全文获取类型
收费全文 | 449篇 |
免费 | 21篇 |
出版年
2023年 | 3篇 |
2022年 | 2篇 |
2021年 | 15篇 |
2020年 | 2篇 |
2019年 | 6篇 |
2018年 | 10篇 |
2017年 | 12篇 |
2016年 | 18篇 |
2015年 | 17篇 |
2014年 | 27篇 |
2013年 | 45篇 |
2012年 | 46篇 |
2011年 | 31篇 |
2010年 | 17篇 |
2009年 | 21篇 |
2008年 | 28篇 |
2007年 | 27篇 |
2006年 | 17篇 |
2005年 | 30篇 |
2004年 | 24篇 |
2003年 | 19篇 |
2002年 | 19篇 |
2001年 | 9篇 |
2000年 | 1篇 |
1999年 | 3篇 |
1998年 | 1篇 |
1996年 | 1篇 |
1994年 | 1篇 |
1993年 | 2篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1990年 | 3篇 |
1989年 | 1篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1985年 | 1篇 |
1984年 | 2篇 |
1982年 | 1篇 |
1981年 | 2篇 |
1979年 | 1篇 |
排序方式: 共有470条查询结果,搜索用时 406 毫秒
381.
382.
383.
384.
Srinivasan Aparajitha Sundaram Vijayakumar Vidya Muthulakshmi M. Srivastava Smita 《Journal of plant biochemistry and biotechnology.》2022,31(1):154-167
Journal of Plant Biochemistry and Biotechnology - Alpha-tocopherol, a highly active form of the antioxidant vitamin E in humans, effectively scavenges free radicals and protects the cell membranes.... 相似文献
385.
Travis J. Stewart Vidya Murthy Sam P. Dugan Josh E. Baker 《The Journal of biological chemistry》2021,297(5)
Molecular motors such as kinesin and myosin often work in groups to generate the directed movements and forces critical for many biological processes. Although much is known about how individual motors generate force and movement, surprisingly, little is known about the mechanisms underlying the macroscopic mechanics generated by multiple motors. For example, the observation that a saturating number, N, of myosin heads move an actin filament at a rate that is influenced by actin–myosin attachment and detachment kinetics is accounted for neither experimentally nor theoretically. To better understand the emergent mechanics of actin–myosin mechanochemistry, we use an in vitro motility assay to measure and correlate the N-dependence of actin sliding velocities, actin-activated ATPase activity, force generation against a mechanical load, and the calcium sensitivity of thin filament velocities. Our results show that both velocity and ATPase activity are strain dependent and that velocity becomes maximized with the saturation of myosin-binding sites on actin at a value that is 40% dependent on attachment kinetics and 60% dependent on detachment kinetics. These results support a chemical thermodynamic model for ensemble motor mechanochemistry and imply molecularly explicit mechanisms within this framework, challenging the assumption of independent force generation. 相似文献
386.
387.
In vitro plant regeneration via embryogenesis was obtained in suspension cultures of Datura innoxia Mill. Embryogenesis was induced in suspension cultures raised from callus of androgenetic origin, using LS liquid medium supplemented with 0.22 mg/l 2,4-D. The total number of embryos formed was variable over time in culture. Embryos differentiated and matured in the liquid medium itself as also evidenced by histological observation. Embryos germinated to form plantlets on semisolid MS medium without growth substances. The regenerated plants had haploid number of chromosomes.Abbreviations BAP
6-benzylaminopurine
- 2,4-D
2,4-dichlorophenoxyacetic acid
- Kn
Kinetin
- LS
Linsmaier and Skoog (1965)
- MS
Murashige and Skoog (1962) 相似文献
388.
In this piece of work, microwave-assisted conversion of a natural precursor in to high-valued nano-scale material was carried out by a completely greener method. The fluorescent carbon dots prepared, designated as long pepper derived carbon dots (LPCDs), have been thoroughly characterized to explore the physical and chemical properties. The system exhibits excitation dependent emission behavior and from the optimal studies the excitation and emission wavelength of the system was found to be 330 nm and 455 nm respectively. On account of the superior fluorescent behavior of the LPCDs, it was successfully employed as a fluorescent sensing probe to detect Sudan I with good level of selectivity and sensitivity. This carcinogenic dye extensively used as food adulterant can impart several health issues. Food product safety is of high concern, therefore a simple facile and economical analytical method was proposed based on the fluorescence of LPCDs for this dye detection with satisfactory statistical parameters. A linear relationship was maintained in the range of 0 to 27.27 μM Sudan I with limit of detection of 0.92 μM. The quenching mechanism was studied and finally attributed to Förster resonance energy transfer (FRET) mechanism. In addition, the probe was effectively implemented for Sudan I detection in commercial chili powder samples with good level of recovery parameters. 相似文献
389.
Sharada Gullapalli Vidya Shivaswamy T. Ramasarma C. K. Ramakrishna Kurup 《Molecular and cellular biochemistry》1989,90(2):155-164
Summary Mitochondria isolated from the livers of rats administered with sodium meta-, ortho-, or polyvanadate, but not vanadyl sulphate, exhibited enhanced Ca2+ — stimulated respiration and uptake of calcium. These effects were shown also by mitochondria isolated from livers perfused with polyvanadate. The concentration of acid-soluble calcium decreased significantly in the mitochondrial fraction on vanadate treatment, while that in the cytosol showed a corresponding increase. Phenoxybenzamine, an antagonist to a-adrenergic receptors, effectively inhibited vanadate-induced Ca2+ mobilization, but surgical sympathectomy was without effect. This is the first demonstration of vanadate mimicking -adrenergic agonists in vivo. 相似文献
390.