全文获取类型
收费全文 | 2447篇 |
免费 | 0篇 |
国内免费 | 1篇 |
专业分类
化学工业 | 10篇 |
金属工艺 | 1篇 |
机械仪表 | 2篇 |
建筑科学 | 10篇 |
能源动力 | 4篇 |
轻工业 | 5篇 |
水利工程 | 2篇 |
无线电 | 2篇 |
一般工业技术 | 8篇 |
冶金工业 | 2390篇 |
原子能技术 | 1篇 |
自动化技术 | 13篇 |
出版年
2020年 | 1篇 |
2019年 | 1篇 |
2018年 | 1篇 |
2016年 | 1篇 |
2014年 | 2篇 |
2013年 | 3篇 |
2012年 | 3篇 |
2011年 | 5篇 |
2009年 | 2篇 |
2008年 | 3篇 |
2007年 | 6篇 |
2006年 | 7篇 |
2005年 | 2篇 |
2004年 | 1篇 |
2003年 | 2篇 |
2002年 | 1篇 |
2000年 | 2篇 |
1999年 | 77篇 |
1998年 | 715篇 |
1997年 | 447篇 |
1996年 | 279篇 |
1995年 | 148篇 |
1994年 | 132篇 |
1993年 | 147篇 |
1992年 | 13篇 |
1991年 | 23篇 |
1990年 | 24篇 |
1989年 | 27篇 |
1988年 | 24篇 |
1987年 | 19篇 |
1986年 | 16篇 |
1985年 | 17篇 |
1983年 | 5篇 |
1982年 | 16篇 |
1981年 | 8篇 |
1980年 | 27篇 |
1979年 | 3篇 |
1978年 | 11篇 |
1977年 | 64篇 |
1976年 | 156篇 |
1975年 | 4篇 |
1970年 | 1篇 |
1964年 | 1篇 |
1955年 | 1篇 |
排序方式: 共有2448条查询结果,搜索用时 0 毫秒
131.
We report a case of neurosarcoidosis, which simulated a cerebral tumor located at the floor of the III ventricle, associated to an aseptic meningitis and diabetes insipidus. It was the first and only manifestation of the illness. The response to steroid therapy was very favourable, with complete clinical recuperation and radiological resolution. 相似文献
132.
133.
134.
JM Jürgensmeier S Krajewski RC Armstrong GM Wilson T Oltersdorf LC Fritz JC Reed S Ottilie 《Canadian Metallurgical Quarterly》1997,8(2):325-339
The dental profession faces educational, scientific, and ethical challenges in orofacial pain and headache. Past educational deficiencies are being addressed with guidance and recommendations from the AADS, the ADA, and the AAOP. With education and further research, many dental ethical questions in TMD will be resolved. The educational process must continue with a solid foundation in scientific basis provided in university settings. The appropriate use of TMD diagnostic machines, treatment modalities, and management of perpetuating factors such as sleep will evolve with the new knowledge of scientific discovery. These are some of the many challenges of orofacial pain and headache disorders that warrant special consideration. 相似文献
135.
136.
In prokaryotes, DnaK-DnaJ chaperon is involved in the protein degradation catalyzed by proteases La and ClpA/B complex as shown in E. coli. To extend this into eukaryotic cells, we examined the effects of hsp70 genes, SSA1 and SSB1, and DnaJ genes, SIS1 and YDJ1, on the growth of proteasome subunit mutants of the yeast S. cerevisiae. The results identified SSB1 and SIS1 as a pair of chaperon genes specifically involved in efficient protein turnover in the yeast, whose overexpression suppressed the growth defects caused by the proteasome mutations. Moreover, a single amino acid substitution in the putative peptide-binding site of SSB1 protein profoundly enhanced the suppression activity, indicating that the activity is mediated by the peptide-binding activity of this chaperon. Thus SSB1, with its partner DnaJ, SIS1, modulates the efficiency of protein turnover through its chaperon activity. 相似文献
137.
138.
139.
GM Birch T Black SK Malcolm MT Lai RE Zimmerman SR Jaskunas 《Canadian Metallurgical Quarterly》1995,6(5):609-618
A physiologically relevant thrombopoietin (TPO) must be a humoral regulator with lineage specificity for megakaryocytes and their precursors. It should be capable of stimulating platelet production in normal animals, and elevated levels of TPO should be detectable in the plasma following acute, severe thrombocytopenia. Acute thrombocytopenia provides a model system that is likely to predict the effects of TPO, since many of the effects on megakaryocytes and platelets observed after induction of acute thrombocytopenia would be mediated by TPO. Important questions remain to be answered. Do the currently available data for the c-Mpl ligand explain previously published data that describe elevated levels of Meg-CSF in the circulation following production of bone marrow aplasia? Does the c-Mpl ligand account for all of the megakaryocyte stimulatory factors that have been described? Is there another factor that accounts for at least some of the acute alterations in megakaryocytopoiesis that occur immediately following a decrease in platelet levels? 相似文献
140.
V Kamath CN Jones JC Yip BB Varasteh AH Cincotta GM Reaven YD Chen 《Canadian Metallurgical Quarterly》1997,20(11):1697-1701
OBJECTIVE: To assess the effect on various aspects of carbohydrate and lipid metabolism of administering a quick-release formulation of bromocriptine (Ergoset) to obese, nondiabetic, hyperinsulinemic women. RESEARCH DESIGN AND METHODS: Hourly concentrations of prolactin, glucose, insulin, free fatty acid (FFA), and triglyceride were measured for 24 h before and after approximately 8 weeks of treatment with Ergoset. In addition, fasting lipid and lipoprotein concentrations and the steady-state plasma glucose (SSPG) concentration in response to a continuous infusion of somatostatin, insulin, and glucose were determined before and after Ergoset administration. RESULTS: Circulating prolactin concentrations were dramatically decreased (P < 0.001) following treatment, associated with a significant fall (P < 0.05) in 24-h-long plasma glucose, FFA, and triglyceride concentrations. Neither circulating plasma insulin concentrations nor the ability of insulin to mediate glucose disposal changed with treatment. Finally, fasting total cholesterol fell (P < 0.05) and the ratio of total to HDL cholesterol decreased (P = 0.06) in association with Ergoset treatment. CONCLUSIONS: The fact that significant metabolic improvement was seen in the obese nondiabetic hyperinsulinemic women studied suggests that Ergoset could be of therapeutic benefit in clinical conditions of hyperglycemia and/or dyslipidemia. 相似文献