The Hair Follicle Stem Cell Niche and the Function of the Rac1 protein within the niche. Abstract: An adult stem cell’s niche is responsible for the preservation of the stem cell’s undifferentiated state through either intrinsic or extrinsic expression of specific proteins (Scadden‚ 2006). Situated in the bulge of the hair follicle‚ hair follicle stem cells (HFSC) are quiescent in nature and are responsible for not only its self renewal but also in the production of rapidly proliferating cells
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future holds. I imagine myself happy as to what I have accomplished in my life and excited to watch my family grow up. First of all‚ I hypothesize that my physical attributes such as my eye color‚ hair‚ and skin/epidermis will lose their youthful touch. This is because my skin/epidermis will lose its elasticity and its oil. As for my hair and eye color‚ the color will fade for both subjects. Although these physical attributes fade and lose their youth-like simplicity‚ my memory will be sharp. All
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another fluid. • Isotonic: ➢ Having the same (or equal) osmotic pressure and same water potential since the two solutions have an equal concentration of water molecules. MATERIALS: 1. Potato slices 2. Elodea leaf/ onion scales 3. Razor blades 4. Digital balance /string /ruler 5. Varying molar of sucrose solutions (0.01 M‚ 0.02 M‚ 0.05 M‚ 0.1 M‚ 0.3 M‚ 0.5 M) 6. Tissue papers 7. Test tubes 8. Watch glass 9. Forceps
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INTRODUCTION The enzyme catalase converts hydrogen peroxide (H2O2) to water and O2. The evolution of O2 causes bubbling. Thus‚ catalase-positive organisms that are mixed into hydrogen peroxide will cause bubbling (catalase-negative organisms will not). This test is good for distinguishing between Gram-positive cocci in chains (catalase negative) versus Gram-positive cocci in clusters (catalase positive). The coagulase test is used to differentiate Staphylococcus aureus from coagulase-negative
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Burn injury is among the most weakening traumas to humans. The rate of burns in the United States of America is estimated to be over 2 million cases per year‚ with 3‚400 deaths per year and about 250000 people are burnt each year in the United Kingdom. Of these‚ almost 112000 attend an accident and emergency department and about 210 die of their injuries. According to the World Health Organization‚ it is estimated that about 300‚000 dies worldwide each year due to burns. Burn injury causes
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In this presentation I plan to discuss a little about each of these cases as well as tell ways to prevent and treat them. The first most common skin cancer is basal cell carcinoma. This cancer develops in the basal or bottom layer of the epidermis‚ which is the top layer of the skin. The cause of this cancer is a gene called patched or PTC‚ which helps to control cell growth and development. If this gene is missing‚ defective‚ or damaged by ultra violet radiation‚ unrestrained cell proliferation
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segments also changed. Differences in tagmatisation helps to separate the major classes in phylum arthropoda 2. Jointed appendages a. Modified for specialized functions (sensory‚ food handling‚ swift movement) 3. Hard exoskeleton a. Secreted by epidermis b. Made of chitin and protein c. Flexible & allow muscle attachment d. Prevent water loss (desiccation) & protect from predators 4. Early arthropods show little variation from segment to segment. 5. Cephalothorax= head + thorax‚ abdomen 6.
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system (page 159-175) Cutaneous Membrane * Epidermis- stratified squamous epithelium i. the epidermis is dominated by keratinocytes- the body’s most abundant epithelial cells‚ forming several layers or strata ii. epidermal ridges formed by the deeper layers of the epidermis‚ extend into the dermis and dermal projections called dermal papillae‚ that project into epidermis‚ both greatly increase surface area for attachment binding epidermis to dermis iii. thin
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Experiment title: Preparation of Biological Materials for Microscopic Examination Objectives: 1. To learn how to use a microscope. 2. To study the cell structure of starch grains‚ onion cells and cheek cells. 3. To differentiate the difference between starch grains‚ onion cells and cheek cells. Introduction: Microscope is an optical instrument use to magnify micro objects that hardly or impossible to be observed by naked eyes‚ so that the objects can be studied. Compound light microscope
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Duffy Carol Ann Duffy talks of an unorthodox love in her poem “Valentine”‚ where she compares love to an onion. The narrator finds that gift givers portray love incorrectly when she mentions typical Valentine’s Day gifts. The poem is an extended metaphor of love being an onion‚ and she thinks of love as a violent emotion rather than a peaceful one. The narrator compares love to an onion in her poem "Valentine" to show that her opinion of love is unconventional‚ violent‚ negative‚ enduring emotion
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