Calcium salts of analogues of dipicolinic acid were substituted for calcium dipicolinate in tests of germination of spores of Bacillus megaferium ATCC 10778. Only 4Hpyran-2,6-dicarboxylic acid was as active as dipicolinic acid. 3-Methyldipicolinic acid and 4-methyl-4H-pyran-2, B-dicarboxylic acid were active but the germination proceeded less rapidly. In the presence of a threshold concentratio...

The ability of bile salts to inhibit the precipitation of either calcium hydroxyapatite or its precursor, amorphous calcium phosphate, by reducing Ca2+ activity or poisoning nascent crystals was determined. When apatite precipitated rapidly (1-4 h), glycocholate and taurine-conjugated bile salts (up to 100 mM) had little effect on apatite formation, but prevented amorphous calcium phosphate pre...

Glucose. ...................... Sodium acetate (anhydrous). ... Salts A K~HPOI ..................... KHzPOr .................... Salts B MgSOa.7HzO. ................ MnS01.4H20. ............... NaCl ........................ FeSO,.7HzO .................. Adenine ....................... Guanine ....................... Uracil ......................... Thiamine chloride. ............. Pyridoxamine ...

Within the past few years evidence has gradually accumulated, both direct and indirect, indicating some definite relation, the nature of which is as yet quite obscure, between the kations of calcium salts and certain forms of muscle irritability. The observations recorded may be summarized as follows : ( I ) Abnormal muscular twitchings and contractions may be brought about in an organism by a ...

Six isolates of Botrytis cinerea were isolated from leaves and stems of different tomato varieties taken from four areas in the northwest of Algeria where tomato is mostly grown in greenhouses and high tunnels. The purpose of this research was to determine the effect of two salts, NaCl and CaCl2, on three stages of Botrytis cinerea's life cycle. All isolates tested were stimulated in 50 to 150 ...

Nephrolithiasis is one of the most frequent urologic diseases. The aim of this paper is to study the composition and frequency of 8854 patient kidney stones and in a subset of them their metabolic risk factors to be related to their type of calculi. Physicochemical and crystallographic methods were used to assess kidney stone composition. In a subset of 715 patients, we performed an ambulatory ...

V ARIOUS salts have been used in ruminant rations in attempts to reduce the incidence of urinary calculi. Bushman et al. (1967) have recently reported on the relative effectiveness of ammonium chloride, calcium chloride, sodium chloride and calcium carbonate. Also, a protective effect against phosphatic urolithiasis has been assigned to dietary potassium by Robbins et al. (1965). Crookshank (19...

We studied the absolute bioavailability of calcium from calcium L-lactate in mice using pharmacokinetics, and reviewed the absolute bioavailability of calcium from three other calcium salts in mice previously studied: calcium chloride, calcium acetate, and calcium ascorbate. The results showed that calcium metabolism is linear between intravenous administration of 15 mg/kg and 30 mg/kg, and is ...

The chemical history of dust particles in the atmosphere is crucial for assessing their impact on both the Earth's climate and ecosystem. So far, a number of studies have shown that, in the vicinity of strong anthropogenic emission sources, Ca-rich dust particles can be converted into aqueous droplets mainly by the reaction with gaseous HNO(3) to form Ca(NO(3))(2). Here we show that other simil...