The effect of enzymes carbohydrases exopolysaccharide matrix of biofilms formed by gram-positive and gram-negative bacteria on abiotic surfaces was studied. The ability of a mixture of carbohydrase enzymes (hydrolases and lyases) to completely destroy the matrix of biofilms formed by gram-positive and gram-negative bacteria causing health-associated infections has been confirmed. An optimal mixture of carbohydrases possesed high anti-biofilm activity even when employed in relatively small concentrations and at a brief exposure time.
The viability and symbiotic properties of active strain Bradyrhizobium japonicum 46 after its long-term storage using different methods were studied. It was established that strain storing in evaporative freezing conditions as well at periodic passages the strain preserves its ability to form active symbiosis with soybean plants. Long-term storage under the layer of mineral oil had negatively influenced on the symbiotic properties of B. japonicum 46 strain resulted in only partial restoration of strains virulence, nitrogen fixing activity and competitiveness.
Задача повышения эффективности антибактериальной ФДТ делает актуальными создание и исследование фотосенсибилизаторов (ФС) на основе поликатионных синтетических бактериохлоринов. Целью настоящей работы было изучить в широком диапазоне концентраций фотофизические и антибактериальные свойства наноструктурированного ФС на основе 3-Py4BСHp4Br4, тетракатионного амфифильного производного синтетического бактериохлорина. Наноструктурированную дисперсию ФС получили путем его солюбилизации в 4%-м Kolliphor ELP (BASF). Исследование интенсивности и формы спектров поглощения и флуоресценции в диапазоне концентраций от 0,001 до 0,2 мМ продемонстрировало низкую агрегацию этого ФС во всем диапазоне и высокую эффективность фотодинамической инактивации грамположительных бактерий S. aureus и грамотрицательных бактерий P. aeruginosa и K. pneumoniae.
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