水分胁迫对三种木麻黄小枝活性氧伤害的研究

对三种木麻黄进行水分干旱胁迫处理。结果表明，水分胁迫使木麻黄小枝的相对含水量ＲＷＣ和叶水势ΨＴ下降。木麻黄小枝的Ｏ２＾－产生速率随水分胁迫处理强度加大而增加。ＭＤＡ含量的变化趋势与Ｏ２＾－产生速率的变化趋势相似，ＳＯＤ、ＰＯＤ和ＣＡＴ的活性水平也与Ｏ２＾－的变化相一致，说明木麻黄小枝的水分胁迫损伤，是由Ｏ２＾－引发膜脂过氧化，致使ＭＤＡ含量增加，破坏了细胞膜系统所致，综合结果表明，普通木麻黄具有较     

The effects of vitamin A nutritional status on microsomal lipid peroxidation and α-tocopherol level in rat liver

Summary In vitamin A-deficient rats, liver glutathione peroxidase activity was decreased, -tocopherol content was strongly enhanced, but microsomal liquid peroxidation remained unchanged.     

核黄素合剂对游泳训练小鼠体内自由基的保护作用

以昆明种小白鼠为实验对象，观察了核黄素合剂对运动训练小鼠体内自由基的保护作用．将小鼠（４０ 只）随机分成３ 组．对照组１０ 只（普通饲料、正常饮水、自由活动），实验组Ⅰ１５ 只（普通饲料、正常饮水、运动训练），实验组Ⅱ１５ 只（普通饲料、正常饮水、运动训练、核黄素合剂）．结果表明：实验组Ⅱ小鼠全血、肝脏、肌肉的超氧化物歧化酶（ＳＯＤ）活力及还原型谷胱甘肽（ＧＳＨ）含量明显高于实验组Ⅰ（Ｐ＜０．０１）；而肝脏、肌肉的脂质过氧化物丙二醛（ＭＤＡ）含量则明显低于实验组Ⅰ（Ｐ＜ ０．０１）．提示核黄素合剂具有增强小鼠机体抗氧化酶活力，保护体内自由基的作用．     

CAT在花瓣衰老过程中的作用

紫叶桃(A．pemicaf．alroptnlmrea sohueid)、月季(R．chinensis jaca)的花辩在自然衰老过程中，过氧化氢酶(CAT)活性下降，脂质过氧化产物丙二醛(MDA)含量上升，本文通过对这两种物质之间相关性的研究，探讨了CAT在花瓣衰老中的作用。     

茯苓与有氧运动联合干预对大鼠动脉粥样硬化进程的影响

研究目的：观察茯苓配合有氧运动对大鼠动脉粥样硬化形成的影响,为开发新的动脉粥样硬化防治方法提供理论依据.方法：60只雄性SD大鼠随机平均分为空白组（C组）、高脂组（HC组）、药物组（M组）、生理盐水组（SC组）和联合干预组（ME组）,进行10周干预.HE染色法观察主动脉弓管壁形态学变化;酶法测定血浆TG、TC、LDL-...     

镍对菠菜离体叶片衰老的调节

取生长一致的菠菜第３、４叶片置于１０－３ｍｏｌ／ＬＮｉＳＯ４中，２８℃暗处理４８ｈ，然后测定各项生理指标。结果表明：镍阻抑了叶片在衰老过程中超氧物歧化酶（ＳＯＤ）活性的下降和抗坏血酸（ＡＳＡ）氧化酶活性的上升，ＡＳＡ、蛋白质和叶绿素含量的下降得到延缓，降低了膜脂过氧化程度，从而延缓了菠菜叶片的衰老。     

钌卟啉作为双功能模拟酶的研究

以３种钌卟啉［Ｒｕ（ＴＰＰ）（ＣＯ），Ｒｕ（ＯＥＰ）（ＣＯ），Ｒｕ（４－Ｃｌ－ＴＰＰ）（ＣＯ）］作为超氧化物歧化酶（ＳＯＤ）和过氧化氢酶（ＣＡＴ）双功能模拟酶。核黄素－蛋氨酸光照法证实它们在１０＾６￣１０＾５ｍｏｌ·Ｌ＾－１浓度范围内有清除Ｏ２·的作用；分光光度法证实它们能催化Ｈ２Ｏ２的分解，且分解率随浓度增大而增大；用小鼠肝匀浆法测定Ｒｕ（ＴＰＰ）（ＣＯ）、ＳＯＤ和ＣＡＴ，均表明具有较好的抗脂质     

氧自由基和牛磺酸在家兔休克再灌注损伤中的作用

探讨氧自由基 (OFR)在失血性休克再灌注损伤中的作用及牛磺酸的保护效应。健康家兔 2 4只随机分为 3组(n =8) :对照组、单纯休克组、牛磺酸治疗组 ;采用失血性休克再灌注损伤模型。连续观察休克前 ,休克 1.5h ,再灌注 1h、2h、3h时血浆超氧化物歧化酶 (SOD)活性、丙二醛 (MDA)含量、乳酸脱氢酶 (LDH)活性的动态变化 ;并测定再灌注 3h时心、肺组织MDA含量和SOD活性。结果显示 ,1)单纯休克组再灌注各时限MDA含量、LDH活性显著升高 ;SOD活性显著下降。 2 )再灌注 3h时心、肺组织MDA含量显著升高 ;SOD活性显著下降。 3)牛磺酸 (40mg·kg-1,iv)可减轻再灌注各时限上述指标的变化 (均P <0 .0 1)。提示OFR介导了休克再灌注损伤 ,牛磺酸对休克再灌注损伤的保护作用可能与减少OFR的生成和促进自由基的清除有关。     

Oxidative modifications of low-density lipoproteins (LDL) by the human endothelial cell line EA.hy 926

Modifications of LDL by the EA.hy 926 cell line were compared to those generated by human umbilical vein endothelial cells (HUVEC). Thiobarbituric acid reactive substances (TBARS) index values (TBARS sample/TBARS cell-free control ratio) were 2.64±0.18 (m±SE, n=11) and 3.12±0.24 (n=11), for HUVEC and EA.hy 926, respectively. The percentage of the most electronegative modified LDL fraction (fraction C), assessed by using an ion-exchange chromatographic method based on fast protein liquid chromatography (FPLC), represented 14±3% (n=34) and 22±13% (n=10) of total modified LDL in HUVEC and EA.hy 926, respectively. LDL modified by both cell lines showed increased agarose electrophoretic mobility and apo B100 fragmentation on SDS-PAGE. None of the results were significantly different between the two cell lines. Superoxide anion production was 0.12±0.04 (n=11) and 0.07±0.01 nmol/min/mg cell protein (n=11) in HUVEC and EA.hy 926, respectively. Cell-specific effects on LDL were abrogated in cysteine-free medium. Moreover, cell-modified LDL were similarly degraded by J774 macrophage-like cells. We conclude that EA.hy 926 cells are a good model for investigating endothelial cell-induced modifications of LDL. Advantages include ready availability and less individual variability than with HUVEC.     

Lipid peroxidation,low-level chemiluminescence and regulation of secretion in the mammary gland

In mammary explants of lactating mice, changes in the intensity of chemiluminescence (CL) were observed after the addition to the incubation medium of hormones and mediators that are involved in the regulation of secretion: oxytocin, acetylcholine, epinephrine and norepinephrine. A 15-min period of treatment with oxytocin, epinephrine or norepinephrine changed the level of thiobarbituric acid-reactive substances (TBARS). Two mammary explants, one of which was treated with oxytocin, acetylcholine, epinephrine or norepinephrine, were found to interact even when separated by a quartz glass wall. Analysis of the level of TBARS formation in these two explants showed that the observed interactions might be connected with light emission resulting from lipid peroxidation (LP) processes. The possible role of LP and low-level CL in the regulation of mammary gland secretion is discussed.