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2.
K Tanaka Y Miyake S Sasaki Y Ohya S Miyamoto I Matsunaga T Yoshida Y Hirota H Oda 《Magnesium research》2006,19(4):268-275
There have only been a few studies on the role of mineral intake in tooth loss. We investigated the association between mineral intake and the prevalence of tooth loss in Japan. We used the baseline data on 1002 pregnant women who were enrolled in the Osaka Maternal and Child Health Study between November 2001 and March 2003. Tooth loss was defined as the previous extraction of one or more teeth. Nutrient intake was assessed by a validated diet history questionnaire. Prevalence odds ratios and confidence intervals were estimated by applying a multiple logistic regression model. The adjusted odds ratio upon comparison of the highest quartile with the lowest quartile of magnesium intake was 0.64 (95% confidence interval, 0.42-0.99), showing a tendency for an inverse dose-response relationship (p for linear trend = 0.05). There were no associations between the level of consumption of calcium, phosphate, iron, zinc, or copper and tooth loss. The present findings suggest that intake of magnesium is related to reduced prevalence of tooth loss among young Japanese women. 相似文献
3.
T Yamagami S Iida T Kato T Hirota T Nishimura 《Journal of Medical Imaging and Radiation Oncology》2006,50(1):75-78
We present a patient with gastric varices complicating portal hypertension caused by liver cirrhosis related to hepatitis C virus. The patient underwent balloon‐occluded retrograde transvenous obliteration. The gastric varices almost completely disappeared, without any sclerotic agent being used, after iatrogenic injury of the gastrorenal shunt at the time of the interventional procedure. 相似文献
4.
A new diterpene antitumor antibiotic, myrocin C, has been isolated from the culture filtrate of a soil fungus, Myrothecium verrucaria strain No. 55. The antibiotic was effective against Gram-positive bacteria, fungi and yeasts, and prolonged the life span of mice bearing Ehrlich ascites carcinoma. 相似文献
5.
Do local anaesthetics interact with dihydropyridine binding sites on neuronal L-type Ca2+ channels? 总被引:1,自引:0,他引:1
Hirota K.; Browne T.; Appadu B. L.; Lambert D. G. 《British journal of anaesthesia》1997,78(2):185-188
We have examined the interaction of procaine, prilocaine, lignocaine,
bupivacaine, amylocaine and R(+) and S(-) ropivacaine with L-type
voltage-sensitive Ca2+ channels in rat cerebrocortical membranes. Membranes
were prepared in Tris HCl 50 mmol litre-1, pH 7.4, by homogenization and
centrifugation. Binding assays were performed in 1- ml volumes of Tris HCl
50 mmol litre-1, pH 7.4, for 90 min at room temperature using approximately
200 micrograms of protein. Non-specific binding was defined in the presence
of nifedipine 10(-5) mol litre-1, and bound and free radioactivity were
separated by vacuum filtration. The effects of local anaesthetics were
determined by displacement of [3H]PN200-110 (approximately 0.2 nmol
litre-1), a radiolabelled 1,4- dihydropyridine (DHP) L-channel antagonist.
The concentration of displacer producing 50% displacement was corrected for
the competing mass of [3H]PN200-110 to yield the affinity constant, K50.
All local anaesthetics displaced [3H]PN200-110 in a dose-dependent manner
with a rank order potency of (K50, mmol litre-1) bupivacaine (0.48),
amylocaine (0.74), lignocaine (1.09), prilocaine (2.06) and procaine
(2.09). Ropivacaine enantiomers did not show stereo-selective displacement,
with K50 values of 0.99 and 0.92 mmol litre-1 for R(+) and S(-)
ropivacaine, respectively. There was a significant correlation between pK50
and p (octanol:buffer partition coefficient) (r2 = 0.872, P = 0.020), pK50
and p (local anaesthetic potency) (r2 = 0.816, P = 0.036), pK50 and p
(relative conduction blocking potency) (r2 = 0.843, P = 0.028) and between
pK50 and p (IC50 for inhibition of cardiac output) (r2 = 0.897, P = 0.015).
These data suggest that DHP binding sites may be involved in both the
mechanism of local anaesthesia and the cardiotoxicity of these agents.
相似文献
6.
7.
H M Kim S Hirota H Onoue T Hirata K Suzuki S Ohno T Kuroki Y Kitamura S Nomura 《Brain research. Developmental brain research》1992,70(2):239-244
The expression and localization of a novel protein kinase C delta (nPKC delta) mRNA were investigated using Northern blotting and in situ hybridization in the developmental process of mouse brain. In adult mice, nPKC delta was abundantly expressed in the thalamus, moderately in the pons and the cerebellum, but faintly in the cerebral cortex and the spinal cord. By in situ hybridization, the signals were observed specifically at the sensory and motor relay nuclei of the thalamus, the dorsal cochlear nuclei of the pons, and the molecular layer of the cerebellum. When developmental changes in the expression of nPKC delta gene were analyzed by in situ hybridization, it was not detectable in embryonic and neonatal brains, very weakly expressed in the thalamus in the first week, and highly expressed at two weeks of age. These results suggest that the gene expression of nPKC delta is strictly controlled by both the cell type and the developmental process. 相似文献
8.
Herschman Harvey R.; Lim Robert W.; Brankow David W.; Fujiki Hirota 《Carcinogenesis》1989,10(8):1495-1498
Okadaic acid (OA) and 12-O-tetradecanoylphorbol-13-acetate (TPA)are both potent tumor promoters in a mouse skin carcinogenesisexperiment. OA was much more toxic than TPA for murine embryocell lines such as Swiss 3T3 cells or C3H10T? cells. TPA isa potent mitogen for 3T3 cells; in contrast OA was unable tostimulate DNA synthesis in these cells. TPA induces a familyof primary response genes, the TPA induced sequence (TIS) genes,in a wide variety of cells. Although OA induced modest levelsof TIS mRNA expression, the time course of the induction ofTIS1 and TIS8 mRNA was delayed when compared to induction byTPA or peptide mitogeas such as fibroblast growth factor (FGF).In addition TPA-mediated down-regulation of protein kinase Cattenuated TIS gene induction by OA, but not by FGF. 相似文献
9.
Covalent binding of rofecoxib, but not other cyclooxygenase-2 inhibitors, to allysine aldehyde in elastin of human aorta. 总被引:1,自引:0,他引:1
Masataka Oitate Takashi Hirota Takahiro Murai Shin-Ichi Miura Toshihiko Ikeda 《Drug metabolism and disposition》2007,35(10):1846-1852
In rats, it has been reported that rofecoxib, a cyclooxygenase-2 (COX-2) inhibitor, reacts with the aldehyde group of allysine in elastin to give a condensation covalent adduct, thereby preventing the formation of cross-linkages in the elastin and causing degradation of the elastic fibers in aortas in vivo. Acid, organic solvent, and proteolytic enzyme treatments of human aortic homogenate after incubation with [(14)C]rofecoxib demonstrated that most of the radioactivity is covalently bound to elastin. The in vitro covalent binding was inhibited in the presence of beta-aminopropionitrile, D-penicillamine, and hydralazine, which suggested that the aldehyde group of allysine in human elastin was relevant to the covalent binding. The in vitro covalent binding of [(14)C]rofecoxib was significantly decreased by the addition of only nonradiolabeled rofecoxib but not the other COX-2 inhibitors, celecoxib, valdecoxib, etoricoxib, and CS-706 [2-(4-ethoxyphenyl)-4-methyl 1-(4-sulfamoylphenyl)-1H-pyrrole], a novel selective COX-2 inhibitor. All the above COX-2 inhibitors except for rofecoxib had no reactivity with the aldehyde group of benzaldehyde used as a model compound of allysine aldehyde under a physiological pH condition. On the other hand, no retention of the radioactivity of [(14)C]rofecoxib was observed in human aortic endothelial cells in vitro, suggesting that rofecoxib is not retained in aortic endothelial cells in vivo. These results suggest that rofecoxib, but not other COX-2 inhibitors, is capable of covalently binding to the aldehyde group of allysine in human elastin. This might be one of the main causes of cardiovascular events by rofecoxib in clinical situations. 相似文献
10.
Mitsuru Masaki Tadashi Kuroda Naoki Hosen Hisao Hirota Kazuo Terai Yuichi Oshima Yoshikazu Nakaoka Shoko Sugiyama Ryusuke Kimura Satoshi Yoshihara Manabu Kawakami Norishige Iizuka Yasuhiko Tomita Hiroyasu Ogawa Ichiro Kawase Keiko Yamauchi-Takihara 《Journal of the American Society of Echocardiography》2004,17(4):397-398
A 57-year-old man with a history of renal cell carcinoma presented with presyncope. He underwent nephrectomy years earlier followed by HLA-matched allogeneic peripheral-blood stem-cell transplantation. Echocardiographic investigation revealed a solitary right ventricle mass without contiguous vena caval or right atrial involvement. The mass was pathologically confirmed to be metastatic carcinoma in the right ventricular cavity. This case highlights the need to consider an underlying neoplastic syndrome in patients presenting isolated right ventricle mass by echocardiography. 相似文献