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Protection Against Insect Bites
To minimize insect bites, travellers should wear light-colored, long-sleeved shirts, pants and socks. The most effective topical insect repellent is N, N-diethyl-m-toluamide (DEET). Sprayed on exposed skin, DEET repels mos- quitoes, ticks, chiggers, fleas, gnats and some flies. DEET is available in formulations of 5-40% and 100%. Higher concentrations do not improve efficacy, but usually protect longer; 30-35% DEET formulations are preferred by Medical Letter consultants. A long-acting DEET formulation originally developed for the US Armed Forces (US Army Extended Duration Topical Insect and Arthropod Repellent - EDTIAR) containing 25-33% DEET (Ultrathon) can provide protection for 6-12 hours
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Determine Minerals Requirements at high altitude? Increased urinary excretion of Nat and K + on exposure to hypoxia is reported while some workers have found only increase in
Q. Why is cannibalism an inharmonious intraspecific ecological interaction? In the cannibalism an individual eats other of the same species (occurs in some arachnids and insect
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At 1 AM, a researcher places a healthy squid giant axon in a bath of normal squid physiological extracellular saline and internally perfuses the axon with normal squid intracellula
VACUOLES Some animals cells may have one to a few small fluid filled vacuoles.. Plants cells in general possess one or a few large vacuoles. Vacuoles of animals cells
Q. Why is the occurrence of eyelids in amphibians in comparison to their absence in fishes an adaptation to terrestrial life? Eyelids associated to lacrimal glands protect and
Q. Why are vaccines made of the own disease agent or of fragments of it? The goal of vaccines is to artificially induce a specific primary immune response (and the consequent f
The state of balance in the internal environment of the body it includes control of the water balance of the blood, body temperature, blood sugar level and blood urea level. Each o
How is the genetic determination of sex established in humans? In the diploid genome of the human beings, there are 46 chromosomes, 44 of them are autosomes and two are sex chr
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