Direct Spread Spectrum Technology for Data Hiding in Audio.

Direct spread spectrum technology is traditionally used in radio communication systems with multiple access, for example, in CDMA standards, in global satellite navigation systems, in Wi-Fi network wireless protocols, etc. It ensures high security and reliability of information transfer. In addition, spread spectrum technology provides the transmitted signals with a noise-like appearance, thus hiding the semantic content of the messages.

[The neurocognitive and neuropsychological testing in cardiac surgery].

Studying the cognitive disorders after cardiac surgery is on of the pressing question nowadays. Cognitive and psychoemotional disorders are associated with presence of general pathogenetic factors (phenomenon of isolation and frontal dysfunction) and directly influence each other. Only combined neurocognitive and neuropsychological testing makes it possible to define the presence and degree of disorder's intensity.

[The oxidative metabolism of the blood neutrophilic granulocytes in precancer and cancer of the stomach].

The results of investigation of blood polymorphonuclear leukocytes oxidative metabolism by nitroblue tetrazolium (NBT) test and luminol-dependent chemiluminescence in patients with gastric precancer and cancer are presented. Chemiluminescence was increased in the patients of both groups as compared with control. Disturbances in oxidative metabolism of neutrophils was detectable by NBT test when functional test was used.