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   3616篇
  免费   197篇
  国内免费   12篇
耳鼻咽喉   69篇
儿科学   127篇
妇产科学   53篇
基础医学   544篇
口腔科学   91篇
临床医学   194篇
内科学   646篇
皮肤病学   63篇
神经病学   276篇
特种医学   230篇
外科学   428篇
综合类   58篇
预防医学   363篇
眼科学   85篇
药学   328篇
中国医学   8篇
肿瘤学   262篇
  2023年   22篇
  2022年   32篇
  2021年   72篇
  2020年   41篇
  2019年   77篇
  2018年   80篇
  2017年   80篇
  2016年   84篇
  2015年   83篇
  2014年   129篇
  2013年   144篇
  2012年   257篇
  2011年   238篇
  2010年   135篇
  2009年   113篇
  2008年   194篇
  2007年   188篇
  2006年   217篇
  2005年   201篇
  2004年   159篇
  2003年   153篇
  2002年   119篇
  2001年   67篇
  2000年   62篇
  1999年   61篇
  1998年   21篇
  1996年   17篇
  1994年   14篇
  1993年   16篇
  1992年   52篇
  1991年   43篇
  1990年   47篇
  1989年   48篇
  1988年   38篇
  1987年   35篇
  1986年   30篇
  1985年   21篇
  1984年   26篇
  1983年   20篇
  1979年   25篇
  1977年   18篇
  1975年   16篇
  1974年   18篇
  1973年   20篇
  1972年   18篇
  1971年   21篇
  1970年   21篇
  1968年   15篇
  1967年   20篇
  1966年   17篇
排序方式: 共有3825条查询结果,搜索用时 15 毫秒
1.
2.
M Balázs  G Vadász  I Koncz  E Simon 《Orvosi hetilap》1991,132(39):2143-2146
15 patients with congestive gastropathy were reported including clinical and pathological characteristics of the disease. Every patient had alcoholic liver cirrhosis and portal hypertension. 6 patient's stomach was resected while in 2 further cases the disease was found at autopsy. In additional 7 cases the characteristic microvascular changes were observed in endoscopic biopsy specimens from the gastric mucosa. The authors presume that this disease has an acute and a chronic stage. In the acute stage dilated capillaries are present under the surface, not related to the inflammation of gastric mucosa. This phenomenon was described in the literature. In the chronic stage there are dilated and tortuous vessels in the submucosal layer surrounded by collagenous connective tissue. The authors suppose that the thick and fibrotic submucosal layer causes microcirculatory disturbances in the gastric mucosa. The impaired microcirculation may cause extensive ulcers with profuse and sometimes lethal bleeding.  相似文献   
3.
4.
Case report on a child with acute lymphogenous leukemia. Although there was constant hematological remission she developed an isolated leukemic iritis and secondary glaucoma. The clinical picture showed a characteristic stratification of the hyphema. After the patient had remained seated for a prolonged period of time the leukemic cells settled above the erythrocytes, forming a so-called pseudohypopyon, which diagnostically important. Cytologic examination after anterior chamber paracentesis is indispensable in order to establish the etiology of the disease. Isolated leukemic iritis may be the first sign of a relapse and therefore indicate a need to reinstitute induction therapy.  相似文献   
5.
Circulating IgG, IgA, and IgM antibodies to human eye muscle cytosol antigens were studied in 60 patients with Graves' ophthalmopathy using the indirect ELISA method. There was a significant difference in the levels of both IgG and IgA antibodies between the patients with Graves' ophthalmopathy and a control group (p < 0.001). IgA antibodies to eye muscle cytosol antigens were raised in 20 out of 29 patients with proptosis (class 3 ophthalmopathy), in comparison with 31 patients out of the total group of 60 with Graves' ophthalmopathy (p < 0.02). Anti-TSH receptor antibodies (TRAK) were not present in over half of the 31 patients with raised IgA antibodies to eye muscle antigens. However, a significant difference was found between the levels of IgG and IgA antibodies in the TRAK-negative patients (p < 0.05). These findings suggests that both IgG and IgA antibodies to eye muscle antigens might be important in the development of ophthalmopathy.  相似文献   
6.
N1303K is one of the most frequent non-delta F508 mutations causing cystic fibrosis in Central Europe. Since no restriction site is altered by this mutation and no other frequent mutations are known so far in exon 21, the detection requires a separate and laborious test. A mismatched primer was used to create an artificial Hin dIII site in amplified wildtype DNA, which is destroyed by the mutation. This allows for rapid and convenient detection by restriction enzyme digestion.  相似文献   
7.
Summary The Gd-DTPA-enhanced magnetic resonance findings in two patients with herniated thoracic intervertebral discs are reported. The first patient was a 56-year-old woman with a small subligamentous T6-7 disc herniation, slightly lateralized to the right. The second patient was a 51-year-old man with a central and right posterolateral disc herniation, including a large calcified fragment, at the T8-9 level. The nonenhanced MR examination revealed the presence of an extradural mass lesion in both patients, impinging upon the dural sac and compressing and displacing the spinal cord posteriorly. The lesion was slightly hypointense on both T1- and T2-weighted spin echo sequences. Following intravenous injection of Gd-DTPA in a dosage of 0.1 mmol/kg body weight, enhancement of the posterior longitudinal ligament was noted and triangular areas of contrast uptake were seen to occur in the epidural space above and below the herniated disc. At surgery, they were found to correspond to dilated and congested epidural veins.  相似文献   
8.
Two ascorbatoplatinum complexes, cis-diammineascorbatoplatinum(II) (AMA) and cis-bis(ascorbato)-trans-diaminocyclohexaneplatinum(II) (CHA), were tested for antitumor activity in vivo on P388 leukemia and in vitro in suspension culture and soft agar assay. Sensitive line of L1210 and sublines with resistance induced against cis-diamminedichloroplatinum(II) (DDP) and two derivatives of trans-1,2-diaminocyclohexane (DACH) were used for the in vitro tests. DNA synthesis inhibition in both sensitive and resistant cells was tested. The results are compared with DDP and DACH-Pt(II)-4-carboxyphtalate (TMA). Both tested complexes proved their antitumor activity in our experimental systems. The CHA complex was more effective than AMA and its effectiveness is comparable with that of DDP and TMA. Cross-resistance was found between DDP and AMA as well as TMA and CHA. There was no cross-resistance between DDP versus CHA, and TMA versus AMA.  相似文献   
9.
G Lukács  G Balázs  E Uray  F Juhász 《Orvosi hetilap》1991,132(47):2587-2590
During a period of thirty years (1959-1989) 374 patients underwent surgery for differentiated thyroid carcinoma at the 1st Department of Surgery of the University Medical School in Debrecen. Distant metastases were found in the lungs or bones in 36 patients (9.6%). In 20 patients the first clinical sign of the primary disease was the distant metastasis. The aspects of surgical treatment depended on whether the metastases were solitary or multiple, capable or uncapable of radioiodine uptake. Whereas the majority of pulmonary metastases respond well to 131I-treatment the therapy of bone metastases is multidisciplinary. The 5-year survival rate was 47%, the 10-year one 19%.  相似文献   
10.
Summary Data are presented on rates of admission for schizophrenia for the native born and the four largest foreign born populations living in England in 1981 (Irish, Indian, Pakistani and Caribbean born). These data show that, in general, the foreign born have higher rates of admission for schizophrenia, and a higher proportion of all diagnoses accounted for by this disorder than do the native born. The exception is Pakistani born women who have conspicuously low rates. Five hypotheses are examined to account for these differences. The apparently high rates of schizophrenia found for the Indian born of both sexes, and Pakistani born men can be accounted for to a large extent by the demographic differences that exist between them and the native born. The Irish born residents of England have rates comparable with the Irish in Ireland who also show much higher rates than do the native English. There is no completely satisfactory account for the very high rates found for Caribbean born men and women but a combination of adverse post migration experiences and tendency to misdiagnose schizophrenia in this group is offered as a tentative explanation for at least some of the excess. The low rates of admission for schizophrenia of Pakistani women is attributed to a tendency on their part to opt out of the formal mental health system after an initial encounter, possibly to return to their native land.  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