INTRODUCING WITH BIOCHEMICAL CYCLES Biochemical cycles Nutrients are important for organisms to function. Each nutrient has a role in global biogeochemical cycles. A nutrient is a chemical that organisms need to live and grow and are substances an organism’s uses for metabolism which must be taken in from its environment that enrich the organism. Two types of nutrients are macronutrients and micronutrients. Macronutrients are needed in large quantities while micronutrients are needed in smaller
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4Action of hormones in the Menstrual Cycle The Ovarian Cycle The cycle begins with the release from the hypothalamus of gonadotrophin – releasing hormone (GnRH)‚ which stimulates the pituitary to secrete small amounts of Follicle Stimulating Hormone (FSH) and Luteinising Hormone (LH). The FSH stimulates follicle growth‚ aided by LH and the cells of the growing follicles start to make estrogen. Notice in figure(d) that there is a slow rise in the amount of estrogen
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Otto Cycle When you talk about the Brayton cycle‚ gas turbine engines should come up and when you’re talking about the Otto cycle‚ piston engines should also come up. These two cycles are the backbone of power generation. The theory of the two cycles goes all the way back to the 18th century. The Name Brayton comes from the American inventor George Brayton and Otto comes from German engineer Nikolaus Otto. Both these men changed the world and how we live life now a day. The Brayton cycle was first
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Science 9 Chapter 5.1 The Cell Cycle and Mitosis Pg152-158 Notes Cell Replacement and Development -Cells continue to divide as you continue to grow. -Muscle & nerve cells usually do not continue to divide in adult. The Cell Cycle -Life of cell = divided into 3 stages called cell cycle. -Stages = Interphase‚ Mitosis and Cytokinesis -Interphase= cells carry out functions necessary for survival and cells that divide prepare for reproduction. -Mitosis divides duplicated contents of cell’s nucleus
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The business cycle is like a roller coaster and this roller coaster definitely has its dips and peaks. In the cycle there are expansionary periods‚ peaks‚ downturns‚ and troughs. Each one is part of and essential in the cycle. Like a roller coaster you will go up and reach a peak and then you will have to drop. Although just because you drop does not mean you will reach the lowest point of the ride. Just like a coaster the business cycle has its high peaks and plunging drops. So lets start the
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by which oogonia are transformed into mature oocytes • This maturation process begins before birth and is completed after puberty • Oogenesis continues to menopause‚ which is permanent cessation of the menses (bleeding associated with the menstrual cycles) 2 maturation processes of oocytes are involved; Prenatal maturation Postnatal maturation Prenatal Maturation of Oocytes • Primordial germ cells (46‚ 2N) migrate from the wall of the yolk sac and arrive in the ovary at 5th week and differentiate
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Chapter 10 (Business Cycles) Business Cycles (business Flucuations) The ups and downs in economy wide economic activities are called business cycles or busyiness fluctuations. When business fluctuations are positive they are called expansion‚ the opposite of expansion is contraction which is slow down in the pace of national economic activities. Phases of the business cycle over a several year period 1. A peak is when business activity reaches a temporary maximum with full employment and near
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commentary The boundless carbon cycle Tom J. Battin‚ Sebastiaan Luyssaert‚ Louis A. Kaplan‚ Anthony K. Aufdenkampe‚ Andreas Richter and Lars J. Tranvik The terrestrial biosphere is assumed to take up most of the carbon on land. However‚ it is becoming clear that inland waters process large amounts of organic carbon and must be considered in strategies to mitigate climate change. A tmospheric carbon dioxide concentrations increased from ~280 ppm before the industrial revolution to over 384
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Spermatogenesis Spermatogenesis is the production of the male gametes (reproductive or sex cell) otherwise known as sperm. The production of sperm takes place in the seminiferous tubules within the testes and are formed from cells by a type of cell division called mitosis and then meiosis. This process begins at puberty. Spermatogonia cells are made by mitotic division of the primordial germ cell. Mitotic cell division produces diploid cells that are identical to the Parent cell with 46 chromosomes
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The Never Ending Cycle Everyone has heard someone comment on poverty in the United States. Some people say‚ "the poor have only themselves to blame for their situation." Or‚ "why don’t they get a job?" This is the problem with society today; the different levels of the class structure have grown so far apart from one another they cannot even relate to one another. People look down on the poor as unmotivated and lazy when‚ in fact‚ it is not their fault‚ but the fault of a society that does
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