全文获取类型
收费全文 | 8121篇 |
免费 | 485篇 |
国内免费 | 35篇 |
专业分类
耳鼻咽喉 | 68篇 |
儿科学 | 282篇 |
妇产科学 | 192篇 |
基础医学 | 1245篇 |
口腔科学 | 173篇 |
临床医学 | 719篇 |
内科学 | 1683篇 |
皮肤病学 | 246篇 |
神经病学 | 860篇 |
特种医学 | 167篇 |
外科学 | 623篇 |
综合类 | 67篇 |
一般理论 | 3篇 |
预防医学 | 668篇 |
眼科学 | 185篇 |
药学 | 770篇 |
中国医学 | 11篇 |
肿瘤学 | 679篇 |
出版年
2024年 | 8篇 |
2023年 | 65篇 |
2022年 | 215篇 |
2021年 | 350篇 |
2020年 | 203篇 |
2019年 | 215篇 |
2018年 | 280篇 |
2017年 | 195篇 |
2016年 | 275篇 |
2015年 | 273篇 |
2014年 | 318篇 |
2013年 | 462篇 |
2012年 | 688篇 |
2011年 | 668篇 |
2010年 | 351篇 |
2009年 | 301篇 |
2008年 | 481篇 |
2007年 | 524篇 |
2006年 | 500篇 |
2005年 | 459篇 |
2004年 | 481篇 |
2003年 | 407篇 |
2002年 | 382篇 |
2001年 | 48篇 |
2000年 | 45篇 |
1999年 | 43篇 |
1998年 | 50篇 |
1997年 | 51篇 |
1996年 | 39篇 |
1995年 | 23篇 |
1994年 | 26篇 |
1993年 | 22篇 |
1992年 | 17篇 |
1991年 | 17篇 |
1990年 | 10篇 |
1989年 | 17篇 |
1988年 | 10篇 |
1987年 | 6篇 |
1986年 | 7篇 |
1985年 | 9篇 |
1984年 | 9篇 |
1983年 | 12篇 |
1982年 | 13篇 |
1981年 | 9篇 |
1980年 | 6篇 |
1978年 | 6篇 |
1977年 | 7篇 |
1976年 | 4篇 |
1975年 | 4篇 |
1974年 | 6篇 |
排序方式: 共有8641条查询结果,搜索用时 0 毫秒
31.
The biological reaction caused by oxygen-derived free radicals at the molecular and cellular levels involves many different biochemical components which can be directly damaged by oxidizing radicals. As such a reaction may lead to pathological processes, defence mechanisms have evolved to limit the rate of free radical production. These mechanisms employ low-molecular-weight non-enzymatic antioxidants and antioxidant enzymes which are inducible by oxidant stress. In this study, the activity of two antioxidant enzymes, superoxide dismutase (EC 1.15.1.1) and glutathione peroxidase (EC 1.11.1.9), and the level of non-enzymatic antioxidants (total antioxidant status) in the blood from mice infected with Trichinella spiralis was examined. We observed a statistically significant, up to above twofold increase (relative to the control value in uninfected mice) in the level of both enzymes as well as in the total antioxidant status. An intensification of antioxidant processes during trichinellosis could be related to the presence of T. spiralis larvae, which may induce phagocytes to generate free radicals. Our research shows that the maximum growth in antioxidant activity in the blood appears during the period of the greatest muscle damage caused by T. spiralis infection at 3–7 weeks post-infection. 相似文献
32.
The incidence of asthma and other allergic diseases continues to increase. In addition to genetic factors, environmental influences are thought to play an important role. The aim of this study was to identify factors that influence and drive the atopic march from atopic sensitization to asthma in children from Lód?. METHODS: 800 atopic children, aged 5-18 years, were included to our study. Parents filled in questionnaires and gave interviews about their children's diseases. 405 (43%) children have diagnosis of asthma. RESULTS: A significant association was observed between asthma and male sex, parents' history of atopy, parental highest school grade, maternal smoking during pregnancy, maternal chronic disease (especially chronic renal diseases), maternal allergen-sensitizing diet during breast-feeding, increased exposure to indoor humidity and moulds. Similar effect was seen for episodes of wheeze occurring in the first 3 years of life as followed: wheezing during an airway infection, wheezing not connected with respiratory tract infection, wheezing not related with physical exercise. Child's daycare attendance (nursery school) was associated with decreased risk of asthma. 相似文献
33.
The first and second internal transcribed spacers (ITS1, ITS2) as well as the intervening 5.8S coding region of the rRNA
gene were characterized in eight Babesia canis isolates of differing geographic origin, vector specificity, and pathogenicity to dogs. The genotypes determined by sequencing
segregated into three clearly separated groups close to or near the species level and correspond to the previously proposed
subspecies B. canis canis, B. canis vogeli, and B. canis rossi. The three genotypes can be distinguished by Sau96I digestion of the polymerase chain reaction (PCR)-amplified rDNA target.
Received: 12 December 1997 / Accepted: 5 January 1998 相似文献
34.
Robinson PN Booms P Katzke S Ladewig M Neumann L Palz M Pregla R Tiecke F Rosenberg T 《Human mutation》2002,20(3):153-161
The Marfan syndrome (MFS) is a pleiotropic, autosomal dominant disorder of connective tissue with highly variable clinical manifestations including aortic dilatation and dissection, ectopia lentis, and a series of skeletal anomalies. Mutations in the gene for fibrillin-1 (FBN1) cause MFS, and at least 337 mainly unique mutations have been published to date. FBN1 mutations have been found not only in MFS but also in a range of connective tissue disorders collectively termed fibrillinopathies ranging from mild phenotypes, such as isolated ectopia lentis, to severe disorders including neonatal MFS, which generally leads to death within the first two years of life. The present article intends to provide an overview of mutations found in MFS and related disorders and to discuss potential genotype-phenotype correlations in MFS. 相似文献
35.
Urs M Nater Elvira Abbruzzese Monika Krebs Ulrike Ehlert 《International journal of psychophysiology》2006,62(2):300-308
Although it is known that men and women differ in their music preferences and emotional reactions to music, little is known about sex differences in physiological reactions to music. In our study, we therefore set out to examine the differential reactivity to two musical stimuli that elicit distinct psychological and physiological reaction patterns. Fifty-three healthy subjects (mean age: 26.13, SD: 3.97; 26 males, 27 females) were examined. Heart rate, electrodermal activity, skin temperature, salivary cortisol, salivary alpha-amylase, and psychological variables were assessed during the course of the whole study. Following baseline assessment, two musical stimuli, which were carefully selected and rated in a pre-study as relaxing and pleasant (renaissance music) and arousing and unpleasant (heavy metal), respectively, were introduced. They were presented on two different days in a randomized order. Whereas psychological variables did not differ between men and women, results of electrophysiological measures indicate significantly different reactivity patterns between men and women. Women displayed elevated response curves to the arousing and unpleasant stimulus, whereas men did not. However, no differences were found with regards to endocrine measures in saliva. Our results demonstrate sex differences in reactivity patterns to musical stimuli in psychophysiological measures. In our study, we were able to show that women tend to show hypersensitivity to aversive musical stimuli. This finding is in accordance with previous literature on sex differences in emotion research. Furthermore, our study indicates that the confounding effects of sex differences have to be considered when using musical stimuli for emotion induction. 相似文献
36.
Ermert M Kuttner D Eisenhardt N Dierkes C Seeger W Ermert L 《Laboratory investigation; a journal of technical methods and pathology》2003,83(3):333-347
Mitogen-activated protein kinases (MAPKs) are part of an intracellular signaling machinery consisting of three known distinct pathways, each leading to activation of a different protein kinase: p38, ERK (extracellular signal-regulated kinase), or JNK (c-Jun N-terminal kinase). We investigated the role of the p38 MAPK pathway in the phenomenon of lung endotoxin "priming": incubation of perfused rat lungs with lipopolysaccharide (LPS) for 2 hours results in drastically enhanced cyclooxygenase-2-dependent and thromboxane synthase-dependent vasoconstriction and bronchoconstriction, including edema formation in response to a second inflammatory stimulus, such as arachidonic acid application. Two unrelated selective inhibitors of p38 (SB203580 and SC-68376) dose dependently suppressed the arachidonic acid-induced pulmonary artery pressor response, edema formation, and bronchoconstrictor response in both control lungs and lungs that underwent preceding endotoxin priming. In parallel, thromboxane, but not prostacyclin, released into the lung perfusate was dose dependently inhibited. Using immunohistochemical techniques in combination with quantitative microdensitometry, p38 was detected in nearly all cell types in control lungs, whereas the activated form p-p38 was only expressed in certain cell types, eg, bronchial epithelial cells, endothelial cells, alveolar macrophages, and vascular smooth muscle cells (SMC) of small vessels. In response to endotoxin, p-p38 expression was additionally observed in septal cells, bronchial SMC, and vascular SMC of larger pulmonary vessels and was increased in most other cell types including small-vessel SMC. We conclude that both immunolocalization of p38 activity and pharmacologic interventions support a strong role of the p38 MAPK pathway in establishing an active cyclooxygenase-2/thromboxane synthase axis in vascular and bronchial SMC, with up-regulation of this signaling cascade occurring in LPS priming and being responsible for enhanced pulmonary artery pressor response, edema formation, and bronchoconstriction. Moreover, LPS induces or increases phosphorylation of p38 in other lung cell types. The physiologic consequences of these events remain to be established. 相似文献
37.
Monika Johann Albert Putzhammer Peter Eichhammer Norbert Wodarz 《American journal of medical genetics. Part B, Neuropsychiatric genetics》2005,(1):46-49
Several lines of evidence indicate an involvement of the dopaminergic system in alcoholism, withdrawal, suicidality, and attention-deficit hyperactivity disorder (ADHD). The functionally relevant -141C Ins/Del polymorphism located upstream to exon 1 in the 5'-region of the dopamine D2 receptor (DRD2) gene might be an interesting candidate gene. We investigated a sample of 1,126 well-characterized, primary chronic alcoholics of German descent according to a phenotype-genotype strategy, i.e., alcoholics suffering from severe withdrawal complications such as seizure or delirium, family history positive (FH+) alcoholics, alcoholics with an antisocial personality disorder (ASPD), alcoholics with an ADHD, and type 1 or type 2 alcoholics according to Cloninger's typology. Compared to the control subjects, there was a significant excess of the -141C Del allele in alcoholics with a paternal and grandpaternal history of alcoholism and in alcoholic subgroups with suicidality or without a history of withdrawal symptoms. There were no significant differences in allele frequency between the entire group or subgroups of alcoholics and healthy controls. Therefore, the -141C Del variant of the DRD2 might be a protective factor against the development of withdrawal symptoms. However, it might also be a risk factor in a highly burdened subgroup of alcoholics with a paternal and grandpaternal history of alcoholism and it might contribute to the substantially higher likelihood of suicide in alcoholics. 相似文献
38.
Warncke B Valtink M Weichel J Engelmann K Schäfer H 《Virchows Archiv : an international journal of pathology》2004,444(1):74-81
Transplantation of retinal pigment epithelial (RPE) cells is discussed as a possible therapeutic approach for retinal degeneration. Xenogeneic transplantation of human RPE cells in animal models has been studied extensively. Various methods have been used to identify the graft cells, but these methods interfere with cell behaviour so that the monitored physiological post-transplantation course may be influenced. In the present study, we applied a method for an unequivocal identification of the graft cells without interfering cell metabolism or behaviour using in situ hybridisation (ISH) of human specific Alu sequences. Visualisation of the strong extended nuclear signal of Alu sequences was much easier than that of the small nuclear signals of donor-specific sex chromosome probes. With Alu probe, even single graft cells can be identified and their development can be observed in short-term and long-term studies. With this procedure, we could prove that donor cells were injected correctly into the subretinal space by a special injection technique that we developed previously. In combination with immunohistochemistry, donor cells could be clearly discriminated from macrophages, which contained phagocytosed donor cell fragments. Application of these ISH methods for species-specific identification was valuable for follow-up-studies of RPE transplantation. 相似文献
39.
A silencing pathway to induce H3-K9 and H4-K20 trimethylation at constitutive heterochromatin 总被引:31,自引:1,他引:31
下载免费PDF全文
![点击此处可从《Genes & development》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Schotta G Lachner M Sarma K Ebert A Sengupta R Reuter G Reinberg D Jenuwein T 《Genes & development》2004,18(11):1251-1262
Histone lysine methylation is a central modification to mark functionally distinct chromatin regions. In particular, H3-K9 trimethylation has emerged as a hallmark of pericentric heterochromatin in mammals. Here we show that H4-K20 trimethylation is also focally enriched at pericentric heterochromatin. Intriguingly, H3-K9 trimethylation by the Suv39h HMTases is required for the induction of H4-K20 trimethylation, although the H4 Lys 20 position is not an intrinsic substrate for these enzymes. By using a candidate approach, we identified Suv4-20h1 and Suv4-20h2 as two novel SET domain HMTases that localize to pericentric heterochromatin and specifically act as nucleosomal H4-K20 trimethylating enzymes. Interaction of the Suv4-20h enzymes with HP1 isoforms suggests a sequential mechanism to establish H3-K9 and H4-K20 trimethylation at pericentric heterochromatin. Heterochromatic H4-K20 trimethylation is evolutionarily conserved, and in Drosophila, the Suv4-20 homolog is a novel PEV modifier to regulate position-effect variegation. Together, our data indicate a function for H4-K20 trimethylation in gene silencing and further suggest H3-K9 and H4-K20 trimethylation as important components of a repressive pathway that can index pericentric heterochromatin. 相似文献
40.
Drynda S Ringel B Kekow M Kühne C Drynda A Glocker MO Thiesen HJ Kekow J 《Pathology, research and practice》2004,200(2):165-171