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651.
In addition to typical acetyl esters, acetic ester aoetyl-hydrolase fromMycobacterium phlei can degrade aliphatic acetylated amino acids under suitable conditions. 相似文献
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The interaction of the carcinogenic mycotoxin, aflatoxin B1, with some electrondonating organic compounds including aromatic hydrocarbons, dimethylaniline, and aromatic amino acids, was studied. Spectrophotometric analysis of aflatoxin B1 revealed that hypochromicity in the absorption around 360 nm and hyperchromicity around 385 nm were induced by dimethylaniline, hexamethylbenzene, tryptophan, and imidazole. A similar shifting of aflatoxin B1 absorption was observed in benzene, toluene, and xylene in the presence of ZnCl2. The interaction of aflatoxin B1 with polystyrene was observed in a biphasic system. The association constants of aflatoxin B1: DMA4 (1:1) and of aflatoxin B1: tryptophan (1:1) were found to be 0.64 and 22.6 liters per mole, respectively. The results suggest that charge-transfer interaction occurs between aflatoxin B1 and these π-electron donors. Since the spectral changes on aflatoxin B1 absorption induced by these π-electron donors are similar to those induced by nucleic acids and proteins, it is postulated that charge-transfer interaction also occurs between aflatoxin B1 and these macromolecules. The role of such interaction in the biological activity of aflatoxin B1 is discussed. 相似文献
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Jong‐Ho Lee Hyoungchul Kim Sung Moon Kim Tae‐Wook Noh Hwa‐Young Jung Hyun‐Yup Lim Hun‐Gi Jung Ji‐Won Son Hae‐Ryoung Kim Byung‐Kook Kim Hae‐June Je Jae‐Chun Lee Huesup Song Hae‐Weon Lee 《Liver Transplantation》2012,2(4):461-468
Glass‐based seals for planar solid‐oxide fuel‐cell (SOFC) stacks are open to uncontrolled deformation and mechanical damages, limiting both sealing integrity and stack reliability, particularly in thermal cycle operations. If the glass‐based seals work like an elastomer‐based compressive seal, SOFC stacks may survive unprecedented numbers of thermal cycles. A novel composite sealing gasket is successfully developed to mimic the unique features of the elastomer‐based compressive seal by controlling the composition and packing behavior of binary ceramic fillers. A single‐cell SOFC stack undergoes more than 100 thermal cycles with little performance loss, during which the sealing integrity is lost/recovered repeatedly upon cooling and reheating, corresponding to unloading/loading of the elastomer‐based compressive seal. The thermal‐cycle responses of the SOFC stack are explained in sequence by the concurrent events of elastic deformation/recovery of ceramic filler network and corresponding redistribution of sealing glass. 相似文献
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Saifuddin Farah Husna Arzaee Nurul Affiqah Noh Mohamad Firdaus Mohamad Bakar Mimi Hani Abu Teridi Mohd Asri Mat Takriff Mohd Sobri Ibrahim Mohd Adib 《Journal of applied phycology》2022,34(5):2423-2436
Journal of Applied Phycology - Sodium bicarbonate (NaHCO3) is a low-cost inorganic carbon source, highly soluble in water and widely used in microalgae research. Using carbon dioxide (CO2) gas in... 相似文献