Reid, 2002, p. 149). Because of the enormous influence of ethylene on the physiological development and postharvest life of fruits and vegetables, its biosynthesis, action, and control have been intensively investigated (Reid, 2002; Pech et al., 2003). The biosynthetic process of ethylene is usually completed in three major steps. The ethylene biosynthetic pathway is given in the figure 3. Step I: The biosynthesis of ethylene hormone is started by the conversion of Methionine (MET) to S-adenosyl-L-methionine (SAM) by the enzyme methionine adenosyltransferase (Pech et al., 2003). However, methionine adenosyltransferase is thought to consider as a rate limiting enzyme in ethylene biosynthesis because formation of SAM depends on the activity of this enzyme and SAM levels may indeed regulate ethylene production. Therefore, the sensitivity or importance of methionine adenosyltransferase to SAM implies that this enzyme may play a regulatory role in ethylene biosynthesis (Arshad Frankenberger, 2002, p. 13). Step II: SAM is consequently converted to 1-aminocyclopropane-1-carboxylic-acid (ACC) by a pyridoxal enzyme ACC synthase (ACS) (Figure 1). Actually, before the discovery of ACC, as intermediate, immediate precursor in MET dependent ethylene production process, the ethylene biosynthetic pathway was intangible (Arshad Frankenberger, 2002, pp. 11-50). The conversion of SAM to ACC by ACS is another rate-limiting step in the biosynthetic pathway of ethylene. ACS is a cytosolic enzyme (found in the cytoplasm of plants) (Paliyath Murr, 2008b) and its activity is strongly inhibited by aminoethoxyvinylglycine (AVG) (a competitive inhibitor) and aminoisobutyric acid (AIB) (an inhibitor of pyridoxal phosphate-mediated enzyme reactions) (Arshad Frankenberger, 2002, pp. 11-50). Moreover, the activity of ACC synthase is also influenced by factors such as fruit ripening, senescence, auxin levels, physical stresses, and chilling injury. The synthesis of this enzyme increases with an increase in the level of auxins, indole acetic acid (IAA) and cytokinins (Wills et al., 1998, p. 42). Step III: At last the ACC converts into ethylene by the action of ACC oxidase (known as ethylene forming enzyme or EFE) (Arshad Frankenberger, 2002, pp. 11-50; Pech et al., 2003). However, ACC oxidase is a bi-substrate enzyme as it requires both oxygen and ACC. Moreover, this enzyme also requires Fe2+, ascorbate and CO2 for its activity. Activity of ACC oxidase is inhibited by cobalt ions, and temperatures higher that 35oC (Wills et al., 1998, p. 42). The sub cellular position of ACC oxidase is still a point of controversy because there is a large number of data is available showing that this enzyme is associated with plasma-membrane or with apoplast or tonoplast. The activity of this enzyme (ACC oxidase) has been studied in many horticultural crops like melon, avocado, apple, winter squash, pear and banana. The activity of ACC oxidase is not highly regulated as ACS. It is constituted in most  vegetative tissues and it is induced during fruit ripening, wounding, senescence and fungal  eli citors (Arshad Frankenberger, 2002, pp. 11-50). In fruits and vegetables several metabolic reactions starts after harvesting. In most cases, an increase in biosynthesis of gaseous hormone like ethylene serves as the physiological indication for the ripening process. During ripening process, in some fruits large amount of ethylene is produced which is usually referred as autocatalytic ethylene production response. However, fruits are divided into two main categories on the basis of ethylene production, i.e. climacteric (those produce large amount of ethylene) and non-climacteric fruits (those produce smaller amount of ethylene). In climacteric fruits like apple, pear, banana, tomato and avocado, ethylene production usually ranges from 30-500 ppm/(kgh) during ripening. While non-climacteric fruits like orange, lemon, strawberry and pineapple, produce 0.1-0.5ppm/(kgh) of ethylene (Paliyath Murr, 2008) (Table 2). Therefore application of even a very low concentration of ethylene (0.1-1.0 ÃŽÂ ¼L/L) is sufficient enough to accelerat e full ripening of climacteric fruits; however, the magnitude of the climacteric rise is not dependent on the amount of ethylene treatment. On the contrary, application of ethylene causes a temporary rise in the rate of respiration of non-climacteric fruits and the degree of increase depend upon the amount of ethylene (Wills et al., 1998). Moreover, the difference in the respiratory patterns of climacteric and non-climacteric fruits is associated with the different behaviour in terms of the production and response to ethylene gas (Burton, 1982). The increase in respiration, as influenced by ethylene application, may happen several times in non-climacteric fruits, but only once in climacteric fruits (Wills et al., 1998). Indeed, ethylene is produced by all parts of the plant but the magnitude of ethylene production varies from organ to organ and also depends on the stage and type of growth and developmental process. In fact, recent ethylene based research findings have increased the understanding of biosynthetic pathways and enzymes involved in ethylene production, as well as the development of several ways to manipulate ethylene production e.g. by genetic alteration of plants (Arshad Frankenberger, 2002). Ethylene is produced by various plant parts growing under normal conditions however, any kind of biological, chemical or physical stress (e.g. wounding) strongly promotes endogenous ethylene synthesis by plants. Among stress induced ethylene production, pre-harvest deficit irrigation is one of the most important factor causing higher ethylene production rates in fruits like avocado (Adato Gazit, 1974) and tomato (Pulupol et al., 1996). REGULATION OF ETHYLENE BIOSYNTHESIS In plants, ethylene itself stimulates the ability of the tissue to convert ACC into ethylene, which is also regarded as phenomenon of auto-regulation. In ripening fruits, regulation of ethylene biosynthesis is a characteristic feature and is triggered by the exposure to exogenous ethylene by the activation of ACC synthase and/or ACC oxidase (Arshad Frankenberger, 2002, pp. 25-27). On the other hand, sometimes ethylene inhibits its own synthesis, as negative feedback has already been recognised in a number of fruits and vegetable tissues. In such cases, exogenous ethylene significantly inhibits the production of endogenous ethylene, induced by ripening, wounding and/or treatment with auxins. Moreover, this auto inhibitory effect seems more directed towards limited availability of ACC in the presence of AVG, an inhibitor of ACC synthase (Arshad Frankenberger, 2002, pp. 25-27). Scientists have also revealed that the inhibition or negative regulation of ethylene synthesis is the result of activity of a gene, E8 whose expression leads to the inhibition of ethylene production in tomatoes (Arshad Frankenberger, 2002, pp. 25-27). MECHANISM OF ACTION The response of ethylene action can be classified into two categories namely concentration response and sensitivity response. The concentration response involves the changes in concentration of cellular ethylene while the sensitive response involves the increase in tissue sensitivity to ethylene. Moreover, both of these responses involve the binding of ethylene to some components of the cell to mediate the physiological effects (Arshad Frankenberger, 2002, pp. 28-36). Wills et al. (1998, pp. 42-45) likewise explained that plant hormones control the physiological processes by binding to specific plant or fruit receptor sites, which trigger the succession of events leading to visible responses. In the absence of ethylene, these receptor sites are active, allowing the growth of plant and fruit to proceed. During fruit ripening, ethylene is produced naturally or, if it is artificially introduced in a ripening room, it binds with the receptor and inactivates it, resulting in a series of events like ripening or healing of injuries in plant organs. Ethylene action can be controlled through modification of the amount of receptors or through disruption of the binding of ethylene to its receptors. Binding of ethylene is believed to be reversible at a site which contains metal like copper, zinc, or iron (Burg Burg, 1965, as cited in Burton, 1982). The affinity of receptor for ethylene is high in the presence of oxygen and decreases with carbon dioxide. Changes in the pattern of ethylene production rates and the internal concentrations of ethylene associated with the onset of ripening have been studied in various climacteric fruits. For instance, tomato and honeydew melon exhibited a rise in ethylene concentration prior to the onset of ripening, determined as the initial increase in respiration rate. On the other hand, apple and mango did not show any increase in ethylene concentration before the increase in respiration (Wills et al., 1998, pp. 42-45). Ripening has been associated with senescence as it leads to the breakdown of the cellular integrity of the tissue. It is part of the genetically programmed phase in the development of plant tissue with altered nucleic acid and protein synthesis occurring during the onset of the respiratory climacteric resulting in new or enhanced biochemical reactions operating in a coordinated manner (Wills et al., 2007, p. 40). These concepts confirm the known degradative and synthetic capacities of fruit during the ripening process. The ability of ethylene hormone to initiate biochemical and physiological events leads to the theory that ethylene action is regulated at the level of gene expression (Pech et al., 2003; Wills et al., 1998, pp. 45-46). TRANSPIRATION/ WATER LOSS Plants depend more on the availability of water than any other single environmental factor (Kramer and Boyer, 1995). Water loss is very important in determining the shelf life and quality of harvested plant organs. As long as the harvested produce retains water, it remains fresh. Transpiration is one of the main processes that affect postharvest life of the fruit (Ben-Yehoshua Rodov, 2003) Most fresh produce contains from 65 to 95 percent water when harvested. Within growing plants there is a constant flow of water. Fresh produce continues to lose water after harvest, but contrary to the growing plant it cannot replace lost water from the soil and so must use up its water content remaining at harvest (Gustavo et al., 2003). This loss of water from fresh produce after harvest is a serious problem, causing shrinkage and loss of weight. When the harvested produce loses 5 or 10 percent of its fresh weight, it begins to wilt and soon becomes unusable. To extend the usable life of produce, its rate of water loss must be as low as possible (Wilson et al., 1995). Although temperature is the prime concern in the storage of fruits and vegetables, relative humidity is also important. The relative humidity of the storage unit directly affects water loss in produce. Water loss means salable weight loss and reduced profit (Wilson et al., 1995). Transpiration of fresh fruits is a mass transfer process in which water vapor moves from surface of the plant organ to the surrounding air. Ficks law of mass transfer explains this process as follows: J = (Pi-Pa) At / (RDT)r Where Pi and Pa are the partial gas pressures in intercellular spaces and in the ambient atmosphere respectively; At is surface area of fruit; RD is the gas constant per unit mass; T is the absolute temperature; r is the resistance; and J is the gas flux. According to Ficks law, the movement of any gas in or out of the plant tissue is directly proportion to the partial pressure gradient (Pi-Pa) across the barrier involved and the surface area of the barrier and is inversely proportion to the barrier to diffusion. Therefore the driving force of transpiration is the difference of water vapor pressure (WVP) between the tissue and the surrounding air. While the water vapor pressure deficit (VPD) of the air is difference between the WVP of air and that of saturated air at the same temperature. Relative Humidity is the most popular term for expressing the water content of air. It can be defined as the ration of actual WVP in the air to the saturation WVP at a given temperature. Water loss depends on the difference between the water vapour pressure inside the fruit and the pressure of water vapour in the air. To control water loss in fresh produce as low as possible, it must be kept in a moist atmosphere. Air movement also plays a vital role in the water loss from the fresh produce. Water loss is directly proportion to the air movement in the surrounding. Though air movement through produce is also indispensable to remove the heat of respiration, but the rate of movement must be kept as low as possible (Gustavo et al., 2003). ROUTES OF WATER TRANSMISSION As the harvested fruits and vegetables are detached from plant, the xylem vessels are blocked with air and their operation is stopped (Burton, 1982). Therefore, water has to use different routes to move through the tissue. Following are the major potential pathways for water movement in harvested produce. Symplast The cytoplasm of connected cells is interconnected by plasmodesmata, filled with protoplasm and lined with the plasmalemma. Therefore symplast is formed throughout the interior of a plant organ. Water and dissolved solutes move through the symplast system from cell to cell by diffusion (Ben-Yehoshua Rodov, 2003). Apoplast The cell wall surrounding symplast also form a continuous system, termed as apoplast. The apoplas provide an alternative avenue for liquid water movement by hydrostatic pressure through the interfibrillar spaces in the cell wall (Woods, 1990). Intercellular Atmosphere The plant also contains a system of intercellular gas-filled spaces that form a continuous network and serve as main pathway for O2 and CO2 transport. This field of air space provide adequate gas exchange in bulky organs (Ben-Yehoshua.S, 1969). MAJOR EVAPORATION SITE: COMMODITY SURFACE There are three major routes for moisture loss from harvested commodities to the atmosphere: (a) through outer layer that forms a surface for evaporation (cuticle and epicuticle wax; periderm) resistance for water movement through (b) the apertures in the surface connecting the internal and external atmosphere (stomata, lenticels) and (c) through the stem scars or pedicel. Cuticle and Epicuticular wax This layer, which lines all interfaces between the plant and the atmosphere, protects the plant from its relative dry environment. Resistance to water movement is derived from cuticular layer (Ben- Yehoshua, 1969; (Burg Burg, 2006). The cuticle cosntains a matrix of cellulose, polyuronic acids, proteins and phenolic compounds. These are combined with variation of amount of waxes embedded over its surface (Kolattukudy, 1980). Permiability to water usually depends more on amount of waxes than on the thickness of cuticle (Kramer Boyer, 1995). Periderm Periderm is a corky peripheral tissue. This tissue consists of several layers of cells that become corky as a result of deposition of waxes on their cell walls, and they lose their living contents. The periderm is not readily permeable to water and is permeable to gases only through lenticular pores, which replace the stomata of the original epidermis. About 97% of the total water lost from the potato tubers migrates through cell walls to the periderm, where it evaporates (Burton, 1982). Trichomes and Hairs Unicellular or multicellular projections develop on the epidermis of all parts of plants. Their exact function is still vague, but they are considered to reduce water loss (Cutter, 1976). The presence of trichomes can decrease the driving force of transpiration by reducing the surface temperature and increasing the boundary layer resistance. Stomata Before harvest, most of the evaporation occurs from undersides of leaves via stomatal guard cells and adjacent cells (Kramer and Boyer, 1995). Stomata occur in many fruits at early stages of development, but sometimes they are not found in mature fruits of some species, for example, in the grape berry (Possingham et al., 1967). Orange has greatest stomatal density reported so far for any fleshy fruit (Banks, 1995). Stomata usually function less effectively in mature fruit (Blanke and Leyhe, 1988). In most cases it is reduced with maturation and usually of minor importance for fruit water loss during postharvest period (Ben-Yehoshua Rodov, 2003).

A Memorable Experience In Photography :: essays research papers fc

A Memorable Experience in Photography To experience photography, one must have a certain style of photographs to really appreciate or admire. Photographs are picturesque images and views that really catch the interest of the photographer. For me to experience and admire photography, it took me only one photographer to really appreciate the power it has his name is Robert Capa. Robert grew up in Hungary he experienced the political unrest and turmoil. He lived under the oppression of Horthy and knew the kind of anarchy that constitutes war(Images of War 8). Robert's work represented 3 categories: 1. Images of battle. 2. Images of the effects of war. 3. Images of calamity(Photographs,Introduction). His work also had a swift understanding and sympathy for the people who suffer from being caught in war. This type of suffering made it impossible for him to ignore the events which affected their lives(Images of War 9). Robert's belief on photography is "If your pictures are not good enough, your not close enough"(Photographs Foreword). Robert's breakthrough in the field of photography came during the Spanish Civil War. His most famous picture was a snapshot of a courageous man in the act of falling(Capa18). His own special talents and course of world happenings, led him into a role as a professional photographer of war(Images of War20). To really admire and understand Capa, you must have a fascination for dramatic and emotional pictures of war. There probably has been thousands who admire the work he does. Well you can include me in that group of thousands. Capa puts into perspective in just one photograph, something my grandfather will never forget. The Bombing of Pearl Harbor. The photograph that brings back these memories is taken somewhere in Europe during World War II. It's a photograph that has the air full of scores of Japanese warplanes. They are flying over war stricken farmland. As an American citizen, this photograph brings a lot of emotions through me and would have brought greater emotions to my grandfather. I used this photograph because it brings back the memory of my grandfather telling me the story of how he survived that tragic day. On December 7, 1941, my grandfather was stationed at Pearl Harbor as a airplane mechanic. It was still early in the morning and he was still sleeping. Then out of nowhere he heard numerous explosions and then the sirens went off._ _He rushed out of bed and ran upstairs to see what was happening. In the sky he saw scores of Japanese airplanes flying and bombing the area. Some of the airplanes would risk their own lives to do more damage to the ships and the