全文获取类型
收费全文 | 397篇 |
免费 | 18篇 |
国内免费 | 12篇 |
专业分类
电工技术 | 3篇 |
综合类 | 12篇 |
化学工业 | 8篇 |
金属工艺 | 7篇 |
机械仪表 | 7篇 |
建筑科学 | 2篇 |
矿业工程 | 2篇 |
能源动力 | 3篇 |
轻工业 | 30篇 |
水利工程 | 5篇 |
石油天然气 | 6篇 |
无线电 | 15篇 |
一般工业技术 | 7篇 |
冶金工业 | 297篇 |
原子能技术 | 4篇 |
自动化技术 | 19篇 |
出版年
2022年 | 2篇 |
2020年 | 1篇 |
2019年 | 2篇 |
2018年 | 2篇 |
2017年 | 5篇 |
2015年 | 1篇 |
2014年 | 4篇 |
2013年 | 4篇 |
2012年 | 8篇 |
2011年 | 7篇 |
2010年 | 6篇 |
2009年 | 7篇 |
2008年 | 8篇 |
2007年 | 8篇 |
2006年 | 4篇 |
2005年 | 10篇 |
2004年 | 7篇 |
2003年 | 3篇 |
2002年 | 14篇 |
2001年 | 5篇 |
2000年 | 2篇 |
1999年 | 5篇 |
1998年 | 70篇 |
1997年 | 56篇 |
1996年 | 40篇 |
1995年 | 20篇 |
1994年 | 15篇 |
1993年 | 20篇 |
1992年 | 5篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1988年 | 5篇 |
1987年 | 1篇 |
1983年 | 1篇 |
1982年 | 3篇 |
1980年 | 5篇 |
1978年 | 2篇 |
1977年 | 12篇 |
1976年 | 49篇 |
1975年 | 3篇 |
1973年 | 1篇 |
1971年 | 1篇 |
排序方式: 共有427条查询结果,搜索用时 8 毫秒
71.
72.
73.
74.
75.
76.
The elevation of intracellular levels of cyclic AMP by forskolin stimulation of adenylate cyclase regulates early and late phase neutrophil responses differentially. Early phase neutrophil responses as measured by shape change in response to chemotactic factors, transmigration across a polycarbonate membrane and priming were unaffected by forskolin-induced elevation of intracellular cAMP. Late phase neutrophil responses such as release of superoxide anions, activation of phospholipase A2 and platelet activating factor (PAF) synthesis were inhibited by increasing intracellular cAMP through the addition of 10 microM forskolin for 10 min prior to stimulation. N-Formyl-methionyl-leucyl-phenylalanine-stimulated arachidonic acid release fell from 9.3% (untreated cells) to 4.6% in forskolin-treated cells. PAF generation was also inhibited from 430 pg/10(6) cells in untreated cells to background levels in forskolin-treated cells (110 pg/10(6) cells). Also, the reduction of cytochrome c by superoxide anions fell from 4.2 nmol/10(6) cells in the absence of forskolin to 2.0 nmol/10(6) cells following forskolin treatment. These results indicate that in neutrophils the elevation of cAMP acts differentially on cellular responses, not affecting early activation events, but markedly inhibiting late events such as the release of inflammatory mediators. 相似文献
77.
The transformation of Trypanosoma cruzi epimastigotes to mammal-infective metacyclic trypomastigotes (metacyclogenesis) can be performed in vitro under chemically defined conditions (TAU 3AAG medium). During this process, changes in the nature of cell surface sugar composition and sugar distribution was evaluated using FITC and gold-labeled lectins and observed by flow cytometry and transmission electron microscopy. The pattern of labeling with the lectins from Triticum vulgaris (WGA), Arachis hypogaea (PNA), Limax flavus (LFA), Canavalia ensiformis (Con-A), and Ricinus communis (RCA-I) significantly changed during the metacyclogenic process. The results obtained are discussed in relation to the role played by T. cruzi cell surface carbohydrate residues on the process of parasite-host cell interaction. 相似文献
78.
79.
现场可编程门阵列FPGA(Field Programmable Gate Array)是新一代可编程ASIC器件,它综合了分立器件和大规模集成芯片的优点,在数字电路设计中应用极其广泛.在超声温度测量系统中,应用数字移相技术,结合现场可编程门阵列器件(FPGA)设计了一个高速计数器,实现燃烧气体温度的快速、准确测量. 相似文献
80.
MA Gorbunov LI Pavlova IA Titov TA Bektimirov VP Selezneva OIu Shitikova TV Mamontova IN Indikova 《Canadian Metallurgical Quarterly》1997,(6):55-58
The results of field clinical trials of Russian and American yeast vaccines against hepatitis B are presented. The study revealed that both vaccines were faintly reactogenic, safe and exhibited high immunological activity. After the full course of immunization following the schedule 0-1-2 months 92.5% and 97.5% of patients receiving, respectively. Russian vaccine "Combiotech" and American vaccine "H-B-Vax II" were found to have specific antibodies. The maximum effect was registered when the vaccines were introduced according to the schedule 0-1-6 months. Seroconversions were observed in 97.5% and 100% of the vaccinees receiving the Russian and American vaccines respectively, in the latter case the highest antibody level being observed. The use of the vaccines within the prophylactic immunization schedule showed that antibodies to hepatitis B appeared in immunized children in 93-100% of cases. Seroconversion indices and the levels of antibodies to diphtheria, tetanus, poliomyelitis and measles were statistically significant and were the same in children receiving only the vaccines according to the immunization schedule and in children immunized, in addition to these vaccines, against hepatitis B. 相似文献