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排序方式: 共有241条查询结果,搜索用时 17 毫秒
31.
Osvaldo D. Delgado M. Alejandra Martínez Carlos M. Abate Faustino Siñeriz 《Biotechnology letters》2002,24(15):1285-1290
An integrative vector was constructed to allow expression of heterologous proteins into the adhB locus of Zymomonas mobilis. As a reporter gene, the ORF of a bright variant of green fluorescent protein from Aequorea victoria (GFPuv) was fused to the adhB strong promoter from Z. mobilis by using a two-step PCR strategy. Z. mobilis recombinant strains that were stably marked by precise gene replacement at adhB locus with a single chromosomal copy of gfpuv. Protein expression was confirmed by fluorescence microscopy and measured by fluorescence spectroscopy, showing high expression levels (12 to 30 times higher than those obtained in E. coli) without affecting the host growth. 相似文献
32.
Addition of caffeine to the recovering medium after mutagenesis ofZymomonas mobilis by N-methyl-N-nitrosoguanidine increased 4-fold the number of auxotrophic mutants obtained. Moreover, while the mutants isolated
without caffeine survived only a few repeated serial transfers on minimal medium supplemented with the required growth factor,
40 % of those obtained in the presence of caffeine were stable. 相似文献
33.
Organic–inorganic perovskites have demonstrated an impressive potential for the design of the next generation of solar cells. Perovskite solar cells (PSCs) are currently considered for scaling up and commercialization. Many of the lab‐scale preparation methods are however difficult to scale up or are environmentally unfriendly. The highest efficient PSCs are currently prepared using the antisolvent method, which utilizes a significant amount of an organic solvent to induce perovskite crystallization in a thin film. An antisolvent‐free method is developed in this work using flash infrared annealing (FIRA) to prepare methylammonium lead iodide (MAPbI3) PSCs with a record stabilized power conversion efficiency of 18.3%. With an irradiation time of fewer than 2 s, FIRA enables the coating of glass and plastic substrates with pinhole‐free perovskite films that exhibit micrometer‐size crystalline domains. This work discusses the FIRA‐induced crystallization mechanism and unveils the main parameters controlling the film morphology. The replacement of the antisolvent method and the larger crystalline domains resulting from flash annealing make FIRA a highly promising method for the scale‐up of PSC manufacture. 相似文献
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36.
Luca Avenali Oli Abate Fulas Julia Sondermann Pratibha Narayanan David Gomez-Varela 《Channels (Austin, Tex.)》2017,11(1):11-19
The ability of sensory neurons to detect potentially harmful stimuli relies on specialized molecular signal detectors such as transient receptor potential (TRP) A1 ion channels. TRPA1 is critically implicated in vertebrate nociception and different pain states. Furthermore, TRPA1 channels are subject to extensive modulation and regulation - processes which consequently affect nociceptive signaling. Here we show that the neuropeptide Nocistatin sensitizes TRPA1-dependent calcium influx upon application of the TRPA1 agonist mustard oil (MO) in cultured sensory neurons of dorsal root ganglia (DRG). Interestingly, TRPV1-mediated cellular calcium responses are unaffected by Nocistatin. Furthermore, Nocistatin-induced TRPA1-sensitization is likely independent of the Nocistatin binding partner 4-Nitrophenylphosphatase domain and non-neuronal SNAP25-like protein homolog 1 (NIPSNAP1) as assessed by siRNA-mediated knockdown in DRG cultures. In conclusion, we uncovered the sensitization of TRPA1 by Nocistatin, which may represent a novel mechanism how Nocistatin can modulate pain. 相似文献
37.
Colabufo NA Abate C Contino M Inglese C Ferorelli S Berardi F Perrone R 《Bioorganic & medicinal chemistry letters》2008,18(6):2183-2187
A potent sigma-2 receptor ligand, known as PB28, was tritium radiolabelled and biologically evaluated. The results showed that [(3)H]PB28 and the corresponding unlabelled PB28 had superimposed pharmacodynamic properties. This radioligand appears as a potential candidate for receptor binding and in living cells assays. 相似文献
38.
Catalytic inactive heme oxygenase-1 protein regulates its own expression in oxidative stress 总被引:1,自引:0,他引:1
Lin QS Weis S Yang G Zhuang T Abate A Dennery PA 《Free radical biology & medicine》2008,44(5):847-855
Heme oxygenase-1 (HO-1) catalyzes the degradation of heme and forms antioxidant bile pigments as well as the signaling molecule carbon monoxide. HO-1 is inducible in response to a variety of chemical and physical stress conditions to function as a cytoprotective molecule. Therefore, it is important to maintain the basal level of HO-1 expression even when substrate availability is limited. We hypothesized that the HO-1 protein itself could regulate its own expression in a positive feedback manner, and that this positive feedback was important in the HO-1 gene induction in response to oxidative stress. In cultured NIH 3T3 cells, transfection of HO-1 cDNA or intracellular delivery of pure HO-1 protein resulted in activation of a 15-kb HO-1 promoter upstream of luciferase as visualized by bioluminescent technology and increased HO-1 mRNA and protein levels. These effects were independent of HO activity because an enzymatically inactive mutant form of HO-1 similarly activated the HO-1 promoter and incubation with HO inhibitor metalloporphyrin SnPP did not affect the promoter activation. In addition, HO-1-specific siRNA significantly reduced hemin and cadmium chloride-mediated HO-1 induction. Furthermore, deletion analyses demonstrated that the E1 and E2 distal enhancers of the HO-1 promoter are required for this HO-1 autoregulation. These experiments document feed-forward autoregulation of HO-1 in oxidative stress and suggest that HO-1 protein has a role in the induction process. We speculate that this mechanism may be useful for maintaining HO-1 expression when substrate is limited and may also serve to up-regulate other genes to promote cytoprotection and to modulate cell proliferation. 相似文献
39.
Hctor A. Cristbal Andr Schmidt Erika Kothe Javier Breccia Carlos M. Abate 《Enzyme and microbial technology》2009,45(6-7):498-506
The psychrotolerant bacterium Shewanella sp. G5 was used to study differential protein expression on glucose and cellobiose as carbon sources in cold-adapted conditions. This strain was able to growth at 4 °C, but reached the maximal specific growth rate at 37 °C, exhibiting similar growing rates values with glucose (μ: 0.4 h−1) and cellobiose (μ: 0.48 h−1). However, it grew at 15 °C approximately in 30 h, with specific growing rates of 0.25 and 0.19 h−1 for cellobiose and glucose, respectively. Thus, this temperature was used to provide conditions related to the environment where the organism was originally isolated, the intestinal content of Munida subrrugosa in the Beagle Channel, Fire Land, Argentina. Cellobiose was reported as a carbon source more frequently available in marine environments close to shore, and its degradation requires the enzyme β-glucosidase. Therefore, this enzymatic activity was used as a marker of cellobiose catabolism. Zymogram analysis showed the presence of cold-adapted β-glucosidase activity bands in the cell wall as well as in the cytoplasm cell fractions. Two-dimensional gel electrophoresis of the whole protein pattern of Shewanella sp. G5 revealed 59 and 55 different spots induced by cellobiose and glucose, respectively. Identification of the quantitatively more relevant proteins suggested that different master regulation schemes are involved in response to glucose and cellobiose carbon sources. Both, physiological and proteomic analyses could show that Shewanella sp. G5 re-organizes its metabolism in response to low temperature (15 °C) with significant differences in the presence of these two carbon sources. 相似文献
40.
Michele Abate Karin Gravare Silbernagel Carl Siljeholm Angelo Di Iorio Daniele De Amicis Vincenzo Salini Suzanne Werner Roberto Paganelli 《Arthritis research & therapy》2009,11(3):235-15
The intrinsic pathogenetic mechanisms of tendinopathies are largely unknown and whether inflammation or degeneration has the
prominent role is still a matter of debate. Assuming that there is a continuum from physiology to pathology, overuse may be
considered as the initial disease factor; in this context, microruptures of tendon fibers occur and several molecules are
expressed, some of which promote the healing process, while others, including inflammatory cytokines, act as disease mediators.
Neural in-growth that accompanies the neovessels explains the occurrence of pain and triggers neurogenic-mediated inflammation.
It is conceivable that inflammation and degeneration are not mutually exclusive, but work together in the pathogenesis of
tendinopathies. 相似文献