乙烯脱除剂处理对杏果实常温贮藏品质的影响

以新疆库买提杏果实为试材,研究了常温（25℃）条件下乙烯脱除剂处理对杏果实贮藏品质的影响。结果表明,乙烯脱除剂处理可有效降低杏果实贮藏前期的呼吸及乙烯释放速率,减缓细胞膜透性、MDA的上升及VC含量的下降速度,减少贮藏期内营养物质的消耗,延长杏果实的贮藏保鲜期,但贮藏5天后效果不明显。     

大蕉幼雄花易碎胚性愈伤组织长期继代培养及其植株再生

大蕉未成熟雄花接种到胚性愈伤组织诱导培养基中,4～5个月后可诱导出胚性愈伤组织,并可在继代培养基上长期增殖。这些继代培养了6年多的松软易碎的胚性愈伤组织转移到含有0.2 mg/L 6-BA的分化培养基中,可诱导出芽,得到了53株再生植株,这些再生植株可进一步扩大繁殖。组织学切片证明长期继代培养的愈伤组织维持了胚性的状态。     

马铃薯通风储藏库加湿系统设计与试验

为解决现有马铃薯通风储藏库加湿系统选型参数标准模糊和加湿方式无法随库内环境参数变化进行自动调节等问题,设计了一套马铃薯通风储藏库自动加湿系统。在现有马铃薯储藏库基础上,考虑马铃薯生理特性,该加湿系统选择PLC S7-200为主控制器,并运用控制变量法进行试验设计,采用Origin数据分析软件对各影响因素与入口风速和相对湿度之间的关系进行单因素试验分析,研究加湿帘厚度、加湿泵功率和风机风速对储藏库加湿效果的影响。硬件选型试验表明,该储藏库的最佳参数组合为湿帘厚度45cm、加湿泵功率70W、风机风速16m/s,当风速达到16m/s时能够达到完全穿透效果。加湿系统应用试验证明,系统能够正常工作,并且将库内相对湿度维持在95%左右,储藏后马铃薯平均失重率为3.70%,满足马铃薯储藏的加湿需求,且系统可根据库内环境参数的变化进行相应调整,使马铃薯保持较充足的水分和较低的失重率,从而保证储藏库内环境适合马铃薯储藏。     

无源蓄冷控温运输箱设计与试验

针对蓄冷运输箱信息化程度低、控温时间短、控温困难等问题,设计了一款集控温、远程监控、定位、故障诊断等功能于一体的蓄冷运输箱。以脐橙为试验对象,结合能耗模型,对蓄冷控温箱控温性能进行了研究。结果表明,箱内各截面温度不均匀系数分别为0.38、0.47、0.78,温度极差最大值为2.8℃,均匀性较好;当蓄冷剂用量为180 kg,预冷脐橙660 kg,在外部环境平均温度26.39℃的条件下,总控温时长为122 h,风机共执行控温21次,且随着蓄冷量减少,风机开启控温所用时间呈指数上升趋势,决定系数不小于0.928 0;结合能耗模型分析得出,该箱体在广州夏季高温环境下可控温5 d以上,能够满足远距离运输要求。     

药剂结合低温贮藏对青花菜品质的影响

研究了0℃包装贮藏条件下,化学药剂处理对单花球青花菜品质的影响.研究结果表明,赤霉素(GA3)、苯甲酸钠(SBN)、6-苄基腺嘌呤(6-BA):均能延缓青花菜的品质下降,其中以40 mg/kg 6-BA+0.2%SBN处理的效果最好,在药后30 d时,叶绿素含量仅下降9.8%,未表现出黄化,失水率仅为2.25%,花球形态紧密充盈,保持了较好的商品性.     

一种采用无线数据传输方式的储粮仓群测温系统

基于无线收发芯片和1-Wire总线数字温度传感器,实现了可进行无线数据传输的大型储粮仓群温度监测系统。该系统包括主机和信号采集分机,主机负责管理每个粮仓的温度信号采集分机,定时或根据操作者指令向分机发出数据传输指令,各个粮仓分机根据收到的指令进行温度数据的传输。该系统在继承了全数字粮仓测温系统硬件结构简单、安装及维修方便等优点的基础上,实现了测温数据的无线传输,适于在大型分散式储粮仓群以及不便于布线的粮库中应用。     

虾夷扇贝精子的主要生理特性与低温保存

试验结果表明,虾夷扇贝精子的最适盐度为23.2～32,最适pH 7.0～8.5.4℃,未稀释精液样品保存5 d后,精子仍有(26±4)%的活力,而经海水稀释后的精液保存70 h后,最高活力仅为(11±1.41)%,用抗冻液稀释的精液,4℃保存5 h后,得到最高的精子活力仅为(24.7±4.16)%.添加抗冻剂后,-18℃的保存效果明显低于4℃保存的未稀释样品.用4℃保存的未稀释精液与栉孔扇贝卵子进行杂交试验,保存3 d内的精子获得的授精率与对照组差异不显著(P0.05).杂交组的幼虫可以正常发育至D形幼虫,与自交组无区别.     

温度、丙烯和1-MCP对西洋梨果实乙烯合成和乙烯受体ETR1同源基因表达的影响

研究了贮藏温度、丙烯和 1 MCP (1-甲基环丙烯 )处理对帕斯—卡桑 (Passe -Crassane)西洋梨果实成熟的影响。结果表明 :低温可促进果实的乙烯合成 ,未经低温处理的果实 ,用丙烯处理 ,不能正常合成乙烯。丙烯促进乙烯合成的效应随冷藏时间延长而增强。1 MCP处理可抑制冷藏果实的乙烯合成。定量PCR分析结果表明 ,果实中乙烯受体ETR1同源基因的表达不受低温的调节 ;但冷藏后升温或升温后用丙烯处理时 ,mRNA含量降低     

Effects of Pre-Stratification Storage Conditions on Black Walnut Seed Post-Stratification Germination Capacity

The objective of this work was to quantify changes in the germination capacity of Juglans nigra seeds following storage and then artificial stratification. Seeds were stored at 5 and –20 °C under 5% and 14% internal moisture content (IMC) for 0, 8, 10, and 12 months under conditions with oxygen or under vacuum. Germination percentage (GP) was affected by storage temperature, IMC, and storage period. Seeds stored with 5% IMC succeeded in germinating regardless of the temperature. Seeds stored with 14% IMC did not germinate (–20 °C) or germinated during storage (5 °C). The GP was reduced with the time of storage in seeds at –20 °C and 5% IMC and this effect was avoided in storage under vacuum. In conclusion, the germination capacity of black walnut seeds did not change for up to 12 months at low above-zero temperature and low IMC (5 °C, 5% IMC), being the most cost-effective alternative for long-term storage of black walnut seeds in commercial nurseries. Vacuum storage avoided the decrease of around 50% in average germination capacity of seeds stored for a year at –20 °C.     

Impact of sampling and storage technique,and duration of storage,on the composition of fresh grass when analysed using near‐infrared reflectance spectroscopy

The objective of this study was to examine the effect of sampling technique (pluck or cut), storage duration (immediate analysis, 24‐h or 48‐h), storage temperature (ambient or chilled) and storage conditions (air present, air excluded or breathable) on the composition of fresh grass sampled from a sward managed to simulate grazing. Treatments were repeated across four sampling dates, with grass samples stored in grip seal bags prior to analysis using near‐infrared reflectance spectroscopy. Grass sampled by ‘pluck’ had a higher crude protein and ME content, and a lower acid detergent fibre (ADF) content, compared to that sampled by ‘cut’. Grass stored for 48 h had a lower water soluble carbohydrate (WSC) and ME content and a higher ADF content than for immediate analysis. Samples stored for 24 h did not differ from immediate analysis. Grass stored at ambient temperature had a lower WSC and ME content compared to immediate analysis. Grass stored under ‘breathable’ conditions had a lower ME content and higher ADF content than immediate analysis or samples stored with air present or air excluded. It is recommended that grass for analysis should be sampled by cutting, stored chilled (4°C) in a sealed bag to minimize exposure to oxygen and analysed within 24 h of harvest.