全文获取类型
收费全文 | 166878篇 |
免费 | 6424篇 |
国内免费 | 418篇 |
专业分类
耳鼻咽喉 | 2211篇 |
儿科学 | 4856篇 |
妇产科学 | 4004篇 |
基础医学 | 23889篇 |
口腔科学 | 5474篇 |
临床医学 | 9592篇 |
内科学 | 36882篇 |
皮肤病学 | 4656篇 |
神经病学 | 13370篇 |
特种医学 | 4182篇 |
外国民族医学 | 1篇 |
外科学 | 19158篇 |
综合类 | 806篇 |
一般理论 | 24篇 |
预防医学 | 19919篇 |
眼科学 | 4360篇 |
药学 | 12968篇 |
1篇 | |
中国医学 | 687篇 |
肿瘤学 | 6680篇 |
出版年
2023年 | 834篇 |
2022年 | 683篇 |
2021年 | 2685篇 |
2020年 | 1504篇 |
2019年 | 3018篇 |
2018年 | 4988篇 |
2017年 | 3116篇 |
2016年 | 3110篇 |
2015年 | 3456篇 |
2014年 | 3929篇 |
2013年 | 5939篇 |
2012年 | 10147篇 |
2011年 | 10722篇 |
2010年 | 5360篇 |
2009年 | 4043篇 |
2008年 | 8762篇 |
2007年 | 9419篇 |
2006年 | 9009篇 |
2005年 | 8617篇 |
2004年 | 7990篇 |
2003年 | 7501篇 |
2002年 | 7121篇 |
2001年 | 4942篇 |
2000年 | 5503篇 |
1999年 | 4221篇 |
1998年 | 815篇 |
1992年 | 2252篇 |
1991年 | 2004篇 |
1990年 | 1998篇 |
1989年 | 1713篇 |
1988年 | 1640篇 |
1987年 | 1539篇 |
1986年 | 1562篇 |
1985年 | 1471篇 |
1984年 | 1050篇 |
1983年 | 908篇 |
1979年 | 1208篇 |
1978年 | 814篇 |
1977年 | 791篇 |
1976年 | 746篇 |
1975年 | 877篇 |
1974年 | 1121篇 |
1973年 | 1166篇 |
1972年 | 1112篇 |
1971年 | 1077篇 |
1970年 | 1011篇 |
1969年 | 1085篇 |
1968年 | 1107篇 |
1967年 | 978篇 |
1966年 | 878篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
151.
M D Luque de Castro M Valcárcel 《Journal of pharmaceutical and biomedical analysis》1990,8(4):329-336
The different types of instruments used for monitoring pharmaceutical dissolution testing are presented. Their features and the need for automation are critically discussed. The advantages of flow injection analysis in this respect are illustrated by a variety of examples clearly showing its adaptability to the different problems posed by other automatic and non-automatic alternatives. 相似文献
152.
To evaluate the effects of irradiation on heterotopically placed vascularized knee isografts, a single dose of 10 Gy of total-body irradiation was given to Lewis donor rats. Irradiation was delivered either 2 or 6 days prior to harvesting or subsequent transplantation, and evaluated at 1, 2, and 4 weeks after grafting. Irradiation caused endothelial depopulation of the graft artery, although vascular pedicle patency was maintained throughout the study. Bone graft viability and mineralization were normal. Dramatic changes in the bone marrow were seen that included an increase of its fat content (P less than 0.001), and a concomitant decrease in bone marrow-derived immunocompetent cells. These changes were more prominent in recipients of grafts from day -6 irradiated donor rats. Total-body irradiation did not prejudice the use of vascularized bone grafts, and exhibited an associated immunosuppresant effect over the vascular endothelium and bone marrow. This may be a further rational conditioning procedure to avoid recipient manipulation in vascularized bone allotransplantation. 相似文献
153.
154.
155.
Prospective study of antigenemia,plasma viremia and lymphocytic viremia in HIV-infected hemophiliacs
S. Melón Garcia M. de Oña Navarro C. Rodriguez Pinto M. Fernández Urgellés A. Martinez Gutierrez P. de la Iglesia F. J. Mendez García 《European journal of clinical microbiology & infectious diseases》1995,14(5):400-405
A total of 186 blood samples from 24 HIV-1 seropositive hemophiliac patients, monitored every four months for 29 months, were investigated for the presence of viral antigen in plasma. In addition, peripheral blood mononuclear cells (PBMC) were cultured for HIV-1, using normal PBMC as a target for replication. Antigenemia was detected in 51 % of the patients and from PBMC in 87.5 % of the patients. The incidence of HIV isolation in asymptomatic patients (42.8 %) was similar to that found in symptomatic patients (51.4 %). Patients with opportunistic infections had a higher incidence of lymphocytic viremia (p<0.05). Plasma viremia was closely associated (p<0.05) with low CD4+ counts and infection progression. The persistence of antigenemia was also a marker of a poor clinical course. In treated patients, plasma viremia was the marker that better correlated with the clinical course, and it did not appear during the first nine months of therapy. Zidovudine doses of >500 mg/day significantly lowered the appearance of antigenemia and lymphocytic viremia (p<0.05). 相似文献
156.
P Bálványossy 《Der Unfallchirurg》1990,93(1):27-31
Anatomic dissection of 220 cadaver shoulders was performed to find out more about the static stabilizers of the shoulder joint. The static stabilizers, i.e. the glenohumeral ligaments, were always found to be present and strong in healthy shoulders. It was revealed that in anatomic preparations with all the organs removal except the synovial capsule, the capsule ligaments completely stabilized the joint. Anterior dislocation at 45 degrees of abduction was prevented by the superior and medial glenohumeral ligaments, while at 90 degrees of abduction the inferior glenohumeral ligament prevented dislocation. When anterior dislocation has occurred even the coracohumeral ligament must be ruptured. A new finding recorded is that the glenoid labrum is the origin of the inferior glenohumeral ligament and not a triangular static organ enlarging the socket and having a similar function to the menisci in the knee. This ligament is the most important ventral stabilizer of the humeral joint. With the conventional arthrotomy technique the medial and inferior ligaments are immediately cut through and therefore cannot be seen. The inferior glenohumeral ligament must be reconstructed in cases of anterior recurrent dislocation. 相似文献
157.
A series of N-(phosphonoacetyl)-dipeptide derivatives was synthesized for pharmacological testing as antihypertensive compounds. Several of these compounds demonstrated a moderate antihypertensive effect in Wistar spontaneous hypertensive rats (SHR) with p.o. dosing. ACE inhibition by the compounds was studied using ACE from rat plasma and lung. Inhibitors containing esterified C-termini are pro-drugs and showed activity only for plasma ACE. 相似文献
158.
P Bálványossy K Dévay L Alf?ldi 《Magyar traumatológia, orthopaedia és helyreállító sebészet》1990,33(2):140-141
Authors describe a case of isolated posttraumatic neuropraxy of the musculocutaneous nerve. With the presentation of this very rare case attention is called, based on literary date, to the fact that the above injury can be mixed with the distal tendon rupture of the biceps. 相似文献
159.
160.