全文获取类型
收费全文 | 403篇 |
免费 | 17篇 |
专业分类
420篇 |
出版年
2023年 | 5篇 |
2022年 | 16篇 |
2021年 | 26篇 |
2020年 | 11篇 |
2019年 | 19篇 |
2018年 | 14篇 |
2017年 | 9篇 |
2016年 | 11篇 |
2015年 | 16篇 |
2014年 | 18篇 |
2013年 | 31篇 |
2012年 | 32篇 |
2011年 | 59篇 |
2010年 | 17篇 |
2009年 | 14篇 |
2008年 | 15篇 |
2007年 | 18篇 |
2006年 | 18篇 |
2005年 | 12篇 |
2004年 | 14篇 |
2003年 | 16篇 |
2002年 | 12篇 |
2001年 | 6篇 |
2000年 | 1篇 |
1998年 | 3篇 |
1997年 | 1篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1987年 | 1篇 |
1977年 | 1篇 |
排序方式: 共有420条查询结果,搜索用时 15 毫秒
351.
352.
The β-sheet of muscle fatty acid binding protein of Locusta migratoria (Lm-FABP) was modeled by employing 2-D NMR data and the Rigid Body Assembly method. The model shows the β-sheet to comprise ten β-strands arranged anti-parallel to each other. There is a β-bulge between Ser 13 and Gln 14 which is a difference from the published structure of β-sheet of bovine heart Fatty Acid Binding Protein. Also, a hydrophobic patch consisting of Ile 45, Phe 51, Phe 64 and Phe 66 is present on the surface which is characteristic of most Fatty Acid Binding Proteins. A “gap” is present between βD and βE that provides evidence for the presence of a portal or opening between the polypeptide chains which allows ligand fatty acids to enter the protein cavity and bind to the protein. 相似文献
353.
Fahim H Jafary Sohail A Khan Haresh Kumar Numaan F Malik Khawar A Kazmi Sajid Dhakam Azam Shafquat Aamir Hameed Javed Tai Najaf Nadeem 《BMC cardiovascular disorders》2004,4(1):1-5
Background
In most western countries 20% of adults have hypertension. Reports in the literature suggest that from 31 to 86% of treated patients are not at recommended target levels. However it is important to consider how we are determining whether targets are unmet and the degree to which they are unmet. Our underlying hypothesis is that white coat effect is partially responsible for the reported low rates of control of hypertension by primary care practitioners.Methods
The study population consists of 1142 patients who are being assessed for enrolment in two community-based randomized controlled trials. Patients must have essential hypertension, be on antihypertensive medication, and must not have met their blood pressure targets. We are reporting on the proportion of patients who have not achieved target, and the degree to which they have not achieved their target. We also report on the mean daytime blood pressures on 24 hour ABPM and compare these to mean blood pressures found on the patients' charts.Results
We identified 3284 patient charts of patients with hypertension. Of these, 1142 were determined to be "out of control" (did not achieve target) and 436 agreed to undergo 24 hour ABPM for final determination of eligibility. Overwhelmingly (95.8% of the time) it was the systolic blood pressure that was not under control. However, most of the patients who had not achieved target according to our criteria were within 10 mmHg of the recommended targets. Isolated systolic blood pressure was the best predictor of elevated mean daytime blood pressure on 24 hour ABPM.Conclusions
At least 35% of patients had not achieved target blood pressure levels and this is primarily due to lack of control of systolic blood pressure. The best predictor of continuing hypertension on 24 hour ABPM was the mean systolic blood pressure on the patients chart. However, only 69% of patients who were uncontrolled according blood pressures recorded in the chart were uncontrolled according to 24 hour ABPM criteria. This suggests that the white coat effect makes blood pressure measurements in the doctor's offices, at least as currently done, not sufficiently accurate for determining treatment endpoint. 相似文献354.
Afzaal Muhammad Saeed Farhan Arshad Muhammad Umair Nadeem Muhammad Tahir Saeed Muhammad Tufail Tabussam 《Probiotics and antimicrobial proteins》2019,11(4):1348-1354
Probiotics and Antimicrobial Proteins - The objective of this work was to explore the effect of two encapsulating polysaccharides (sodium alginate and carrageenan) on the viability of probiotic... 相似文献
355.
356.
Si Lhyam Myint Nikola Zlatkov Kyaw Min Aung Eric Toh Annika Sjöström Aftab Nadeem Marylise Duperthuy Bernt Eric Uhlin Sun Nyunt Wai 《Biochimica et Biophysica Acta (BBA)/General Subjects》2021,1865(7):129912
BackgroundA prevailing action of the Type VI secretion system (T6SS) in several Gram-negative bacterial species is inter-bacterial competition. In the past several years, many effectors of T6SS were identified in different bacterial species and their involvement in inter-bacterial interactions were described. However, possible defence mechanisms against T6SS attack among prey bacteria were not well clarified yet.MethodsEscherichia coli was assessed for susceptibility to T6SS-mediated killing by Vibrio cholerae. TheT6SS-mediated bacterial killing assays were performed in absence or presence of different protease inhibitors and with different mutant E. coli strains. Expression levels of selected proteins were monitored using SDS-PAGE and immunoblot analyses.ResultsThe T6SS-mediated killing of E. coli by V. cholerae was partly blocked when the serine protease inhibitor Pefabloc was present. E. coli lacking the periplasmic protease inhibitor Ecotin showed enhanced susceptibility to killing by V. cholerae. Mutations affecting E. coli membrane stability also caused increased susceptibility to killing by V. cholerae. E. coli lacking the maltodextrin porin protein LamB showed reduced susceptibility to killing by V. cholerae whereas E. coli with induced high levels of LamB showed reduced survival in inter-bacterial competition.ConclusionsOur study identified two proteins in E. coli, the intrinsic protease inhibitor Ecotin and the outer membrane porin LamB, that influenced E. coli susceptibility to T6SS-mediated killing by V. cholerae.General significanceWe envision that it is feasible to explore these findings to target and modulate their expression to obtain desired changes in inter-bacterial competition in vivo, e.g. in the gastrointestinal microbiome. 相似文献
357.
358.
Siddiqui N Pandeya SN Khan SA Stables J Rana A Alam M Arshad MF Bhat MA 《Bioorganic & medicinal chemistry letters》2007,17(1):255-259
A series of sulphonamide derivatives (1-11) were synthesized in good yield and evaluated for their possible anticonvulsant activity and neurotoxic study. The structures of the synthesized compounds were confirmed on the basis of their spectral data and elemental analysis. Majority of the compounds were active in MES and scPTZ tests. All the compounds were less toxic than the standard drug phenytoin. 相似文献
359.
BioControl - Rice bakanae disease, caused by Fusarium fujikoroi, is an economically important disease that poses a threat to rice cultivation. It causes serious yield losses quantitatively and... 相似文献
360.
Nan Zhong Peter Loppnau Alma Seitova Mani Ravichandran Maria Fenner Harshika Jain Anandi Bhattacharya Ashley Hutchinson Marcin Paduch Vincent Lu Michal Olszewski Anthony A. Kossiakoff Evan Dowdell Akiko Koide Shohei Koide Haiming Huang Vincent Nadeem Sachdev S. Sidhu Jack F. Greenblatt Edyta Marcon Cheryl H. Arrowsmith Aled M. Edwards Susanne Gr?slund 《PloS one》2015,10(10)
We developed and optimized a high-throughput project workflow to generate renewable recombinant antibodies to human proteins involved in epigenetic signalling. Three different strategies to produce phage display compatible protein antigens in bacterial systems were compared, and we found that in vivo biotinylation through the use of an Avi tag was the most productive method. Phage display selections were performed on 265 in vivo biotinylated antigen domains. High-affinity Fabs (<20nM) were obtained for 196. We constructed and optimized a new expression vector to produce in vivo biotinylated Fabs in E. coli. This increased average yields up to 10-fold, with an average yield of 4 mg/L. For 118 antigens, we identified Fabs that could immunoprecipitate their full-length endogenous targets from mammalian cell lysates. One Fab for each antigen was converted to a recombinant IgG and produced in mammalian cells, with an average yield of 15 mg/L. In summary, we have optimized each step of the pipeline to produce recombinant antibodies, significantly increasing both efficiency and yield, and also showed that these Fabs and IgGs can be generally useful for chromatin immunoprecipitation (ChIP) protocols. 相似文献