全文获取类型
收费全文 | 18221篇 |
免费 | 805篇 |
国内免费 | 151篇 |
专业分类
耳鼻咽喉 | 135篇 |
儿科学 | 272篇 |
妇产科学 | 309篇 |
基础医学 | 2255篇 |
口腔科学 | 453篇 |
临床医学 | 1152篇 |
内科学 | 4464篇 |
皮肤病学 | 360篇 |
神经病学 | 1377篇 |
特种医学 | 925篇 |
外科学 | 3527篇 |
综合类 | 59篇 |
一般理论 | 1篇 |
预防医学 | 437篇 |
眼科学 | 240篇 |
药学 | 1080篇 |
中国医学 | 27篇 |
肿瘤学 | 2104篇 |
出版年
2023年 | 117篇 |
2022年 | 230篇 |
2021年 | 412篇 |
2020年 | 242篇 |
2019年 | 274篇 |
2018年 | 345篇 |
2017年 | 286篇 |
2016年 | 346篇 |
2015年 | 377篇 |
2014年 | 534篇 |
2013年 | 660篇 |
2012年 | 1026篇 |
2011年 | 1082篇 |
2010年 | 583篇 |
2009年 | 496篇 |
2008年 | 962篇 |
2007年 | 993篇 |
2006年 | 970篇 |
2005年 | 1040篇 |
2004年 | 1005篇 |
2003年 | 988篇 |
2002年 | 973篇 |
2001年 | 431篇 |
2000年 | 459篇 |
1999年 | 374篇 |
1998年 | 243篇 |
1997年 | 184篇 |
1996年 | 192篇 |
1995年 | 146篇 |
1994年 | 145篇 |
1993年 | 126篇 |
1992年 | 260篇 |
1991年 | 267篇 |
1990年 | 229篇 |
1989年 | 278篇 |
1988年 | 230篇 |
1987年 | 225篇 |
1986年 | 199篇 |
1985年 | 163篇 |
1984年 | 111篇 |
1983年 | 93篇 |
1982年 | 52篇 |
1981年 | 52篇 |
1979年 | 81篇 |
1978年 | 75篇 |
1977年 | 52篇 |
1975年 | 54篇 |
1974年 | 52篇 |
1972年 | 59篇 |
1971年 | 57篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
Y Shiokawa M Nobunaga T Saito T Sakita T Miwa K Nakamura A Gunji K Aoki 《Ryūmachi》1991,31(5):554-571
32.
33.
Kazuhiro Masada Masataka Yasuda Eiji Takeuchi Hideo Hashimoto 《Nordisk plastikkirurgisk forening [and] Nordisk klubb for handkirurgi》2003,37(3):155-158
We did 18 arthrodeses of the wrist in 16 patients with rheumatoid arthritis using an intramedullary fixation technique. There were 15 women and one man, whose ages at operation ranged from 47 to 71 years (mean 58). Follow up ranged from 13 to 68 months (mean 27). The operative technique consists of a combination of intramedullary placement of two Kirschner (K)-wires and an autogenous bone graft. At follow up bony union was apparent in all cases. K-wires came out of the metacarpal joints in two cases. Paraesthesiae in the median nerve distribution occurred in two cases which both recovered within three months. 相似文献
34.
Myocardial protective effect of lidocaine during experimental off-pump coronary artery bypass grafting. 总被引:1,自引:0,他引:1
Kazuhiro Hinokiyama Nobuo Hatori Masami Ochi Tadaaki Maehara Shigeo Tanaka 《Annals of thoracic and cardiovascular surgery》2003,9(1):36-42
Off-pump coronary artery bypass grafting (OPCABG) has recently gained popularity. During OPCABG, patients remain vulnerable to ischemic-reperfusion injury due to a temporary coronary occlusion without any active cardioprotection. Some strategies such as ischemic preconditioning (IP) and an intracoronary shunt have been applied with a view to minimizing the effects of ischemia, but the effects of these strategies remain controversial. This study was carried out to investigate the protective effect of lidocaine against myocardial ischemic-reperfusion injury. Twenty-one pigs were assigned to three groups, each consisting of seven pigs. In the control group, using a left internal thoracic artery (LITA) bypass circuit, the left anterior descending coronary artery (LAD) was occluded for 45 min followed by two hours of reperfusion. In the IP group, five min of occlusion followed by 15 min of reperfusion was performed. In the lidocaine group, 2 mg/kg of lidocaine was administered directly into the LAD just before the LAD occlusion. Infarct size expressed as a percentage of the area at risk was significantly smaller in the lidocaine group (2.7+/-4.2%) than in the control group (79.9+/-6.0%, p<0.001) or the IP group (57.0+/-25.9%, p<0.001). Lidocaine exhibited a potent myocardial protective effect in the present OPCABG model. 相似文献
35.
The actions of metaraminol on the secretion of fluid and glycoproteins from rat submandibular glands were investigated using phentolamine, propranolol and reserpine. Metaraminol at doses from 1 to 8 mg/kg (i.p.) increased the salivation and the amounts of protein in submandibular saliva in a dose-dependent manner. The salivation induced by metaraminol at 2 mg/kg was inhibited strongly by pretreatment with propranolol, whereas the salivation induced by metaraminol at 8 mg/kg was inhibited strongly by phentolamine. Reserpine inhibited the secretion of fluid caused by both doses of metaraminol. The electrophoretic profiles of saliva evoked by metaraminol at 2 mg/kg revealed two main bands of glycoprotein, I and IV, which originated from the acinus, and the intensities of these bands were decreased by treatment with propranolol, whereas the major band in saliva induced by 8 mg/kg of metaraminol was glycoprotein III, which originated from the granular tubules. The intensity of band III was decreased by pretreatment with phentolamine. These results suggest that metaraminol, at small doses, stimulates mainly the beta-adrenoceptor in the acinus, whereas at large doses, it prominently stimulates the alpha-adrenoceptors in the granular tubules, although metaraminol at small and large doses is able to stimulate alpha- and beta-adrenoceptors in rat submandibular gland. 相似文献
36.
Y Banya T Abe H Sasaki H Aoki T Fujioka T Akasaka T Kubo T Ohori 《Hinyokika kiyo. Acta urologica Japonica》1986,32(3):454-461
We present a case of primary ureteral carcinoma in the duplicated renal pelvis and ureter diagnosed by transurethral uretero-renoscopy. The case was of a 78-year-old man with the complaint of sudden asymptomatic macrohematuria. An excretory urogram strongly suggested the presence of duplication of the right collecting system, and cystoscopy revealed a gross hematuria from the right ureteral orifice. A retrograde ureteropyelogram revealed incomplete duplication of the right renal pelvis and ureter fused at about the ureter crossing over the iliac vessels, and a polyp-like filling defect in the lower segment of duplicated ureter at about 4 cm from the fusion of the ureters. Transurethral uretero-renoscopy was employed to investigate the filling defect, and a papillary tumor extended into the lower segment of duplicated ureter was revealed. Tumor was resected by a rigid operating instrument under transurethral uretero-renoscopy. The pathological diagnosis was grade I-transitional cell carcinoma of the ureter, so that right total nephroureterectomy with partial cystectomy was carried out subsequently. Surgical specimen after right total nephroureterectomy with partial cystectomy showed no other tumor in the pelvis or ureter macroscopically, and histopathological studies of surgical specimens were no evidence of malignancy. We believe that transurethral uretero-renoscopy significantly increases the diagnostic accuracy in determining the nature of upper urinary tract lesions, and this procedure is indispensable in the diagnosis of ureteral tumors. The present case was the 7th case of primary ureteral carcinoma in the duplicated renal pelvis and ureter in the Japanese literature. 相似文献
37.
38.
A case of a bilateral pulmonary hernia of the lungs into the supraclavicular fossae is described. A man, aged 79, with severe chronic asthma and chronic bronchitis due to air pollution, complained of a cervical mass off and on for several years. The herniation was greater on the right side. It could be identified on physical examination by the presence of a soft painless supraclavicular bulge which was exaggerated by strain or cough. Radiologically this herniation could best be identified on lateral cervical roentgenogram. It is said that cervical lung hernia is a rare condition, but in our experience supraclavicular herniation of the lung is not unusual in cases of severe chronic obstructive lung disease. 相似文献
39.
N Aoki 《Neurological research》1992,14(3):252-254
An eight-month-old boy with clinical features of acute encephalopathy with symmetrical low-density areas in the thalami and the putamen on computed tomography is presented. These particular computed tomography features suggest potential aetiology common to acute encephalopathy with low-density areas in the thalami and infantile bilateral striatal necrosis with an acute onset. The therapeutic consideration of these conditions is also discussed. 相似文献
40.
The contribution of sarcoplasmic reticulum was studied with regard to the increase in arterial contraction induced by a high-potassium depolarization in spontaneously hypertensive rats (SHR). The 20 mmol/l potassium-induced contraction of femoral arteries was faster and greater in 6-week-old SHR than in age-matched normotensive Wistar-Kyoto (WKY) rats. Relaxation after washing the arteries with a Krebs solution was slower in SHR than in WKY rats. When the sarcoplasmic reticulum of SHR arteries had been depleted of calcium by caffeine in a calcium-free solution, the rate of high-potassium-induced contraction of the calcium-depleted SHR arteries was slowed, the same result as that with non-calcium-depleted WKY arteries. In ryanodine-treated arteries, the rate and magnitude of high-potassium-induced contraction were enhanced slightly in SHR and greatly in WKY rats, resulting in no final difference between SHR and WKY rats. Ryanodine slowed the relaxation rate in WKY rats but not in SHR. These results suggest that the diminution in ability of sarcoplasmic reticulum to sequester calcium may be responsible for the faster rate and greater magnitude of high-potassium-induced contraction with the slower relaxation in SHR arteries. We postulated that genetic malfunction of sarcoplasmic reticulum causes the increased contraction of arterial smooth muscle leading to the enhanced vasoconstriction and elevated blood pressure in SHR. 相似文献