全文获取类型
收费全文 | 131篇 |
免费 | 12篇 |
专业分类
143篇 |
出版年
2023年 | 1篇 |
2022年 | 2篇 |
2021年 | 1篇 |
2020年 | 2篇 |
2019年 | 1篇 |
2018年 | 2篇 |
2017年 | 3篇 |
2016年 | 1篇 |
2015年 | 2篇 |
2014年 | 4篇 |
2013年 | 5篇 |
2012年 | 5篇 |
2011年 | 8篇 |
2010年 | 5篇 |
2009年 | 3篇 |
2008年 | 6篇 |
2007年 | 13篇 |
2006年 | 6篇 |
2005年 | 5篇 |
2004年 | 3篇 |
2003年 | 7篇 |
2002年 | 3篇 |
2001年 | 7篇 |
2000年 | 9篇 |
1999年 | 5篇 |
1998年 | 2篇 |
1997年 | 1篇 |
1996年 | 1篇 |
1995年 | 1篇 |
1992年 | 2篇 |
1991年 | 4篇 |
1990年 | 1篇 |
1989年 | 4篇 |
1988年 | 3篇 |
1987年 | 4篇 |
1985年 | 1篇 |
1984年 | 2篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1976年 | 2篇 |
1974年 | 1篇 |
1972年 | 2篇 |
1970年 | 1篇 |
排序方式: 共有143条查询结果,搜索用时 0 毫秒
71.
The S2 state of the oxygen-evolving Mn-cluster of Photosystem II (PS II) is known to have different forms that exhibit the g =2 multiline and g = 4.1 EPR signals. These two spin forms are interconvertible at > 200 K and the relative amplitudes of the two signals are dependent on the species of cryoprotectant and alcohol contained in the medium. Also, it was recently found that the mutiline form can be converted to the g = 4.1 form by absorption of near-infrared light by the Mn-cluster itself at around 150 K [Boussac et al. (1996) Biochemistry 35: 6984–6989]. We have used light-induced Fourier transform infrared (FTIR) difference spectroscopy to study the structural difference in these two S2 forms. FTIR difference spectra for S2/S1 as well as for S2QA
-/S1QA measured at cryogenic temperatures using PS II membranes in the presence of various cryoprotectants, and monohydric alcohols did not show any specific differences except for intensities of amide I bands, which were larger when ethylene glycol or glycerol was present in addition to sucrose. This result was interpreted due to more flexible movement of the protein backbones upon S2 formation with a higher cryoprotectant content. Light-induced difference spectra measured at 150 K using either blue light without near-infrared light or red plus near-infrared light also did not show any detectable difference. In addition, a different spectrum upon near-infrared illumination at 150 K of the PS II sample in which the S2 state had been photogenerated at 200 K exhibited no meaningful signals. These results indicate that the two S2 forms that give rise to the multiline and g = 4.1 signals have only minor differences, if any, in the structures of amino-acid ligands and polypeptide backbones. This conclusion suggests that conversion between the two spin states is caused by a spin-state transition in the Mn(III) ion rather than valence swapping within the Mn-cluster that would considerably affect the vibrations of ligands.This revised version was published online in October 2005 with corrections to the Cover Date. 相似文献
72.
Previously, we reported that artificial zinc-finger proteins (AZPs) inhibited virus DNA replication in planta and in mammalian cells by blocking binding of a viral replication protein to its replication origin. However, the replication mechanisms of viruses of interest need to be disentangled for the application. To develop more widely applicable methods for antiviral therapy, we explored the feasibility of inhibition of HPV-18 replication as a model system by cleaving its viral genome. To this end, we fused the staphylococcal nuclease cleaving DNA as a monomer to an AZP that binds to the viral genome. The resulting hybrid nuclease (designated AZP–SNase) cleaved its target DNA plasmid efficiently and sequence-specifically in vitro. Then, we confirmed that transfection with a plasmid expressing AZP–SNase inhibited HPV-18 DNA replication in transient replication assays using mammalian cells. Linker-mediated PCR analysis revealed that the AZP–SNase cleaved an HPV-18 ori plasmid around its binding site. Finally, we demonstrated that the protein-delivered AZP–SNase inhibited HPV-18 DNA replication as well and did not show any significant cytotoxicity. Thus, both gene- and protein-delivered hybrid nucleases efficiently inhibited HPV-18 DNA replication, leading to development of a more universal antiviral therapy for human DNA viruses. 相似文献
73.
Tryptophan (Try) metabolism of Arthrobacter sp. was examined. The inducibility of the Try oxidizing enzyme system seems to be correlated with that of the indole-3-acetic acid (IAA) oxidizing enzyme system. Try is metabolized to IAA via indole-3-pyruvic acid (Ip) and indole-3-acetaldehyde (IAAId). Indole-3-acetamide (IAm) is formed as a product of Try oxidation. Exogenous IAm, indole-3-acetonitrile (IAN) and tryptamine are not oxidized by Try-induced cells. 相似文献
74.
75.
Yutaro Kimura Yutaka Fukuda Rumi Otsu Juwanen Yu Sayaka Mino Satoru Misawa Satoshi Maruyama Yuta Ikeda Remi Miyamachi Hiroshi Noguchi Satoshi Kato Yasuhito Yamamoto Tomoo Sawabe 《Environmental microbiology》2023,25(12):2834-2850
Polybutylene succinate (PBS) is an eco-friendly green plastic. However, PBS was shown as being non-biodegradable in marine environments, and up until now, only a limited number of PBS-degrading marine microbes have been discovered. We first set up in vitro PBS- and PBSA (polybutylene succinate adipate)-plastispheres to characterize novel PBS-degrading marine microbes. Microbial growth and oxygen consumption were observed in both PBS- and PBSA-plastispheres enriched with natural seawater collected from Usujiri, Hokkaido, Japan, and Vibrionaceae and Pseudoalteromonadaceae were significantly enriched on these films. Further gene identification indicated that vibrios belonging to the Gazogenes clade possess genes related to a PBS degrading enzyme (PBSase). The PBS degradation assay for six Gazogenes clade vibrios identified Vibrio ruber, Vibrio rhizosphaerae, and Vibrio spartinae as being capable of degrading PBS. We further identified the gene responsible for PBSase from the type strain of V. ruber, and the purified recombinant vibrio PBSase was found to have low-temperature adaptation and was active under high NaCl concentrations. We also provided docking models between the vibrio PBSase and PBS and PBSA units to show how vibrio PBSase interacts with each substrate compared to the Acidovorax PBSase. These results could contribute to a more sustainable society through further utilization of PBS in marine environments and plastic recycling. 相似文献
76.
Gandhi SR Gierliński M Mino A Tanaka K Kitamura E Clayton L Tanaka TU 《Developmental cell》2011,21(5):920-933
Highlights? Microtubule (MT) rescue is promoted by a laterally associated kinetochore (KT) ? MT rescue at and distal to the KT is promoted by Stu2 transfer and transport from the KT ? MT rescue prevents KT detachment from the MT end when KT end-on tethering fails ? MT extension following rescue facilitates collection of other widely scattered KTs 相似文献
77.
Mino K Imamura K Sakiyama T Eisaki N Matsuyama A Nakanishi K 《Bioscience, biotechnology, and biochemistry》2001,65(4):865-874
Cysteine synthetase from Escherichia coli is a bienzyme complex composed of serine acetyltransferase (SAT) and O-acetylserine sulfhydrylase-A (OASS). The effects of the complex formation on the stability of SAT against cold inactivation and proteolysis were investigated. SAT was reversibly inactivated on cooling to 0 degrees C. Ultracentrifugal analysis showed that SAT (a hexamer) was dissociated mostly into two trimers on cooling to 0 degrees C in the absence of OASS, while in the presence of OASS one trimer of the SAT subunits formed a complex with one dimer of OASS subunits. In the presence of OASS, not only the cold inactivation rate was reduced but also the reactivation rate was increased. Furthermore, SAT became stable against proteolytic attack by alpha-chymotrypsin and V8 protease by forming the complex with OASS. On the other hand, SAT was degraded by trypsin in the same manner both in the presence and in the absence of OASS. The different tendency in the stability against proteolysis with the different proteases was discussed with respect to the substrate specificity of the proteases and amino acid sequence of the C-terminal region of SAT that interacts with OASS. 相似文献
78.
Koshiki Mino Tsuyoshi Yamanoue Katsuhiro Ohno Takaharu Sakiyama Naoki Eisaki Asahi Matsuyama Kazuhiro Nakanishi 《Biotechnology letters》2001,23(24):2051-2055
-(Pyrazol-1-yl)-l-alanine (-PA) was produced from l-serine and pyrazol using recombinant Escherichia coli cells expressing serine acetyltransferase and O-acetylserine sulfhydrylase-A. The amount of -PA increased with increasing l-serine concentrations up to 600 mM at 50 mM pyrazol while 100 mM pyrazol gave the highest -PA production with 50 mM l-serine. Under the optimized conditions, -PA accumulated in the broth at approximately 140 mM with a conversion of 90% with respect to the added amount of pyrazol. 相似文献
79.
We investigated a new EPR signal that gives a broad line shape around g=2 in Ca(2+)-depleted Photosystem (PS) II. The signal was trapped by illumination at 243 K in parallel with the formation of Y(Z)*. The ratio of the intensities between the g=2 broad signal and the Y(Z)* signal was 1:3, assuming a Gaussian line shape for the former. The g=2 broad signal and the Y(Z)* signal decayed together in parallel with the appearance of the S(2) state multiline at 243 K. The g=2 broad signal was assigned to be an intermediate S(1)X* state in the transition from the S(1) to the S(2) state, where X* represents an amino acid radical nearby manganese cluster, such as D1-His337. The signal is in thermal equilibrium with Y(Z)*. Possible reactions in the S state transitions in Ca(2+)-depleted PS II were discussed. 相似文献
80.
K Dekker N Kojima S Yamamoto K Tatsumi M Mino K Yagi 《Biochemistry international》1987,14(6):997-1001
A fluorometric method to estimate adriamycin accumulation in cells was used to discriminate adriamycin- and vincristine-resistant sublines from sensitive parental P388 murine leukemia cells. It was easily checked that adriamycin accumulation was lower in the adriamycin- and vincristine-resistant cells than in the sensitive ones. With this method we found that tamoxifen as well as diltiazem increased adriamycin accumulation in the resistant cells to a level similar to that in the sensitive ones. The effect of progesterone was much less. 相似文献