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261.
262.
Alex N. Bullock Santina Russo Ann Amos Nicholas Pagano Howard Bregman Judit é. Debreczeni Wen Hwa Lee Frank von Delft Eric Meggers Stefan Knapp 《PloS one》2009,4(10)
Background
The serine/threonine kinase PIM2 is highly expressed in human leukemia and lymphomas and has been shown to positively regulate survival and proliferation of tumor cells. Its diverse ATP site makes PIM2 a promising target for the development of anticancer agents. To date our knowledge of catalytic domain structures of the PIM kinase family is limited to PIM1 which has been extensively studied and which shares about 50% sequence identity with PIM2.Principal Findings
Here we determined the crystal structure of PIM2 in complex with an organoruthenium complex (inhibition in sub-nanomolar level). Due to its extraordinary shape complementarity this stable organometallic compound is a highly potent inhibitor of PIM kinases.Significance
The structure of PIM2 revealed several differences to PIM1 which may be explored further to generate isoform selective inhibitors. It has also demonstrated how an organometallic inhibitor can be adapted to the binding site of protein kinases to generate highly potent inhibitors.Enhanced version
This article can also be viewed as an enhanced version in which the text of the article is integrated with interactive 3D representations and animated transitions. Please note that a web plugin is required to access this enhanced functionality. Instructions for the installation and use of the web plugin are available in Text S1. 相似文献263.
Judit Kocsis Balázs Madaras Éva Katalin Tóth George Füst Zoltán Prohászka 《Cell stress & chaperones》2010,15(2):143-151
Many findings indicate that measuring the serum concentration of soluble 70-kD heat shock protein (soluble HSP70) may provide
important information in cardiovascular, inflammatory, and pregnancy-related diseases; however, only scarce data are available
in cancer. Therefore, using a commercial ELISA kit, we measured soluble HSP70 concentration in the sera of 179 patients with
colorectal cancer. We investigated the relationship between soluble HSP70 concentration and mortality, during 33.0 (24.4–44.0) months
long follow-up. High (>1.65 pg/ml, median concentration) soluble HSP70 level was a significant (hazard ratio: 1.88 (1.20–2.96,
p = 0.005) predictor of mortality during the follow-up period. When we compared the soluble HSP70 levels in patients with non-resected
primary tumors as compared to those who were recruited into the study 4–6 weeks after the tumor resection they were found
to be significantly (p = 0.020) higher in the former group. Since the patients with non-resected primary tumors had also distant metastasis and
died early, we limited the further analysis to 142 patients with no distant metastasis at the beginning of the follow-up.
This association remained significant even after multiple Cox-regression analysis had been performed to adjust the data for
age and sex (p = 0.028); age, sex, and TNM-T stage (p = 0.041); age, sex, and TNM-N stage (p = 0.021); age, sex, and histological grade (p = 0.023); or age, sex, and tumor localization (p = 0.029). Further analysis showed that the significant association between high HSP70 levels and poor survival is in the
strongest in the group of <70-year-old female patients (HR: 5.52 (2.02-15.15), p = 0.001), as well as in those who were in a less advanced stage of the disease at baseline. These novel findings indicate
that the serum level of soluble HSP70 might prove a useful, stage-independent prognostic marker in colorectal cancer without
distant metastasis. 相似文献
264.
Gergics P Patocs A Majnik J Balogh K Szappanos A Toth M Racz K 《The Journal of steroid biochemistry and molecular biology》2006,100(4-5):161-166
The Bcl I polymorphism of the glucocorticoid receptor gene, recently identified as an intronic C to G change 646 nucleotides downstream of exon 2, has been associated with increased sensitivity to glucocorticoids and its potential relevance in metabolic disturbances and in various disorders has been extensively investigated. In the present study, we designed a single-tube allele-specific polymerase chain reaction for genotyping this polymorphism in peripheral blood DNA samples. When the Bcl I polymorphism was detected with this novel method in a cohort of 247 healthy subjects, the observed genotype distribution matched the Hardy–Weinberg equilibrium (100 subjects homozygous for the wild-type, 124 heterozygous and 23 homozygous for the mutant allele). In 50 randomly selected subjects the Bcl I polymorphism was also determined using a traditional restriction fragment length polymorphism technique and DNA sequencing, and the results showed 100% coincidence with those obtained by our novel method. The method proved to be more rapid and less labour-intensive compared to currently used techniques, and it avoided the use of extensive instrumentals. We assume that this novel method may have a broad utility in clinical and molecular epidemiological studies aimed to elucidate the impact of the Bcl I polymorphism of the glucocorticoid receptor gene either on metabolic disturbances, or various disorders, including cancer treatment and hormone substitution therapies. 相似文献
265.
266.
Schay G Smeller L Tsuneshige A Yonetani T Fidy J 《The Journal of biological chemistry》2006,281(36):25972-25983
The contribution of heterotropic effectors to hemoglobin allostery is still not completely understood. With the recently proposed global allostery model, this question acquires crucial significance, because it relates tertiary conformational changes to effector binding in both the R- and T-states. In this context, an important question is how far the induced conformational changes propagate from the binding site(s) of the allosteric effectors. We present a study in which we monitored the interdimeric interface when the effectors such as Cl-, 2,3-diphosphoglycerate, inositol hexaphosphate, and bezafibrate were bound. We studied oxy-Hb and a hybrid form (alphaFeO2)2-(betaZn)2 as the T-state analogue by monitoring heme absorption and Trp intrinsic fluorescence under hydrostatic pressure. We observed a pressure-dependent change in the intrinsic fluorescence, which we attribute to a pressure-induced tetramer to dimer transition with characteristic pressures in the 70-200-megapascal range. The transition is sensitive to the binding of allosteric effectors. We fitted the data with a simple model for the tetramer-dimer transition and determined the dissociation constants at atmospheric pressure. In the R-state, we observed a stabilizing effect by the allosteric effectors, although in the T-analogue a stronger destabilizing effect was seen. The order of efficiency was the same in both states, but with the opposite trend as inositol hexaphosphate > 2,3-diphosphoglycerate > Cl-. We detected intrinsic fluorescence from bound bezafibrate that introduced uncertainty in the comparison with other effectors. The results support the global allostery model by showing that conformational changes propagate from the effector binding site to the interdimeric interfaces in both quaternary states. 相似文献
267.
Inflammatory breast cancer represents 2-5% of all malignant breast lesions. Its rapid progression, the rather short medical history of the disease is unique and seems to be very typical. The combined modality treatment of inflammatory breast cancer is a special challenge for the medical oncologists. Preoperative chemotherapy is of great importance. After getting fair remission, surgery and radiotherapy should be delivered. With combined modality therapy the 5-year overall survival is about 50%. Knowing more pharmaco-genomic details on the disease and delivering new medicaments the effectiveness of the treatment will be further enhanced. 相似文献
268.
269.
Tamás Juhász Csaba Matta Zoltán Mészár Georgina Nagy Zsolt Szíjgyártó Zsanett Molnár Bernadett Kolozsvári Éva Bakó Róza Zákány 《Central European Journal of Biology》2010,5(5):572-584
We aimed to find a transfection method which provides high efficiency with minimal cytotoxic and/or apoptotic effects for
gene transfer into multilayer primary chondrogenic cell cultures. The pEGFP-C1 plasmid was introduced into the cell culture
and the efficiency of transformation quantified by GFP fluorescence; the resulting nucleofection was effective but resulted
in severe apoptosis. Two liposomal reagents designed to allow transfection into adherent cells did not deliver the plasmids
sufficiently and cartilage formation did not occur. In addition, a third liposomal compound, recommended for transfection
into either adherent or suspension cell cultures, lead to acceptable transfection efficiency but no cartilage formation. When
an amphiphilic reagent was used however, there was acceptable transfection efficiency as well as cartilage formation. The
viability of the cells which were transfected using the amphiphilic reagent remained unaffected but proliferation was severely
diminished, particularly in the presence of GFP. In addition, the amount of cartilage decreased when GFP was expressed, despite
unchanged levels of mRNAs of sox9 and aggrecan core protein, factors reflecting on the efficiency of chondrogenesis. Overexpression of both the constitutively
active delta and gamma isoforms of catalytic subunit of calcineurin, a protein phosphatase described as a positive regulator
of chondrogenesis, decreased protein level of Sox9 and subsequent cartilage formation. In conclusion, we found that amphiphilic
reagent applied prior to the adhesion of cells provides a useful means to transfer plasmids to primary differentiating chondrogenic
cells. 相似文献
270.