Photosynthesis and Cellular Respiration

Photosynthesis and Cellular Respiration Photosynthesis and aerobic respiration are both part of a cyclic process of biochemical reactions. Photosynthesis requires the products of aerobic respiration (carbon dioxide and water), while aerobic respiration requires the products of photosynthesis (glucose and oxygen). Together, these reactions are involved in how cells make and store energy. The energy transfers in both processes and in how the gas exchange between oxygen and carbon dioxide occurs and the end products that result from each process are somewhat opposite processes, thus aerobic respiration and photosynthesis are in some ways complete opposites of each other. Photosynthetic organisms such as plants use solar energy to reduce carbon dioxide into carbohydrates. During respiration glucose is oxidised back to carbon dioxide, in the process, releasing energy that is captured in the bonds of ATP. Although these two energy producing processes differ in their uses and also their goals, they do have several similarities. Photosynthesis is a chemical process that takes place in the presence of sunlight, wherein plants manufacture their food and build stores of energy. This phenomenon occurs in chlorophyll containing plant cells. Chlorophyll is a pigment found in plant leaves that gives the plant its green colour. Chlorophyll absorbs the light energy and utilises it to produce carbohydrates from carbon dioxide and water. These carbohydrates produced are used by the plants as a source of immediate energy for growth, reproduction, and absorption of nutrients. The chemical reaction produces oxygen which is released into the atmosphere. Photosynthesis can be summed up by the following equation 6CO2 + 6H20 + Sunlight à ¯Ã†â€™Ã‚  C6H1206 + 6O2, (fig1 below illustrates the process of photosynthesis) Occurring in the chloroplast light reaction converts solar energy to chemical energy of ATP and NADPH.The light reactions use the solar power of photons absorbed by Photosystem I and II. These are light gathering antennas containing the chlorophyll primarily responsible for absorbing the light. Electrons are also carried from Photosystem I and II via NADPH to the Calvin cycle. The Calvin cycle uses ATP NADPH to convert CO2 to sugar.CO2 enters the cycle leaves as sugar. The sugar product of the Calvin cycle is not glucose but a 3 carbon sugar called 3-Phosphoglycerate. This 3- Phosphoglycerate with the addition of another phosphate group from ATP forms glyceraldehyde-3-phosphate .In order for one of these G3P molecules to be synthesised the cycle must take place 3 times, fixing 3 molecules of CO2.There are 3 phases of the Calvin cycle, the carbon fixation phase, the carbon reduction phase and the regeneration phase. Cellular respiration is the process of oxidising food molecules or breaking down chemical bonds of glucose into carbon dioxide and water. The energy released in the process is trapped in the form of ATP and used by different energy consuming activities of the cell. It is a set of metabolic reactions that unlike photosynthesis which occurs in the chloroplast, cellular respiration occurs in the mitochondria. The complete breakdown of glucose into carbon dioxide and water involves two major steps: glycolysis and aerobic respiration. Glycolysis is the anaerobic catabolism of glucose that occurs in all the cells and produces two molecules of ATP. Aerobic respiration is the process in which the pyruvate molecules produced by glycolysis undergoes further breakdown in the presence of oxygen and generates thirty four molecules of ATP. This reaction can be described as follows: C6H1206 + 602 à ¯Ã†â€™Ã‚  6CO2 + 6H2O + Energy (38 ATP)(fig2 below illustrates cellular respiration) Cellular respiration beginning here with glycolysis catabolises glucose into 2 molecules of pyruvate. The net yield from glycolysis is 2 ATP 2 NADH per glucose. Electrons are carried from here to the electron transport chain via NADH. Pyruvate enters the mitochondrion where it gets modified to Acetyl COA. This then enters the Krebs cycle. The Krebs cycle completes the oxidation of the organic fuel to CO2.Electrons produced here are carried via NADH FADH2 to the electron transport chain oxidative phosphorylation. In the Krebs cycle a further 2 ATP is produced. Once there has been a sufficient energy shuttle of NADH from glycolysis, a maximum yield of 34 ATP is produced by oxidative phosphorylation. This then gives a maximum of 38 ATP produced. Photosynthesis is a reduction-oxidation reaction, just like respiration. In respiration energy is released from sugars when electrons associated with hydrogen are transported to oxygen (the electron acceptor), and water is formed as a by-product.   The mitochondria use the energy released in this oxidation in order to synthesize ATP.  In photosynthesis, the electron flow is reversed, the water is split (not formed), and the electrons are transferred from the water to CO2 and in the process the energy is used to reduce the CO2 into sugar. In respiration the energy yield is 686 kcal per mole of glucose oxidized to CO2, while photosynthesis requires 686 kcal of energy to boost the electrons from the water to their high-energy perches in the reduced sugar light provides this energy. Outlined above are the main differences between the two processes. However, photosynthesis and cellular respiration are two processes that both involve electron transport chains and they both affect conc entrations of carbon dioxide and oxygen in the atmosphere. Both photosynthesis and cellular respiration provide energy to the organisms cells. It is interesting to note the structural similarities between Chlorophyll, that plays an important role in photosynthesis and Haemoglobin that is involved in cellular respiration. Both structures are practically identical except for the fact that haemoglobin has a central Iron atom and chlorophyll possesses a central Magnesium atom. Haemoglobin is a protein that carries oxygen in the blood. Where chlorophyll is known for its green pigment, haemoglobin is known for its deep red pigment. (Fig3 illustrates structural  Similarities). Both photosynthesis and respiration are also similar in that they both undergo chemiosmosis.Chloroplasts and mitochondria generate ATP by this same basic mechanism. In both kinds of organelles ,electron transport chains pump protons (H+)across a membrane from a region of low H+ concentration to an area of high H+ concentration. The protons then diffuse back across the membrane through ATP syntheses, driving the synthesis of ATP. To conclude from this, photosynthesis and cellular respiration are the most vital biochemical pathways to life. They both include cycles, stages and many enzymes to function. Although their similarities can be easily recognised, it is their differences that make them stand apart as opposite processes. Photosynthesis requiring light in order to produce its end product, carbohydrate, and cellular respiration requiring carbohydrate in order to produce its end product energy.

Jacob Lawrence :: essays research papers

Jacob Lawrence has painted figurative and narrative pictures of the black community and black history for more than 60 years in a consistent modernist style, using expressive, strong design and flat areas of color. Jacob Lawrence was a great artist. During Harlem Renaissance, he helped establish African American artists. He gave lectures at Washington University, and he enjoyed working with students of all ages. Jacob Lawrence was born in Atlantic City on September 7, 1917. His parents Jacob Armstead Lawrence and Rose Lee were part of the Great Migration of Black Americans (1916-1930). One million people left the rural South for the urban North during this period. He moved with his family for Easton, Pennsylvania. After his parents separated, he moved with his mother to Philadelphia. In 1927, his mother moved to New York and placed Lawrence and his siblings in foster homes. In 1930, Lawrence, age 13, and his brother and sister moved to Harlem to live with his mother. During Lawrence’s childhood, his family was forced to relocate many times as his parents looked for work. Steady jobs were hard to find, especially for African Americans. Racial prejudice prevented them from pursuing certain jobs or professions. Harlem was a crowded, teeming place, and the public school Lawrence attended was considered among the roughest in the area. But Harlem in the 1930s was also the center of what became known as the Harlem Renaissance. To keep her son out of trouble Rose Lawrence enrolled him in an after-school arts and crafts program at a local community center. It was taught by a young African American artist named Charles Alston. Alston liked the serious, quiet Lawrence and made sure he had lots of materials for his efforts. He found that drawing geometric designs in bright colors satisfied him greatly. He soon moved on to elaborate patterns and developed his own method of painting in which particular shapes were rendered in corresponding colors, one at a time. Lawrence continued in this mode through much of his career. The notable consistency of color is apparent in the artist’s later series of story panels. Lawrence got many of his ideas from the books and magazines he found at the center where the classes were held. Lawrence had Alston show him how to mix paper-mache, and he went on to create many colorful, life-size masks. He also used cardboard boxes to fashion three-sided scenes, depicting locales in Harlem- stores, barbershops, houses and newsstands.

Economics & study Essay

Economics is the study of how individuals use scarce resources to satisfy their needs (Lee, et al). There are a number of concepts that are associated in learning economics. These include limited resources, opportunity cost and trade-offs among many other factors of consideration. To understand and be able to make wise decisions in the purchasing of any good and service, one should better understand these concepts of economics. They are also imperative in the production of goods and services which is the primary aim of studying economics (Salaman, 1). Money and time are resources that are finite (Lee, et al). They are therefore called limited resources. A scarce resource is a resource that has a high demand and therefore proper decision making is needed to ensure that they are used optimally. Economics involves the distribution of resources so that they can satisfy individual needs. Money is scarce because it is limited in supply and therefore it should be used wisely to satisfy human needs (Lee, et al). For instance, if an individual has $ 500 in the pocket, he will choose to pay for his rent rather than buying beer for himself. Time on the other hand is an economic resource and one needs to decide well on what to do at a certain time and what to do at other times. In our daily lives, we often make decisions that impact the purchase of goods and services. These decisions depend on what our needs are and what are the resources that are at our proposal. Making decisions in economics is a very vital stage when it comes to purchasing of goods and services (Salaman, 1). An individual should make a decision that he or she will not regret when the scarce economic resource runs out. To make a good decision, one should really understand some concepts in economics like the price theory. Price theory makes one understand the prices of commodities that are in the market. When one understands the price theory, he or she can make the correct decision on what to buy at what price without incurring many losses. Opportunity cost results after careful decision making (Lee, et al). It is the cost which is equivalent to the value of the best alternative that an individual sacrifices in doing something else. By making a choice in whatever an individual does in life, he or she must incur opportunity cost. It can either be a marginal benefit or a marginal cost. For instance, an individual may have choices of either joining a masters program or getting employed in a company paying him $ 100,000. If the person decides to go for the masters program, his opportunity cost will be $ 100,000. Marginal benefit is defined as the benefit that is got by adding one extra unit in the level of activity (Lee, et al). Marginal cost on the other hand is the extra cost incurred by adding an extra unit in the level of activity. Generally, since all consumers are assumed to be rational, they tend to minimize marginal costs and maximize marginal benefits. The difference between the two gives the net benefit. Trade-offs on the other hand is closely related to opportunity cost although it reallocates the amount of time or money to be spent (Cage). This implies that there is that money that is set aside for spending on maybe house expenses. By buying less of what is not necessarily important and buying more of what is necessary, one shall have incurred a trade-off. It involves reallocation of money or time from what had been planned on (Cage). In conclusion, the study of economics helps individuals to determine on the type of choices they are to make in their daily lives. Deciding on what good or service to purchase may call for one to understand the concepts of opportunist cost, trade-offs and most importantly, have the knowledge of the scarce resources that are available to him or her. Works Cited: Cage, Michael. The differentiation trade-off and marketing to values. 2010. Web July 14, 2010 from http://www. entrepreneurslife. com/thoughts/entry/the-differentiation-trade-off-and- marketing-to-values/ Lee, Kylen, et al. The scope and methods of economics. September 17 2006. Web: July 14, 2010 from http://www. econguru. com/introduction_to_economics/scope-method. html Salaman, Graeme. Decision making for business: A reader. London: SAGE Publication Ltd, 2002.

Progeny and Other Offspring

Progeny and Other Offspring Progeny and Other Offspring Progeny and Other Offspring By Maeve Maddox A reader asks for clarification: Please tell me under which situation I use the word progeny and where to use  offspring, with examples. English is blessed with numerous words to refer to the product of sexual union; progeny and offspring are only two of them. The gen in progeny, like the gen in genital, goes back to a Latin word for beget. Progeny, therefore, is a good all-purpose word to describe people, plants, and animals that are the product of sexual reproduction. Offspring is not so literal a word as progeny; it combines the verb spring with the adverb off. Offspring are what â€Å"jump off† from the parent. It has a friendlier, less formal connotation than progeny. Compare, for example, Mr. and Mrs. Gilbreth brought up their progeny according to strict ideas of efficiency. Mr. and Mrs. Gilbreth treated their offspring to a day at the beach. Here’s a list of synonyms that are or have been used with the meaning of progeny: babies brood children descendants family fruit of one’s loins fruit of one’s womb heirs issue offspring posterity progeny scions seed sons and daughters successors spawn young Like all synonyms, these words have different connotations. We speak of babies, children, family, and sons and daughters when we are talking about people in general. In matters of law, the words heirs and issue are used with specific legal meaning. A man’s children are called issue, usually in the sense of children who have a legal right to inherit. An heir is the person entitled by law to succeed another â€Å"in the enjoyment of property or rank.† Prince Charles is referred to as â€Å"heir to the British throne,† but according to the OED, legally speaking, he won’t be the heir until his mother dies: nemo est heres viventis, â€Å"nobody is a living heir.† Genealogists talk in terms of descendants. Historians speak of posterity, the people who come after those living in the present: For it has been wisely said that if the judgment of the time must be corrected by that of posterity, it is no less true that the judgment of posterity must be corrected by that of the time.† Felix Frankfurter The horticultural term scion is often used in speaking of the descendants of noble or wealthy families: Originally built by Alfred Gwynne Vanderbilt, a scion of the wealthy Vanderbilt family, the 1909 property [the Vanderbilt Grace hotel] is a vintage Newport mansion that has been restored to its former glory In gardening terms, a scion is a slip taken from a tree or other plant and used for grafting. Another gardening word, seed, is also used to mean progeny: Now to Abraham and his seed were the promises made. –Galatians 3:16. The expression â€Å"fruit of loins/womb† is familiar from the KJ translation of the Bible, as in the greeting of Mary’s cousin Elisabeth: And she [Elisabeth] spake out with a loud voice, and said, Blessed art thou among women, and blessed is the fruit of thy womb. Luke 1:42. The word brood for children has a warm, motherly connotation. Its figurative use derives from the way a hen sits on her eggs to keep them warm. Indeed, brood is cognate with Middle High German bruot, ‘heat, warmth, hatching, that which is hatched.† The only word in the list that has an out-and-out negative connotation is spawn. Literally the eggs of aquatic creatures, spawn is used figuratively as both noun and verb to suggest that the progeny spoken of is undesirable. Because spawn is frequently used to refer to demons, as in â€Å"hell-spawn† and â€Å"spawn of the devil,† the word has become popular in the world of comics and novels about the forces of good and evil. As a noun, spawn can refer to any type of progeny that may be seen as potentially as bad as the parent. As a verb, spawn is often used to mean â€Å"to create something bad†: Joblessness, poverty, crime spawn violence Delinquent Parents Spawn Teenage Criminals Suburban hazing scandals spawn new criminal offense Computers Spawn A New Criminal Breed Some journalists use negative spawn where a word like initiate or even beget would be more appropriate: Dedicated Leaders Spawn Island Cooperative Scholar’s research spawns international remembrance effort The surest way to develop an ear for connotation is to read widely from the English literary canon, a practice that is becoming less frequent among the nominally educated. Want to improve your English in five minutes a day? Get a subscription and start receiving our writing tips and exercises daily! Keep learning! Browse the Vocabulary category, check our popular posts, or choose a related post below:100 Beautiful and Ugly Words5 Brainstorming Strategies for WritersThe Difference Between "Un-" and "Dis-"

Change of Meanings Essays

Change of Meanings Essays Change of Meanings Essay Change of Meanings Essay Meaning of words I read the essay, â€Å"How Dictionaries Are Made† by S. I. Hayakawa. In it, he explains that how editors write a meaning to a word after examine many literatures. Also, he talks about how meanings of many words have changed during different centuries. I decided to see if he was right so I looked up three words and how their meanings have changed. First, I looked into the word, â€Å"flavor†. I found that around year 1300 to 1350, flavor was origins to word fetor which means an offensive smell. In Latin, it was called flatus, and it meant to blow or to breathe. Soon the word became flator in Latin. The word Flavor was first spelled in middle French and they spelled it flaour. Then the word was introduced in Middle English and they spelled flavor and the meaning of the word changed to taste of something as it is in mouth. In British flavor is spelled as flavour. Second, I looked into the word, â€Å"choice†. I found that around 1250 to 1300, it was origins to word choose. In old French it was derivative of choisir, and it meant to perceive. Later in time, in Middle English, it was called chois. And later on, it was changed to choice, and the meaning of it changed to carefully chosen. Last, I looked into word â€Å"Succeed†. In early 1325 century, in Latin it was known as succedere, and it meant to go under, follow, and prosper. In 1350, in Middle English, they called it succeden, and it meant to follow. In Late 14centruy, Middle English changed it succeed and the meaning was changed to go near to, next to and come after. In late 15 century, the word succeed meaning was changed to â€Å"turn out well†, and it’s been same ever since. In conclusion, S. I. Hayakawa was right about the changing the meanings of words. He taught me how words have meant a lot to us and how it’s been changing ever since it exist.

Legal Underpinnings of Business Law Research Paper - 1

Legal Underpinnings of Business Law - Research Paper Example The table below offers the liability of the others in different types of business entities for a breach of contract. However, if the terms of the agreement in the formation limit liability for an individual in case of a breach in contract, then it may mean all the parties will be held responsible regardless of the party who entered into a contract As a sole proprietor of Tinker’s Home Security Service, to avoid liability I will analyze the contract agreement closely and determine if in my breaching the contract, there was actual damages. If there is an actual breach that results in loss, then to limit my liability, I would seek for a mediator or any other alternative resolution method. This will avoid the cost of damages I would incur if I were found liable by a court of law. For Tinker & Tailor’s Home Security Service (general partnership), I would limit my liability by critically examining my position I played in contract negotiation. Since general partnership agreement binds all the parties regardless of the person who entered the business contract, it means my liability will be reduced since the whole enterprise will be held liable for my actions. I play innocence that I exercised all the prerogatives with pure intentions in mind. I would love to form a corporation since this is the best form a business (Cohen, 2005). The organizational form of the business will be that involving managers, employees and shareholders. As a shareholder, I will be in a position to reduce my liability since my role will be that of board meeting to deliberate of performance of the company. Similarly, I will not be responsible for losses incurred by the company, but only the managers will bear responsibility. For Tinker & Tailor’s Home Security Service (LP), I would reduce my liability by ensuring that always no general partner sign business contracts on behalf of the

Starwood Hotels and Resorts Worldwide Essay Example | Topics and Well Written Essays - 2750 words

Starwood Hotels and Resorts Worldwide - Essay Example The company owns and runs the Starwood Vacation Ownership, Inc, which provides premier world class vacation experiences through villa-style resorts and access to Starwood brands(NHS para 10). Answer to question1 The Middle East hospitality and tourism industry is one of the more robust in the world. Data released by the world travel and tourism council indicates that visitor numbers are expected to soar high in the coming five years since the Middle East region projected to grow in international visitor arrivals by 6.5%. Starwood is well placed to exploit this market especially Dubai which is gearing up to attract new sectors such as conferencing with its world class infrastructure and competitively priced hotels (NHS para 3). Starwood should leverage on the number of business visitors in the Middle East. The company should offer value added hospitality services such as conference facilities, dining facilities and tourist villas. In some instances, international brands can be introdu ced to foreign markets without much consideration for local tastes and preferences. In this case, the company can introduce its standardized product in the foreign market and exploit economies of scale in its operations, this way; it can maintain a price advantage over its competition. However, a standardized product strategy should be flexible enough to respond to local markets, the products should be designed with a more balanced strategic focus giving weight to local and global concerns. There should be an emphasis on  the global market coordination to avoid duplication of activities and to capitalize on the scope and economies of scale (NHS para 3). The company should utilize economies of scale in order to reduce the operating costs and threat of new entrants in the market. If necessary, the Starwood subsidiaries in the Middle East should be given more autonomy to tailor their products to the needs of the market. The subsidiaries can design products specifically for the Middle East market or adopt existing Starwood brands and customize them depending on local preferences. Adopting existing brands is especially important for the franchised system of management adopted by Starwood where the owner of the hotel is not the brand owner. Thus adopting an international brand gives the subsidiaries worldwide exposure and recognition associated with an established brand (NHS para 7). The company should pursue both a global strategy, but also emphasize on the customization of the hospitality services to the needs of the local market. The company should differentiate its services in order to attain competitive edge in the hospitality industry. Where global brands are adopted, teams of experienced staff should be established on the ground to modify the global campaign locally and serve as the public face of the brand. Their activities are then coordinated by a matrix structure reporting to the global brand manager or a local marketing manager. A separate team should be established, and it is responsible for new product development to fit the local market or to adopt global brands that fit into the existing Starwood portfolio. Brand strength is the life-blood of a franchising company like Starwood, and it is important that the staff develop and promote a brand culture (NHS para 5). The company has attained brand recognition and efforts should be shifted to retaining the customer loyalty through new and innovative hospitality products and loyalty