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陶瓷膜超滤技术应用于桑椹汁的澄清与除菌加工 总被引：1，自引：0，他引：1
陶瓷膜超滤果汁具有澄清效果好、口感纯正的优点。将陶瓷膜超滤技术应用于桑椹汁的加工,对加工桑椹汁的澄清度、除菌效果以及主要理化指标进行测定,并作感官评价。在膜孔径0.5μm、操作压力0.15 MPa的条件下,桑椹汁的透光率可达68.2%,色泽与风味良好,细菌及芽孢的去除率分别达95.5%、98.7%,0～4℃下冷藏3个月仍清澈透明、无异味。结果表明采用陶瓷膜超滤技术加工的桑椹汁在澄清、除菌效果以及低温贮藏的稳定性方面与传统加工方法相似,但口感有明显改善,因此该技术可应用于桑椹汁的加工。 相似文献
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禽流感疫苗抗原浓缩工艺的研究 总被引：1，自引：0，他引：1
为了提升禽流感疫苗中的抗原效价,本研究采用密理博公司的切向流超滤系统,选用不同孔径的超滤膜和浓缩倍数对禽流感病毒(H9N2亚型,HP株)进行浓缩,观察HA和EID50的变化.结果显示:膜包孔径越大,病毒透过越多,但膜包孔径过小,浓缩时间长;随着浓缩倍数增加,HA和EID50均呈正相关增长,但高浓缩倍数耗时较长.说明禽流感疫苗生产中应根据抗原相对分子质量、HA、EID50和生产效率选择合适的超滤膜孔径和浓缩倍数. 相似文献
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《饲料工业》2016,(6)
试验旨在研究凝结芽孢杆菌的发酵条件、发酵液的浓缩方式、载体吸附等工艺,并评价其产品性能。采用10 L全自动发酵罐发酵凝结芽孢杆菌,采用有机膜和矿物质吸附剂对发酵液进行浓缩、吸附。采用体外消化试验、体外药敏试验、耐高温试验和产品储存试验评价产品性能。结果表明:1凝结芽孢杆菌制剂的最佳工艺参数为搅拌速度200 r/min,通气量350 L/h,浓缩设备为有机陶瓷膜过滤设备,矿物质吸附剂与发酵液比例为11。2产品在85℃处理10 min存活率为71%,经胃液消化后存活率为86.8%,过肠液后存活率为69%;产品在25℃和35℃储存30 d后仍保持50%作用的存活率,储存60 d后菌种数依旧可以到达108数量级。由此可见,此产品具有耐酸、耐胆盐、耐高温和易于储存等优良特性。 相似文献
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基于高效液相色谱-串联四级杆质谱(UPLC-MS/MS),建立了鸡肉中尼卡巴嗪残留标志物4,4'-二硝基均二脲(DNC)的检测方法。检测样本在乙腈水溶液提取下,经PRIME HLB固相萃取柱净化,氮吹浓缩后定容过膜上机检测。在2.0~500.0μg/L线性范围内,DNC标准曲线相关系数为r=0.999 26,检出限为0.11μg/kg。阳性添加回收试验中,DNC加标浓度分别为1.0、10.0、200.0μg/kg,回收率范围为91.4%~103.0%。本研究建立的方法简便、快捷、容易操作,液相色谱-串联质谱条件设置合理,灵敏度较高,相关参数优化较佳,可对样品进行准确定性和定量检测,适用于可食动物肌肉中尼卡巴嗪残留标志物DNC的检测。 相似文献
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巴氏奶的酸度值是产品的重要指标。本文比对了GB 5009.239-2016中两种方法检测结果的差异，跟踪检测了10批次浓缩巴氏奶生产过程中和样品在不同贮存条件下的酸度变化情况。结果表明，采用GB5009.239-2016中的第三法比第一法更适用于巴氏奶的酸度检测；原料奶贮存过程中的酸度增长与其本身的菌落总数和贮存时间显著相关；用RO膜浓缩的样品，其酸度浓缩比与蛋白质含量浓缩比相近；采用温度65～70℃、压力-0.7～-0.8bar的条件脱气可使牛奶酸度下降0.4±0.11 T；通过2～6℃冷藏配合冷热冲击条件，样品在14d内酸度增长0.26±0.05 T;10～14℃贮存时，样品在14d内酸度增长0.63±0.12 T。本研究结果显示，浓缩或脱气会显著影响样品的酸度值；贮存条件与贮存期内样品的酸度变化显著相关。本研究针对乳制品生产企业在浓缩巴氏奶生产管理的各主要环节提供了酸度控制的技术参考。 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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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 Objective: To determine the accuracy of 2 published and 2 unpublished techniques of centesis of the lateral compartment of the femorotibial joint.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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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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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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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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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
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以5个金柑属品种、枳壳、软枝酸橘及广西土柠檬实生苗为材料,进行复水成活率、旱害指数、叶片相对含水量、超氧化物歧化酶（SOD）、过氧化物酶（POD）、过氧化氢酶（CAT）、丙二醛（MDA）、脯氨酸等生理指标及隶属函数的综合分析,为柑橘抗性砧木品种选育提供参考。结果表明：胁迫20d复水后的成活率融安滑皮金柑和长寿金柑最高,为100%,软枝酸橘最低,为88.9%;随着干旱胁迫加剧,各品种的旱害指数呈上升趋势,长寿金柑的旱害指数最低,为0.25,软枝酸橘的旱害指数最高,为0.61;从叶片相对含水量的结果来看,长寿金柑的变化幅度最小,软枝酸橘的变化幅度最大,在第18d时分别为61.19%和37.85%;3种保护酶之间相互协同作用减轻植株受害程度,其活性变化幅度与丙二醛和脯氨酸的含量变化相似。利用隶属函数法综合分析,得出各品种的抗旱性强弱依次为长寿金柑>枳壳>融安滑皮金柑>融安金柑>山金柑>广西土柠檬>金枣>软枝酸橘。 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