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试验旨在研究花生多糖的体内外抗氧化作用。体外以邻苯三酚自氧化体系检测不同浓度花生多糖对羟自由基和超氧阴离子的清除作用。以含有花生多糖终浓度分别为0.25、0.50、2.00 g/L的培养基饲喂果蝇,研究花生多糖对果蝇体内抗氧化力的作用及延长果蝇寿命作用。5 g/L的花生多糖对羟基自由基清除率达到了86.39%,4 g/L的花生多糖对超氧阴离子自由基清除率达到了90.29%。0.50 g/L花生多糖能显著降低果蝇体内MDA含量,提高果蝇的总抗氧化力。0.5 g/L花生多糖显著提高了果蝇的平均寿命,各剂量花生多糖极显著提高了果蝇的最高寿命。结果提示,花生多糖具有较强的抗氧化作用,拥有很好的开发前景。 相似文献
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《中国兽医杂志》2015,(12)
为了研究昆仑雪菊黄酮提取物(KFE)体外抗氧化活性,采用超声法提取昆仑雪菊中黄酮,乙醇浓度95%、温度40℃、时间15 min,提取3次。经过测定1 g昆仑雪菊粉末中含有0.125 g黄酮。分别用普鲁士蓝还原法、水杨酸法、邻苯三酚自氧化法、DPPH法以及硫代巴比妥酸法测定不同浓度下KFE的还原能力,对羟自由基(·OH)、超氧阴离子(O~(2-))、DPPH自由基的清除能力以及对脂质过氧化的抑制率。结果表明,KFE还原能力随浓度上升而增强,但弱于维生素C;对羟自由基清除能力在110 g/mL最强,清除率为18.72%,高于维生素C;清除超氧阴离子的能力弱;DPPH自由基清除能力在302.5 g/mL最强,清除率为94.47%;脂质体系抗氧化能力在605 g/mL最强,抑制率为54.22%。结果表明,KFE具有一定的抗氧化活性。 相似文献
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蚯蚓抗氧化提取液抗氧化作用研究 总被引：6，自引：0，他引：6
通过构建超氧阴离子自由基和羟基自由基体系以及脂蛋白多不饱和脂肪酸(PUFA)过氧化体系,测定蚯蚓抗氧化提取物在邻苯三酚自氧化体系中对超氧阴离子自由基、Fenton反应体系中对羟基自由基的清除作用及脂蛋白PUFA过氧化体系中对脂质体的抗氧化作用.通过对成年小鼠按时定量地灌喂蚯蚓抗氧化提取物,测定其血液和肝脏抗氧化酶活性及丙二醛(MDA)含量,检测蚯蚓抗氧化提取物在成年小鼠体内的抗氧化能力.结果显示,蚯蚓抗氧化提取物在体外自由基体系中具有较强的清除自由基的作用,且对脂质体氧化也有较强的抑制作用;在动物试验中,不同浓度的蚯蚓抗氧化提取物对成年小鼠血液及肝脏的SOD、CAT、GSH-PX活性的升高和MDA含量的减少均有不同程度的影响,并且以10倍稀释的蚯蚓抗氧化提取物影响最显著(P＜0.05),能有效降低小鼠体内的脂质过氧化水平并且防止体内抗氧化酶受自由基诱导的氧化损伤,提高抗氧化酶的活性. 相似文献
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【目的】探讨蜂胶清除自由基的能力与总黄酮和醇溶物含量的相关性。【方法】选取16个不同地区的蜂胶,用超声波辅助乙醇浸提法提取,Fenton反应和邻苯三酚自氧化反应测定醇提液对羟自由基(·OH-)和超氧阴离子自由基·(O2-)的清除率,分光光度法和重量法测定总黄酮和醇溶物的含量。【结果】蜂胶醇提液清除·OH-的能力与其总黄酮含量、醇溶物含量均存在极显著的正相关(r=0.751,P=0.0010.01)、(r=0.650,P=0.0060.01);清除·O2-的能力与其总黄酮含量、醇溶物含量均不存在明显的相关性(r=0.119,P=0.660.05)、(r=0.414,P=0.110.05)。【提示】蜂胶作为天然的自由基清除剂,其清除自由基的功效成分复杂,总黄酮和醇溶物含量的高低并不能完全代表蜂胶清除自由基能力的强弱。 相似文献
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本文概述了猪的毛色类型、猪的毛色遗传模式,着重综述了猪毛色基因分子基础的研究进展,指出存在问题并就未来发展方向做了思考。 相似文献
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以国际标准强毒Ｒ株人工感染非免疫产蛋鸡,定时扑杀,分别从鼻窦、眶下孔、气管、肺、气囊、卵巢和输卵管分离ＭＧ,并收集感染鸡所产蛋分离ＭＧ。结果表明,人工感染４８小时后上、下呼吸道及肺已被全面感染,９６小时气囊已被感染,１２０小时输卵管已能分离到ＭＧ,卵巢始终分离不到ＭＧ。人工感染鸡自１４４小时便能在其所产蛋中分离出ＭＧ。药物治疗能在７２小时内消除感染,油乳剂苗则需２４天后逐渐降低蛋内ＭＧ分离率,药物卵内注射、种蛋药浴、高温处理均能杀死卵内ＭＧ,但以研制的种蛋浸泡剂药浴效果为最好。 相似文献
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本试验旨在研究两种绿头鸭（白羽绿头鸭和绿头鸭）肌肉营养组成和价值,为绿头鸭肉产品的开发利用提供基础数据和理论依据。选择白羽绿头鸭和绿头鸭60只（每个品种各30只,公母各半）,依照国家标准测定胸肌粗蛋白质、粗脂肪、胆固醇含量及氨基酸、脂肪酸、微量元素和维生素的组成和含量,并对胸肌进行氨基酸评价及脂肪酸营养价值评价。结果显示,白羽绿头鸭肌肉粗蛋白质含量显著低于绿头鸭（P<0.05）;两种绿头鸭肌肉中均检测到17种含量大于0.01%的氨基酸,其中白羽绿头鸭肌肉苏氨酸、组氨酸、丝氨酸和脯氨酸含量显著高于绿头鸭（P<0.05）,赖氨酸、谷氨酸和精氨酸含量显著低于绿头鸭（P<0.05）;检测到13种含量均大于0.01%的脂肪酸,其中白羽绿头鸭硬脂酸和油酸含量显著低于绿头鸭（P<0.05）;检测到9种矿物质元素（钠、镁、钾、钙、锰、铁、铜、锌和硒）,两种绿头鸭差异不显著（P>0.05）;检测到8种维生素,白羽绿头鸭肌肉维生素B1含量显著高于绿头鸭（P<0.05）,维生素D和维生素E含量显著低于绿头鸭（P<0.05）。两种绿头鸭肌肉氨基酸比例接近世卫组织推荐的理想模式,富含人体所需的矿物质元素和维生素,具有广阔的开发利用前景。 相似文献
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魏静 《四川畜牧兽医学院学报》2009,(4):28-32
在现代法律秩序中,商会自治规范是制定法的基础和必要的补充,甚至在某些方面替代了制定法;商会自治规范主要包括商会组织规范、行为规范、惩罚规范以及争端解决规范等;其效力仅及于其内部成员;商会自治规范和制定法之间存在冲突,但也存在整合的基础。 相似文献
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Reasons for performing study: Clinical experiences indicate that centesis of the lateral compartment of the femorotibial joint is often unsuccessful. Objective: To determine the accuracy of 2 published and 2 unpublished techniques of centesis of the lateral compartment of the femorotibial joint. Hypothesis: It was hypothesised that a drug can be administered into the lateral compartment of the femorotibial joint via a diverticulum of this joint that surrounds the medial aspect of the long digital extensor tendon and that this technique is more accurate than described techniques of centesis of this compartment. Methods: Twenty‐four stifles of 12 horses were divided equally into 4 groups and a radiocontrast medium injected into the lateral compartment of the femorotibial joint of each group using a hypodermic needle inserted: 1) caudal to the lateral patellar ligament and proximal to the tibial plateau, 2) caudal to the long digital extensor tendon and proximal to the tibial plateau, 3) between the long digital extensor tendon and bone of the extensor groove of the tibia or 4) directly through the long digital extensor tendon until it contacted bone. Twelve veterinary students who had no experience using any of these techniques performed the injections. Accuracy of each technique was determined by examining radiographs obtained after injecting the contrast medium. Results: The most successful technique for arthrocentesis was by inserting a needle through the long digital extensor tendon. This approach was successful in all attempted cases, whilst other techniques had lower rates of success. Conclusions: The lateral compartment of the femorotibial joint can be accessed accurately by inserting a needle through the long digital extensor tendon as it lies within the extensor groove. Other techniques may not be as accurate for clinicians inexperienced in arthrocentesis of the lateral compartment of the femorotibial joint. 相似文献
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Marioni-Henry K Vite CH Newton AL Van Winkle TJ 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2004,18(6):851-858
A retrospective review of records of 205 cats with histologically confirmed disease of the spinal cord was performed to identify the prevalence of disease in this nonrandomly selected population of cats. Clinical records were reviewed, and age, duration of neurologic illness, and clinical and histopathologic findings in cats with spinal cord disease were abstracted. Disease processes were classified into 7 categories and 23 groups. The most common diseases affecting the spinal cord of cats were feline infectious peritonitis (FIP), lymphosarcoma (LSA), and neoplasia of the vertebral column secondarily affecting the spinal cord. Information on age, onset and duration of clinical signs, and lesion localization at the postmortem examination in cats belonging to the 7 categories of disease were analyzed to create a practical list of differential diagnoses. Cats were also subcategorized into 3 groups based on their age at death. FIP was the most common disease of cats younger than 2 years of age. LSA and vertebral column neoplasia were the most common diseases affecting cats between 2 and 8 years of age. Vertebral column neoplasia was the most common disease affecting cats older than 8 years of age. Results of this histopathologic study showed that FIP and LSA were the most common disease processes affecting the spinal cord of cats. However, at least 21 other groups of diseases and their relative prevalence were identified. 相似文献
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应用光镜和透射电镜技术，观察了3～6月龄比格犬甲状腺的显微和超微结构。结果表明，比格犬甲状腺实质由滤泡和滤泡旁细胞构成。滤泡呈圆形或椭圆形，直径20．22～220．00μm，平均90.80μm；由单层立方上皮细胞围成，细胞高度3．04～7.11μm，平均5.18μm，电镜下可见功能状态不同的两型滤泡上皮细胞；滤泡旁细胞很多，直径4．40～8．82μm，平均6．23μm，位于滤泡之间或镶嵌于滤泡上皮细胞之间，也可聚集在一起形成滤泡样结构，胞质内含有大量的分泌颗粒，电镜下也可见两种类型的滤泡旁细胞。 相似文献
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根据JJF1059-1999《测量不确定度评定与表示》建立了高效液相色谱法测定鸡肉中土霉素残留测量的不确定度评定方法,评定过程包括建立测量程序、分析不确定度来源、对不确定度分量进行量化。将不确定度归类为两大类。随机效应导致的不确定度可以通过一系列具有统计意义的重复观测值进行A类评定;系统效应导致的不确定度通过各测量器具、设备的说明书、校准证书提供的参数进行B类评定。本方法鸡肉中土霉素残留量的相对合成标准不确定度约为3.9%。 相似文献