Humic acids from oxidized coals I. Elemental composition, titration curves, heavy metals in HA samples, nuclear magnetic resonance spectra of HAs and infrared spectroscopy.

The formation of humic acids (HAs) from bituminous coal was verified by laboratory oxidation. In a relatively short time the oxidation by air at temperature above 150 degrees C led to the formation of HAs. These HAs were compared with those isolated from oxidized bituminous coal from the vicinity of red bed bodies, from weathered bituminous coal, oxihumolite and lignite.

[Microelements balance and correction in athletes++ under high muscular load].

The balance studies among the high-qualified adult sportsmen during the winter period of practices had shown that of the day of a 30-km cross the contents of iron, copper and manganese in the food ration fell to the lowest level of the physiological standard of people not going into sports due to sufficient physical load the process of microcomponents' secretion through bowels and kidneys was outstripping their replenishment from food. The balance of all three microcomponents was negative. During the following three days after the cross due to disbalanced food ration caused by the content of microcomponents the losses of iron and copper were not compensated.