Calcium producers

Of the elements characteristically present as major components of nonsaline waters, only calcium produced a slight interference. A weak calcium line at approximately 190.73 nm partially overlaps the sulfur fine such that 1000 mg/1 Ca produces an apparent signal of 25 mg/1 sulfate. Correction for this interference is easily achieved by establishing the relationship between calcium concentration and apparent sulfate signal, and inserting this information in the controlling software. The effect of calcium was then automatically subtracted during the measurement of the sample. 

The yield is approximately 7 g. of finely divided calcium. The principal difference between the products of the two syntheses lies in the nitrogen content. Commercial undistilled calcium has a relatively high nitride content which is not removed in the recrystallization from sodium and subsequent isolation. The calcium produced from calcium chloride in the previous synthesis, on the other hand, should have a low nitride content if low-nitrogen argon or helium is used as the atmosphere. ... 

MsodAsh is equal to the amount of soda ash needed to precipitate the noncarbonate hardness of calcium and the amount of soda ash needed to precipitate the noncarbonate hardness of calcium produced from the precipitation of the noncarbonate hardness of magnesium. Thus,... 

H)2D3 also appears to mobilize calcium from bone, although the presence of parathyroid hormone is necessary. The rise in plasma calcium produced by l,25-(OH)2D3 also seems to involve protein and RNA synthesis, and it has been suggested that a calcium-binding protein is synthesized in response to the vitamin 0. High affinity binding proteins for vitamin D metabolites have been found in bone cytosols. 

Soluble oxalates in the leaves are absorbed via the gastrointestinal tract. Once absorbed, oxalates bind with calcium producing secondary hypocalcemia. 

The effects of berbamine on energy metabolism in isolated rat alveolar type II cells (cells which play a critical role in the maintenance of normal lung function) were studied. Incubation of type II cells with berbamine produced a reduction in cellular ATP content, but there was no effect of the alkaloid on cellular oxygen consumption. Berbamine produced an increase in internal calcium levels of type II cells, and incubation of the cells with calcium ionophore, 4-bromo A-23187, led to increased amounts of cellular calcium and reductions in ATP levels, with no effect on oxygen consumption. Exposure of isolated lung mitochondria to calcium produced a concentration-dependent reduction in ATP synthesis with no effect on mitochondrial oxygen... 

In 1945, Campbell and McDermott [32] found that the reduction of diaUcylacety-lenes by calcium hexamine [CafNI-Isle] in diethyl ether yielded the corresponding trans alkenes. In 1984, Benkeser and Belmonte [33] reported results from detailed studies of the reduction of internal and terminal alkynes by calcium in a mixture of methylamine and ethylenediamine (1 1 v/v). For example, reduction of 4-oc-tyne gives a mixture of isomeric trans octenes in 75% overall yield it includes trans-2-, 3-, and 4-octenes in the ratio 1 9 88. Treatment of 1-heptyne, a terminal alkyne, with a fivefold excess of calcium produces 70% of a mixture containing 87% n-heptane, 7% tra s-2-heptene, and 3% 1-heptene. 

Three of the alkaline earth metals can be identified by flame tests. Calcium produces a scarlet color, while strontium produces a crimson color. Barium, which if present in a sample can mask the colors of both calcium and strontium, produces a yellow-green color. 

The reaction enthalpy can be converted to electron volts per mole (1 eV/mol 23 kcaFmol). The second stage is solid-state exothermic UF4 reduction with calcium, producing uranium and fluorite ... 

A Thiery Vella fistula was made of the entire colon, the distal part of the ileum was anastomosed with the rectum. The reduced intestinal tract was found to give just as much fecal calcium as the intact one. Again Ca injections were followed by extra increase of Ca in the urine, but not in the feces. Rich calcium diet and the injections of calcium produced no measurable amount of calcium secretion into the colon. 

Suitable measures to prevent crystalline sediments in the bottle are, e. g., cooling the wine for a few days to 0 °C, addition of metatartaric acid (cf. 20.2.4), and reducing the concentrations of potassium, calcium, and tartaric acid by electrodialysis. Excessive concentrations of calcium produced by deacidification measures (cf. 20.2.5.4) can also result in additional crystal sedimentation (calcium tartrate, calcium mucate, and calcium oxalate). The elimination of excess calcium with D-tartaric acid is recommended as a counter-measure. 

Lazarovici, R, Levi, B.Z., Lelkes, P.I., Kuizumi, S., Fujita, K., Matsuda, Y, Ozato, K. and Guroff, G. (1989). K252a inhibits the increase in c-fos transcription and the increase in intracellular calcium produced by nerve growth factor in PC 12 cells. J. Neurosci. Res., 23, 1-8. 

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