Наноразмерные дискретные покрытия оксида меди на кристаллах хлорида натрия, осажденные из паровой фазы в вакууме

Приведены результаты исследования морфологии дискретного наноразмерного медного покрытия на поверхности порошка хлорида натрия. Способом электронно-лучевого испарения и конденсации из паровой фазы в вакууме получено равномерное и однородное покрытие. Средний размер частиц меди согласно результатам лазерной корреляционной спектроскопии составил 27 нм. Представлены рекомендации относительно возможного практического применения.The results of investigation of morphology of discrete nanodimensional copper coating on the surface of sodium chloride powder are presented. Uniform and homogeneous coating was produced by the method of electron beam evaporation and condensation from vapor phase in vacuum. The obtained average size of copper particles in accordance with results of a laser correlation spectroscopy was 27 nm. Recommendations are given for a possible practical application

Two naphthalene degrading bacteria belonging to the genera Paenibacillus and Pseudomonas isolated from a highly polluted lagoon perform different sensitivities to the organic and heavy metal contaminants

Two bacterial strains were isolated in the presence of naphthalene as the sole carbon and energy source from sediments of the Orbetello Lagoon, Italy, which is highly contaminated with both organic compounds and metals. 16S rRNA gene sequence analysis of the two isolates assigned the strains to the genera Paenibacillus and Pseudomonas. The effect of different contaminants on the growth behaviors of the two strains was investigated. Pseudomonas sp. ORNaP2 showed a higher tolerance to benzene, toluene, and ethylbenzene than Paenibacillus sp. ORNaP1. In addition, the toxicity of heavy metals potentially present as co-pollutants in the investigated site was tested. Here, strain Paenibacillus sp. ORNaP1 showed a higher tolerance towards arsenic, cadmium, and lead, whereas it was far more sensitive towards mercury than strain Pseudomonas sp. ORNaP2. These differences between the Gram-negative Pseudomonas and the Gram-positive Paenibacillus strain can be explained by different general adaptive response systems present in the two bacteria