全文获取类型
收费全文 | 12773篇 |
免费 | 947篇 |
国内免费 | 68篇 |
专业分类
耳鼻咽喉 | 287篇 |
儿科学 | 253篇 |
妇产科学 | 216篇 |
基础医学 | 1932篇 |
口腔科学 | 293篇 |
临床医学 | 1219篇 |
内科学 | 2763篇 |
皮肤病学 | 311篇 |
神经病学 | 1223篇 |
特种医学 | 788篇 |
外国民族医学 | 3篇 |
外科学 | 1720篇 |
综合类 | 145篇 |
一般理论 | 4篇 |
预防医学 | 835篇 |
眼科学 | 94篇 |
药学 | 895篇 |
中国医学 | 11篇 |
肿瘤学 | 796篇 |
出版年
2023年 | 49篇 |
2022年 | 126篇 |
2021年 | 247篇 |
2020年 | 127篇 |
2019年 | 206篇 |
2018年 | 255篇 |
2017年 | 208篇 |
2016年 | 282篇 |
2015年 | 369篇 |
2014年 | 410篇 |
2013年 | 532篇 |
2012年 | 870篇 |
2011年 | 912篇 |
2010年 | 500篇 |
2009年 | 479篇 |
2008年 | 842篇 |
2007年 | 886篇 |
2006年 | 804篇 |
2005年 | 833篇 |
2004年 | 799篇 |
2003年 | 775篇 |
2002年 | 687篇 |
2001年 | 156篇 |
2000年 | 123篇 |
1999年 | 166篇 |
1998年 | 156篇 |
1997年 | 171篇 |
1996年 | 126篇 |
1995年 | 117篇 |
1994年 | 103篇 |
1993年 | 103篇 |
1992年 | 84篇 |
1991年 | 79篇 |
1990年 | 66篇 |
1989年 | 81篇 |
1988年 | 54篇 |
1987年 | 56篇 |
1986年 | 69篇 |
1985年 | 50篇 |
1984年 | 67篇 |
1983年 | 58篇 |
1982年 | 74篇 |
1981年 | 58篇 |
1980年 | 60篇 |
1979年 | 49篇 |
1978年 | 37篇 |
1977年 | 35篇 |
1975年 | 41篇 |
1974年 | 34篇 |
1972年 | 31篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
111.
Starkus JG Varga Z Schönherr R Heinemann SH 《Pflügers Archiv : European journal of physiology》2003,447(1):44-54
Potassium channels are regulated by protons in various ways and, in most cases, acidification results in potassium current reduction. To elucidate the mechanisms of proton-channel interactions we investigated N-terminally truncated Shaker potassium channels (Kv1 channels) expressed in Xenopus oocytes, varying pH at the intracellular and the extracellular face of the membrane. Intracellular acidification resulted in rapid and reversible channel block. The block was half-maximal at pH 6.48, thus even physiological excursions of intracellular pH will have an impact on K+ current. The block displayed only very weak voltage dependence and C-type inactivation and activation were not affected. Extracellular acidification (up to pH 4) did not block the channel, indicating that protons are effectively excluded from the selectivity filter. Channel current, however, was reduced greatly due to marked acceleration of C-type inactivation at low pH. In contrast, inactivation was not affected in the T449V mutant channel, in which C-type inactivation is impaired. The pH effect on inactivation of the wild-type channel had an apparent pK of 4.7, suggesting that protonation of extracellular acidic residues in Kv channels makes them subject to pH regulation. 相似文献
112.
Nguyen Khac F Waill MC Romana SP Radford-Weiss I Busson M Collonge-Rame MA Ribadeau-Dumas A Piffaut MC Daniel MT Davi F Merle-Béral H Berger R Arock M 《Cancer Genetics and Cytogenetics》2002,138(1):22-26
Two patients with Ph-positive chronic myelocytic leukemia in erythroblastic transformation and rearrangement of the short arm of chromosome 18 are reported. Fluorescence in situ hybridization studies showed that the 18p rearrangement resulted from translocation of the main part of chromosome 22 long arm to 18p, including BCR-ABL1 fusion. The 18p abnormality resulted, thus, in loss of 18p and duplication of BCR-ABL1 in both patients. The possible relation to the erythroblastic type of blastic phase is briefly discussed. In addition an apparently intact germline ABL1 gene was duplicated and inserted into chromosome 6 at band p21 in one of these patients. 相似文献
113.
114.
Wuyts W Roland D Lüdecke HJ Wauters J Foulon M Van Hul W Van Maldergem L 《American journal of medical genetics》2002,113(4):326-332
Multiple exostoses represent a genetically heterogeneous disorder that may occur isolated or as part of a complex contiguous gene syndrome such as Langer-Giedion syndrome on chromosome 8 and the proximal 11p deletion syndrome on chromosome 11. Here we describe a boy with multiple exostoses, hypertrichosis, mental retardation, and epilepsy due to a de novo deletion on chromosome 8q24. Molecular analysis revealed that the deletion interval overlaps with the Langer-Giedion syndrome and involves the EXT1 gene and additional genes located distal to EXT1, but probably not encompassing the TRPS1 gene located proximal to EXT1. 相似文献
115.
Interaction of B7RP-1 with ICOS Negatively Regulates Antigen Presentation by B Cells 总被引:1,自引:0,他引:1
Stimulation of T cells through the T cell receptor is insufficient for optimal T cell activation. A second activation signal is necessary, being usually provided by the costimulatory molecule CD28. Recently, additional costimulatory pathways have been identified, including inducible costimulator (ICOS) and its ligand B7RP-1. We have examined the role of the B7RP-1/ICOS costimulatory pathway on antigen presentation by B cells, using the I-Ak and I-Ek-positive CH27 B cell line and several different T cell lines. We found that CH27 expressed B7RP-1 and PD-L1 whereas the T cell lines expressed ICOS and PD-1. In the presence of HEL, the T cell hybridomas C10 and 3A9 released IL-2, which is indicative of antigen-specific T cell activation by the CH27 cells. Unexpectedly, blocking antibodies for B7RP-1 and ICOS enhanced the IL-2 response in both T cells. As expected, an increase in the production of IL-2 was seen when blocking antibodies for PD-1 were used. Blocking with antibodies for I-Ak, CD28, B7.1, and B7.2 lead to a decrease in IL-2 production. Additionally we tested a Th1 and a Th2 T cell clone. Blockade of B7RP-1/ICOS lead to an increased IFN- response in Th1 cells (A.E7) and an increased IL-4 response in Th2 cells (D10.G4.1). Intracellular staining also showed an increase in cytokine production when the B7RP-1/ICOS pathway was blocked. In conclusion, the B7RP-1/ICOS pathway is negatively regulating T cell activation by B cells and may play a role similar to that of the PD-L1/PD-1 pathway. 相似文献
116.
Fluorescence in situ hybridization analysis was carried out in five patients with acute myeloblastic leukemia of various French-American-British subtypes and with double trisomy of chromosomes 8 and 21. PML-RARA fusion was detected with appropriate molecular probes in one patient with acute promyelocytic leukemia without t(15;17). Two PAC probes covering the 5' and 3' part of the RUNX1 gene were used in the four other patients. While three copies were present in three patients, as expected from conventional karyotype analysis, only two hybridization signals were present in the fifth patient. This was due to the apparent loss of the 3' part of RUNX1. Since chromosome number abnormalities may be associated with submicroscopic gene rearrangements, it should be important to search for them for a better understanding of mechanisms of leukemogenesis, and to understand the prognostic heterogeneity in leukemic patients with aneusomies without apparent chromosome structure rearrangements. 相似文献
117.
CD34(+) fibrocytes in normal cervical stroma,cervical intraepithelial neoplasia III,and invasive squamous cell carcinoma of the cervix uteri 总被引:3,自引:0,他引:3
Barth PJ Ramaswamy A Moll R 《Virchows Archiv : an international journal of pathology》2002,441(6):564-568
CD34(+) fibrocytes are widely distributed in normal connective tissues but have been reported to be absent within the stroma associated with invasive carcinomas. In the present study we investigated the presence and distribution of CD34(+) fibrocytes and alpha-smooth muscle actin (alpha-SMA) positive myofibroblasts in cervical intraepithelial neoplasia III (CIN III; n=8), invasive carcinoma of the cervix ( n=18) and adjacent normal cervical stroma. Normal cervical stroma and the stroma adjacent to CIN III disclosed a dense network of CD34(+) fibrocytes, whereas the stroma of invasive carcinoma was virtually free of this cell population. Early stromal invasion by squamous carcinoma was characterized by a focal loss of CD34(+) fibrocytes. alpha-SMA-positive myofibroblasts were not seen in the normal cervical stroma but occurred in six of eight cases of CIN III adjacent to the atypical epithelium. The stroma of invasive carcinoma was made up of large amounts of haphazardly arranged alpha-SMA-positive myofibroblasts. In the setting of the present study, a loss of CD34(+) fibrocytes was specific for stromal alterations associated with invasive carcinoma and proved to be a sensitive tool in detecting small foci of stromal invasion. Therefore, detection of a loss of CD34(+) fibrocytes may constitute an adjunctive tool in detecting (1) early stromal invasion and (2) invasive carcinoma in small biopsy specimens. Moreover, the present study shows that CD34(+) fibrocytes and myofibroblasts play an important role in stromal remodeling associated with invasive squamous cell carcinoma of the cervix. 相似文献
118.
Thierry Janssen MD Michel Petein MD Roland van Velthoven MD Patrick van Leer MD Marc Fourmarier MD Juan-Pablo Vanegas MD Andre Danguy PhD Claude Schulman MD Jean-Lambert Pasteels MD Robert Kiss PhD 《Human pathology》1996,27(12):1341-1347
The histochemical binding pattern of the peanut (Arachis hypogaea) lectin (PNA) was quantitatively described by means of computer-assisted microscope analysis in 28 benign prostatic hyperplasias (BPH), 15 prostatic intraepithelial neoplasias (PIN), and 119 prostatic adenocarcinomas. PNA exhibits noninunune but selective binding to glycoproteins with β-D-galactosyl(1,3)-N-acetyl-D-galactosamine residues. We also investigated whether a relationship existed between the number of histochemical-related PNA acceptors and the histochemical prostate-specific antigen (PSA) stain intensity, and between the number of PNA receptors and DNA ploidy level. The results show that neoplastic prostate tissues and high-grade intraepithelial prostatic neoplasias (PIN2_3) exhibit a significantly higher number of PNA acceptors than benign prostatic hyperplasias and low (PIN1) grade prostatic intraepithelial neoplasias. A statistically significant correlation was observed between the number of histochemically related PNA acceptors and PSA immunostain intensity. Lastly, diploid prostatic tumors, whether benign or malignant, exhibited a significantly higher number of PNA acceptors than aneuploid ones. These results suggest that PNA acceptors play an important role in the biology of prostate tumors. 相似文献
119.
Roland Berger Josette Hillion Daniel Janvier Zhu Chen Annette Bussel 《Cancer Genetics and Cytogenetics》1993,70(2):125-126
A t(8;21)(q22;q22) without blood and bone marrow invasion by immature myeloid precursor cells occurred in a patient previously treated for polycythemia vera. The presence of a molecular rearrangement confirmed that the chromosomal abnormality was identical to that observed in acute leukemia with t(8;21). This case shows that the translocation, t(8;21), may occur in myelodysplasia and suggests that it can precede the appearance of overt leukemia. 相似文献
120.
Riazimand SH Brieger J Jacob R Welkoborsky HJ Mann WJ 《Cancer Genetics and Cytogenetics》2002,136(1):53-57
Esthesioneuroblastoma (ENB) are rare tumors originating from the olfactory epithelium of the superior nasal cavity. This lesion is morphologically closely related to Ewing sarcoma and other peripheral primitive neuroectodermal tumors (pPNET). The affiliation of ENB to the pPNET family is still under discussion. Only very limited and contradictory cytogenetic data are available on ENB and only one patient has been analyzed by comparative genomic hybridization (CGH), so far. In the present study, genomic imbalances of three ENB were analyzed by CGH to evaluate (1) a recurrent pattern of imbalances, and (2) its relation to the pPNET family. The CGH analysis of three ENB revealed multiple recurrent aberrations including DNA overrepresentations of chromosomal material of the entire chromosome 19, partial gains of the long arms of chromosomes 8, 15, and 22, and deletions of the entire long arm of chromosome 4. Beside these common aberrations, several single gains and losses occurred, that is, gains on 6p, 10q, 1p, 9q, and 13q. We confirmed the former observation of amplified genetic material on chromosome 8 and found several new, currently not described recurrent genetic aberrations distinct from those described for pPNET. Our findings give evidence that ENB is not part of the pPNET family. We suggest that the combined gain of genetic material on 15q, 22q, and chromosome 8 might be indicative for ENB. To verify our findings and to define prognosis-related aberrations, a larger number of cases needs to be studied. 相似文献