Electrocorticogram disturbances detected in rats exposed from early stages of life to residual doses of lindane     

P. Breton  I. Delamanche  F. Goudey Perrière 《Pesticide biochemistry and physiology》2005,81(2):97-104

Functional brain alterations induced by lindane were examined in Rat chronically exposed to low doses of lindane (1 and 2 μg L⁻¹ in drinking water) from conception. Histological and electrophysiological investigations were conducted at 14 weeks of age. Lindane did not induce histological changes. It did not significantly modify the sleep-wakefulness cycle and EEG did not show major alterations. The spectral EEG analysis, by recording cortical variations in both energy spectrum and energy levels of different frequency bands, showed an increase in the 11-15 Hz activity in both groups exposed to lindane. This activity was characterised by spindles well-depicted during slow wave sleep or associated with fast activity during wakefulness and theta activity in paradoxical sleep. These data suggest that chronic exposure to lindane doses as low as 1 μg L⁻¹ in drinking water could lead to central electrophysiological effects possibly involving GABA-benzodiazepine mechanisms.  相似文献   

Influence of acute exposure to a low dose of systemic insecticide fipronil on locomotor activity and emotional behavior in adult male mice     

Mizuki MAEDA  Toshifumi YOKOYAMA  Sayaka KITAUCHI  Tetsushi HIRANO  Youhei MANTANI  Yoshiaki TABUCHI  Nobuhiko HOSHI 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2021,83(2):344

Fipronil (FPN) is a systemic insecticide that antagonizes the gamma-aminobutyric acid type A (GABA_A) receptors in insects. Recently, adverse effects of FPN on mammals have been reported, but most of those were caused by high doses of FPN and additives in the products. We investigated the effects of low-dose pure FPN on the emotional behavior of mice. Nine-week-old male mice conducted behavioral tests 24 hr after FPN administration by gavage at doses of 0.05 or 5 mg/kg based on the no-observed-effect level (NOEL), showed a significant increase in locomotor activity and dose-dependent responses on the time they spent in the central zone in the open field test. Pure FPN below the NOEL dose may affect the emotional behavior of mice.  相似文献   

牛磺酸、γ-氨基丁酸对鲫抗缺氧能力的影响   总被引：8，自引：0，他引：8  

魏智清  杨涓  赵红雪  马瑛 《淡水渔业》2006,36(1):7-10

研究牛磺酸、γ-氨基丁酸对鲫抗缺氧能力的影响,结果表明质量分数5‰、7‰牛磺酸水溶液对鲫抗缺氧能力有显著(P<0.05)和极显著作用(P<0.01),质量分数3‰γ-氨基丁酸水溶液对鲫抗缺氧有显著作用(P<0.05)。实验证明,γ-氨基丁酸、牛磺酸均可提高鲫的抗缺氧能力。  相似文献   

真空充氮及沸水脱咖啡碱工艺对绿茶品质的影响   总被引：1，自引：0，他引：1  

祖峰  陈文品  于丽珺  刘勤晋 《茶叶科学》2007,27(1):19-26

研究探讨了真空充氮和沸水脱咖啡碱工艺对绿茶品质的影响。结果表明：真空充氮和沸水脱咖啡碱工艺都能够显著改变绿茶挥发性风味成分的组成,使其色、香、味以及功能成分发生了一系列变化。单纯真空充氮处理后,茶样风味接受性下降,挥发性成分相对含量总量减少了39%,检出挥发性成分种类减少27种;酸类、呋喃类和其它杂类挥发性成分组成百分比增加,醇类减少。富集γ-氨基丁酸且脱咖啡碱茶样与只经过富集处理茶样相比,有55种挥发性成分相对含量减少了,有28种挥发性成分相对含量增加了,挥发性成分相对含量总量减少了56%。酸类、呋喃类在脱咖啡碱且富集处理茶样中所占百分比要较未脱咖啡碱富集处理茶样低,风味可接受性提高,说明脱咖啡碱加工工艺能改善高γ-氨基丁酸绿茶产品功能组成和风味可接受性。  相似文献   

GABA、牛磺酸和pH值影响蝌蚪耐缺氧能力的研究     

王莉  樊瑞军  魏智清 《水生态学杂志》2008,29(2):71-75

在水中溶解氧一定的条件下, 将蝌蚪放入50 mL密闭三角瓶内, 观察不同质量分数的牛磺酸、GABA 以及水体不同pH 值对蝌蚪耐缺氧能力的影响。结果显示, 质量分数为0. 4% 的GABA水溶液对蝌蚪耐缺氧能力有极显著改善(P < 0. 01) , 0. 3%的GABA 对蝌蚪耐缺氧能力有显著改善(P < 0. 05)。0. 3%的牛磺酸对蝌蚪耐缺氧能力有极显著改善(P < 0. 01) , 0. 1%、0. 2%、0. 4%、0. 5%的牛磺酸对蝌蚪耐缺氧能力有显著改善(P < 0. 05)。实验证明, GABA、牛磺酸均可提高蝌蚪的耐缺氧能力。而0. 2%的B- 丙氨酸可明显减弱牛磺酸的耐缺氧能力。pH值为5. 4、8. 0时可极显著减弱蝌蚪的耐缺氧能力(P < 0. 01), pH 值为712、7. 7时可显著减弱蝌蚪的耐缺氧能力(P < 0. 05) 。  相似文献   

GABA、牛磺酸和pH值影响蝌蚪耐缺氧能力的研究     

王莉  樊瑞军  魏智清 《水生态学杂志》2008,1(6)

在水中溶解氧一定的条件下,将蝌蚪放入50 mL密闭三角瓶内,观察不同质量分数的牛磺酸、GABA以及水体不同pH值对蝌蚪耐缺氧能力的影响.结果显示,质量分数为0.4%的GABA水溶液对蝌蚪耐缺氧能力有极显著改善(P＜0.01),0.3%的GABA对蝌蚪耐缺氧能力有显著改善(P＜0.05).0.3%的牛磺酸对蝌蚪耐缺氧能力有极显著改善(P＜0.01),0.1%、0.2%、0.4%、0.5%的牛磺酸对蝌蚪耐缺氧能力有显著改善(P＜0.05).实验证明,GABA、牛磺酸均可提高蝌蚪的耐缺氧能力.而0.2%的β-丙氨酸可明显减弱牛磺酸的耐缺氧能力.pH值为5.4、8.0时可极显著减弱蝌蚪的耐缺氧能力(P＜0.01),pH值为7.2、7.7时可显著减弱蝌蚪的耐缺氧能力(P＜0.05).  相似文献   

γ-氨基丁酸·黄芪多糖复方对肉雏鸡生长及免疫性能的影响     

朱正生  郁杰  洪伟鸣  王妲妲  秦枫  魏体鳗 《安徽农业科学》2009,35(19):8994-8995

[目的]研究γ－氨基丁酸和黄芪多糖联合施用对肉雏鸡生长和免疫作用的影响。[方法]选用200只健康肉三黄鸡雏鸡,随机分为复方I、Ⅱ、Ⅲ和黄芪多糖及空白对照5个处理组,试验为期42d,观察γ－氨基丁酸和黄芪多糖复方对三黄鸡雏鸡的生长性能及免疫功能的影响。[结果]基础日粮中添加复方3组均能不同程度地提高雏鸡总增重和平均日增重,降低料肉比,与对照组相比差异显著;复方3组和黄芪多糖组在首免后第14天的ND抗体效价与空白对照组相比差异显著,二免后第7、14天差异极显著;T淋巴细胞转化试验显示,复方3组和黄芪多糖组对4周龄雏鸡细胞免疫功能有增强作用,与空白对照组相比差异显著。[结论]γ－氨基丁酸和黄芪多糖共同添加对于改善和提高肉雏鸡的生长和免疫性能有良好的促进作用。  相似文献   

桑叶中γ-氨基丁酸含量及富集方法的研究进展     

冯胜利  肖欢  张以和 《湖南农业科学》2014,(12):7-8

综述桑叶中γ-氨基丁酸（GABA）的含量及富集方法的研究进展,介绍了桑叶品种、叶龄、叶位和不同采摘季节对桑叶中γ-氨基丁酸含量的影响;厌氧、添加外源物、低温冷激、红外线照射等处理可提高桑叶γ-氨基丁酸的含量。桑叶作为一种富含γ-氨基丁酸的蛋白质资源,具有可观的开发前景。在桑叶中γ-氨基丁酸的富集方法,如红外线照射处理、低温冷激处理等方面还有进一步研究的空间。  相似文献   

Possible Anxiolytic Effects of Ivermectin in Rats     

Spinosa Hde S  Stilck SR  Bernardi MM 《Veterinary research communications》2002,26(4):309-321

Ivermectin, a mixture of 22,23-dihydroavermectin B_1a (80%) and B_1b (20%), is produced by Streptomyces avermectilis, an actinomycete. It is a macrocyclic lactone disaccharide, a member of the avermectin family, and is used as an antiparasitic drug. Previous studies performed in our laboratory showed that doramectin, another avermectin drug, interferes with GABAergic-related behaviours, leading to anxiety and seizures. The objective of the present study was to examine the effects of ivermectin (0.5 and 1.0 mg/kg) on the central nervous system of rats, using behavioural models related to GABAergic neurotransmission. A known anxiolytic drug, diazepam, was used as a positive control. Open field and elevated plus-maze behaviours, as well as conflict behaviour to a conditioned response, were assessed. The effects of ivermectin and diazepam in reversing the anxiety induced by picrotoxin was studied. The protective effects of ivermectin on pentylenetetrazole- and picrotoxin-induced seizures were also investigated. In the open field, 1.0 mg/kg ivermectin decreased locomotion frequency at 15 and 60 min of observation, rearing behaviour showed a biphasic effect at 15 and 30 min and duration of immobility was increased in all sessions after 1.0 mg/kg ivermectin. These data suggest anxiolytic or sedative effects. Ivermectin and diazepam both had a tendency to cause an increase both in the number of entries into the open arms and on the time spent in the open arms of an elevated plus-maze. Picrotoxin on its own reduced the number of entries as well as the time spent in the open arms. Both diazepam and ivermectin reversed these effects of picrotoxin. In conflict behaviour analysis, ivermectin and diazepam gave the classic effect of an anxiolytic drug, reversing the conditioned response to shock. Ivermectin protected rats from the convulsant effects of pentylenetetrazole but not from those of picrotoxin. Thus, ivermectin had the pharmacological profile of an anxiolytic drug with GABAergic properties. The lack of effect on seizures induced by picrotoxin suggests that the action of ivermectin is different from that of the benzodiazepine drugs.  相似文献   

Baclofen intoxication in a dog successfully treated with hemodialysis and hemoperfusion coupled with intensive supportive care     

Nancy E. Scott  MS  DVM  DACVECC    Thierry Francey  Dr. med. vet.  DACVIM    Karl Jandrey  DVM  DACVECC 《Journal of Veterinary Emergency and Critical Care》2007,17(2):191-196

Objective: To describe a case of confirmed baclofen intoxication in a dog that was successfully treated with hemodialysis and hemoperfusion (HD/HP) and to report the serum baclofen kinetics. Case summary: A 2.5‐year‐old, 23 kg, spayed female Brittany Spaniel‐mix was treated after ingesting 21‐52 mg/kg of baclofen. The dog was comatose and was receiving manual ventilation at the time of presentation. Extracorporeal HD/HP was started 10 hours after admission. Within 3 hours of starting HD/HP the dog began initiating breaths and was extubated 18 hours after admission. Serial serum samples that were obtained during the first 24 hours of hospitalization were later analyzed for baclofen concentrations. The dog had elevated creatine phosphokinase and liver enzymes that correlated with an agitated recovery period. The dog had thrombocytopenia that resolved by 10 days after presentation. New or unique information provided: HD/HP shortened the baclofen serum elimination half‐life from 5 to 1.5 hours in the initial 2 hours of treatment. The intrinsic elimination rate constant (K_intr) for this dog was 0.138/hour and the total elimination rate constant (K_tot) during the first 2 hours of HD/HP treatment was 0.458/hour. In this dog, HD/HP was an effective method for rapidly decreasing serum baclofen concentration after an acute overdose.  相似文献