共查询到20条相似文献,搜索用时 875 毫秒
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红花,又称草红花,双子叶植物,菊科,具有特殊香气,味微苦.红花花片长、色鲜红、质柔软者为上品[1].通过水溶醇沉法提取红花黄色素应用于小鼠,可清除羟自由基,抑制小鼠肝匀浆脂质过氧化,提高机体的抗氧化能力[2].而红花黄色素在畜牧生产中的应用研究较少.本试验研究红花黄色素对蛋鸡产蛋性能的影响,为红花黄色素应用于蛋鸡生产提供参考依据. 相似文献
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为了对新疆地锦草提取物的体外抗氧化及抑菌活性进行初步研究,通过测定醇提物还原力、清除羟基自由基和DPPH·自由基的能力来评价抗氧化能力;采用滤纸片法来测定醇、水两种提取物的抑菌活性,并确定最低抑菌浓度(MIC)。结果表明,新疆地锦草醇提取物具有较强的抗氧化能力;地锦草醇、水两种提取物对受试菌株均有明显的抑菌作用,其中醇、水两种提取物对金黄色葡萄球菌和大肠杆菌的最低抑菌浓度一致,MIC为1.56%。醇提物对枯草芽孢杆菌和变形杆菌的最低抑菌浓度一致,MIC为3.125%,而水提物对枯草芽孢杆菌最低抑菌浓度为12.5%,对变形杆菌最低抑菌浓度为25%。;地锦草两种提取物均有较强的热稳定性,但会受到p H值的影响;表明新疆地锦草提取物有较好的抗氧化和抑菌作用,具有较好的开发应用潜力。 相似文献
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蒲公英多糖对小鼠免疫机能的影响 总被引:2,自引:0,他引:2
蒲公英,别名黄花地丁,为菊科蒲公英属蒲公英(Taraxacum mongolicum Hand-Mazz.)带根全草,<中华人民共和国药典>(2005年)记载其具有清热解毒、消肿散结、利尿通淋等功效.现代药理研究显示,蒲公英具有广泛的药理活性,如抗病原微生物感染、提高机体免疫、保肝利胆、抗溃疡等,尤其是抗菌作用最为显著.将蒲公英提取物给小鼠口服,能提高小鼠的免疫功能[1]. 相似文献
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《中国兽医杂志》2020,(1)
蜂蛹具有抗氧化、降血糖、抗衰老、抗炎等多种功效,为研究蜂蛹提取物对顺铂(LDDP)诱导小鼠肾损伤的保护作用,本试验以云南胡蜂蜂蛹提取物为原料,测定了提取物中蛋白对超氧自由基及DPPH自由基的清除活性。通过构建顺铂诱导的小鼠肾损伤模型,测定血清及组织超氧化物歧化酶(SOD)、谷胱甘肽过氧化物酶(GSH-Px)、脂质过氧化物丙二醛(MDA)、肌酐(Cr)和尿素氮(BUN)的活性或含量,对小鼠肾脏进行组织切片染色分析。结果显示,当蜂蛹提取物浓度达到200 mg/mL时,其DPPH自由基清除率达到57%,最大氧自由基清除率接近97%,蜂蛹提取物具有良好的自由基清除活性,且自由基清除能力具有剂量依赖效应;与顺铂组相比,蜂蛹组中血清SOD和GSH-Px含量均升高约2倍,MDA、Cr、BUN含量均显著降低(P<0.05);结合肾脏组织切片H.E.染色分析,蜂蛹组小鼠肾脏组织的透明细胞和炎性细胞浸润现象有所改善,其损伤程度明显减轻。表明蜂蛹提取物可以减轻顺铂诱导的组织病理损伤,对小鼠肾损伤具有保护作用。 相似文献
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镉致鸡肾脏的氧化损伤及乙酰半胱氨酸的保护效应 总被引:1,自引:0,他引:1
镉是一种广泛存在于自然界中的慢性蓄积性毒物,主要通过职业性接触和环境污染对人类和动物健康造成威胁[1].家畜和家禽镉中毒是由于饲料中富含镉和工业镉污染及高镉的自然环境引起的,家禽镉中毒主要表现为:贫血、生长受阻、产蛋量下降、蛋壳品质降低、孵化率下降和死亡率增加等.国内外对镉所致哺乳动物肾毒性进行了广泛研究[2],而镉对禽类的肾脏毒性机制及中毒后的解毒机理研究不多.N-乙酰半胱氨酸(N-acetyl cysteine,NAC)为一富含巯基的抗氧化剂,可以螯合游离的镉离子.研究表明,NAC具有清除和干扰自由基生成、调节细胞的代谢活性、预防DNA损伤、调整基因表达和信号转导系统、抗细胞凋亡等作用[3].因此,本研究通过在饲料中添加NAC来研究其对镉所致鸡肾脏损伤的保护效应,为预防镉中毒提供理论依据. 相似文献
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绿原酸是杜仲、金银花等传统中药的清热解毒、抗菌消炎的主要药效成分.药理学研究证明,绿原酸具有抗菌、抗病毒、抗氧化、清除自由基、止血、降血压、降血脂及保肝利胆等作用[1-3].细胞色素P450酶(CYP450)主要存在于肝脏中.参与一系列药物的代谢,对维持机体内环境稳定有重要作用,是药理学、毒理学研究的热点.CYP3A约占CYP450总量的25%~28%,约有60%的药物经肝脏CYP3A代谢[4].在药物代谢中起着重要作用.CYP3A1是大鼠CYP3A家族最主要的亚型,它的活性高低直接影响许多药物的治疗效果和毒性反应.因此,研究药物对肝细胞CYP3A1的诱导作用对临床安全用药有重要意义. 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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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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REASONS FOR PERFORMING STUDY: Centesis of the bicipital bursa using an 8.9 cm long spinal needle has been reported but the alternative of employing a 3.8 cm long hypodermic needle requires validation. OBJECTIVE: To compare the efficacy of 2 different methods of centesis of the bicipital bursa and to evaluate the usefulness of ultrasonographic imaging to determine the location of solution administered when centesis of the bursa is attempted. METHODS: For Trial 1, 6 clinicians, who had no previous experience of centesis of the bicipital bursa, attempted to inject a solution composed of an aqueous radiopaque contrast medium and physiological saline solution (PSS) into the bicipital bursae of 2/12 horses using the previously described distal approach to inject one bursa and a proximal approach to inject the contralateral bursa. The bicipital tendon and bursa were examined ultrasonographically before and after injection; and both shoulders were examined radiographically to identify the location of the medium. In Trial 2, another 6 clinicians, also with no previous experience of centesis, repeated Trial 1, using 6 horses, but the radiopaque contrast medium was mixed with air instead of PSS. RESULTS: Accuracy of centesis using the proximal approach was 39% and that of the distal approach 28%. Ultrasonographic examination of the shoulder allowed the location of solution and air to be accurately predicted in all 12 shoulders examined. CONCLUSIONS: Clinicians who have had no previous experience performing centesis of the bicipital bursa are unlikely to be successful in centesis using either approach. Radiographic examination after injecting a radiopaque contrast medium may be necessary to assess the success of centesis especially if bursal fluid is not obtained during centesis. Injecting air along with the radiopaque contrast medium provides more accurate ultrasonographic confirmation of centesis and better radiographic definition than does injection without air. 相似文献
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Effects of size of ingestively masticated fragments of plant tissues on kinetics of digestion of NDF
Ingestively masticated fragments were collected and sized via sieving. Different sizes of esophageal masticate and ruminal digesta fragments, and ground fragments of larger masticated pieces were incubated in vitro, and undigested NDF remaining at intervals of up to 168 h of incubation was determined. The ruminal age-dependent time delay (tau) for onset of digestion of NDF was positively correlated (P < 0.004) with the mean sieve aperture estimated to retain 50% of the fragments between successive sieve apertures (MRA). Degradation rate of potentially degradable NDF (PDF) and level of indigestible NDF were not related (P > 0.10) to MRA of masticated and ground fragments. Estimates of tau were positively related to MRA, with slopes of bermudagrass < corn silage < ruminal fragments of corn silage. It was concluded that fragment size-, and consequently, ruminal age-dependent onset of PDF degradation of a mixture of different fragment sizes results in an age-dependent rate of degradation of the more rapidly degrading of two subentities of PDF. Models are proposed that assume a tau before onset of simultaneous degradation of PDF from two pools characterized as having gamma-modeled age-dependency and age-constant rates. The ruminal age-dependent pool seems to be associated with the faster-degrading pool, and its rate parameter increases with range in MRA in the population of fragments. Conceptually, the ruminal age-dependent rate parameter for PDF degradation seems to represent a composite of several effects: 1) effects of the size-dependent tau; 2) range in MRA of the population of ingestively masticated fragments; and 3) subentities of PDF that degrade via more rapid age-dependent rates compared with subentities of PDF that degrade via age-constant rates. The estimated fractional rates of ruminative comminution of ingestively masticated fragments (0.060 to 0.075/h) were of a magnitude similar to the mean fractional rates of PDF digestion (0.030 to 0.085/h), which implies that ruminative comminution may be first-limiting to fractional rate of PDF digestion. The in vivo roles of ingestive and ruminative mastication of fragments on PDF degradation must be considered in any kinetic system for estimating PDF digestion in the rumen. These results and others in the literature suggest that the rate of surface area exposure rather than intrinsic chemical attributes of PDF may be first-limiting to degradation rate of PDF in vivo. 相似文献