Dorsiflexor Muscle Oxygenation During Low, Moderate and Submaximal Sustained Isometric Contraction.

Sustained isometric contractions of skeletal muscles produce intramuscular pressures that lead to blood flow restriction. Thus, we have the paradox of rising O demand due to muscle activity and at the same time reduced blood flow. The aim was to assess muscle oxygenation during sustained isometric low (30%), moderate (60%) and submaximal [90% of maximal voluntary contraction (MVC)] contraction of the dorsiflexor muscle.

The visualization of natural luminescence of living cotton hairs.

Super-weak luminescence of individual living cotton cells was investigated. This phenomenon was observed under an optical microscope using a replica-reprint technique in conjunction with living cotton cells. Gelatin solution was used for visualization of luminescence in a polymer film deposited on the cotton cells.

Morphological defects in cotton hairs and the nature of their origin.

In vivo observations of the origin of native defects in cotton hairs were carried out during their development in unopened cotton bolls. It is shown that the formation of these structural defects is related to features of their packing inside the cotton bolts during the formation of the boll segments. A mechanism explaining the origination of these morphological defects is proposed.