全文获取类型
收费全文 | 673篇 |
免费 | 53篇 |
国内免费 | 1篇 |
专业分类
727篇 |
出版年
2023年 | 2篇 |
2022年 | 11篇 |
2021年 | 18篇 |
2020年 | 14篇 |
2019年 | 8篇 |
2018年 | 17篇 |
2017年 | 15篇 |
2016年 | 16篇 |
2015年 | 35篇 |
2014年 | 35篇 |
2013年 | 61篇 |
2012年 | 55篇 |
2011年 | 55篇 |
2010年 | 30篇 |
2009年 | 31篇 |
2008年 | 50篇 |
2007年 | 40篇 |
2006年 | 35篇 |
2005年 | 29篇 |
2004年 | 39篇 |
2003年 | 21篇 |
2002年 | 36篇 |
2001年 | 2篇 |
2000年 | 8篇 |
1999年 | 7篇 |
1998年 | 4篇 |
1997年 | 1篇 |
1996年 | 1篇 |
1995年 | 3篇 |
1994年 | 2篇 |
1993年 | 5篇 |
1992年 | 3篇 |
1991年 | 3篇 |
1990年 | 2篇 |
1989年 | 4篇 |
1988年 | 5篇 |
1987年 | 5篇 |
1986年 | 1篇 |
1985年 | 3篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1981年 | 2篇 |
1977年 | 1篇 |
1975年 | 1篇 |
1973年 | 1篇 |
1972年 | 1篇 |
1971年 | 1篇 |
1969年 | 2篇 |
1966年 | 1篇 |
1962年 | 2篇 |
排序方式: 共有727条查询结果,搜索用时 15 毫秒
721.
722.
Bidisha Mukherjee Madhurina Majumdar Amitava Gangopadhyay Sankar Chakraborty Debashish Chaterjee 《International journal of phytoremediation》2015,17(7):651-656
Phytoremediation is an emerging technology applied for treatment of wastewater. It is a suitable option notably in developing countries as it is simple, sustainable and cost effective. In the present lab-based batch study the free floating aquatic plant water lettuce (Pistia stratiotes) is used for treatment of parboiled rice mill wastewater having low pH, high chemical oxygen demand (COD), nitrogen, and phosphate. In raw rice mill wastewater (undiluted) growth of water lettuce is found to be inhibited. Later on, two different dilution approaches (raw and facultative pond effluent 1:1; raw and tap water 1:1) are applied in order to effectively use this technology. In all cases a control (without plant) is maintained to compare the performance with the Aquatic Plant based Treatment (APT) system. In the APT system results reveal that removal of soluble COD (SCOD), ammoniacal nitrogen (NH4-N), nitrate nitrogen (NO3-N), and soluble phosphorus (sol. P) are upto 65%, 98%, 70%, and 65% respectively. The study highlights the efficacy of water lettuce in removing organics and nutrients from parboiled rice mill wastewater. 相似文献
723.
Xiaoguang Li Dhiman Sankar Pal Debojyoti Biswas Pablo A Iglesias Peter N Devreotes 《The EMBO journal》2021,40(4)
The ability of cells to polarize and move toward external stimuli plays a crucial role in development, as well as in normal and pathological physiology. Migrating cells maintain dynamic complementary distributions of Ras activity and of the phospholipid phosphatidylinositol‐3,4‐bisphosphate (PI(3,4)P2). Here, we show that lagging‐edge component PI(3,4)P2 also localizes to retracting leading‐edge protrusions and nascent macropinosomes, even in the absence of phosphatidylinositol 3,4,5‐trisphosphate (PIP3). Once internalized, macropinosomes break up into smaller PI(3,4)P2‐enriched vesicles, which fuse with the plasma membrane at the rear of the cell. Subsequently, the phosphoinositide diffuses toward the front of the cell, where it is degraded. Computational modeling confirms that this cycle gives rise to stable back‐to‐front gradient. These results uncover a surprising “reverse‐fountain flow” of PI(3,4)P2 that regulates polarity. 相似文献
724.
Luciana Fachini Costa Ana L. Cabello Diego Felipe Alves Batista Sankar P. Chaki Paul de Figueiredo Tatiane Alves da Paixão Allison C. Rice-Ficht Thomas A. Ficht Renato Lima Santos 《Microbiology and immunology》2020,64(11):730-736
Brucellosis is a major zoonotic disease, and Brucella melitensis is the species most often associated with human infection. Vaccination is the most efficient tool for controlling animal brucellosis, with a consequent decrease of incidence of human infections. Commercially available live attenuated vaccines provide some degree of protection, but retain residual pathogenicity to human and animals. In this study, Brucella ovis ∆abcBA (Bo∆abcBA), a live attenuated candidate vaccine strain, was tested in two formulations (encapsulated with alginate and alginate plus vitelline protein B [VpB]) to immunize mice against experimental challenge with B. melitensis strain 16M. One week after infection, livers and spleens of immunized mice had reduced numbers of the challenge strain B. melitensis 16M when compared with those of nonimmunized mice, with a reduction of approximately 1-log10 of B. melitensis 16M count in the spleens from immunized mice. Moreover, splenocytes stimulated with B. melitensis antigens in vitro secreted IFN-γ when mice had been immunized with Bo∆abcBA encapsulated with alginate plus VpB, but not with alginate alone. Body and liver weights were similar among groups, although spleens from mice immunized with Bo∆abcBA encapsulated with alginate were larger than those immunized with Bo∆abcBA encapsulated with alginate plus VpB or nonimmunized mice. This study demonstrated that two vaccine formulations containing Bo∆abcBA protected mice against experimental challenge with B. melitensis. 相似文献
725.
726.
727.
Plasmonics - This work describes an ultrasensitive trace determination of cadmium ion in aqueous medium through hybrid nanocomposite. Biodegradable materials such as chitosan and PVA are used to... 相似文献