The inhibition of cytochrome c oxidase by cyanide, starting either with the resting or the pulsed enzyme, was studied by rapid-freeze quenching followed by quantitative e.p.r. It is found that a partial reduction of cytochrome oxidase by transfer of 2 electron equivalents from ferrocytochrome c to cytochrome a and CuA will induce a transition from a closed to an open enzyme conformation, render...

Meteorite late heavy bombardment was a major event after the accretion of the earth. The relevance of organic syntheses driven by impact shocks was first proposed by Chyba and Sagan in 1992, based on the scanty indications available at the time. How would the contribution by meteorites to an early earth organic pool compare with the syntheses these meteorites might have induced after their impa...

samples of the waste rock obtained from marofengin south africa ground 60, 70 and 80% passing 75µm were leached with cyanide in bottle roll tests. the results obtained showed that the percentage gold dissolution depends more on the ore size consists than on the cyanide concentration with the highest average dissolution rates of 88.75, 94.34 and 95.90% found at 600, 500 and 500 ppm, for 60, 70 a...

Water resource scarcity, population growth, pollution of surface and groundwater by discharging toxic wastewater and subsequent diseases may raise the necessity of reusing and treatment of wastewater. Cyanide is one of the toxic materials which can be found in some industrial wastewaters. Strict laws set by international bodies have forced industries to work on developing efficient cyanide remo...

The manometric study of biological oxidations by the “direct method” of Warburg, when carried out in the presence of cyanide, involves the use of KOH-KCN mixtures (Krebs (4)) for the absorption of carbon dioxide. The following study describes the rate of distillation of HCN from the experimental solution under various conditions, and suggests a remedy for the difficulties occasionally encounter...

Introduction Carbon monoxide and hydrogen cyanide are often found in fire atmospheres. These gases can incapacitate rapidly and thus render the victim unable to escape from the fire. High concentrations of carbon monoxide and hydrogen cyanide found in the blood of fire victims indicate a degree of survival in the toxic fire atmosphere. Concentrations may be sufficiently high in the blood to att...

The energy values of iirtiatte-ans (Phaseolus lunatus) as affected by different processing treatments were determined. Average gains in body weight 17.38g for raw limabeans 48.07g cooked, 36.91g autoclaved, 32.57g soaked and 31.12g germinated beans. Feed conversion efficiency was signicantly improved the poore­st obtained lima-beans. Digestible (DE) metabolizable (ME) highly positively corre­la...