全文获取类型
收费全文 | 13571篇 |
免费 | 898篇 |
国内免费 | 221篇 |
专业分类
耳鼻咽喉 | 209篇 |
儿科学 | 195篇 |
妇产科学 | 141篇 |
基础医学 | 2095篇 |
口腔科学 | 369篇 |
临床医学 | 1166篇 |
内科学 | 2746篇 |
皮肤病学 | 338篇 |
神经病学 | 778篇 |
特种医学 | 907篇 |
外国民族医学 | 2篇 |
外科学 | 1934篇 |
综合类 | 163篇 |
预防医学 | 767篇 |
眼科学 | 327篇 |
药学 | 1281篇 |
1篇 | |
中国医学 | 242篇 |
肿瘤学 | 1029篇 |
出版年
2024年 | 12篇 |
2023年 | 130篇 |
2022年 | 412篇 |
2021年 | 574篇 |
2020年 | 278篇 |
2019年 | 381篇 |
2018年 | 445篇 |
2017年 | 332篇 |
2016年 | 504篇 |
2015年 | 679篇 |
2014年 | 791篇 |
2013年 | 907篇 |
2012年 | 1347篇 |
2011年 | 1192篇 |
2010年 | 663篇 |
2009年 | 565篇 |
2008年 | 796篇 |
2007年 | 656篇 |
2006年 | 641篇 |
2005年 | 546篇 |
2004年 | 487篇 |
2003年 | 448篇 |
2002年 | 360篇 |
2001年 | 250篇 |
2000年 | 223篇 |
1999年 | 191篇 |
1998年 | 99篇 |
1997年 | 67篇 |
1996年 | 53篇 |
1995年 | 48篇 |
1994年 | 35篇 |
1993年 | 35篇 |
1992年 | 44篇 |
1991年 | 52篇 |
1990年 | 32篇 |
1989年 | 34篇 |
1988年 | 36篇 |
1987年 | 33篇 |
1986年 | 33篇 |
1985年 | 32篇 |
1984年 | 17篇 |
1983年 | 30篇 |
1982年 | 19篇 |
1981年 | 15篇 |
1980年 | 14篇 |
1979年 | 24篇 |
1978年 | 13篇 |
1976年 | 11篇 |
1975年 | 12篇 |
1970年 | 13篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
There is persuasive epidemiological and experimental evidence that dietary polyphenols have anti-inflammatory activity. Aspirin and other non-steroidal anti-inflammatory drugs (NSAIDs) have long been used to combat inflammation. Recently, cyclooxygenase (COX) inhibitors have been developed and recommended for treatment of rheumatoid arthritis (RA) and osteoarthritis (OA). However, two COX inhibitors have been withdrawn from the market due to unexpected side effects. Because conventional therapeutic and surgical approaches have not been able to fully control the incidence and outcome of many inflammatory diseases, there is an urgent need to find safer compounds and to develop mechanism-based approaches for the management of these diseases. Polyphenols are found in many dietary plant products, including fruits, vegetables, beverages, herbs, and spices. Several of these compounds have been found to inhibit the inflammation process as well as tumorigenesis in experimental animals; they can also exhibit potent biological properties. In addition, epidemiological studies have indicated that populations who consume foods rich in specific polyphenols have lower incidences of inflammatory disease. This paper provides an overview of the research approaches that can be used to unravel the biology and health effects of polyphenols. Polyphenols have diverse biological effects, however, this review will focus on some of the pivotal molecular targets that directly affect the inflammation process. 相似文献
62.
Jo EK Kumaki S Wei D Tsuchiya S Kanegane H Song CH Noh HY Kim YO Kim SY Chung HY Kim YH Kook H 《Journal of Korean medical science》2004,19(1):123-126
X-linked severe combined immunodeficiency (X-SCID) is a rare, life-threatening immune disorder, caused by mutations in the gamma c chain gene, which encodes an essential component of the cytokine receptors for interleukin-2 (IL-2), IL-4, IL-7, IL-9, IL-15, and IL-21. A 13-month-old boy with recurrent infections who had reduced serum immunoglobulin levels and decreased numbers of CD3, CD16/56 cells was evaluated for gamma c chain gene mutation and protein expression. The patient had a C-to-T point mutation at nucleotide position 690, one of the hot spots, resulting in a single amino acid substitution of cysteine for arginine (R226C), as determined by direct sequencing and PCR-RFLP. The patient's mother was a heterozygous carrier. Percutaneous umbilical cord blood sampling was performed at the 6-month of gestation in a subsequent pregnancy. As the immunophenotype of the fetus showed an identical pattern, the pregnancy was terminated and genetic analysis of the abortus confirmed recurrence. This is the first report of the molecular diagnosis of X-SCID in Korea. Genetic analysis of the gamma c chain gene is useful for definite diagnosis and genetic counseling for X-SCID. 相似文献
63.
New, sensitive rocket immunoelectrophoretic assay for measurement of the reaction between endotoxin and Limulus amoebocyte lysate. 总被引:9,自引:4,他引:9
L Baek 《Journal of clinical microbiology》1983,17(6):1013-1020
To study the active proteins which participate in the reaction of Limulus amoebocyte lysate (LAL) with lipopolysaccharide, antibody was raised in rabbits against LAL. When LAL was run against rabbit antiserum in crossed immunoelectrophoresis, a complex precipitin pattern appeared. Profound changes took place after reaction of LAL with lipopolysaccharide. The most distinct change was the complete disappearance of the cathodic migrating protein coagulogen, because the antigenicity of coagulogen was lost. Based on this observation, a new rocket immunoelectrophoretic method was developed to detect the disappearance of coagulogen after reaction of LAL with lipopolysaccharide. This assay method was used on clinical specimens (cerebrospinal fluid, plasma, ascites, and urine). It was used as a qualitative test, when a single sample is tested, or as a quantitative assay, when a number of sample dilutions were tested. The new method showed a higher degree of accuracy and sensitivity in comparison with the tube test and it can be used for both research and diagnostic purposes. 相似文献
64.
IL-15 is a potent T cell chemoattractant, and this cytokine and its unique α subunits, IL-15Rα, can modify immune cell expression of several T cell chemokines and their receptors. Facial nerve axotomy in mice leads to T cell migration across an intact blood–brain-barrier (BBB), and under certain conditions T cells can provide neuroprotection to injured neurons in the facial motor nucleus (FMN). Although chemokines and chemoattractant cytokines are thought to be responsible for T cell migration to the injured cell bodies, data addressing this question are lacking. This study tested the hypothesis that T cell homing to the axotomized FMN would be impaired in knockout (KO) mice with the IL-15 and IL-15Rα genes deleted, and sought to determine if microglial responsiveness and motoneuron death are affected. Both IL-15KO and IL-15RαKO mice exhibited a marked reduction in CD3+ T cells and had fewer MHC2+ activated microglia in the injured FMN than their respective WT controls at day 14 post-axotomy. Although there was a relative absence of T cell recruitment into the axotomized FMN in both knockout strains, IL-15RαKO mice had five times more motoneuron death (characterized by perineuronal microglial clusters engulfing dead motoneurons) than their WT controls, whereas dead neurons in IL-15KO did not differ from their WT controls. Further studies are needed to dissect the mechanisms that underlie these observations (e.g., central vs. peripheral immune contributions). 相似文献
65.
de Jong MD Bach VC Phan TQ Vo MH Tran TT Nguyen BH Beld M Le TP Truong HK Nguyen VV Tran TH Do QH Farrar J 《The New England journal of medicine》2005,352(7):686-691
In southern Vietnam, a four-year-old boy presented with severe diarrhea, followed by seizures, coma, and death. The cerebrospinal fluid contained 1 white cell per cubic millimeter, normal glucose levels, and increased levels of protein (0.81 g per liter). The diagnosis of avian influenza A (H5N1) was established by isolation of the virus from cerebrospinal fluid, fecal, throat, and serum specimens. The patient's nine-year-old sister had died from a similar syndrome two weeks earlier. In both siblings, the clinical diagnosis was acute encephalitis. Neither patient had respiratory symptoms at presentation. These cases suggest that the spectrum of influenza H5N1 is wider than previously thought. 相似文献
66.
4-1BB(CD137) is a member of the tumour necrosis factor receptor superfamily and is expressed on activated T cells, monocytes and natural killer (NK) cells. The interaction of 4-1BB and 4-1BB ligand provides a costimulatory signal leading to T-cell activation. The expression of 4-1BB has been known to be activation dependent. Interestingly, we found that expression of 4-1BB increased in human peripheral blood mononuclear cells after exposure to mitomycin C. Thus, we tested whether the treatment with other DNA-damaging agents, such as doxorubicin, bleomycin, and gamma-irradiation, could induce 4-1BB expression. The data indicated that 4-1BB expression increased dose-dependently by these agents reaching maximum at 2-3 days after the exposure. We found that the major 4-1BB-expressing population was CD3+ T cells, although a moderate number of CD14+ cells and a few NKB1+ cells also expressed 4-1BB. The levels of 4-1BB expression induced by anticancer drugs, were relatively lower than that induced by CD3 ligation. Interestingly, at subcytotoxic concentrations, doxorubicin and bleomycin considerably enhanced 4-1BB expression induced by CD3 ligation in CEM cells. The ligation of the damage-induced 4-1BB by monoclonal antibody enhanced the viability and proliferating capacity of the cells. In conclusion, the expression of 4-1BB might be one of the cellular responses of the immune cells against various genotoxic stresses. 相似文献
67.
Soo Hyun Kim Yang-Kyoo Han Young Ha Kim Sung Ill Hong 《Macromolecular chemistry and physics.》1992,193(7):1623-1631
L -Lactide was polymerized with stannous 2-ethylhexanoate (stannous octoate) in the presence of pentaerythritol to investigate multifunctional initiation. The prepared oligomers contain starshaped 4-arm molecules when the mole ratio of [lactide]/[pentaerythritol] is above 32. The molecular weight of oligomers coincides with the [lactide]/[pentaerythritol] ratio, indicating that pentaerythritol in conjugation with stannous octoate is an initiator for the “living” polymerization of L-lactide. 相似文献
68.
Ok-Sub Lee Byung-Jo Ha Soo-Nam Park Yoon-Sik Lee 《Macromolecular chemistry and physics.》1997,198(9):2971-2976
Chitosan/calcium-alginate beads were prepared by a coacervation method in aqueous medium. Their swelling properties and morphologies were studied. Complexed beads with a mean diameter of 500 μm were obtained by dropwise addition of a sodium alginate solution into a chitosan-calcium chloride solution. From scanning electron microscopic studies, we observed that chitosan modifies the morphology of calcium-alginate beads. The swelling properties of chitosan/calcium-alginate beads are different from those of calcium-alginate beads. In the case of the calcium-alginate beads, the swelling volume increases as the pH of the medium increases. However, chitosan/calcium-alginate beads show a maximum swelling volume at pH 9.0. 相似文献
69.
Jeong-Hyup Ha Seung-Jae Lee Myoung-Seon Gong 《Macromolecular chemistry and physics.》1995,196(12):4001-4010
Poly(enaminonitriles) containing flexible alkyl ether units were prepared by reacting p-bis(1-chloro-2,2-dicyanovinyl)benzene with various α,ω-bis(4-aminophenoxy)alkanes in N-methyl-2-pyrrolidone (NMP). All the polymers are soluble in polar aprotic solvents such as N,N-dimethylformamide (DMF), dimethyl sulfoxide (DMSO), N,N-dimethylacetamide (DMAc) and NMP as well as in common organic solvents such as tetrahydrofuran and acetone. High molecular weight polymers possessing inherent viscosities in the range of 0.82–1.20 dL/g were obtained and tough films were cast from a DMF solution. They showed a large exotherm around 340°C attributable to the chemical changes of the dicyanovinyl group. Thermogravimetric analyses exhibited a good thermal stability with a 10% weight loss around 450°C and 73–88% residual weight at 500°C under nitrogen. 相似文献
70.
Peer Arts Jessica Garland Alicia B. Byrne Tristan S.E. Hardy Milena Babic Jinghua Feng Paul Wang Thuong Ha Sarah L. King‐Smith Andreas W. Schreiber April Crawford Nick Manton Lynette Moore Christopher P. Barnett Hamish S. Scott 《American journal of medical genetics. Part A》2020,182(5):1273-1277
Autosomal dominant (de novo) mutations in PBX1 are known to cause congenital abnormalities of the kidney and urinary tract (CAKUT), with or without extra‐renal abnormalities. Using trio exome sequencing, we identified a PBX1 p.(Arg107Trp) mutation in a deceased one‐day‐old neonate presenting with CAKUT, asplenia, and severe bilateral diaphragmatic thinning and eventration. Further investigation by droplet digital PCR revealed that the mutation had occurred post‐zygotically in the father, with different variant allele frequencies of the mosaic PBX1 mutation in blood (10%) and sperm (20%). Interestingly, the father had subclinical hydronephrosis in childhood. With an expected recurrence risk of one in five, chorionic villus sampling and prenatal diagnosis for the PBX1 mutation identified recurrence in a subsequent pregnancy. The family opted to continue the pregnancy and the second affected sibling was stillborn at 35 weeks, presenting with similar severe bilateral diaphragmatic eventration, microsplenia, and complete sex reversal (46, XY female). This study highlights the importance of follow‐up studies for presumed de novo and low‐level mosaic variants and broadens the phenotypic spectrum of developmental abnormalities caused by PBX1 mutations. 相似文献