全文获取类型
收费全文 | 6169篇 |
免费 | 309篇 |
国内免费 | 50篇 |
专业分类
耳鼻咽喉 | 45篇 |
儿科学 | 122篇 |
妇产科学 | 28篇 |
基础医学 | 699篇 |
口腔科学 | 149篇 |
临床医学 | 370篇 |
内科学 | 1671篇 |
皮肤病学 | 62篇 |
神经病学 | 375篇 |
特种医学 | 285篇 |
外科学 | 1064篇 |
综合类 | 39篇 |
预防医学 | 137篇 |
眼科学 | 257篇 |
药学 | 388篇 |
中国医学 | 7篇 |
肿瘤学 | 830篇 |
出版年
2024年 | 8篇 |
2023年 | 72篇 |
2022年 | 175篇 |
2021年 | 238篇 |
2020年 | 92篇 |
2019年 | 150篇 |
2018年 | 202篇 |
2017年 | 168篇 |
2016年 | 194篇 |
2015年 | 183篇 |
2014年 | 223篇 |
2013年 | 265篇 |
2012年 | 416篇 |
2011年 | 506篇 |
2010年 | 251篇 |
2009年 | 205篇 |
2008年 | 382篇 |
2007年 | 379篇 |
2006年 | 377篇 |
2005年 | 356篇 |
2004年 | 334篇 |
2003年 | 297篇 |
2002年 | 303篇 |
2001年 | 78篇 |
2000年 | 64篇 |
1999年 | 46篇 |
1998年 | 45篇 |
1997年 | 49篇 |
1996年 | 47篇 |
1995年 | 23篇 |
1994年 | 30篇 |
1993年 | 30篇 |
1992年 | 32篇 |
1991年 | 45篇 |
1990年 | 34篇 |
1989年 | 21篇 |
1988年 | 28篇 |
1987年 | 27篇 |
1986年 | 25篇 |
1985年 | 19篇 |
1984年 | 17篇 |
1983年 | 9篇 |
1979年 | 7篇 |
1978年 | 5篇 |
1977年 | 5篇 |
1975年 | 6篇 |
1972年 | 6篇 |
1971年 | 7篇 |
1969年 | 6篇 |
1967年 | 15篇 |
排序方式: 共有6528条查询结果,搜索用时 15 毫秒
1.
Hideki Kawaguchi Kazuko Masuo Tomohiro Katsuya Ken Sugimoto Hiromi Rakugi Toshio Ogihara Michael L Tuck 《Hypertension research》2006,29(12):951-959
High blood pressure (BP) is a major determinant of cardiovascular events in obesity. The beta2- and beta3-adrenoceptor polymorphisms are associated with obesity and hypertension. In the present study, we examine the relationships of beta2- and beta3-adrenoceptor polymorphisms with further weight gain-induced BP elevation in obese subjects. Changes in BP, body weight, total body fat-mass, waist-to-hip ratio, plasma norepinephrine (NE) and leptin levels, and beta2(Arg16Gly)- and beta3(Trp64Arg)-adrenoceptor polymorphisms were measured periodically over a 5-year period in 55 entry obese (body mass index [BMI]> or =25.0 kg/m(2)) normotensive (BP<140/90 mmHg) men. BP elevation and weight gain were defined as > or =10% increases from entry levels over 5 years in mean BP or BMI. Obese subjects with weight gain, BP elevation or weight gain-induced BP elevation had higher frequencies of the Gly16 allele of Arg16GIy and Arg64 allele of Trp64Arg. Subjects carrying the Gly16 or Arg64 alleles had significantly greater total fat-mass and waist-to-hip ratio at entry and over a 5-year period compared to the subjects who did not carry these polymorphisms. Subjects carrying the Gly16 allele had similar levels of plasma NE, higher levels of plasma leptin and a lower slope of the regression lines between plasma leptin and NE levels. Those carrying the Arg64 allele had higher plasma NE levels at entry and over a 5-year period compared to the subjects without the Arg64 allele, but plasma leptin levels and slopes were similar. The findings demonstrate that the Arg64 allele of the beta3-adrenoceptor polymorphisms relates to weight gain-induced BP elevation accompanying high plasma NE (heightened sympathetic activity) in obese men. The Gly16 allele of the beta2-adrenoceptor polymorphisms links to weight gain-induced BP elevation associated with leptin resistance. beta2- and beta3-adrenoceptor polymorphisms could predict the future BP elevation and further weight gain-induced BP elevation in originally obese subjects. 相似文献
2.
Takanori Kikuchi Naoshi Fukui Tomohiro Sakuta Toshijiro Yamaguchi Hiroya Sakai Hiromi Oda 《Journal of orthopaedic science》1997,2(1):31-39
The midportion of the anterior cruciate ligament (ACL) of rabbits was partially transected, and the effect of hyaluronan (HA) on its healing was determined. A 1% solution of HA (HA group) or physiological phosphate-buffered saline (control group) was administered intraarticularly, at 0.1 ml/kg body weight, once a week from 1 week after the operation. Two, 4, and 6 weeks after the initiation of HA administration, the ACLs were examined grossly, histologically and immunohistochemically. At 2 weeks, the lacerated portions were completely covered with scar-like tissue in both groups. These tissue areas were smaller in the HA group than in the control group. Histologically in the HA group, the regularity of collagen fibers (indicating the maturity of regenerated collagen fibers) had increased compared to findings in the control group, and the number of fibroblastic cells decreased gradually at a significantly faster rate. The number of inflammatory cells and blood vessels decreased gradually in both groups, with these values being lower in the HA group at each time point but not significantly so. Immunohistochemical examination of the repaired tissue revealed strong staining with anti-chondroitin sulfate proteoglycan antibody in the HA group 2 weeks after the first HA administration. The staining gradually became reduced, with the rate of reduction being faster in the HA group than in the control group. The stimulation of chondroitin sulfate proteoglycan production and the faster reduction of it in the HA group suggests that HA facilitated tissue repair and inhibited the formation of scar tissue. 相似文献
3.
Jhoji Tanabe Hirohiko Nakazato Hisayoshi Tanabe Hidetoshi Hanasaki Kazuo Kawasaki Daizo Yonemura 《Documenta ophthalmologica. Advances in ophthalmology》1986,63(2):165-171
The spectral response curve (amplitude versus wavelength) of the R2 of the early receptor potential (ERP) was studied in normal, protan, and deutan subjects. The R2 amplitude peaked at 520nm in most normal subjects. The R2 at long wavelengths was smaller than normal in protans and larger than normal in deutans when the maximum amplitudes were normalized to 100% at the peak. The ratio of the R2 amplitude at 460 nm to that at 600 nm clearly differed between protans and deutans. The ERP and the rapid off-response, which is mainly due to the cessation of the late receptor potential, were recorded in the same subjects. The ratio of the sensitivity of the rapid off-response at 500 nm to that at 600 nm was correlated with the ratio of the R2 amplitude at 460 nm to that at 600nm (correlation coefficient, 0.823, p < 0.001). This study, in conjunction with our previous study, indicates that the abnormality is in the outer segments of the cones in protans and deutans. 相似文献
4.
Hironori Nakagami Yasushi Kikuchi Tomohiro Katsuya Ryuichi Morishita Hiroshi Akasaka Shigeyuki Saitoh Hiromi Rakugi Yasufumi Kaneda Kazuaki Shimamoto Toshio Ogihara 《Hypertension research》2007,30(12):1239-1246
We examined a gene polymorphism of a novel Z-disc-related protein, myospryn (cardiomyopathy-associated 5). We focused on one haplotype block associated with a tag single nucleotide polymorphism (SNP) that covered 16 of 27 coding SNPs with linkage disequilibrium (minor allele frequency 0.413). Screening a myospryn polymorphism (K2906N) in a general health check-up of a rural Japanese population revealed an association with cardiac diseases (p=0.0082). In further analysis of the interaction between K2906N and cardiac function in patients, K2906N was associated with the anteroseptal wall thickness of the left ventricle in a recessive model (p=0.0324) and with the ratio of the peak velocity of the early diastolic filling wave to the peak velocity of atrial filling (A/E) (p=0.0278). In an association study based on left ventricular wall thickness, we found a significant difference in the K2906N genotype between controls and patients with cardiac hypertrophy. These results suggest that the K2906N polymorphism could be clinically associated with left ventricular hypertrophy and diastolic dysfunction independent of known parameters. Although the precise mechanism underlying this association remains to be elucidated, treatment with angiotensin II induced an increase in heart myospryn mRNA level in vitro and in vivo. Our results suggest that the polymorphism of myospryn is associated with left ventricular hypertrophy, and an association between a Z-disc protein and cardiac adaptation in response to pressure overload. 相似文献
5.
6.
Yutaka Ejima Yoko Hasegawa Satoru Sanada Noriyuki Miyama Ryo Hatano Tomohiro Arata Michiko Suzuki Itsuro Kazama Akira Sato Susumu Satomi Wataru Hida Mitsunobu Matsubara 《Hypertension research》2006,29(4):261-267
Since the prevalence and clinical characteristics of young-onset hypertension are still to be elucidated, we performed targeted-screening at an annual university health check-up for two consecutive years. Out of 16,464 subjects in 2003 and 17,032 in 2004 that were aged less than 30 years, 22 and 26 students (all males) exhibited high blood pressure (BP), respectively, on three occasions during casual BP measurements at the Tohoku University Health Center (systolic and diastolic BP of 140 and/or 90 mmHg or greater, respectively). These students were asked to measure their BP at home, and 9 subjects in total were diagnosed as having essential hypertension (EH). The remaining students were diagnosed as having white coat hypertension (WCH). In 8 out of 9 EH students, their father and/or mother had also been treated with antihypertensive medication. Adjustment by attendance ratio for each BP measurement suggested that the incidence of EH was around 0.1% and that of hypertension (EH and WCH) was around 0.5% in university students aged less than 25 years, since most of the subjects and hypertensive students were between 18 and 24 years old. Body mass index of the EH, which was more than 25 kg/m2 (overweight), was significantly higher than that with WCH. In conclusion, the combination of repeated casual BP measurements and home BP effectively identified young-onset EH. The clinical parameters indicated that male gender, genetic background, and excessive weight were risk factors for young-onset hypertension. 相似文献
7.
Yutaka Yonemura Masataka Segawa Hisashi Matsumoto Kouichirou Tsugawa Itasu Ninomiya Luis Fonseca Takashi Fujimura Kazuo Sugiyama Kouichi Miwa Itsuo Miyazaki 《Surgery today》1994,24(6):488-493
Because gastric cancers located in the upper third of the stomach are difficult to detect at an early stage, the surgical results remain poor. We performed R4 gastrectomy as a radical procedure for 25 patients, involving complete resection of the latero-aortic and interaorticovenous lymph modes above and below the left renal vein, in combination with the ordinary R2 or R3 gastrectomy (the R4 group). These patients were compared with 156 others who underwent R2 gastrectomy alone (the R2 group). There were no significant differences in operation time, blood loss, or the incidence of complications between the two groups; however, when the survival rates of the patients with tumors invading beyond the subserosa were compared, the 5-year survival rate was found to be significantly higher in the R4 group than in the R2 group. Furthermore, in patients with para-aortic nodal involvement, a significant survival advantage was observed in the R4 group, as compared with the R2 group. These results suggest that the R4 gastrectomy is a rational approach for patients with advanced gastric cancer located in the upper third of the stomach. 相似文献
8.
Yasuyuki Yamashita Katsuhiko Mitsuzaki Yi Tang Tomohiro Namimoto Mutsumasa Takahashi 《Journal of magnetic resonance imaging : JMRI》1997,7(4):623-628
MR angiography (MRA) was performed in 50 consecutive subjects (mean age, 59 years), who had been referred for abdominal MRA, on a 1.5-T superconductive unit that used a body phased-array coil. Three breath-hold three-dimensional sequences were evaluated both in phantom and clinical studies: (a) standard fast three-dimensional gradient-echo sequence (TR = 15, TE = 6; imaging time, 32 seconds), (b) ultrafast three-dimensional gradient-echo sequence (TR = 8.2, TE = 3; imaging time, 18 seconds), and (c) ultrafast magnetization-prepared (MP) rapid acquisition gradient echo (RAGE) (TR = 5.8, TE = 2.9, inversion time [TI] = 20; imaging time, 15 seconds). The initial 30 patients were randomized into three groups by three separate sequences. For the remaining 20 patients, ultrafast-gradient-echo and ultrafast MP-RAGE sequences were performed. Conventional angiography was performed on 36 patients. Signal measurements of the phantom and clinical images of the aorta, visceral branches of the aorta, iliac arteries, inferior vena cavae, and portal veins were performed. The overall image quality and background fatty tissue contrast of the vessels were rated subjectively. Comparison of images between MRA and conventional angiography also was performed. The contrast between the vessels and background fatty tissue was significantly higher in the ultrafast MP-RAGE sequence in both quantitative and qualitative analysis, and image-quality ultrafast MP-RAGE was superior to the other two sequences (P < .01). The aorta and iliac arteries could be visualized in all pulse sequences, and abnormalities of these vessels were diagnosed correctly. The renal artery was visualized more clearly with the two ultrafast sequences. 相似文献
9.
Vav3 modulates B cell receptor responses by regulating phosphoinositide 3-kinase activation. 总被引:7,自引:0,他引:7
Kazunori Inabe Masamichi Ishiai Andrew M Scharenberg Norman Freshney Julian Downward Tomohiro Kurosaki 《The Journal of experimental medicine》2002,195(2):189-200
To elucidate the mechanism(s) by which Vav3, a new member of the Vav family proteins, participates in B cell antigen receptor (BCR) signaling, we have generated a B cell line deficient in Vav3. Here we report that Vav3 influences phosphoinositide 3-kinase (PI3K) function through Rac1 in that phosphatidylinositol-3,4,5-trisphosphate (PIP3) generation was attenuated by loss of Vav3 or by expression of a dominant negative form of Rac1. The functional interaction between PI3K and Rac1 was also demonstrated by increased PI3K activity in the presence of GTP-bound Rac1. In addition, we show that defects of calcium mobilization and c-Jun NH2-terminal kinase (JNK) activation in Vav3-deficient cells are relieved by deletion of a PIP3 hydrolyzing enzyme, SH2 domain-containing inositol polyphosphate 5'-phosphatase (SHIP). Hence, our results suggest a role for Vav3 in regulating the B cell responses by promoting the sustained production of PIP3 and thereby calcium flux. 相似文献
10.
Masatoshi Kubo Shigeharu Moriyama Tomohiro Nogami Tadayoshi Kunitomo Sugato Nawa 《The Japanese Journal of Thoracic and Cardiovascular Surgery》2004,52(9):435-438
This paper presents a case of intercostal hemangioma, in which a complete surgical resection was accomplished based upon a
tentative diagnosis provided by magnetic resonance imaging (MRI). A 27-year-old man visited our hospital for the evaluation
of chest pain and shortness of breath after exertion. Computed tomography showed a soft tissue mass, 5.5×3.5 cm in size, arising
from the right lateral 7th intercostal space. Dynamic MRI showed that the mass was enhanced rapidly in the early phase and
that this early enhancement was maintained during the delayed phase, which was compatible with a diagnosis of intercostal
hemangioma. The patient underwent surgery, and a complete resection of the tumor with the right 7th and 8th ribs and their
intercostal muscles was accomplished. Histopathological examination confirmed the diagnosis of intramuscular hemangioma of
the large-vessel type. Presently, 6 months after the operation, the patient is doing well, without any evidence of local recurrence. 相似文献