human immunodeficiency virus c) Microbial ecologist -- studies bacteria that degrade oil d) Microbial physiologist – studies fermentation of sourdough bread e) Molecular biologist – studies recombinant DNA 2) You are observing a cell through a microscope and note that it has not apparent nucleus. You conclude that it most likely a) has a peptidoglycan cell wall b) has a cellulose cell wall c) moves by pseudopods d) is part of a
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INTRODUCTION Surface modification is a miraculous application of Electric Discharge Machining (EDM). It can modify the conductive material surface by both removing material from the surface and depositing material on the surface. It can remove or deposit material from the work surface through controlled electrical sparks by the process of melting and evaporation. The controlled sparks erode material from the work and tool surface within very short intervals of time. Study of surface morphology widens
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of the Cell Key Concepts: 4.1 The cell is the basic unit of life; its organization and size are critical in maintaining homeostasis‚ and its size and shape are adapted for its function. 4.2 Biologists study cells using microscopes and biochemical techniques such as fractionation. 4.3 Unlike prokaryotic cells‚ eukaryotic cells have internal membranes that divide the cell into compartments‚ allowing cells to conduct specialized activities within
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wide range of analytical techniques with high sensitivity‚ rapid response and relatively high selectivity [1‚2]. The sensitivity can be significantly improved by introducing metal nanoparticles into the sensing interface [1‚2] to facilitate the electron transfer. Noble metals are the most researched catalysts because of their high catalytic activities in many chemical reactions [1–10]. The modification of electrode surfaces with redoxactive metal nanoparticles has led to the development of various
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EXPERIMENTAL DETAILS All chemicals used were Merck reagent grade. Solutions were formulated with chromium sulfate (Cr¬2(SO4)3.6H2O) as chromium source in the quantities presented in (Table 1); Solutions were heated to 60°C for three hours during complexation reaction as in [29]‚ and pH was adjusted to 3 units without HCl or NH3 . Table1- electrolyte and electrodeposition parameter The coatings were deposited on a 1 x 1.5 cm2 cooper plate sample. Preparation for all specimens was as follow: Firstly
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Name_______________________Period___________ Chapter 6: A Tour of the Cell Concept 6.1 Biologists use microscopes and the tools of biochemistry to study cells 1. The study of cells has been limited by their small size‚ and so they were not seen and described until 1665‚ when Robert Hooke first looked at dead cells from an oak tree. His contemporary‚ Anton van Leeuwenhoek‚ crafted lenses and with the improvements in optical aids‚ a new world was opened. Magnification and resolving power limit
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The optimal growth temperature for Glaciozyma antarctica PI12 is 12oC (Boo et al.‚ 2013). The upper temperature limit for growth is 20oC. However‚ some psychrophilic yeast such as Candida psychrophila (optimal growth temperature of 15oC) can tolerate temperature up to 25oC for three hours (Deegenaars & Watson‚ 2006). Low temperature for the growth of Glaciozyma antarctica PI12 is difficult to determine accurately. One of the factors is the technical difficulties to determine the amount of antifreeze
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INTRODUCTION Levels of organization (cell to biosphere) and characteristics of life Levels: Cells->tissue ->organs & organ systems->organisms->populations->communities->ecosystems-> biosphere Characteristics of life: Cell and Organization: Each cell can only do the job it is tasked with. Example: brain cells Energy Use and Metabolism: Energy is needed many organisms. Energy is utilized in chemical reactions Response to Environmental Changes: responds to stimuli Regulation and Homeostasis: ex:
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Report 2 Microscope and the Cell Template Student: Mavon Riley Email: shantariley@yahoo.com Date: 09/05/2014 I. Purpose of the Microscope II. The Compound Microscope EXERCISE 2.1 – Label the parts of the compound microscope 1. Eyepiece 2. Arm 3. Course Adjustment 4. Fine Adjustment 5. Revolving Nose piece 6. Objective Lenses 7. Stage Clips 8. Stage 9. Iris Diaphragm Lever 10. Condenser 11. Light Source 12. Base EXERCISE 2.2 – Calculate microscope magnification
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frequency of incident radiation affect the stopping potential or saturation current or both? (1) Q7. In an unbiased p-n junction why do holes diffuse from the p region to the n region? (1) Q8. What is noise in a communication system? (1) Q9. An electron‚ alpha particle and proton have the same kinetic energy. Which of these particles has the shortest de Broglie wavelength? (2) Q10. Is it correct to say that a
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