全文获取类型
收费全文 | 35199篇 |
免费 | 1607篇 |
国内免费 | 134篇 |
专业分类
耳鼻咽喉 | 262篇 |
儿科学 | 547篇 |
妇产科学 | 430篇 |
基础医学 | 4647篇 |
口腔科学 | 1053篇 |
临床医学 | 2438篇 |
内科学 | 8822篇 |
皮肤病学 | 801篇 |
神经病学 | 2533篇 |
特种医学 | 1307篇 |
外科学 | 5787篇 |
综合类 | 141篇 |
一般理论 | 1篇 |
预防医学 | 1234篇 |
眼科学 | 631篇 |
药学 | 2489篇 |
中国医学 | 68篇 |
肿瘤学 | 3749篇 |
出版年
2023年 | 164篇 |
2022年 | 352篇 |
2021年 | 629篇 |
2020年 | 306篇 |
2019年 | 427篇 |
2018年 | 576篇 |
2017年 | 464篇 |
2016年 | 538篇 |
2015年 | 545篇 |
2014年 | 752篇 |
2013年 | 929篇 |
2012年 | 1464篇 |
2011年 | 1676篇 |
2010年 | 892篇 |
2009年 | 840篇 |
2008年 | 1453篇 |
2007年 | 1571篇 |
2006年 | 1629篇 |
2005年 | 1618篇 |
2004年 | 1480篇 |
2003年 | 1582篇 |
2002年 | 1638篇 |
2001年 | 1479篇 |
2000年 | 1482篇 |
1999年 | 1296篇 |
1998年 | 474篇 |
1997年 | 345篇 |
1996年 | 316篇 |
1995年 | 272篇 |
1994年 | 241篇 |
1993年 | 228篇 |
1992年 | 921篇 |
1991年 | 819篇 |
1990年 | 744篇 |
1989年 | 752篇 |
1988年 | 691篇 |
1987年 | 701篇 |
1986年 | 620篇 |
1985年 | 586篇 |
1984年 | 374篇 |
1983年 | 308篇 |
1982年 | 164篇 |
1979年 | 256篇 |
1978年 | 187篇 |
1977年 | 159篇 |
1975年 | 153篇 |
1974年 | 155篇 |
1973年 | 174篇 |
1969年 | 154篇 |
1967年 | 161篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
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
62.
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
63.
64.
Y Shiokawa M Nobunaga T Saito T Sakita T Miwa K Nakamura A Gunji K Aoki 《Ryūmachi》1991,31(5):554-571
65.
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
66.
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
67.
H Nakamura H Masutani Y Tagaya A Yamauchi T Inamoto Y Nanbu S Fujii K Ozawa J Yodoi 《Cancer》1992,69(8):2091-2097
Adult T-cell leukemia-derived factor (ADF), originally defined as an interleukin-2 receptor inducer, is a human thioredoxin homologue. ADF is detected in many malignant tissues and has a growth-promoting effect on transformed cells. In this study, ADF expression was examined immunohistochemically in human liver cell lines and liver tissues, and its growth-promoting effect was tested on human hepatoma cells. On three liver cell line--PLC/PRF/5, HepG2, and Chang liver cells--ADF stained positively and also was detected by immunoblotting. ADF had strong staining in the fetal liver (n = 8), although it was faint in the normal adult liver (n = 6). In hepatocellular carcinoma (n = 25), ADF expression generally was enhanced and was very strong in 52% (13 of 25) of the cases, although it was moderate in cases of chronic hepatitis or cirrhosis. ADF augmented the growth of PLC/PRF/5 cells and showed an additive effect with epidermal growth factor. These results indicate possible involvement of ADF in cell activation and growth of hepatocytes, as is the case with lymphocytes. 相似文献
68.
A 52-year-old woman who developed acute transverse myelopathy following systemic lupus erythematosus (SLE) was reported. At the age of 46, she was diagnosed as having atypical psychosis. Neurological examination revealed mild depressive state, paraparesis, diffuse hyperreflexia, hypesthesia below the breasts, and urinary disturbance. Gait was slightly ataxic and Romberg sign was positive. Laboratory study disclosed lymphocytopenia, positive antinuclear antigen, false positive Venereal Disease Research Laboratories flocculation test and prolonged activated partial thromboplastin time. IgG anticardiolipin antibody (aCLA) was positive, whereas IgM aCLA was negative. Cerebrospinal fluid was normal except the elevation of %IgG. Nerve conduction studies were normal and no abnormality was detected in the brain and spinal cord by MRI and CT. We treated her by two series of steroid pulse therapy, which resulted in marked improvement of symptoms and disappearance of aCLA. Before and after the pulse therapy, symptoms were fluctuated in parallel with the levels of aCLA. These findings suggest the relation of aCLA to the transverse myelopathy in SLE. This is the first case report of a good prognosis of myelopathy in a SLE patient who was treated by steroid pulse therapy with the aim of disappearance of aCLA. 相似文献
69.
Koichi Murata Yasuaki Nakagawa Takashi Suzuki Masahiko Kobayashi Seiya Kotani Takashi Nakamura 《Knee surgery, sports traumatology, arthroscopy》2007,15(10):1261-1263
Intraosseous ganglia of the glenoid are rare, and their etiology is unknown. This report describes a case of an intraosseous
ganglion about to cause fracture of the glenoid. The patient was a 61-year-old woman with a painful left shoulder with a limited
range of motion. Her symptoms did not improve after non-operative treatment. Arthroscopic examination showed a cartilage defect
and erosion in the posteroinferior portion of the glenoid, behind which computed tomography (CT) showed a cystic lesion of
the glenoid. There was no communication between the cyst and the joint space. The patient was treated by curettage and an
autogenous cancellous bone graft from the iliac crest. Two years after the operation, the patient was almost free from pain,
and CT showed good integration of the bone graft. 相似文献
70.