全文获取类型
收费全文 | 173935篇 |
免费 | 12162篇 |
国内免费 | 6147篇 |
专业分类
耳鼻咽喉 | 2099篇 |
儿科学 | 3474篇 |
妇产科学 | 4621篇 |
基础医学 | 24637篇 |
口腔科学 | 4412篇 |
临床医学 | 17032篇 |
内科学 | 29540篇 |
皮肤病学 | 2863篇 |
神经病学 | 10933篇 |
特种医学 | 6129篇 |
外国民族医学 | 47篇 |
外科学 | 21976篇 |
综合类 | 15225篇 |
现状与发展 | 7篇 |
一般理论 | 39篇 |
预防医学 | 12445篇 |
眼科学 | 4223篇 |
药学 | 16311篇 |
64篇 | |
中国医学 | 4390篇 |
肿瘤学 | 11777篇 |
出版年
2023年 | 1212篇 |
2022年 | 2845篇 |
2021年 | 3783篇 |
2020年 | 2762篇 |
2019年 | 2942篇 |
2018年 | 3602篇 |
2017年 | 2916篇 |
2016年 | 2914篇 |
2015年 | 4120篇 |
2014年 | 4965篇 |
2013年 | 5057篇 |
2012年 | 7544篇 |
2011年 | 8115篇 |
2010年 | 5042篇 |
2009年 | 4133篇 |
2008年 | 6131篇 |
2007年 | 6440篇 |
2006年 | 6470篇 |
2005年 | 5857篇 |
2004年 | 5016篇 |
2003年 | 5028篇 |
2002年 | 4614篇 |
2001年 | 8391篇 |
2000年 | 8311篇 |
1999年 | 7003篇 |
1998年 | 2795篇 |
1997年 | 2269篇 |
1996年 | 1599篇 |
1995年 | 1544篇 |
1994年 | 1383篇 |
1993年 | 1066篇 |
1992年 | 4098篇 |
1991年 | 4097篇 |
1990年 | 3784篇 |
1989年 | 3775篇 |
1988年 | 3582篇 |
1987年 | 3395篇 |
1986年 | 3198篇 |
1985年 | 3042篇 |
1984年 | 2079篇 |
1983年 | 1819篇 |
1979年 | 1919篇 |
1978年 | 1186篇 |
1975年 | 1191篇 |
1974年 | 1358篇 |
1973年 | 1413篇 |
1972年 | 1357篇 |
1971年 | 1247篇 |
1970年 | 1137篇 |
1969年 | 1121篇 |
排序方式: 共有10000条查询结果,搜索用时 8 毫秒
21.
22.
The clinical, radiologic, and histopathologic findings of a case of bilateral dacryops is reported in a 49-year-old man. The patient presented with cystic masses located in superior lateral orbits and underwent bilateral excisions of these without any postoperative complications. 相似文献
23.
A patient with Graves' disease had a symptomatic thrombocytopathy during periods of remission. When euthyroid, she noticed bruising, petechiae, and epistaxis. Hemostatic abnormalities included prolongation of the bleeding time by aspirin, reduced platelet retention (a second-phase defect), and abnormal thrombin-induced aggregation and serotonin release. When hyperthyroid, bleeding symptoms resolved, and platelet function returned to normal. These observations suggest that mild bleeding disorders may be influenced either directly or indirectly by thyroid hormone levels. 相似文献
24.
Measurements of the fetal eyeball and its pattern of growth 总被引:1,自引:0,他引:1
25.
26.
27.
Acupuncture analgesia (AA) caused by low frequency stimulation of the acupuncture point (AP) was abolished by hypophysectomy and adrenalectomy. Termination of the AA producing pathway from the AP to the pituitary gland was in the medial hypothalamic arcuate nucleus (M-HARN). The origin of the descending pain inhibitory system associated with AA was in the posterior HARN (P-HARN). AA in the hypophysectomized rats, and enhanced neuronal activity in the P-HARN that were abolished during acupuncture stimulation, were both restored by intraperitoneal microinjection of 0.5 mg/kg morphine or 0.1 micrograms beta-endorphin into the P-HARN during acupuncture stimulation. Of the analgesia produced by dopamine or beta-endorphin injected into the P-HARN, that caused by beta-endorphin disappeared after denervation of the M-HARN. The P-HARN neurons that responded to acupuncture stimulation also responded to iontophoretic dopamine, but not to iontophoretic morphine nor ultramicroinjected beta-endorphin. The transmission between the M-HARN and P-HARN may be dopaminergic, and beta-endorphin might presynaptically modulate this transmission. Reduction of sodium ions may have been the reason for abolition of AA after adrenalectomy. 相似文献
28.
Computed tomographic (CT) scans of the brain in a child with Smith-Lemli-Opitz syndrome revealed enlargement of the ventricular system, hypoplasia of the cerebellum, and abnormal thickening of the gray matter, consistent with pachygyria. These findings have been previously noted in autopsies performed on patients with this disorder. We conclude that CT scanning is a valuable tool in the evaluation of children suspected of having the Smith-Lemli-Opitz syndrome. 相似文献
29.
Normal seminal vesicles were studied histologically in 80, and by Feulgen’s cytophotometric method in 10 autopsied cases (males,
44–82 years of age). In every case large, hyperchromatic nuclei were found. By cytophotometry euploid polyploid atypia was
also shown in every case, which is characteristic of benign hormonal dysplasia. 相似文献
30.
K Mahmood M N Chowdhury E A Ayoola I A Mofleh R S Rashed F Z Faleh 《Tropical gastroenterology》1991,12(4):188-191
Seventy seven antral biopsies were collected from patients attending endoscopy clinic at King Khalid University Hospital, Riyadh, Saudi Arabia during a period of six months between December 1988 to May 1989. Of these 69 (89.6%) showed chronic gastritis as well as Helicobacter-like organisms (HLOs) in the biopsy specimens while 63 (81.8%) of biopsies grew Helicobacter pylori on culture. These findings indicate a good correlation between the histological diagnosis of chronic gastritis and isolation of H. pylori on culture. 相似文献