Metabolism Studies Essays - Animal Physiology, Thermoregulation

Metabolism Studies Abstract The purpose in experimenting with computer simulations was to compare oxygen consumption rates in different mammalian subclasses. We compared monotremes, marsupials, and placental mammals at both warm and cold temperatures. The results supported our hypothesis that when temperature increased, metabolic rate decreased. This was also supported using a students t-test. We also found that placental mammals had the highest oxygen consumption rates and marsupials had the lowest. We compared oxygen consumption rates in different sized crabs at different temperatures. The results supported our hypothesis that the smaller crab would have a higher rate of consumption. However, in the crabs, as temperature was increased, metabolic rate increased also. Introduction The second law of thermodynamics affirms that all living organisms must receive a constant energy input in order to survive (Witz 2000). Almost all bodily activities require energy. It is important to study how animals obtain, process, and dispose of products needed to maintain a positive energy balance. When cellular respiration occurs in the body, heat is produced and given off into the environment by the release of potential energy contained in the chemical bonds of macronutrients. The amount of heat released into the environment and the rate at which chemical reactions occur in the cells are directly related. Two different relationships exist, one that describes the endothermic animal and one that describes the endothermic animal. The rate of heat produced by the endothermic animal while at rest, fasting, and within the thermoneutral zone is dependent upon the basal metabolic rate (BMR). The thermoneutral zone of the endotherm is described as the range of ambient temperatures wit hin which there is a limited change in metabolic rate. The standard metabolic rate is what the rate of heat loss in ectotherms relies upon. The difference between the two rates is the temperature factor. Due to that fact that the temperature of ectotherms has a wider range with ambient temperature than the endotherms, physiologists defined a different measure for the basal level of metabolism. Although it is possible to measure the animals heat lost to the environment by direct calorimetry, it is easier to use indirect calorimetry. An effective way of measuring heat loss is to use the rate of oxygen consumption. Since oxygen is required by most animal cells using biochemical pathways to metabolize macronutrients, and it varies in a predictable way, it is useful in determining metabolic rate. If we can estimate BMR accurately, we can predict the amount of energy needed for important aspects of the animals life, such as growth and reproduction. For comparative purposes in the laboratory, we will be comparing weight-specific metabolic rates. This will allow us to compare the oxygen used by a gram of rat tissue to the oxygen used by a gram of mouse or iguana tissue. We hypothesized that the metabolic rate of the ectotherms, which are the iguanas, will be lower than the metabolic rate of the endotherms, which are the rats and the mice. Computer simulated temperature differences in the environment of both endotherms and ectotherms will also cause a difference in metabolic rate. When exposed to cold temperatures, we hypothesized that the metabolic rate will be greater than when the organism is exposed to high temperatures. The animal requires a greater amount of energy to keep the body warm at low temperatures; therefore, the body must breakdown the macronutrients at a faster rate. Body size also influences metabolic rate. A smaller animal, such as a mouse, should have a greater metabolic rate than a larger animal with the same general morphology, like a rat. This difference in metabolic rate is due to the surface area to volume ratio. A smaller animal has a higher ratio and more surface area exposed to the environment; therefore, it requires more energy to maintain the positive energy balance. Students t-tests were used to compare differences in temperature and body size in endotherms and ectotherms, different mammalian subclasses, and in the crab. Methods Determining the WMR of endotherms and ectotherms- In this experiment, we found the average WMRs of a large endotherm, which was a rat, a small endotherm, which was a mouse, and an ectotherm, which was an iguana. The bottom of the metabolism chamber was covered with approximately 50

Song for my mother Essay Example

Song for my mother Essay Example Song for my mother Paper Song for my mother Paper The title of the poem makes its subject clear, a praise song or a eulogy, is a traditional form from many African cultures and is often sung instead of being written down. This poem was written to honour the attributes of the poet’s mother; it is a metaphoric poem written from the child’s perspective, using imagery to describe the powerful emotional relationship she shared with her mother. The poet is grateful and rejoices her mothers presence using the term praise in her poem title whilst referring to her homeland simultaneously. With structure, â€Å"Praise Song for My Mother† is based around the first three stanzas, each of three lines. All of which are very similar in format, although, the rhythm is not carried all the way through. The fourth begins in the same way as the first three but is extended, emphasising the poem’s final line about the daughter’s â€Å"wide futures† and expanding horizons, as if reflecting the way her mother’s care allowed her to develop and move on. â€Å"Praise Song for My Mother† is a free verse, meaning it does not adhere to regular rhyme or rhythm, writing in this way augments the fluidity and the reading of the poem. The lack of punctuation means that there is no pause, adding to the flowing pace and has a softer effect and tone on the reader. By not using rhyme and following an unconventional order, the poet creates a sincere and honest atmosphere within the piece. The consistent use of past tense and repetition, for example â€Å"You were† – secures and anchors this poem. It illustrates the certainty and unfailing trust that the poet places in her mother. The repetition is effective in reinforcing the idea of security and sanctuary created by the mother. It also signals to the reader that the poet’s mother has in fact passed away and elucidates the point of view from which it is written – as if the speaker is reminiscing and remembering her childhood, along with the influence of her mother. The first three stanzas end with a line that lists repeatedly three qualities of her mother. The first four stanzas all end with a verb (â€Å"fathoming†//â€Å"mantling†// â€Å"streaming†//â€Å"replenishing†), indicating on going action, that this adoration is constant. Nichols uses plosives, fricatives and dentals (sounds of the words) they are harsh and assertive at times, if linking this to the final line of the poem, it is possible that it hints at the writer harbouring a certain degree of bitterness towards her mother for pushing her to independence; it is clear that she enjoyed being sheltered and protected. â€Å"Water†//â€Å"Moon’s eye†//â€Å"Sunrise† are all examples of the natural references that the poem includes. This could signify a mother’s love being natural, endless and essential to her. By comparing her to various natural and beautiful things, Nichols really captures the sense of awe and admiration she holds for her mother. She describes her as â€Å"water†. Traditionally water symbolizes life, healing and cleansing. She continues to describe her mother as â€Å"deep and bold and fathoming† this only accentuates the emotions and feelings within their relationship, the confidence, courage and bravery (all features of the sea if you perceive it metaphorically), and the quality of understanding that her mother has. Her mother is also said to be the â€Å"moon’s eye† to her, this conveys how she was a guidance to Nichols during her dark moments like the moon only appearing at night. In relation to the previous stanza’s theme of water, the moon is also known to control the tide. If seen in a metaphorical sense, her mother is the moon and Nichols is the tide, being pulled towards her mother for safety and protection as suggests in the line â€Å"pull and grained and mantling†. Her mother became her strength and foundation when she needed her to be. â€Å"Sunrise† could be a metaphor demonstrating the joy and happiness that her mother brought into her life. Sunrise meaning she never set, that she never ended; she was always fresh and new. â€Å"Rise and warm and streaming†, warmth indicates a sense of comfort, rise embodies a subtle power that her mother has and streaming displays a ceaseless love. Evocative words are used to give more strength towards Nichols’ opinion on her mother and expresses how much of a important character she was in her life. And in a way, causes us, as the readers to be able to relate and in turn think of our own relationships with our parents. The fourth stanza is concentrated on food, drawing on Nichols’ Caribbean roots thus giving a more personal insight into the poem. She uses the double verb; â€Å"replenishing replenishing†, because like her natural references; the tide, water or sunrise, her mother is always there. The use of the plural form of â€Å"future† in the final line is significant. What these â€Å"futures† will contain is undefined by the mother; she has faith in her daughter hence the addition of â€Å"wide† showing that the mother knew her daughter would take advantage of all the different opportunities offered to her. And as if her parenting has been about creating possibilities, rather than deciding or controlling her daughter’s future. The main idea of â€Å"Praise Song for My Mother† is that parents – specifically mothers – are a source of nourishment and sustenance for their children, consistently providing them with the necessities in order to flourish and advance. Water, the moon and the sun are all elements that add to the timeless quality created in the relationship between mother and daughter. The keyword within the piece is â€Å"replenishing†, repeated in order to strengthen the reliability of the mother when giving everything her daughter needs to overcome obstacles and life’s numerous challenges. The celebratory and commemorative nature of the poem can be seen in the active and positive language the poet displays. She is praised over and over again for the qualities that she presents to her daughter, when helping her to adulthood. The mother is seen as an inspiration. It is not just a command to â€Å"go to your wide futures† that directs and leads the daughter into maturity but the example that her mother has set. Show preview only The above preview is unformatted text This student written piece of work is one of many that can be found in our GCSE Other Poets section.

Management Strategy and Policy Research Paper Example | Topics and Well Written Essays - 2000 words

Management Strategy and Policy - Research Paper Example The external environment can be analyzed with the aid of tools likes Porter’s Five forces. After analyzing the environment using Porter’s, effective strategies can be formulated. Also, EMAAR’s strengths, weaknesses, competition, opportunities and in particular competitive advantages, also need to be focused while coming up with strong strategies. Thus, the focus will be on strategy development in EMAAR group, starting with a background about the company, then Porter’s Five Forces analysis of its external environment, followed by the focus on its competitive advantages and finally coming up with strategies in key areas which will help it to achieve optimum competence. UAE based Emaar Properties is a Public Joint Stock Company (PJSC) focusing on property development as well as lifestyles related services. Established in 1997, it has grown to become one of the largest property developers in the whole of Middle-East Asia. (â€Å"About Emaar†). It became a PJSC in 2007, after Dubai government garnered around 32% equity stake in Emaar, by exchanging with sizable prime land. Although, its prime focus is property development, it has over 60 companies under its wings, with each company operating in different business sectors, offering varied services including in the sectors like hospitality & leisure, shopping malls, healthcare, education and financial services. (â€Å"Board of Directors†). Apart from its main operations in UAE, EMAAR has expanded geographically doing projects and offering services in many key Asian countries like Saudi Arabia, India, Syria, Pakistan, etc., African countries like Egypt, Morocco, etc., as well as United Sta tes and Canada. It has developed some of the globally well-known and prominent landmarks of UAE. The list includes Downtown Dubai, â€Å"the 500-acre mega-project, home of Burj Khalifa – the world’s tallest building which features the world’s first Armani Hotel Dubai and the world’s