The effects of magnesium and calcium on the adenosine triphosphate-induced contraction of glycerinated muscle fibers were recently reexamined. Magnesium and calcium were both shown to have a dual effect on the contractility of glycerinated fibers (1). By using myosin B suspensions in place of glycerinated fibers, we compared the dual effect of magnesium on the contractile phenomenon called “sup...

Magnesium sulfate is widely used in obstetrics and is drug of choice in two important complications of pregnancy, preeclampsia and preterm labor. The antagonistic effects of magnesium sulfate on calcium ion and on platelet aggregation may lead to changes in bleeding time. This study was conducted to evaluate the effect of magnesium sulfate on bleeding time in women with threatened preterm labor...

OBJECTIVE Inverse associations between magnesium and calcium intakes and risk of type 2 diabetes have been reported for studies in predominantly white populations. We examined magnesium, calcium, and major food sources in relation to type 2 diabetes in African-American women. RESEARCH DESIGN AND METHODS This is a prospective cohort study including 41,186 participants of the Black Women's Heal...

A multiparametric flow system based on multicommutation and binary sampling has been designed for the automated determination of sodium, potassium, calcium, and magnesium in large-volume parenteral solutions and hemodialysis concentrated solutions. The goal was to obtain a computer-controlled system capable of determining the four metals without extensive modifications. The system involved the ...

Considerable difference of opinion exists at present concerning the relative amounts of calcium and magnesium excreted in normal urine. Hammarstenl states that of a daily urinary excretion of somewhat more than 1 gm., two-thirds is magnesium and one-third calcium. Bertram in a 3 day period found 0.268 gm. of MgO and 0.167 gm. of CaO; RenvalJ3 and Long and Gephart,4 on the contrary, report figur...

The bioaccumulation of alkali and alkaline earth metals such as sodium, potassium, calcium and magnesium were estimated in five different organs i.e., tissue, kidney, gills, liver, and testis/ovary of rohu, Labeo rohita (Ham.). The samples were collected from three study areas namely Kendrapada (KPD), Keonjhar (KEO) and Central Institute of Freshwater Aquaculture (CIFA) in Odisha. There was rec...

Magnesium plays a special role in RNA function and folding. Although water is magnesium's most common first-shell ligand, the oxyanions of RNA have significant affinity for magnesium. Here we provide a quantum mechanical description of first-shell RNA-magnesium and DNA-magnesium interactions, demonstrating the unique features that characterize the energetics and geometry of magnesium complexes ...

Calcium, phosphorus, magnesium and vitamin D have important biological roles in the body, especially in bone metabolism. We aimed to study the reported intake, the disparity between the reported consumption and the level needed for adequacy and food sources of these four nutrients in the Spanish population. We assessed the reported intake for both, general population and plausible reporters. Re...

Kobayashi, A., Utsunomiya, T., Ohbe, Y., and Nagashima, Y. (1974). Archives of Disease in Childhood, 49, 90. Intestinal absorption of calcium and magnesium in hepatobiliary disease in infancy. The intestinal absorption of calcium and magnesium was measured by metabolic balance studies in 6 normal infants, 13 infants with biliary atresia, 5 infants with successfully repaired biliary atresia, 7 i...

Several studies have shown an increase in urinary calcium excretion in response to a calcium load. However, because of the inverse changes in PTH levels with a calcium load, the effect of changes in serum calcium per se on its own excretion is unclear in humans. In this study we used a PTH clamp protocol to further characterize calcium-regulated renal calcium and magnesium handling and the rela...