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荧光增白剂FB28对甜菜夜蛾围食膜形态的影响 总被引：2，自引：1，他引：1
用含有不同浓度荧光增白剂FB28的饲料饲喂5龄甜菜夜蛾幼虫,解剖取其围食膜,观察荧光增白剂FB28对围食膜的破坏状况。结果表明,1％荧光增白剂FB28处理6h时,甜菜夜蛾围食膜部分降解;0．1％荧光增白剂FB28处理6h时,甜菜夜蛾围食膜仪有微量食物外渗,处理10h时,围食膜降解,食物与围食膜混在一起。说明1％荧光增白剂FB28对甜菜夜蛾围食膜的破坏能力强于0．1％荧光增白剂FB28。 相似文献
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为填补我国在伏马毒素基体标准物质的空白,本试验研制了以玉米粉为基体的伏马毒素FB1标准物质,玉米样品经过筛、加标、冷冻干燥、磨粉、混匀、密封分装后,用超高效液相色谱-串联质谱(UPLC-MS/MS)法检验样品的均匀性、稳定性,幵联合多家实验室对玉米粉中伏马毒素FB1含量定值,同时分析样品的不确定度。样品均匀性经斱差分析法表明F值为1.42,小于临界值F_(0.05),且伏马毒素FB1含量在觃定时间6个月内无明显变化。结果表明,均匀性与稳定性均符合标准物质的要求。样品定值为1475.56μg kg~(–1),不确定度为169.98μg kg~(–1)。该标准物质可替代进口标准物质,用于伏马毒素检测过程中的仪器校准、实验室质量控制和操作人员的水平考核等。 相似文献
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Consumption of whole-wheat based products is encouraged due to their important nutritional elements that benefit human health. However, the use of whole-wheat flour is limited because of the poor processing and end-product quality. Bran was postulated as the major problem in whole wheat breadmaking. In this study, four major bran components including lipids, extractable phenolics (EP), hydrolysable phenolics (HP), and fiber were evaluated for their specific functionality in flour, dough and bread baking. The experiment was done by reconstitution approach using the 24 factorial experimental layout. Fiber was identified as a main component to have highly significant (P < 0.05) and negative influence on most breadmaking characteristics. Although HP had positive effect on farinograph stability, it was identified as another main factor that negatively impacted the oven spring and bread loaf volume. Bran oil and EP seemed to be detrimental to most breadmaking characteristics. Overall, statistical analysis indicates that influence of the four bran components are highly complex. The bran components demonstrate multi-way interactions in regards to their influence on dough and bread-making characteristics. Particularly, Fiber appeared to have a high degree of interaction with other bran components and notably influenced the functionality of those components in whole wheat bread-making. 相似文献
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The effect of defoliation (DEF) alone or combined with hydrogen cyanamide (HC) on dormancy state, fruit quality and yield of Anna apple cultivar was studied. Trees were manually defoliated on three successive dates, November 15th, December 1st and December 15th. The flower buds (FB) entered the endodormancy synchronized with vegetative buds (VB) for most of the treatments. Most of the treatments terminated endodormancy between January 27th and February 8th during the season 2004/2005 and between January 18th and February 8th during the season 2005/2006. The treatments were effective in dormancy release of FB and somewhat with VB. Defoliation on November 15th + HC recorded the lowest chilling accumulation needed to reach 50% bud break. All the treatments exceeded the control considering the percentage of flower (FBB) and vegetative bud break (VBB) either in the lab or at the field. Growing degree hours and the number of days required to reach each stage of fruiting were differed between the two studied seasons. The control and DEF on December 15th exceeded all the treatments regarding initial fruit set percentage (IFS). The defoliation treatments alone gave the highest yield (kg/tree). Defoliation + HC treatments gave the best fruit quality, while the control gave the least values. 相似文献
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菌株FB是1株对小菜蛾Plutella xylostella幼虫具有高毒力的苏云金芽胞杆菌Bacillus thuringiensis （Bt）。本研究通过扫描电子显微镜、大质粒电泳、总蛋白SDS-PAGE及菌株生长特征观察的方式研究了菌株FB特征,克隆得到了基因cry1Ia、cry1Ea、cry1Ab、cry2Ab和vip3Aa全长,依据全基因组测序结果得到了1个cry8基因部分片段,首次在Bt菌株中同时发现基因cry1类和cry8类,这五种基因推导的氨基酸序列与已知基因序列相比,最高相似性分别为99%、98%、99%、100%、99%,而cry8半长基因与已知基因仅为63%。生测结果表明,蛋白Cry1Ia、Cry1Ea和Cry1Ab对小菜蛾幼虫具有较高杀虫活性。 相似文献
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[目的]研究荧光增白剂FB28对甜菜夜蛾围食膜蛋白的影响。[方法]用含有不同浓度的荧光增白剂FB28饲喂5龄甜菜夜蛾幼虫,解剖取其围食膜,SDS-PAGE电泳检测。[结果]FB28活体处理甜菜夜蛾围食膜在4h内高分子量蛋白条带逐渐消失,4-16h甜菜夜蛾围食膜蛋白逐渐恢复正常。[结论]FB28对甜菜夜蛾围食膜蛋白具有影响作用。 相似文献
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Based on the analysis of the phase shift Full Bridge Zero Voltage Switched PWM Converter(FB ZVS PWM converter),a smal signal model is derived,and simulation results of frequency domain and time domain are given.[WT5HZ] 相似文献
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以含有 FB1标准品的乙腈水溶液和FB1污染的玉米为材料，对FB1的辐照降解效果进行研究，并对 FB1的降解产物进行了初步分析。结果表明，辐照处理可以降解乙腈水溶液中的FB1，剂量低于9 kGy的辐照处理对玉米样品中 FB1的降解效果不明显。辐照剂量为9 kGy时，浓度为0.8 mg/ml、10.0μg/ml、1.0μg/ml 及50 ng/ml 的 FB1降解率分别为22.5%、51.0%、59.0%和64.8%；浓度为0.8 mg/ml的 FB1在辐照剂量100 kGy 时的降解率达90%，在辐照剂量为200 kGy时 FBI几乎全部被降解。 LC/MS/MS方法分析未见明显的 FB1降解产物。 相似文献
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