食源性生物活性肽调控胃肠激素分泌研究进展

胃肠激素是肠内分泌细胞(EECs)分泌的一大类多肽和胺类物质，在机体食欲调控、胃肠运动、消化酶分泌、血压和血糖控制等诸多方面发挥重要作用。胃肠激素的分泌受膳食因素调控，而食源性生物活性肽(FBPs)是调控胃肠激素分泌的重要膳食因子之一。本文综述近年来FBPs调控胃肠激素分泌的作用机制及研究进展，并对未来研究方向进行展望，以期为FBPs在调控胃肠激素分泌及促进机体健康方面的研究和应用提供参考。     

家电用彩涂钢板耐蚀性研究

使用传统的盐雾试验方法,结合产品用途和特点,采用不同的试样制备方式,对家电用彩涂钢板的耐蚀性进行了较为深入的研究.通过对家电彩涂板平板、划线、切口、折弯、冲压等类型盐雾试验的比较,研究了不同涂层、不同基板、不同镀锌量等对家电彩涂钢板耐蚀性的影响.研究结果表明:随着镀锌量的增加,家电彩涂钢板在耐涂层起泡、折弯处锈蚀、切口腐蚀蔓延等方面的耐蚀性增加;在改进金属漆系列彩涂钢板耐切口腐蚀能力方面,提高基板镀锌量是最有效的措施;随着冲杯力和冲杯深度的增加,彩涂家电钢板的切口耐蚀性降低.     

硫酸盐法蒸煮质量控制的新策略

本文提出了Ｄ因子概念，通过Ｄ因子可以对升温时间和最高蒸煮温度进行预报，从而达到了控制蒸煮质量的目的在生产中进行预报实验，效果显著。     

我国纺丝油剂现状及发展趋势

随着化纤工业的发展,我国纺丝油剂生产增长较快,但与国外公司相比尚未形成竞争优势。本文介绍了我国纺丝油剂生产发展现状,提出了存在的问题及对策。     

混凝土面板堆石坝面板表层止水机械化施工技术

国内外面板堆石坝的面板接缝表层止水通常采取的措施为在预留的V形槽内嵌填柔性填料,并在填料外部设盖板对填料加以保护.若采用手工嵌填,质量不易控制.第二代柔性填料挤出机在一代的基础上进行了改进和完善,其挤出速度以可达到20～120m/h,挤出成形的填料外形美观、内部密实,且通过螺旋挤压加热后,既粘且软,可以很好地与混凝土面和盖板粘接,显著提高了施工质量和施工效率,降低了工人劳动强度.在温泉水电站混凝土面板堆石坝表层止水施工中全面使用,取得了良好效果,具有很好的推广前景.     

贫珠光体型管线钢带状组织对性能影响研究

通过光学显微镜和扫描电子显微镜对贫珠光体型管线钢的带状组织形貌进行观察,发现带状组织主要出现在钢的厚度中心,以伴有少量M/A相的珠光体带为主.带状组织的形成与成分偏析和TMCP工艺有密切关系,受工艺波动带状组织呈现出不同级别.本文通过对管线钢卷板和钢管的工业生产数据的统计分析,以及不同带状组织级别样品的对比试验,发现带...     

Evaluation of Solid-State Fermentation by Ganoderma lucidum Using Soybean Curd Residue

The effects of fermentation conditions on the production of polysaccharides from Ganoderma lucidum using soybean curd residue (SCR) as a substrate were investigated. Based on the optimum conditions of solid-state fermentation, the fermentation time, the inoculum size, and the C/N ratio were optimized by response surface methodology. The optimal fermentation conditions for G. lucidum polysaccharide were determined to be the following: 14.53 % of the inoculum size, 10.49 of the C/N ratio, and 21.18 days incubation. The maximum polysaccharide yield of 48.14?±?1.47 mg/g was obtained in the verification experiment. Furthermore, treatment with 20 μg/mL of G. lucidum polysaccharide from fermented SCR showed significant stimulation for the macrophage proliferation and higher nitric oxide production. Compared with the unfermented soybean curd residue, the total phenolic compounds increased fourfold, and various amino acids were increased significantly in the fermented soybean curd residue. Therefore, a nutritious functional food or food additives could be produced using fermented soybean curd residue.     

The Reactions of Carbon in a Hydrogen Plasma

Acetylene can be directly produced by coal pyrolysis in hydrogen plasma. A key factor affecting acetylene yield is whether the residue solid carbon is able to react with hydrogen to form acetylene after volatile matters released from coal powders pyrolyzed in hydrogen plasma. Reactions of carbon in hydrogen plasma are studied in this article. The study showed that solid carbon could hardly react with hydrogen at temperatures below the sublimation point, while sublimated carbon could easily react with hydrogen at temperatures above sublimation point, and mainly acetylene and other hydrocarbons can be obtained after quenching process.     

新建重载铁路桥梁设计荷载标准的研究

对国内外荷载标准与列车运营模式间的关系进行研究分析,探讨设计活载标准的合理储备,分析国内重载铁路发展的情况,制定重载运营车辆检算模式。基于修正后中-活载(2005)中的ZH图式,从静活载储备、考虑恒载和相关设计参数后储备两方面,对重载列车作用下桥梁结构设计荷载系数的取值进行研究,提出适用于新建重载铁路设计的荷载系数。研究成果可为重载铁路标准规范提供依据。     

Mechanism of microwave-accelerated soy protein isolate–saccharide graft reactions

To investigate the mechanism of microwave-accelerated soy protein isolate (SPI)–saccharide graft reactions, we examined effects of microwave heating (MH) and water-bath heating (WH) on protein structures and reaction properties. Under high-power microwave irradiation, protein disulfide bonds were broken to cause an increase first and a decrease later in free sulfhydryl contents over time, thus inducing subunit disaggregation. And the solvent (water) exposure of hydrophobic core residues was enhanced in MH-treated SPI, which led to protein disaggregation and unfolding and much smaller aggregates in the protein solution. Calculations showed that graft reactions by MH had much lower activation energies than those by WH. Moreover, microwave can reduce the occurrence of caramelization and thus improve the graft reaction selectivity. It is seen that the microwave radiation power strongly influenced the reaction kinetics. Consequently, the results suggest that improvement of microwave-assisted SPI–saccharide graft reactions is mainly due to a thermal microwave effect and therefore the reaction mechanism could be reasonably inferred.