油用亚麻可溶性糖、脂肪含量与硬脂酰-酰基载体蛋白脱氢酶基因表达相关性分析     

王树彦  韩冰  周四敏  徐军 《作物杂志》2016,(4):56-61

为研究油用亚麻叶片、果球4个发育阶段硬脂酰-酰基载体蛋白脱氢酶基因(sad)表达水平与可溶性糖含量、脂肪含量之间的关系,以3个已知亚麻酸含量相对不同的油用亚麻品种为试验对象,应用q RTPCR技术对不同发育时期组织中sad基因的相对表达量与可溶性糖含量以及脂肪含量之间的关系进行分析。结果表明,在油用亚麻叶片和果球的不同发育阶段sad基因的表达模式符合正态分布,在品种和时期之间表达量差异明显。可溶性糖的含量在果球和叶片中差异明显,相关性分析结果显示,在sad基因表达量增加时,可溶性糖含量相对减少;脂肪含量与sad基因的表达量呈极显著正相关。油用亚麻中sad基因表达直接影响油用亚麻可溶性糖和脂肪含量,进而影响亚麻油的品质。  相似文献   

天然斜发沸石催化α-蒎烯水合反应研究   总被引：6，自引：3，他引：6  

王亚明  邢思敏  黄若华  魏云波  王辉 《林产化学与工业》1996,16(4):64-68

用两种云南产天然斜发沸石催化α-蒎烯的水合反应，采用程序升温脱附法研究了催化活性与催化剂酸性质间的关系；讨论了反应温度、反应时间及催化剂用量对水合反应的影响，生产物为α-松油醇。  相似文献   

生物炭对污泥-菌渣堆肥腐殖化与重金属钝化的影响     

李思敏  张义竞  唐锋兵  李思雨  王彦飞  许铮 《农业环境科学学报》2022,41(7):1565-1574

为探讨生物炭对市政污泥堆肥腐殖化和重金属钝化的影响,将市政污泥和菌渣按照湿质量比1:0.7进行混合,设置3个堆体进行好氧堆肥:处理组堆体分别添加混料干质量5%和10%的生物炭(记为BC5、BC10);对照组(CK)堆体不添加生物炭。结果表明:添加生物炭可延长高温时间,促进堆肥中富里酸向大分子胡敏酸转变,降低水溶性有机物含量,促进堆体腐熟。添加生物炭的堆体对重金属的钝化效果均优于CK组,BC5对可交换态Cu、Pb钝化效果较好,钝化率分别为78.12%、97.82%,BC10对可交换态Cr、Ni、Zn钝化效果较好,钝化率分别为66.64%、5.88%、19.76%;堆肥后Cu、Pb、Cr残渣态分配率增加量大小顺序为BC10>BC5>CK,Ni、Zn残渣态分配率增加量大小顺序为BC5>BC10>CK。Cu、Cr、Pb、Zn可交换态分配率均与水溶性有机物和富里酸呈极显著正相关(P<0.01),与胡敏酸呈极显著负相关(P<0.01)。研究表明,添加生物炭有利于堆体腐殖化和重金属钝化,且两者存在相关性。  相似文献   

后基因组时代基于选择导入系的水稻设计育种策略     

石英尧§  马赛§  曾威§  郝芷圻  李思敏  王文生  黎珉 《中国农业科技导报》2021,23(11):25-35

近年来,水稻基因组学的发展突飞猛进,但如何将这些研究成果（丰富的基因组变异及功能基因克隆等）有效应用到复杂农艺性状的精准改良仍是设计育种面临的重大挑战和科学难题。经过多年实践证明,选择导入育种（breeding by selective introgression, BBSI）是有效解决这些问题的方法,这是一套基于精准遗传信息进行基因挖掘并同步改良多个复杂性状的设计育种策略。其主要包括：①构建大量携带优异性状的回交导入系群体,作为BBSI的材料平台;②基于全基因组测序和关联分析,构建精准的遗传信息平台;③通过设计“理想目标基因组型（ideal target genomic constitutions, ITGC）”和基因聚合方法,高效培育目标优良品种。介绍了BBSI的发展历程及在分子设计育种中的有效运用,尤其是如何利用分子数量遗传理论和全基因组变异来验证并丰富该策略,计划实施20年来已育成近百个绿色超级稻（green super rice, GSR）新品种,为后基因组时代作物育种的创新发展提供了重要理论和实践参考。  相似文献   

Effects of different sources of carbohydrates on intake,digestibility, chewing,and performance of Holstein dairy cows     

Simin Poorkasegaran  Asadollah Teimouri Yansari 《畜牧与生物技术杂志(英文版)》2014,5(1):6

To investigate the effects of different sources of carbohydrates on intake, digestibility, chewing, and performance, nine lactating Holstein dairy cows (day in milk= 100±21 d; body weight=645.7 ± 26.5 kg) were allotted to a 3 × 3 Latin square design at three 23-d periods. The three treatments included 34.91% (B), 18.87% (BC), and 18.86% (BB) barley that in treatment B was partially replaced with only corn or corn plus beet pulp in treatments BC and BB, respectively. The concentration of starch and neutral detergent soluble carbohydrate varied (22.2, 20.2, and 14.5; 13.6, 15.9, and 20.1% of DM in treatments B, BC, and BB, respectively). Cows in treatment BB showed a higher DMI and improved digestibility of DM, NDF, and EE compared with treatments B or BC. Ruminal pH was higher in cows fed on BB (6.83) compared with those that received B or BC treatments (6.62 and 6.73, respectively). A lower proportion of propionate accompanied the higher pH in the BB group; however, a greater proportion of acetate and acetate: propionate ratio was observed compared with cows fed either on the B or BC diet. Moreover, cows fed on the BB diet showed the lowest ruminal passage rate and longest ruminal and total retention time. Eating time did not differ among treatments, rumination time was greater among cows fed on the BB diet compared with the others, whereas total chewing activity was greater than those fed on BC, but similar to those fed on B. The treatments showed no effect on milk yield. Partially replacing barley with corn or beet pulp resulted in an increase in milk fat and a lower protein concentration. Changing dietary NFC with that of a different degradability thus altered intake, chewing activity, ruminal environment, retention time or passage rate, and lactation performance. The results of this study showed that beet pulp with a higher NDF and a detergent-soluble carbohydrate or pectin established a more consistent ruminal mat than barley and corn, thus resulting in higher mean retention time and chewing activity, whereas no changes in 3.5% FCM and milk fat were observed.  相似文献   

毛竹材声学振动特性研究   总被引：1，自引：0，他引：1  

王思敏  蒋身学 《竹子研究汇刊》2011,30(1)

用共振法对毛竹材分层研究其动态杨氏模量,分析竹青、竹黄、竹节对毛竹材动态杨氏模量的影响,并得出竹材不同层声学振动性能的变化;分析动态杨氏模量与其静态力学性能的关系.结果表明:毛竹材的动态杨氏模量与密度明显线性正相关;竹青部分声速较大,竹黄部分声速较小;对小尺寸竹材试样也可同样采用测试其动态杨氏模量的方法来估测静态力学性能.  相似文献   

加大我国农村财政教育投入刍议     

陈思民 《安徽农业科学》2007,35(13):3990-3991,4002

由于二元结构的影响,我国的农村财政教育投入一直无法满足农村教育的需要,这在一定程度上侵犯了农民及其子女的平等受教育权.并引起一定的社会问题,所以加大农村财政教育投入极为必要.改革开放以来经济的快速发展,使得加大农村财政教育投入成为可能.通过建立中央、省、市、县、乡各级政府按财政收入比例共同分担农村财政教育投入机制,采用"公私伙伴关系"也是筹集农村财政教育投入的途径.  相似文献   

M_9矮化中间砧段对~(32)P运转的影响     

王中英  赵雨明  解思敏  杨佩芳 《园艺学报》1991,(3)

研究表明M_9中间砧段对~(32)P有明显的滞阻作用,生长期限制~(32)P上运,休眠期限制下运。中间砧段内滞存~(32)P较多,影响基砧根系的吸收,试验树全株~(32)P含量低于对照树,抑制了植株接穗部分的营养生长。  相似文献   

Hydrocortisone Reduces Toll-Like Receptor 4 Expression on Peripheral CD14+ Monocytes in Patients Undergoing Percutanoues Coronary Intervention     

Bahador Bagheri  Bahram Sohrabi  Ali Akbar Movassaghpour  Simin Mashayekhi  Afagh Garjani  Mehriar Shokri  Masoud Pezeshkian  Alireza Garjani 《Iranian Biomedical Journal》2014,18(2):76-81

Bacground: Evidence from several lines of investigations suggests that Toll-like receptor 4 (TLR4) is involved in atherosclerosis as a bridge between innate and acquired immunity. Percutaneous coronary intervention (PCI) can trigger inflammation through activation of human TLR4 (hTLR4) on monocytes. Hydrocortisone as an anti-inflammatory and immuno-suppressant agent has multiple mechanisms of action. In this study, we aimed at assessing the effects of hydrocortisone on monocyte expression and activity of hTLR4 in patients underwent PCI. Methods: Blood samples were taken from a total of 71 patients with chronic stable angina who were scheduled for a PCI, before the intervention. Thirty patients received 100 mg hydrocortisone prior to the procedure. Control group was composed of 41 patients underwent PCI without receiving hydrocortisone. Blood collection was repeated 2 and 4 h after PCI. The expression of hTLR4 on the surface of CD14⁺ monocytes and the serum levels of TNF-α and IL-1β were measured using flowcytometry and Sandwich ELISA. Results: Compared with controls, hydrocortisone significantly reduced monocyte expression of hTLR4 in test group (P<0.01). In addition, it had a significant effect on reduction of serum concentrations of TNF-α and IL-1β in test group in a time-dependent manner (P<0.01). Conclusion: In this study, hydrocortisone was able to reduce the hTLR4/CD14 positive monocytes and its related pro-inflammatory cytokines, thus it can decrease inflammatory responses following PCI. Key Words: Toll-like receptor 4, Cytokines, Hydrocortisone  相似文献   

球磨仪-微波消解石墨炉原子吸收法测定土壤中的铅元素     

殷思敏 《绿色科技》2019,(2):63-64,67

采用行星式球磨仪制样、微波消解、石墨炉原子吸收法测定了土壤样品中的铅含量,球磨仪制样颗粒超细且均匀,干净卫生,不存在扬尘污染;微波消解仪操作简便快速,消耗试剂少,密闭消解,酸污染少。结果表明:测定土壤标准样品GSS-22的相对误差为1%,GSS-26相对误差为1.2%,测定实际试样相对标准偏差均值为1.6%,均满足试验要求。  相似文献