Mg Of Mn Research Articles

Requirement of red sea bream for dietary trace elements.

Red sea bream, Chrysophrys major, were fed diets with or without supplemental trace elements (AI, Zn, Mn, Cu, Co, and I) over a 90 day period. No significant differences were detected between the two groups in the following determinations: the growth rate, feed efficiency, condition factor, and hepatosomatic index; the hemoglobin content, hematocrit value, red blood cell count, MCH, MCV, MCHC, MCD, percentage of immature erythrocytes, and number of lymphocytes and granulocytes per 1000 red blood cells in the whole blood; the blood serum levels of protein, glucose, urea-N, total bilirubin, total cholesterol, Ca, and inorganic P and Fe; the activities of GOT, GPT, ALP, LDH, and LAP in the blood serum; the lipid and glycogen content of the liver; and the lipid, ash, Ca, P, Mg, and K content of the vertebrae. Furthermore, no pathological change was found in the organs of fish fed the diet without the trace element supplement. From these findings, it appears that trace element supplementation in the diet for red sea bream is not essential, when the trace elements exist at levels exceeding 0.20mg of Al, 2.43mg of Zn, 1.78mg of Mn, 0.51mg of Cu, 0.43mg of Co, and 11.21μg of I per 100g diet.

Effect of Manganese Ions on the Contraction and Automaticity of the Blood-Perfused Canine Papillary Muscle

Effect of manganese ions (Mn) on the mammalian ventricular myocardium was investigated using the isolated blood-perfused papillary muscle from the canine right ventricle. Mn caused dose-dependently an increase in blood flow above 0.1 mg and negative inotropic and chronotropic effects above 0.3 mg, while there was little change in the configuration of EMG even at a dose of 30 mg of Mn. The effects of Mn on the contraction and blood flow of the papillary muscle preparation were reversible. Norepinephrine, caffeine and calcium induced a positive inotropic effect almost to the same extent in the control or in the depressed state after Mn treatment, while periarterial nerve stimulation definitely caused a diminished increase in the contractile force after Mn treatment. Furthermore, in the automatically beating papillary muscle the positive chronotropic responses to norepinephrine and periarterial nerve stimulation were more readily blocked by Mn than the positive inotropic ones. These observations suggest that Mn affects not only contraction but also catecholamine release and pacemaker potential.

Determination of Manganese in Iron, Steel and Ferromanganese (1st Report). Determination of Manganese in Iron and Steel

The suitable concentration of acids and other conditions in ferrous-permanganate method after oxidation with persulfate for the determination of Mn in iron and steel were studied and the following results were obtained: (1) Acid concentration: using 2 g of (NH4)2S2O8 in total volume of 200 mL, Mn was determined in the concentration range of 1.2∼2.4 N H2SO4, 0.53∼1.20 N HNO3 and 0.6∼1.2 N mixed acid of H2SO4 and HNO3(3:1) but Mn could not be determined in acidic solution with HClO4. (2) Boiling time: the time for boiling of the solution for oxidation of Mn by (NH4)2S2O8 using AgNO3 was 5 min., causing the decomposition of permanganic acid. (3) Influence of H3PO4: when 1 g of Fe and 10 mg of Mn were present, the existence of 4 mL of H3PO4 (Sp. Gr 1.7) was preferable. (4) The suitable procedure for the determination of Mn in iron and steel was established and the analysis was carried out with several sample and good results were obtained.