全文获取类型
收费全文 | 1506篇 |
免费 | 82篇 |
国内免费 | 63篇 |
专业分类
耳鼻咽喉 | 17篇 |
儿科学 | 67篇 |
妇产科学 | 26篇 |
基础医学 | 251篇 |
口腔科学 | 44篇 |
临床医学 | 147篇 |
内科学 | 371篇 |
皮肤病学 | 42篇 |
神经病学 | 42篇 |
特种医学 | 102篇 |
外国民族医学 | 3篇 |
外科学 | 102篇 |
综合类 | 26篇 |
预防医学 | 169篇 |
眼科学 | 27篇 |
药学 | 71篇 |
中国医学 | 42篇 |
肿瘤学 | 102篇 |
出版年
2023年 | 8篇 |
2022年 | 24篇 |
2021年 | 31篇 |
2020年 | 13篇 |
2019年 | 41篇 |
2018年 | 45篇 |
2017年 | 33篇 |
2016年 | 29篇 |
2015年 | 27篇 |
2014年 | 56篇 |
2013年 | 68篇 |
2012年 | 63篇 |
2011年 | 87篇 |
2010年 | 63篇 |
2009年 | 52篇 |
2008年 | 67篇 |
2007年 | 101篇 |
2006年 | 66篇 |
2005年 | 56篇 |
2004年 | 43篇 |
2003年 | 47篇 |
2002年 | 54篇 |
2001年 | 52篇 |
2000年 | 37篇 |
1999年 | 40篇 |
1998年 | 43篇 |
1997年 | 47篇 |
1996年 | 29篇 |
1995年 | 23篇 |
1994年 | 31篇 |
1993年 | 23篇 |
1992年 | 15篇 |
1991年 | 18篇 |
1990年 | 14篇 |
1989年 | 30篇 |
1988年 | 21篇 |
1987年 | 18篇 |
1986年 | 9篇 |
1985年 | 17篇 |
1984年 | 12篇 |
1983年 | 4篇 |
1982年 | 13篇 |
1981年 | 12篇 |
1980年 | 9篇 |
1979年 | 4篇 |
1978年 | 8篇 |
1977年 | 10篇 |
1976年 | 12篇 |
1975年 | 4篇 |
1972年 | 4篇 |
排序方式: 共有1651条查询结果,搜索用时 15 毫秒
1.
Non odontogenic epithelial cyst, again called fissurary cyst, are dysembryophasic cyst of maxillary, they are born throughout the sutures line of faces. Their diagnosis is raising again association of clinic symptom, especially complementary examination and in particular dental vitality test. Their treatment is surgical. Around 14 cysts fissurary have been recorded in a seven-year period. 相似文献
2.
Balloon dacryocystoplasty: indications and contraindications 总被引:3,自引:0,他引:3
3.
B Diallo R Vanhaelen-Fastre M Vanhaelen C Fiegel M Joyeux A Roland J Fleurentin 《Journal of ethnopharmacology》1992,36(2):137-142
The hepatoprotective activity of the rhisome of Cochlospermum tinctorium was investigated using carbon tetrachloride toxicity on mouse and tert-butyl hydroperoxide in vitro induction of lipid peroxidation and hepatocyte lysis. Aqueous, hydro-ethanolic and ethanolic extracts showed significant dose-dependent hepatoprotective actions. The ethanolic extract showed a hepatoprotective activity at lower doses than silymarin. The ethanolic and hydro-ethanolic extracts exhibited remarkable effects against the induction of lipid peroxidation and hepatocyte lysis; the aqueous extract showed comparatively weaker effects. These differences were related to the chemical composition of the extracts. Among the identified constituents of the drug, phenolic and polyphenolic compounds (gallic and ellagic acids, ellagitannins, flavonoids), carotenoids, triterpenes could be related to the biological activity. 相似文献
4.
A. Habluetzel D. A. Diallo F. Esposito L. Lamizana F. Pagnonl C. Lengeler C. Traoré S. N. Cousens 《Tropical medicine & international health : TM & IH》1997,2(9):855-862
To evaluate whether insecticide-treated netting (ITN) reduces child mortality in different epidemiological settings, 4 large, randomized, controlled trials were conducted in Africa. Here we report the findings from the trial in Burkina Faso, in an area of hyperendemic and markedly seasonal malaria transmission. The trial involved 158 villages, with a total population of some 90,000, grouped into 16 geographical clusters. Ascertainment of mortality among children aged 6–59 months began in early 1993. In June/July 1994, 8 of the clusters, randomly selected, received permethrin-treated curtains. Follow-up of children and ascertainment of mortality continued until May 1996. A 15% reduction in all-cause mortality among children aged 6–59 months was observed over the 2-year period following the installation of the curtains (95% c.i. – 4% to 30%). In the first year, post-intervention mortality was substantially lower in the clusters receiving curtains compared with the control clusters (rate ratio = 0.74; 95% c.i. 0.57, 0.95) but in the second year, there was no difference between mortality in the two groups (rate ratio = 0.99). The overall two-year impact of the intervention is consistent with the impacts observed in other trials which have demonstrated reductions in child mortality of from 17% to 33%. However, the year-by-year analysis raises some concerns about the long-term effect of ITN. Further follow-up of this population is warranted. 相似文献
5.
6.
Duncan WC; Illingworth PJ; Young FM; Fraser HM 《Human reproduction (Oxford, England)》1998,13(9):2532-2540
The molecular mechanisms involved in luteolysis are still unclear in the
primate. This study aimed to investigate the effect of induced luteolysis
on the ovarian luteinizing hormone (LH) receptor and the steroidogenic
enzyme, 3beta-hydroxysteroid dehydrogenase (3beta-HSD) in the marmoset
monkey. Luteolysis was induced in the mid-luteal phase either directly by
systemic prostaglandin F2alpha (PGF2alpha), or indirectly by LH withdrawal
using systemic gonadotrophin releasing hormone antagonist (GnRHant)
treatment. The LH receptor was studied by isotopic mRNA in-situ
hybridization and in-situ ligand binding and 3beta-HSD expression was
studied using isotopic mRNA in-situ hybridization and immunohistochemistry.
Induced luteolysis was associated with a reduction in the expression of LH
receptor (P < 0.0001) and 3beta-HSD mRNA, closely followed by a
reduction in the LH receptor (P < 0.05) and 3beta-HSD protein
concentrations within 24 h. There were no differences in the findings
whether luteolysis was induced with PGF2alpha or GnRHant. This study shows
that disparate mechanisms to induce luteolysis in the primate result in an
identical rapid loss of the LH receptor and 3beta-HSD. In conclusion,
induced luteolysis leads to rapid loss of the steroidogenic pathway in
luteal cells.
相似文献
7.
Arbovirus surveillance from 1990 to 1995 in the Barkedji area (Ferlo) of Senegal, a possible natural focus of Rift Valley fever virus 总被引:1,自引:0,他引:1
Traoré-Lamizana M Fontenille D Diallo M Bâ Y Zeller HG Mondo M Adam F Thonon J Maïga A 《Journal of medical entomology》2001,38(4):480-492
Surveillance for mosquito-borne viruses was conducted in Barkedji area from 1990 to 1995, following an outbreak of Rift Valley fever (RVF) virus in southern Mauritania. Mosquitoes, sand flies, and midges were collected from human bait and trapped by solid-state U.S. Army battery-powered CDC miniature light traps baited with dry ice or animals (sheep or chickens) at four ponds. Overall, 237,091 male and female mosquitoes representing 52 species in eight genera, 214,967 Phlebotomine sand flies, and 2,527 Culicoides were collected, identified, and tested for arboviruses in 9,490 pools (7,050 pools of female and 331 of male mosquitoes, 2,059 pools of sand flies and 50 pools of Culicoides). Viruses isolated included one Alphavirus, Babanki (BBK); six Flaviviruses, Bagaza (BAG), Ar D 65239, Wesselsbron (WSL), West Nile (WN), Koutango (KOU), Saboya (SAB); two Bunyavirus, Bunyamwera (BUN) and Ngari (NRI); two Phleboviruses, Rift Valley fever (RVF) and Gabek Forest (GF); one Orbivirus, Ar D 66707 (Sanar); one Rhabdovirus, Chandipura (CHP); and one unclassified virus, Ar D 95537. Based on repeated isolations, high field infection rates and abundance, Culex appeared to be the vectors of BAG, BBK, Ar D 65239 (BAG-like), and WN viruses, Ae. vexans and Ae. ochraceus of RVF virus, Mansonia of WN and BAG viruses, Mimomyia of WN and BAG viruses, and Phlebotomine of SAB, CHP, Ar D 95537, and GF viruses. Our data indicate that RVF virus circulated repeatedly in the Barkedji area. 相似文献
8.
HM Clink 《Journal of clinical pathology》1980,33(8):799-800
9.
10.