Poisoning positive ions from

A complete separation of a carbonium ion from the hydride ion is very probably not necessary. It has been shown [73] by MO calculations that any attack by a charged species on an atom bonded to a carbon atom causes activation of the bonds from a /3-carbon atom to the substituents. In this way, the splitting of the Cp—Cy bond can be induced by adsorption of the alkane on a strongly acidic site. The preferential cracking of a saturated hydrocarbon chain in /3-positions to the position where a carbonium ion might be formed was observed early and named the /3-rule by Thomas [2], The question remains open as to which type of acidic centre is able to activate an alkane molecule. The fact that an aluminosilicate catalyst is poisoned for the cracking of alkanes by irreversibly adsorbed ammonia suggests a Lewis site [240], viz. 

Acnisal salicylic acid, aconiazide [inn] is an isoniazid analogue and an ANTITUBERCULAR and ANTIBACTERIAL AGENT, aconitine is an alkaloid from monk s hood or wolfsbane (Aconitum napellus) and other Aconltum spp. (Ranunculaceae). It is a NEUROTOXiN implicated in poisoning by A. spp., especially, 4. chasmanthum in India. Experimentally, it is a SODIUM-CHANNEL ACTIVATOR that binds to Na -channels, slows inactivation, shifts inactivation to a more negative value, and alters ion specificity. This results in repetitive firing of neurons, with marked effects on the heart including positive inotropism and arrhythmias. Aconitine (and the related alkaloid delphinine) were formerly used in... 

The poisoning by heavy metal ions seems to result from their complexing of Lewis base positions on nucleic acids, enzymes, etc., which are then prevented from their normal operation. EDTA treatment is useful for the cases mentioned above. However, mercury ions in the body must be present as HgCl2, and other complexes which are not favorable for EDTA reaction. For example, take the case of HgCl J,... 

The physical and chemical properties of an ionic compound such as NaCl are very different from those of the original elements. For example, the original elements of NaCl were sodium, which is a soft, shiny metal, and chlorine, which is a yellow-green poisonous gas. However, when they react and form positive and negative ions, they produce ordinary table salt, NaCl, a hard, white, crystalline substance that is important in our diet. 

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