依兰香花挥发油成分的气相色谱-质谱分析     

郭玉华  赵俊凌  元超 《热带农业科技》2014,(4):17-19

试验分别采用超临界CO2流体萃取和水蒸汽蒸馏技术提取依兰香花挥发油,超临界CO2流体萃取技术挥发油提取率为3.9%,明显高于水蒸汽蒸馏技术挥发油得率3.0%。采用GC-MS方法对挥发油成分进行分析,两种提取技术所得挥发油组成成分基本一致,确定出依兰香花挥发油成分有β-石竹烯、Germacrene D、苯甲酸苄酯、1,4,7,-Cycloundecatriene,1,5,9,9-tetramethyl-,Z,Z,Z-、以及乙酸薰衣草酯等近20种。试验表明,超临界CO2流体萃取更适用于依兰香花挥发油的提取,并且β-石竹烯可以作为衡量依兰香花挥发油品质的重要参考。  相似文献   

Research on the Application of Moving Mesh Technology in Computational Fluid Dynamics Simulation          下载免费PDF全文

CHENG Zhiyuan  LI Li  LONG Xiaohong  Wang Tengfei 《保鲜与加工》2013,(2):96-101

This paper applies moving mesh technology to the numerical simulation analysis of computational fluid dynamics（CFD） based on harmonic mapping theory.It deduces renewal process of the solving domain when moving mesh technolog deals with problems of large deformation,and the corresponding program flow diagram is given.It solves the problems of grid large deformation which the traditional fixed grid is unable to simulate.It uses the multi-physical coupling analysis software COMSOL Multiphysics 4.0a to couple the moving mesh equation with controlling differential equation,and simulates the movement of the oil inside the swaying tank. The numerical simulation show that moving mesh technology can simulate the situation of solving domain’s large deformation truly.In the process of simulation,the number of the nodes and grids in the fluid domain do not increase,it just changes the shape of the grids,so that,the moving mesh method dose not increase the spending of computer resources extra.  相似文献   

Equine myeloperoxidase: A novel biomarker in synovial fluid for the diagnosis of infection     

J. Wauters  F. Pille  A. Martens  T. Franck  D. Serteyn  F. Gasthuys  E. Meyer 《Equine veterinary journal》2013,45(3):278-283

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Accurate Antemortem Diagnosis of Equine Protozoal Myeloencephalitis (EPM) Based on Detecting Intrathecal Antibodies against Sarcocystis neurona Using the SnSAG2 and SnSAG4/3 ELISAs     

S.M. Reed  D.K. Howe  J.K. Morrow  A. Graves  M.R. Yeargan  A.L. Johnson  R.J. MacKay  M. Furr  W.J.A. Saville  N.M. Williams 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2013,27(5):1193-1200

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Indirect Fluorescent Antibody Test and Surface Antigen ELISAs for Antemortem Diagnosis of Equine Protozoal Myeloencephalitis     

A.L. Johnson  J.K. Morrow  R.W. Sweeney 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2013,27(3):596-599

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不同来源木聚糖酶在模拟胃液和肠液中的稳定性评价     

姚丹丹  钱宇英  石学刚 《饲料工业》2013,(14)

试验研究了市售8种不同来源木聚糖酶在模拟胃、肠液中的稳定性。分别将不同来源木聚糖酶产品在模拟胃、肠液中培养0、1、2和3h后测定其酶活存留率,用以评估不同来源木聚糖酶在模拟胃、肠液中的稳定性。结果表明：8种木聚糖酶在模拟胃、肠液中的稳定性差异较大,在模拟胃液中,耐受性最好的是酶Ⅳ、酶Ⅶ和酶Ⅷ,3 h后存留率分别为：105%、98%和106%;耐受性最差的为酶Ⅰ,3 h后存留率仅为4%;在模拟肠液中,耐受性最好的是酶Ⅰ,3 h后存留率为99%;耐受性最差的为酶Ⅳ,3 h后存留率为44%。  相似文献   

Essential Oil from Inula britannica Extraction with SF-CO2 and Its Antifungal Activity     

ZHAO Te  GAO Fei  ZHOU Lin  SONG Tian-you 《中国农业科学(英文版)》2013,(10):1791-1798

The aim of this study was to determine the extraction technique of supercritical fluid carbon dioxide(SF-CO 2) for the essential oil from Inula britannica flowers and its antifungal activities against plant pathogenic fungi for its potential application as botanical fungicide.The effects of factors,including extraction temperature,extraction pressure,SF-CO 2 flow rate,flower powder size,and time on the essential oil yield were studied using the single factor experiment.An orthogonal experiment was conducted to determine the best operating conditions for the maximum extraction oil yield.Adopting the optimum conditions,the maximum yield reached 10.01% at 40°C temperature,30 MPa pressure,60 mesh flower powder size,20 L h-1SF-CO 2 flow rate,and 90 min extraction time.The antifungal activities of I.britannica essential oil using the SF-CO 2 against the most important plant pathogenic fungi were also examined through in vitro and in vivo tests.Sixteen plant pathogenic fungi were inhibited to varying degrees at 1 mg mL-1concentration of the essential oil.The mycelial growth of Gaeumannomyces graminis var.tritici was completely inhibited.The radial growths of Phytophthora capsici and Fusarium monilifome were also inhibited by 83.76 and 64.69%,respectively.In addition,the essential oil can inhibit the spore germination of Fusarium oxysporum f.sp.vasinfectum,Phytophthora capsici,Colletotrichum orbiculare,and Pyricularia grisea,and the corresponding inhibition rates were 98.26,96.54,87.89,and 87.35% respectively.The present study has demonstrated that the essential oil of I.britannica flowers extracted through the SF-CO 2 technique is one potential and promising antifungal agent that can be used as botanical fungicide to protect crops.  相似文献   

CO2超临界萃取法提取苦瓜籽油及其GC-MS分析     

郭宁平 《广东农业科学》2013,40(11):77-79

一种野生品种苦瓜的籽用索氏提取法提取苦瓜油,测得含油率为38.0％;苦瓜籽仁粉末在CO2超临界状态下,通过正交试验法对萃取压力、温度、时间和CO2流量等因素进行筛选,确定苦瓜籽油萃取工艺参数为萃取压力37 MPa、萃取温度40℃、CO2流量40 L/h、萃取时间为2h时苦瓜籽油得率为97.2％;超临界状态下萃取的苦瓜籽油经GC-MS分析结果表明,苦瓜籽油多种不饱和脂肪酸含量达79.60％,高含量多不饱和脂肪酸的存在使其具有生物活性产品的开发价值.  相似文献   

Apheresis in three dogs weighing <14 kg     

Lysa P Posner  Jennifer L Willcox  Steven E Suter 《Veterinary anaesthesia and analgesia》2013,40(4):403-409

HistoryCaridianBCT apheresis machines require a ~285 mL priming volume (extracorporeal blood) that is withdrawn from the patient in ~10 minutes. Therefore, apheresis in dogs has generally been limited to dogs > ~20 kg to assure <20% of the blood volume is removed in the priming phase.Animals/physical examinationThree dogs weighing <14 kg (13.6, 10.5, and 9.9 kg) with lymphoma that underwent apheresis.ManagementThe dogs were premedicated for placement of apheresis catheters with hydromorphone (0.1 mg kg^?1) IM. Anesthesia was induced with propofol, to effect, intravenously and general anesthesia was maintained with isoflurane in oxygen. Following catheter placement, dogs were allowed to recover from isoflurane but were kept sedated with either a dexmedetomidine constant rate infusion (CRI) or a propofol CRI. Real time autologous blood priming was not performed in any of the dogs. Instead, priming solutions were composed of a combination of hetastarch, lactated Ringer's solution, and/or autologous blood that was harvested 4 days before the procedure. During apheresis, dogs received anticoagulant citrate‐dextrose, solution‐A (ACD‐A) to prevent clotting and 10% calcium gluconate as needed to maintain normal ionized calcium concentrations. Dogs were monitored for cardiovascular and cardiopulmonary stability, anemia and lactic acidosis.Follow‐upAll of the dogs had cardiovascular and cardiopulmonary values within clinically acceptable ranges. Immediately following apheresis all of the dogs were mildly to moderately anemic (PCV; 17–35%) although none of the dogs required a transfusion or had an increased lactate concentration.ConclusionsDogs as small as 9.9 kg can successfully undergo apheresis with a variety of priming solutions. Dexmedetomidine or propofol given as a CRI provides sufficient sedation for this procedure.  相似文献   

An In vitro Evaluation of Some Unconventional Ruminant Feeds in Terms of the Organic Matter Digestibility,Energy and Microbial Biomass     

Al-Masri MR 《Tropical animal health and production》2003,35(2):155-167

In vitro organic matter apparent digestibility (IVOMAD), true digestibility (IVOMTD), metabolizable energy (ME), net energy lactation (NEL), microbial nitrogen (MN) and synthesis of microbial biomass (MBM) were estimated to predict the nutritive values of some agricultural by-products, drought-tolerant range plants and browses. The relationships between in vitro gas production (GP), and true or apparent digestibility, MN and MBM were studied utilizing an in vitro incubation technique. The values of IVOMAD, IVOMTD, ME, NEL, GP, MBM and MN varied with the studied experimental materials. The true fermentation of the outside part of Atriplex leucoclada produced a higher volume of gas than the middle or the inside parts, and this was associated with an increase in the values of IVOMAD, IVOMTD, ME and NEL. However, screening off the wood from olive cake to obtain olive cake pulp increased the IVOMAD, IVOMTD, ME, NEL and the volume of gas production from the true fermented material. One ml of gas was generated from the true degradation of 5 mg of wheat straw, Moringa oleifera, Alhagi camelorum, Eucaliptus camaldulensis and A. leucoclada, from 11 mg of Prosopsis stephaniana and olive cake pulp, and from 20 mg of olive cake or olive cake wood. The amount of MN or MBM produced from 100 mg of truly fermented organic matter depended on the kind of the fermented material and amounted to 0.7–2.9 mg or 8–34 mg, respectively. Crude fibre was negatively correlated to IVOMAD, IVOMTD, ME and NEL. Gas production was positively correlated to IVOMAD and IVOMTD but negatively correlated to MBM and MN.  相似文献