Modification of hydrophobic sorbents by cobalt chloride in order to concentrate low molecular polar organic substances from the air for subsequent gas chromatographic determination.

The article presents a new method of modification of hydrophobic sorbents. To improve sorption pre-concentration of polar organic compounds in the air analysis, these sorbents are coated with cobalt chloride. This modification increases retention volume of lower alcohols by 5-10 fold as compared to that of unmodified sorbents and solves the problem of gas-chromatographic determination at 1-2 ppb (micrograms/m(3)) by using the most common flame ionization detector. It should be noted that the modification of hydrophobic sorbents by cobalt chloride has little influence on their porosimetry parameters (specific surface area, proportions of meso- and micropores) and modified sorbents are capable of retaining hydrophobic nonpolar and weakly polar analytes as well as original unmodified sorbents. Thus, a fairly simple procedure leads to a large positive effect.

[First experience with vertical gastroplasty in the treatment of patients with 4th-degree obesity]. / Pervyi opyt vertikal'noi gastroplastiki v lechenii bol'nykh ozhireniem IV stepeni.

The article discusses four operations for vertical gastroplasty performed for the first time in Russia at the Research Centre of Surgery, RAMS, for degree IV obesity (the body weight of the patients ranged from 115 to 183 kg). The suturing instruments CEEA-28, TA-90, and CIA-90 manufactured by Auto Suture Instruments, USA, were used. Subsequent examination of patients in follow-up periods of as long as 4 months showed a favorable effect of the operations: body weight reduced, the patient's health and the course of concomitant diseases was milder.