全文获取类型
收费全文 | 49401篇 |
免费 | 4915篇 |
国内免费 | 1523篇 |
专业分类
耳鼻咽喉 | 266篇 |
儿科学 | 1741篇 |
妇产科学 | 405篇 |
基础医学 | 6561篇 |
口腔科学 | 1379篇 |
临床医学 | 5201篇 |
内科学 | 10670篇 |
皮肤病学 | 1329篇 |
神经病学 | 2536篇 |
特种医学 | 862篇 |
外国民族医学 | 5篇 |
外科学 | 3674篇 |
综合类 | 7679篇 |
现状与发展 | 4篇 |
一般理论 | 1篇 |
预防医学 | 3299篇 |
眼科学 | 840篇 |
药学 | 4680篇 |
30篇 | |
中国医学 | 3293篇 |
肿瘤学 | 1384篇 |
出版年
2024年 | 260篇 |
2023年 | 1047篇 |
2022年 | 1675篇 |
2021年 | 2374篇 |
2020年 | 2259篇 |
2019年 | 1954篇 |
2018年 | 1870篇 |
2017年 | 2067篇 |
2016年 | 2164篇 |
2015年 | 1966篇 |
2014年 | 3499篇 |
2013年 | 3859篇 |
2012年 | 3505篇 |
2011年 | 3580篇 |
2010年 | 2741篇 |
2009年 | 2603篇 |
2008年 | 2437篇 |
2007年 | 2189篇 |
2006年 | 1943篇 |
2005年 | 1702篇 |
2004年 | 1368篇 |
2003年 | 1139篇 |
2002年 | 993篇 |
2001年 | 878篇 |
2000年 | 682篇 |
1999年 | 595篇 |
1998年 | 577篇 |
1997年 | 448篇 |
1996年 | 459篇 |
1995年 | 349篇 |
1994年 | 317篇 |
1993年 | 280篇 |
1992年 | 280篇 |
1991年 | 224篇 |
1990年 | 190篇 |
1989年 | 161篇 |
1988年 | 147篇 |
1987年 | 141篇 |
1986年 | 124篇 |
1985年 | 147篇 |
1984年 | 125篇 |
1983年 | 88篇 |
1982年 | 92篇 |
1981年 | 78篇 |
1980年 | 62篇 |
1979年 | 44篇 |
1978年 | 39篇 |
1977年 | 36篇 |
1976年 | 34篇 |
1974年 | 12篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
It has recently been shown that it is possible to discriminate accurately among myoelectric signals underlying different muscle
contraction types, specifically elbow flexion and extension and forearm pronation and supination. It was reported that once
a number of distinctive features had been extracted from the myoelectric signals, a neural network could be trained to distinguish
the contraction types with an impressively high accuracy. In the present paper, we show that a technique known as parallel
cascade identification can be used to construct classifiers that can also accurately, differentiate the contraction types.
The use of parallel cascades has the benefit of dispensing with the need for feature extraction, so that raw myoelectric signal
data can be used directly. In addition, very little data are required to train the parallel cascades to distinguish accurately
novel incoming myoelectric signals. Results of using parallel cascades to distinguish foream pronation, supination, and elbow
flexion are presented. 相似文献
52.
Emilio Bombardieri Antonia Martinetti Rosalba Miceli Luigi Mariani Maria Rita Castellani Ettore Seregni 《European journal of nuclear medicine and molecular imaging》1997,24(11):1349-1355
Bone scintigraphy plays a major role in the diagnosis of bone metastases. The clinical utility of new biochemical markers
of bone metabolism has recently been investigated in various bone diseases. This study evaluated the role of some bone metabolism
markers in comparison with bone scan in the follow-up of breast cancer patients. We studied 149 patients with breast cancer,
33 (22%) of whom had bone metastases. IRMAs were used for the evaluation of blood levels of osteocalcin, bone alkaline phosphatase
(BAP), the C-terminal propeptide of type I procollagen and the C-terminal cross-linked telopeptide of type I collagen (ICTP).
Multivariate regression analysis showed that menopausal status (P=0.007) and metastatic bone lesions (P=0.001) affected bone marker levels. When considering post-menopausal women, the only subset in which bone metabolism marker
behaviour could be reliably investigated, we found a high degree of overlap in marker distribution for scan-positive and scan-negative
patients. Discrimination between scan-negative and scan-positive patients based on the above markers, taken singly or jointly,
was assessed by means of logistic discriminant analysis. The best discrimination was achieved with BAP, closely followed by
ICTP. BAP and ICTP together gave a slight improvement over the use of the two markers separately. However, even in this case
the degree of discrimination was poor and its clinical utility was limited. In fact, to achieve a specificity of 95%, the
sensitivity of the test was about 20%; conversely, with a sensitivity of 95%, the specificity was below 10%. In conclusion,
based on our findings, we believe that blood levels of the investigated markers cannot replace bone scintigraphy in the follow-up
of breast cancer patients for the early detection of bone metastases.
Received 14 April and in revised form 5 July 1997 相似文献
53.
54.
本文用胶固素酶联免疫吸附试验检测了16例缺血性脑血管病(ICD)患者,14例出血性脑血管病(HCD)患者和20例健康正常人的血清IgE型循环免疫复合物(CID)水平。结果显示ICD组和HCD组IgE-CIC水平明显高于正常组(分别为P<0.001和P<0.05)。ICD组与HCD组间没有显著差异(P>0.02)。提示脑血管病的发生与IgE-CIC的形成有关。 相似文献
55.
J. M. Greally L. Y. Boone S. G. Lenkey S. L. Wenger M. W. Steele 《American journal of medical genetics. Part A》1992,44(3):334-339
A child with manifestations of acrogeria and metageria, two “premature aging” syndromes, is presented. Because of his indistinct phenotype and because the question has been previously raised as to whether these conditions are separate, we propose the designation of acrometageria to describe this phenotypic continuum. As there is much in common clinically between acrometageria and the syndrome of type III procollagen deficiency (Ehlers-Danlos type IV), it might be presumed that a similar pathogenesis for acrometageria exists. This possibility has been tested previously, without demonstrating specific quantitative or qualitative deficits, but with some indirect evidence that collagen metabolism is deranged in these patients. One such crude indicator is the elevation of urinary hyaluronic acid levels, demonstrated in our patient and also observed in the phenotypically distinct Werner and Hutchinson-Gilford premature aging syndromes. On one hand, it could be argued that this supports the concept that premature aging syndromes exist as a biological continuum. On the other hand, it is equally valid to argue that syndromes of premature aging are so described merely because they include recognizable changes of normal aging and that the demonstration of an underlying mutation in a collagen gene, for example, invalidates their study as models of accelerated normal aging. © Wiley-Liss, Inc. 相似文献
56.
Hideto SAKAI Kiichiro JINDE Noboru SAOTOME Wei SUNG Mitsunori YAGAME Yasuo NOMOTO Masanobu MIYAZAKI Takashi HARADA 《Nephrology (Carlton, Vic.)》1997,3(1):91-94
Summary: In situ hybridization of mRNA for collagen IV, collagen VI, stromelysin (MMP-3) and TIMP1 was examined in renal biopsy specimens from patients with IgA nephropathy (IgAN) or diabetic nephropathy with various degrees of tissue damage. The majority of cells in the glomeruli expressed these mRNA almost simultaneously, but a few cells demonstrated positive expression for only one of these probes. There was a parallel relationship between the degree of tissue damage and that of mRNA expressions of these probes in patients with IgAN, while patients with diabetic nephropathy showed a reverse relationship between these two parameters. It is concluded that patients with mesangial proliferative glomerulonephritis expressed mRNA for collagen collagenase and its inhibitor in the glomeruli in parallel with the progress of tissue damage. In contrast, glomerular samples from patients with diabetic nephropathy showed that there was an inverse relationship between tissue damage and expression of mRNA. It is concluded that expression of collagen, collagenase and its inhibitor parallels the progression of glomerular changes in IgAN, but such parallel expression was not observed in patients with diabetic nephropathy. 相似文献
57.
本文动用自制t-PA单克隆抗体建立t-PA:Aa夹心ELISA法。结合t-PA:A、PAI:A测定,对50例正常人,87例肝病,47例冠心病和19例深静脉血栓 成患者的血浆t-PA:Ag、t-PA:A、PAI:A水平进行了研究。 相似文献
58.
Induction of type II collagen-specific antibody production in blood lymphocyte cultures of rhesus monkeys (Macaca mulatta) with collagen-induced arthritis using the immobilized native antigen. 下载免费PDF全文
Peripheral blood mononuclear cells (PBMC) from Rhesus monkeys previously immunized with bovine type II collagen to induce arthritis were cultured with the same antigen. Because the native protein is poorly soluble in culture medium a heating step is often used. The antigen in this form induced PBMC proliferation, but epitopes for the induction of antibody production and arthritis were lost. To keep the native protein intact it was coated on affigel beads. With the immobilized antigen specific antibody production could be induced. 相似文献
59.
Manolo Piccirilli Jacopo Lenzi Catia Delfinis Guido Trasimeni Maurizio Salvati Antonino Raco 《Child's nervous system》2006,22(10):1332-1337
Case reports The authors report their experience about three children (two girls, one boy; average age 1.6 years) with a spontaneous regression of optic gliomas. All of them had a previous diagnosis of neurofibromatosis type 1 (NF 1). None of them underwent surgery or biopsy nor received chemotherapy or radiotherapy. The complete regression was documented by MRI scans performed during a mean follow-up of 6.3 years.Literature review Moreover, the authors analyze the features of the 16 cases previously reported in English literature of spontaneously regressed optic gliomas with an overview of the different therapeutic strategies. The knowledge that this kind of tumor, particularly in young patients, may regress is important in the decision of the best therapeutic approach. 相似文献
60.
Jasper E Visser Bastiaan R Bloem Bart P C van de Warrenburg 《Movement disorders》2007,22(7):1024-1026
Progressive myoclonic ataxia, also referred to as Ramsay Hunt syndrome, is characterized by a combination of myoclonus and cerebellar ataxia, infrequently accompanied by tonic-clonic seizures. Its differential diagnosis overlaps with progressive myoclonic epilepsy, a syndrome with myoclonus, tonic-clonic seizures, progressive ataxia and dementia. In patients with progressive myoclonic epilepsy, specific diseases can frequently be recognized, but the diagnostic yield in progressive myoclonic ataxia is much lower. We describe a patient who presented with multifocal myoclonus in his thirties and who later developed cerebellar ataxia and focal dystonia. His father was similarly affected. Genetic studies revealed a mutation in the protein kinase C gamma (PRKCG) gene, known to cause spinocerebellar ataxia type 14 (SCA-14). This case illustrates that both myoclonus and dystonia are part of the clinical spectrum in SCA-14 and that myoclonus can even be the presenting symptom. We suggest that SCA-14 should be considered in the differential diagnosis of progressive myoclonic ataxia. 相似文献