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排序方式: 共有124条查询结果,搜索用时 15 毫秒
1.
Angel B. Encarnacion Fernand Fagutao Orapint Jintasataporn Wanchai Worawattanamateekul Ikuo Hirono Toshiaki Ohshima 《Food research international (Ottawa, Ont.)》2012,45(1):232-237
This report investigated the melanosis-inhibiting properties of crude water soluble extract from the base and fruiting body waste of an edible mushroom (Flammulina velutipes) containing 9.13 ± 2.03 mg/mL 2-thiol-l-histidine-betaine (ergothioneine, ESH). Immersion of live full-grown black tiger shrimp (Penaeus monodon) and Pacific white shrimp (Litopenaeus vannamei) in a 0.5% w/v solution of mushroom extract for 1 h significantly decreased polyphenoloxidase (PPO) activity in shrimp hemolymph and expression of the prophenoloxidase (proPO) gene in hemocytes. Consequently, the development of melanosis in the treated shrimp during ice storage was prevented. Treatment with a 0.05% w/v solution of sodium sulfite and 4-hexyl-1,3-benzenediol had a similar effect. Enzyme assays showed that ESH is a non-competitive inhibitor. It is proposed that ESH possibly interacts directly with Cu2+ at the putative binding sites of PPO and proPO, based on copper-chelating activity analyses, thus preventing melanosis in the shrimp. This study indicated that application of ESH-rich F. velutipes mushroom extract from trimming waste is an effective natural alternative to synthetic melanosis-inhibiting agents to prevent postmortem melanosis in shrimp. 相似文献
2.
Three primary approaches to electric rail traction are discussed. These are the direct current system, single-phase special frequency system, and three-phase systems. 相似文献
3.
Grainger Jonathan; Granier Jean-Pierre; Farioli Fernand; Van Assche Eva; van Heuven Walter J. B. 《Canadian Metallurgical Quarterly》2006,32(4):865
Six experiments apply the masked priming paradigm to investigate how letter position information is computed during printed word perception. Primes formed by a subset of the target's letters facilitated target recognition as long as the relative position of letters was respected across prime and target (e.g., "arict" vs. "acirt" as primes for the target "apricot"). Priming effects were not influenced by whether or not absolute, length-dependent position was respected (e.g., "a-ric-t" vs. "arict"/"ar-i-ct"). Position of overlap of relative-position primes (e.g., apric-apricot; ricot-apricot; arict-apricot) was found to have little influence on the size of priming effects, particularly in conditions (i.e., 33 ms prime durations) where there was no evidence for phonological priming. The results constrain possible schemes for letter position coding. (PsycINFO Database Record (c) 2011 APA, all rights reserved) 相似文献
4.
Stephane Dassy Hughes Wiame Fernand C. Thyrion 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1994,59(2):149-156
Esterification of lactic acid with butanol catalysed by cation-exchange resin was carried out in a batch reactor in dioxane and toluene. The reaction rate was found to be first order with respect to catalyst and acid concentrations. The inhibiting effect of water and butanol has been evaluated. The rate data were correlated with a kinetic model based on inhibition by water and butanol. 相似文献
5.
Donohue KD Huang L Georgiou G Cohen FS Piccoli CW Forsberg F 《IEEE transactions on ultrasonics, ferroelectrics, and frequency control》2003,50(6):724-729
Benign and malignant breast tissue classification is examined for generalized-spectrum parameters computed from RF ultrasound data when a preclassification of subregions based on general scattering properties is performed. Results using a clinical database of 84 patients show statistically significant improvements (over 10% in receiver operation characteristic (ROC) areas) when only coherent scatterer subregions are used as compared to using all subregions within the region of interest. 相似文献
6.
A three-dimensional finite element model is utilized to capture the effects of plasticity-induced crack closure (PICC) on an adhesively bonded patch repair of a cracked plate. To accurately capture the PICC process the choice of material model employed is of significant importance, therefore this paper considers a relatively new model, the Ellyin–Xia model. The paper shows that the PICC phenomenon is beneficial to the repair. 相似文献
7.
对于计算机信息系统受到攻击基本上可以分为基于CPU和I/O控制器这两种。对于CPU的攻击已经被深入研究,各种成熟的对策也被广泛的应用。但是对于I/O控制器攻击的研究非常缺乏有效的保护机制。为了研究关于I/O控制器的攻击,使用FPGA可编程技术设计和实现了一款PCI Express总线的平台。平台能产生任意种类的关于PCI Express事务层的信息包,为研究各类I/O控制器的攻击提供了基础。 相似文献
8.
Lemaire Patrick; Lecacheur Mireille; Farioli Fernand 《Canadian Metallurgical Quarterly》2000,54(2):141
Examined strategic aspects of children's performance in computational estimation. 23 5th-grade children (aged 10 yrs old) were asked to provide estimates of 48 3- by 3-digit addition problems. After each problem, Ss were asked to say how they found the solution. Verbal protocols, speed, and accuracy were collected for each problem so as to identify which computational estimation strategy is used on each trial, and how each strategy is used, selected, and executed. The results show that children used 4 strategies: rounding with decomposition, rounding without decomposition, truncation, and compensation. Strategies appeared to differ in frequency and effectiveness. Finally, children chose strategies in an adaptive way so as to obtain fast and accurate performance. Implications of these findings for understanding children's computational estimation performance and strategies in numerical cognition in general are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
9.
Sanaz Paran Tuyen Vu Fernand Diaz Chris S. Edrington Touria El-Mezyani 《电力部件与系统》2019,47(16-17):1437-1449
AbstractPower scheduling of distributed storage devices and renewable energy resources in microgrids is crucial for their reliable and optimal operation. Conventionally, the power scheduling problem is solved with a centralized energy management control, which has access to all the information from the overall system. This type of control has limitations related to computational burden, communication latencies, and missing information. Therefore, the primary objective of this paper is to propose a distributed energy management strategy, to reduce the operational cost of microgrids, and to enhance the computation time. The strategy is formulated based on the model predictive control method since it allows the control action in the current time-step to be optimized while taking into account the future time-steps. Outputs of the energy management system are the optimal power references generated for all energy resources based on the system’s demand, constraints, and objective functions. To illustrate the effectiveness of the distributed model predictive control, the proposed algorithm is validated through simulation, on a microgrid candidate via MATLAB/Simulink, and controller hardware-in-the-loop experiment on a LabVIEW platform using National Instruments control devices (myRIO). The results will show the computation time in the distributed IEM method is improved compared to centralized IEM. Additionally, the results will show the robustness of the distributed IEM in the plug and play scenario. 相似文献
10.
Several authors have hailed intuition as one of the defining features of expertise. In particular, while disagreeing on almost
anything that touches on human cognition and artificial intelligence, Hubert Dreyfus and Herbert Simon agreed on this point.
However, the highly influential theories of intuition they proposed differed in major ways, especially with respect to the
role given to search and as to whether intuition is holistic or analytic. Both theories suffer from empirical weaknesses.
In this paper, we show how, with some additions, a recent theory of expert memory (the template theory) offers a coherent
and wide-ranging explanation of intuition in expert behaviour. It is shown that the theory accounts for the key features of
intuition: it explains the rapid onset of intuition and its perceptual nature, provides mechanisms for learning, incorporates
processes showing how perception is linked to action and emotion, and how experts capture the entirety of a situation. In
doing so, the new theory addresses the issues problematic for Dreyfus’s and Simon’s theories. Implications for research and
practice are discussed.
相似文献
Fernand GobetEmail: |