全文获取类型
收费全文 | 2068篇 |
免费 | 80篇 |
国内免费 | 9篇 |
专业分类
耳鼻咽喉 | 28篇 |
儿科学 | 77篇 |
妇产科学 | 23篇 |
基础医学 | 295篇 |
口腔科学 | 74篇 |
临床医学 | 146篇 |
内科学 | 409篇 |
皮肤病学 | 12篇 |
神经病学 | 130篇 |
特种医学 | 76篇 |
外科学 | 308篇 |
综合类 | 12篇 |
预防医学 | 73篇 |
眼科学 | 22篇 |
药学 | 270篇 |
中国医学 | 12篇 |
肿瘤学 | 190篇 |
出版年
2023年 | 7篇 |
2022年 | 19篇 |
2021年 | 19篇 |
2020年 | 12篇 |
2019年 | 6篇 |
2018年 | 19篇 |
2017年 | 17篇 |
2016年 | 17篇 |
2015年 | 24篇 |
2014年 | 26篇 |
2013年 | 43篇 |
2012年 | 149篇 |
2011年 | 146篇 |
2010年 | 55篇 |
2009年 | 42篇 |
2008年 | 141篇 |
2007年 | 144篇 |
2006年 | 142篇 |
2005年 | 157篇 |
2004年 | 145篇 |
2003年 | 131篇 |
2002年 | 135篇 |
2001年 | 46篇 |
2000年 | 50篇 |
1999年 | 58篇 |
1998年 | 21篇 |
1997年 | 21篇 |
1996年 | 16篇 |
1995年 | 23篇 |
1994年 | 13篇 |
1993年 | 9篇 |
1992年 | 33篇 |
1991年 | 26篇 |
1990年 | 16篇 |
1989年 | 18篇 |
1988年 | 30篇 |
1987年 | 22篇 |
1986年 | 19篇 |
1985年 | 10篇 |
1984年 | 9篇 |
1983年 | 18篇 |
1982年 | 6篇 |
1981年 | 10篇 |
1980年 | 9篇 |
1979年 | 15篇 |
1978年 | 11篇 |
1977年 | 9篇 |
1976年 | 10篇 |
1975年 | 6篇 |
1972年 | 5篇 |
排序方式: 共有2157条查询结果,搜索用时 10 毫秒
1.
Moussa Ndong Machiko Kazami Tsukasa Suzuki Mariko Uehara Shin-ichi Katsumata Hirohumi Inoue Ken-Ichi Kobayashi Tadahiro Tadokoro Kazuharu Suzuki Yuji Yamamoto 《Nutrition Research》2009,29(9):640-647
Iron deficiency (ID) is one of the most commonly known forms of nutritional deficiencies. Low body iron is thought to induce neurologic defects but may also play a protective role against cancer development by cell growth arrest. Thus, ID may affect cellular pathways controlling cell growth and proliferation, the mechanism of which is still not fully understood. The serine/threonine protein kinase Akt and its downstream target, the mammalian Target of Rapamycin (mTOR), is known to play a crucial role in the regulation of cell growth and survival. Therefore, we hypothesized that Akt/mTOR pathway could be influenced by ID. Three-week-old male Wistar-strain rats were divided into 3 groups and the 2 groups had free access to a control diet (C group) or an iron-deficient diet (D group). The third group (PF group) were pair-fed the control diet to the mean intake of the D group. After 4 weeks, rats were killed and their brains were sampled. In separate experiments, COS-1 cells were cultured with or without the iron chelator deferoxamine. Western blots of brain samples and COS-1 lysates were used to analyze the expression and phosphorylation state of Akt, TSC2, mTOR, and S6 kinase proteins implicated in the Akt/mTOR pathway. Using 2 different ID models, we show for the first time that iron deficiency depresses Akt activity in rats and in COS-1 cells, leading to a decrease in mTOR activity. 相似文献
2.
3.
4.
5.
Late Effects of Childhood Acute Leukemia and Its Treatment 总被引:1,自引:0,他引:1
Masao Yamamoto M.D. Yoshitaka Fukunaga M.D. Ichiroh Tsukimoto M.D. Fumio Bessho M.D. Jun-ichi Akatsuka M.D. Ryohta Hosoya M.D. Shinpei Nakazawa M.D. Minoru Sakurai M.D. Kazuhiro Ueda M.D. Sumio Miyazaki M.D. Masaru Yokoyama M.D. Hideo Mugishima M.D. Kohzoh Nishimura M.D. 《Pediatrics international》1991,33(4):573-588
Late effects of childhood acute leukemia and its treatment were studied in 766 patients (684 ALL, 73 ANLL, and 9 others) in Japan who had remained in remission for more than 1 year after their first complete remission. Delayed adverse sequelae involve a wide variety of organs and their functions. Short stature was present in 2.61%, obesity in 3.79%, abnormalities of growth hormone secretion in 1.5%, delayed secondary sex characteristics in 1.5% of males and 0.6% of females, motor disturbances in 1.17%, sensory disturbances in 0.91%, intellectual and learning disabilities in 2.48%, abnormal findings in routine neurologic examinations in 1.31%, EEG abnormalities in 4.30%, brain CT abnormalities in 5.09% and cardiac dysfunction in 1.07%. Various other disorders were seen in 20 patients. Many of these delayed adverse sequelae are caused by or related to central nervous system prophylaxis and systemic combination chemotherapy. The results suggest that it is needed to improve therapeutic methods through the stratification of patients by risk factors and detailed analysis of prognostic factors. Moreover it is important to render medical and psychosocial support to long-term survivors of childhood leukemia through interactions between the patient, parents and medical staff. 相似文献
6.
Y Ohkura Y Mizoguchi S Morisawa S Takeda M Aburada E Hosoya 《Japanese journal of pharmacology》1990,52(2):331-336
It has been reported that leukotrienes (LTs) may play a role in inflammatory liver diseases, and several inhibitors of LTs show an inhibitory effect on experimental liver injuries. In this study, the effect of Gomisin A (TJN-101), which is a lignan component of schisandra fruits, on the arachidonic acid cascade in macrophages was examined to explain the mechanisms of the inhibitory effect of TJN-101 on liver injuries. The production of leukotriene B4 was suppressed by treatment with TJN-101, while the activity of 5-lipoxygenase was not affected. The release of arachidonic acid from macrophages stimulated with fMet-Leu-Phe or the Ca++ ionophore A23187 was suppressed by treatment with TJN-101. The activity of phospholipase A2 was not affected by treatment with TJN-101. These results suggested that TJN-101 produces an inhibitory effect on the biosynthesis of LTs by preventing the release of arachidonic acid, and it was thought that the preventive effect on the arachidonic acid cascade may be partially associated with the inhibitory effect of TJN-101 on liver injuries. 相似文献
7.
Sho Haneda M.D. Kouhei Fukushima M.D. Yuji Funayama M.D. Chikashi Shibata M.D. Ken-Ichi Takahashi M.D. Hitoshi Ogawa M.D. Munenori Nagao M.D. Kazuhiro Watanabe M.D. Iwao Sasaki M.D. 《Journal of gastrointestinal surgery》2006,10(7):1051-1059
Our previous studies demonstrated that sodium glucose cotransporter 1 (SGLT-1) was induced in the remnant ileum of total colectomized
rats via the action of factors other than hyperaldosteronism. The aim of the present study was to clarify whether fecal stream
is required for the enhancement of SGLT-1-mediated sodium transport. Twenty-seven pairs of ileal tissues were obtained from
the proximal and distal side, respectively, of loop ileostomy after total proctocolectomy. Mucosae were mounted in an Ussing
chamber to evaluate glucose-coupled sodium transport. Levels of SGLT-1 mRNA in proximal and distal mucosae were compared by
Northern blotting. Villous height and crypt depth were measured to test for correlations between mucosal structure and SGLT-1-mediated
sodium transport or mRNA expression levels. Both glucose-coupled sodium transport and expression of SGLT-1 mRNA were significantly
lower in distal mucosae relative to proximal mucosae. In distal mucosae, villous height, but not crypt depth, was significantly
lower than in proximal mucosae, demonstrating a positive correlation between villous height and SGLT-1 function and expression.
Comparative studies of proximal and distal mucosae demonstrated that in addition to hormonal changes, fecal stream is required
for full induction of the sodium transport system (which includes SGLT-1-mediated transport) in the remnant ileum following
total proctocolectomy.
Presented in part at the Forty-Sixth Annual Meeting of The Society for Surgery of the Alimentary Tract, Chicago, Illinois,
May 14–19, 2005 (poster presentation).
This work was supported by Grants-in-Aid for Scientific Research 10557118 and 14657295 from the Ministry of Education, Science
and Culture of Japan to K. Fukushima, and by Kanae Foundation to K. Fukushima. 相似文献
8.
Mechanism of skin penetration-enhancing effect by laurocapram. 总被引:6,自引:0,他引:6
K Sugibayashi S Nakayama T Seki K Hosoya Y Morimoto 《Journal of pharmaceutical sciences》1992,81(1):58-64
In order to clarify the mechanism of action of laurocapram (Azone) on the skin permeation of drugs, the following experiments were done. First, the effect of Azone on the skin components was compared with that of other penetration enhancers. Azone markedly fluidized liposomal lipids (as a model lipid system) compared with other enhancers. Ethanol extracted large amounts of the stratum corneum lipids, whereas Azone did not. These results suggest that the effect of Azone on the lipids in the stratum corneum is not the same as that of ethanol. In addition, ethanol increased the amount of free sulfhydryl (SH) group of keratin in the stratum corneum, whereas Azone did not directly affect the stratum corneum protein. Azone increased water content in the stratum corneum, as measured by skin conductance. This effect might be a reason for the action of Azone. For further understanding, the enhancing effects of Azone on the skin permeation of several model compounds (alcohols, sugars, and inorganic ions) were compared with the effects of pretreatment with distilled water, which was thought to increase water-holding capacity, and pretreatment with ethanol, which was thought to affect the lipids and protein in the skin barrier (i.e., stratum corneum). Pretreatment with water or ethanol enhanced skin permeation of hydrophilic compounds, whereas they decreased that of octanol, a hydrophobic compound. The tendency of Azone to increase or decrease the skin permeation rate of most compounds was similar to that of pretreatment with water or ethanol. However, the effect of Azone on the skin permeation of inorganic ions was relatively low, whereas that of pretreatment with water or ethanol was high.(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献
9.
10.
Chiari pelvic osteotomy for osteoarthritis. The influence of the torn and detached acetabular labrum 总被引:2,自引:0,他引:2
T Nishina S Saito K Ohzono N Shimizu T Hosoya K Ono 《The Journal of bone and joint surgery. British volume》1990,72(5):765-769
We assessed the results of Chiari pelvic osteotomy in 64 hips with early osteoarthritis in terms of acetabular labral detachment detected pre-operatively by arthrography. At an average follow-up of four years, assessment by the Merle d'Aubigńe score showed 83% excellent or good results. These satisfactory results were achieved in only half the cases with a detached labrum, but in nearly all cases with normal or torn acetabular labra. Other factors such as the acetabular index, the level and angle of osteotomy, and the displacement following osteotomy did not affect the results. Chiari pelvic osteotomy is a worthwhile procedure for early osteoarthritis in selected cases, but a detached acetabular labrum increases the risk of clinical failure. 相似文献