全文获取类型
收费全文 | 755篇 |
免费 | 38篇 |
国内免费 | 3篇 |
专业分类
耳鼻咽喉 | 4篇 |
儿科学 | 12篇 |
妇产科学 | 2篇 |
基础医学 | 99篇 |
口腔科学 | 6篇 |
临床医学 | 66篇 |
内科学 | 227篇 |
皮肤病学 | 66篇 |
神经病学 | 55篇 |
特种医学 | 29篇 |
外科学 | 59篇 |
综合类 | 3篇 |
预防医学 | 37篇 |
眼科学 | 15篇 |
药学 | 74篇 |
中国医学 | 1篇 |
肿瘤学 | 41篇 |
出版年
2023年 | 4篇 |
2022年 | 7篇 |
2021年 | 15篇 |
2020年 | 12篇 |
2019年 | 14篇 |
2018年 | 21篇 |
2017年 | 20篇 |
2016年 | 12篇 |
2015年 | 27篇 |
2014年 | 19篇 |
2013年 | 21篇 |
2012年 | 42篇 |
2011年 | 46篇 |
2010年 | 25篇 |
2009年 | 22篇 |
2008年 | 45篇 |
2007年 | 48篇 |
2006年 | 42篇 |
2005年 | 40篇 |
2004年 | 48篇 |
2003年 | 25篇 |
2002年 | 40篇 |
2001年 | 22篇 |
2000年 | 26篇 |
1999年 | 20篇 |
1998年 | 2篇 |
1997年 | 3篇 |
1995年 | 2篇 |
1994年 | 2篇 |
1992年 | 6篇 |
1991年 | 4篇 |
1990年 | 16篇 |
1989年 | 5篇 |
1988年 | 9篇 |
1987年 | 13篇 |
1986年 | 13篇 |
1985年 | 7篇 |
1984年 | 7篇 |
1983年 | 6篇 |
1982年 | 2篇 |
1980年 | 2篇 |
1979年 | 5篇 |
1975年 | 3篇 |
1974年 | 5篇 |
1973年 | 3篇 |
1970年 | 2篇 |
1969年 | 3篇 |
1946年 | 1篇 |
1944年 | 1篇 |
1906年 | 1篇 |
排序方式: 共有796条查询结果,搜索用时 9 毫秒
1.
The present authors investigated the excretion, distribution and pharmacokinetics of the novel potential antirheumatic agent flobufen and its active metabolite after p.o. and i.v. doses of 2, 10 and 50 mg/kg administered to rats. The drug is resorbed well from the digestive tract and mostly it is metabolized to the principal metabolite M, which is only slowly excreted from the organism mainly by renal clearance. Within the whole dose range the kinetics of the drug is linear. Binding of flobufen and M to proteins is high (95-99%). The highest concentrations of radioactive metabolites (mostly M) were found in the plasma, liver, lungs, kidneys, connective tissue and inflammatory foci. The penetration of metabolites through the placenta and excretion in human milk are relatively important. 相似文献
2.
Carlos Ferrer Albiach Antonio Conde Moreno Marta Rodríguez Cordón Virginia Morillo Macías Ana Bouché Babiloni Inmaculada Beato Tortajada Ángel Sánchez Iglesias Alicia Francés Muñoz 《Clinical & translational oncology》2010,12(1):22-26
Hypoxia is related to poor prognosis because it is associated to chemo-and radioresistance. During recent years the evolution
of imaging methods like PET/CT and MRI has meant the appearance of new perspectives with direct implications in radiation
therapy. We discuss previous experiences in staging, planning and in the follow-up process with these techniques for measuring
tumour hypoxia. 相似文献
3.
4.
The effect of 5-HT1A agonists was studied in the isolation-induced social behavioural deficit test. The drugs 8-OH-DPAT (0.125 mg/kg), buspirone (16 mg/kg) and ipsapirone (8 mg/kg) further increased the deficit. Unlike 8-OH-DPAT, the other two drugs may act non-specifically since they reduced spontaneous motor activity at 16 mg/kg, as measured in an activity meter. In addition, 8-OH-DPAT (0.25 mg/kg), buspirone (8 mg/kg) and ipsapirone (8 mg/kg) decreased exploratory activity in the open-field test. Since the smallest active doses were very close in the behavioural deficit and in the open-field tests, it is suggested that a common phenomenon, increased emotionality or reactivity, sustained both these reductions in activity. The increase in the behavioural deficit induced by 8-OH-DPAT, was likely to have resulted from stimulation of 5-HT1A receptors, since it was impaired by pretreatment with penbutolol, a beta-adrenergic-blocking drug, also known to bind to 5-HT1 receptors. Since it was previously shown that the behavioural deficit was reduced by agonists at 5-HT1B receptors, it is proposed that the behavioural inhibition, resulting from an isolation-induced increase in reactivity is bi-directionally modulated by serotonergic drugs, where 5-HT1A agonists increase and 5-HT1B agonists decrease this inhibition. 相似文献
5.
Bacterial DNA in patients with cirrhosis and sterile ascites. Its role as a marker of bacterial translocation and prognostic tool] 总被引:1,自引:0,他引:1
J M González-Navajas R Francés J Such 《Revista española de enfermedades digestivas》2007,99(10):599-603
During the last decade, we have witnessed an increase in the amount of data related with the presence of bacterial translocation in experimental models of cirrhosis. However, clinical studies have been limited by the lack of non-invasive methods to study this phenomenon. Over the past years, the research developed in our laboratory has been focused on the detection of bacterial DNA in serum and ascitic fluid of patients with cirrhosis and sterile ascites, the clinical and immunological implications of such finding. Initially, by means of a polymerase chain reaction (PCR)-based method and automated nucleotide sequencing, we were able to detect and identify the presence of fragments of bacterial DNA in the mentioned patients with culture-negative, non-neutrocytic ascites. Since then, we have accumulated a core of data suggesting that the presence of bacterial DNA may have an important role not only as a marker of bacterial translocation, but also as a short-term prognostic factor. Here, we discuss the past, present and future of this line of investigation. 相似文献
6.
Heymann MF Joubert M Nemeth J Franc B Visset J Hamy A le Borgne J le Neel JC Murat A Cordel S le Bodic MF 《Histopathology》2000,36(5):421-432
AIMS: To study the clinical outcome of 82 cases of pancreatic neuroendocrine tumours classified according to the recent histological and prognostic classification of Capella. METHODS AND RESULTS: Eighty-two surgical cases of pancreatic neuroendocrine tumours were examined histologically with immunohistochemical staining of paraffin sections using streptavidin-biotin complex and application of antibodies against chromogranin A and 10 hormonal peptides. Classification in four groups correlated with long follow-up and outcome of these cases. Histological examination showed 30 group I, four group II, 41 group III and seven group IV tumours. Twenty-one (70%) of group I tumours were insulinomas, whereas 25% of group III tumours were glucagonomas and 25% were unclassified. Most group IV tumours were unclassified, showing no immunohistochemical staining with any of the 10 hormonal peptides tested. Outcome was clearly correlated with tumour group. Among the 14 patients who died of the disease, four had group IV and 10 group III tumours. Thus, unclassified asymptomatic tumours without immunohistochemical staining had a poorer prognosis than asymptomatic tumours with staining. CONCLUSION: This study validates the Capella classification as easy to apply and useful in predicting clinical outcome. 相似文献
7.
8.
Pucciminafra I Luparello C Aquino A Basirico L Minafra S Franc S Yakovlev L Shoshan S 《International journal of oncology》1995,6(5):1015-1020
OF/LB collagen is a recently described once-fetal form of collagen, with laminin-binding properties, composed of three alpha(1)(I)-sized chains, one of which displaying an unusually acidic pI. This collagen appears able to direct the migration of breast cancer cells through Matrigel, and of injury-activated epithelial cells into the underlying granulation stromal tissue. The effect exerted by OF/LB collagen in vitro appears preferentially linked to its acidic chain. The data reported strongly support the hypothesis that the presence and accumulation of OF/LB collagen in cancer may play a fundamental role in the invasive growth. 相似文献
9.
Grazyna Faure Alenka Copic Sabine Le Porrier Franc Gubensek Cassian Bon Igor Krizaj 《Toxicon》2003,41(4):509-517
Crotoxin, a potent neurotoxin from the South American rattlesnake Crotalus durissus terrificus, is a heterodimeric phospholipase A(2) (EC 3.1.1.4), which blocks the release of acetylcholine from peripheral neurons. We previously have suggested the existence of a 48 kDa crotoxin-binding protein in the presynaptic membranes of the electric organ of Torpedo marmorata. Here, we report the purification and characterization of this protein that we called the crotoxin acceptor protein from Torpedo (CAPT). The membranes of electric organs from Torpedo were solubilized with a detergent (4% (w/v) Triton X-100) and CAPT was isolated by affinity chromatography on a crotoxin column. SDS-PAGE showed that the purified protein was homogeneous and cross-linking studies with radioiodinated crotoxin confirmed that it had retained its toxin-binding properties. The purified CAPT has similar molecular mass as crocalbin, a crotoxin-binding protein isolated from porcine brains, yet anti-crocalbin antiserum failed to recognize CAPT. Surface plasmon resonance biosensor technology was used to measure the specific interaction between crotoxin and solubilized CAPT. Using this method, it was possible to follow CAPT throughout the purification procedure. As well, an apparent dissociation constant (K(d)(app)) of 3.4 nM was calculated for the interaction of pure CAPT and crotoxin from the dissociation rate constant (k(off)=1.2 x 10(-2)s(-1)) and the association rate constant (k(on)=3.5 x 10(6)M(-1)s(-1)). 相似文献
10.
A FREQUENT OCCURRENCE: Dermatological manifestations are frequently observed in patients with relapsing polychondritis. However, they have not been extensively studied as polychondritis is a rare disease and the reported dermatological manifestations appear to be nonspecific. A WIDE SPECTRUM: The most frequently observed manifestations are aphthosis with sometimes complex aphthosis, nodular papular or purpuric lesions. Neutrophilic dermatosis has been reported in isolated cases. Histologically, these lesions correspond to nonspecific inflammatory infiltrates, vasculitis or thrombosis. Various pathological findings are observed in nodular lesions. RELATED AND OVERLAP CONDITIONS: Similar dermatological manifestations occur in Beh?et's syndrome and in inflammatory bowel diseases. Patients with relapsing polychondritis and myelodysplasia very frequently have dermatological manifestations. Repeated blood cell determinations are therefore necessary in patients with relapsing polychondritis and dermatological manifestations. 相似文献