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排序方式: 共有130条查询结果,搜索用时 390 毫秒
1.
Culture filtrates of Talaromyces emersonii UCG 208 grown on beet pulp can convert the polysaccharide components of this agricultural waste to soluble sugars. The saccharification process is facilitated if the pulp is milled or incubated with alkali or peracetic acid before addition of enzyme. However, treatment of unmilled pulp with commercial pectinase prior to incubation with Talaromyces filtrate is also very effective; under suitable conditions, complete hydrolysis of total polysaccharides has been achieved. 相似文献
2.
Production and Partial Purification of Antibiotic Materials Formed by Physarum gyrosum 总被引:2,自引:0,他引:2
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Pure cultures of Physarum gyrosum were grown on agar plates with autoclaved Escherichia coli suspensions as the growth medium. Portions of such agar, after growth of the slime mold, contained diffusible materials that inhibited the growth of Bacillus subtilis, B. cereus, E. coli, Staphylococcus aureus, and Pseudomonas aeruginosa. Paper chromatography of extracts of such cultures revealed at least three different active fractions. Preliminary fractionations increased the specific activity by one order of magnitude, probably in part by removal of inactive material and in part by separating active components. The fractionations also demonstrated the multiplicity of the antibiotic activity. Fractions variously obtained always retarded the growth of the bacterial species listed above. 相似文献
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A.P. Moloney T.J. Hackett P.J. Considine M.P. Coughlan 《Enzyme and microbial technology》1983,5(4):260-264
By a combination of genetic mutation and modification of growth medium the cellulase [see 1,4-(1,3;1,4)-β-d-glucan 4-glucanohydrolase, EC 3.2.1.4 etc.] activity of culture filtrates of Talaromyces emersonii CBS 814.70 has been increased four-fold to approximately 2 U ml?1 and a productivity of 20–25 Ul?1h?1. At 50°C this system was completely stable for at least 24 h. At 60°C in static reaction mixtures 19% of the original activity was lost compared with 21% when mixtures were shaken. At 70°C the loss of activity after 4 h was 64% without shaking and 70% when shaken. The cellulase system from Trichoderma reesei was decidedly less stable than that of Talaromyces emersonii under each of the above conditions. The ability of each enzyme system, separately and together, to digest beet pulp was investigated. 相似文献
4.
Han Dai Lauren Kustigian David Carney April Case Thomas Considine Basil P. Hubbard Robert B. Perni Thomas V. Riera Bruce Szczepankiewicz George P. Vlasuk Ross L. Stein 《The Journal of biological chemistry》2010,285(43):32695-32703
SIRT1 is a protein deacetylase that has emerged as a therapeutic target for the development of activators to treat diseases of aging. SIRT1-activating compounds (STACs) have been developed that produce biological effects consistent with direct SIRT1 activation. At the molecular level, the mechanism by which STACs activate SIRT1 remains elusive. In the studies reported herein, the mechanism of SIRT1 activation is examined using representative compounds chosen from a collection of STACs. These studies reveal that activation of SIRT1 by STACs is strongly dependent on structural features of the peptide substrate. Significantly, and in contrast to studies reporting that peptides must bear a fluorophore for their deacetylation to be accelerated, we find that some STACs can accelerate the SIRT1-catalyzed deacetylation of specific unlabeled peptides composed only of natural amino acids. These results, together with others of this study, are at odds with a recent claim that complex formation between STACs and fluorophore-labeled peptides plays a role in the activation of SIRT1 (Pacholec, M., Chrunyk, B., Cunningham, D., Flynn, D., Griffith, D., Griffor, M., Loulakis, P., Pabst, B., Qiu, X., Stockman, B., Thanabal, V., Varghese, A., Ward, J., Withka, J., and Ahn, K. (2010) J. Biol. Chem. 285, 8340–8351). Rather, the data suggest that STACs interact directly with SIRT1 and activate SIRT1-catalyzed deacetylation through an allosteric mechanism. 相似文献
5.
The kiwifruit vine is a species which has been newly introducedinto cultivation and little is known of its comparative physiologyand anatomy. In this study we found that fibrous, 'magnolioid'roots, which have undergone secondary vascular development butwhich retain the cortex and develop a suberized epidermis, comprisethe greater part of the root system (95% of total length). Newlyinitiated roots with primary development conform to norms establishedin other woody plant species. However, the structural roots,like the fibrous roots, also retain a cortex and phellodermwhich is initiated by hypodermal cells within the cortex andnot by the pericycle which is the common progenitor tissue inother species. This phellogen produces new cells centrifugallyonly. The cortex is a relatively small component of the structuralroot and the bulk of the tissue is vascular in origin, as inthe roots of other plant species. The endodermis is retainedand continues to divide periclinally to accommodate the increasein circumference with growth.Copyright 1993, 1999 Academic Press Actinidia deliciosa, root anatomy, ontogony, histochemistry, exodermis, endodermis 相似文献
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Molinari AJ Trybulski EJ Bagli J Croce S Considine J Qi J Ali K Demaio W Lihotz L Cochran D 《Bioorganic & medicinal chemistry letters》2007,17(21):5796-5800
Small molecule agonists and antagonists of the V(2)-vasopressin receptor have been discovered and have undergone clinical trials. In conjunction with these discovery programs, the synthesis and biological testing of various metabolites associated with these clinical targets were actively pursued. We now report the results of our synthetic efforts and the corresponding biological data generated for several of the metabolites of WAY-151932 and CL-347985 (Lixivaptan). 相似文献
9.
Karlia Meitha Dennis Konnerup Timothy D. Colmer John A. Considine Christine H. Foyer Michael J. Considine 《Annals of botany》2015,116(4):703-711
Background and Aims Plants regulate cellular oxygen partial pressures (pO2), together with reduction/oxidation (redox) state in order to manage rapid developmental transitions such as bud burst after a period of quiescence. However, our understanding of pO2 regulation in complex meristematic organs such as buds is incomplete and, in particular, lacks spatial resolution.Methods The gradients in pO2 from the outer scales to the primary meristem complex were measured in grapevine (Vitis vinifera) buds, together with respiratory CO2 production rates and the accumulation of superoxide and hydrogen peroxide, from ecodormancy through the first 72 h preceding bud burst, triggered by the transition from low to ambient temperatures.Key Results Steep internal pO2 gradients were measured in dormant buds with values as low as 2·5 kPa found in the core of the bud prior to bud burst. Respiratory CO2 production rates increased soon after the transition from low to ambient temperatures and the bud tissues gradually became oxygenated in a patterned process. Within 3 h of the transition to ambient temperatures, superoxide accumulation was observed in the cambial meristem, co-localizing with lignified cellulose associated with pro-vascular tissues. Thereafter, superoxide accumulated in other areas subtending the apical meristem complex, in the absence of significant hydrogen peroxide accumulation, except in the cambial meristem. By 72 h, the internal pO2 gradient showed a biphasic profile, where the minimum pO2 was external to the core of the bud complex.Conclusions Spatial and temporal control of the tissue oxygen environment occurs within quiescent buds, and the transition from quiescence to bud burst is accompanied by a regulated relaxation of the hypoxic state and accumulation of reactive oxygen species within the developing cambium and vascular tissues of the heterotrophic grapevine buds. 相似文献
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