全文获取类型
收费全文 | 1516060篇 |
免费 | 115503篇 |
国内免费 | 6785篇 |
专业分类
耳鼻咽喉 | 19188篇 |
儿科学 | 49782篇 |
妇产科学 | 41962篇 |
基础医学 | 207186篇 |
口腔科学 | 41515篇 |
临床医学 | 134485篇 |
内科学 | 309754篇 |
皮肤病学 | 35981篇 |
神经病学 | 121009篇 |
特种医学 | 65217篇 |
外国民族医学 | 370篇 |
外科学 | 237500篇 |
综合类 | 32598篇 |
现状与发展 | 2篇 |
一般理论 | 415篇 |
预防医学 | 121296篇 |
眼科学 | 32114篇 |
药学 | 105753篇 |
7篇 | |
中国医学 | 2344篇 |
肿瘤学 | 79870篇 |
出版年
2018年 | 16796篇 |
2017年 | 14518篇 |
2016年 | 15841篇 |
2015年 | 18840篇 |
2014年 | 23836篇 |
2013年 | 32755篇 |
2012年 | 45394篇 |
2011年 | 43087篇 |
2010年 | 26263篇 |
2009年 | 27312篇 |
2008年 | 38127篇 |
2007年 | 41189篇 |
2006年 | 42601篇 |
2005年 | 49622篇 |
2004年 | 50667篇 |
2003年 | 44924篇 |
2002年 | 36918篇 |
2001年 | 69614篇 |
2000年 | 69293篇 |
1999年 | 61327篇 |
1998年 | 17157篇 |
1997年 | 15232篇 |
1996年 | 16305篇 |
1995年 | 16536篇 |
1994年 | 15379篇 |
1993年 | 14370篇 |
1992年 | 52943篇 |
1991年 | 51815篇 |
1990年 | 50231篇 |
1989年 | 47765篇 |
1988年 | 44310篇 |
1987年 | 43517篇 |
1986年 | 41006篇 |
1985年 | 39196篇 |
1984年 | 29463篇 |
1983年 | 24634篇 |
1982年 | 14724篇 |
1981年 | 13115篇 |
1980年 | 12453篇 |
1979年 | 26919篇 |
1978年 | 19111篇 |
1977年 | 15953篇 |
1976年 | 14524篇 |
1975年 | 15858篇 |
1974年 | 18810篇 |
1973年 | 17789篇 |
1972年 | 16576篇 |
1971年 | 15425篇 |
1970年 | 14179篇 |
1969年 | 13254篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
Using Syva EMIT reagents and a Cobas Bio centrifugal analyser we have developed a cost-effective assay for the detection of cannabinoids in urine. With this method, up to 1500 samples can be assayed with a single 100 test kit while maintaining acceptable precision. A mean CV of 6.1% was obtained for the concentration range 80-130 micrograms/l. The method is suitable for high-risk urines since heart treatment may be performed prior to analysis. There was no significant change in the measured concentration of cannabinoids in urine samples on storage in plastic containers, refrigerated or frozen, for up to seven weeks. 相似文献
992.
We conducted a double blind controlled trial in 28 Duchenne muscular dystrophy (DMD) patients with Deflazacort (DF), an oxazoline derivative of prednisolone which reduces its side-effects. Myometric muscle strength measurements, Scott Score and timed tests showed statistically significant improvement for the treated group (P less than 0.05). Side-effects after 9 months of treatment included mild cushingoid appearance in four patients (28%) and moderate in only one (7%), increased appetite in seven (50%), increased body hair in four (28%), irritability and hyperactivity in three (21%). Increased body weight was not prominent and was controlled with dietary measures. No patient had to be withdrawn from medication. More research and long-term follow-up are needed in order to establish the mechanism of improvement and the consequences of long-term steroid administration in DMD. In this regard DF appears as an alternative to prednisone preserving its benefits but with fewer side-effects. 相似文献
993.
J D Pfeifer 《Clinical neuropathology》1991,10(5):232-236
Diastematomyelia is a congenital dysraphism of the spinal cord in which the affected segment is longitudinally divided by a band of fibrous tissue, cartilage, or bone. Diastematomyelia has been well described in the cervical, thoracic, lumbar, and sacral spinal cord; this paper presents a case involving the basicranium. Based on the early embryologic development of the basicranium and brain, this case demonstrates that the same mechanisms proposed as the origin of spinal diastematomyelia may also operate at a more cephalad level. 相似文献
994.
A young patient had an auriculo-ventricular block and a distal myopathy with muscle biopsy findings suggestive of inclusion body myositis. What was most unusual was the presence of numerous sarcoplasmic bodies identified as desmin by electron microscopy and immunocytochemistry. The nosological situation of this condition is discussed. 相似文献
995.
Artificial dopamine agonists are widely employed for the treatment of idiopathic parkinsonism. Pleuropulmonary disease has previously been reported to occur with the use of bromocriptine and mesulergine. We report similar adverse effects induced by the newer agonists lisuride and cabergoline. All these agents are tetracyclic ergot derivatives. This suggests a causal link between ergot-derived dopamine agonists and pleuropulmonary disease. 相似文献
996.
997.
Forty-two therapists conducting individual psychotherapy with schizophrenic outpatients in a public mental health system responded to a questionnaire that focused on the types of interventions used and the issues and problems encountered in therapy. The therapists spent 59 percent of their time in supportive, problem-solving work and only 32 percent in traditional psychotherapeutic interventions, such as providing insight. The most common issues in therapy were relationship problems, family concerns, depression, losses, and the role of medications in the client's life. The most significant impediments to therapeutic work were the lack of community resources, the client's noncompliance with medications and lack of motivation, and dual diagnoses. Suggestions are offered for improving psychotherapy with schizophrenic outpatients in the public mental health system. 相似文献
998.
Bipolar disorder is a serious mental illness affecting a large number of Americans. While lithium, the treatment of choice for this disorder, is usually effective, a substantial number of individuals with bipolar disorder are not helped by lithium or are intolerant to its side effects. Consequently, investigators are searching for alternative drugs in order to treat lithium-resistant patients. Although a number of alternative drug treatments have been discussed in the literature, only the anticonvulsants carbamazepine and valproate appear to warrant serious consideration at this time. Future research will further define their roles as antimanic agents. 相似文献
999.
1000.
NTS fallout-induced multiple myeloma in Utah. 总被引:1,自引:0,他引:1