首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   3615篇
  免费   192篇
  国内免费   17篇
耳鼻咽喉   10篇
儿科学   145篇
妇产科学   53篇
基础医学   250篇
口腔科学   62篇
临床医学   385篇
内科学   567篇
皮肤病学   53篇
神经病学   267篇
特种医学   700篇
外科学   620篇
综合类   170篇
一般理论   2篇
预防医学   258篇
眼科学   15篇
药学   92篇
中国医学   39篇
肿瘤学   136篇
  2022年   22篇
  2021年   39篇
  2020年   23篇
  2019年   48篇
  2018年   64篇
  2017年   27篇
  2016年   40篇
  2015年   49篇
  2014年   92篇
  2013年   105篇
  2012年   138篇
  2011年   148篇
  2010年   140篇
  2009年   125篇
  2008年   126篇
  2007年   145篇
  2006年   152篇
  2005年   150篇
  2004年   118篇
  2003年   122篇
  2002年   98篇
  2001年   104篇
  2000年   93篇
  1999年   99篇
  1998年   75篇
  1997年   85篇
  1996年   86篇
  1995年   63篇
  1994年   55篇
  1993年   56篇
  1992年   94篇
  1991年   72篇
  1990年   84篇
  1989年   98篇
  1988年   93篇
  1987年   93篇
  1986年   91篇
  1985年   72篇
  1984年   57篇
  1983年   34篇
  1982年   26篇
  1981年   24篇
  1980年   28篇
  1979年   29篇
  1978年   41篇
  1977年   33篇
  1976年   28篇
  1975年   27篇
  1974年   22篇
  1970年   12篇
排序方式: 共有3824条查询结果,搜索用时 31 毫秒
1.
1. A 26-32 month follow-up of 16 heroin-dependent subjects who entered a pilot trial of treatment with buprenorphine (a mixed agonist/antagonist) suggests that positive response to treatment may identify a subgroup of untreated addicts whose levels of psychosocial functioning are intermediate between those for whom methadone (a pure agonist) or naltrexone (a pure antagonist) would be indicated. 2. Buprenorphine's pharmacologic profile provides a missing link in available modalities for opiate dependence treatment, making it acceptable for many addicts who will not accept methadone maintenance treatment, join a residential therapeutic community, or be successful on naltrexone treatment. 3. Eight of the 16 ss were abstinent from heroin while receiving 0.6-3.9 mg/day buprenorphine and counseling. Responders (mean age 34 yrs) had been heroin dependent for a mean of 9.5 years (range 6-17 yrs), all were self-supporting, 4 lived with a non-addicted spouse, 5 had no prior treatment for addiction and 3 had prior naltrexone treatment, but had discontinued it and relapsed. Non-responders (mean age 30 yrs) had been heroin dependent for a mean of 7.4 yrs (range 2-19 yrs), 7 had no regular employment, all were single and 7 had no prior treatment for addiction. 4. Levels of psychosocial functioning (work, home, leisure) and global assessments of functioning were significantly higher for buprenorphine responders than non-responders (p less than .001 and p less than .01 respectively). 5. A new formulation of buprenorphine needs to be developed for addiction treatment, ideally consisting of 0.5 mg and 2.0 mg sublingual tablets.  相似文献   
2.
Ten temporomandibular joints, obtained from three asymptomatic patients and two cadavers, were examined by three-dimensional computed tomography. The osseous components of the condylar process of the mandible and the glenoid fossa of the temporal bone were well visualized. The meniscus was visualized in both the closed- and the open-mouthed positions. Advantages and disadvantages of the technique are discussed.  相似文献   
3.
Relatives of 22 schizotypal probands were evaluated for lifetime psychiatric diagnoses. Forty-four (N = 44) of the 97 available relatives were interviewed directly using the Diagnostic Interview Schedule. The rates of psychiatric diagnoses were compared with those of sixty-six (N = 66) of 140 relatives of 30 depressed patients. Family history of mental illness was ascertained by the informant method on the remainder of relatives of both proband groups. The rate of depression found in the relatives of schizotypal patients was 52% in those directly interviewed and 25.7% when informants' reports on unavailable relatives are pooled with direct interview data. These rates were not significantly higher than those found for the relatives of depressed probands (34.8% by direct interview and 21% including reports from informants). The high rates of depression in the relatives of schizotypal probands may indicate that schizotypal personality is associated with affective disorder and not only with schizophrenia. However, the high rates may be due to the presence of depressive character traits in relatives, which inflate the rates of dysthymic disorder and other chronic depressive disorders in the relatives of borderline patients.  相似文献   
4.
5.
We describe a 34-year-old man from southern Florida with a history of intravenous drug use, dually infected with human immunodeficiency virus type 1 (HIV-1) and human T-lymphotropic virus type II (HTLV-II), who developed a myelopathy clinically indistinguishable from HTLV-I-associated myelopathy/tropical spastic paraparesis (HAM/TSP). This myelopathy was characterized by spastic lower extremity weakness, distal paresthesias, sensory loss with a discrete thoracic level to pinprick, back pain, impotence, and sphincter disturbances. Nerve conduction studies revealed an associated mixed axonal and demyelinative neuropathy. Despite a lack of response to 10 months of zidovudine therapy, the myeloneuropathy improved dramatically 2 years after its onset in the absence of any therapeutic intervention.  相似文献   
6.
7.
BACKGROUND CONTEXT: Multiple lytic lesions of the spine usually represent metastatic or infectious disease processes. PURPOSE: To describe an extremely rare presentation of an uncommon disease process. STUDY DESIGN/SETTING: Case report/university hospital. METHODS: We describe the management of a patient who presented with a pathological fracture of C3 and multiple lytic lesions of the cervical spine. RESULTS: After reconstructive surgery, the final pathological diagnosis was fibrous dysplasia. CONCLUSION: Fibrous dysplasia is rarely seen in the cervical spine and may mimic other pathological processes. The surgical and medical management of spinal fibrous dysplasia is described.  相似文献   
8.
9.
We present a modified EEG montage that detects small interchannel time differences and assists in localizing the epileptogenic focus. Regions with apparently synchronous epileptic discharges are displayed simultaneously in referential and subtraction derivations. The subtraction derivation is a bipolar configuration of two regions of interest that are not necessarily adjacent. The referential derivation reveals the polarity, voltage, and morphology of the two discharges, and the subtraction derivation detects asynchrony; the combined reference-subtraction derivation thus indicates the region that is activated first.  相似文献   
10.
This study demonstrates by a virologic culture method that human immunodeficiency virus (HIV) resides in bone. After freezing, some initially positive specimens no longer yielded virus, but those that continued to yield virus were not further altered by subsequent washing, which removed essentially all marrow, or by freeze-drying. The safeguards against potential transmission of HIV by a bone allograft are principally the screening and testing methods previously described, although there may be a further reduction of the remote residual risk by the freezing step in the usual technical sequence for tissue banking by sterile techniques.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号