全文获取类型
收费全文 | 705904篇 |
免费 | 48875篇 |
国内免费 | 1306篇 |
专业分类
耳鼻咽喉 | 9174篇 |
儿科学 | 23278篇 |
妇产科学 | 17607篇 |
基础医学 | 110394篇 |
口腔科学 | 19956篇 |
临床医学 | 63754篇 |
内科学 | 134308篇 |
皮肤病学 | 16171篇 |
神经病学 | 49447篇 |
特种医学 | 25739篇 |
外国民族医学 | 76篇 |
外科学 | 104507篇 |
综合类 | 14820篇 |
现状与发展 | 2篇 |
一般理论 | 160篇 |
预防医学 | 51400篇 |
眼科学 | 16319篇 |
药学 | 53946篇 |
3篇 | |
中国医学 | 2359篇 |
肿瘤学 | 42665篇 |
出版年
2019年 | 5433篇 |
2018年 | 7861篇 |
2017年 | 6108篇 |
2016年 | 6822篇 |
2015年 | 7549篇 |
2014年 | 10262篇 |
2013年 | 15383篇 |
2012年 | 20491篇 |
2011年 | 21481篇 |
2010年 | 12717篇 |
2009年 | 11928篇 |
2008年 | 19989篇 |
2007年 | 21508篇 |
2006年 | 21906篇 |
2005年 | 20438篇 |
2004年 | 19987篇 |
2003年 | 18939篇 |
2002年 | 18456篇 |
2001年 | 36335篇 |
2000年 | 36902篇 |
1999年 | 30384篇 |
1998年 | 7876篇 |
1997年 | 6666篇 |
1996年 | 6972篇 |
1995年 | 6627篇 |
1994年 | 6096篇 |
1993年 | 5589篇 |
1992年 | 22973篇 |
1991年 | 22927篇 |
1990年 | 22312篇 |
1989年 | 22076篇 |
1988年 | 20039篇 |
1987年 | 19422篇 |
1986年 | 18474篇 |
1985年 | 17320篇 |
1984年 | 12697篇 |
1983年 | 10742篇 |
1982年 | 5922篇 |
1979年 | 11522篇 |
1978年 | 8129篇 |
1977年 | 6835篇 |
1976年 | 6595篇 |
1975年 | 7268篇 |
1974年 | 8498篇 |
1973年 | 8141篇 |
1972年 | 7660篇 |
1971年 | 7127篇 |
1970年 | 6877篇 |
1969年 | 6307篇 |
1968年 | 5780篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
101.
A number of children who are admitted for inpatient psychiatric treatment have experienced significant trauma and abuse. It is important to evaluate them for the presence of a DD. The variety, complexity, and subtlety of the symptomatic presentation of childhood MPD makes differential diagnosis difficult, and it is probable that many cases have been missed in the past. Detailed historical information and extensive behavioral observations in a variety of settings can assist in establishing the diagnosis and in delineating areas for therapeutic intervention. Hospitalization may be necessary to conduct an adequate evaluation, develop a therapeutic alliance, safely manage behaviors that are injurious to the child or others, and/or to diffuse potentially volatile family situations. All members of a multidisciplinary inpatient team play important roles in the achievement of successful therapeutic intervention with dissociating children and their families. Skilled family therapy is often an important adjunct to therapeutic interventions focused on the child, particularly when the parent also has MPD. Knowledge of the psychodynamic issues involved in dissociation can be used to develop behavioral interventions that are successful in decreasing the child's need to dissociate, improving his or her overall functioning, and help him or her gain mastery over problematic behaviors. 相似文献
102.
The Partial Report Span of Apprehension test has been found to detect cognitive deficits in some first degree relatives of schizophrenic patients. To assess the relative contribution of genetic vs. environmental factors on this measure, 19 monozygotic and 14 dizygotic female twin pairs, selected from a normal population, were tested on the Span of Apprehension test and an IQ test. Both Span of Apprehension test performance and IQ score had high heritabilities: 0.65 and 0.71, respectively. The mode of transmission for performance on the Span of Apprehension test appears to operate in a nonadditive manner. A multivariate behavioral-genetic model applied to the Span of Apprehension and IQ measures indicated that slightly less than half of the genetic effects important for the Span of Apprehension test are found in common with the genetic factors important for IQ. The phenotypic correlation between the Span of Apprehension and IQ measures can be attributed entirely to genetic factors. The influence of unique genetic components in the performance of the Span of Apprehension test in the general population heightens the promise of this measure as a genetic marker for schizophrenia. 相似文献
103.
Oncologic screenings of the populations in the areas with increased incidence of esophageal cancer have revealed Barrett's ulcer in 1 percent of the examinees. Endoscopic and cytologic characteristics of this condition are presented. Precancer changes--severe dysplasia--are most frequent in male Kazakhs (14.1 percent) aged 50 to 59 (14.7 percent). Subjects with Barrett's ulcer developing severe dysplasia, as evidenced by cytograms, should be included in the group of subjects at risk for carcinoma of the lower third of the esophagus and cardia. 相似文献
104.
In the period 1979-1980 the following anthropometric measurements were recorded in 2351 healthy Dutch children from 0-17 years of age: height, weight, sitting height, arm span, lengths of upper-arm, lower-arm and hand, tibial length, foot length, biacromial diameter, biiliacal diameter, and head circumference. Corresponding percentile values were constructed on the basis of normality assumptions, the mean and standard deviation at age t being determined by a cubic spline approximation. The results are compared with other studies and given in the form of growth charts. 相似文献
105.
106.
J. Saßmannshausen N. Bornfeld A. Kluge W. Sauerwein F. Härting A. Wessing 《International ophthalmology》1989,13(4):243-251
Advanced malignant melanomas of the uvea unsuited for an eye salvaging approach require enucleation of the tumor containing eye. A series of 68 patients is reported who underwent enucleation combined with insertion of a spherical dura-encased implant after 30 Gray pre-irridiation therapy of the orbit. Postoperative results with special attention to cosmetic outcome and motility of the prosthesis suggest that the insertion of an orbital implant should be preferred to the enucleation with no implant. 相似文献
107.
M K Song W Y Shin N F Adham N V Costea 《The American journal of clinical nutrition》1989,49(4):701-707
The effects of different amounts of dietary zinc on the Zn absorption rate and on Zn, calcium and magnesium concentrations in tissues of MOPC 104E tumor-bearing Balb/c mice were determined. The Zn absorption rate was inversely related to the amounts of Zn in their diets and was lower than that of nontumor-bearing control mice fed a laboratory mice chow. Zn concentrations of tumor-bearing mice were also low compared with control mice but tumor Zn concentrations, regardless of the concentrations of Zn in the diets, were higher than those of normal tissues of the host other than the pancreas. Ca concentrations in tumor and tissues of tumor-bearing mice were higher than in control animals but Mg concentrations in tissues of tumor-bearing mice appeared to be similar to those of control mice. Results suggest that tumor-bearing mice have a lower intestinal Zn absorption capacity and a higher Zn uptake rate causing other tissues to become hypozincemic and hypercalcemic. 相似文献
108.
A long-term clinical and therapeutic study was performed in 47 patients with mesangial IgA glomerulonephritis. The male to
female ratio was 2.9∶1. An episode of gross haematuria or the incidental discovery of asymptomatic microscopic haematuria
with associated mild proteinuria heralded the apparent onset of renal disease. At the onset of observation 18 patients (38.2%)
had high blood pressure. Other 17 patients developed hypertension during observation. Anaemia was uncommon. No essential abnormalities
in serum protein and lipid patterns were found. Twenty-nine patients (61.6%) had higher levels of serum immunoglobulins—most
frequently of IgA (42.5%). Twenty-two patients had low serum C3 levels (46.8%). The percentage of patients with renal failure increased from 21.2 to 36.1 during observation. Male sex, hypertension,
proteinuria higher than 2 g/24 h, elevated ESR, high serum IgA levels, longer duration of the disease and older age of patients
suggest an unfavourable outcome. Long-term treatment with a combination of azathioprine/acenocumarol, or indomethacin, or
levamisole has no effect on the clinical manifestation and evolution. 相似文献
109.
110.
4-Aminopyridine affects synaptosomal protein phosphorylation in rat hippocampal slices 总被引:2,自引:0,他引:2
Rat brain hippocampal slices were incubated with or without the convulsant 4-aminopyridine (4-AP). From these slices a crude mitochondrial/synaptosomal membrane fraction was prepared and analyzed for endogenous protein phosphorylation. 4-AP (10(-5) M) stimulated the phosphorylation of a 50 kDa protein by 86%. The phosphorylation of this 50 kDa protein is Ca2+/calmodulin-dependent and we suggest that this protein is the lower molecular weight subunit of Ca2+/calmodulin-dependent protein kinase II (CaMK II). 相似文献