全文获取类型
收费全文 | 33352篇 |
免费 | 1535篇 |
国内免费 | 130篇 |
专业分类
耳鼻咽喉 | 250篇 |
儿科学 | 511篇 |
妇产科学 | 414篇 |
基础医学 | 4444篇 |
口腔科学 | 1003篇 |
临床医学 | 2294篇 |
内科学 | 8416篇 |
皮肤病学 | 742篇 |
神经病学 | 2406篇 |
特种医学 | 1242篇 |
外科学 | 5411篇 |
综合类 | 136篇 |
一般理论 | 1篇 |
预防医学 | 1181篇 |
眼科学 | 620篇 |
药学 | 2310篇 |
中国医学 | 65篇 |
肿瘤学 | 3571篇 |
出版年
2022年 | 328篇 |
2021年 | 584篇 |
2020年 | 280篇 |
2019年 | 394篇 |
2018年 | 533篇 |
2017年 | 425篇 |
2016年 | 510篇 |
2015年 | 511篇 |
2014年 | 697篇 |
2013年 | 860篇 |
2012年 | 1353篇 |
2011年 | 1546篇 |
2010年 | 804篇 |
2009年 | 776篇 |
2008年 | 1348篇 |
2007年 | 1465篇 |
2006年 | 1524篇 |
2005年 | 1507篇 |
2004年 | 1390篇 |
2003年 | 1485篇 |
2002年 | 1539篇 |
2001年 | 1439篇 |
2000年 | 1444篇 |
1999年 | 1247篇 |
1998年 | 456篇 |
1997年 | 332篇 |
1996年 | 305篇 |
1995年 | 261篇 |
1994年 | 229篇 |
1993年 | 224篇 |
1992年 | 905篇 |
1991年 | 803篇 |
1990年 | 729篇 |
1989年 | 740篇 |
1988年 | 674篇 |
1987年 | 686篇 |
1986年 | 601篇 |
1985年 | 569篇 |
1984年 | 365篇 |
1983年 | 306篇 |
1982年 | 157篇 |
1979年 | 242篇 |
1978年 | 181篇 |
1977年 | 152篇 |
1975年 | 153篇 |
1974年 | 155篇 |
1973年 | 169篇 |
1970年 | 151篇 |
1969年 | 154篇 |
1967年 | 155篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
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
52.
Shigeki Ohgitani Akimitsu Miyauchi Yasuyuki Takagi Yoshio Fujii Takuo Fujita Misa Nakamura Zhi-qiang Zhang Liang Shan Mitsuyo Sasaki Ryuichi Tsukino Toyoharu Yokoi Kennichi Kakudo Tomitaka Nakayama Junya Toguchida Hiroshi Kanoe Shinichi Aizawa Masao S. Sasaki Takashi Nakamura M. Suda K. Tanaka Y. Ogawa N. Tamura A. Yasoda H. Itoh M. Uehira N. Nishimoto T. Takigawa K. Shiota K. Nakao 《Journal of bone and mineral metabolism》1997,15(3):165-171
53.
Takashi Natsuume Norimasa Nakamura Konsei Shino Yukiyoshi Toritsuka Shuji Horibe Takahiro Ochi 《Journal of orthopaedic research》1997,15(6):837-843
We investigated the temporal and spatial expression of transforming growth factor-β in the healing patellar ligament of the rat by immunohistochemistry. The mid-portion of the medial half of the patellar ligament in 14-week-old male Wistar rats was cut transversely with a scalpel. On day 1 after ligament injury, diffuse staining for transforming growth factor-β was observed in the extracellular matrix filling the wound, and the staining in the adjacent ligament tissue was as weak as it was in the normal ligament. On day 3, the intensity of the diffuse extracellular staining decreased, and the staining was observed in correspondence with the cellular distribution in the wound site and in the adjacent uninjured ligament tissue. On day 7, the intense staining was widely distributed over the whole length of the ligament tissue. On day 28, the staining for transforming growth factor-β was still observed at the wound site and in the adjacent uninjured ligament tissue, where the staining was reduced in intensity but still stronger than it was in the normal ligament. On day 56, the expression of transforming growth factor-β was still detectable at the wound site: however, in the adjacent uninjured ligament tissue, it had almost subsided to the normal level. The results of the present study suggest that ligament healing may be accompanied by extensive changes in the expression of transforming growth factor-β over the whole length of ligament tissue. 相似文献
54.
-Hydroperoxy diethyl peroxide, a novel compound found in the tunic of ascidians, has two peroxide moieties per molecule. Since ascidians are a widely served food item in Japan, human exposure to this compound potentially exists in the seafood preparation industries. No toxicological data have so far been published on this compound, and so we determined the intraperitoneal 6-day LD50 in mice and conducted histopathological examinations. The 6-day LD50, was found to be 199 mg/kg with 95% confidence limits of 126–314 mg/kg. Histopathological examination revealed necrosis induced in a variety of cells that had been directly exposed to the compound. These cells included hepatocytes, parenchymal pancreatic cells and fat cells. It is concluded that direct contact with this compound is likely to elicit cellular necrosis of various organs. The specific toxicological effects are probably dependent on the route of exposure. 相似文献
55.
J Nakamura T Matsushima S Tomizawa J Tanabe 《Nihon Kyōbu Shikkan Gakkai zasshi》1991,29(12):1614-1617
A 18-year-old boy was admitted to hospital in an unconsciousness state as a result of taking a large dose of several psychotropic drugs simultaneously in an attempt to commit suicide. Blood studies revealed hypoxia (55.7 mmHg) and hypercapnia (59.7 mmHg). Hypoxia (74.3 mmHg) and hypercapnia (46.7 mmHg) were still present on the fourth day after admission, and the patient was becoming lethargic. Reduced vascular markings in the right upper lung field on chest roentgenogram in spite of hypercapnia suggested that the persistent hypoxia was the result of a pulmonary embolism. This diagnosis was supported by a perfusion defect on 99mTc-MAA scintigram and arterial obstruction in right pulmonary angiogram. Hypercapnia is an unusual finding in pulmonary embolism, and in this case was considered due to depression of respiration by psychotropic drugs. 相似文献
56.
A Hiraoka J Ishikawa H Kitayama T Yamagami H Teshima H Nakamura H Shibata T Masaoka S Ishigami F Taguchi 《Bone marrow transplantation》1991,7(2):107-111
We used a thin-sectioning technique for the electron microscopic detection of viral particles within the cells of urinary sediments in three recipients who developed hemorrhagic cystitis after allogeneic bone marrow transplantation. Results of viral cultures of urine and electron microscopic (EM) observations on urinary sediments were consistent in only one recipient. In this recipient, EM observations revealed many viral particles within the cells of urinary sediments with diameter of about 80 nm corresponding to adenovirus, of which type 11 was produced in viral cultures. In one of the other two recipients many viral particles with a mean diameter of 41.6 nm corresponding to papovavirus were observed, but viral cultures using conventional cells were negative. Re-cultures using HEK cells produced polyomavirus BK. EM observation was a clue to the correct diagnosis. In the remaining recipient, no viral particles were observed within the cells of urinary sediments, suggesting the hemorrhagic cystitis to be of non-viral origin, despite a positive result of viral culture. These results suggest that a thin-sectioning technique on the cells of urinary sediments is important for the differential diagnosis between a viral-induced and non-viral hemorrhagic cystitis. 相似文献
57.
58.
Y Shiokawa M Nobunaga T Saito T Sakita T Miwa K Nakamura A Gunji K Aoki 《Ryūmachi》1991,31(5):554-571
59.
H Sato H Matsuda T Hatakeyama M Okada K Nakamura 《The Journal of cardiovascular surgery》1992,33(2):202-203
Primary pulmonary artery sarcoma is a rare tumor. We present a case report in which the presumptive diagnosis was made preoperatively with magnetic resonance imaging, Doppler color flow methods, and computer tomography. Surgical treatment was successful. 相似文献
60.
S Maeshima H Nakamura M Nishikawa T Murakami T Mitani T Marukawa S Hori T Kozuka M Irimoto 《Clinical imaging》1992,16(2):121-124
Tumors in the area of the adrenal were detected by chance in two patients who underwent a regular physical check-up. On arteriography the tumors were found to be fed by the adrenal artery. The diagnosis was retroperitoneal schwannoma, but in both patients it was difficult to differentiate the schwannoma from an adrenal tumor preoperatively. 相似文献