Formation of homopolymers of ribonucleotides by polynucleotide phosphorylase is well known (1, 2). In this reaction, a polymerization of ribonucleoside diphosphates occurs with the elimination of inorganic orthophosphate. Reactions involving formation of polyadenylic acid from adenosine triphosphate with elimination of an inorganic pyrophosphate group have been described with enzymes from sever...

The present study was an attempt to investigate whether the renal accumulation of Cu observed in the kidneys of rats and guinea-pigs exposed to arsenite (As-III) was an effect of arsenite alone or also shared by its metabolites--arsenate (As-V), dimethylarsinic acid and monomethylarsonic acid. The four arsenic compounds were administered subcutaneously and separately to rats for 12 days in incr...

Inorganic–organic superlattice (SL) thin films are intriguing candidates for flexible thermoelectric applications; in such SLs, the heat conduction can be efficiently blocked at inorganic/organic interfaces. Fabrication of these materials using atomic/molecular layer deposition (ALD/MLD) technique allows precise layer-sequence manipulation. Another unique advantage ALD/MLD is its capability to ...

It is known that many bacteria are susceptible to low pH, but it less clear how the acid nature influences this susceptibility. The objective of work was evaluate susceptibility selected different pH conditions and understand if their tolerance affected by type (organic vs inorganic) in media acidification. Strains species human pathogenic were cultivated at acidic conditions, using organic or ...

introduction: p in soils exists in many complex chemical forms, which differ markedly in their behavior, mobility and resistance to bioavailability in the soils. the total p content of a soil provides little information regarding the behavior of p in the environment. the various forms of p present to a large degree, determine the fate and transport of p in soils. fractionation schemes using dif...

I. Groups of chicks were given diets containing four levels of vitamins A and D, I , 10, 100 and 1000 times the basal level, in all sixteen combinations, with the object of investigating a possible antagonism between the two vitamins. 2. Only diets containing 1000 times the basal level (approx. 1700 times the dietary requirements) of one or both vitamins depressed growth and induced changes in ...

BACKGROUND Tobacco smoke is a major risk to the health of its users and arsenic is among the components of smoke present at concentrations of toxicological concern. There are significant variations in human toxicity between inorganic and organic arsenic species and the aim of this study was to determine whether there are predictable relationships among major arsenic species in tobacco that coul...

Intracellular acidosis due mainly to lactic acid accumulation has been regarded as the most important cause of skeletal muscle fatigue. Recent studies on mammalian muscle, however, show little direct effect of acidosis on muscle function at physiological temperatures. Instead, inorganic phosphate, which increases during fatigue due to breakdown of creatine phosphate, appears to be a major cause...

Abstract Since air pollution is one of the most serious environmental problems, study effects particulate matter (PM) on physiological processes remains to be an important challenge for scientific communities. The presented studies form part project ‘Air Pollution versus Autoimmunity: Role multiphase aqueous Inorganic Chemistry’. In these we examined effect Standard Reference Material 1648a, su...