全文获取类型
收费全文 | 129765篇 |
免费 | 5881篇 |
国内免费 | 289篇 |
专业分类
耳鼻咽喉 | 2066篇 |
儿科学 | 4038篇 |
妇产科学 | 2754篇 |
基础医学 | 17552篇 |
口腔科学 | 4748篇 |
临床医学 | 7953篇 |
内科学 | 32050篇 |
皮肤病学 | 4084篇 |
神经病学 | 10144篇 |
特种医学 | 2923篇 |
外国民族医学 | 2篇 |
外科学 | 15970篇 |
综合类 | 681篇 |
一般理论 | 36篇 |
预防医学 | 12908篇 |
眼科学 | 2907篇 |
药学 | 8943篇 |
中国医学 | 664篇 |
肿瘤学 | 5512篇 |
出版年
2023年 | 809篇 |
2022年 | 592篇 |
2021年 | 2685篇 |
2020年 | 1382篇 |
2019年 | 3007篇 |
2018年 | 5075篇 |
2017年 | 2956篇 |
2016年 | 2754篇 |
2015年 | 3065篇 |
2014年 | 3524篇 |
2013年 | 5292篇 |
2012年 | 9353篇 |
2011年 | 9998篇 |
2010年 | 5008篇 |
2009年 | 3526篇 |
2008年 | 7976篇 |
2007年 | 8548篇 |
2006年 | 7914篇 |
2005年 | 7814篇 |
2004年 | 6928篇 |
2003年 | 6481篇 |
2002年 | 6114篇 |
2001年 | 3851篇 |
2000年 | 4479篇 |
1999年 | 3330篇 |
1998年 | 520篇 |
1997年 | 321篇 |
1996年 | 316篇 |
1995年 | 250篇 |
1992年 | 1275篇 |
1991年 | 1052篇 |
1990年 | 939篇 |
1989年 | 769篇 |
1988年 | 644篇 |
1987年 | 630篇 |
1986年 | 622篇 |
1985年 | 534篇 |
1984年 | 398篇 |
1983年 | 303篇 |
1979年 | 338篇 |
1978年 | 207篇 |
1975年 | 271篇 |
1974年 | 320篇 |
1973年 | 353篇 |
1972年 | 290篇 |
1971年 | 315篇 |
1970年 | 292篇 |
1969年 | 296篇 |
1968年 | 268篇 |
1967年 | 238篇 |
排序方式: 共有10000条查询结果,搜索用时 390 毫秒
161.
Carmem Lúcia Pessoa-Silva Sasi Dharan Stéphane Hugonnet Sylvie Touveneau Klara Posfay-Barbe Riccardo Pfister Didier Pittet 《Infection control and hospital epidemiology》2004,25(3):192-197
OBJECTIVE: To evaluate the dynamics of bacterial contamination of healthcare workers' (HCWs) hands during neonatal care. SETTING: The 20-bed neonatal unit of a large acute care teaching hospital in Geneva, Switzerland. METHODS: Structured observation sessions were conducted. A sequence of care began when the HCW performed hand hygiene and ended when the activity changed or hand hygiene was performed again. Alcohol-based handrub was the standard procedure for hand hygiene. An imprint of the five fingertips of the dominant hand was obtained before and after hand hygiene and at the end of a sequence of care. Regression methods were used to model the final bacterial count according to the type and duration of care and the use of gloves. RESULTS: One hundred forty-nine sequences of care were observed. Commensal skin flora comprised 72.4% of all culture-positive specimens (n = 360). Other microorganisms identified were Enterobacteriaceae (n = 55, 13.8%); Staphylococcus aureus (n = 10, 2.5%); and fungi (n = 7, 1.8%). Skin contact, respiratory care, and diaper change were independently associated with an increased bacterial count; the use of gloves did not fully protect HCWs' hands from bacterial contamination. CONCLUSIONS: These data confirm that hands become progressively contaminated with commensal flora and potential pathogens during neonatal care, and identify activities at higher risk for hand contamination. They also reinforce the need for hand hygiene after a sequence of care, before starting a different task, and after glove removal. 相似文献
162.
163.
164.
A Parra F Gabi?o A Ramírez H Valencia I Coria A Espinosa de los Monteros 《Contraception》1991,44(5):541-547
The study was undertaken to analyze the basal and metoclopramide-stimulated serum PRL levels in healthy parous women users (group 1, n = 12) and non-users (group 2, n = 12) of a TCu-380 IUD. All women had regular menses and were studied between days 18 to 22 of their cycle; none had lactated nor regularly ingested any type of medication during the last six months. After a 10-12 hour overnight fast, peripheral venous blood samples were obtained through an indwelling catheter at -30, -15 and 0 minutes and at 60, 90 and 120 minutes after oral metoclopramide (10 mg). There were no significant differences in serum PRL between both groups, in basal levels nor throughout the test, whether analyzing the mean values at each sampling time, the sum of PRL levels from 60-120 minutes, or the peak levels. No correlation was observed between PRL levels and any of the clinical or obstetric characteristics of the women in both groups. Serum progesterone was greater than or equal to 4.0 ng/ml in all women. Thus, the use of alpha TCu-380 IUD did not induce any significant changes in basal nor in stimulated serum PRL levels. 相似文献
165.
Jocivania O da Silva Renata S Fernandes Fábio K Ticli Clayton Z Oliveira Maurício V Mazzi Jo?o J Franco Silvana Giuliatti Paulo S Pereira Andreimar M Soares Suely V Sampaio 《Toxicon》2007,50(2):283-291
We report here the antiproteolytic and antihemorrhagic properties of triterpenoid saponin inhibitors, named macrolobin-A and B, from Pentaclethra macroloba, against Bothrops snake venoms. The inhibitors were able to neutralize the hemorrhagic, fibrin(ogen)olytic, and proteolytic activities of class P-I and P-III metalloproteases isolated from B. neuwiedi and B. jararacussu venoms. Clotting and fibrinogenolytic activities induced by snake venoms and isolated thrombin-like enzymes were partially inhibited. Furthermore, the potential use of these inhibitors to complement antivenom therapy as an alternative treatment and/or used as molecular models for development of new therapeutical agents in the treatment of snake bite envenomations needs to be evaluated in future studies. 相似文献
166.
J. M. Bellón N. García-Honduvilla N. Serrano M. Rodríguez G. Pascual J. Buján 《Hernia》2005,9(4):338-343
The component of a composite prosthesis, which makes contact with the visceral peritoneum, can be reabsorbable or non-reabsorbable,
and laminar or reticular. This study was designed to determine whether the composition of this second, barrier component could
improve its behavior at this interface. Abdominal wall defects in rabbits were repaired using a polypropylene prosthesis (PP),
or the composites Sepramesh (PP+h) or Vicryl (PP+v). Fourteen days after surgery, the implants were evaluated by light and
scanning electron microscopy, and immunohistochemistry. Prosthetic areas occupied by adhesions (PP: 71.08±5.09, PP+h: 18.55±4.96,
P+v: 69.69±16.81%), neoperitoneal thickness (PP: 256.17±21.68, PP+h: 83.11±19.63, PP+v:213.72±35.90 μm) and macrophage counts
(PP: 8.73±1.16, PP+h: 27.33±4.13, PP+v: 31.24±3.08%) showed significant differences (P<0.05). The tested biomaterials induced an optimal recipient tissue infiltration. Least adhesion formation was observed on
the PP+h implants. This suggests that the second component, although reabsorbable, should be smooth in structure. 相似文献
167.
168.
169.
170.