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Short answer The causes of death after heroin, cocain or cannabis overdose are mainly due to cardiac and respiratory arrest, and not to neurotoxic effects. Background The cause of death after a lethal overdose of your mentioned drugs, and heroin for reference, are the following : Cocaine (lethal dose: 30 mg - 5 g via mucus membrane (EMCDDA)): ...


5

                             A Note on proteolytic activity of certain snake venoms. Venoms from vipers contain high amount of proteolytic enzymes (serine proteases). Many of them act by cleaving fibrinogen and thereby causing blood clot [1]. There is a likelihood that some of ...


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Short answer Many snake poisons target specific proteins not present in unicellular organisms. Background The question is admittedly broad but the idea behind this question is pretty much what you indicate in your post - many venoms target specific proteins and do not simply destroy their target by, e.g., disrupting gross cellular structure (like alcohol ...


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The stinging hairs (trichomes) of the common North American nettle (Urtica dioica) are sharp, pointed cells. These nucleated cells are embedded in a base of smaller epidermal cells. The shaft of the trichome is composed of silica. Upon touch, the tip breaks off, leaving a sharp tip similar to a hypodermic needle. The hollow trichome penetrates the skin, and ...



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