全文获取类型
收费全文 | 3455篇 |
免费 | 202篇 |
国内免费 | 14篇 |
专业分类
耳鼻咽喉 | 34篇 |
儿科学 | 69篇 |
妇产科学 | 55篇 |
基础医学 | 489篇 |
口腔科学 | 24篇 |
临床医学 | 409篇 |
内科学 | 794篇 |
皮肤病学 | 86篇 |
神经病学 | 391篇 |
特种医学 | 113篇 |
外国民族医学 | 1篇 |
外科学 | 458篇 |
综合类 | 9篇 |
预防医学 | 141篇 |
眼科学 | 51篇 |
药学 | 214篇 |
中国医学 | 5篇 |
肿瘤学 | 328篇 |
出版年
2023年 | 19篇 |
2022年 | 43篇 |
2021年 | 98篇 |
2020年 | 58篇 |
2019年 | 105篇 |
2018年 | 111篇 |
2017年 | 64篇 |
2016年 | 65篇 |
2015年 | 89篇 |
2014年 | 136篇 |
2013年 | 162篇 |
2012年 | 255篇 |
2011年 | 282篇 |
2010年 | 139篇 |
2009年 | 143篇 |
2008年 | 226篇 |
2007年 | 219篇 |
2006年 | 187篇 |
2005年 | 212篇 |
2004年 | 192篇 |
2003年 | 179篇 |
2002年 | 174篇 |
2001年 | 50篇 |
2000年 | 51篇 |
1999年 | 54篇 |
1998年 | 33篇 |
1997年 | 22篇 |
1996年 | 16篇 |
1995年 | 26篇 |
1994年 | 10篇 |
1993年 | 10篇 |
1992年 | 18篇 |
1991年 | 19篇 |
1990年 | 15篇 |
1989年 | 18篇 |
1988年 | 8篇 |
1987年 | 19篇 |
1986年 | 16篇 |
1985年 | 10篇 |
1984年 | 9篇 |
1983年 | 12篇 |
1980年 | 5篇 |
1979年 | 7篇 |
1977年 | 9篇 |
1976年 | 10篇 |
1974年 | 6篇 |
1971年 | 9篇 |
1970年 | 9篇 |
1969年 | 4篇 |
1965年 | 5篇 |
排序方式: 共有3671条查询结果,搜索用时 15 毫秒
1.
2.
Franck Ceppa Stephane Gidenne Alain Benois Eleonore Fontan Pascal Burnat 《Clinical chemistry and laboratory medicine》2002,40(8):799-801
Human butyrylcholinesterase is the enzyme responsible of mivacurium and succinylcholine metabolism, which may be significantly impaired when mutation Asp70Gly is found in patients. We describe a simple PCR method for the detection of this variant. Thirteen out of sixteen patients tested after prolonged apnea were positive for the presence of this mutation (50.0% homozygotes and 31.3% heterozygotes), suggesting that this test contributes to the explanation of some clinical events and to their prevention in relatives of these patients. 相似文献
3.
Christiane Knoop Philippe Thiry Franck Saint-Marcoux Annick Rousseau Pierre Marquet Marc Estenne 《American journal of transplantation》2005,5(6):1477-1482
In cystic fibrosis (CF), absorption of tacrolimus through the gastrointestinal tract may be impaired due to fat malabsorption. The aim of this pilot study was to compare tacrolimus pharmacokinetics and inter- and intrasubject variability of exposure in stable lung transplant recipients with and without CF, and to determine the best single-time predictors of exposure. The study included 11 lung transplant recipients with CF and 11 without CF who received tacrolimus twice daily. Blood samples were obtained predose and at 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 8 and 12 h postdose on 3 separate days within 1 week. Tacrolimus pharmacokinetics and inter- and intrasubject variability of exposure were similar in the two groups, though exposure-per-milligram-dose was approximately 50% lower in CF patients. Tacrolimus trough concentration did not accurately predict the area under the concentration curve (AUC(0-12)), but the concentration measured 3 h postdose (C(3)) was tightly correlated with the AUC(0-12) in both CF (r(2)= 0.86) and non-CF (r(2)= 0.92) patients. In summary, patients with CF have a higher tacrolimus oral clearance, but nonsignificant differences in short-term inter- and intrasubject variability of exposure compared to patients without CF. C(3) is tightly correlated with AUC(0-12) in lung transplant recipients with and without CF. 相似文献
4.
Jean-Yves Baudouin Flavie Martin Guy Tiberghien Isabelle Verlut Nicolas Franck 《Neuropsychologia》2002,40(5):503-511
The selective attention to facial emotion and identity was investigated in 12 patients with schizophrenia and 12 healthy participants. Both patients and controls were required to perform two classification tasks (according either to identity or emotion). Two separate values for identity (person A/person B) and for emotion (fear/anger) were used. When the classification task was on one dimension, the other dimension was either correlated, constant, or orthogonal (Garner WR. The Processing of Information and Structure. Potomac, MD: Erlbaum, 1974, Garner WR. Interaction of stimulus dimensions in concept and choice processes. Cognitive Psychology 1976;8:98-123). Results indicated that both patients and healthy participants had an asymmetrical pattern of performance: they were able to selectively attend to the identity of the face presented, regardless of the emotion expressed on the face, but variation in identity interfered with the classification of facial emotion. Moreover, a correlational study indicated that the identity interference on emotion classification for schizophrenic patients covaried with the severity of their negative symptoms. The selective attention competencies in schizophrenia and the independence hypothesis of emotion and face recognition are discussed in the framework of current face recognition models. 相似文献
5.
6.
F Sellal E Hirsch P Maquet E Salmon G Franck M Collard D Kurtz C Marescaux 《Revue neurologique》1991,147(2):121-128
In recent years, a differentiation has been made between two syndromes that are characterized by brief abnormal paroxysmal movements occurring principally at night: 1, hypnogenic paroxysmal dystonia (HPD), sometimes considered a particular form of dystonia similar to paroxysmal kinesigenic choreoathetosis, and 2, mesiofrontal epilepsy. Whether HPD is a distinct syndrome is not clear. Twenty-three patients, 11 men and 12 women, were hospitalized between 1985 and 1989 for examination of this type of abnormal paroxysmal movements (APM) occurring at night. In order to clarify the physiopathology of these abnormal nocturnal movement as focal epilepsy or a particular form of dystonia, we analyzed the personal and familial antecedents of all 23 patients, the polygraphic records during waking and sleep periods, and the results of neuroradiological examinations. Four patients were examined by positron emission tomography (PET) using i8F deoxyglucose. Symptoms first appeared between 3 and 28 years of age (M, 10.1) and developed over 1 to 20 years (M, 10.1). APM clearly occurred more commonly (greater than 90%) during sleep, usually during phases of slow-wave sleep. The sleeping patient opened his eyes and the motor signs then variously associated affective facial expression; axial postural modifications; tonic, dystonic or choreic postural movements of the limbs; pedalling; automatisms; disordered agitation and vocalization. The seizure was abruptly interrupted after 10 to 60 seconds. There was usually no postictal confusion. Thirteen patients clearly had clear epileptic antecedents: in 9, generalized tonic-clonic seizures; in 4, focal epileptic status. During nocturnal polygraphic recording, 6 patients presented a generalized seizure following a period of APM.(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献
7.
The authors report the results of a Positron Emission Tomographic (PET) study of local cerebral blood flow and oxygen consumption in one patient with a right capsulo-thalamic ischemic lesion. That lesion is well demonstrated using X-ray CT Scan. PET study demonstrates a decreased perfusion and metabolism at three levels: first in right thalamus region, second in whole right hemisphere, more marked at orbitofrontal area and third at the level of the left cerebellar hemisphere. The authors point out the usefulness of PET studies which allow a better understanding of clinical signs by demonstrating functional consequences of damage in deeply located structures such as thalamus and internal capsule on cerebral and cerebellar cortices. 相似文献
8.
Yannick Poquet Patricia Constant Franck Halary Marie-Alix Peyrat Martine Gilleron François Davodeau Marc Bonneville Jean-Jacques Fournié 《European journal of immunology》1996,26(10):2344-2349
The stimulation of human γδ T cells by mycobacteria occurs through recognition of four distinct nonpeptide phosphorylated antigens termed TUBag1–4. Among these latter, TUBag4 has already been biochemically characterized as a γ-X derivative of 5′-deoxythymidine triphosphate (Constant, P., Davodeau, F., Peyrat, M. A., Poquet, Y., Puzo, G., Bonneville, M. and Fournié, J.-J., Science 1994. 264: 267). However, despite chemical synthesis of weakly stimulatory nucleotide-containing analogs, these mycobacterial compounds remained the sole nucleotide-containing antigens actually isolated from natural sources. Here, we present the complete isolation of the TUBag3 antigen from Mycobacterium fortuitum and demonstrate that this nonpeptide molecule contains a 5′-UTP nucleotide moiety. On selected Vγ9/Vδ2 clones, T cell responses can be triggered with nanomolar concentrations of TUBag3. Like crude mycobacterial extracts, this purified nucleotide conjugate elicits a strong polyclonal response of γδ PBL from healthy donors. Furthermore, we present evidence that this compound is distinct from the recently synthesized γ-isopentenyl 5′-UTP, a nucleotide conjugate of isopentenyl pyrophosphate that was found to be stimulatory for human γδ T cells (Tanaka, Y., Morita, C. T., Tanaka, Y., Nieves, E., Brenner, M. B. and Bloom, B. R., Nature 1995. 375: 155). Since it appears that both mycobacterial nucleotide antigens are molecules structurally related to peculiar precursors of nucleic acid synthesis, we propose that TUBag-reactive T cells might be specifically devoted to surveillance of proliferating cells. 相似文献
9.
In reaction time (RT) tasks, event-related potentials (ERPs) reveal a response-locked negative wave when subjects commit errors. This wave, termed "error negativity" (Ne) or "error-related negativity" (ERN), is thought to index response-monitoring processes. With conventional monopolar recordings, this negativity is hardly seen on correct responses, likely overlapped by a large positive wave. Indeed, after Laplacian transformation (a spatial high-pass filter), a small Ne-like wave is unmasked. Recently, it has been shown that the positivity on monopolar recordings was larger for correct responses preceding an error than for correct responses preceding a correct trial. After Laplacian transformation, it appears that this effect is due, at least in part, to a decrease of the Ne-like wave on correct responses preceding an error. This result indicates that, as the Ne on errors, the Ne-like wave on correct responses is sensitive to performance and hence is likely related to response-monitoring processes. 相似文献
10.
Eisele M Heukelbach J Van Marck E Mehlhorn H Meckes O Franck S Feldmeier H 《Parasitology research》2003,90(2):87-99
Tungiasis is an important health problem in poor communities in Brazil and is associated with severe morbidity, particularly in children. The causative agent, the female flea Tunga penetrans, burrows into the skin of its host, where it develops, produces eggs and eventually dies. From the beginning of the penetration to the elimination of the carcass of the ectoparasite by skin repair mechanisms, the whole process takes 4-6 weeks. The present study is based on specimens from 86 patients, for some of whom the exact time of penetration was known. Lesions were photographed, described in detail and biopsied. Biopsies were examined histologically and by means of scanning electron microscopy (SEM). Based on clinical, SEM and histological findings, the "Fortaleza classification" was elaborated. This allows the natural history of tungiasis to be divided into five stages: (1) the penetration phase, (2) the phase of beginning hypertrophy, (3) the white halo phase, (4) the involution phase and (5) residues in the host's skin. Based on morphological and functional criteria, stages 3 and 4 are divided into further substages. The proposed Fortaleza classification can be used for clinical and epidemiological purposes. It allows a more precise diagnosis, enables the assessment of chemotherapeutic approaches and helps to evaluate control measures at the community level. 相似文献