全文获取类型
收费全文 | 19425篇 |
免费 | 843篇 |
国内免费 | 88篇 |
专业分类
耳鼻咽喉 | 185篇 |
儿科学 | 333篇 |
妇产科学 | 392篇 |
基础医学 | 2607篇 |
口腔科学 | 359篇 |
临床医学 | 1172篇 |
内科学 | 4615篇 |
皮肤病学 | 272篇 |
神经病学 | 1811篇 |
特种医学 | 797篇 |
外科学 | 3035篇 |
综合类 | 82篇 |
一般理论 | 5篇 |
预防医学 | 645篇 |
眼科学 | 387篇 |
药学 | 1206篇 |
中国医学 | 21篇 |
肿瘤学 | 2432篇 |
出版年
2022年 | 177篇 |
2021年 | 306篇 |
2020年 | 169篇 |
2019年 | 231篇 |
2018年 | 289篇 |
2017年 | 242篇 |
2016年 | 264篇 |
2015年 | 296篇 |
2014年 | 378篇 |
2013年 | 498篇 |
2012年 | 819篇 |
2011年 | 830篇 |
2010年 | 449篇 |
2009年 | 411篇 |
2008年 | 701篇 |
2007年 | 827篇 |
2006年 | 799篇 |
2005年 | 759篇 |
2004年 | 737篇 |
2003年 | 742篇 |
2002年 | 812篇 |
2001年 | 654篇 |
2000年 | 724篇 |
1999年 | 662篇 |
1998年 | 250篇 |
1997年 | 196篇 |
1996年 | 194篇 |
1995年 | 185篇 |
1994年 | 187篇 |
1993年 | 172篇 |
1992年 | 626篇 |
1991年 | 546篇 |
1990年 | 540篇 |
1989年 | 553篇 |
1988年 | 495篇 |
1987年 | 479篇 |
1986年 | 431篇 |
1985年 | 436篇 |
1984年 | 244篇 |
1983年 | 205篇 |
1982年 | 89篇 |
1979年 | 229篇 |
1978年 | 125篇 |
1977年 | 99篇 |
1975年 | 98篇 |
1974年 | 96篇 |
1973年 | 97篇 |
1970年 | 100篇 |
1969年 | 114篇 |
1968年 | 94篇 |
排序方式: 共有10000条查询结果,搜索用时 10 毫秒
1.
2.
3.
Takako Miyamae Masaaki Mori Yasuji Inamo Youichi Kohno Shuji Takei Motoharu Maeda Takuji Murata Shuji Nakata Hiroshi Kawai Yukiko Hirano Yukiji Date Katsuhiko Kitamura Shumpei Yokota 《Ryūmachi》2003,43(3):538-543
OBJECTIVES: To reveal the frequency and the clinical characteristics of dystrophic calcification that occurs in children with juvenile dermatomyositis, multi-center analysis was constructed. METHOD: Fifty children with JDM were enrolled, and 14 of them (28.0%) were complicated with calcinosis. Clinical symptoms and laboratory tests at onset, initial therapy and disease course were compared in children with and without calcinosis. RESULTS: The mean age of the onset of calcinosis was 4.78 +/- 3.33 years, and it was younger than those of children without calcinosis (8.66 +/- 3.85 years) (P = 0.0017). No differences of clinical manifestation except Gower's sign were observed. The frequency of positive anti-nuclear antibody was 7.1% in children with calcinosis and 52.9% without calcinosis (P = 0.0112). The initial therapy of methylprednisolon pulses gave no effects on prognosis of calcium deposition. The calcinosis appeared in 1.56 +/- 1.91 year after the onset of the disease. The various types of calcium deposition including large tumorous clumps, subcutaneous plaques or nodules, sheet-type calcification were deserved. They appeared over knee joints (64.3%), elbow joint (64.3%), and hip processes (50.0%). Calcinosis affecting the subcutaneous tissues frequently resulted in painful superficial ulceration of the overlying skin (42.9%), local infection (50.0%), and limitation of joint movement (14.3%). Although aluminum phosphate was effective in 2 children among 7, no other effective treatment was recommended. In 5 cases, surgical removal of tumorous clumps was operated. Thus, juvenile dermatomyositis is frequently complicated with calcinosis. This type of calcinosis was found to be unlikely to resolve completely, and resulted in severe disability in children. 相似文献
4.
M Kitamura T Nishihira K Hirayama S Kawachi T Kano T Akaishi R Shineha Y Sekine K Sanekata S Mori 《[Zasshi] [Journal]. Nihon Kyōbu Geka Gakkai》1989,37(1):17-24
From 1976 to 1985, 277 cases of carcinoma of the esophagus were resected in the Second Department of Surgery, Tohoku University School of Medicine. Postoperative cardiocirculatory disturbances occurred in 114 cases (41.2%), arrhythmia being the disturbance most frequently observed (86.8%). Low cardiac output syndrome occurred in 8 cases and myocardial infarction occurred in 3 cases. The majority of the cases were treated successfully, but 5 patients died within one month after operation. Causes of death were as follows: myocardial infarction, constrictive pericarditis, cardiac tamponade, non-occlusive mesenteric ischemia and acute cardiac failure. Postoperative arrhythmia occurred mainly up to the third postoperative day. Low cardiac output syndrome occurred just after operation or on the first postoperative day. All cases of myocardial infarction occurred on the first postoperative day. The rate of occurrence of cardiocirculatory disturbances in aged patients (greater than or equal to 70) was significantly higher than other group (less than or equal to 69), (56.7%:38.1%, p less than 0.05). The rate of occurrence of cardiocirculatory disturbances in patients who had a history of hypertension or in patients with abnormal preoperative electrocardiographic findings were relatively higher than those in patients who had no history of hypertension or in patients with no abnormal preoperative electrocardiographic findings. The rate of occurrence of cardiocirculatory disturbances in patients who had undergone total resection of the thoracic esophagus was significantly higher than that in patients who had undergone partial resection of the thoracic esophagus (42.8%:23.8%, p less than 0.05).(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献
5.
6.
7.
N Mori 《Nihon Shokakibyo Gakkai zasshi》1987,84(5):1057-1067
8.
9.
Y Taki T Morimoto A Tanaka M Noguchi W Y Wang T Nishihira K Nishikawa K Mori K Ozawa 《The Journal of surgical research》1990,48(1):56-60
Ketogenic capacity of mitochondria from the remnant liver of 70% hepatectomized rats was studied in relation to mitochondrial phosphorylative activity. Ketogenic capacity increased to a maximum of 6.04 +/- 0.39 from 3.84 +/- 0.13 of control, with an enhancement of mitochondrial phosphorylative activity 6 hr after hepatectomy, and then decreased to normal levels within 24 hr. Adenylate energy charge, (ATP + 1/2ADP)/(ATP + ADP + AMP), of the remnant liver decreased to 0.825 +/- 0.006 as compared to 0.849 +/- 0.002 of control 6 hr after operation. At 12 hr, total ketone body concentrations of the arterial blood increased concomitant with a fall in ketone body ratio (acetoacetate/3-hydroxybutyrate) which reflects the decreased liver mitochondrial redox (NAD+/NADH) state. These findings suggest that an enhancement of mitochondrial fatty acid oxidation and ketogenesis occurs concomitant with an enhancement of mitochondrial phosphorylative activity in the remnant liver in response to a decreased energy charge after 70% hepatectomy. 相似文献
10.
Using high resolution ultrasonography (US), diagnostic accuracy of thrombi in each venous segment of lower limbs and qualitative evaluation of thrombi in deep vein thrombosis (DVT) were investigated. The subjects were 106 lower limbs in 81 patients. The thrombi in common femoral vein (CFV), were diagnosed by compression technique and, were qualitatively analysed by echogenicity and consistency. Venography was performed in 18 limbs and histologic tests of thrombi were made in 6 limbs. The total accuracy of US was 100% for diagnosis of DVT, but was 83% for diagnosis of its extent. The total accuracy of US in each segment was greater than 90%, but the sensitivity of iliac veins was less than 90%. The thrombi in CFV were divided into 3 types and 8 sub-types. Type A was homogenous, type B was heterogenous, and type C was contracted echo. The types of us were consistent with results of histologic tests. We concluded that high resolution US is available for screening test for diagnosis of DVT and that qualitative evaluation of thrombi by US is a useful clinical test for selection of more adequate treatments. 相似文献