黄花梨果实冷藏适温的研究

黄花梨果实在０℃、４℃、８℃下进行贮藏试验，试验结果表明：低温可以抑制果实的呼吸作用，延缓呼吸高峰的出现，减少果实营养物质的消耗和色素的降解，延缓果实的成熟衰老；黄花梨果实的冷藏适温是４℃，在本试验条件下可贮藏６０ｄ，基本上保持原果的风味、颜色和品质，好果率仍保持１００％，失重率１．５０％；冷藏出库后采取逐渐升温或加抗氧化剂处理，在常温下７ｄ内可有效地延长果实货架寿命，尤以加抗氧化剂处理效果显著；无包装的黄花梨果实随着贮藏温度的升高，贮藏时间的延长，果实的失重率增加；而用聚乙烯薄膜袋包装则能显著地减少水分损失     

蚕蛹油的成分、营养价值及提取工艺研究进展

从丝绸工业的副产品即蚕蛹中提取的蚕蛹油作为昆虫油脂中的一种,具有重要的营养和经济价值。综述了蚕蛹油的研究进展,包括蚕蛹油的组成及营养价值研究、提取工艺研究、脂肪酸成分分析方法及精制研究、应用现状及前景等。     

我能这样设定欠条吗

编辑同志: 我是一名饲料经营者,在平时的生意中难免有些用户存在一些欠款而久赊不还.我便自拟了一份欠条,并打印出来,让每位欠款者自定还款日期,签上自己的名字并盖章或按手印.     

块状紫山药新品种苏蓣2号选育及全程机械化栽培技术

利用辐射诱变育种技术筛选出优质、高效、专用并适于全程机械化栽培的块状紫山药新品种———苏蓣2号。农机、农艺融合,应用苏鲁2个厂家生产的4种机械可完成旋耕、起垄、播种、中耕、追肥、施药、除草、培土、切蔓和收获等10种主要生产工序。单件机械的作业效率为4~5 hm2/d,山药主产区、特菜区节本增效为3.75万元/hm2以上。该全程机械化栽培技术操作简单,切实可行,易于推广。     

Effects of Dietary Ampitheoe sp. Powder on Growth and Lipid Contents of Litopenaeus vannamei北大核心CSCD

This experiment was conducted to investigate the effects of dietary Ampitheoe sp. powder on the growth and the contents of astaxanthin, triglyceride (TG), total cholesterol (TCHO) and fatty acids of Litopenaeus vannamei. A total of approximately 6 777 L. vannamei with an initial body weight of (1. 80 ± 0.72) g were randomly divided into 3 groups, and there were 3 replicates (753 shrimp per replicate) in each group. Those shrimp fed diets containing 0 (D0 group), 8. 25% (D8. 25 group) and 33% (D33. 00 group) Ampitheoe sp. powder, respectively. The feeding trial lasted for 40 days. The results showed as follows: 1) the final body weight, weight gain rate, specific growth rate, yield and survival rate in D33.00 group were significantly higher than those in D0 group (P <0.05), whereas the feed conversion ratio was significantly lower than that in D0 group (P <0.05) . However, there was no significant difference between D33.00 group and the D8. 25 group in those indexes (P >0.05) . 2) The astaxanthin content in carapace, hepatopancreas and muscle of L. vannamei in D8.25 and D33. 00 groups was significantly higher than that in D0 group (P < 0. 05); that in D33.00 group was significantly higher than that in D8. 25 group (P < 0. 05) . 3) TG content in haemolymph, hepatopancreas and muscle in D8. 25 and D33. 00 groups was significantly lower than that in D0 group (P < 0.05); the TCHO content in hepatopancreas in D8. 25 group was significantly higher than that in D0 and D33.00 groups (P <0.05); TCHO content in muscle in D33.00 group was significantly higher than that in D0 group (P <0.05) . 4) The contents of eicosapentaenoic acid (EPA) and arachidonic acid (AA) in hepatopancreas in D33.00 group were significantly higher than those in D0 group (P <0.05) . The EPA content in muscle in D33.00 group was significantly higher than that in D0 group (P < 0. 05) . In conclusion, adding Ampitheoe sp. powder into the diet can improve the growth performance, the contents of astaxanthin, EPA and AA in L. vannamei, and affect the accumulation of TG and TCHO, which can be used as a functional diet in aquaculture. Considering the cost, the supplementation level of 8. 25% Ampitheoe sp. powder is more appropriate. © 2023 Chinese Journal of Pediatric Surgery. All rights reserved.     

铜的来源和水平对生长猪生长性能禾粪铜排出量的影响

选用平均体重29．6kg的三元杂（杜×大×长）生长猪144头，按随机区组设计分为6个处理。饲粮中分别添加0、100、200mg／kg硫酸铜、200mg／kg碱式氯化铜、100mg／kg小肽铜、100mg／kg复合氨基酸螯合铜（以铜含量计）。结果表明：100mg／kg小肽铜和100mg／kg复合氨基酸螯合铜均能有效提高生长猪日增重和日采食量，其促生长效果与200mg／kg硫酸铜无显著（P〉0．05）差异，而粪中铜含量分别下降了36．8％和48．4％（P〈0．05）。     

曲线封边机结构分析及其封边系统结构设计

阐述了曲线封边机的封边系统,对该系统的滚子链传动进行了设计。     

非洲猪瘟的诊断要点及防控措施

非洲猪瘟是一种由非洲猪瘟病毒引起的高传染性、高死亡率急性猪疫病,控制不及时死亡率可达100%。受2018年非洲猪瘟的影响,我国养猪市场迅速紧缩,大部分小规模的养殖场损失惨重,直接以破产的方式终结。研究非洲猪瘟的诊断及其防控对于控制非洲猪瘟疫情有着重要的意义。     

高速摄像技术在我国农业机械领域的应用

高速摄像技术是一项高科技测量技术,其应用已从军事、航空航天和电影等领域延伸到农业机械领域.为此,基于高速摄像技术的特点,系统分析了高速摄像技术在农业机械领域的应用研究概况,并探讨了其存在的问题和发展趋势.     

转Bt基因棉花品种与绿盲蝽危害相关的几个生理指标特征分析

研究了转Bt基因棉不同品种的生理代谢特征及其与棉盲蝽危害的关系。结果表明:在供试的6个棉花品种中,棉花绿盲蝽发生量和危害程度以转Bt基因杂交棉品种最高,转Bt基因常规棉品种次之,非转基因常规棉品种最低。顶芽和幼蕾的可溶性糖含量与绿盲蝽发生量和危害程度呈显著或极显著的正相关,而缩合单宁含量和PLA活性与之则呈显著或极显著的负相关。顶芽和幼蕾的可溶性糖含量以转Bt基因杂交棉品种最高,转Bt基因常规棉品种次之,非转基因常规棉品种最低;缩合单宁含量、PLA活性以非转基因常规棉品种最高,转Bt基因常规棉品种次之,转Bt基因杂交棉品种最低。棉花植株氮素积累量与顶芽和幼蕾的可溶性糖含量呈显著或极显著正相关,而与缩合单宁含量和PLA活性呈显著或极显著的负相关;蕾期和铃期的氮素积累量以转Bt基因杂交棉品种最高,转Bt基因常规棉品种次之,非转基因常规棉品种最低。上述结果表明,转Bt基因棉花品种(尤其是转Bt基因杂交棉品种)在蕾期和铃期的氮素积累量高,引起了顶芽和幼蕾的可溶性糖含量提高,缩合单宁含量和PLA活性降低。