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   1004篇
  免费   73篇
  国内免费   24篇
耳鼻咽喉   6篇
儿科学   55篇
妇产科学   13篇
基础医学   127篇
口腔科学   11篇
临床医学   79篇
内科学   303篇
皮肤病学   22篇
神经病学   44篇
特种医学   83篇
外科学   95篇
综合类   51篇
预防医学   52篇
眼科学   12篇
药学   83篇
中国医学   2篇
肿瘤学   63篇
  2022年   8篇
  2021年   24篇
  2020年   10篇
  2019年   8篇
  2018年   12篇
  2017年   13篇
  2016年   12篇
  2015年   17篇
  2014年   19篇
  2013年   33篇
  2012年   37篇
  2011年   50篇
  2010年   33篇
  2009年   25篇
  2008年   45篇
  2007年   47篇
  2006年   41篇
  2005年   34篇
  2004年   25篇
  2003年   31篇
  2002年   32篇
  2001年   26篇
  2000年   27篇
  1999年   30篇
  1998年   30篇
  1997年   24篇
  1996年   25篇
  1995年   20篇
  1994年   16篇
  1993年   16篇
  1992年   31篇
  1991年   31篇
  1990年   27篇
  1989年   23篇
  1988年   25篇
  1987年   18篇
  1986年   21篇
  1985年   19篇
  1984年   15篇
  1983年   12篇
  1982年   8篇
  1977年   10篇
  1976年   5篇
  1974年   5篇
  1972年   12篇
  1971年   5篇
  1970年   7篇
  1969年   9篇
  1967年   10篇
  1966年   5篇
排序方式: 共有1101条查询结果,搜索用时 31 毫秒
1.
A case of seminoma in a monorchid adult guinea fowl (Numida meleagris) is described. Grossly, a right enlarged testis, which was soft in consistency, and white to pale in colour with few spots of haemorrhages was observed. Histologically, the testicle revealed diffusely spread sheets of tumour cells. The cells were large pleomorphic with eccentrically placed hyperchromic nuclei. Mitotic figures were evident. A scanty fibrous stroma, containing lymphocytes and histiocytes, separating the groups of tumour cells, along with few areas of haemorrhages were observed. Occurrence of seminoma in guinea fowl is unusual and hence reported.  相似文献   
2.
Intratemporal vascular tumors: detection with CT and MR imaging   总被引:1,自引:0,他引:1  
The diagnostic contributions of computed tomography (CT) and magnetic resonance (MR) imaging were compared in 12 patients with benign intratemporal vascular tumors (hemangioma or vascular malformation). The tumors included six in the internal acoustic canal and six in the geniculate ganglion region. Clinical and histologic correlations were made. Two of the six patients with tumors in the internal acoustic canal underwent CT, and both required gas cisternography to show the tumor. Five patients in that group underwent MR imaging, and all five studies showed the tumor. All six patients with geniculate ganglion tumors underwent CT. Results in one study were questionable, and five showed the tumor. Five patients in this group underwent MR imaging, but the MR findings were positive in only two cases. MR imaging should therefore be performed before CT in the evaluation of facial nerve dysfunction, as it demonstrated all tumors in the internal acoustic canal and some in the geniculate ganglion region. If MR findings are negative, CT should then be performed to rule out a possible geniculate ganglion lesion.  相似文献   
3.
4.
We present an interesting case of paroxysmal hypertension in a young male caused by malignant pheochromocytoma. This patient, who had history of paroxysms of abdominal pain with severe hypertension, developed osseous metastasis in the first lumbar vertebra resulting in collapse of the vertebra and it caused paraplegia. The diagnosis of pheochromocytoma was confirmed on histopathology.  相似文献   
5.
6.
Thirty-five patients hospitalized for recent angiographically documented arterial occlusion in the legs (27 femoropopliteal arteries and eight grafts) benefited from local fibrinolytic therapy delivered at the site of the occlusion with a 4- or 5-F catheter. This therapy combined a continuous urokinase (UK) infusion of 1,000 U/kg/hour and a lysyl plasminogen (LYS-PLG) infusion of 15 microkatals every 30 minutes. Angiographically confirmed lysis was obtained in 85% of the cases. Only 3% of the patients had major and 6% had minor groin hematomas. Only two patients had concentrations of fibrinogen as low as 100 mg/dl. Intravascular infusion of UK-LYS-PLG is as effective as streptokinase. Its excellent tolerance makes it a good alternative in the treatment of acute ischemia in the lower limbs.  相似文献   
7.
A retrospective analysis of 328 cases of Hodgkin's Disease (HD) subjected to a staging laparotomy at the Tata Memorial Hospital, Bombay, India, from 1974 to 1986 was undertaken to assess its relevance to our setup. Eighty percent of the patients were from clinical stages (CS) I and II, 38% with lymphocyte predominance (LP), and 41% with mixed cellularity (MC) histologies. Staging laparotomy was positive in 60% cases overall, including 50% from CS IA and IIA, 68% from CS IB and IIB, and 53% and 67%, respectively, from LP and MC histologies. Splenic involvement was seen in 54% cases. Operative complications were encountered in 2% of cases and deaths in two cases only. In view of the high propensity for abdominal spread, only selected CS IA and IIA cases would merit a staging laparotomy within which, nearly 50% cases with a negative yield could be offered radical segmental irradiation alone for cure. The majority of our patients would, however, require combination therapy.  相似文献   
8.
9.
Although nausea and vomiting are diagnostic migraine symptoms, most patients can take tablets by mouth and a few say they can eat some food. This study was conducted to determine the proportion who could eat or drink, what was consumable and with what effect. One-hundred-and-nine migraineurs were asked what they could eat or drink at the beginning or height of their attacks; 59 could not take any food by mouth, but 50 could eat during the headache phase of their migraine attacks. Four ate normally, 5 took smaller amounts of their normal dietary intake, and 3 took lighter meals. Dry, carbohydrate foods were consumable by the remaining 38: a few had specific cravings, most stated the precise variety which, when eaten, reduced nausea, headache, other symptoms or length of attacks. Patients should therefore be encouraged to eat what they can tolerate, with their tablets taken as early as possible after the onset of attacks. Simultaneous nausea, tolerance or even craving for specific foods occur in other conditions, particularly high altitude headaches which share other features of migraine attacks. The observations in this paper support the notion that migraine is a central neuronal metabolic disturbance.  相似文献   
10.
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