Biofilm carrier type affects biogenic sulfur-driven denitrification performance and microbial community dynamics in moving-bed biofilm reactors.

Autotrophic denitrification with biosulfur (ADBIOS) provides a sustainable technological solution for biological nitrogen removal from wastewater driven by biogenic S, derived from biogas desulfurization. In this study, the effect of different biofilm carriers (conventional AnoxK™ 1 and Z-200 with a pre-defined maximum biofilm thickness) on ADBIOS performance and microbiomics was investigated in duplicate moving bed-biofilm reactors (MBBRs). The MBBRs were operated parallelly in continuous mode for 309 days, whilst gradually decreasing the hydraulic retention time (HRT) from 72 to 21 h, and biosulfur was either pumped in suspension (days 92-223) or supplied in powder form.

[Isolation of nisin from native solution and its purification on cationites].

It was found possible to use organic sorbents and in particular carboxylic cationites for isolation of nisin from the fermentation broth filtrate and its purification. Nisin is known as a polypeptide antibiotic applied as a preservative. The sorbents were shown to have high exchange capacities by the isolated substance and mechanical strength and resistance.

[Study of nisin, a polypeptide antibiotic produced by a culture of Streptococcus lactis, strain MSU].

The drug nisin produced by the lactic acid bacteria S. lactis, strain MSU, was identified and described. After 18-hour cultivation of the strain the fermentation broth was centrifuged.

[Myocardial substrate support before and after mitral commissurotomy].

The utilization by the myocardium of 8 substrates of the carboxydrate-lipid metabolism was assessed in 44 patients with the 3d and 4th stages of mitral stenosis before and after mitral commissurotomy by the method of the arterio-venous difference. The character of the myocardium supply with substrates with different energetic value was established to depend and to be a sufficiently objective criterium of prognosis of cardiac insufficiency in the early postoperative period.