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排序方式: 共有759条查询结果,搜索用时 46 毫秒
61.
Minematsu T Egashira N Kajiya H Takei M Takekoshi S Itoh Y Tsukamoto H Itoh J Sanno N Teramoto A Osamura RY 《Endocrine pathology》2007,18(1):8-15
The pituitary tumor-transforming gene (PTTG) is a homolog of yeast Securin, which arrests the activation of Separin to induce
sister chromatid separation in the transition from metaphase to anaphase. Pituitary tumor-transforming gene is also known
to induce angiogenesis during pituitary tumorigenesis. It has not been clarified whether PTTG functions as a cytoplasmic or
a nuclear protein. Our immunohistochemical study indicated that PTTG is localized in the cytoplasm of pituitary tumor cells.
In the present study, confocal laser scanning microscopy (CLSM) analysis of human pituitary adenomas and immunoelectron microscopy
of the mouse pituitary cell line, AtT-20, demonstrated the localization of PTTG in the Golgi apparatus and vesicles. Secreted
PTTG was detected by immunoblotting from culture medium of mouse pituitary tumor cell lines. Our results suggested that PTTG
is a secretory protein produced by pituitary tumor cells. In addition, PTTG may exert autocrine and/or paracrine functions
as a newly proposed important pathway for the action of PTTG. 相似文献
62.
Sasaki E Yatabe Y Hashimoto M Yamashita Y Hasegawa Y Kojima H Nagasawa T Mori N 《Pathology international》2007,57(2):53-59
In contrast to the clear oncogenic role of cyclins D1 and D2, cyclin D3 is suggested to have a role in the initiation and/or maintenance of differentiation in a lineage-associated manner in addition to its basic role in proliferation. Recently, it has been reported that in cyclin D3-deficient mice, normal expansion of T lymphocytes is impaired because of maturation arrest at the double-negative thymocyte stage, suggesting a crucial role for cyclin D3 in early T-cell development. Therefore, cyclin D3 expression was examined in 36 human precursor T-lymphoblastic leukemia/lymphomas (T-LBLL), a neoplastic counterpart of T cells at the early developmental stages of differentiation. Using a standard panel of differentiation markers, all T-LBLL were categorized into four stages according to differentiation: progenitor, double-negative, double-positive, and single-positive stages. Cyclin D3 expression was initiated at the boundary between double-negative and double-positive stages, and was sustained in the single-positive stage. T-cell receptor was expressed simultaneously with cyclin D3, whereas CD79a expression was specific in the double-negative stage, and thus it was inversely correlated with that of cyclin D3. Taken together with the crucial and non-redundant role in T-cell development in mice, this molecule is suggested to play an important role in human T-cell development. 相似文献
63.
The induced RNA‐binding protein,HuR, targets 3′‐UTR region of IL‐6 mRNA and enhances its stabilization in periodontitis 下载免费PDF全文
K. Ouhara S. Munenaga M. Kajiya K. Takeda S. Matsuda Y. Sato Y. Hamamoto T. Iwata S. Yamasaki K. Akutagawa N. Mizuno T. Fujita E. Sugiyama H. Kurihara 《Clinical and experimental immunology》2018,192(3):325-336
RNA‐binding proteins (RBPs) regulate mRNA stability by binding to the 3′‐untranslated region (UTR) region of mRNA. Human antigen‐R (HuR), one of the RBPs, is involved in the progression of diseases, such as rheumatoid arthritis, diabetes mellitus and some inflammatory diseases. Interleukin (IL)‐6 is a major inflammatory cytokine regulated by HuR binding to mRNA. Periodontal disease (PD) is also an inflammatory disease caused by elevations in IL‐6 following an infection by periodontopathogenic bacteria. The involvement of HuR in the progression of PD was assessed using in‐vitro and in‐vivo experiments. Immunohistochemistry of inflamed periodontal tissue showed strong staining of HuR in the epithelium and connective tissue. HuR mRNA and protein level was increased following stimulation with Porphyromonas gingivalis (Pg), one of the periodontopathogenic bacteria, lipopolysacchride (LPS)‐derived from Pg (PgLPS) and tumour necrosis factor (TNF)‐α in OBA‐9, an immortalized human gingival epithelial cell. The luciferase activity of 3′‐UTR of IL‐6 mRNA was increased by TNF‐α, Pg and PgLPS in OBA‐9. Luciferase activity was also increased in HuR‐over‐expressing OBA‐9 following a bacterial stimulation. Down‐regulation of HuR by siRNA resulted in a decrease in mRNA expression and production of IL‐6. In contrast, the over‐expression of HuR increased IL‐6 mRNA expression and production in OBA‐9. The HuR inhibitor, quercetin, suppressed Pg‐induced HuR mRNA expression and IL‐6 production in OBA‐9. An oral inoculation with quercetin also inhibited bone resorption in ligature‐induced periodontitis model mice as a result of down‐regulation of IL‐6. These results show that HuR modulates inflammatory responses by regulating IL‐6. 相似文献
64.
VEGF-A induces tumor and sentinel lymph node lymphangiogenesis and promotes lymphatic metastasis 总被引:33,自引:0,他引:33 下载免费PDF全文
Hirakawa S Kodama S Kunstfeld R Kajiya K Brown LF Detmar M 《The Journal of experimental medicine》2005,201(7):1089-1099
The mechanisms of tumor metastasis to the sentinel lymph nodes are poorly understood. Vascular endothelial growth factor (VEGF)-A plays a principle role in tumor progression and angiogenesis; however, its role in tumor-associated lymphangiogenesis and lymphatic metastasis has remained unclear. We created transgenic mice that overexpress VEGF-A and green fluorescent protein specifically in the skin, and subjected them to a standard chemically-induced skin carcinogenesis regimen. We found that VEGF-A not only strongly promotes multistep skin carcinogenesis, but also induces active proliferation of VEGF receptor-2-expressing tumor-associated lymphatic vessels as well as tumor metastasis to the sentinel and distant lymph nodes. The lymphangiogenic activity of VEGF-A-expressing tumor cells was maintained within metastasis-containing lymph nodes. The most surprising finding of our study was that even before metastasizing, VEGF-A-overexpressing primary tumors induced sentinel lymph node lymphangiogenesis. This suggests that primary tumors might begin preparing their future metastatic site by producing lymphangiogenic factors that mediate their efficient transport to sentinel lymph nodes. This newly identified mechanism of inducing lymph node lymphangiogenesis likely contributes to tumor metastasis, and therefore, represents a new therapeutic target for advanced cancer and/or for the prevention of metastasis. 相似文献
65.
66.
Simple self‐reported behavioral or psychological characteristics as risk factors for future type 2 diabetes in Japanese individuals: Toranomon Hospital Health Management Center Study 14 下载免费PDF全文
Yoriko Heianza Yasuji Arase Satoru Kodama Hiroshi Tsuji Kazuya Fujihara Kazumi Saito Shigeko Hara Hirohito Sone 《Journal of diabetes investigation.》2015,6(2):236-241
Aims/Introduction
Depression, anger, sleep disorders and cognitive impairment are regarded as presenting a high risk for diabetes. We investigated whether responses to single statements on a self-report questionnaire on the presence of each of these four factors were associated with the development of type 2 diabetes.Materials and Methods
We investigated 3,211 Japanese individuals without diabetes. Cumulative incidence rate and hazard ratios (HRs) for future type 2 diabetes over 7–13 years were evaluated according to the presence of lack of perseverance, anger, memory loss or sleep disorders.Results
Results of Cox regression analysis showed that lack of perseverance (age- and sex-adjusted HR 1.41, 95% confidence interval 1.07–1.84), anger, (HR 1.51, 95% confidence interval 1.07–2.12) or memory loss (HR 1.47, 95% confidence interval 1.14–1.90) was predictive of the development of diabetes. Even after adjustment for metabolic factors including glycemic measurements, anger was significantly associated with an increased risk of future diabetes. Individuals with both anger and memory loss had a 1.94-fold (95% confidence interval 1.19–3.15) increased risk of type 2 diabetes than those without those two symptoms.Conclusions
Responses to a simple self-report questionnaire as to whether individuals were aware of anger or memory loss were associated with the development of type 2 diabetes independent of traditional risk factors for diabetes in this cohort of Japanese individuals. 相似文献67.
Takashi Tsutsumi Hiroshi Kajiya Takashi Tsuzuki Kazuko T. Goto Koji Okabe Yutaka Takahashi 《Journal of prosthodontic research》2018,62(3):298-302
Purpose
Occlusal trauma, resulting in the destruction of alveolar bone, is a form of periodontal disease caused by excessive mechanical stress (MS) during hyperocclusion. Previously, we showed that CC chemokine ligand (CCL) 2/CCR2 receptor axis plays a crucial role in MS-dependent osteoclastogenesis. However, in the previous work, we were unable to precisely measure changes in alveolar bone profiles. In the present study, we sought to establish a precise method for evaluating alveolar bone resorption induced by hyperocclusion using micro-computed tomography.Methods
Under anesthesia, a stainless steel wire was attached to the molars of 5-week-old C57/BL6 wild-type (WT) mice, CCL2?/? mice, and CCR2?/?mice to induce occlusal force overload. At days 0 and 7, hard tissue samples were harvested and analyzed by micro-computed tomography.Results
In the WT mice, bone mineral density of the alveolar bone was significantly decreased at day 7 as compared with day 0, with marked alveolar bone resorption observed. Similarly, significant alveolar bone resorption was observed in the CCL2?/? and CCR2?/? mice at day 7 as compared with day 0.Conclusions
Micro-computed tomographic images can be used to measure changes in bone mineral density in a mouse model of hyperocclusion. This method may be useful for further investigating bone changes in other periodontal disease research fields. 相似文献68.
Masatoyo Nakajo Yoriko Kajiya Atsushi Tani Satoshi Yoneda Hiroshi Shirahama Michiyo Higashi Masayuki Nakajo 《European journal of radiology》2012
Purpose
To evaluate 18F-fluorodeoxyglucose (FDG) uptake to predict the malignant nature and analyze the correlation between FDG uptake and expression of glucose transporter 1 (Glut-1) and hexokinase II (HK-II) in thymic epithelial tumors.Materials and methods
Eleven patients with a thymic epithelial tumor who underwent FDG PET/CT before therapy were reviewed. The thymic tumors were classified by the WHO histological classification and Masaoka clinical staging. Comparison of maximum standardized uptake value (SUVmax) of the lesion was made between the low-risk (Type A, AB and B1) and high-risk {Type B2, B3 and C (thymic cancer)} groups and among clinical stages. Expression of Glut-1 and HK-II was analyzed immunohistochemically.Results
All 11 tumors showed FDG uptake visually. SUVmax was significantly higher in the high-risk group (n = 5, 5.24 ± 2.44) than the low-risk group (n = 6, 3.05 ± 0.55) (P = 0.008). Staining scores of both Glut-1 and HK-II were significantly higher in the high-risk group than in the low-risk group (Glut1: P = 0.034 and HK-II: P = 0.036). There were no significant differences in SUVmax (P = 0.11), Glut-1 (P = 0.35) and HK-II scores (P = 0.29) among clinical stages. SUVmax was significantly correlated to each of the staining scores of Glut-1 (ρ = 0.68, P = 0.031) and HK-II (ρ = 0.72, P = 0.024).Conclusion
These preliminary results support the previously published view that SUVmax may be useful to predict the malignant nature of thymic epitherial tumors and suggest that the degree of FDG uptake in the thymic epitherial tumors is closely related to the amount of Glut-1 and HK-II in the tumor. 相似文献69.
70.
G H Burgoyne K D Kajiya D W Brown J R Mitchell 《The Journal of infectious diseases》1985,152(1):204-210
The FRhL-2 cell line, a diploid line derived from the lung of a fetal rhesus monkey, was used to prepare a potent rabies vaccine by adapting the Kissling strain of rabies virus to FRhL-2 cells, growing the virus in quantity, inactivating the virus with beta-propiolactone, and concentrating the virus by adsorption to aluminum phosphate. High levels of antibody to rabies virus, induced by the vaccine in both guinea pigs and humans at 14 days after immunization, were determined to be IgG. Data from postexposure protocols with guinea pigs and simulated postexposure protocols in humans showed protection and antibody response even when rabies immune globulin was administered at the time of vaccination. 相似文献