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[目的]为客观评价龙井茶的劣变提供依据。[方法]选择了几种典型具有代表性的包装材料进行了茶叶贮藏试验,采用多元线性回归研究了主要生化成分（含水量、茶多酚、氨基酸、水溶性浸出物、抗坏血酸和咖啡碱）与感官品质的相关性。[结果]抗坏血酸的氧化程度与龙井茶的感官品质劣变程度关系最为密切,达到了极显著相关性（0.997,P〈0.01）,并且两者存在显著的线性关系：即y（感官品质）=70.255＋93.776x（抗坏血酸含量）。[结论]可以由抗坏血酸的含量表征龙井茶品质劣变程度,相比带有主观因素的感官评价更精确。 相似文献
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塑料薄膜包装对冷藏黑宝石李果实品质的影响 总被引：3，自引：1，他引：2
以黑宝石李为试材,在冷藏条件下研究了5种塑料薄膜包装对其果实品质及保鲜效果的影响。试验结果表明,0.03 mmPVC袋的果实品质最好;0.02,0.05 mm PE袋的好果率也在92%以上,但果实有轻微冷害,品质受到一定程度的影响;0.05 mmPVC和高渗CO2保鲜袋的保鲜效果最差,冷害和腐烂较重。与贮藏前相比,贮藏结束时,黑宝石李果实硬度和可滴定酸含量有所下降,可溶性固形物含量和果肉相对电导率有所上升,但处理之间差异不明显。 相似文献
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对《兽药产品说明书范本》编制原则、特点及使用说明进行了详细阐述。对于读者理解、领会和执行《兽药产品说明书范本》将起到较好的帮助作用。 相似文献
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为初步探讨套餐肥对高山大白菜种植区域中度酸化土壤的修复效果,设置套餐肥、营养土+复合肥和农户习惯施肥(CK)3个处理进行了土壤修复大田对比试验。试验结果表明,相较营养土+复合肥及CK处理,套餐肥处理667 m2产量分别增加1080.0、1813.0 kg,增幅13.7%、25.4%;667 m2纯收入分别增加572.8、418.0元,增幅为21.8%、14.0%;套餐肥处理的土壤pH值较试验前提高0.20,较营养土+复合肥及CK处理分别提高0.07、0.16;有机质含量较试验前提高1.2 g/kg,较营养土+复合肥及CK处理分别提高0.90、0.01 g/kg。说明套餐肥处理不仅增产增收效果明显,而且对土壤pH值及有机质含量有提升作用,可以在高山蔬菜产区进一步优化推广使用。 相似文献
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网络监测系统的设计与实施 总被引：1，自引：0，他引：1
基于目前网络中心管理的需要，设计了一种被动监测子网络到网络中央通信状况的监测系统；该系统充分利用局域网内截获数据和主动探测的原理，并结合了多线程的思想。 相似文献
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Recently, the immune stimulation properties of cereal arabinoxylans (AX) have been reported. The aims of this study were to identify the molecular features and potential immune stimulation activities of AX and enzymatic modified arabinoxylan (AXE) from the pentosan fraction of wheat flour.The results of molecular characterization of AX and AXE show that AXE contains a larger portion (85.7%) of low Mw arabinoxylans (≤25 kDa) and has a higher degree of branch substitution (0.81 ± 0.01) compared to AX (49.5% and 0.62 ± 0.02). In in vitro testing, the ability of AX and AXE to stimulate immune cells, as measured by NO2− production by U937 cells and IL-8 secretion by Caco-2 cells were found to be dose–dependent in the range tested (100–5000 μg/mL p ≤ 0.05). AXE showed a greater activity at each concentration (100–5000 μg/mML) than AX (p ≤ 0.05).In conclusion, the greater immune stimulating activity of AXE may be associated with its low Mw (≤25 kDa) and a higher degree of branch substitution (0.81 ± 0.01). 相似文献
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[目的]以设施番茄为例,旨在探讨不同套餐肥肥效,以期能为西安市设施番茄优质高效生产提供一定的理论依据。[方法]试验采用田间试验方法,设置T1(施用济邦牌番茄套餐肥)、T2(施用欣金谷牌番茄套餐肥)和T3(CK,即常规施肥对照,施用元丰牌复合肥)3个试验处理,研究了不同处理对番茄产量、品质及经济效益的影响。[结果]结果表明：(1)经过一季番茄栽培后,处理T1、T2、T3对土壤有机质含量影响不明显,但处理T1、T2有助于降低设施碱性土壤的pH和电导率;(2)处理T3的番茄植株株高、径粗、株幅及茎叶干重等指标均高于处理T1、T2,但番茄单果重、产量、可溶性固形物和维生素C含量以及经济效益却低于处理T1、T2。[结论]总体而言,施用两种套餐肥均优于常规施肥,但施用济邦套餐肥肥料成本更低,经济效益更高,能更好实现节本增效和增收目的。 相似文献
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J.S. Pachpute 《Agricultural Water Management》2010,97(9):1251-1258
A package of water management practices including pitcher irrigation method and water conserving techniques of manure application and mulching is experimented for sustainable growth and improved production of cucumber crop in Makanya village in North Eastern Tanzania. The increase in total yield due to package of water management practices is 203 per cent and water use efficiency obtained is 12.06 kg m−3. The seasonal water requirement of cucumber crop under package of water management practices ranges from 146.30 to 198.10 mm, which is on an average 4.19 times less as compared to control treatment of can irrigation. The irrigation interval in package of water management practices is 4.9 times higher than the can irrigation method. The water and labour uses are reduced by 75.9 and 73 per cent, respectively in package of water management practices. The results showed that the self-regulative nature of pitchers and moisture retention by water conserving techniques is helpful in mitigating water stress in crop root zone. The moisture retention period in soil is increased assisting reduction of labour hours required in irrigation. In local context, the water management practices included in the package are easy to understand, adopt, operate and maintain. 相似文献