全文获取类型
收费全文 | 176907篇 |
免费 | 6682篇 |
国内免费 | 328篇 |
专业分类
耳鼻咽喉 | 3152篇 |
儿科学 | 6523篇 |
妇产科学 | 4511篇 |
基础医学 | 24943篇 |
口腔科学 | 5003篇 |
临床医学 | 13230篇 |
内科学 | 32067篇 |
皮肤病学 | 4763篇 |
神经病学 | 16175篇 |
特种医学 | 9187篇 |
外国民族医学 | 25篇 |
外科学 | 29167篇 |
综合类 | 1112篇 |
一般理论 | 41篇 |
预防医学 | 8341篇 |
眼科学 | 4772篇 |
药学 | 12268篇 |
中国医学 | 357篇 |
肿瘤学 | 8280篇 |
出版年
2023年 | 781篇 |
2021年 | 1280篇 |
2020年 | 1156篇 |
2019年 | 1360篇 |
2018年 | 3013篇 |
2017年 | 2469篇 |
2016年 | 3427篇 |
2015年 | 3770篇 |
2014年 | 3986篇 |
2013年 | 5596篇 |
2012年 | 8702篇 |
2011年 | 8081篇 |
2010年 | 4756篇 |
2009年 | 3818篇 |
2008年 | 8006篇 |
2007年 | 8834篇 |
2006年 | 8867篇 |
2005年 | 9241篇 |
2004年 | 8806篇 |
2003年 | 8663篇 |
2002年 | 8595篇 |
2001年 | 6386篇 |
2000年 | 6485篇 |
1999年 | 5604篇 |
1998年 | 1622篇 |
1997年 | 1346篇 |
1996年 | 1022篇 |
1995年 | 832篇 |
1994年 | 786篇 |
1992年 | 2479篇 |
1991年 | 2398篇 |
1990年 | 2380篇 |
1989年 | 2205篇 |
1988年 | 1949篇 |
1987年 | 1940篇 |
1986年 | 1790篇 |
1985年 | 1737篇 |
1984年 | 1340篇 |
1983年 | 1093篇 |
1979年 | 1455篇 |
1978年 | 1047篇 |
1977年 | 888篇 |
1975年 | 1107篇 |
1974年 | 1140篇 |
1973年 | 1042篇 |
1972年 | 1051篇 |
1971年 | 1020篇 |
1970年 | 914篇 |
1969年 | 858篇 |
1968年 | 826篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
81.
K. Bühler T. Schumacher K. Küper T. Fassbinder J. Griebel 《Archives of gynecology and obstetrics》1987,242(1-4):858-859
Ohne Zusammenfassung 相似文献
82.
Cerebral infarction is rare in premature newborns and is most commonly the result of arterial embolization from the placenta. A focal echodense area was identified on prenatal cranial ultrasonography (US) in a premature infant (34 weeks of gestation). After birth, cerebral infarction was confirmed by magnetic resonance imaging (MRI). The clinical findings, imaging findings and pathogenesis are discussed. New diagnostic methods such as MRI show to be a useful approach in the neonatal period facilitating recognition of cerebrovascular accidents also in low-birth-weight infants. 相似文献
83.
The authors' 5-year experience in the management and care of prostatic carcinoma are summarized. Their method differs essentially from earlier practice. They have found a new diagnostic and therapeutic method by introducing the TECO irradiation therapy, extensively using bone scintigraphy, by introducing cytostatics, extensively applying the prostate-specific acid phosphatase and by performing rectal biopsy of the prostate. They describe their own observations on the diagnostics and therapy of prostatic carcinoma. They stress that none of the therapies is the method of choice, the use of the various kinds of treatment are defined by strict indications. They state that care of prostatic cancer patients is highly important because only observation of the course of the disease may ensure the evaluation of treatment results and the indication of the adequate therapeutic method. 相似文献
84.
85.
K. E. Schneweis M. Brado B. Ebers A. Friedrich M. Olbrich W. Schüler 《Medical microbiology and immunology》1987,177(1):1-8
In the model of genital herpes simplex virus (HSV)-infection of mice, early latency could be induced by passive immunization with HSV-specific antibodies and, to a lesser degree, by adoptive transfer of immune lymphocytes prepared from spleen and draining lymph nodes of genitally infected syngeneic mice. Conversely, spontaneously occurring latency was inhibited by treatment of the animals with cyclophosphamide (Cph) and, to a lesser degree, with cyclosporin A (CyA). Whereas the effect of CyA could be compensated by passively administered HSV-specific antibodies, that of Cph could not. Apparently specific antibodies cooperate with a non-specific proliferating cell type, probably macrophages and/or NK-cells, as could be demonstrated by significantly reduced antibody effect in silica-treated mice. Moreover, F(ab)2 fragments, in contrast to complete antibody molecules, were inactive. HSV-specific antibodies and also immune lymphocytes had little effect on virus production in the mucous membranes, immune lymphocytes being at least as active as antibodies. It is therefore not probable that latency is induced by attenuation of the peripheral disease. It can rather be concluded that the neuron itself is the target for the action of specific antibodies, cooperating in turn with macrophages and/or NK cells.With support of the Deutsche Forschungsgemeinschaft, Schn 174/6-3 相似文献
86.
Ernst R. Kuse Joerg Kotzerke Silke Müller Björn Nashan Rainer Lück Karsten Jaeger 《Transplant international》2002,15(6):272-277
It has been demonstrated that total parenteral nutrition (TPN) modulates the function of the hepatic reticuloendothelial system (RES). The objective of this study was to evaluate the impact of two different TPN lipid emulsions on the recovery of allograft RES function after orthotopic liver transplantation (OLTx). In a prospective, double-blind study, OLTx patients were randomly assigned to two treatment groups. Group I ( n=13) received a TPN regimen that included long-chain triglycerides (LCT). Group II ( n=9) received a TPN regimen that included a fat emulsion consisting of both medium-chain triglycerides (MCT) and LCT. At baseline, i.e., on days 2 or 3 after OLTx ( t1), before lipids for TPN were started, hepatic RES function was determined using the human serum albumin millimicrosphere technique (K-value, 1/min). A second measurement ( t2) was obtained after 7 days of TPN, including one of the study's two fat emulsions. The mean (+/- SD) K-value (1/min) was 0.48+/-0.16 in the LCT group and 0.55+/-0.28 in the MCT/LCT group at t1, and it improved to 0.62+/-0.21 in the LCT group and to 0.86+/-0.32 in the MCT/LCT group at t2. RES function recovery was significantly better in the MCT/LCT group ( P< or = 0.05). MCT/LCT emulsion appears to be the TPN fat emulsion of choice after OLTx as it seems to have less impact on hepatic RES recovery. 相似文献
87.
The atomic rearrangement cascade that follows the electron-capture decay process in low-Z radionuclides involves X-rays which have high photoelectric interaction probabilities. When the K-shell binding energy of the ionized atom (e.g., hydrogen) is significantly lower than the energy of the X-ray photon, the detector response to a photon-equivalent energy electron and the whole photoionization process are very similar. This is not the case when the scintillator cocktail contains larger atoms (e.g., oxygen and phosphorus in Ultima Gold). For larger Z atoms, the reduced energy of the whole photoionization process is less than the reduced energy of the interacting photon due to the nonlinear effects of ionization quenching. This paper shows the convenience of including a more detailed simulation of the photoionization process in the atomic rearrangement detection model for electron-capture nuclides such as (55)Fe, (51)Cr and (54)Mn. The need for more elaborate atomic rearrangement models is a consequence of the analysis of (125)I data. 相似文献
88.
89.
U. Bolm-Audorff S. Brandenburg T. Brüning H. Dupuis R. Ellegast G. Elsner K. Franz H. Grasshoff V. Grosser L. Hanisch B. Hartmann E. Hartung K. G. Hering G. Heuchert M. Jäger J. Krämer Dr. A. Kranig E. Ludolph A. Luttmann A. Nienhaus W. Pieper K.-D. Pöhl T. Remé D. Riede G. Rompe K. Schäfer S. Schilling E. Schmitt F. Schröter A. Seidler M. Spallek M. Weber 《Trauma und Berufskrankheit》2005,7(3):211-252
Occupational diseases Nos. 2108 and 2110 correspond to intervertebral disc-related diseases of the lumbar spine from many years of carrying or lifting heavy loads, occupations in extreme postures of full flexion or oscillation of the whole body when seated, and which compel the cessation of all activities which are or could be the cause for the origin, exacerbation or recurrence of the disease. These occupational diseases came into force at the start of 1993, but there have been considerable problems in their implementation. The present Part I of the contribution is the result of the work of an interdisciplinary study group and contains medical criteria for the assessment of possibly strain-related clinical characteristics and the evaluation of other possible causes. Part II is to be published in Volume 4/2005 and will deal with questions related to forced cessation and to the assessment of the loss of earning ability. Agreement was reached in many areas related to the assessment of occupational claims. This should allow for evidence-based decision making in the future for the occupational diseases Nos. 2108 and 2110. 相似文献
90.