Effect of Ultraviolet Irradiation on Thermal Gelation of Muscle Pastes

The role of the actomyosin denaturation in the thermal gelation of muscle pastes by ultraviolet (UV) irradiation was studied. The pastes and actomyosins were obtained from sardine, beef, and pork. When UV irradiation (2,700 μW/cm²) from a photochemical mercury-arc lamp was applied to the pastes, the surface gel strength of thermal gels markedly increased with prolonged irradiating time. The effect of UV at 360 nm on the sardine gels was superior to that at 250 nm. UV denaturation of actomyosin ATPases revealed that activation of Mg-ATPase and decrease of EDTA-ATPase occurred simultaneously. The possible role of UV irradiation in the thermal gelation was discussed from the point of actomyosin ATPases.     

国内外通信协议的发展现状和动向

本文主要介绍了国内外开放式通信技术的现状及探讨其今后的发展方向。     

Effect of Pressure Treatment on Actomyosin ATPases from Flying Fish and Sardine Muscles

The effect of pressure treatment (1 atm ～ 5000 atm) on flying fish and sardine actomyosin ATPases was studied from the standpoint of interaction between myosin and actin. The activities of actomyosin Mg-ATPases markedly decreased and those of the EDTA-ATPases rapidly increased with prolonged pressure treatment at 3000 atm and 5000 atm. Changes in activities of F-actin plus pressure-treated myosin Ca-ATPases showed results similar to those of pressure-treated actomyosin Ca-ATPases, while myosin plus pressure-treated F-actin resulted in decreased Mg-ATPase activity and increased EDTA-ATPase activity.     

隧道墙附近火源火灾热气流的计算流体动力学

运用CFD进行数字模拟，以了解纵向通风隧道内热烟气流的特性。通过模拟发现对火源进行模拟非常重要，热烟气流特性受火源位置的影响很大，并且对火源模拟方法很敏感。火源生成的火焰区是燃烧引起的化学反应区域。即使火源附近的木垛排列完好，也很难在考虑这些化学反应条件下模拟热生成区域。建议考虑纵向通风隧道内火焰形状并对它进行数字模拟。模拟结果与试验结果非常吻合。试验证明，在纵向通风隧道内，热烟气流从靠近墙体火源处顺风向隧道中心蔓延。数字模拟结果发现，火灾羽流造成的螺旋上升空气会在墙体和羽流之间形成一个涡流区。     

SIZE DISTRIBUTION OF CLUSTERS INHERENT IN RANDOM DISPERSIONS OF EQUAL SPHERES WITH A COAGULATION RADIUS

Abstract

The spatial structure of a computer-simulated random dispersion of equal spheres is investigated. The sphere of influence, i.e. the coagulation radius, is assumed for each particle without any particle movement. If the distance between sphere centers lies within the coagulation radius, the spheres are regarded as being connected to each other to form a cluster. Various sizes of clusters exist inherently in the random dispersion. The effects of the coagulation radius and the bulk-mean particle volume fraction on the size distribution of clusters are discussed theoretically and experimentally.