The aim of the present study was to test whether titin is a calcium-dependent spring and whether it is the source of the passive force enhancement observed in muscle and single fiber preparations. We measured passive force enhancement in troponin C (TnC)-depleted myofibrils in which active force production was completely eliminated. The TnC-depleted construct allowed for the investigation of th...

Fractional intestinal absorption of calcium (FACa) was measured using radioactive calcium and 200 mg of calcium carrier provided either by yogurt or by CaCl2 in 7 lactase-deficient (L(-] and 7 normal (L(+] subjects. During the control period prior to yogurt consumption, mean calcium intake was 819 mg per day in L(-) and 931 mg per day in L(+) subjects (NS). In both groups of subjects yogurt inc...

Of the factors tested, the source and concentration of carbon and nitrogen in the medium exerted maximum effect on growth and acid production. Glucose (15%) and urea (0.14%) induced glucose oxidase synthesis and optimum yield of calcium gluconate. Potassium dihydrogen phosphate (0.2%) and magnesium sulphate (0.06%) stimulated glucose oxidase activity and calcium gluconate production. Borax at a...

Thalamocortical neurons integrate sensory and cortical activity and are regulated by input from inhibitory neurons in the thalamic reticular nucleus. Evidence suggests that during bursts of action potentials, dendritic calcium transients are seen throughout the dendritic tree of thalamocortical cells. Here, we review a recent study that suggests these calcium transients regulate inhibitory inpu...

Calcium carbonate and calcium-magnesium carbonate in the form of limestone, dolomite, marl, chalk, and Oyster shell are one of the most widely utilized non-metallic materials in the industrial world. The largest use of limestone or calcium carbonate is in the cement industry where it is used as a source of CaO and also in the concrete industry where it is used as the primary coarse aggregate. F...

women's health. although calcium deficiency intake is only one of the factors that effects bone fractures, there are many evidences that sufficient calcium have direct effect in bone density and reverse effect upon bone fractures rate. methods: this study is a descriptive cross-sectional type. a sample of 271 female students in tabriz medical sciences university, aged 20-25 years was studied in...

This study was conducted to evaluate the potential use of milk mineral (MM) as calcium source for production calcium-fortified yogurt. MM composed 83% minerals, 7.5% lactose, 3.3% protein, and < 1% fat. Calcium (Ca) content in about 46%; calcium: phosphorous ratio 1.28:1. The aqueous solubility Ca increased with decrease pH; at pH 4 5 98% 53%, respectively. Ca-fortified yogurt up 200 mg Ca/1...