全文获取类型
收费全文 | 4005篇 |
免费 | 360篇 |
国内免费 | 9篇 |
专业分类
耳鼻咽喉 | 24篇 |
儿科学 | 100篇 |
妇产科学 | 51篇 |
基础医学 | 509篇 |
口腔科学 | 103篇 |
临床医学 | 328篇 |
内科学 | 959篇 |
皮肤病学 | 44篇 |
神经病学 | 507篇 |
特种医学 | 385篇 |
外科学 | 417篇 |
综合类 | 50篇 |
一般理论 | 3篇 |
预防医学 | 357篇 |
眼科学 | 25篇 |
药学 | 199篇 |
中国医学 | 5篇 |
肿瘤学 | 308篇 |
出版年
2022年 | 28篇 |
2021年 | 58篇 |
2020年 | 32篇 |
2019年 | 67篇 |
2018年 | 71篇 |
2017年 | 65篇 |
2016年 | 58篇 |
2015年 | 71篇 |
2014年 | 102篇 |
2013年 | 132篇 |
2012年 | 175篇 |
2011年 | 196篇 |
2010年 | 150篇 |
2009年 | 133篇 |
2008年 | 198篇 |
2007年 | 194篇 |
2006年 | 163篇 |
2005年 | 166篇 |
2004年 | 153篇 |
2003年 | 136篇 |
2002年 | 149篇 |
2001年 | 136篇 |
2000年 | 127篇 |
1999年 | 140篇 |
1998年 | 67篇 |
1997年 | 58篇 |
1996年 | 61篇 |
1995年 | 55篇 |
1994年 | 48篇 |
1993年 | 52篇 |
1992年 | 102篇 |
1991年 | 96篇 |
1990年 | 107篇 |
1989年 | 84篇 |
1988年 | 76篇 |
1987年 | 61篇 |
1986年 | 58篇 |
1985年 | 58篇 |
1984年 | 43篇 |
1983年 | 35篇 |
1982年 | 24篇 |
1981年 | 40篇 |
1980年 | 28篇 |
1979年 | 33篇 |
1978年 | 25篇 |
1975年 | 26篇 |
1974年 | 31篇 |
1973年 | 23篇 |
1972年 | 21篇 |
1971年 | 22篇 |
排序方式: 共有4374条查询结果,搜索用时 15 毫秒
1.
2.
3.
M Yazdanbakhsh C M Eckmann D Roos 《The American journal of tropical medicine and hygiene》1987,37(1):106-110
Eosinophils generate hypochlorous acid when stimulated with opsonized particles. The hypochlorous acid can react with beta-amino acids such as taurine to produce chloramines with a long lifetime. In the presence of bromide, eosinophils generate hypobromous acid which can react with taurine to generate taurine bromamine. As taurine is abundantly present in leukocytes, eosinophils have the potential to generate taurine chloramine or taurine bromamine. With regard to the role of eosinophils in killing schistosomula, we have shown that both taurine chloramine and taurine bromamine in physiological concentrations are able to kill the schistosomula of Schistosoma mansoni. 相似文献
4.
D M Burns J M Forstrom K E Friday G A Howard B A Roos 《Proceedings of the National Academy of Sciences of the United States of America》1989,86(23):9519-9523
The parafollicular-cell (C-cell) hormone calcitonin (CT) can preserve or even augment skeletal mass by inhibiting osteoclast-mediated bone resorption. The possibility of an additional anabolic skeletal influence has also been raised: C cells might, via CT or other secretory products, affect osteoblast-mediated bone formation. The 57-residue amino-terminal procalcitonin cleavage peptide, N-proCT, has recently been identified in human and rat C cells, where it is made and secreted in equimolar amounts with CT. The coelaboration of N-proCT and CT and N-proCT's sequence conservation during evolution prompted us to investigate the potential skeletal bioactivity of N-proCT. We found that synthetic human N-proCT, at nanomolar concentrations, stimulated proliferation of normal and neoplastic human osteoblasts. At maximally effective doses, human N-proCT caused more than a 100% increase above the control rate of DNA synthesis, an effect comparable to the maximal growth effect of insulin, a potent mitogen for osteoblasts. Human N-proCT exerted a similar maximal mitogenic effect in chicken osteoblast cultures but at 1000-fold greater concentrations than in human bone-cell cultures. The bone-cell action of N-proCT was potentiated with insulin with a greater than 200% increase in DNA synthesis at high insulin concentrations. In sharp contrast to these findings for N-proCT, the other bioactive C-cell peptides, CT and somatostatin, showed no mitogenic effects in human or chicken osteoblast cultures. Our results indicate that the action of N-proCT on cultured bone cells is separate from and potentiated by insulin, a known growth factor. Unlike insulin and related growth factors such as insulin-like growth factor I, N-proCT is not mitogenic in skin fibroblast cultures. We propose that N-proCT is a C-cell hormone that promotes bone formation via stimulatory actions on osteoblasts and preosteoblasts. 相似文献
5.
6.
Evaluation of beta-lactamase activity and microbial interference in treatment failures of acute streptococcal tonsillitis 总被引:2,自引:0,他引:2
Out of 169 patients with streptococcal tonsillitis treated with phenoxymethylpenicillin, 13 (8%) developed a new clinical infection with the same streptococcal strain within 2 weeks of completing the therapy (clinical treatment failure) and 24 (14%) were clinically healthy but harboured the same streptococcal strain after treatment (bacterial treatment failure). Patients with clinical treatment failure showed beta-lactamase activity in their saliva pellet significantly more often than patients with bacterial treatment failure, healed streptococcal tonsillitis or non-streptococcal tonsillitis as well as healthy controls. In an interference study, clinical treatment failures were compared with healthy streptococcal carriers, i.e. persons living in the same household and harbouring the same beta-streptococcal strain. 11/12 healthy carriers had alpha-streptococci with interfering activity against their own beta-streptococcal strain, while the corresponding figure for the clinical treatment failures was 2/13. Furthermore, 6/12 healthy carriers had beta-streptococci inhibiting their own alpha-strains, while the streptococci in 11/13 clinical treatment failures had this ability. The beta-lactamase activity and the interference between alpha- and beta-streptococci may be a contributory cause to treatment failure in streptococcal tonsillitis. 相似文献
7.
J B Lanser G Velders A Jennekens-Schinkel R A Roos 《Nederlands tijdschrift voor geneeskunde》1989,133(50):2515-2517
Eight children with the syndrome of Gilles de la Tourette underwent a neuropsychological assessment. The results were compared with those of eight children with proven lesions of the right cerebral hemisphere and with eight children with learning disabilities without neurological disturbances. Our findings do not support organicity or dysfunctions of the right hemisphere in children with Gilles de la Tourette syndrome. 相似文献
8.
We examined whether the macrophages in the liver, Kupffer cells, could be activated to a tumoricidal state in a similar way as has been described for other macrophage types. Kupffer cells were isolated by centrifugal elutriation of pronase-treated rat livers. Incubation with highly purified recombinant rat gamma-interferon in combination with small amounts of lipopolysaccharide or muramyldipeptide resulted in highly cytotoxic macrophages, as measured against P815 tumor cells in an 18 h 51Cr-release assay. Incubation of Kupffer cells with the stimulators entrapped within liposomes, caused phagocytosis of the liposomes and subsequent activation to tumor cytotoxicity, provided that both rat gamma-interferon and subthreshold doses of either lipopolysaccharide or muramyldipeptide were encapsulated. The minimum amount of liposomal rat gamma-interferon that induced optimal activation was 0.5 U/ml, while 6 ng/ml of liposomal lipopolysaccharide or muramyldipeptide was required. Cytotoxicity of Kupffer cells activated in this way, persisted for at least 48 h. Since liposomes in circulation are readily cleared by the liver macrophages, these findings may have therapeutic implications. 相似文献
9.
W A Hoefnagels G J Vielvoye F A de Jonge W E Peetermans J H Wondergem R A Roos 《Clinical neurology and neurosurgery》1991,93(2):149-150
A 21-year-old woman is reported with aplastic anaemia, who presented with pain in the leg. Rapid loss of sciatic nerve function followed. MRI showed irregular streaks of low intensity in the muscles of the pelvic region. A diagnosis of sciatic neuritis as initial symptom of clostridial myonecrosis was made. 相似文献
10.
A de Roos J Doornbos S Rebergen P van Rugge P Pattynama E E van der Wall 《European journal of radiology》1992,14(2):97-103
Recent advances in cardiovascular applications of magnetic resonance (MR) imaging and phosphorus-31 spectroscopy are reported. MR velocity mapping is a valuable adjunct to conventional imaging techniques, providing information on flow velocities as well as on absolute blood flow volume in the aorta and pulmonary arteries. Recently, ultrafast MR techniques have become available to evaluate myocardial perfusion with the aid of MR contrast agents as perfusion marker. Dynamic MR imaging is a powerful tool to assess cardiac function and ventricular mass. In particular, right ventricular function and mass can be evaluated with great accuracy, contributing to improved assessment of the significance of disease processes which may affect the right heart. The role of phosphorus-31 spectroscopy of the heart is expanding for the evaluation of ischemic myocardial disease and cardiomyopathies. The phosphocreatine to adenosine triphosphate ratio appears to be a marker of disease in patients with cardiac hypertrophy. In conclusion, MR imaging and phosphorus-31 spectroscopy is gaining widespread acceptance for evaluation of many cardiovascular disease processes. 相似文献