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   6712篇
  免费   320篇
  国内免费   50篇
耳鼻咽喉   58篇
儿科学   62篇
妇产科学   57篇
基础医学   785篇
口腔科学   147篇
临床医学   435篇
内科学   1697篇
皮肤病学   85篇
神经病学   590篇
特种医学   208篇
外科学   1430篇
综合类   26篇
一般理论   4篇
预防医学   296篇
眼科学   55篇
药学   436篇
中国医学   11篇
肿瘤学   700篇
  2023年   57篇
  2022年   112篇
  2021年   169篇
  2020年   87篇
  2019年   135篇
  2018年   161篇
  2017年   104篇
  2016年   142篇
  2015年   174篇
  2014年   198篇
  2013年   238篇
  2012年   353篇
  2011年   388篇
  2010年   246篇
  2009年   214篇
  2008年   340篇
  2007年   347篇
  2006年   354篇
  2005年   319篇
  2004年   308篇
  2003年   302篇
  2002年   324篇
  2001年   205篇
  2000年   191篇
  1999年   170篇
  1998年   75篇
  1997年   56篇
  1996年   47篇
  1995年   36篇
  1994年   37篇
  1993年   41篇
  1992年   104篇
  1991年   111篇
  1990年   80篇
  1989年   107篇
  1988年   84篇
  1987年   90篇
  1986年   58篇
  1985年   51篇
  1984年   42篇
  1983年   45篇
  1981年   22篇
  1979年   30篇
  1978年   25篇
  1977年   22篇
  1976年   22篇
  1973年   29篇
  1972年   29篇
  1971年   28篇
  1969年   21篇
排序方式: 共有7082条查询结果,搜索用时 0 毫秒
991.
992.
The aim of this study was to review the clinical and angiographic outcomes of in situ skeletonized bilateral internal thoracic artery (ITA) grafting for left coronary arterial revascularization using an off-pump technique in 144 consecutive patients. We also assessed the difference between left and right ITA grafting to the left anterior descending coronary artery (LAD). Arrangement of the bilateral ITAs (grafting of the left/right ITA to the LAD) was decided according to the coronary anatomy and quality of the grafts. Early postoperative angiograms were evaluated in 110 patients. The average numbers of anastomoses and bilateral ITA anastomoses per patient were 3.4 and 2.3, respectively. There were no surgical deaths or sternal infection. The left and right ITA were anastomosed to the LAD in 106 (73.6%) and 38 (26.4%) patients, respectively. There were no differences in preoperative conditions and postoperative complications between the left ITA and right ITA to LAD groups. The patencies of the left and right ITAs were 99.1 and 100%, respectively. In situ skeletonized bilateral ITA grafting for left-side revascularization using an off-pump technique was shown to be feasible, producing excellent early clinical and angiographic outcomes. Furthermore, arrangement of bilateral ITAs did not affect outcomes.  相似文献   
993.
Sakura M  Tsukamoto T  Yonese J  Ishikawa Y  Aoki N  Fukui I 《Urology》2006,67(4):845.e11-845.e13
A 19-year-old student who had presented with acute urinary retention was referred to our hospital with biopsy diagnosis of proliferating mesenchymal tumor of the prostate. Magnetic resonance imaging showed enlarged prostatic masses. Suspecting prostate sarcoma, we performed a nerve-sparing radical prostatectomy. Histologic diagnosis of the tumor was prostatic malignant phyllodes tumor. Five months after the operation, bilateral obturator lymph node metastases appeared, which were treated with etoposide, ifosfamide, and cisplatin chemotherapy. After a good response was achieved with four cycles of the chemotherapy, pelvic irradiation was added. Since then, there has been no evidence of recurrence for more than 4 years.  相似文献   
994.
Tsuchiya N  Satoh S  Sato K  Iinuma M  Narita S  Inoue T  Matsuura S  Habuchi T 《The Journal of urology》2006,175(1):230-4; discussion 234
PURPOSE: We assessed the influence of HARDN on residual donor kidney and allograft function, invasiveness and morbidity in elderly living donors. MATERIALS AND METHODS: A total of 89 living donors underwent nephrectomy before September 2004 at our institution. The 18 donors who were 65 years or older included 4 of 27 with ODN and 14 of 62 with HARDN. RESULTS: In older (65 years or older) donors mean operative time, mean blood loss and warm ischemia time in the HARDN group did not differ from those in the ODN group. None of the donors had major complications. Older donors with HARDN had a tendency toward a shorter hospital stay than those with ODN. Postoperative serum creatinine in older donors with HARDN was higher than that in younger donors with HARDN, while there was no difference in postoperative serum creatinine between older donors with HARDN and those with ODN. The frequency of allograft losses tended to be higher in older than in younger kidneys (4 of 18 vs 5 of 71, p = 0.054). However, most allograft losses did not seem to be related to surgical technique. CONCLUSIONS: Although further studies, especially with long-term followup, are necessary, HARDN is suggested to be safe and minimally invasive surgery even in elderly donors and to be comparable to open surgery in terms of morbidity, the residual donor kidney and allograft function.  相似文献   
995.
The supraclinoid segments of the internal carotid artery (ICA) and their surrounding structures were examined under magnification in 25 adult cadavers. Attention was paid to anatomical variations and relationships concerning ipsilateral and contralateral pterional microsurgical approaches to these regions, especially to the origin of the ophthalmic artery. Eighty-four percent of the ophthalmic arteries arose from the supraclinoid segment of the ICA. In the ipsilateral pterional approach, mobilization of the ipsilateral optic nerve was required to see the origin of the ipsilateral ophthalmic artery and the medial aspect of the proximal portion of the supraclinoid segment of the ICA. In the contralateral pterional approach, on the other hand, these areas on the contralateral side could be identified under the optic nerve with minimal or without retraction of the contralateral optic nerve. This was because 71% of the ophthalmic arteries arose from the supero-medial aspect of the ICA, and because there was nothing to intercept the view of the medial aspect of the ICA under the optic nerve. This study supports the usefulness of the contralateral pterional approach to the origin of the ophthalmic artery and the medial aspect of the supraclinoid segment of the ICA. This approach could be useful in certain cases of carotid-ophthalmic aneurysm. The authors' experience with the contralateral pterional approach to carotid-ophthalmic aneurysms is also described.  相似文献   
996.
997.
1. Irregular light falshes were played on to one eye of dark adapted rabbits for periods of 20-80 min. The concentration of 5-hydroxyindol-3-ylacetic acid (5-HIAA) and of 5-hydroxytryptamine (5-HT) were estimated in left and right superior colliculi, thalami and hippocampi. 2. In rabbits exposed to such visual stimuli for 30-60 min, there was an increase in the 5-HIAA content of the colliculus contralateral to the stimulated retina which aberaged 17% (P = 0-02), but no rise was seen if the exposure was shortened to 20 or prolonged to 80 min. At no time was there a difference in 5-HIAA content between right and left thalamus or right and left hippocampus. 3. Stationary or strictly repetitive visual stimuli produced no difference between the 5-HIAA content of left and right superior colliculus. 4. No difference in 5-HT concentration between the two colliculi was found after any form of visual stimulation, nor did any changes occur in the other parts of the brain which were examined. 5. Irregular, prolonged visual stimualtion thus appears to activate tryptaminergic neurones terminating in the colliculi. The possibility is discussed that the 5-HT released at this site might act as a brake to neuronal activity under conditions when habituation to the stimuli is not yet complete.  相似文献   
998.
999.
1000.
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