全文获取类型
收费全文 | 16812篇 |
免费 | 1187篇 |
国内免费 | 49篇 |
专业分类
耳鼻咽喉 | 179篇 |
儿科学 | 591篇 |
妇产科学 | 261篇 |
基础医学 | 2032篇 |
口腔科学 | 468篇 |
临床医学 | 1550篇 |
内科学 | 3556篇 |
皮肤病学 | 293篇 |
神经病学 | 2063篇 |
特种医学 | 498篇 |
外国民族医学 | 1篇 |
外科学 | 2551篇 |
综合类 | 155篇 |
一般理论 | 6篇 |
预防医学 | 1374篇 |
眼科学 | 323篇 |
药学 | 1041篇 |
中国医学 | 13篇 |
肿瘤学 | 1093篇 |
出版年
2022年 | 116篇 |
2021年 | 251篇 |
2020年 | 198篇 |
2019年 | 266篇 |
2018年 | 292篇 |
2017年 | 243篇 |
2016年 | 312篇 |
2015年 | 310篇 |
2014年 | 438篇 |
2013年 | 606篇 |
2012年 | 878篇 |
2011年 | 908篇 |
2010年 | 514篇 |
2009年 | 466篇 |
2008年 | 909篇 |
2007年 | 885篇 |
2006年 | 941篇 |
2005年 | 798篇 |
2004年 | 715篇 |
2003年 | 746篇 |
2002年 | 674篇 |
2001年 | 464篇 |
2000年 | 498篇 |
1999年 | 406篇 |
1998年 | 195篇 |
1997年 | 181篇 |
1996年 | 170篇 |
1995年 | 164篇 |
1994年 | 133篇 |
1993年 | 130篇 |
1992年 | 286篇 |
1991年 | 309篇 |
1990年 | 274篇 |
1989年 | 267篇 |
1988年 | 222篇 |
1987年 | 201篇 |
1986年 | 208篇 |
1985年 | 207篇 |
1984年 | 154篇 |
1983年 | 137篇 |
1982年 | 92篇 |
1981年 | 99篇 |
1979年 | 149篇 |
1978年 | 126篇 |
1977年 | 105篇 |
1976年 | 94篇 |
1975年 | 121篇 |
1974年 | 118篇 |
1973年 | 104篇 |
1972年 | 93篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.
Neill Booth Antti Jula Pasi Aronen Minna Kaila Timo Klaukka Katriina Kukkonen-Harjula Antti Reunanen Pekka Rissanen Harri Sintonen Marjukka Mäkelä 《BMC health services research》2007,7(1):172
Background
Hypertension is one of the major causes of disease burden affecting the Finnish population. Over the last decade, evidence-based care has emerged to complement other approaches to antihypertensive care, often without health economic assessment of its costs and effects. This study looks at the extent to which changes proposed by the 2002 Finnish evidence-based Current Care Guidelines concerning the prevention, diagnosis, and treatment of hypertension (the ACCG scenario) can be considered cost-effective when compared to modelled prior clinical practice (the PCP scenario). 相似文献43.
Menahem Neuman Boris Friedman Avi Stein A. Ami Sidi Alexander Tsivian 《Gynecological surgery》2007,4(3):175-178
The objective of the study was to compare the clinical outcomes at the short-term follow-ups of two novel transobturator mid-urethral
sling procedures – the transobturator tape (TOT) procedure and the tension-free vaginal tape (TVT)-obturator procedure. The
study cohort consisted two groups of 40 women with urodynamically proven stress urinary incontinence (SUI). The patients in
one group underwent the TOT procedure, performed according to Delorme (Prog Urol 11:1306–1313, 2001); those in the second
group underwent the TVT-obturator operation, performed according to de Leval (Eur Urol 44:724–730, 2003). Intra-operative
diagnostic cystoscopy was not performed with either the TVT-obturator or the TOT procedures. The average follow-up was 12 months.
The two patient groups were similar in terms of demographic and therapeutic criteria, except for patient age, which was significantly
younger in the TVT-obturator group. Previously reported TVT-related operative complications, such as bladder penetration,
intra-operative bleeding, field infection and post-operative pelvic floor relaxation, were not observed in patients of either
group. Bowel and urethral injuries were also not recorded. The therapeutic failure rates were 10% for the TOT procedure and
5% for the TVT-obturator procedure. Urinary frequency and urgency post-operatively were reported in 25% of the TOT patients
and 19% of the TVT-obturator patients, pelvic or vaginal pain affected 10% of the TOT and 5% of the TVT-obturator patients,
while post-operative voiding difficulty was experienced by 12.5% of the TOT and 7.5% of the TVT-obturator patients. None of
the above-mentioned differences between the two patient groups were of statistical significance. The TVT-obturator and TOT
procedures, both minimally invasive, novel, mid-urethral sling procedures, seem to be safe, easy-to-perform and effective
in treating female SUI. The patients of both study groups suffered less intra- and post-operative surgical complications than
previously been reported in connection with the TVT operation. The TVT-obturator patients had fewer therapeutic failures,
less post-operative urinary frequency and urgency, less pelvic pain and less voiding difficulty. All of these findings, however,
had no statistical significance; consequently, long-term comparative data collection will be required before solid conclusions
can be drawn on the superiority of either of these two operative techniques. 相似文献
44.
Chris Chase Robert F Dougherty Nicola Ray Susan Fowler John Stein 《Optometry and vision science》2007,84(3):229-236
PURPOSE: Many behavioral studies have found impaired perception of dynamic visual stimuli in dyslexia and several neuroimaging studies have found reduced activation of the human motion area MT+ in dyslexia. These results are often interpreted as a magnocellular (MC) deficit in dyslexia. It has also been claimed that colored filters can help dyslexics to read. One defining feature of the MC-pathway is a greater weight for L-cone input than M-cone input, and at most very weak S-cone input. We measured the subjective speed matches between L-, M-, and S-cone isolating stimuli in good and poor readers. METHODS: Subjects performed a speed-matching task with drifting cone-isolating stimuli to find the point of subjective equality between two drifting patterns. Such a task is known to activate cortical area MT+, presumably via the MC-pathway. RESULTS: L- to M-cone speed-match ratios were negatively correlated with single-word (r=-0.46) and irregular-word reading (r=-0.56) but not with non-word reading. CONCLUSIONS: Results suggest that relative L-cone sensitivity within the MC-pathway may limit orthographic reading performance. 相似文献
45.
46.
Factors that determine the magnitude and time course of human H-reflexes in locomotion 总被引:7,自引:0,他引:7
The soleus H-reflex amplitude is deeply modulated during locomotion in humans (Capaday and Stein, 1986). Moreover, at a constant stimulus intensity, the slope of the relationship between the amplitude of the soleus H-reflex and the background electromyogram (EMG) changes with different locomotor tasks (Capaday and Stein, 1987a). Two further aspects are studied here. First, we recorded the reflex during overlapping speeds of walking (2.0-7.5 km/hr) and running (5-9 km/hr) to determine whether the speed, the motor output, or the form of locomotion was most important in setting the slope of this relationship between H-reflex and background EMG. Second, we determined the time course of change in the H-reflex amplitude and the possible site of action for the reflex depression during the transition from standing to walking. The primary determinant of the slope was found to be the form of locomotion. The differences between running and walking could not be explained entirely by either movement speed or motor output. For walking, the slope varied inversely with the speed and the motor output of locomotion. This compensation in slope as a function of motor output may prevent saturation of the motoneuron pool. The appropriate reflex amplitudes for a particular locomotor pattern are activated rapidly and completely within a reaction time, and simultaneously with the activation of muscle activity for the initiation of walking. Mechanisms for the rapid change seen during the initiation of locomotion most likely act presynaptically on the muscle spindle afferents. The time course and magnitude of this change are correlated with the activity of the tibialis anterior muscle. 相似文献
47.
48.
49.
P-fimbriae vaccines 总被引:3,自引:0,他引:3
M. Bernice Kaack Auli Pere Timo K. Korhonen Stefan B. Svenson James A. Roberts 《Pediatric nephrology (Berlin, Germany)》1989,3(4):386-390
To test for cross-protective capacity of two different P-fimbriae vaccines we vaccinated baboons with fimbriae purified from either Escherichia coli strain ER2 or strain JR1. The vaccinated animals showed elevated antibody titers to P-fimbriae from each of the E. coli strains used, suggesting cross-reactivity as was expected from the results of immunoprecipitation of the fimbriae. Enzyme-linked immunosorbent assay inhibition by heterologous P-fimbriae proved this to be true immunologic cross-reactivity. 相似文献
50.
Paradoxical movement in Parkinson's disease. 总被引:6,自引:0,他引:6
Patients with Parkinson's disease, although impaired, can sometimes move effectively under visual guidance. The stimuli that often elicit such paradoxical movement are similar to those that relay visual information to the cerebellum. We suggest that many instances of paradoxical movement may be explained by the fact that the pathways relaying those visual stimuli can bypass the damaged basal ganglia and allow an intact cerebellar circuit to be used for visuomotor control. 相似文献