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Define Glass photo-emissive tubes?
Glass photoemissive tubes are those which consist of a curved metal cathode, coated with a photosensitive material. While light strikes its surface, cathode emits electrons which are attracted to positively charged anode, causing a current to flow that is directly proportional to the light intensity. The phototube is either evacuated or filled with an motionless gas at low pressure. In the later, the electrons emitted from cathode strike gas molecules that release more electrons and thus amplify the current response to the fight radiation. Although tubes are available for wavelengths well beyond both ends of the visible spectrum, two tubes are needed to cover a range of 200-800 nm.
Why could a disease be more serious in a population with a low genetic diversity? A population with a low genetic diversity could be more expected to be wiped out by a disease
How do embryos of placental mammals excrete nitrogen wastes? Placental animals, as well as embryos, excrete urea. In the adult placental mammal urea is excreted by the urine.
Thermal Stratification - Lake Ecosystem Shallow lakes show no thermal stratification as their waters are well mixed, resulting in uniform temperature throughout. However lakes
what is recombinant dna technology
EPIBOLY - The epibolic movements occur only in the prospective ectodermal blastomeres. In the blastula of frog, migration and rearrangement of microceres over megameres i
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Define Regulation of amino acid levels in the blood? Regulation of amino acid levels in the blood: Vitamin D helps to prevent loss of amino acids through the kidney and thus
A fifth member of the monoamine transmitter group is histamine. That release histamine as their neurotransmitter is located in the hypothalamus and project to cerebral cortex, lim
Define Classification of Carbohydrates? Carbohydrates are defined as polyhydroxy aldehydes or ketones or substances that produce such compounds when hydrolyzed. Carbohydrates a
Explain the Root amputation, Hemisectioning and Bicuspidization Root amputation: removal of one or more roots of a multirooted tooth "upper teeth". Hemisectioning: surgic
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