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排序方式: 共有173条查询结果,搜索用时 15 毫秒
11.
J. Eduardo Fajardo Rojan Shrestha Nelson Gil Adam Belsom Silvia N. Crivelli Cezary Czaplewski Krzysztof Fidelis Sergei Grudinin Mikhail Karasikov Agnieszka S. Karczyńska Andriy Kryshtafovych Alexander Leitner Adam Liwo Emilia A. Lubecka Bohdan Monastyrskyy Guillaume Pagès Juri Rappsilber Adam K. Sieradzan Celina Sikorska Esben Trabjerg Andras Fiser 《Proteins》2019,87(12):1283-1297
With the advance of experimental procedures obtaining chemical crosslinking information is becoming a fast and routine practice. Information on crosslinks can greatly enhance the accuracy of protein structure modeling. Here, we review the current state of the art in modeling protein structures with the assistance of experimentally determined chemical crosslinks within the framework of the 13th meeting of Critical Assessment of Structure Prediction approaches. This largest-to-date blind assessment reveals benefits of using data assistance in difficult to model protein structure prediction cases. However, in a broader context, it also suggests that with the unprecedented advance in accuracy to predict contacts in recent years, experimental crosslinks will be useful only if their specificity and accuracy further improved and they are better integrated into computational workflows. 相似文献
12.
The formation of nonenzymatic glycosylation products appears to be a link between chronic hyperglycaemia and long-term diabetic complications. However, little is known concerning the glycation-induced modifications in the structure and conformation of proteins, which possibly underlie their altered functional characteristics. This study conveys a direct evidence for and compares the glucose-induced modifications in the conformation of three proteins with various half-lives: bovine serum albumin, human haemoglobin and bovine tendon collagen. These proteins incubated in vitro with glucose in various media containing optionally EDTA and Fe2+ ions contained up to 4-10 times as much attached glucose as did their relevant controls, and the extent of glycation was the highest in the samples incubated under air or in the absence of EDTA. The fluorescence and ESR data indicate that the Trp in albumin molecule, given albumin glycation-induced structural modifications, became more exposed to water surrounding solution whereas the Trp residues of haemoglobin remained shielded from water; also collagen fluorescence derived from the supposedly newly formed covalent crosslinks is vastly increased, and particularly when collagen was glycated under air or in the presence of Fe2+ ions. Possible mechanisms underlying the increased mobility of selected protein domains and glycation-mediated alterations in protein conformation are considered and discussed. 相似文献
13.
Lubiński J Górski B Kurzawski G Jakubowska A Cybulski C Suchy J Debniak T Grabowska E Lener M Nej K 《Acta biochimica Polonica》2002,49(3):571-581
On the basis of literature data and own experience the authors review the current knowledge about the molecular basis of inherited predispositions for tumors. They hypothesize that in the near perspective 5-10 years studies using existing registry data/material and the latest novel technology will allow the identification of the molecular background for the majority of hereditary cancers which will have enormous practical consequences especially for the prevention of malignancies. 相似文献
14.
Regulation of apoptosis by the ubiquitin and proteasome pathway 总被引:6,自引:1,他引:5
Wójcik C 《Journal of cellular and molecular medicine》2002,6(1):25-48
Regulated proteolysis plays important roles in cell physiology as well as in pathological conditions. In most of the cases, regulated proteolysis is carried out by the ubiquitin- and proteasome-dependent proteolytic system, which is also in charge of the bulk of cytoplasmic proteolysis. However, apoptosis or the process of programmed cell death is regulated by a different proteolytic system, i.e . by caspases, a family of specialized cysteine proteases. Nevertheless, there is plenty of evidence of a crosstalk between the apoptotic pathways and the ubiquitin and proteasome system, whose function in apoptosis appears to be very complex. Proteasome inhibitors induce apoptosis in multiple cell types, while in other they are relatively harmless or even prevent apoptosis induced by other stimuli. Proteasomes degrade specific proteins during apoptosis, but on the other hand some components of the proteasome system are degraded by caspases. The knowledge about the involvement of the ubiquitin- and proteasome-dependent system in apoptosis is already clinically exploited, since proteasome inhibitors are being tested as experimental drugs in the treatment of cancer and other pathological conditions, where manipulation of apoptosis is desirable. 相似文献
15.
16.
Czaplewski C Rodziewicz-Motowidło S Dabal M Liwo A Ripoll DR Scheraga HA 《Biophysical chemistry》2003,105(2-3):339-359
The multibody contribution to the potential of mean force (PMF) of hydrophobic association of four methane molecules in water was investigated by means of umbrella-sampling molecular dynamics. Two systems were considered: (i). a trigonal pyramid with three methane molecules at contact distance forming a fixed base, the fourth molecule being placed on the top with variable distance from the base; and (ii). a regular uniformly expanding tetrahedron. Methane-methane distances as far as 12.5 A, i.e. beyond the second solvent-separated minimum of the PMF, were considered to address the baseline problem. In contrast to the small effect in the three-body case studied previously (Protein Sci 9 (2000) 1235), the multibody contribution was found to amount to approximately 0.2 kcal/mol per methane-methane pair, or approximately 25% of the depth of the contact minimum in the PMF. The main effect of the multibody contribution to the PMF is a reduction of the height of the barrier between the contact and solvent separated minima and a narrowing of the region of its maximum, while the region of the contact minimum is affected only weakly. The reduction of the barrier is due to four-body contributions. The cooperative contributions to the PMF agree very well with those computed from the molecular surface of the systems under consideration, which further supports earlier observations that the molecular surface can be used with good accuracy to describe the energetics of hydrophobic association. 相似文献
17.
Joanna Malicka Magorzata Groth Cezary Czaplewski Regina Kasprzykowska Adam Liwo Leszek ankiewicz Wieslaw Wiczk 《Letters in Peptide Science》1998,5(5-6):445-447
The probable conformations of two cyclic enkephalin analogs, DNS-cyclo[D-Dab-Gly-Trp-Leu] (I) and DNS-cyclo[D-Dab-Gly-Trp-D-Leu] (II) (DNS = dansyl), were determined by combining the results of NOE, vicinal coupling constant and fluorescence energy transfer measurements with theoretical calculations. The common feature of the conformations for both peptides is the presence of a -turn at residues 2 and 3. 相似文献
18.
Cezary Czaplewski Rajmund Kamierkiewicz Jerzy Ciarkowski 《Letters in Peptide Science》1998,5(5-6):333-335
We predict some essential interactions between the V2 vasopressin renal receptor (V2R) and its agonists [Arg8]vasopressin (AVP) and [D-Arg8]vasopressin (DAVP), and the non-peptide antagonist OPC-31260. V2R controls antidiuresis and belongs to the superfamily of heptahelical transmembrane (7TM) G-protein-coupled receptors (GPCRs). The receptor was built, the ligands were docked and the structures relaxed using advanced molecular modeling techniques. Docked agonists and antagonists appear to prefer similar V2R compartments. A number of receptor amino acid residues are indicated, mainly in the TM3–TM7 helices, as potentially important in ligand binding. Many of these residues are invariant for either the GPCR superfamily or the subfamily of related (vasopressin V2R, V1aR and V1bR and oxytocin OR) receptors. Moreover, some of the equivalent residues in V1aR have already been found critical for ligand affinity [Mouillac et al., J. Biol. Chem., 270 (1995) 25771]. 相似文献
19.
Joanna Malicka Małgorzata Groth Cezary Czaplewski Regina Kasprzykowska Adam Liwo Leszek Łankiewicz Wieslaw Wiczk 《International journal of peptide research and therapeutics》1998,5(5-6):445-447
Summary The probable conformations of two cyclic enkephalin analogs, DNS-cyclo[d-Dab-Gly-Trp-Leu] (I) and DNS-cyclo[d-Dab-Gly-Trp-d-Leu] (II) (DNS=dansyl), were determined by combining the results of NOE, vicinal coupling constant and fluorescence energy transfer
measurements with theoretical calculations. The common feature of the conformations for both peptides is the presence of a
β-turn at residues 2 and 3. 相似文献
20.
Jolanta Szenajch Gabriel Wcislo Jee-Yeong Jeong Cezary Szczylik Laurie Feldman 《生物化学与生物物理学报:癌评论》2010
Recombinant human erythropoietin (rhEPO) has been used clinically to alleviate cancer- and chemotherapy-related anemia. However, recent clinical trials have reported that rhEPO also may adversely impact disease progression and survival. The expression of functional EPO receptors (EPOR) has been demonstrated in many human cancer cells where, at least in vitro, rhEPO can stimulate cell growth and survival and may induce resistance to selected therapies. 相似文献