全文获取类型
收费全文 | 152338篇 |
免费 | 15182篇 |
国内免费 | 10730篇 |
专业分类
耳鼻咽喉 | 1126篇 |
儿科学 | 2043篇 |
妇产科学 | 1479篇 |
基础医学 | 14165篇 |
口腔科学 | 2955篇 |
临床医学 | 20759篇 |
内科学 | 18382篇 |
皮肤病学 | 1804篇 |
神经病学 | 5477篇 |
特种医学 | 5294篇 |
外国民族医学 | 45篇 |
外科学 | 12285篇 |
综合类 | 33990篇 |
现状与发展 | 42篇 |
一般理论 | 9篇 |
预防医学 | 14416篇 |
眼科学 | 3958篇 |
药学 | 17768篇 |
246篇 | |
中国医学 | 11993篇 |
肿瘤学 | 10014篇 |
出版年
2024年 | 602篇 |
2023年 | 2265篇 |
2022年 | 5695篇 |
2021年 | 7169篇 |
2020年 | 5968篇 |
2019年 | 4443篇 |
2018年 | 4527篇 |
2017年 | 5041篇 |
2016年 | 4258篇 |
2015年 | 6971篇 |
2014年 | 8666篇 |
2013年 | 8922篇 |
2012年 | 13185篇 |
2011年 | 13851篇 |
2010年 | 10761篇 |
2009年 | 8980篇 |
2008年 | 9829篇 |
2007年 | 9633篇 |
2006年 | 8574篇 |
2005年 | 7499篇 |
2004年 | 5602篇 |
2003年 | 5560篇 |
2002年 | 4720篇 |
2001年 | 3750篇 |
2000年 | 2809篇 |
1999年 | 1979篇 |
1998年 | 1120篇 |
1997年 | 1158篇 |
1996年 | 851篇 |
1995年 | 724篇 |
1994年 | 678篇 |
1993年 | 383篇 |
1992年 | 372篇 |
1991年 | 349篇 |
1990年 | 316篇 |
1989年 | 228篇 |
1988年 | 221篇 |
1987年 | 194篇 |
1986年 | 135篇 |
1985年 | 95篇 |
1984年 | 49篇 |
1983年 | 46篇 |
1982年 | 18篇 |
1981年 | 12篇 |
1980年 | 8篇 |
1979年 | 15篇 |
1978年 | 2篇 |
1975年 | 4篇 |
1974年 | 3篇 |
1973年 | 5篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
准分子激光角膜切削术治疗近视的并发症 总被引:3,自引:0,他引:3
为分析准分子激光角膜切削术(PRK)治疗近视的并发症,对139例(257眼)PRK术后随访半年至一年。结果表明:术后一年,低中度和高度组各有1眼最佳矫正视力丢失二行,分别占2.5%和3.3%;低中度和高度组的角膜上皮下1级混浊分别为10.81%和15.16%,2级混浊分别为2.73%和0%;激素性高眼压,在发生率最高的3个月时,可分别达24.37%和25.32%,但这种反应性的眼压升高只是暂时的,容易控制;过矫和散光增加的发生率均较低,主要与术者的经验有关。随着术者经验的提高、手术设计的完善及术后用药的研究,这些并发症会降到最低水平。PRK是安全、有效的。 相似文献
102.
NADPH-Diaphorase-Positive Neurons in Primate Cerebral Cortex Colocalize with GABA and Calcium-Binding Proteins 总被引:3,自引:3,他引:0
Neurons in the monkey cerebral cortex containing nicotinamideadenine dinucleotide phosphate-diaphorase (NADPH-d) can he dividedinto two distinct types, both nonpyramidal. Type I neurons havea large soma (diameter 2050 µm), a dense NADPH-dhistochemical reaction. and are distributed throughout the cortex,but mainly in the subcortical white matter, and are mostly aspiny.Type II cells have a small soma (< 20 µm) with lightNADPH-d reactivity and are distributed primarily in the supragranularlayers, particularly layers II and upper III. The numericaldensity of type II cells is much greater than that of type I.Type I neurons also stain for GABA and a few intracortical typeI cells contain calbindin. All type II cells found here arecolocalized with both GABA and calbindin. Neither type I nortype II cells are stained for parvalbumin. Together with previous observations that almost all corticalNADPH-d cells in various subprimates are like type I cells,we suggest that type II cells may form a group of NADPH-d-richneurons differentiated in higher mammalian cortex from a subpopulationof calbindin-containing GABAergic interneurons, and these nitricoxide-synthesizing cells may play a role in control of intracorticalneuronal activity characteristic of higher cerebral functionsin advanced mammals. 相似文献
103.
104.
预移植在胚胎移植中的意义 总被引:2,自引:0,他引:2
目的 :评价预移植在胚胎移植中的作用。 方法 :在超声波引导下胚胎移植 114个周期 ,其中 10 1个周期进行预移植。比较预移植与未预移植周期临床妊娠率和胚胎种植率 ;按预移植与实际胚胎放置深度差值分组 ,并比较两组妊娠率和胚胎种植率。 结果 :预移植周期与未预移植周期临床妊娠率和种植率统计学差异无显著性(5 9.4 1%和 6 1.5 4 % ,35 .81%和 31.4 3% ,P均 >0 .0 5 ) ;按预移植与实际胚胎放置深度差值分组后 ,两组妊娠率和种植率统计学差异也无显著性 (6 1.5 4 %和 5 8.6 7% ,4 0 .79%和 34.0 9% ,P均 >0 .0 5 )。 结论 :在胚胎移植技术中 ,预移植不能准确指引胚胎移植深度 相似文献
105.
Zheng Qi-xin Zhu Tong-bai Du Jing-yuan Hong Guang-xiang Li Shi-pu Yan Yun-hua Zhang En-dang 《华中科技大学学报(医学英德文版)》1992,12(3):173-178
Summary The authors have prepared the artificial bone of porous tricalcium phosphate ceramics according to an appropriate formula
and manufacturing technology. Physical and chemical testing shows that it possesses several distinguishing features: the communicating
pores and macro/micropores; mean pore size, 380 μm (from 240 μm to 510 μm); porosity, 46.4 %; and compressive strength, 97.4
kg/cm2. It consists of CaO (49.09 %) and P2O5 (48.84 %). The testing of its biocompatibility shows that it is devoid of systemic or local toxicity, and free of irritation
or foreign body response in tissues, and it does not result in hemolysis or mutation. The new bone readily grows into its
pores with direct contact to the implanted material. 11 cases of bone defects were treated with this artificial bone with
satisfactory results. 相似文献
106.
107.
五型病毒性肝炎的暴露因素与临床表现的比较 总被引:2,自引:1,他引:1
比较急性病毒性肝炎患者感染打危险因素,同时比较五型肝炎的症状和体征。连续收集急性病毒性肝炎患者血清293份,用ELISA法检测了五型肝炎病毒的病原学指标,并进行了流赞美同学调查。暴露因素:丙肝的肠道外暴露外明显多于甲肝;甲肝和戊肝有较高的“甲肝”患者接触史;乙肝,丙肝和丁肝有高的“乙肝”接触史,与甲肝,戊肝相比差异显著。 相似文献
108.
The subdivisions of the sacral intermediolateral nucleus (IML) of the cat have been studied by using a double-labeling technique of retrograde Fluoro-gold (FG) and wheat germ agglutinin-conjugated horseradish peroxidase (WGA-HRP) tracing. The parasympathetic preganglionic neurons (PGNs) that were labeled by the FG injected into the pelvic nerve formed a ‘V’-shaped column known as the sacral parasympathetic nucleus (SPN) in the sacral IML. The neurons that were labeled by the WGA-HRP applied to the lateral parabrachial nucleus (PBL) formed an elongated spindle-shaped column extending throughout the IML of the sacral segments. We designated it by the name of sacral visceral sensory nucleus (SVSN). These findings indicate that the sacral IML of the cat contain two distinct subdivisions, SPN and SVSN. 相似文献
109.
利用特异性DNA倍增技术(polymerase chain Reaction,PCR)检测t-PA cDNA基因在表达细胞基因组中的稳定性,并对所得的PCR反应产物进行了限制性内切酶片段、分子杂交和核苷酸顺序分析等方面的研究,证实了t-PA cDNA基因已插入到表达细胞染色体中。这种方法快速、简便、灵敏度和特异性高,是检测基因工程表达细胞中cDNA基因稳定整合状况的好方法。 相似文献
110.
Circulating antisperm antibodies (AsAb) and immunosuppressive material in seminal plasma (SPIM)were determined by solid-phase enzyme staining assay and anticomplement test respectively in 686 patients with abortion (including 285 couples) . 241 fertile couple served as control. It's found that the positive rate of AsAb in infertile patients was significantly higher than that in fertile control,being 36.6% vs 3.3% (P<0.001). AsAb was even more offen detected in recurrent aborting patients. Male patients whose spouses aborted 2-6 fetuses had significantly less SPIM than control, sperm count and sperm motility were also significantly decreased. But the incidence of pyospermia was significantly greater than that in control. It is concluded that AsAb and SPIM have played an important role in the development of recurrent abortions. 相似文献