植物精油抗菌乳状液涂膜对鸡蛋的保鲜效果

为了延长鸡蛋的保藏期,采用牛至、大蒜、生姜、丁香提取油分别复配成抗菌乳状液对鸡蛋进行涂膜保鲜试验,在5周的贮藏期间,通过对鸡蛋各项感官指标和内部品质指标变化的分析发现,上述植物精油乳状液保鲜剂保鲜效果均优于对照组,尤其以牛至精油乳状液与丁香精油乳状液保鲜效果最好。经牛至精油乳状液和丁香精油乳状液涂膜保鲜过的鸡蛋,在30℃,80%～90%相对湿度情况下,好蛋率为100%,失重率分别为2.824%和2.656%,蛋黄系数为0.1965和0.2129,哈夫单位为40.311和41.312。     

利用Zernike矩计算储粮害虫图像倾斜角度

自动检测粮粒外部害虫是粮虫领域的研究热点。由于储粮害虫图像的一些无量纲的特征丧失了旋转不变性,为了利用这些无量纲的特征形成适于分类的最优知识库,必须计算储粮害虫图像的倾斜角度。分析了利用Zernike矩计算图像倾斜角度的原理,借助Zernike矩旋转不变性,提出了利用Zernike矩计算无明显直线的储粮害虫图像的倾斜角度的方法。试验证明,对于无明显直线的储粮害虫图像,利用Zernike矩能够很好地进行倾斜检测,倾斜角度计算准确度高,且该方法还具有对噪声不敏感的特性,对于其他无明显直线的图像也同样适用。     

三疣梭子蟹不同包装方式保鲜效果的比较

三疣梭子蟹属宁波名特优水产养殖品种,但三疣梭子蟹在保藏加工中容易发生褐变,哪种包装方式可抑制梭子蟹褐变并有效延长产品保鲜期,是一个值得探讨的问题。该文对三疣梭子蟹真空包装、气调包装和涂膜包装的保鲜效果进行比较。结果表明：气调包装气体配比为CO2 50%,N2 50%的保鲜效果较好;但真空包装与气调包装和涂膜包装的保鲜效果相比,0～4℃下,真空包装可有效抑制梭子蟹腮部和足部褐变并延长三疣梭子蟹保鲜期,保鲜效果好于气调包装和涂膜包装。     

黑龙江省作物生长季农田土壤水分分区研究

依据对农田土壤水分状况的表征程度 ,确定了包括土壤水分常数、土壤蓄水量以及土壤蓄水量盈亏值三类共计 9个指标 ,对黑龙江省农田土壤水分盈亏状况进行了较为客观的分区。分区结果表明 ,整个生长季全省呈现西亏东盈中部正常的特点 ,且依不同生长季时段和土层厚度有较大差异 ,为指导黑龙江省农业生产提供重要依据。     

链霉菌3-10发酵液及提取物的稳定性研究

为合理利用链霉菌3-10的代谢产物,本研究采用不同极性的有机溶剂提取链霉菌3-10发酵液中的抗真菌物质并得到发酵液的提取物.在此基础上测定了温度、紫外线辐射、酸碱度和贮存条件对3-10抗真菌物质稳定性的影响.结果表明,乙酸乙酯为最佳提取溶剂,链霉菌3-10发酵液的乙酸乙酯提取物对灰霉病菌菌丝生长的抑制作用最强,提取后余...     

Effect of Time and Storage Conditions on Albumen Quality of Eggs from Hens Fed Vanadium

This experiment was conducted to study the albumen quality of eggs from 60-wk-old hens fed 0 or 10 ppm supplemental vanadium (V) as influenced by storage conditions and length of storage time as well as the effect of V feeding and withdrawal on albumen quality over time. After hens were fed V for 23 d, eggs were collected and stored in the laying house at ambient temperature or in a cooler (15.5°C, 60% relative humidity) for 1, 3, 5, or 7 d. Eggs were then broken, and Haugh units (HU) were calculated. Hens fed V had poorer albumen quality than eggs from birds fed the control diet (62.5 vs. 72.1 HU, respectively). Eggs stored in the layer house had poorer albumen quality than those stored in the cooler (63.9 vs. 70.7 HU, respectively). Increasing storage time also had a detrimental effect on albumen quality. Quality declined more rapidly in eggs stored at ambient temperature than in the cooler, but it was not influenced by dietary V. Thus, there was no 3-way interaction as hypothesized.After 7 d of feeding hens 10 ppm V, their eggs had poorer albumen quality than eggs from hens fed the control diet. Time analysis indicated that the significant negative effect to albumen quality occurred in V-fed hens on d 1, 2, 5, and 12 of supplementation. When these hens were then switched to the control diet after 30 d of V supplementation, albumen quality continued to decline for 2 d but did not differ by d 6 from that of eggs from hens given the control diet.     

产量与施肥及保鲜剂对红地球葡萄贮藏品质的影响

对红地球葡萄贮藏品质影响最大的原因是葡萄果梗的新鲜度,贮藏120天,叶/果＜35(产量为45 000kg/mh2左右)干梗指数为叶/果=50(22 500 kg/hm2左右)的15倍多.硫酸钾三元复合肥.和生物菌肥能够明显抑制干梗;采前液体保鲜剂与红地球葡萄保鲜剂复配应用,在(-0.5 0.5)℃条件下,贮藏120天漂白率、腐烂率和干梗率分别为3.33%、0%和4.12%.     

对影响茶叶贮藏质量因素的分析

运用"正交试验法"分析了影响茶叶贮藏品质变化的4个主要因素,即温度、氧气、水分、光照与茶叶品质之间的关系.结果表明,各因素对茶叶贮藏品质的影响程度因指标、原因不同而异.综合来看,表现依次为温度的影响＞氧气的影响＞水分的影响＞光照的影响;因素间交互效应的存在,使得在控制一个因素时,其他因素的影响也相应受到一定程度的抑制.     

Prevalence of equine polysaccharide storage myopathy and other myopathies in two equine populations in the United Kingdom

The aim of this study was to determine the prevalence of equine polysaccharide storage myopathy (EPSM) in two populations of horses in the UK. Biopsy specimens from 94 horses presented to an abattoir (population 1), and 46 horses with neuromuscular disorders presented to a university referral hospital (population 2) were obtained over a period of 4 years. Histological sections were examined by a veterinary pathologist for lesions including abnormal polysaccharide inclusions in myofibres.In population 1, a diagnosis of EPSM was made in 8% and non-specific myopathy in 33% of horses. In population 2, a diagnosis of EPSM was made in 22%, equine motor neurone disease (EMND) in 15% and non-specific myopathy in 37%. Within each population there was no difference in age, sex or breed distribution and muscle disease diagnosis. However, populations differed from each other in age and breed distributions and muscle disease diagnosis. EPSM was found in draft, Warmblood and related breeds and was diagnosed for the first time in cob-types. EMND was reported in 7/46 horses presented for neuromuscular disease and weakness, representing an important diagnosis in the UK. This study showed a high prevalence of EPSM and other myopathies in typical breeds of horses in the UK.     

阿什河上游3种人工林土壤贮水量与入渗特征

 为了解水源地人工林生态系统土壤水分贮存与入渗特征,在阿什河上游光明沟小流域内,选取樟子松、红松、兴安落叶松3种人工林,采用环刀法对其土壤水分贮存量及入渗特征进行对比研究。结果表明:兴安落叶松人工林土壤密度较低,孔隙度和贮水能力较高,与红松人工林和樟子松人工林之间差异显著(P<0.05);10℃时的稳渗系数K10大小依次为兴安落叶松人工林(4.86mm/min)>红松人工林(0.63 mm/min)>樟子松人工林(0.57mm/min)。综合分析表明,兴安落叶松人工林土壤的涵养水源功能最强,樟子松人工林和红松人工林的较差。