from the ankle digits – the fingers and toes; note: there are four finger digits but five toe digits D. Skin – the outer covering of the head‚ truck‚ and appendages; it is smooth and moist epidermis – the outer layer of the skin containing pigment granules for coloration dermis – the skin layer under the epidermis containing chromatophores (i.e. pigment
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Practical Work Nº2: “Different methods to control osmosis” Aim: observe and test the process of osmosis through different kinds of methods: the weigh (potato)‚ the density (beetroot) and under the light microscope (onion). Hypothesis: according to the encyclopedia definition osmosis is the diffusion of a liquid (most often assumed to be water‚ but it can be any liquid solvent) through a partially-permeable membrane from a region of high solvent potential to a region of low solvent potential. Thus
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Due to the cancer originating from the lower layer of the epidermis‚ the amount of sun exposure is a major factor in getting it. Since we are constantly exposed to the sun in daily life‚ about 75-80% of skin cancers are basal cell carcinomas. As a matter of fact‚ it’s so common that one in every five Americans will
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exoskeleton also helps to regulate water loss and limit the size of insect growth. The exoskeleton is made up of a composite called chitin. Chitin is a chemical relative of glycogen and cellulose. The exoskeleton is made up of three parts called the epidermis‚ basement membrane‚ and the cuticle. The cuticle is the part of the exoskeleton where most chitin concentrations occur. Bumblebee wings are formed of the same material as the rest of the exoskeleton; bumblebees have four wings with the two rear wings
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Developmental Biology Final Exam Study Guide 12/3/11 Part I Chapter 1 -Basic Problems of developmental Biology: • Maintenance of complete genome while cells differentiate -Main mechanisms of differential gene expression-polarity and cytoplasmic differences; polarity: • Gene expression leads to a difference in cells • Every cell in body has the same genome • Gene regulation occurs: o Polarity and cell division ▪ Uneven egg contents ▪ Environmental factors
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the different types of basal cell carcinoma and the populations that are affected. Basal cell carcinoma (BCC) is a skin cancer that starts in the epidermis (Medline Plus‚ 2012). The Skin Cancer Foundation defines BCC as an “abnormal‚ uncontrolled growth or lesion that arises in the skin’s basal cells‚ which line the deepest layer of the epidermis” (2012). BCC is a significant health problem‚ with an estimated 2.8 million cases diagnosed each year (Dogan‚ 2007). It is the most common type of cancer
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PLANT CELL Introduction Plant cell is the basic unit of structure and function in nearly all plants. The range of specialization and the character of association of plant cells are very wide. In the simplest plant forms a single cell constitutes a whole organism and carries out all the life functions. In just slightly more complex forms‚ cells are associated structurally‚ but each cell appears to carry out the fundamental life functions‚ although certain ones may be specialized
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In the 1930s and 1940s‚ an inhumane form of science rose to prominence in the scientific realm under the branch of scientific testing known as animal testing (Hajar). Over the years‚ as society and science progressed‚ animal testing did as well. The use of animal testing became ubiquitous in the scientific community and utilized in a variety of industries including the medical‚ cosmetic‚ and many more. However‚ recently‚ cosmetic animal testing has been garnering a significant amount of interest
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The larva hides in its case then float on the water surface during the day and crawls to the rice plant with its case to feed. Damage • Begins in a flooded seedbed‚ larva feed by scraping patches of green tissue from young leaves‚ causing white epidermis to remain. • Ladder like appearance of removed leave tissue resulting from the back and forth motion on the head during feeding. • Maturation may be delayed 7-10 days Management Cultural control • Non-flooded seedbed • Transplanting older
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1956 who was a Scottish dermatologist. (1) Even though it is a rare but also a serious type of cutaneous adverse drug reaction. It is often characterized by widespread erythema‚ necrosis‚ and bullous detachment of the epidermis and mucous membranes. That results in exfoliation of Epidermis which leaves an exposed and inflamed dermis and therefore there is increased susceptibility to infection leading to death. Consequently‚ there is a high mortality rate of 25-35 % and considerable long-term morbidity
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