全文获取类型
收费全文 | 549篇 |
免费 | 26篇 |
出版年
2024年 | 1篇 |
2023年 | 7篇 |
2022年 | 8篇 |
2021年 | 16篇 |
2020年 | 13篇 |
2019年 | 6篇 |
2018年 | 17篇 |
2017年 | 14篇 |
2016年 | 19篇 |
2015年 | 29篇 |
2014年 | 34篇 |
2013年 | 68篇 |
2012年 | 55篇 |
2011年 | 43篇 |
2010年 | 15篇 |
2009年 | 26篇 |
2008年 | 39篇 |
2007年 | 26篇 |
2006年 | 19篇 |
2005年 | 24篇 |
2004年 | 20篇 |
2003年 | 17篇 |
2002年 | 15篇 |
2001年 | 4篇 |
2000年 | 2篇 |
1999年 | 6篇 |
1998年 | 5篇 |
1997年 | 2篇 |
1996年 | 4篇 |
1995年 | 1篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1989年 | 2篇 |
1988年 | 2篇 |
1987年 | 3篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1975年 | 2篇 |
1974年 | 2篇 |
1971年 | 1篇 |
1967年 | 1篇 |
排序方式: 共有575条查询结果,搜索用时 187 毫秒
91.
92.
Harshad S. Ugamraj Kevin Dang Laure-Hlne Ouisse Benjamin Buelow Eduardo N. Chini Giulia Castello James Allison Starlynn C Clarke Laura M. Davison Roland Buelow Rong Deng Suhasini Iyer Ute Schellenberger Sankar N. Manika Shipra Bijpuria Astrid Musnier Anne Poupon Maria Cristina Cuturi Wim van Schooten Pranjali Dalvi 《MABS-AUSTIN》2022,14(1)
93.
94.
Wang Y Kim JA Cheong YH Joshi Y Koh YJ Hur JS 《Journal of microbiology (Seoul, Korea)》2011,49(3):473-480
The reducing polyketide synthases found in filamentous fungi are involved in the biosynthesis of many drugs and toxins. Lichens
produce bioactive polyketides, but the roles of reducing polyketide synthases in lichens remain to be clearly elucidated.
In this study, a reducing polyketide synthase gene (U1PKS3) was isolated and characterized from a cultured mycobiont of Usnea longissima. Complete sequence information regarding U1PKS3 (6,519 bp) was obtained by screening a fosmid genomic library. A U1PKS3 sequence
analysis suggested that it contains features of a reducing fungal type I polyketide synthase with β-ketoacyl synthase (KS),
acyltransferase (AT), dehydratase (DH), enoyl reductase (ER), ketoacyl reducatse (KR), and acyl carrier protein (ACP) domains.
This domain structure was similar to the structure of ccRadsl, which is known to be involved in resorcylic acid lactone biosynthesis
in Chaetomium chiversii. The results of phylogenetic analysis located U1PKS3 in the clade of reducing polyketide synthases. RT-PCR analysis results
demonstrated that UIPKS3 had six intervening introns and that UIPKS3 expression was upregulated by glucose, sorbitol, inositol, and mannitol. 相似文献
95.
Madhuri S. Salker Jaya Nautiyal Jennifer H. Steel Zoe Webster Sandra ?u?urovi? Marilena Nicou Yogesh Singh Emma S. Lucas Keisuke Murakami Yi-Wah Chan Sean James Yazan Abdallah Mark Christian B. Anne Croy Biserka Mulac-Jericevic Siobhan Quenby Jan J. Brosens 《PloS one》2012,7(12)
Decidualization renders the endometrium transiently receptive to an implanting blastocyst although the underlying mechanisms remain incompletely understood. Here we show that human endometrial stromal cells (HESCs) rapidly release IL-33, a key regulator of innate immune responses, upon decidualization. In parallel, differentiating HESCs upregulate the IL-33 transmembrane receptor ST2L and other pro-inflammatory mediators before mounting a profound anti-inflammatory response that includes downregulation of ST2L and increased expression of the soluble decoy receptor sST2. We demonstrate that HESCs secrete factors permissive of embryo implantation in mice only during the pro-inflammatory phase of the decidual process. IL-33 knockdown in undifferentiated HESCs was sufficient to abrogate this pro-inflammatory decidual response. Further, sequential activation of the IL-33/ST2L/sST2 axis was disordered in decidualizing HESCs from women with recurrent pregnancy loss. Signals from these cultures prolonged the implantation window but also caused subsequent pregnancy failure in mice. Thus, Il-33/ST2 activation in HESCS drives an autoinflammatory response that controls the temporal expression of receptivity genes. Failure to constrain this response predisposes to miscarriage by allowing out-of-phase implantation in an unsupportive uterine environment. 相似文献
96.
Rosi Bissinger Elisabeth Lang Irene Gonzalez-Menendez Leticia Quintanilla-Martinez Mehrdad Ghashghaeinia Lisann Pelzl Basma Sukkar Abdulla Al Mamun Bhuyan Madhuri S. Salker Yogesh Singh Birgit Fehrenbacher Hajar Fakhri Anja T. Umbach Martin Schaller Syed M. Qadri Florian Lang 《Apoptosis : an international journal on programmed cell death》2018,23(11-12):641-650
97.
Yogesh Bhattarai Brianna B. Williams Eric J. Battaglioli Weston R. Whitaker Lisa Till Madhusudan Grover David R. Linden Yasutada Akiba Karunya K. Kandimalla Nicholas C. Zachos Jonathan D. Kaunitz Justin L. Sonnenburg Michael A. Fischbach Gianrico Farrugia Purna C. Kashyap 《Cell host & microbe》2018,23(6):775-785.e5
98.
Sandeep A. Walujkar Shreyas V. Kumbhare Nachiket P. Marathe Dhrati V. Patangia Parimal S. Lawate Renu S. Bharadwaj Yogesh S. Shouche 《World journal of microbiology & biotechnology》2018,34(6):76
Dysbiosis of intestinal microflora has been postulated in ulcerative colitis (UC), which is characterized by imbalance of mucosal tissue associated bacterial communities. However, the specific changes in mucosal microflora during different stages of UC are still unknown. The aim of the current study was to investigate the changes in mucosal tissue associated microbiota during acute exacerbations and remission stages of UC. The mucosal microbiota associated with colon biopsy of 12 patients suffering from UC (exacerbated stage) and the follow-up samples from the same patients (remission stage) as well as non-IBD subjects was studied using 16S rRNA gene-based sequencing and quantitative PCR. The total bacterial count in patients suffering from exacerbated phase of UC was observed to be two fold lower compared to that of the non-IBD subjects (p?=?0.0049, Wilcox on matched-pairs signed rank tests). Bacterial genera including Stenotrophomonas, Parabacteroides, Elizabethkingia, Pseudomonas, Micrococcus, Ochrobactrum and Achromobacter were significantly higher in abundance during exacerbated phase of UC as compared to remission phase. The alterations in bacterial diversity with an increase in the abnormal microbial communities signify the extent of dysbiosis in mucosal microbiota in patients suffering from UC. Our study helps in identifying the specific genera dominating the microbiota during the disease and thus lays a basis for further investigation of the possible role of these bacteria in pathogenesis of UC. 相似文献
99.
Sandeep Rana Yogesh A. Sonawane Margaret A. Taylor Smitha Kizhake Muhammad Zahid Amarnath Natarajan 《Bioorganic & medicinal chemistry letters》2018,28(23-24):3736-3740
We synthesized a library of aminopyrazole analogs to systematically explore the hydrophobic pocket adjacent to the hinge region and the solvent exposed region of cyclin dependent kinases. Structure-activity relationship studies identified an optimal substitution for the hydrophobic pocket and analog 24 as a potent and selective CDK2/5 inhibitor. 相似文献
100.
Niggula Praveen Kumar Yogesh Vanjari Sowjanya Thatikonda Venkatesh Pooladanda Pankaj Sharma Balasubramanian Sridhar Chandraiah Godugu Ahmed Kamal Nagula Shankaraiah 《Bioorganic & medicinal chemistry letters》2018,28(22):3564-3573
A facile method for the construction of double bond between 3-ylidene oxindoles and α-azido ketones has been successfully accomplished with a mild base. This method features azido reduction with concomitant double bond formation to provide the new class of bioactive enamino-2-oxindoles. These new compounds were screened for their in vitro cytotoxic potential on selected human cancer cell lines such as colon, lung, breast, and cervical cancer cells. Among them, representative compounds 3a, 3h, 3k, 3p, 3w and 3x showed notable cytotoxicity profile with IC50 values ranging from 1.40?±?0.10 to 28.7?±?0.36?µM. Compound 3k displayed most potent cytotoxicity against lung cancer (NCI-H460) cells with an IC50 value of 1.40?±?0.10?µM. 3k also arrested the G2/M phase of the cell cycle and induced distinctive apoptotic features on lung cancer cells. The apoptosis induction is supported by various cellular assays such as AO/EB, DAPI, and DCFDA staining studies including clonogenic assay. Extent of apoptosis was also analyzed by Annexin binding and JC-1 staining. Moreover, this method is amenable for the generation of a library of new class of stable bioactive enamino-2-oxindoles. 相似文献