全文获取类型
收费全文 | 29580篇 |
免费 | 3469篇 |
国内免费 | 1982篇 |
专业分类
耳鼻咽喉 | 255篇 |
儿科学 | 348篇 |
妇产科学 | 250篇 |
基础医学 | 2712篇 |
口腔科学 | 622篇 |
临床医学 | 3992篇 |
内科学 | 3369篇 |
皮肤病学 | 359篇 |
神经病学 | 1210篇 |
特种医学 | 1137篇 |
外国民族医学 | 13篇 |
外科学 | 2742篇 |
综合类 | 6035篇 |
现状与发展 | 10篇 |
一般理论 | 3篇 |
预防医学 | 2661篇 |
眼科学 | 757篇 |
药学 | 3676篇 |
37篇 | |
中国医学 | 2882篇 |
肿瘤学 | 1961篇 |
出版年
2024年 | 230篇 |
2023年 | 721篇 |
2022年 | 1744篇 |
2021年 | 2156篇 |
2020年 | 1663篇 |
2019年 | 1151篇 |
2018年 | 1165篇 |
2017年 | 1182篇 |
2016年 | 1008篇 |
2015年 | 1502篇 |
2014年 | 1757篇 |
2013年 | 1720篇 |
2012年 | 2473篇 |
2011年 | 2481篇 |
2010年 | 1751篇 |
2009年 | 1374篇 |
2008年 | 1564篇 |
2007年 | 1538篇 |
2006年 | 1390篇 |
2005年 | 1137篇 |
2004年 | 823篇 |
2003年 | 958篇 |
2002年 | 745篇 |
2001年 | 627篇 |
2000年 | 442篇 |
1999年 | 370篇 |
1998年 | 207篇 |
1997年 | 187篇 |
1996年 | 138篇 |
1995年 | 116篇 |
1994年 | 99篇 |
1993年 | 69篇 |
1992年 | 100篇 |
1991年 | 65篇 |
1990年 | 84篇 |
1989年 | 49篇 |
1988年 | 53篇 |
1987年 | 44篇 |
1986年 | 34篇 |
1985年 | 23篇 |
1984年 | 19篇 |
1983年 | 12篇 |
1982年 | 6篇 |
1981年 | 5篇 |
1979年 | 16篇 |
1978年 | 6篇 |
1977年 | 4篇 |
1976年 | 3篇 |
1974年 | 5篇 |
1966年 | 4篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
神经肽Y(NPY)是广泛分布于中枢神经系统和外周神经各部位的神经肽类物质。本实验观察NPY在体外对几种免疫细胞活性的直接作用。结果表明,NPY对小鼠T淋巴细胞丝裂原反应性和NK细胞的杀伤活性均无明显影响(P>0.05),对巨噬细胞分泌溶菌酶有明显抑制作用(P<0.05);而对B淋巴细胞丝裂原反应性则有明显的促进作用(P<0.05)。上述结果提示,NPY对部分免疫细胞功能的影响因细胞种类而异。 相似文献
5.
6.
基于临床流程功能需求的生理监测仪配置评估 总被引:1,自引:0,他引:1
病人生理监测仪是临床医学的主要仪器之一,由于所涉及的技术流程定位不同,功能需求也就不同,其功能配置也应有所不同。本文从分解分析生理监测仪相关应用领域的技术定位功能需求出发,讨论卫生技术装备管理的功能配置评估。 相似文献
7.
岳培荣 《河南中医学院学报》2006,21(2):50-51
感染性发热病是细菌或病毒等病原微生物侵入人体而引起的急性热病,在临床上一般包括细菌性感染和病毒性感染.临证以发热恶寒、口苦头晕、胸腕痞闷、恶心纳呆、大便不畅或便秘、舌苔黄厚而腻、脉弦滑为主证,属湿热病邪侵入人体所引起的湿温病范畴.我院中医门诊自2000年以来,采用中医药辨证治疗湿热郁遏型感染性疾病获得了较好的疗效,现将资料完整的126例分析如下. 相似文献
8.
Wen Zhao Jian Sun Jia-Wei Zheng Jun Li Yue He Zhi-Yuan Zhang 《Otolaryngology--head and neck surgery》2006,135(5):758-764
OBJECTIVE: To study the effect of the cervical plexus and the accessory nerve to the function of the trapezius muscle. STUDY DESIGN AND SETTING: Eighteen adult male Sprague-Dawley rats were randomly divided into three groups. The neurotomies were performed in the left sides and the right sides served as within-subject controls. In group A, the accessory nerve was transected. The C2-5 were transected in group B, and both of the accessory nerve and C2-5 were cut in group C. The electrophysiologic, myophysiologic, and histologic changes of the muscles were measured. RESULTS: There were significant differences (P < 0.05) between the three groups in the recovery rates of the transverse area of the muscles. The CMAP recorded from the experimental sides in group B were similar to the control sides. The values of the maximum tension of the tetanus contraction between the two sides showed no differences either (P > 0.05). CONCLUSION: The accessory nerve supplies the most important motor input to the trapezius. Motor innervations of the cervical plexus are not very significant. 相似文献
9.
角膜溃疡穿孔的修复与修复材料的选择 总被引:2,自引:0,他引:2
总结21例用不同材料修复角膜穿孔的病例,修复材料分别为结膜瓣、硅胶板、断层自体皮片和同种异体角膜。结膜瓣遮盖仅2/3保存眼球,愈合后视力差,并发症多;硅胶板可在穿孔大、情况紧急时作暂时封孔保存眼球之用;自体断层皮片术后不久即溶解,角膜移植者7眼中6眼保存了眼球,且有5例植片透明,视力0.1以上。 相似文献
10.
BACKGROUND: Under the normal circumstance, there exist some synapses with inactive functions in central nervous system (CNS), but these functions are activated following nerve injury. At the early stage of brain injury, the abnormal functions of brain are varied, and they have very strong plasticity and are corrected easily.
OBJECTIVE: To observe the changes of neuronal morphology in hippocampal CA1 region and memory function in newborn rats with hypoxic-ischemic encephalopathy(HIE) from ischemia 6 hours to adult.
DESIGN: Completely randomized grouping, controlled experiment.
SETTING: Taian Health Center for Women and Children; Taishan Medical College.
MATERIALS: Altogether 120 seven-day-old Wistar rats, of clean grade, were provided by the Experimental Animal Center, Shandong University of Traditional Chinese Medicine. Synaptophysin (SYN) polyclonal antibody was provided by Maixin Biological Company, Fuzhou.
METHODS: This experiment was carried out in the Laboratory of Morphology, Taishan Medical College between October 2000 and December 2003. ① The newborn rats were randomly divided into 2 groups: model group and control group, 60 rats in each group. Five rats were chosen from each group at postoperative 6 hours, 24 hours, 72 hours, 7 days, 2 weeks and 3 weeks separately for immunohistochemical staining. Fifteen newborn rats were chosen from each group at postoperative 4 weeks and 2 months separately for testing memory ability (After test, 5 rats from each group were sacrificed and used for immunohistochemical staining)② The right common carotid artery of newborn rats of model group was ligated under the anesthetized status. After two hours of incubation, the rats were placed for 2 hours in a container filled with nitrogen oxygen atmosphere containing 0.08 volume fraction of oxygen, thus, HIE models were created; As for the newborn rats in the control group, only blood vessels were isolated, and they were not ligated and hypoxia-treated. ③ Thalamencephal tissue sections of newborn rats of two groups were performed DAB developing and haematoxylin slight staining. Cells with normal nucleous in 250 μm-long granular layer which started from hippocampal CA1 region were counted with image analysis system under high-fold optical microscope (×600), and the thickness of granular layer was measured. The absorbance (A) of positive reactant of SYN in immunohistochemically-stained CA1 region was measured. Learning and memory ability were measured with step through test 3 times successively. ④ t test and paired t test were used for comparing intergroup and intragroup difference of measurement data respectively, and Chi-square for comparing the difference of enumeration data.
MAIN OUTCOME MEASURES: Comparison of cytological changes in hippocampal CA1 region and memory ability at different postoperative time points between two groups.
RESULTS: Totally 120 newborn rats were involved in the result analysis. ① Cell morphological changes in hippocampal CA1 region: In the control group, with aging, perikaryon, nucleus and nucleolus in cortex of parietal lobe were significantly increased, Nissl body was compacted, the amount of neurons was declined, but the A of SYN positive reactant was relatively increased. In the model group, at postoperative each time point, neurons were seriously shrunk and dark-stained, nucleus was contracted, chromatin was condensed, nucleolus was unclear, even cells disappeared, especially the cells in 6 hours and 24 hours groups. The amount of neurons with normal morphology in hippocampal CA1 region and granular layer thickness in the model group at postoperative each time point were significantly less or smaller than those in the control group at postoperative 6 hours respectively (t =3.002-1.254, P < 0.01). The A value of SYN positive reactant at postoperative 2, 3 and 4 weeks was significantly higher than that at previous time point (t =2.011-2.716,P < 0.05-0.01). ② Test results of learning and memory ability: In the first test, there was no significant difference in the ratio of rats which kept memory ability between two groups (P > 0.05); In the third test, the ratio of rats which kept memory ability in the model group was significantly lower than that in the control group at postoperative 4 weeks and 2 months[53%(8/15),100%(15/15);60%(9/15),93%(14/15),χ 2=2.863,2.901,P < 0.01].
CONCLUSION: The destroyed hippocampal structure induces the decrease of learning and memory ability of developmental rats. Early interference can increase the quality of neurons and also promote functional development of the nervous system. 相似文献