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Amine N-methyltransferases from rabbit liver 总被引:2,自引:0,他引:2
N-Methylation of amines has been ascribed to enzymes listed as amine N-methyltransferase, indolethylamine N-methyltransferase, and arylamine N-methyltransferase. All of these activities are accomplished by each of two related enzymes present in rabbit liver. The two N-methyltransferases have a very broad and overlapping specificity for primary and secondary amines. Both have a molecular mass of 30,000 daltons and react with an antibody formed to one of them, but have different isoelectric points. 相似文献
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The thiol S-methyltransferase from rat liver has been solubilized and prepared in homogeneous form. The enzyme exists in a monomer of Mr 28,000 although enzyme activity is highly unstable with a half-life of 4 days under the best conditions of storage. The reaction requires S-adenosylmethionine as methyl donor but, as is the case with many enzymes active in detoxification, a large variety of lipophilic compounds can serve as acceptors. Acceptor activity is limited to thiols. The naturally occurring hydrophilic thiols, glutathione and cysteine, act neither as substrates nor as inhibitors. The course of the reaction is biphasic with an initial rapid formation of product that is followed by a slower linear rate. The suggestion is offered that this behavior reflects the slow dissociation of an enzyme-product complex composed of enzyme and S-adenosyl-homocysteine. 相似文献
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Bahram Abdollahi Nejand Ihteaz M. Hossain Marius Jakoby Somayeh Moghadamzadeh Tobias Abzieher Saba Gharibzadeh Jonas A. Schwenzer Pariya Nazari Fabian Schackmar Dirk Hauschild Lothar Weinhardt Uli Lemmer Bryce S. Richards Ian A. Howard Ulrich W. Paetzold 《Liver Transplantation》2020,10(5)
All‐perovskite multijunction photovoltaics, combining a wide‐bandgap (WBG) perovskite top solar cell (EG ≈1.6–1.8 eV) with a low‐bandgap (LBG) perovskite bottom solar cell (EG < 1.3 eV), promise power conversion efficiencies (PCEs) >33%. While the research on WBG perovskite solar cells has advanced rapidly over the past decade, LBG perovskite solar cells lack PCE as well as stability. In this work, vacuum‐assisted growth control (VAGC) of solution‐processed LBG perovskite thin films based on mixed Sn–Pb perovskite compositions is reported. The reported perovskite thin films processed by VAGC exhibit large columnar crystals. Compared to the well‐established processing of LBG perovskites via antisolvent deposition, the VAGC approach results in a significantly enhanced charge‐carrier lifetime. The improved optoelectronic characteristics enable high‐performance LBG perovskite solar cells (1.27 eV) with PCEs up to 18.2% as well as very efficient four‐terminal all‐perovskite tandem solar cells with PCEs up to 23%. Moreover, VAGC leads to promising reproducibility and potential in the fabrication of larger active‐area solar cells up to 1 cm2. 相似文献
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Saba Gharibzadeh Bahram Abdollahi Nejand Marius Jakoby Tobias Abzieher Dirk Hauschild Somayeh Moghadamzadeh Jonas A. Schwenzer Philipp Brenner Raphael Schmager Amir Abbas Haghighirad Lothar Weinhardt Uli Lemmer Bryce S. Richards Ian A. Howard Ulrich W. Paetzold 《Liver Transplantation》2019,9(21)
In this work, the authors realize stable and highly efficient wide‐bandgap perovskite solar cells that promise high power conversion efficiencies (PCE) and are likely to play a key role in next generation multi‐junction photovoltaics (PV). This work reports on wide‐bandgap (≈1.72 eV) perovskite solar cells exhibiting stable PCEs of up to 19.4% and a remarkably high open‐circuit voltage (VOC) of 1.31 V. The VOC‐to‐bandgap ratio is the highest reported for wide‐bandgap organic?inorganic hybrid perovskite solar cells and the VOC also exceeds 90% of the theoretical maximum, defined by the Shockley–Queisser limit. This advance is based on creating a hybrid 2D/3D perovskite heterostructure. By spin coating n‐butylammonium bromide on the double‐cation perovskite absorber layer, a thin 2D Ruddlesden–Popper perovskite layer of intermediate phases is formed, which mitigates nonradiative recombination in the perovskite absorber layer. As a result, VOC is enhanced by 80 mV. 相似文献
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