causes cataract. UV C Radiation About 90% of radiation of low pressure mercury discharge lamps is at 254nm and is used in disinfection of air‚ liquids‚ solids and food. The radiation may vary between 250 and 265 nm (corresponds to maximum in DNA absorption spectrum). It is very effective in germicidal action‚ against bacteria and virus. The lamps are called germicidal lamps‚ bactericidal lamps or UVC lamps. Blue
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credited to Newton who was the chief proponent of the corpuscular theory. The apparatus is set up as shown (Fig. 8.1). L is a convex lens placed on an optically flat plate of glass P‚ forming an air film of varying thickness. Light from the sodium lamp S‚ strikes a sheet of glass G‚ set at an angle such that the light is reflected downwards towards the lens and plate‚ P. Some of the amplitude is reflected at the lower convex lens surface and some at the glass plate. These two reflected rays travel
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Micro-extraction of urine and/or stomach contents and analysis by TLC Abstract Thin Layer Chromatography (TLC) is one of the oldest chromatographic techniques used for the identification of compounds and for determination of the presence of trace impurities. The aim of the experiment was to determine two unknown samples (X and Y) by comparing results to the known standard drugs‚ of which there was five‚ using a specific TLC method. The same technique was used for the determination of
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Unit 1 What is inside an atom? * A positively charged nucleus composed of protons and neutrons * Electrons that surround the nucleus What are isotopes? Isotopes are atoms with the same number of protons and different numbers of electrons How do we represent different atoms? What is specific charge? The specific charge of a particle is defined as its charge divided by its mass What keeps protons and neutrons in a nucleus together? A stable isotope has nuclei that do not disintegrate
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Argon (Ar) is a noble gas found in Group 0 on the periodic table. It gets its name because of its chemical inertness and comes from the Greek root ‘Argo‚’ which means lazy. This is because Argon doesn’t react well with other elements. The atomic number of Argon is 18 making it a member of the helium group of elements which are also called noble‚ or inert‚ gasses and are non reactive. Its electronic configuration is: 1s2 2s2 2p6 3s2 3p6 The outermost shell‚ shell number three‚ has a completely
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the device‚ releasing energy in the form of photons. This effect is called electroluminescence and the color of the light (corresponding to the energy of the photon) is determined by the energy gap of the semiconductor. LEDs are used as indicator lamps in many devices and are increasingly used for other lighting. Introduced as a practical electronic component in 1962‚ early LEDs emitted low-intensity red light‚ but modern versions are available across the visible‚ ultraviolet and infrared wavelengths
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BANANA TISSUE CULTURE INTRODUCTION Plant Tissue Culture is culturing of any part of the plant in a specially defined growth media under aseptic laboratory condition in Petri dishes‚ test tubes or in any other suitable glass containers. The plant nutrient media consists of macro and micro salts‚ vitamins and desired levels of plant growth hormones. Depending upon the plant species genetic nature and with help of above supportive media various forms of callus/embryos/shoots/ roots or direct plantlets
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displays have larger elements. The LCD screen is more energy efficient and can be disposed of more safely than a CRT. The inside of an LCD monitor basically comprises of 3 units: 1. LCD panel (the screen) 2. Backlight (a CCFL or cold cathode fluorescent light bulb) 3. Inverter (power supply unit) PROPERTIES Liquid Crystal Properties And Notebooks LCD Screens Liquid crystals are interesting because they don’t exactly fall under the three main states of matter: solid‚ liquid or gas. Liquid
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PATHOPHYSIOLOGY Age- related macular degeneration (AMD)‚ a chronic‚ progressive disorder of the retina‚ is the most common cause of blindness in individuals over the age of 60. The macula is the part of the retina which provides high resolution color vision (Redmond &While 2008). As the macula degenerates‚ individuals lose their central vision and color vision. There are two types of macular degeneration: wet‚ or choroidal neovascularization and dry‚ or nonneovascular . Dry AMD is the more
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Photosynthesis The leaves are the part of a plant where most photosynthesis takes place. If you cut a leaf in half and look at the cut end‚ it would look like this: Key: 1. Waxy cuticle: this gives the leaf a waterproof layer‚ which lets in light. 2. Upper epidermis: provides an upper surface. 3. Palisade cells: contain chloroplasts. 4. Spongy mesophyll: collection of damp‚ loosely packed cells. 5. Lower epidermis: layer of cells on the lower surface. 6. Air
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