全文获取类型
收费全文 | 2451篇 |
免费 | 147篇 |
国内免费 | 10篇 |
专业分类
耳鼻咽喉 | 20篇 |
儿科学 | 36篇 |
妇产科学 | 34篇 |
基础医学 | 323篇 |
口腔科学 | 79篇 |
临床医学 | 215篇 |
内科学 | 657篇 |
皮肤病学 | 73篇 |
神经病学 | 124篇 |
特种医学 | 67篇 |
外科学 | 278篇 |
综合类 | 2篇 |
一般理论 | 2篇 |
预防医学 | 134篇 |
眼科学 | 36篇 |
药学 | 194篇 |
中国医学 | 5篇 |
肿瘤学 | 329篇 |
出版年
2023年 | 31篇 |
2022年 | 45篇 |
2021年 | 86篇 |
2020年 | 43篇 |
2019年 | 57篇 |
2018年 | 79篇 |
2017年 | 52篇 |
2016年 | 57篇 |
2015年 | 67篇 |
2014年 | 84篇 |
2013年 | 106篇 |
2012年 | 195篇 |
2011年 | 190篇 |
2010年 | 112篇 |
2009年 | 100篇 |
2008年 | 153篇 |
2007年 | 167篇 |
2006年 | 126篇 |
2005年 | 134篇 |
2004年 | 117篇 |
2003年 | 98篇 |
2002年 | 102篇 |
2001年 | 28篇 |
2000年 | 48篇 |
1999年 | 54篇 |
1998年 | 12篇 |
1997年 | 13篇 |
1996年 | 17篇 |
1995年 | 22篇 |
1994年 | 14篇 |
1993年 | 6篇 |
1992年 | 26篇 |
1991年 | 23篇 |
1990年 | 17篇 |
1989年 | 19篇 |
1988年 | 16篇 |
1987年 | 11篇 |
1986年 | 12篇 |
1985年 | 13篇 |
1984年 | 6篇 |
1983年 | 7篇 |
1980年 | 4篇 |
1979年 | 7篇 |
1978年 | 3篇 |
1976年 | 2篇 |
1975年 | 4篇 |
1974年 | 3篇 |
1972年 | 6篇 |
1971年 | 2篇 |
1967年 | 4篇 |
排序方式: 共有2608条查询结果,搜索用时 15 毫秒
51.
52.
Natsumi Desaka Chinatsu Ota Hitomi Nishikawa Kayo Yasuda Naoaki Ishii Tomohiro Bito Yukio Kishinaga Yuji Naito Yasuki Higashimura 《Journal of Clinical Biochemistry and Nutrition》2022,70(1):7
Streptococcus thermophilus bacteria, which are widely used as fermented starter for dairy production, exert various beneficial health effects. Nevertheless, even though pro-longevity effects of various probiotics have been reported, no report has described Streptococcus thermophilus effects on longevity. This study was conducted to evaluate Streptococcus thermophilus effects on lifespan extension and to elucidate the Streptococcus thermophilus-mediated longevity mechanism using Caenorhabditis elegans worms as a model animal. They were fed standard food (Escherichia coli OP50) or Streptococcus thermophilus from the young adult stage. Feeding with Streptococcus thermophilus, compared to Escherichia coli OP50, to Caenorhabditis elegans extend the lifespan, reduced lipofuscin accumulation, and maintain vigorous locomotion. Feeding with Streptococcus thermophilus did not alter the worm growth curve or the offspring number, indicating that the Streptococcus thermophilus-mediated lifespan extension is not attributable to caloric restriction. The qRT-PCR data showed that Streptococcus thermophilus increased the expression of daf-16 and some of its downstream antioxidant genes. Furthermore, the pro-longevity effects of Streptococcus thermophilus were decreased in loss-of-function mutant of daf-16. Results show that Streptococcus thermophilus extends the lifespan of Caenorhabditis elegans through DAF-16-mediated antioxidant pathway activation. 相似文献
53.
Otsuki Naoki Morita Naruhiko Furukawa Tatsuya Teshima Masanori Shinomiya Hitomi Shinomiya Hirotaka Nibu Ken-ichi 《European archives of oto-rhino-laryngology》2019,276(6):1809-1814
European Archives of Oto-Rhino-Laryngology - Papillary thyroid carcinoma frequently metastasizes to central and lateral neck lymph nodes, but metastasis to retropharyngeal lymph nodes (RPLN) is... 相似文献
54.
Hidetoshi Takahashi Hitomi Tsuji Akemi Ishida‐Yamamoto Hajime Iizuka 《The Journal of dermatology》2013,40(1):39-42
We examined the relation between adalimumab and infliximab plasma trough levels, anti‐adalimumab and anti‐infliximab antibody formation. We analyzed plasma from 32 adalimumab‐treated and 20 infliximab‐treated psoriasis patients for evaluating trough levels of each drug. The presence of anti‐adalimumab and anti‐infliximab antibodies was analyzed and the severity of psoriasis was evaluated. At week 28, 25 out of 32 and at week 48, 21 out of 30 adalimumab‐treated patients maintained as more than PASI 75. At week 28, 12 out of 20 and at week 48, nine out of 18 infliximab‐treated patients were evaluated as more than PASI 75. In patients treated with 40 mg adalimumab every other week, the mean trough level was 7.62 μg/mL (range, 0.05–10.6) at week 48. In patients treated with 80 mg adalimumab every other week, the mean trough level was 8.61 μg/mL (range, 0.08–13.5) at week 48. Mean trough level of infliximab‐treated cases (4.1–5.2 mg/kg; mean, 4.6) was 4.64 μg/mL (range, 0.03–16.9) at week 48. Anti‐adalimumab antibody was detected in five out of 32 cases and anti‐infliximab antibody was detected in six out of 20 cases, respectively, at weeks 24 and 48. The optimal cut‐off values of adalimumab and infliximab concentration for more than PASI 75 were more than 7.84 μg/mL and more than 0.92 μg/mL, respectively. The trough levels of adalimumab and infliximab in psoriasis patients were positively associated with clinical response and were significantly lower in cases having anti‐adalimumab or anti‐infliximab antibodies. 相似文献
55.
56.
Hitomi Sakurai Mitsuaki Suzuki Shoko Itakura Hiroaki Todo Florencio Arce Jr. Gerard Lee See Takashi Tanikawa Yutaka Inoue 《Materials》2022,15(8)
Ellagic acid (EA), a natural polyphenol found in berries, has high antioxidant capacity. This study aimed to improve EA solubility by complex formation with urea (UR) using solvent evaporation method and evaluate its solubility, antioxidant capacity, and physical properties. The solubility test (25 °C, 72 h) showed that the solubility of EVP (EA/UR = 1/1) was approximately two-fold higher than that of EA (7.13 µg/mL versus 3.99 µg/mL). Moreover, the IC50 values of EA and EVP (EA/UR = 1/1) (1.50 µg/mL and 1.30 µg/mL, respectively) showed higher antioxidant capacity of EVP than that of EA. DSC analysis revealed that the UR peak at 134 °C disappeared, and a new endothermic peak was observed at approximately 250 °C for EVP (EA/UR = 1/1). PXRD measurements showed that the characteristic peaks of EA at 2θ = 12.0° and 28.0° and of UR at 2θ = 22.0°, 24.3°, and 29.1° disappeared and that new peaks were identified at 2θ = 10.6°, 18.7°, and 26.8° for EVP (EA/UR = 1/1). According to 2D NOESY NMR spectroscopy, cross-peaks were observed between the -NH and -OH groups, suggesting intermolecular interactions between EA and UR. Therefore, complexation was confirmed in EA/UR = 1/1 prepared by solvent evaporation, suggesting that it contributed to the improvement in solubility and antioxidant capacity of EA. 相似文献
57.
Kazuo Yamada Kazuhiko Nakamura Yoshio Minabe Yoshimi Iwayama-Shigeno Hitomi Takao Tomoko Toyota Eiji Hattori Noriyoshi Takei Yoshimoto Sekine Katsuaki Suzuki Yasuhide Iwata Ko Miyoshi Akiko Honda Kousuke Baba Taiichi Katayama Masaya Tohyama Norio Mori Takeo Yoshikawa 《Neuropsychopharmacology》2004,56(9):683-690
BACKGROUND: DISC1 has been suggested as a causative gene for psychoses in a large Scottish family. We recently identified FEZ1 as an interacting partner for DISC1. To investigate the role of FEZ1 in schizophrenia and bipolar disorder, case-control association analyses were conducted in Japanese cohorts. METHODS: We performed a mutation screen of the FEZ1 gene and detected 15 polymorphisms. Additional data on informative polymorphisms were obtained from public databases. Eight single nucleotide polymorphisms (SNPs) were analyzed in 119 bipolar disorder and 360 schizophrenic patients and age- and gender-matched control subjects. All genotypes were determined with the TaqMan assay, and selected samples were confirmed by sequencing. RESULTS: The two adjacent polymorphisms displayed a nominally significant association with schizophrenia (IVS2+ 1587G>A, p = .014; 396T相似文献
58.
Hisashi Yamanaka Shouhei Nagaoka Soo-Kon Lee Sang-Cheol Bae Tsuyoshi Kasama Hitomi Kobayashi 《Modern rheumatology / the Japan Rheumatism Association》2016,26(5):651-661
Objectives: To investigate the efficacy and safety of etanercept (ETN) in patients with rheumatoid arthritis (RA) with moderate disease activity and the possibility to discontinue ETN after achieving remission.Methods: Multicenter, randomized, and open-label study was conducted in Japan and Korea. RA patients (disease duration?<5 years) with moderate disease activity despite methotrexate (MTX) treatment were allocated to either MTX or ETN?+?MTX (Period 1) for 12 months. Patients who achieved sustained remission defined as DAS28?<?2.6 at both 6 and 12 months in the ETN?+?MTX group, were randomized to either continue or discontinue ETN for 12 months (Period 2).Results: A total of 222 patients were enrolled in Period 1 and clinical remission was achieved in 106/157 (67.5%) and 5/28 (17.9%) patients in the ETN?+?MTX and MTX groups, respectively. In Period 2, sixty-seven patients were randomized and finally 28/32 (87.5%) and 15/28 (53.6%) patients who continued or discontinued ETN maintained clinical remission. Baseline disease activity and the presence of comorbid diseases influenced the maintenance of remission after ETN discontinuation.Conclusions: ETN?+?MTX was efficient for RA patients with moderate disease activity into remission. After achieving sustained remission, a half of the patients who discontinued ETN could maintain remission for 1 year. 相似文献
59.
Takanobu Shioya Susumu Sato Masahiro Iwakura Hitomi Takahashi Yoshino Terui Sachiko Uemura Masahiro Satake 《Respiratory investigation》2018,56(4):292-306
Physical activity (PA) is defined as bodily movement produced by skeletal muscles with energy expenditure beyond resting levels. PA is closely related to reduced morbidity and mortality in chronic obstructive pulmonary disease (COPD). Self-report questionnaires are often subject to recall bias, correlating poorly with objectively qualified PA, and do not provide an accurate estimate of free-living energy expenditure. PA may be objectively evaluated by newly developed tri-axial accelerometers by quantifying steps or body movements over a period of time. Low-intensity, home-based pulmonary rehabilitation (PR) using pedometer feedback improves PA. Improvement in physiological factors correlates with increased walking time in stable elderly COPD patients.This review focuses on the effects of PR and pharmacological treatment on PA in COPD patients. We selected 32 studies from our literature search evaluating the effects of PR and 11 studies examining the effects of pharmacological treatment on PA. Findings in both categories were inconsistent. Nineteen studies showed a positive effect with PR whereas 13 showed no effect. Eight studies showed a positive effect, while three revealed no effect from pharmacological intervention. As both interventions increase exercise capacity without a consistent effect on PA, counseling with behavioral changes may be necessary to achieve a significant and lasting increase in PA. Changing PA behavior in COPD patients requires an interdisciplinary approach involving specialists in respiratory medicine, rehabilitation, social, and behavioral sciences. Future research in this area is warranted to advance our knowledge in this area, specifically with regard to the interaction of pharmacological and non-pharmacological interventions. 相似文献
60.
Kensaku Aihara Toru Oga Yuichi Chihara Yuka Harada Kiminobu Tanizawa Tomohiro Handa Takefumi Hitomi Kazuko Uno Michiaki Mishima Kazuo Chin 《Sleep & breathing》2013,17(2):597-604