排序方式: 共有33条查询结果,搜索用时 15 毫秒
31.
Anikó Bertóková Alica Vikartovská Peter Gemeiner Ján Tkáč Dušan Chorvát 《Biocatalysis and Biotransformation》2015,33(2):111-120
A high-performance biocatalyst in the form of encapsulated cells of Gluconobacter oxydans have been developed for production of phenylacetic acid (PAA) as a natural flavor component. Polyelectrolyte complex (PEC) capsules consisting of sodium alginate, cellulose sulfate, poly(methylene-co-guanidine), CaCl2, and NaCl were used for highly controlled and mild encapsulation of cells. Utilization of encapsulated G. oxydans cells was a significant improvement on existing data on operational stability of cells and cumulative product concentration during biocatalytic production of PAA from 2-phenylethanol. Concerning operational stability, encapsulated cells were active over 12 cycles with a high biotransformation rate, while free cells were inactive after 7 cycles of use. The biocatalytic properties of encapsulated G. oxydans were tested in a bubble column reactor over 7 days with a final cumulative product concentration of 25 g/L. High cell viability (90%) was observed within PEC capsules by confocal laser scanning microscopy, performed before and after repetitive PAA production in the bubble column reactor. The surface microstructure of fully hydrated capsules with and without G. oxydans cells was investigated and compared using an environmental scanning electron microscope. 相似文献
32.
Árvay Július Šnirc Marek Hauptvogl Martin Bilčíková Jana Bobková Alica Demková Lenka Hudáček Marek Hrstková Miroslava Lošák Tomáš Král Martin Kováčik Anton Štefániková Jana 《Biological trace element research》2019,190(1):226-233
Biological Trace Element Research - The aim of the present study was to determine concentrations of 15 macro- and micro-elements in 10 commercially available plantation Arabica coffee brands. The... 相似文献
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Jan Kaštovský Tomáš Hauer Jan Mareš Markéta Krautová Tomáš Bešta Jiří Komárek Blanka Desortová Jiří Heteša Alica Hindáková Václav Houk Emil Janeček Radovan Kopp Petr Marvan Petr Pumann Olga Skácelová Eliška Zapomělová 《Biological invasions》2010,12(10):3599-3625
The invasion and spread of non-native species of many different kinds of organisms is of increasing interest to researchers. Invasions by microscopic organisms, however, are poorly understood, and their impact on the environment is probably underestimated. We collected available data on non-native and invasive/expansive algae and cyanobacteria in the Czech Republic; we mapped their distribution and assessed their impact on local species and other real or potential risks resulting from their spread. The list of alien species in the Czech Republic contains 10 species of cyanobacteria, 9 species of Bacillariophyceae, 1 species of Dinophyta, 1 species of Ulvophyceae, 2 species of Chlorophyceae, and 1 species complex of Zygnematopyceae. The literature on the worldwide occurrence of these taxa is also reviewed. 相似文献