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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.
What is Polymerase Chain Reactionin genetics? A great advance in sequencing and cloning DNA is the polymerase chain reaction, devised by the American biochemist Kary Mullis in
At 1 AM, an impermeable membrane separates a 1 liter solution of 2M KCl in the left compartment from a 1 liter solution containing both 1M NaCl and 1M KCl in the right compartment.
Give three ways in which a polar bear is adapted to its environment. A polar bear is adapted to its environment by its high ratio of bulk to surface area, a thick water-repelle
Define Some Caution for Inoculating Loops and Needles? 1. Heat the inoculating wire till it becomes red hot. 2. Never use hot inoculating wire for culturing otherwise cells
Brackish Water The content of dissolved salts in brackish water is higher than the fresh water and ranges between 0.5 to 35%. These waters of intermediate salinity range are d
Give three examples of cell structures which contain structural proteins. What is the other type of protein in a cell? (a) Cytoplasm, the cell membrane, memb
Lipids Lipids are oily or greasy organic compound forming about 3% of protoplasm. These are also compound of carbon hydrogen and oxygen but unlike carbohydrates. The hydrogen a
what are inorganic species
Determine in brief about the MSE The MSE deals with questions concerning the addressee's Consciousness, Emotional State, Thought Content and Clarity, Memory, Sensory Perception
does circular dsdna have domains
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