全文获取类型
收费全文 | 10655篇 |
免费 | 1049篇 |
国内免费 | 69篇 |
专业分类
耳鼻咽喉 | 120篇 |
儿科学 | 450篇 |
妇产科学 | 241篇 |
基础医学 | 1622篇 |
口腔科学 | 334篇 |
临床医学 | 923篇 |
内科学 | 2328篇 |
皮肤病学 | 293篇 |
神经病学 | 989篇 |
特种医学 | 469篇 |
外国民族医学 | 1篇 |
外科学 | 1534篇 |
综合类 | 82篇 |
一般理论 | 1篇 |
预防医学 | 801篇 |
眼科学 | 171篇 |
药学 | 667篇 |
中国医学 | 21篇 |
肿瘤学 | 726篇 |
出版年
2023年 | 57篇 |
2022年 | 114篇 |
2021年 | 248篇 |
2020年 | 168篇 |
2019年 | 250篇 |
2018年 | 350篇 |
2017年 | 257篇 |
2016年 | 274篇 |
2015年 | 304篇 |
2014年 | 375篇 |
2013年 | 520篇 |
2012年 | 582篇 |
2011年 | 566篇 |
2010年 | 409篇 |
2009年 | 349篇 |
2008年 | 453篇 |
2007年 | 475篇 |
2006年 | 499篇 |
2005年 | 433篇 |
2004年 | 402篇 |
2003年 | 322篇 |
2002年 | 343篇 |
2001年 | 330篇 |
2000年 | 311篇 |
1999年 | 274篇 |
1998年 | 193篇 |
1997年 | 182篇 |
1996年 | 179篇 |
1995年 | 155篇 |
1994年 | 142篇 |
1993年 | 87篇 |
1992年 | 218篇 |
1991年 | 197篇 |
1990年 | 175篇 |
1989年 | 194篇 |
1988年 | 175篇 |
1987年 | 140篇 |
1986年 | 133篇 |
1985年 | 127篇 |
1984年 | 105篇 |
1983年 | 67篇 |
1982年 | 60篇 |
1981年 | 45篇 |
1980年 | 48篇 |
1979年 | 65篇 |
1978年 | 38篇 |
1977年 | 37篇 |
1976年 | 41篇 |
1974年 | 40篇 |
1973年 | 35篇 |
排序方式: 共有10000条查询结果,搜索用时 640 毫秒
61.
62.
M Espada C Pedregal A Alonso C López L Salazar M M Martinez J L Guillén A R Martinez 《Il Farmaco; edizione pratica》1990,45(11):1237-1243
The synthesis of new N3-arylciclohexanespiroimidazolidine-2,4-diones, N3-arylciclohexanespiroimidazolidine-2-tio-4-ones and the 4-hydroxy derivatives is described and their structures discussed on the basis of I.R. and 1H-N.R.M. data. The anthelmintic activity of these compounds was tested. 相似文献
63.
64.
Student near-peer co-tutors in PBL groups 总被引:1,自引:0,他引:1
65.
66.
67.
M Durdu† S Gökçe‡ M Bagirova§ M Yalaz‡ AM Allahverdiyev§ S Uzun† 《Journal of the European Academy of Dermatology and Venereology》2007,21(2):214-218
OBJECTIVE: Although cutaneous leishmaniasis (CL) occurs mostly in the facial area, periocular involvement accounts for 2-5% of the facial lesions. CL lesions localized in the periocular region can easily be confused with various other diseases. The aim of this study was to examine the frequency of periocular involvement in CL in the Cukurova region of Turkey, as well as the clinical characteristics, diagnosis and methods of treatment of this disease. METHODS: Between December 1998 and December 2004, patients who were diagnosed with CL were evaluated prospectively with respect to periocular involvement. RESULTS: From the 2066 patients evaluated with CL, 2622 lesions were identified. In 59 (2.9%) of these patients, a total of 66 (2.5%) lesions were located in the periocular area. Thirty-two (48.5%) of these lesions were of the papular type, 15 (22.7%) the nodulo-ulcerative type, 10 (15.2%) the plaque type, and nine (13.6%) the nodular type. Dacryocystitis was identified in four patients with periocular involvement. Over the follow-up period, no ocular or periocular deformities or complications developed in these patients. CONCLUSION: Patients suspected of CL should be evaluated and treated early in the course of their disease to prevent any permanent ocular or periocular deformities. 相似文献
68.
69.
Reinaldo Figueroa MD Edilberto Martinez MD Raisa P. Fayngersh MD Hong Jiang MD Hatim A. Omar MD Nergesh Tejani MD Michael S. Wolin PhD 《American journal of obstetrics and gynecology》1995,173(6):1800-1806
OBJECTIVE: Our objective was to determine whether the observed relaxation to lactate and other agents in placental vessels of normal pregnancies is altered in severe preeclampsia.STUDY DESIGN: Isolated placental arteries and veins from women with severe preeclampsia and uncomplicated term pregnancies were precontracted with prostaglandin F2α under 5% oxygen and 5% carbon dioxide with the balance nitrogen (Po2 35 to 38 torr) and then exposed to lactate (1 to 10 mmol/L, pH 7.4, n = 8 to 15), arachidonic acid (0.01 to 10 μmol/L, n = 6 to 13), nitroglycerin (1 nmol to 1 μmol/L, n = 4 to 12), or forskolin (0.01 to 10 μmol/L, n = 6 to 9). The response to lactate was also examined in placental vessels from appropriate-for-gestational-age preterm deliveries (n = 8) for comparison with a similar group with severe preeclampsia (n = 8). The t test and analysis of variance statistics were used.RESULTS: Relaxation to lactate was markedly inhibited in both placental arteries and veins of women with severe preeclampsia compared with vessels from uncomplicated term or preterm pregnancies. Responses to the other relaxing agents were not altered in the severely preeclampsia vessels.CONCLUSIONS: In severe preeclampsia absence of lactate-induced dilatation of placental vessels may contribute to the fetal complications associated with impaired blood flow and vasospasm. 相似文献
70.
J.Martinez Calatayud C.Gomez Benito D.Gaspar Gimenez 《Journal of pharmaceutical and biomedical analysis》1990,8(8-12):667-670
A flow injection-fluorimetric determination of thiamine is reported. The procedure is based on the oxidation of the analyte with potassium hexacyanoferrate(III) immobilized on an anionic exchange resin; the fluorescence is monitored in aqueous basic solution. Concentrations of the vitamin of 0.1–4 ppm have been determined; the relative standard deviation was 1.8%. The injection rate was 28 samples/h. The influence of other substances and the determination of the drug in a pharmaceutical formulation are also reported. 相似文献