全文获取类型
收费全文 | 7393篇 |
免费 | 437篇 |
国内免费 | 38篇 |
专业分类
耳鼻咽喉 | 57篇 |
儿科学 | 181篇 |
妇产科学 | 124篇 |
基础医学 | 1071篇 |
口腔科学 | 97篇 |
临床医学 | 615篇 |
内科学 | 1677篇 |
皮肤病学 | 119篇 |
神经病学 | 631篇 |
特种医学 | 314篇 |
外国民族医学 | 1篇 |
外科学 | 1338篇 |
综合类 | 77篇 |
一般理论 | 3篇 |
预防医学 | 493篇 |
眼科学 | 95篇 |
药学 | 497篇 |
中国医学 | 11篇 |
肿瘤学 | 467篇 |
出版年
2023年 | 32篇 |
2022年 | 66篇 |
2021年 | 147篇 |
2020年 | 80篇 |
2019年 | 118篇 |
2018年 | 166篇 |
2017年 | 109篇 |
2016年 | 125篇 |
2015年 | 153篇 |
2014年 | 219篇 |
2013年 | 347篇 |
2012年 | 446篇 |
2011年 | 496篇 |
2010年 | 313篇 |
2009年 | 271篇 |
2008年 | 451篇 |
2007年 | 501篇 |
2006年 | 399篇 |
2005年 | 476篇 |
2004年 | 439篇 |
2003年 | 428篇 |
2002年 | 370篇 |
2001年 | 130篇 |
2000年 | 110篇 |
1999年 | 133篇 |
1998年 | 85篇 |
1997年 | 89篇 |
1996年 | 66篇 |
1995年 | 54篇 |
1994年 | 50篇 |
1993年 | 51篇 |
1992年 | 67篇 |
1991年 | 52篇 |
1990年 | 65篇 |
1989年 | 55篇 |
1988年 | 40篇 |
1987年 | 40篇 |
1986年 | 33篇 |
1985年 | 29篇 |
1984年 | 28篇 |
1983年 | 37篇 |
1982年 | 25篇 |
1980年 | 26篇 |
1979年 | 23篇 |
1978年 | 28篇 |
1976年 | 18篇 |
1974年 | 19篇 |
1973年 | 24篇 |
1932年 | 19篇 |
1931年 | 17篇 |
排序方式: 共有7868条查询结果,搜索用时 15 毫秒
11.
12.
Christian Boewer Gottfried Enderlein Udo Wollgast Stefan Nawka Hubert Palowski Renate Bleiber 《International archives of occupational and environmental health》1988,60(3):181-186
Summary In a cross-sectional study of 181 male workers of a rotogravure printing plant, most of whom were exposed to toluene levels well above the GDR threshold limit values, 55 subjects revealed pathological liver screening values (activities of serum aspartate aminotransferase, alanine amino-transferase, gamma glutamyltransferase; liver size). The differential diagnostic examination showed in 51 out of these 55 subjects an association with competing factors such as alcohol abuse (78%) and overweight (40%), to a slight extent disorders of fat and carbohydrate metabolism and of the gallbladder. Drug intake did not play any role. The variance and regression analyses of the biochemical data have shown that alcohol significantly and considerably increases the activities of all three enzymes tested. Bodyweight had a similar, but less pronounced, significant effect. On the other hand, in subjects with a higher alcohol intake the activities of liver enzymes in highly toluene exposed subgroups were significantly and clearly lower than among slightly toluene exposed workers. 相似文献
13.
Ligia Teban Hubert Pehamberger Klaus Wolff Michael Binder Harald Kittler 《Journal der Deutschen Dermatologischen Gesellschaft》2003,1(4):292-296
Background and objectives: The aim of this study was to evaluate the practical value of the dermatoscopic classification of Clark nevi Patients and methods: Dermatoscopic images of 268 lesions clinically and dermatoscopically diagnosed as Clark nevi were presented to 2 dermatologists without knowledge of the histological diagnosis. The dermatologists evaluated the lesions according to a simplified version of the classification scheme for Clark nevi proposed by Hofmann‐Wellenhof and differentiated between 12 different types of Clark nevi. Results: The most common type of Clark nevus was the reticular‐homogenous type (n = 64, 23,9 %), followed by the globular‐homogeneous type (n = 32, 12 %) and by the homogenous type (n = 30, 11,2 %). The overall inter‐rater agreement between the examiners was moderate to good (kappa = 0,58). The highest level of agreement was found for the peripheral hyperpigmented type (kappa = 0,83). Histologically, 17 lesions (6,3 %) were diagnosed as melanomas. The frequency of melanoma was highest among the peripheral‐hyperpigmented type for one observer and among the homogenous type for the other observer. No melanoma was found among the globular, reticular‐globular, and the central‐hyperpigmented types. Conclusions: A dermatoscopic classification of Clark nevi is practically feasible and allows – to some extent – a risk stratification of Clark nevi, which could be useful for clinical management. 相似文献
14.
Peter Van Gelder Sergey Lebedev Wai Hon Tsui 《Experimental brain research. Experimentelle Hirnforschung. Expérimentation cérébrale》1997,116(2):201-215
Smooth pursuit typically includes corrective catch-up saccades, but may also include such intrusive saccades away from the
target as anticipatory or large overshooting saccades. We sought to differentiate catch-up from anticipatory and overshooting
saccades by their peak velocities, to see whether the higher velocities of visually rather than nonvisually guided saccades
in saccadic tasks may be found also in saccades in pursuit. In experiment 1, 12 subjects showed catch-up, anticipatory, and
overshooting saccades to comprise 70.4% of all saccades in pursuit of periodic, 30°/s constant-velocity targets. Catch-up
saccades were faster than the others. Saccadic tasks were run as well, on 19 subjects, including the 12 whose pursuit data
were analyzed, with target-onset, target-remaining (saccade to the remaining target when the other three extinguish), and
antisaccade tasks. For 17 of the 19 subjects, antisaccade velocities were lower than for either target-onset or target-remaining
tasks. Velocities for the target-remaining task were near those for target onset, indicating that target presence, not its
onset, defines visually guided saccades. Error and reaction-time data suggest greater cognitive difficulty for target remaining
than for target onset, so that the cognitive difficulty of typical nonvisually guided saccade tasks is not sufficient to produce
their lowered velocity. To produce reliably, in each subject, catch-up and anticipatory saccades with comparable amplitude
distributions, nine new subjects were asked in experiment 2 to make intentional catch-up and anticipatory saccades in pursuit,
and were presented with embedded target jumps to elicit catch-up saccades, all with periodic target trajectories of 15°/s
and 30°/s. Velocities of intentional anticipatory saccades were lower than velocities of intentional catch-up saccades, while
velocities of intentional and embedded catch-up saccades were similar. Target-onset and remembered-target saccadic tasks were
run, showing the expected higher velocity for the target-onset task in each subject. Both experiments demonstrate higher peak
velocities for catch-up saccades than for anticipatory saccades, suggesting that cortical structures preferentially involved
in nonvisually guided saccades may initiate the anticipatory and overshooting saccades in pursuit.
Received: 1 December 1995 / Accepted: 25 February 1997 相似文献
15.
16.
Stroke-induced hemiballismus (HB) has been reported to improve motor function in people with Parkinson's disease (PD). We report on a patient who developed HB from a parietal infarct. The HB was improved by very low-dose clozapine but the HB did not improve the parkinsonism. This suggests that HB itself, whether from a lesion in the subthalamic nucleus or elsewhere, is not what improves motor function in PD; instead, the physiological function of the damaged structure is the determining factor. 相似文献
17.
This study investigated the temporal evolution in the discrimination of the newborn's crying by the mother, from the first to the eighth day after birth. The sample included twenty human mothers who had had an uneventful pregnancy, labour and delivery. They were asked to identify the spontaneous cries of their newborn babies from tape-recorded cries containing cries from their own newborn and from three other newborns. On the first day, the percentage of correct answers was 48#pc, then 81 #pc on the eighth day. Two acoustic features that may underlie this discrimination were analyzed: the maximum Fo values and the average number of cry bursts per second. On the seventh day, these two acoustic variables and the discrimination abilities significantly correlate. 相似文献
18.
Claude Clément MD Roberto Ruiz MD Bogdan Costa-Foru MD Hubert Nicaise MD 《Annals of vascular surgery》1990,4(3):305-308
Extrinsic compression of the renal artery due to a fibromuscular band originating from the diaphragm was encountered in a 26-year-old patient who had systemic hypertension associated with stenosis and kinking of one of her renal arteries. After surgical decompression, the renal artery assumed a normal expansion with disappearance of hypertension. Six other cases of extrinsic compression of the renal artery have been found in the literature. Surgical treatment is mandatory in all cases because the mechanism that causes the lesion makes percutaneous transluminal angioplasty illusory. 相似文献
19.
Kimberly M Miller Michael S Okun Hubert F Fernandez Charles E Jacobson Ramon L Rodriguez Dawn Bowers 《Movement disorders》2007,22(5):666-672
Depression is common in Parkinson's disease (PD) and affects 30 to 50% of all patients. In contrast to the wealth of research on depression in PD, little is known about the occurrence of depression in other movement disorders. The primary objective of the current study was to determine whether the high prevalence of depression symptoms seen in PD is also found in other movement disorders, by directly comparing rates of specific depression symptoms and depression severity across PD, dystonia, and essential tremor (ET). Three hundred and fifty-four patients with PD, 83 patients with dystonia, and 53 patients with ET completed the Beck Depression Inventory (BDI). We found no significant between-groups differences for depression severity, frequency, or endorsement of specific depression symptoms. Forty-eight percent of PD patients, 37.3% of dystonia patients, and 34% of ET patients were found to be at least mildly depressed (BDI score of 10 or higher). The most commonly endorsed symptoms were fatigability, difficulty with work, anhedonia, and sleep disturbance. Clinicians should be aware that depression is a frequent problem in dystonia and ET, in addition to PD, and inquire about depression symptoms in these patients so that they can be appropriately treated. 相似文献
20.
A Küster P Jouvet D Bonnet C Flandin R Lenclein P Hubert D Jan 《Zeitschrift für Kinderchirurgie》2003,13(5):294-297
Twenty-two premature neonates underwent surgical haemoclip closure of patent ductus arteriosus in a neonatal intensive care unit (NICU). Surgery was performed in the NICU in order to prevent hypothermia and interruption of care, and to avoid accidental vascular access removal and extubation. The results suggest that morbidity can be limited by performing the surgery in an NICU, and by switching from conventional to high-frequency mechanical ventilation in case of severe respiratory failure. 相似文献