铁观音茶叶中茶多酚提取工艺条件的优化

为了探究提取铁观音茶叶中茶多酚的最佳工艺条件,选取了液固比、浸提温度和浸提时间3个指标为因素,采用L9(33)正交试验设计对提取工艺进行了优化。结果表明,各因素对铁观音茶多酚提取的贡献由大到小排列依次为A(液固比)C(浸提时间)B(浸提温度),但这3个因素对茶多酚含量影响的差异不显著;最佳提取工艺条件为:液固比120︰1、浸提温度100℃、浸提时间30 min,在该条件下茶多酚的含量最高,达15.5%。     

添加配重的五杆式丹参移栽机构动力学优化设计与试验

配重法能降低五杆式丹参移栽机构的振动,改善其动力学性能.为获取所添加配重的最优参数,建立五杆式丹参移栽机构的动力学模型,在动力学模型的基础上建立移栽机构的动力学优化模型,运用多目标函数获取机构不同转速下所添加配重的优化参数,通过动力学分析,确定曲柄转速为60 r/min时所对应的配重参数为最优参数组合:曲柄AB添加配重...     

复方解热灵对发热猪的疗效试验

复方解热灵,常规解热药给药于发热动物,均能起到解热的效果。通过不同剂量的复方解热灵和常规解热药,对人工复制病例兔与自然病例猪(非传染性发热)分别进行治疗。比较给药前后的体温变化,表明两种药物作用于动物后体温均呈下降趋势,但复方解热灵的疗效更显著,体温变化明显,p<0.01,差异显著。     

The fate of chlortetracycline residues in a simulated chicken–fish integrated farming systems

Two experiments were conducted at the Asian Institute of Technology, Pathumthani, Thailand to investigate the fate of chlortetracycline (CTC) residue in chicken manure and its effect on integrated chicken–fish farming system. During the first experiment, broiler chickens were raised and CTC residues in their manure were analysed. Chicken fed diets containing 0, 50, 200 and 800 CTC mg kg^?1 had CTC residue levels of 0, 0.9, 3.8 and 6.5 CTC ng g^?1. Once the diet containing CTC was withdrawn, CTC in the manure dropped to negligible amounts (0, 0, 0.2 and 0.5 CTC ng g^?1) within 1 day. Integrated chicken–fish farming systems were simulated during the second experiment to determine the fate of antibiotic residues in chicken manure in aquaculture environment. Chickens were fed a CTC‐free diet and a feed containing CTC at 200 mg kg^?1. Ten 4 m³ square concrete tanks (2 × 2 × 1 m) were used for the experiment. Five tanks were fertilized with CTC‐contaminated manure and the remaining five tanks were fertilized with CTC‐free manure at a rate of 100 kg dry matter ha^?1 day^?1. Sex‐reversed Nile tilapia (Oreochromis niloticus) was stocked at 12 fish tank^?1 on the 14th day after chicken manure application. The immuno‐radio microbial receptor assay (Charm II test) revealed that edible fish muscle, fish intestinal tract and sediment were contaminated by CTC at rates of 7.21, 22.104 and 1.788 ng g^?1, respectively, after 45 days. Chlortetracycline was detected on day 20 in the water column and gradually increased from 0.26 to 12.13 ng g^?1. Chlortetracycline residues were not detected in fish or the aquatic environment of the CTC‐free treatment. The results demonstrate the potential for antibiotic residue accumulation in fish and aquatic environment when CTC‐contaminated chicken manure is used for pond fertilization.     

The effectiveness of a new physical property evaluation method of kamaboko which applied the principal component analysis to the puncture and stress relaxation tests

ABSTRACT:   The physical properties of 49 commercial kamabokos were measured by the puncture and stress relaxation tests. The principal component analysis was applied to the physical parameters of both tests, and their cumulative contribution ratios were over 90% with the first and second principal components, respectively. The comparison among the kamabokos was carried out using the synthetic physical parameters. The kamabokos produced in same area showed the peculiar distribution. The relative positional relation of kamabokos measured by the stress relaxation test was different from that by the puncture test for many of the kamabokos. Physical property evaluation using a principal component analysis is very effective for intensiveness of many measurement parameters. If much more kamabokos were measured by this method, regional characteristics of kamabokos would be clarified.     

苏格兰折耳猫骨软骨发育不良的诊疗体会

苏格兰折耳猫骨软骨发育不良也称为苏格兰折耳猫骨营养不良,是影响骨骼生长和关节软骨形成、导致四肢远端和尾部畸形的一种遗传性疾病。一例疑似病例中患畜主要表现为双侧后肢跗关节处肿胀,有疼痛感,爪部、尾部变短、厚,弯曲不灵活。经血常规和影像学检查确诊为苏格兰折耳猫骨软骨发育不良。通过一段时间药物治疗,病情好转,后肢可以着地走路。     

兔支气管败血波氏杆菌的分离鉴定及药敏试验

山东枣庄某大型兔场送检死亡幼兔病例,经过病原菌的分离鉴定、PCR 检测、药物敏感性试验、敏感动物致病性分析及临床综合治疗等,成功分离到一株对小鼠有一定的致病性的兔败血性波氏杆菌,该菌株对氟苯尼考、多西环素、红霉素等高敏,临床上采取疫苗紧急防疫结合药物治疗的综合防治措施顺利控制了该病的发生。     

运输应激对比格犬血常规及生化指标的影响

为了研究运输应激伴随的冷应激、驱赶、捕捉及饲料改变等多重应激对比格犬血常规和血液临床生化指标造成的影响,并且评估1周适应性饲养时间的合理性。以30只比格犬作为试验对象,对其适应性饲养前后的血常规和血液临床生化指标进行检查,并对数据进行分析发现,适应性饲养前犬的血常规和生化指标都有显著变化,1周的常规适应性饲养后,犬应激症状消失,血常规和生化检查指标均回复正常;这说明应激对比格犬造成了显著的影响,1周的适应性饲养是合理且必须的。     

2019-2023年度陕西省科企联合体小麦区试品种抗病性鉴定与评价

为掌握陕西省科企联合体小麦区试品种抗病性水平,对2019—2023年度连续5年参加联合体区试的114份品种,采用大田人工接种的方法进行小麦条锈病、白粉病、赤霉病、叶锈病和纹枯病等5种病害的抗性鉴定与评价。结果表明,供试的114份品种对鉴定的5种病害抗性程度差异较大,表现为对条锈病抗性水平较高,对白粉病和赤霉病抗性水平最差。供试品种中,对条锈病表现免疫-中抗的品种61份,占供试品种的53.51%;对白粉病表现免疫-中抗的品种27份,占供试品种的23.68%;对赤霉病表现抗-中抗的品种21份,占供试品种的18.42%;同时鉴定出2份对5种病害均表现抗病的品种,分别为西农968和金麦207。对21份高感条锈病的品种均按陕西省区试品种试验要求终止了试验。     

早春保护地鲜食番茄引种试验

采用田间试验法对朝研219、欧盾、佳盈、金粉钻、金棚1号5个番茄品种进行引种观察。试验结果表明,朝研219,大果品种,平均单果质量238 g,前期产量较对照金棚1号增产4.7%,表现为中熟;总产量较对照增产32.5%,达到丰产水平。欧盾,无畸裂果,平均单果质量138 g,前期产量较对照增产16.5%,表现为早熟;总产量较对照增产27.5%。金粉钻,大果品种,平均单果质量211 g,前期产量较对照减产15.7%,总产量较对照增产15%,可作为晚熟品种推广。佳盈,大果品种,平均单果质量191 g,前期产量较对照增产9.57%,表现为早熟;总产量较对照增产12.5%。4个品种综合表现都优于对照品种金棚1号,适合河南地区推广,前期注意防治病毒病。