[Regulatory genes of garden pea (Pisum sativum L.) controlling the development of nitrogen-fixing nodules and arbuscular mycorrhiza: a review of basic and applied aspects].

The review sums up the long experience of the authors and other researchers in studying the genetic system of garden pea (Pisum sativum L.), which controls sthe development of nitrogen-fixing symbiosis and arbuscular mycorrhiza. A justified phenotypic classification of pea mutants is presented. Progress in identifying and cloning symbiotic genes is adequately reflected. The feasibility of using double inoculation as a means of increasing the plant productivity is demonstrated, in which the potential of a tripartite symbiotic system (pea plants-root nodule bacteria-arbuscular mycorrhiza) is mobilized.

[Use of piperacillin/tazobactam as empirical monotherapy in the treatment of bacterial infections in a resuscitation department]. / Primenenie piperatsillin/tazobaktama v kachestve émpiricheskoi monoterapii pri lechenii bakterial'nykh infektsii v reanimatsionnom otdelenii.

Fifteen patients with severe bacterial infection (12 with pneumonia) that developed in the resuscitation unit were subjected to the empirical monotherapy with piperacillin/tazobactam (P/T) or tazocin under an open randomized controlled experiment. P/T was administered intravenously in a dose of 4.5 g every 8 hours for 5 to 12 days (9.3 days on the average). When the monotherapy was not sufficiently efficient the patients were additionally treated with amikacin administered intravenously in a dose of 0.5 g every 8-12 hours. The favourable effect was observed in 14 patients (93 per cent). 7 of them were treated with P/T alone and 7 were treated with P/T in combination with amikacin. The primary pathogens were eradicated in 8 (73 per cent) out of the 11 patients treated with P/T alone. Before the treatment 34 microbial strains were isolated from the patients. 77 per cent of them were susceptible to P/T. The treatment with P/T resulted in eradication of 27 bacterial strains (79 per cent) including 67 per cent of gram-positive organisms and 86 per cent of gram-negative organisms. The adverse effects were recorded in 1 patient on the 6th day of the treatment: skin eruption and pruritus that required the treatment discontinuation. The results showed that the use of P/T in the initial empirical monotherapy of infections in patients under resuscitation conditions could be efficient.

[Effect of mineral phosphorus on mycoheptin biosynthesis]. / Vliianie mineral'nogo fosfora na biosintez mikogeptina

The effect of mineral phosphorus in doses of 22.8 to 684 gamma/ml in a synthetic medium on biosynthesis of mycoheptin, an antifungal antibiotic was studied. It was found that the maximum productivity of the mycelium was at the phosphorus concentration in the medium equal to 22.8--45.6 gamma/ml and the concentration of 91.2 gamma/ml was optimal for the growth of the antibiotic-prodicing organism. The phosphorus optimal concentrations for the growth and antibiotic synthesis phases did not coincide that provided consideration of phosphorus as a limiting factor useful in control of the antibiotic biosynthesis. The content of pphosphorus in the medium 6 times higher than the optimal concentration did not inhibit the biomass accumulation and had no significant effect on the colony morphology.