全文获取类型
收费全文 | 35886篇 |
免费 | 1704篇 |
国内免费 | 142篇 |
专业分类
耳鼻咽喉 | 487篇 |
儿科学 | 652篇 |
妇产科学 | 404篇 |
基础医学 | 4449篇 |
口腔科学 | 1145篇 |
临床医学 | 2473篇 |
内科学 | 7997篇 |
皮肤病学 | 763篇 |
神经病学 | 3519篇 |
特种医学 | 1894篇 |
外国民族医学 | 1篇 |
外科学 | 5597篇 |
综合类 | 125篇 |
一般理论 | 6篇 |
预防医学 | 1116篇 |
眼科学 | 799篇 |
药学 | 2270篇 |
中国医学 | 69篇 |
肿瘤学 | 3966篇 |
出版年
2023年 | 188篇 |
2022年 | 340篇 |
2021年 | 595篇 |
2020年 | 352篇 |
2019年 | 444篇 |
2018年 | 579篇 |
2017年 | 483篇 |
2016年 | 624篇 |
2015年 | 591篇 |
2014年 | 774篇 |
2013年 | 965篇 |
2012年 | 1577篇 |
2011年 | 1614篇 |
2010年 | 989篇 |
2009年 | 841篇 |
2008年 | 1458篇 |
2007年 | 1718篇 |
2006年 | 1570篇 |
2005年 | 1494篇 |
2004年 | 1528篇 |
2003年 | 1434篇 |
2002年 | 1473篇 |
2001年 | 1319篇 |
2000年 | 1429篇 |
1999年 | 1282篇 |
1998年 | 483篇 |
1997年 | 390篇 |
1996年 | 367篇 |
1995年 | 312篇 |
1994年 | 312篇 |
1993年 | 281篇 |
1992年 | 995篇 |
1991年 | 852篇 |
1990年 | 811篇 |
1989年 | 807篇 |
1988年 | 761篇 |
1987年 | 759篇 |
1986年 | 667篇 |
1985年 | 621篇 |
1984年 | 424篇 |
1983年 | 344篇 |
1979年 | 296篇 |
1978年 | 199篇 |
1977年 | 177篇 |
1974年 | 188篇 |
1973年 | 162篇 |
1972年 | 162篇 |
1971年 | 181篇 |
1970年 | 155篇 |
1969年 | 176篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
K Sasai H Iwai T Yoshizawa S Nishimoto Y Shibamoto Y Kitakabu N Oya M Takahashi M Abe 《International journal of radiation biology》1992,62(2):221-227
We have previously reported that KU-2285, a 2-nitroimidazole with a fluorinated N1-substituent (-CH2-CF2CONH(CH2)nOH, n = 2), was a promising hypoxic cell radiosensitizer. In this study the pharmacokinetics of KU-2285 and its related compounds (n = 3 and n = 4) were compared with those of etanidazole (a 2-nitroimidazole with an N1-substituent of -CH2CONH(CH2)nOH, n = 2) and its related compounds (n = 3 and n = 4) to assess the effects of incorporation of a CF2 group. The lipophilicity of the fluorinated compounds was higher than that of etanidazole, as measured by the octanol/water partition coefficient. As the number of CH2 groups increased, the lipophilicity of the compounds in both the KU-2285 and etanidazole series increased. The brain tissue levels of the fluorinated compounds were as low as those of the etanidazole derivatives, while the biological half-lives of the fluorinated compounds in peripheral nervous tissues were shorter than those of related non-fluorinated compounds. 相似文献
63.
Toshiharu Yamagishi Susumu Ishikawa Ichiro Yoshida Akio Ohtaki Toru Takahashi Satoshi Ohki Shuji Sakata Yasuo Morishita 《Surgery today》1997,27(9):874-875
We describe our technique for performing direct thoracoscopic closure of a congenital partial pericardial defect, which was
successfully employed in a 15-year-old boy. This is the first such report of a procedure that is noninvasive and may therefore
become the treatment of choice for patients with a small congenital pericardial defect. 相似文献
64.
K Matsuda Y Kiyota N Tamura M Takahashi H Miki H Suzuki Y Nakagawa Y Satou M Noda T Nakamura 《Kyobu geka. The Japanese journal of thoracic surgery》1990,43(5):389-391
A 64-year-old man, who had an aneurysm of aortic arch associated with the aberrant right subclavian artery, was treated successfully. He was pointed out to have an aneurysm of aortic arch three years ago. Three years later angiograms and computed tomography revealed that it became larger compared with the initial finding. He underwent a replacement of the aortic arch using a woven Dacron graft under open distal method. Aberrant subclavian artery was not involved in the aneurysm. But because the left subclavian artery was involved in it, a woven Dacron graft was interposed between the ascending aorta and left subclavian artery. Postoperative course was uneventful and there were no complications. 相似文献
65.
66.
67.
A severe case of Vogt-Koyanagi-Haradi's disease was treated with a combination therapy of cyclosporin A and steroid. The therapy was successful and showed no side effects. 相似文献
68.
We have shown previously that activin A increases the number of immunoreactive follicle-stimulating hormone (FSH) cells. To further investigate the action of activin A, we examined its effects on anterior pituitary cells fractionated by centrifugal elutriation. Before activin A treatment, FSH cells were widely distributed among various fractions; a higher proportion of FSH cells was found in larger cell fractions (fractions 5-9), and a lower proportion in smaller cell fractions (fractions 2-4). After culture of the cells in each fraction with activin A (10 ng/ml) for 72 h, the number of FSH cells in fraction 4 only was significantly (P less than 0.05) higher by 225% than that in cells cultured without activin A. The amount of FSH secreted into the medium was minimal or undetectable in fractions 1-4. However, FSH secretion tended to be, or was significantly (P less than 0.01 in fraction 9), stimulated by activin A in fractions 5-9, in which the numbers of FSH cells were not significantly affected. These results suggest a dual mode of action of activin A on FSH: activin A increases the number of FSH cells in a specific type(s) of middle-sized cell fraction, and stimulates FSH secretion at least from larger cells without affecting the number of FSH cells. 相似文献
69.
Hiroyuki Ishizu Masatoshi Takahashi Yukifumi Kondo Akihiko Kataoka Takashi Nakamura Kuniaki Okada Hiroyuki Masuko Yasunori Nishida Hideaki Ogawa Ryoji Yokoyama Yutaka Kimura 《Surgery today》1997,27(3):285-287
Magnetic resonance cholangiopancreatography (MRCP) was performed in 35 patients to evaluate the feasibility of its use as a postsurgical imaging technique after resection of the pancreas. The surgical procedures performed were: pancreatoduodenectomy in 22 patients, segmental pancreatectomy in 1, distal pancreatectomy in 7, and pyroluspreserving pancreatoduodenectomy in 5. The pancreatic duct was shown in its entirety in 24 of the 35 patients (68.6%) and was partially visualized in 8 patients (22.9%), but the intrahepatic and extrahepatic bile ducts were visualized completely in all patients. Furthermore, MRCP was able to demonstrate lesions in 3 of 6 patients who had shown clinical evidence of recurrence. The visualization of the pancreatic and bile duct system was satisfactory despite anatomical changes brought about by resection of the pancreas. Thus, we conclude that MRCP is an appropriate follow-up screening test for patients with suspected abnormalities of the biliary and pancreatic duct system. 相似文献
70.
S. Takahashi K. Ishii K. Matsumoto S. Higano T. Ishibashi M. Suzuki K. Sakamoto 《Neuroradiology》1994,36(5):337-339
We reviewed 12 cases of infarcts in the territory of the anterior choroidal artery (AChA) on CT and/or MRI. In each case vascular occlusion in the region was verified angiographically. Although the extent of the lesion on CT/MR images was variable, all were located on the axial images within an arcuate zone between the striatium anterolaterally and the thalamus posteromedially. The distribution of the lesions on mutiplanar MRI conformed well to the territory of the AChA demonstrated microangiographically. The variability of the extent of the infarcts may be explained by variations in the degree of occlusive changes in the AChA or the development of collateral circulation through anastomoses between the AChA and the posterior communicating and posterior cerebral arteries. The extent of the lesion appeared to be closely related to the degree of neurological deficit. 相似文献