排序方式: 共有52条查询结果,搜索用时 15 毫秒
1.
为了研究不同月份平茬对柠条根系贮存常规性营养物质和可溶性性营养物质的影响。采用饲料监测方法测定常规营养物质,参考《植物生理学实验指导》和《植物生理生化实验原理和技术》方法测定可溶性营养物质。结果表明,随着平茬时间推迟,柠条根系蛋白质含量呈逐渐下降的趋势,淀粉与脂肪之间相互转化协调逆境变化维持生命或再生发挥作用;可溶性碳水化合物是柠条根系主要贮藏的营养物质,对柠条不同月份平茬逆境胁迫下反应比较敏感;可溶性糖类与可溶性淀粉的比例逐渐随着月份增加,有利于植株抗击冻害;萌动期、初霜期平茬对柠条根系营养物质影响较大。柠条生长季平茬建议在4—8月进行。 相似文献
2.
【目的】通过生长季不同月份平茬试验,研究及了解不同月份平茬对柠条根系贮存常规性营养物质和可溶性性营养物质的影响。【方法】常规营养物质测定按照饲料监测方法进行,可溶性营养物质参考《植物生理学实验指导》和《植物生理生化实验原理和技术》方法进行测定。【结果】随着平茬时间推迟,柠条根系蛋白质含量逐渐下降的趋势,淀粉与脂肪之间相互转化协调逆境变化维持生命或再生发挥作用;可溶性碳水化合物是柠条根系主要贮藏的营养物质,对柠条不同月份平茬逆境胁迫下反应比较敏感;可溶性糖类与可溶性淀粉的比例逐渐随着月份增加,有利于植株抗击冻害;萌动期、初霜期平茬对柠条根系营养物质影响较大。【结论】柠条生长季平茬建议在4-8月份进行。 相似文献
3.
龚希章 《上海海洋大学学报》2000,(4):334-338
本文探讨了在网络环境下建立渔业数据库管理及检索系统的技术问题,并应用ASP、ADO技术开发了基于SQL Serer7.0数据库的Web应用程序。文中给出了利用该技术连接数据库并调用存储过程的一个编程实例。 相似文献
4.
5.
6.
Johanna Lindahl Anne-Marie Dalin Gesa Stuhtmann Jane M Morrell 《Acta veterinaria Scandinavica》2012,54(1):40
Background
One of the challenges faced by equine breeders is ensuring delivery of good quality semen doses for artificial insemination when the mare is due to ovulate. Single Layer Centrifugation (SLC) has been shown to select morphologically normal spermatozoa with intact chromatin and good progressive motility from the rest of the ejaculate, and to prolong the life of these selected spermatozoa in vitro. The objective of the present study was a proof of concept, to determine whether fertilizing ability was retained in SLC-selected spermatozoa during prolonged storage.Findings
Sixteen mares were inseminated with SLC-selected sperm doses that had been cooled and stored at 6°C for 48 h, 72 h or 96 h. Embryos were identified in 11 mares by ultrasound examination 16–18 days after presumed ovulation.Conclusion
SLC-selected stallion spermatozoa stored for up to 96 h are capable of fertilization. 相似文献7.
Panagiotis A. Eliopoulos Georgia Z. PrasodimouAikaterini V. Pouliou 《Crop Protection》2011,30(8):1097-1102
Mortality effects of low temperature exposure to −16 °C were investigated on larvae and adults of the grain beetles Tribolium confusum Jacquelin du Val (Coleoptera: Tenebrionidae), Oryzaephilus surinamensis (L.) (Coleoptera: Silvanidae) and Trogoderma granarium (Everts) (Coleoptera: Dermestidae), in the laboratory. The main effects and interactions of exposure time (0.2, 0.5, 1, 2, 4, 8, 12, 24 and 48 h), developmental stage (larva and adult) and individual’s age (young and old) were examined. After 4 h of exposure 100% mortality has been achieved in most of the treatments. The only exceptions were that of old larvae of T. granarium and O. surinamensis, and adults of T. granarium which needed 48, 8, and 24 h, respectively. T. granarium was the most cold-hardy species irrespective of developmental stage, and age, followed in decreasing order by O. surinamensis and T. confusum. Younger adults were generally more susceptible to cold in the cases of O. surinamensis and T. confusum. On the contrary, older adults of T. granarium suffered higher mortality than younger ones. Larvae of T. granarium were generally more cold-tolerant than adults but the opposite pattern was observed in O. surinamensis and T. confusum. Main effects of exposure time, developmental stage and individual’s age on mortality proved to be significant for all species, with the exception of T. granarium where the effect of developmental stage proved to be insignificant. Lethal time values were estimated via probit analysis. Values of LT50 ranged between 0.7 and 1.0 h for T. confusum, 0.7-1.9 h for O. surinamensis and 1.2-3.4 h for T. granarium. Our results are discussed with findings from relevant studies and the possibility of including extreme cooling to IPM programs against stored product pests is investigated. 相似文献
8.
Aeration strategy for controlling grain storage based on simulation and on real data acquisition 总被引:1,自引:0,他引:1
Daniela de Carvalho Lopes Jos Helvecio Martins Adílio Flauzino Lacerda Filho Evandro de Castro Melo Paulo Marcos de Barros Monteiro Daniel Maral de Queiroz 《Computers and Electronics in Agriculture》2008,63(2):140-146
In this work a new control strategy for grain aeration systems was proposed. This strategy was implemented in a software package called AERO and relates four conditions which depend on real time data acquisition and on the process simulation. The main advantage of AERO controller is that it can be used in different geographic regions, during different seasons and with different aeration systems, automatically adjusting its set points. The objectives of AERO controller are to equalize the temperatures inside the bin, to cool the grain mass whenever is possible and to maintain the moisture content under safe conditions. The results showed that the proposed strategy is efficient to achieve these objectives. Moreover, significant energy saving has been achieved with the AERO controller. 相似文献
9.
两种重要储粮害虫的无公害防治技术研究 总被引:2,自引:2,他引:0
通过3种虫生真菌、2种苏云金杆菌粉剂(Bt-1和Bt-2)及48%乐斯本乳油对生活在小麦中的谷蠹、长角扁谷盗进行毒力试验,结果表明:Bt-1粉剂对两种储粮害虫具有较高的毒力,对谷蠹LD50为15.75ug/g,对长角扁谷盗LD50为8.06ug/g;三种虫生真菌对这两种害虫侵染力较弱,最高校正死亡率仅为55.0%。48%乐斯本乳油对两种储粮害虫的熏蒸效果较好,在0.80ml/L浓度下,谷蠹、长角扁谷盗死亡率均达到100.0%。 相似文献
10.