全文获取类型
收费全文 | 33378篇 |
免费 | 2118篇 |
国内免费 | 812篇 |
专业分类
耳鼻咽喉 | 164篇 |
儿科学 | 511篇 |
妇产科学 | 357篇 |
基础医学 | 5039篇 |
口腔科学 | 572篇 |
临床医学 | 6069篇 |
内科学 | 5685篇 |
皮肤病学 | 265篇 |
神经病学 | 2252篇 |
特种医学 | 2552篇 |
外科学 | 3144篇 |
综合类 | 3404篇 |
现状与发展 | 2篇 |
预防医学 | 2569篇 |
眼科学 | 243篇 |
药学 | 1967篇 |
58篇 | |
中国医学 | 860篇 |
肿瘤学 | 595篇 |
出版年
2024年 | 576篇 |
2023年 | 723篇 |
2022年 | 1250篇 |
2021年 | 1663篇 |
2020年 | 1621篇 |
2019年 | 1437篇 |
2018年 | 1280篇 |
2017年 | 1162篇 |
2016年 | 1000篇 |
2015年 | 1062篇 |
2014年 | 1866篇 |
2013年 | 2134篇 |
2012年 | 1556篇 |
2011年 | 1627篇 |
2010年 | 1388篇 |
2009年 | 1332篇 |
2008年 | 1365篇 |
2007年 | 1239篇 |
2006年 | 1197篇 |
2005年 | 911篇 |
2004年 | 807篇 |
2003年 | 825篇 |
2002年 | 689篇 |
2001年 | 668篇 |
2000年 | 563篇 |
1999年 | 482篇 |
1998年 | 419篇 |
1997年 | 389篇 |
1996年 | 424篇 |
1995年 | 398篇 |
1994年 | 338篇 |
1993年 | 344篇 |
1992年 | 355篇 |
1991年 | 271篇 |
1990年 | 255篇 |
1989年 | 222篇 |
1988年 | 263篇 |
1987年 | 245篇 |
1986年 | 194篇 |
1985年 | 219篇 |
1984年 | 212篇 |
1983年 | 116篇 |
1982年 | 177篇 |
1981年 | 130篇 |
1980年 | 143篇 |
1979年 | 114篇 |
1978年 | 96篇 |
1977年 | 87篇 |
1976年 | 82篇 |
1973年 | 71篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
12.
The determination of the UK Government to modernise medical careers, the shortage of training jobs for local medical graduates, the establishment of the Postgraduate Medical Training and Education Board (PMETB) and European Union rules have combined to change the scheme of surgical training in the United Kingdom. In the opinion of the author, the Indian Otorhinolaryngological (ORL) trainee can no longer aspire to reasonable higher training in the UK. 相似文献
13.
Jeremy L Emken Elspeth M Mcdougall Ralph V Clayman 《JSLS, Journal of the Society of Laparoendoscopic Surgeons》2004,8(2):195-199
Laparoscopic surgery is gaining popularity among the surgical community. While its prevalence expands, the need for reliable training and assessment tools is becoming increasingly important. Laparoscopic skills are not an innate behavior, nor can they be easily mimicked, and can only be acquired through hands-on training. A consensus exists among physicians that establishment and evaluation of technical skill in surgical training programs are inadequate and in need of improvement. A validated, reliable bench model that could train and assess could be standardized and provide numerous benefits including determination of which medical students should consider a career in surgery, valuable feedback to residents, a tracking mechanism of resident performance, a possible certification and recertification tool, and to allow for interinstitutional comparison. To this end, several potentially successful bench models testing dexterity, hand-eye coordination, and depth perception have been developed. A few models have been proven to be both valid and reliable indicators of technical skill. Although the future remains uncertain, enough groundwork has been laid to begin incorporating technical skill training and assessment into surgical training programs. 相似文献
14.
Nicholas Stephens Eric Marques Christopher Livingston 《CANADIAN JOURNAL OF PLASTIC SURGERY》2007,15(1):44-46
Anomalies of the flexor digitorum superficialis muscle are extremely uncommon and usually present as a painful mass or pseudotumour within the palm. Diagnosis may be difficult because many other soft tissue tumours (lipomas, ganglions, giant cell tumours and hamartomas) may present similarly. Magnetic resonance imaging helps to define the extent and characteristics of this anomalous muscle belly and to distinguish it from a soft tissue sarcoma, whereas plain radiographs are of little value. Three types of flexor digitorum superficialis muscle anomalies have been described, and treatment consists of subtotal or total surgical debulking of the mass if symptoms persist or if the diagnosis is in question. Most patients have complete resolution and full recovery. To date, 20 cases have been reported in the literature, usually involving the right small finger. In the present paper, the case of an anomalous flexor digitorum superficialis muscle in a 17-year-old male patient’s left index finger is reported. Symptoms were relieved following surgical debulking and hand-based occupational therapy. 相似文献
15.
J. F. STOVER U. E. PLEINES M. C. MORGANTI-KOSSMANN T. KOSSMANN K. LOWITZSCH & O. S. KEMPSKI 《European journal of clinical investigation》1997,27(12):1038-1043
The excitatory transmitters glutamate and aspartate become toxic whenever their extracellular levels are increased because of neuronal, glial and endothelial impairment. Taurine, a volume-regulating amino acid, is released upon excitotoxin-induced cell swelling. Our aim was to investigate if glutamate and aspartate in cerebrospinal fluid (CSF) reveal neuropathology in neurological patients, and if taurine unmasks glutamate-mediated toxicity. Glutamate and aspartate are doubled in viral meningitis, acute multiple sclerosis (MS) and myelopathy compared with control subjects and patients with peripheral facial nerve palsy. These levels do not coincide with a disturbed blood–brain barrier, as estimated by the albumin ratio, are independent of their precursors (glutamine, asparagine) and are not associated with cell lysis. Taurine is significantly increased in meninigitis, acute MS, and myelopathy, suggesting glutamate-mediated toxicity. Analysis of transmitters in lumbar CSF can be used to identify patients with cerebral and spinal pathology who might benefit from specific receptor-modulating agents. 相似文献
16.
M. KROTKIEWSKI L. SJ
STR
M L. SULLIVAN P.-A. LUNDBERG G. LINDSTEDT H. WETTERQVIST P. BJ
RNTORP 《Journal of internal medicine》1984,216(3):269-275
Abstract Thyroid hormones were measured before, during and after acute exercise (60 min) or physical training (3 months) in obese women. Thyroid stimulating hormone concentration increased during acute work and decreased immediately after. No changes were seen during the two following days. An increase was seen after ten days as well as after three months of physical training. Thyroxine concentrations showed no changes. 3,5,3′-Triiodothyronine decreased slightly immediately after acute exercise, and after three months of physical training, 3,3′,5′-triiodothyronine (reverse triiodothyronine) increased slowly during and after acute exercise. A negative correlation was found between changes in fasting insulin and thyroxine and a positive correlation between changes in blood pressure and triiodothyronine after training. Lack of agreement in previous reports is probably due to methodological differences such as methods more or less susceptible to fatty acid interference, and thyroid hormones changing differently during acute work and before and after physical training. The duration of the study may also be of importance, even 3 months possibly being too short for attaining equilibrium in thyroid homeostasis. 相似文献
17.
We hypothesized that sensory input from the moving leg induces presynaptic inhibition of the soleus H reflex pathway in the contralateral stationary leg. The results showed a crossed inhibition during passive pedalling movement of the leg, which was not removed by low levels of tonic contraction of soleus in the stationary leg. The inhibition was correlated exponentially to the rate of the movement (R2=0.934, P<0.05) and was not dependent on the quadrants through which the moving leg was passing. Static flexion of the stationary leg caused ipsilateral inhibition of the reflexes (t=5.590, P<0.05), independent of the orientations of the other leg. We concluded that sensory inflow from the moving leg induces presynaptic inhibition in the stationary leg, that a complex transformation of the sensory input in the spinal cord or brain underlies the tonic crossed inhibition and phasic ipsilateral inhibition, and that descending motor commands exert a powerful control over these sensorimotor modulatory mechanisms. 相似文献
18.
The purpose of this study was to assess, in subjects with low back pain, the changes and their permanence in muscular performance after a 3 month progressive physical exercise program. Ninety subjects with chronic low back pain participated in the study. The study design was controlled and it was carried out in three groups: intensive training, home exercise, and control group. Isometric and dynamic muscle strength of the trunk and lower limb were measured, at the beginning of the study and after the 3 months exercise program, and then during each of the follow-up sessions. The Oswestry Index and back pain intensity were also determined. Both exercise groups received benefit from the progressive exercise program. Their muscular performance improved and their back pain intensity decreased significantly. Among the home exercise group, the Oswestry Index also changed positively. The results demonstrate that the home exercise program could be as effective as the intensive training program in increasing muscle strength, as well as decreasing back pain and functional disability among low back pain patients with mild functional limitations. 相似文献
19.
H. Roos L. Dahlberg L. S. Lohmander 《Scandinavian journal of medicine & science in sports》1993,3(2):127-130
The concentration of cartilage proteoglycan fragments in knee joint fluid was measured before and after one event of physical exercise in 33 healthy athletes. Nine athletes ran on a treadmill for 60 min, 16 ran on road for 80 min and 8 played one soccer game (90 min). Before exercise, the levels of proteoglycan fragments in the athlete joint fluid were lower than in a previously analyzed reference group. After exercise, the concentration of proteoglycan fragments increased in all of the 7 athletes that could be directly compared before and after exercise. This increased concentration of proteoglycan fragments in the joint fluid could be an effect of mechanical loading of the cartilage in combination with a possible high turn-over rate of the cartilage matrix in the athletes. 相似文献
20.
Summary Unusual inclusions with some of the features of reducing bodies were encountered in the skeletal muscle biopsy of a 2.5-year-old boy with childhoodonset acid maltase deficiency. The biopsy revealed a vacuolar myopathy with lysosomal storage of glycogen and eosinophilic refractile inclusions in myofibers, which appeared dark blue with the menadione-nitroblue tetrazolium reaction. The significance of the association of inclusions with reducing properties in the setting of acid maltase deficiency is discussed. 相似文献