全文获取类型
收费全文 | 199篇 |
免费 | 10篇 |
专业分类
耳鼻咽喉 | 1篇 |
儿科学 | 3篇 |
妇产科学 | 5篇 |
基础医学 | 49篇 |
口腔科学 | 13篇 |
临床医学 | 5篇 |
内科学 | 47篇 |
皮肤病学 | 3篇 |
神经病学 | 16篇 |
特种医学 | 5篇 |
外科学 | 27篇 |
综合类 | 6篇 |
预防医学 | 8篇 |
眼科学 | 9篇 |
药学 | 7篇 |
肿瘤学 | 5篇 |
出版年
2022年 | 2篇 |
2021年 | 2篇 |
2019年 | 2篇 |
2018年 | 2篇 |
2016年 | 7篇 |
2015年 | 3篇 |
2014年 | 4篇 |
2013年 | 11篇 |
2012年 | 2篇 |
2011年 | 3篇 |
2009年 | 4篇 |
2008年 | 2篇 |
2006年 | 2篇 |
2005年 | 2篇 |
2004年 | 3篇 |
2002年 | 10篇 |
2001年 | 6篇 |
2000年 | 10篇 |
1999年 | 6篇 |
1998年 | 3篇 |
1997年 | 20篇 |
1992年 | 5篇 |
1991年 | 10篇 |
1990年 | 5篇 |
1989年 | 6篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1985年 | 5篇 |
1984年 | 4篇 |
1983年 | 1篇 |
1982年 | 11篇 |
1981年 | 4篇 |
1980年 | 4篇 |
1979年 | 4篇 |
1978年 | 6篇 |
1977年 | 5篇 |
1976年 | 4篇 |
1975年 | 1篇 |
1974年 | 4篇 |
1973年 | 2篇 |
1972年 | 1篇 |
1971年 | 1篇 |
1967年 | 1篇 |
1964年 | 1篇 |
1963年 | 1篇 |
1962年 | 3篇 |
1957年 | 1篇 |
1956年 | 1篇 |
1932年 | 1篇 |
排序方式: 共有209条查询结果,搜索用时 328 毫秒
1.
2.
3.
Infectious full-length cDNA clones from the genomic RNAs of a subgroup II cucumber mosaic cucumovirus strain (Trk7) were obtained. Sequence analysis of the whole genome revealed strong homology (99%) to the genome of Q-CMV, the only subgroup II strain whose entire genomic nucleotide sequence had been available in the database, and an overall 75% homology to those of subgroup I strains. We provide sequence comparisons of different parts of 1a, 2a and 2b proteins of Cucumovirus species, and propose phylogenetic trees based on these protein sequences. 相似文献
4.
U. Sławin´ska F. Tyc˘ S. Kasicki R. Navarrete G. Vrbová 《Experimental brain research. Experimentelle Hirnforschung. Expérimentation cérébrale》1998,120(2):193-201
After partial denervation, the remaining motor units (MUs) of adult fast extensor digitorum longus muscle (EDL) expand their
peripheral field. The time course of this event was studied using tension measurement and recordings of electromyographic
(EMG) activity. The results show that after section of the L4 spinal nerve, when only 5.3 ± 0.63 of the 40 MUs normally supplying
EDL muscle remain, the force of individual motor units starts to increase between the 1st and 2nd week after the operation
and continues to do so for a further week. The drastic reduction of the number of motoneurones supplying the fast EDL leads
to an increase in activity of the remaining MUs. In the 1st week after partial denervation, there was a sharp increase in
the EMG activity of remaining motor units. During the next 12 days, this increase became less marked, but EMG activity remained
nevertheless significantly higher than that of the unoperated EDL muscle. Many MUs became tonically active during posture.
The EMG activity pattern during locomotion was also altered, so that the burst duration was positively correlated with the
step cycle duration. Moreover, shortly after partial denervation, the interlimb coordination was disturbed but returned to
its original symmetrical use 1–2 weeks later.
Received: 17 September 1996 / Accepted: 3 November 1997 相似文献
5.
D. S. Stokic´ W. Barry McKay Lillian Scott Arthur M. Sherwood Milan R. Dimitrijevic´ 《Experimental brain research. Experimentelle Hirnforschung. Expérimentation cérébrale》1997,117(3):437-443
The aim of the present study was to determine the characteristics of intracortical inhibition in the motor cortex areas representing
lower limb muscles using paired transcranial magnetic (TMS) and transcranial electrical stimulation (TES) in healthy subjects.
In the first paradigm (n=8), paired magnetic stimuli were delivered through a double cone coil and motor evoked potentials (MEPs) were recorded from
quadriceps (Q) and tibialis anterior (TA) muscles during relaxation. The conditioning stimulus strength was 5% of the maximum
stimulator output below the threshold MEP evoked during weak voluntary contraction of TA (33±5%). The test stimulus (67±2%)
was 10% of the stimulator output above the MEP threshold in the relaxed TA. Interstimulus intervals (ISIs) from 1–15 ms were
examined. Conditioned TA MEPs were significantly suppressed (P<0.01) at ISIs of less than 5 ms (relative amplitude from 20–50% of the control). TA MEPs tended to be only slightly facilitated
at 9-ms and 10-ms ISIs. The degree of MEP suppression was not different between right and left TA muscles despite the significant
difference in size of the control responses (P<0.001). Also, conditioned MEPs were not significantly different between Q and TA. The time course of TA MEP suppression,
using electrical test stimuli, was similar to that found using TMS. In the second paradigm (n=2), the suppression of TA MEPs at 2, 3, and 4 ms ISIs was examined at three conditioning intensities with the test stimulation
kept constant. For the pooled 2- to 4-ms ISI data, relative amplitudes were 34±6%, 61±5%, and 98±9% for conditioning intensities
of 0.95, 0.90, and 0.85× active threshold, respectively (P<0.01). In conclusion, the suppression of lower limb MEPs following paired TMS showed similar characteristics to the intracortical
inhibition previously described for the hand motor area.
Received: 21 June 1996 / Accepted: 23 May 1997 相似文献
6.
7.
Citera G Arias MA Maldonado-Cocco JA Lázaro MA Rosemffet MG Brusco LI Scheines EJ Cardinalli DP 《Clinical rheumatology》2000,19(1):9-13
The aim of the study was to determine the possible effect of melatonin treatment on disturbed sleep, fatigue and pain symptoms
observed in fibromyalgia (FM) patients. Twenty-one consecutive patients with FM were included in an open 4-week-duration pilot
study. Before and after treatment with melatonin 3 mg at bedtime, patients were evaluated using tender point count by palpation
of 18 classic anatomical regions, pain score in four predesignated areas, pain severity on a 10 cm visual analogue scale (VAS),
sleep disturbances, fatigue, depression, anxiety, and patient and physician global assessments, also by a VAS. Urine 6-sulphatoxymelatonin
levels (aMT-6S) were measured in the patients and 20 age- and sex-matched controls. Nineteen patients completed the study.
One patient withdrew because of migraine and another was lost to follow-up. At day 30, median values for the tender point
count and severity of pain at selected points, patient and physician global assessments and VAS for sleep significantly improved
with melatonin treatment. Other variables improved but did not reach statistical significance. Adverse events were mild and
transient. Lower levels of aMT-6S were found in FM patients compared with normal median controls (±SD, 9.16 ± 7.9 μg/24 h
vs 16.8 ± 12.8 μg/24 h) (p= 0.06). Although this is an open study, our preliminary results suggest that melatonin can be an alternative and safe treatment
for patients with FM. Double-blind placebo controlled studies are needed.
Received: 14 September 1998 / Accepted: 14 May 1999 相似文献
8.
S A Johnson P J Scanlon H S Loeb J M Moran R Pifarre R M Gunnar 《The American journal of medicine》1977,62(5):687-692
Thirty-seven patients in cardiogenic shock due to acute myocardial infarction were treated with intraaortic balloon counterpulsation and/or surgery. Eighteen of these patients were treated with counterpulsation alone; eight survived and five were in functional class I or II at the time of follow-up; two were in functional class III, and one was in functional class IV. Nineteen patients were treated surgically, eight survived and seven were in functional class I or II at the time of follow-up; one was in functional class III. Good functional recovery with counterpulsation alone is most common with inferior infarction. With surgery, functional recovery depends not only on the extent of the infarction and the coronary anatomy, but also on the ability to perform surgery within 12 hours of infarction or to support the patient with mechanical means for 10 to 14 days after the infarction and then perform surgery. 相似文献
9.
Inability of Turbidimetry Method in Detecting Glycated Hemoglobin to Select Diabetes Mellitus Patients According to Their Concentrations of Blood Glucose Levels 下载免费PDF全文
10.
Huespe Pablo Ezequiel Oggero Sebastian de Santibañes Martín Boldrini Gustavo D´Agostino Daniel Pekolj Juan de Santibañes Eduardo Ciardullo Miguel Hyon Sung Ho 《Cardiovascular and interventional radiology》2019,42(3):466-470
CardioVascular and Interventional Radiology - Biliary complications after living donor liver transplantation (LDLT) cause severe morbidity and mortality, with biliary anastomotic stricture being... 相似文献