结晶葡萄糖的生产工艺、用途及其发展前景   总被引：2，自引：0，他引：2  

权伍荣  张健  李森 《延边大学农学学报》2004,26(4):313-318

介绍了结晶葡萄糖的生产工艺、主要用途及其发展前景．  相似文献   

“火罐”柿减压处理、低乙烯MA贮藏技术研究   总被引：5，自引：0，他引：5  

黄森  张继澍 《西北农业学报》1996,5(1):82-84

利用减压贮藏的原理,提出了减压处理低乙烯ＭＡ贮藏技术,并利用该技术对陕西优良柿子品种－－火罐柿进行了室温条件下的保鲜贮藏研究。结果表明,减压处理低乙烯ＭＡ贮藏技术甬地抑制火罐柿硬度的下降,延长果实贮藏期。保硬期为４３ｄ,比对照长２４ｄ;贮藏期达９７ｄ,比对照长６７ｄ。  相似文献   

广东省广州市活禽批发市场从业人员H7N9流感“知信行”现状调查     

陈裕华  沈丹  朱建翠  于飞  黄森  王令  张海明  何日文 《中国动物检疫》2018,35(2):1-4

为了解广东省广州市活禽批发市场从业人员对H7N9流感的认知、态度和行为,也为制定针对性的健康教育措施提供依据,2017年4—5月对广州市全部6个活禽批发市场的435名从业人员进行了问卷调查。调查结果显示:318名密切接触人员和117名非密切接触人员对H7N9流感相关知识的总知晓率分别为80.59%和69.60%;在"发现对禽高致病性的H7N9流感病毒""病死禽应该进行深埋或焚烧等无害化处理""外省养殖场发生过H7N9流感疫情"方面,密切接触者的知晓率显著高于非密切接触者(P0.03);获取H7N9流感知识的途径主要有培训,以及电视、网络和海报等宣传媒介;绝大多数市场从业人员认为政府有能力防控H7N9流感,对政府采取的H7N9流感防控措施及对目前的"1110"制度感到满意,认为活禽集中屠宰可行(P0.01);从业人员在预防H7N9流感时,接触禽类后用肥皂或洗手液洗手的占比最高(83.45%),其次是戴手套(69.20%)和穿水鞋(63.91%),而戴口罩(39.77%)和用消毒液消毒手(35.86%)的占比较低。调查认为,广州市活禽批发市场从业人员的H7N9流感知识知晓率较高,但个人防护措施实施不全面。调查结果提示,应充分利用培训,以及电视和网络等优势媒介,强化微信和微博等新兴媒介,加强对H7N9流感防控知识的宣传。  相似文献   

盐碱胁迫对紫花苜蓿和草木樨发芽及出苗的影响   总被引：1，自引：0，他引：1  

卢垟杰  刘淑慧  郭建忠  李森 《种子》2017,(8):83-87

为选择适宜在盐碱土上种植的牧草种类,合理开发和利用盐碱地资源,分别进行室内发芽和室外出苗试验,研究盐碱胁迫对紫花苜蓿和草木樨发芽及出苗的影响.结果表明,各个浓度模拟盐碱胁迫均对紫花苜蓿的发芽有抑制作用;50 mmol/L盐溶液和5 mmol/L碱溶液对草木樨发芽有促进作用,150～250 mmol/L盐溶液和5～25 mmol/L碱溶液其发芽有抑制作用.研究同时表明,紫花苜蓿适宜种植于极轻度盐化土壤和极轻～轻度碱化土壤(pH值为8～9,EC为0.2～0.7mS/cm);草木樨则适宜种植于轻度～重度盐化土壤和中度～重度碱化土壤(pH值为9～10,EC为0.7～1.6 mS/cm).  相似文献   

核桃枝枯病病原菌鉴定及其生物学特性     

刘静  孙翠翠  薛德胜  李保华  练森  王彩霞 《植物病理学报》2020,50(6):774-778

In May 2018,a new shoot dieback disease was found in several walnut orchards in Rizhao,Shandong Province.The fungal pathogen was obtained on PDA plate from diseased walnut shoots using a tissue isolation method.The purified fungal isolates formed white to grey colonies on PDA plate and three single spore isolates SDWa1-SDWa3 were obtained.Based on morphological characteristics and analysis of rDNA internal transcribed spacer (ITS),calmodulin (CAL),translation elongation factor 1-α (TEF1) and β-tubulin (TUB) sequences,the fungal isolates were identified as Diaporthe nobilis,a new pathogen on walnut.The test of Koch's rule confirmed that D.nobilis was the pathogen of walnut shoot dieback.To determine optimal growing conditions for the pathogen,its biological characteristics test was conducted.The results showed that the optimal growth temperature and pH value were at 25℃ and pH 5-9,respectively.The optimum carbon source was glucose,and favourable nitrogen source was peptone.  相似文献   

玉米秸秆“富集深还”与土壤亚表层培肥   总被引：1，自引：1，他引：0  

窦森 《植物营养与肥料学报》2017,23(6):1670-1675

由于长期浅耕，土壤亚表层不仅缺乏有机质，还过于紧实，急需找到一种简单而有效的快速松土培肥方法。本文简要总结了已有3种秸秆还田模式的优缺点，重点介绍了秸秆“富集深还”技术及田间操作要领，以及采用该技术还田的秸秆的分解速率和亚土层培肥效果。富集深还，即将玉米联合收割机抛洒在地表的秸秆，按条带大比例富集，使用专用筒式犁具，以风力注入的方式埋入土壤亚表层 (20—40 cm)。这种模式的最大特点是不扰动土层顺序、不影响第二年种植。秸秆埋置模拟试验表明，秸秆还田330天时，其分解率就达到65%以上，剩余秸秆腐殖化，使土壤有机碳含量增加10%～15%，土壤耕层由原来的15—18 cm增加到30—35 cm。秸秆深还对腐殖物质结构特征没有产生不良影响，对H/C、亲水性等指标还有改善作用，促使黑土胡敏酸结构简单化和年轻化。秸秆深还没有引起第二年玉米产量降低。因此，采用该方法，秸秆能够连年全量还田，实现了种还分离 (种植条带与秸秆深埋条带分离) 与免耕播种的有效结合，可打破犁底层，并快速提升犁底层土壤有机质含量，为土壤亚表层快速培肥及肥沃耕层构建提供技术手段。  相似文献   

快速型黄羽肉鸡饲料利用效率性状的基因组选择研究     

李森  杜永旺  文杰  黄超  陈智武  赵桂苹  郑麦青 《畜牧兽医学报》2021,52(8):2151-2161

旨在探究快速型黄羽肉鸡饲料利用效率性状的遗传参数,评估不同方法所得估计育种值的准确性。本研究以自主培育的快速型黄羽肉鸡E系1 923个个体（其中公鸡1 199只,母鸡724只）为研究素材,采用"京芯一号"鸡55K SNP芯片进行基因分型。分别利用传统最佳线性无偏预测（BLUP）、基因组最佳线性无偏预测（GBLUP）和一步法（SSGBLUP）3种方法,基于加性效应模型进行遗传参数估计,通过10倍交叉验证比较3种方法所得估计育种值的准确性。研究性状包括4个生长性状和4个饲料利用效率性状：42日龄体重（BW42D）、56日龄体重（BW56D）、日均增重（ADG）、日均采食量（ADFI）和饲料转化率（FCR）、剩余采食量（RFI）、剩余增长体重（RG）、剩余采食和增长体重（RIG）。结果显示,4个饲料利用效率性状均为低遗传力（0.08~0.20）,其他生长性状为中等偏低遗传力（0.11~0.35）;4个饲料利用效率性状间均为高度遗传相关,RFI、RIG与ADFI间为中度遗传相关,RFI与ADG间无显著相关性,RIG与ADG间为低度遗传相关。本研究在获得SSGBLUP方法的最佳基因型和系谱矩阵权重比基础上,比较8个性状的估计育种值准确性,SSGBLUP方法获得的准确性分别比传统BLUP和GBLUP方法提高3.85%~14.43%和5.21%~17.89%。综上,以RIG为选择指标能够在降低日均采食量的同时保持日均增重,比RFI更适合快速型黄羽肉鸡的选育目标;采用最佳权重比进行SSGBLUP分析,对目标性状估计育种值的预测性能最优,建议作为快速型黄羽肉鸡基因组选择方法。  相似文献   

Comparison of pregnancy per AI of heifers inseminated with sex-sorted or conventional semen after oestrus detection or timed artificial insemination     

Baris Guner  Gulsum Selcuk  Sevket Guclu  Sultan Sengul  Ismail Altun  Serdal Dikmen  Ahmet Gumen 《Reproduction in domestic animals》2021,56(9):1254-1260

The objective of the study was to compare the fertility after using sex-sorted or conventional semen either with oestrus detection (EST) or timed artificial insemination (TAI) in Holstein heifers. Holstein heifers were randomly assigned to one of the following treatments in a 2 × 2 factorial design. Heifers in the EST group were inseminated with sex-sorted (n = 114) or conventional semen (n = 100) after spontaneous or induced oestrus. Heifers in the TAI, subjected to the 5-day Cosynch+Progesterone protocol (GnRH+P4 insertion-5d-PGF_2α+P4 removal-1d-PGF_2α-2d-GnRH+TAI), were inseminated with sex-sorted (n = 113) or conventional semen (n = 88). Statistical analyses were performed using PROC GLIMMIX procedure of SAS 9.4 (SAS Institute Inc., Cary, NC). Overall P/AI was 60.7% for EST and 54.2% for TAI regardless of types of semen and 68.1% for conventional and 48.9% for sex-sorted semen regardless of insemination strategies. Fertility of heifers inseminated with either sex-sorted (53.5%; 44.2%) or conventional (69.0%; 67.0%) semen did not differ between EST and TAI respectively. Besides, the interaction between the semen type and the insemination strategy was not significant for P/AI. The embryonic loss was significantly greater with sex-sorted semen (17.1%) compared to conventional semen (1.6%). There was no sire effect with sex-sorted semen on P/AI (52.6% vs. 46.2%) and embryonic loss (16.4% vs. 18.0%). As expected, sex-sorted semen resulted in more female calves (89.8% vs. 51.6%) than conventional semen. Thus, sex-sorted semen can be used with 5-day Cosynch+Progesterone protocol to eliminate the inadequate oestrus detection and to increase female calves born in dairy heifers.  相似文献   

Synovial fluid analysis and bacterial findings in arthritic joints of juvenile male camel (Camelus dromedarius) calves     

Bani Ismail Z  Al-Rukibat R  Al-Tarazi Y  Al-Zghoul MB 《Journal of veterinary medicine. A, Physiology, pathology, clinical medicine》2007,54(2):66-69

Eighteen synovial fluid samples from 11 male dromedarian calves, 9-12 month old, were analysed cytologically and bacteriologically. Calves were lame and all joints were grossly swollen. The mean +/- SD of total nucleated cell count was 7970 +/- 5000 cells/microl (range 2800-20,000 cells/microl). Polymorphonuclear (PMN) leucocytes were the predominant cell type. The mean +/- SD of absolute and percentages of each cell type were as follows: PMN leucocytes 5518 +/- 3600 cells/microl and 68 +/- 19%, monocytes/macrophages 1600 +/- 1120 cells/microl and 26 +/- 17%, lymphocytes 830 +/- 140 cells/microl and 8 +/- 7%, and red blood cell 350 +/- 130 cells/microl. The mean +/- SD of total protein concentration was 3.5 +/- 1 g/dl (range 2.5-5 g/dl). The most commonly isolated bacteria were non-haemolytic streptococci spp., followed by Arcanobacterium pyogenes and Staphylococcus aureus. No bacterial growth was obtained in eight samples and non-revealed Mycoplasma spp.  相似文献   

Comparative pharmacokinetics of marbofloxacin in healthy and Mannheimia haemolytica infected calves     

Ismail M  El-Kattan YA 《Research in veterinary science》2007,82(3):398-404

The pharmacokinetics of marbofloxacin were investigated in healthy (n=8) and Mannheimia haemolytica naturally infected (n=8) Simmental ruminant calves following intravenous (i.v.) and intramuscular (i.m.) administration of 2 mg kg(-1) body weight. The concentration of marbofloxacin in plasma was measured using high performance liquid chromatography with ultraviolet detection. Following i.v. administration of the drug, the elimination half-life (t(1/2 beta)) and mean residence time (MRT) were significantly longer in diseased calves (8.2h; 11.13 h) than in healthy ones (4.6 h; 6.1 h), respectively. The value of total body clearance (CL(B)) was larger in healthy calves (3 ml min(-1) kg(-1)) than in diseased ones (1.3 ml min(-1) kg(-1)). After single intramuscular (i.m.) administration of the drug, the elimination half-life, mean residence time (MRT) and maximum plasma concentration (C(max)) were higher in diseased calves (8.0, 12 h, 2.32 microg ml(-1)) than in healthy ones (4.7, 7.4 h, 1.4 microg ml(-1)), respectively. The plasma concentrations and AUC following administration of the drug by both routes were significantly higher in diseased calves than in healthy ones. Protein binding of Marbofloxacin was not significantly different in healthy and diseased calves. The mean value for MIC of marbofloxacin for M. haemolytica was 0.1+/-0.06 microg ml(-1). The C(max)/MIC and AUC(24)/MIC ratios were significantly higher in diseased calves (13.0-64.4 and 125-618 h) than in healthy calves (8-38.33 and 66.34-328 h). The obtained results for surrogate markers of antimicrobial activity (C(max)/MIC, AUC/MIC and T > or = MIC) indicate the excellent pharmacodynamic characteristics of the drug in diseased calves with M. haemolytica, which can be expected to optimize the clinical efficacy and minimize the development of resistance.  相似文献