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乳制品中具有降胆固醇功能乳酸菌的体外筛选   总被引:7,自引:0,他引:7  
用改良的o-phthalaldehyde法对pH3.0和0.3%牛胆酸钠有一定耐受性的10株乳酸菌的体外降胆固醇活性进行了测定。这些菌在含0.3%胆盐的培养基中,37℃厌氧培养24h后,均表现出较强的降胆固醇活性。胆固醇脱除率从30.4%~43.6%不等。其中鸟肠球菌WZ38—2对胆固醇的脱除率最高;其次为植物乳杆菌WHl3—1和WH23—1。  相似文献   

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The experiment was aimed to establish a drug metabolic model of the blood cells in chicken. The effects of three kinds of culture medium (L-15,M199 and RPMI1640) and different concentrations of fetal bovine serum (FBS) were compared to optimize the culture condition of blood cells,and the proper time of medication was determined after the cell vitality was measured by MTT assay. The content of ribavirin and its metabolites (TCONH2 and RTCOOH) were detected after the ribavirin was dosed. The results showed that the cell viability was highest when the blood cells cultured in L-15 medium,the state of blood cells was better when 10% FBS was added to the medium. The best time for medication was when blood cells were cultured for 3 h. The content of ribavirin was decreased with the time of administration,the metabolites of ribavirin were increased quickly after half an hour, it changed slowly after 3 h. In conclusion,the metabolic model of blood cells in chicken was successfully established,and the blood cells cultured in vitro were better using L-15 medium supplemented with 10% FBS. The metabolic transformation function of blood cells in chicken was indicated by the medication test of ribavirin and it could be used to study the drug metabolism in vitro.  相似文献   

4.
试验旨在建立鸡血细胞药物代谢模型,并用利巴韦林进行验证。本试验比较了3种不同培养基(L-15、M199和RPMI1640培养基)及添加不同浓度胎牛血清的细胞培养效果,采用MTT法测细胞活力,确定最佳给药时间,之后用利巴韦林进行给药,检测培养液中利巴韦林及其代谢物(TCONH2和RTCOOH)含量。结果发现,3种培养基中用L-15培养基培养时细胞存活率最高,胎牛血清添加浓度为10%时血细胞状态较好;血细胞活力检测表明其最佳给药时间为培养3 h;利巴韦林给药后,其含量随着时间的延长而降低,TCONH2和RTCOOH在给药0.5 h时迅速产生,给药3 h后其浓度变化趋于平缓。综上所述,本试验建立的鸡血细胞代谢模型操作简便,用添加10%胎牛血清的L-15培养基培养效果较好,利巴韦林给药试验表明,鸡血细胞存在一定的代谢转化功能,该鸡血细胞代谢模型可用于某些药物的体外代谢研究。  相似文献   

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The pig is considered to be a suitable source of cells and organs for xenotransplants, as well as a transgenic animal to produce specific proteins, given the biological similarities it shares with human beings. However, the in vitro embryo production system in pigs is inefficient compared with those in other mammals, such as cattle or mice. Although numerous modifications have been applied to improve the efficiency of in vitro embryo production systems in pigs, not much progress has been made to overcome the problem of polyspermy, and low developmental ability due to insufficient cytoplasmic abilities of in vitro matured oocytes and improper culture conditions for the in vitro produced embryos. Recent achievements, such as the establishment of chemically defined medium and utilization of ‘zona hardening’ technique, have gained some success. However, further research for the reduction of polyspermy and detrimental effects of the culture systems in pigs is still needed.  相似文献   

6.
山羊体外受精技术的研究进展   总被引:2,自引:0,他引:2  
本文主要阐述了山羊体外受精技术,特别是山羊卵母细胞的采集和体外成熟,体外受精以及胚胎培养过程中的一些研究进展,及其山羊体外受精技术的非常广阔的前景。  相似文献   

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In this in vitro study, the modified Hohenheim gas test (HGT) was applied to determine fermentation activity and bacterial composition of pig's faecal microbial inoculum using different concentrations of cellobiose. Incubation procedures included normal buffered and osmotic stress conditions (elevated medium salinity). After 24 hr of fermentation, production of gas, ammonia and short‐chain fatty acid (SCFA) was measured, and the gene copy numbers of total bacteria, Lactobacillus spp., Bifidobacterium spp., Roseburia spp., Clostridium Cluster IV spp. and Enterobacteriaceae were analysed using real‐time polymerase chain reaction. There was a significant reduction in gas production after 24 hr when comparing osmotic stress conditions with normal buffered conditions. Under osmotic stress, increasing cellobiose concentrations linearly increased gas production (< .001), while ammonia, acetic acid and isobutyric acid concentrations decreased (< .001, = .012, = .035 respectively). Under normal buffered conditions, Roseburia spp. gene copies linearly increased with increasing cellobiose concentrations (= .048). Lactobacillus spp. and Bifidobacterium spp. numbers were higher under osmotic stress (< .001) compared to normal conditions. Results might point towards a positive impact of cellobiose supplementation on gut health especially under osmotic stress conditions.  相似文献   

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本文阐述了体外受精技术在牛胚胎工程和育种研究中的意义,介绍了牛体外受精技术的研究历史和目前的研究进展,对牛IVF技术的技术指标现状及经济效益进行了评估,并就牛的体外受精技术当前研究存在的问题作了评述,对其前景做了展望。  相似文献   

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鹿类体外受精技术研究现状   总被引:1,自引:0,他引:1  
鹿类体外受精技术研究方面已有新西兰和法国的技术体系,但培养系统尚未建立,还处在起始阶段。作者阐述了鹿卵巢的采集、运输和卵母细胞的采集;卵母细胞的体外成熟培养;精子的体外获能和体外受精及受精卵的体外培养等方面研究报道的一些试验技术和方法。  相似文献   

10.
文章从卵母细胞的来源、精子体外获能、卵母细胞体外成熟、体外受精和体外受精早期胚胎培养五个方面综述了牛卵母细胞体外受精和体外成熟技术的研究进展.同时指出了影响精子体外获能的因素、影响卵母细胞成熟培养的因素、体外受精存在的问题及解决办法等.并且对影响该技术的主要因素进行了系统分析.  相似文献   

11.
研究了不同激素配比、性周期阶段对白牦牛卵母细胞体外成熟的影响,同时研究了不同培养基对早期胚胎体外发育的影响。结果表明:M199+0.2mmol/L丙酮酸钠+10%NBs+5.0mg/L LH+0.5mg/LFSH+1>g/ml 17β-E2是白牦牛卵母细胞体外成熟较为理想的培养系统(成熟率79.4%、卵裂率42.5%)。采集白牦牛卵母细胞时卵巢所处性周期阶段(卵泡期、黄体期)影响卵母细胞的体外成熟(成熟率分别为77.6%、69.5%,卵裂率分别为45.7%、35.6%)。输卵管上皮细胞和颗粒细胞是理想的共培养细胞,能有效克服白牦牛早期胚胎发育阻滞(桑囊胚发育率分别为10.6%、7.7%)。  相似文献   

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Mother liquor (ML) is monosodium glutamate by‐product and contains much crude protein (CP). The objective of this study was to investigate the effect of supplementation of two types of MLs having different chemical compositions on in vitro ruminal fermentation characteristics. ML1 had 74% organic matter (OM) and 70% CP and ML2 had 85% OM and 83% CP on a dry matter (DM) basis. The experiments were conducted using 0.5 gDM rolled barley or ryegrass straw as substrates. Urea and freeze‐dried MLs were added at three levels of nitrogen to be isonitrogenous. The ML1 treatment increased gas production compared with the ML2 treatment in barley substrate condition (< 0.05). The supplementary ML2 increased gas production compared with the supplementary urea, and the digestibilities of DM and neutral detergent fiber expressed exclusive of residual ash (NDFom) were higher for the supplementary ML2 than for the supplementary ML1 in straw substrate condition (< 0.05). In both the conditions, ammonia nitrogen concentrations of the ML1 and ML2 treatments were lower than that of the urea treatment (< 0.05). The results indicated that the supplementary ML1 and ML2 activated in vitro ruminal fermentation particularly in concentrate and roughage substrate conditions respectively.  相似文献   

13.
牛卵泡卵母细胞体外受精和发育的研究   总被引:1,自引:0,他引:1  
利用屠宰黄牛卵巢作为供试材料 ,对卵巢表面 2~8mm卵泡卵母细胞体外受精(IVF) -受精卵的体外发育 (IVD)进行了系列研究 ,采用上游法、Percoll法和本实验室沿用的直接洗涤法处理牛冻精 ,观察 3种精子处理方法处理牛冷冻精子对卵母细胞体外受精胚胎发育的影响。实验结果 ,就卵裂率指标 ,采用Percoll法处理的精子进行卵母细胞体外受精 ,和上游法及洗涤法分别比较 ,差异均不显著 (P >0 .0 5 ) ;桑囊率指标 ,只有上游法比洗涤法高 ,差异显著 (P <0 .0 5 ) ,其余差异均不显著。以FERT -TALP液作为受精液采用常规培养方法 ,精卵作用 18~ 2 0h后分开 ,与精卵作用 6~ 8h后分开卵母细胞受精后的 8-细胞发育率及桑囊率变化不大 (P >0 .0 5 ) ;卵裂率指标 ,18~ 2 0h处理组高于 6~ 8h处理组 ,但两组之间差异也不显著。表明 ,在生产中采用FERT -TALP液做为受精液 ,应用上游法处理精子 ,不需要另购试剂 ,精卵孵育时间由 18~ 2 4h缩短至 6~ 8h是可行的 ,其现实意义是可以简化胚胎体外生产的程序 ,节省人力 ,降低成本  相似文献   

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牛的体外受精技术研究进展   总被引:2,自引:0,他引:2  
本文阐述了体外受精技术在牛胚胎工程和育种研究中的意义,介绍了牛体外受精技术的研究历史和目前的研究进展,对牛体外受精技术的技术指标现状及经济效益进行了评估,并就牛的体外受精技术当前研究存在的问题作了评述,对其前景做了展望。  相似文献   

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牛体外胚胎生产程序包括卵母细胞体外成熟(in vitro maturation,IVM)、精子获能(sperm capacitation)、体外受精(in vitro fertilization,IVF)和体外培养(in vitro culture,IVC)。体外成熟卵母细胞的发育能力低于体内成熟卵母细胞,是目前体外胚胎生产面临的难题之一。虽然体外成熟期似乎很难影响卵母细胞的质量,但基本成熟条件的改变会显著影响卵母细胞的发育能力,故卵母细胞体外成熟是体外胚胎生产的关键环节。目前大部分改善卵母细胞体外成熟的研究都是在培养液中添加激素、血清、牛卵泡液、生长因子或抗氧化剂等物质,以此促进卵母细胞的成熟度,使其更好地与精子结合,故文章就不同体外成熟条件对卵母细胞体外成熟后最终囊胚产量的影响研究进行了综述。  相似文献   

16.
本文针对牛胚胎体外生产的关键技术环节体外受精,从温度、卵母细胞、公牛个体、培养液组成、渗透压及pH值等方面阐述了影响牛精子体外获能的因素。  相似文献   

17.
试验对牛胚胎体外生产技术中的体外受精液、精卵共育时间、血清和培乔液等影响早期胚胎体外发育的因素进行了研究。以BO(Brackett & Oliphant)和BM(BO:成熟培养液=3:2)作为受精液,受精卵的囊胚发育率分别为26.0%和15.0%;精卵共育时间以9-12h为宜;受精卵在含血清FBS或OCS培养液中的专胚发育率分别为26.4%或29.9%,明显高于在无血清培养基中的囊胚发育率(10.3%);TCMl99、mBECMaa、mSOFaa3种胚胎培养液均能支持受精卵的体外发育,在其中培养受精卵囊胚发育率分别为18.O%、30.7%和29.2%。试验结果表明:精卵于BM受精液中共育9~12h后,将假定受精卵置于添加5%OCS的mBECMaa或mSOFaa培养液中培养,能显著提高体外生产胚胎的囊胚发育率。  相似文献   

18.
马红  王文涛  付博  仁亮  刘娣 《兽医大学学报》2013,(9):1451-1453,1457
通过比较参与受精的卵母细胞颗粒细胞存在与否、精子上浮时间、精卵共孵育时间、不同受精液等4个方面的因素,研究这些因素对猪卵母细胞体外受精后胚胎发育能力的影响,以求找到最佳的猪卵母细胞体外受精体系。将选择带有不同颗粒细胞的卵丘卵母细胞复合体分为3组:含全部颗粒细胞、2~3层颗粒细胞和裸卵;调整精子在受精液里的上浮时间为0、30、60、120min研究其受精能力;比较3、6、20h精卵共孵育时间对体外受精的影响;结果表明:在本试验体系下,在mTBM受精液中,将精子上浮处理60min,与含2~3层颗粒细胞的卵丘-卵母细胞复合体共孵育6h的IVF体系最为有效,其卵裂率为(77.6±2.3)%,囊胚率为(25.7±2.6)%。  相似文献   

19.
牛早期胚胎体外发育条件的研究   总被引:5,自引:0,他引:5  
本试验研究了精卵共育时间和培养液等因素对牛早期胚胎体外发育的影响。精卵共育6~12h能显著提高受精卵的囊胚发育率,受精卵的囊胚发育率为23.2%~25.3%,共育时间为24h时,囊胚发育率降低,但精卵共育6h时卵裂率较低;TCM199、mBECMaa、mSOFaa均能支持体外受精卵的发育,其囊胚发育率分别为18%、30.7%和29.2%。试验结果表明:精卵于BM受精液中共育9h后,将其置于添加5%OCS的mBECMaa或mSOFaa中培养,能得到较高的体外生产胚胎的囊胚发育率。  相似文献   

20.
卵母细胞体外成熟培养技术是现代生物技术中的重要内容之一。作者就卵母细胞体外成熟的调节机制、成熟过程中的形态学变化、影响成熟的主要因素以及存在的问题等作一综述。  相似文献   

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