全文获取类型
收费全文 | 5893篇 |
免费 | 547篇 |
国内免费 | 444篇 |
专业分类
耳鼻咽喉 | 40篇 |
儿科学 | 81篇 |
妇产科学 | 44篇 |
基础医学 | 764篇 |
口腔科学 | 106篇 |
临床医学 | 790篇 |
内科学 | 944篇 |
皮肤病学 | 68篇 |
神经病学 | 264篇 |
特种医学 | 446篇 |
外科学 | 435篇 |
综合类 | 953篇 |
现状与发展 | 2篇 |
一般理论 | 2篇 |
预防医学 | 382篇 |
眼科学 | 208篇 |
药学 | 665篇 |
5篇 | |
中国医学 | 252篇 |
肿瘤学 | 433篇 |
出版年
2024年 | 17篇 |
2023年 | 89篇 |
2022年 | 266篇 |
2021年 | 316篇 |
2020年 | 231篇 |
2019年 | 161篇 |
2018年 | 201篇 |
2017年 | 192篇 |
2016年 | 165篇 |
2015年 | 256篇 |
2014年 | 335篇 |
2013年 | 299篇 |
2012年 | 392篇 |
2011年 | 459篇 |
2010年 | 273篇 |
2009年 | 227篇 |
2008年 | 281篇 |
2007年 | 259篇 |
2006年 | 258篇 |
2005年 | 276篇 |
2004年 | 155篇 |
2003年 | 170篇 |
2002年 | 133篇 |
2001年 | 125篇 |
2000年 | 116篇 |
1999年 | 135篇 |
1998年 | 118篇 |
1997年 | 97篇 |
1996年 | 111篇 |
1995年 | 103篇 |
1994年 | 66篇 |
1993年 | 69篇 |
1992年 | 36篇 |
1991年 | 45篇 |
1990年 | 41篇 |
1989年 | 73篇 |
1988年 | 50篇 |
1987年 | 45篇 |
1986年 | 38篇 |
1985年 | 35篇 |
1984年 | 19篇 |
1983年 | 14篇 |
1982年 | 19篇 |
1981年 | 20篇 |
1980年 | 23篇 |
1979年 | 14篇 |
1978年 | 9篇 |
1977年 | 16篇 |
1976年 | 11篇 |
1975年 | 11篇 |
排序方式: 共有6884条查询结果,搜索用时 0 毫秒
1.
白纹伊蚊在竹林里孳生的阳性比为75.4%;而在竹林包围的居民区阳性比为15.3%。白纹伊蚊在居民区孳生密度布雷图指数为19.4,容器指数为6.2%。居民区孳生蚊虫的主要场所是泡菜坛,泡菜坛主要孳生蚊种是骚扰阿蚊,阳性比为73.7%,其次是淡色库蚊为20.2%,贪食库蚊为14.0%,白纹伊蚊最低,为9.1%。 相似文献
2.
Yulu Miao Mingxia Zhang Yulin Nie Wan Zhao Bin Huang Zhengming Jiang Shaoxiong Yu Zhibin Huang Hongjin Fu 《中国神经再生研究》2007,2(2):126-128
BACKGROUND: Besides local changes of cranial parenchymal cells, hemorrhage, etc., severe traumatic brain injuries also cause the changes of total body fluid and various functions, and the changes of lymphocytes and T lymphocyte subsets should be paid more attention to. OBJECTIVE: To reveal the changing laws of T lymphocyte subsets after severe traumatic brain injury, and compare with mild to moderate brain injury. DESIGN: A comparative observation. SETTINGS: Department of Neurosurgery, Longgang District Buji People's Hospital of Shenzhen City; Central Laboratory of Shenzhen Hospital of Prevention and Cure for Chronic Disease. PARTICIPANTS: All the subjects were selected from the Department of Neurosurgery, Longgang District Buji People's Hospital of Shenzhen City from August 2002 to August 2005. Thirty patients with severe brain injury, whose Glasgow coma score (GCS) was ≤ 8 points, were taken as the experimental group, including 21 males and 9 females, aging 16 - 62 years. Meanwhile, 30 patients with mild traumatic brain injury were taken as the control group (GCS ranged 14- 15 points), including 18 males and 12 females, aging 15 -58 years. All the subjects were in admission at 6 hours after injury, without disease of major organs before injury Informed consents were obtained from all the patients or their relatives. METHODS: (1) The T lymphocytes and the subsets in peripheral blood were detected with immunofluorescent tricolor flow cytometry at l, 3, 7 and 14 days after injury in both groups. (2) The conditions of pulmonary infections were observed at 4 days after injury. The differences of measurement data were compared with the t test. MAIN OUTCOME MEASURES: Changes of T lymphocytes subsets at 1 - 14 days after severe and mild or moderate traumatic injury. RESULTS: Finally, 28 and 25 patients with mild to moderate traumatic brain injury, whereas 25 and 21 patients with severe traumatic brain injury were analyzed at 7 and 14 days respectively, and the missed ones died due to the development of disease. (1) Changes of T lymphocyte subsets: At 1 and 3 days after injury, CD3, CD4, CD8, CD4/CD8 began to decrease, whereas CD8 increased in the experimental group, which were very significantly different from those in the control group (t =2.77 - 3.26, P 〈 0.01), and began to recover at 7 days, which were significantly different from those in the control group (t = 2.06 - 2.24, P 〈 0.05), and generally recovered to the normal levels at 14 days (P 〉 0.05). (2) Conditions of pulmonary infections: At 4 days after injury, the rate of pulmonary infection was significantly different between the experimental group and control group [73% (22/30), 0, x2=37.29, P 〈 0.01]. CONCLUSION: Patients with severe traumatic brain injury suffer from damages of cellular immune function at early period (within 7 days), and they are easily to be accompanied by pulmonary infections. 相似文献
3.
目的:探讨重症胆管(ACST)患者的临床特点及死亡原因。方法:分析我院近十五年来收治46例ACST的治疗情况。结果:手术41例.非手术5例,死亡9例,其中手术治疗死亡6例。结论:老年ACST患者,伴发病多,死亡率高,及时就诊,早期应用大量激素,选择适宜手术方法是降低死亡率的关键。 相似文献
4.
Hideki Amano Kuniyoshi Ohara Masaki Nie Yutaka Miyoshi Hirokuni Yoshimura 《Annals of thoracic and cardiovascular surgery》2002,8(6):389-392
We experienced two cases of left ventricular free wall rupture (LVFWR) following acute myocardial infarction (AMI). Case 1, with the blowout type of LVFWR was initially closed by direct suture, followed by hemostasis using a double patch sealing method (DPS) by which the tear was doubly sealed with large and small bovine pericardium patches to which GRF glue was applied. Case 2 with the oozing type of LVFWR was treated only using DPS. Complete hemostasis was achieved in both cases, and aneurysmal dilatation or constrictive heart failure were not detected by postoperative left ventriculography. Therefore, DPS may be useful for treating LVFWR following AMI. 相似文献
5.
Rupture of the distal biceps tendon: evaluation with MR imaging 总被引:2,自引:0,他引:2
6.
7.
报告335例退行性骨关节病变,均经 x 线摄影证实,用直流感应电治疗。痊愈62例,占18.51%;显效115例,占34.33%;好转139例,占41.49%;无效19例;占5.67%。总有效率94.33%。有复发者再经治疗仍可收到效果。并对作用机制进行了探讨。 相似文献
8.
9.
10.
大狼毒三萜类化学成分的研究 总被引:3,自引:0,他引:3
自大戟科(Euphorbiaceae)植物大狼毒(Euphorbia nematocypha Hand—Mazz)根的乙醇提取物的苯溶解部分,经20%AgNO3硅胶层析,分离得到七个三萜类成分。根据光谱(IR,EIMS,1H—NMR和13C—NMR)和化学方法,确定其中一个化合物为新化合物,命名为大狼毒醇(nematocyphol,Ⅳa),其它化合物为已知物:印度荆芥醇乙酸酯(nepehinol acetate Ⅰ),日尔曼醇乙酸酯(germanicol acetate Ⅱ),大戟醇(euphol,Ⅲ),蒲公英醇(taraxasterol,Ⅴa),24-亚甲基环阿尔廷醇(24-methylenecycloartanol,Ⅴa)和印度荆芥醇(nepehinol,Ⅶa)。这些化合物均为首次从大狼毒中得到。 相似文献