全文获取类型
收费全文 | 3373182篇 |
免费 | 268220篇 |
国内免费 | 6044篇 |
专业分类
耳鼻咽喉 | 48525篇 |
儿科学 | 107563篇 |
妇产科学 | 93037篇 |
基础医学 | 475047篇 |
口腔科学 | 99431篇 |
临床医学 | 306633篇 |
内科学 | 653115篇 |
皮肤病学 | 70344篇 |
神经病学 | 280735篇 |
特种医学 | 134311篇 |
外国民族医学 | 1247篇 |
外科学 | 506973篇 |
综合类 | 82928篇 |
现状与发展 | 4篇 |
一般理论 | 1426篇 |
预防医学 | 272181篇 |
眼科学 | 79794篇 |
药学 | 252312篇 |
7篇 | |
中国医学 | 6249篇 |
肿瘤学 | 175584篇 |
出版年
2018年 | 33604篇 |
2016年 | 28896篇 |
2015年 | 33033篇 |
2014年 | 46910篇 |
2013年 | 71740篇 |
2012年 | 96433篇 |
2011年 | 101995篇 |
2010年 | 60263篇 |
2009年 | 57527篇 |
2008年 | 97123篇 |
2007年 | 102869篇 |
2006年 | 104024篇 |
2005年 | 101165篇 |
2004年 | 98193篇 |
2003年 | 94518篇 |
2002年 | 93308篇 |
2001年 | 153518篇 |
2000年 | 158981篇 |
1999年 | 134981篇 |
1998年 | 39144篇 |
1997年 | 35490篇 |
1996年 | 34991篇 |
1995年 | 33935篇 |
1994年 | 31922篇 |
1993年 | 29858篇 |
1992年 | 109689篇 |
1991年 | 106061篇 |
1990年 | 102953篇 |
1989年 | 99465篇 |
1988年 | 92454篇 |
1987年 | 91215篇 |
1986年 | 86624篇 |
1985年 | 83054篇 |
1984年 | 63001篇 |
1983年 | 54074篇 |
1982年 | 32661篇 |
1981年 | 29177篇 |
1980年 | 27489篇 |
1979年 | 59838篇 |
1978年 | 42092篇 |
1977年 | 35521篇 |
1976年 | 33313篇 |
1975年 | 35267篇 |
1974年 | 43490篇 |
1973年 | 41540篇 |
1972年 | 38704篇 |
1971年 | 36030篇 |
1970年 | 33644篇 |
1969年 | 31418篇 |
1968年 | 28657篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
Laterality of cross-modal spatial processing 总被引:1,自引:0,他引:1
J O Adams P D Duda 《Cortex; a journal devoted to the study of the nervous system and behavior》1986,22(4):539-552
This study examined the laterality of spatial-form perception in normal adults using a cross-modal matching paradigm involving visual and tactile processing. Randomly generated eight-point and 12-point Vanderplas and Garvin (1959) patterns were used as the stimuli. In a visual-to-tactile task, a lateralized visual pattern was followed immediately by a haptic task requiring subjects to discriminate which of two simultaneously felt shapes matched the visual pattern. In a tactile-to-visual task, subjects decided which of two simultaneously felt shapes matched a lateralized visual pattern presented after haptic manipulation. There were no main effects for laterality or for sex differences. Matching accuracy was better in the visual-to-tactile task and for less complex stimuli. A visual field by feeling hand interaction showed best recognition accuracy when visual-feeling hand combinations on the same side of the body were used in the two matching tasks. These data reflect a stimulus-response compatibility explanation of spatial-form perception that is consistent with a behavioral and not a cerebral asymmetry model. 相似文献
992.
D Mabin J P Borsotti S Tea J C Le Mevel J Clavier 《Revue d'électroencéphalographie et de neurophysiologie clinique》1986,15(4):341-348
Eleven patients with bronchial epidermoid carcinoma and undergoing treatment with cis-D.D.P. (II) were kept under electrophysiological and clinical surveillance. No other neurotoxic medication was added. The total dose of cis-D.D.P. was 300 mg/m2 over a period of three months: namely, three courses of 100 mg/m2 distributed over 5 days. Following the pretreatment check-up, the patients were divided into two groups: those without any electrophysiological abnormality (group A), and those without clinical abnormality but with a delayed latency H of the Hoffmann Reflex (group B). Patients in group A showed a slowing down of the motor nerve conduction velocity of the Median and Peroneal Nerves after a course of 100 mg, without accompanying worsening of the conduction velocity after 300 mg/m2, and prolongation of the distal latency of the sensory Median Nerve after 300 mg/m2; in group B, no significant change of electrophysiological clinical features were noted. In the two groups a non-significant reduction in amplitude of evoked responses were noted. These findings are more consistent with an axonal injury than with functional myelin injury. The authors review the existing literature and discuss the physiopathologic mechanisms of cis-D.D.P. peripheral neuropathies. 相似文献
993.
Cocaine-treated rats acquired a preference for cocaine-associated contextual stimuli (CS) relative to saline-injected control rats. However, when animals were given repeated tests for conditioned place preference intermittent between conditioning trials, they displayed an attenuation in strength of conditioning. This attenuation was not due to pharmacologic tolerance (Experiment 1), but rather reflected a disruption in learning due to exposure to the CS alone (Experiment 2). Like other examples of classical conditioning, the strength of the conditioned response (CR) as assessed by the conditioned place preference model may be influenced by partial reinforcement. 相似文献
994.
Western transfer and immunoenzymatic staining with affinity-purified monospecific antiserum was used to detect a 38-Kd protein that bound to native and denatured DNA cellulose. This protein has previously been shown to be a delayed early herpes simplex virus type-2 specific protein. 相似文献
995.
996.
997.
Epidemiology of chlamydial eye diseases in a mixed rural/urban population of West Germany 总被引:1,自引:0,他引:1
4260 conjunctival specimens of 2850 outpatients with keratoconjunctivitis of presumed infectious etiology were studied. Two thousand six hundred sixty-eight specimens (63%) revealed growth of bacteria, and 80 (2%) growth of fungi. One hundred ninety-nine specimens (5%) were McCoy cell culture or direct stain (monoclonal antibody or Giemsa) positive for Chlamydia trachomatis. two patients had a C. psittaci infection (ELISA techniques). In patients with keratoconjunctivitis of bacterial etiology, overall incidence of McCoy cell culture-proven chlamydial infections was 7%; in the 20 to 30-year age group it was 12.5%. Simultaneous infections of chlamydiae and other bacteria were seen in 34 patients. Since sensitive and specific tests to diagnose chlamydial infections are available, ophthalmologists may be able to prevent these infections by agent-specific antibiotic therapy. 相似文献
998.
The Brief Symptom Inventory (BSI), a 53-item psychiatric symptom checklist, was administered to 57 alcoholic inpatients on days 2, 10, 18 and 26 of their 28-day stay in an alcoholism rehabilitation unit at a Veterans Administration hospital. The results of the test show a steady decline in the patients' psychiatric symptomatology from week 1 to week 4 with the most dramatic improvement evidenced between weeks 1 and 2. 相似文献
999.
The relationship between the immunoglobulin kappa light chain allotypes and autoantibodies was studied in a series of seven human monoclonal kappa-bearing IgM antibodies with Rheumatoid Factor (RF) activity, two IgM anti-low density lipoprotein (LDL) antibodies, and one IgM anti-intermediate filament (IF) antibody. Residues at amino acid positions 153 and 191 related to the Km allotypes in human kappa chains were determined by an HPLC tryptic fingerprint and corroborated by amino acid sequence analysis. All the autoantibodies shared similar variable regions derived from the V kappa IIIb gene(s). The seven RF and the anti-IF were associated with the Km(3) constant region allotype whereas the two anti-LDL were associated with the Km(1,2) allotype. Thus, monoclonal autoantibodies showed the same Km allotypic distribution as the normal population. However, although the number of samples is small, it seems likely that a preferential association may exist between particular V kappa genes and Km alleles in the generation of autoantibodies with different specificities. 相似文献
1000.
R W Wulkan L Zwang T L Liem B G Blijenberg B Leijnse 《Zeitschrift für klinische Chemie und klinische Biochemie》1987,25(10):719-722
An expert system for evaluation of X-ray diffraction patterns of urinary calculi is described and evaluated. The software was developed using the PERSONAL CONSULTANT expert system shell from Texas Instruments. 相似文献