全文获取类型
收费全文 | 64981篇 |
免费 | 5709篇 |
国内免费 | 3526篇 |
专业分类
耳鼻咽喉 | 686篇 |
儿科学 | 954篇 |
妇产科学 | 874篇 |
基础医学 | 8697篇 |
口腔科学 | 1497篇 |
临床医学 | 7420篇 |
内科学 | 10648篇 |
皮肤病学 | 935篇 |
神经病学 | 4629篇 |
特种医学 | 2399篇 |
外国民族医学 | 26篇 |
外科学 | 7270篇 |
综合类 | 8763篇 |
现状与发展 | 11篇 |
一般理论 | 8篇 |
预防医学 | 3970篇 |
眼科学 | 1763篇 |
药学 | 6331篇 |
26篇 | |
中国医学 | 2257篇 |
肿瘤学 | 5052篇 |
出版年
2024年 | 131篇 |
2023年 | 779篇 |
2022年 | 1812篇 |
2021年 | 2244篇 |
2020年 | 1657篇 |
2019年 | 1581篇 |
2018年 | 1885篇 |
2017年 | 1698篇 |
2016年 | 1532篇 |
2015年 | 2171篇 |
2014年 | 2699篇 |
2013年 | 2672篇 |
2012年 | 3970篇 |
2011年 | 4054篇 |
2010年 | 2464篇 |
2009年 | 2020篇 |
2008年 | 2761篇 |
2007年 | 2956篇 |
2006年 | 2860篇 |
2005年 | 2691篇 |
2004年 | 1952篇 |
2003年 | 1833篇 |
2002年 | 1577篇 |
2001年 | 3045篇 |
2000年 | 2963篇 |
1999年 | 2720篇 |
1998年 | 1259篇 |
1997年 | 1108篇 |
1996年 | 810篇 |
1995年 | 691篇 |
1994年 | 593篇 |
1993年 | 427篇 |
1992年 | 1253篇 |
1991年 | 1118篇 |
1990年 | 982篇 |
1989年 | 1043篇 |
1988年 | 953篇 |
1987年 | 856篇 |
1986年 | 781篇 |
1985年 | 671篇 |
1984年 | 411篇 |
1983年 | 334篇 |
1982年 | 200篇 |
1981年 | 152篇 |
1980年 | 125篇 |
1979年 | 209篇 |
1973年 | 93篇 |
1972年 | 92篇 |
1971年 | 94篇 |
1968年 | 84篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
31.
32.
Zhang Gu-sheng章谷生 Hu Fang-yuan胡方远 Ye Qing-zhen叶庆祯 Yan Yong-tang严咏棠Immunology Laboratory Shanghai Institute of Biologicat Products Shanghai 《中华医学杂志(英文版)》1986,99(4):343-346
Neurotropin (NSP) is an extract isolated from
the skin of rabbits inoculated with vaccinia virus.
The present study examines the possible action of
NSP on the number and function of immunocompe
tent cells in mice. The experiment showed that NSP
had no effect on both T and B lymphocytes of nor-
malimmunized mouse spleen. The degree of plaque
forming cell reaction and titre of specific antibody
showed no significant differences when the NSP
treated group and controls were compared. How-
ever, NSP exhibited promotive effect on specific
antigen binding cells in the early stage of immune
responses. It was also noted that the rosette forming
capacity of human T lymphocytes in vitro was restor-
ed markedly by NSP. These results suggest that
NSP possesses certain immunostimulating activity,
particularly on the specific antigen binding cells and
human T lymphocytes. 相似文献
33.
34.
目的 回顾性分析1126例住院心脏病病人的病因,为今后防治工作提供初步依据.方法 收集2000年1月~2004年12月住我科的心脏病病人的病历资料,用回顾性方法进行统计分析.结果 1126例心脏病病人的病因分别是高心病(34.2%)、冠心病(18.0%)、肺心病(13.7%)、联合性心脏病(11.9%)、扩心病(7.8%)、风心病(5.8%)、退行性心脏瓣膜病(3.9%)、急性病毒性心肌炎(2.8%),先心病(1.9%).结论 今后防治工作重点在于实施有效的高血压病和冠心病的防治,还要重视慢性肺心病和风心病的防治. 相似文献
35.
Pathways from first health care seeking to diagnosis: obstacles to tuberculosis care in rural China.
W B Wang Q W Jiang Y Chen B Xu 《The international journal of tuberculosis and lung disease》2007,11(4):386-391
OBJECTIVE: To examine health care seeking pathways for patients with tuberculosis (TB) and barriers related to these pathways in counties under the National TB Control Programme in rural China. METHODS: A cross-sectional study was conducted in two counties of east China in 2004-2005. A total of 557 TB patients were recruited and interviewed by physicians at the time of TB diagnosis. RESULTS: Of 557 participants, 13.3% had presented to a specialised county TB dispensary (CTD) directly after onset of symptoms, 31.4% had first sought care at a village health station and 51.2% had visited a township or county hospital first. The proportion of referral by a first health care provider to a CTD was highest in county level hospitals (73.5%) and lowest in village health stations (21.7%). The most prompt pathway from first health care seeking to TB diagnosis was to visit a CTD directly, with a median provider's delay of only one day. There was an increase in provider's delay when more health facilities were involved. CONCLUSION: To improve direct referral from general health care providers, especially village health care workers, to TB specialists would significantly shorten the delays in TB diagnosis in rural China. 相似文献
36.
以曼氏血吸虫的虫卵和成虫免疫家兔后所产生的特异性抗体,可用以日本血吸虫虫卵、尾蚴和成虫为抗原分别进行的COP,CHR和ELACIEP测出,表明两种人体血吸虫存有显著的交叉抗原成分。应用此种血清交叉反应性,以检测抗异种人体血吸虫的抗体,似有效而可取的,可用以辅助诊断援外回国人员是否感染国外人体血吸虫病。 相似文献
37.
Previous studies using the technique of microinjection into brain nuclei indicated that the periaqueductal gray (PAG), nucleus accumbens, habenula and amygdala play an essential role in pain modulation and that these nuclei possibly act through a ‘mesolimbic neural loop‘ to exert an analgesic effect, in which Met-enkephalin (MEK) and β-endorphin (β-EP) have been implicated as the two major opioid peptides involved in antinociception. In the present study performed in rabbits, intracranial microinjection was supplemented with push-pull perfusion and radioimmunoassay to determine whether the release of enkephalins (ENK) and β-EP was increased in these nuclei when the putative neural circuit was activated by morphine administered into one of the nuclei. The results showed: (1) microinjection of morphine into the PAG increased the release of ENK and β-EP in the N. accumbens, and vice versa; (2) microinjection of morphine into the N. accumbens increased the release of ENK and β-EP in the amygdala, and vice versa; (3) morphine microinjected into the PAG caused an increase in the release of ENK and β-EP in the amygdala and vice versa, although the release of ENK in PAG was statistically not significant. These results indicate that PAG, N. accumbens and amygdala are connected in a network served by a positive feedback circuitry. 相似文献
38.
This paper is a summary of our observations on 105 cases of infantile spasms. The age of onset was around six months after birth, but the patients came for treatment mainly about one year after onset. Fever of unknown cause, asphyxia, birth injury, infection of the central nervous system, tuberous sclerosis, phenylketonuria and recent immunization etc. were complained. Clinically, it is characterized by head nodding, mental retardation, myoclonic jerks and various neurologic deficits. EEG findings showed classical or modified arrythmia or other epileptiform patterns. About one third of 22 cases examined had abnormal brain stem auditory evoked potentials. Among 42 patients who underwent CT scanning before ACTH treatment, 18 were normal and 7 abnormal; during ACTH treatment 3 normal and 4 abnormal; after completion of treatment, 4 normal and 6 abnormal, suggesting no further atrophy of the brain. Examination of trace elements of the hair by particle-induced X-ray emission (PIXE) method in 23 patients revealed a significant difference in lead, calcium and zinc contents between patients and 101 controls, but no statistical difference in iron and copper contents between the two groups. Sodium valproate, prednisone and ACTH appear to be effective in the treatment of infantile spasms. Eight patients fully recovered, and they can go to school without difficulty. Many patients derived various degrees of improvement to the satisfaction of their parents. Two patients were still amented and often attacked by myoclonus. The effects, side effects of these drugs, and the possible pathogenesis were discussed.
相似文献
39.
白术、枳实、玫瑰花挥发油-β-环糊精包合物的制备工艺研究 总被引:3,自引:0,他引:3
目的确定白术、枳实、玫瑰花挥发油-β-环糊精包合物的最佳包合工艺。方法采用正交试验法,对挥发油与β-环糊精的包合进行3因素3水平考察。结果挥发油与β-CD投料比为1:9,β-CD与加水量的比为9:100倍,包合时间为4h,包合率为85.3%。结论用此法得到的挥发油-β-环糊精包合物的包合率较高,包合物性质稳定,而且包合操作简单。 相似文献
40.