不同裸燕麦品种的淀粉特性

为给燕麦淀粉的应用以及适宜加工品种的筛选提供依据,从国内主栽燕麦中选取10个品种的11个样品(其中坝莜1号有河北和山西产两种样品)作为供试材料,通过湿法提取燕麦淀粉,并对其组成、黏度及凝胶特性进行了对比分析.结果显示,不同裸燕麦品种的总淀粉含量和直链淀粉含量变幅分别为91.06%～95.98%和21.06%～31.26%,品种间总淀粉变异较小,而直链淀粉变异较大.淀粉糊化特征中,样品间淀粉糊化温度变异最小,平均为82.0℃,反映淀粉糊热稳定性的破损值差异最大(变异系数23.8%).在淀粉的凝胶特性指标中,黏附性差异最为显著(变幅0.00～139.89 g·s),其次为硬度(9.87～43.76 g),弹性、黏聚性差别不显著.11个材料中,坝莜1号(河北产)淀粉糊黏度大.热稳定性好;晋八属于易回生、强凝胶型.     

闽楠扦插繁殖技术研究

研究了闽楠扦插育苗中不同穗条母树年龄、不同扦插基质、生根剂、不同扦插时间对生根率的影响,结果表明：采条母树龄、扦插基质和扦插时间对扦插生根率影响较大;1a生穗条扦插生根率远大于3a生及5a生穗条苗;不同扦插基质对插穗生根的作用效果差异显著;砻糠灰通透性强,生根最快,成活率最高,且在后期生长上均有较佳表现;2～3月份的扦插生根率为最高。     

鸡传染性法氏囊病病毒SYBR Green Ⅰ实时荧光定量RT-PCR检测方法的建立

R-PCR扩增IBDV的VP5基因保守片段,将其克隆到pMD18-T载体,经测序鉴定得到阳性质粒.以阳性质粒为标准品,建立SYBR Green Ⅰ实时荧光定量RT-PCR的标准曲线和溶解曲线.结果表明,IBDV荧光定量PCR的标准曲线Ct值与3.29×10～3.29×108之间的病毒基因拷贝数呈现良好的线性关系.该方法...     

福建省蛋鸡血管瘤型J亚群白血病的分子生物学诊断

针对福建省某鸡场的蛋鸡群发生产蛋下降和部分死亡,病鸡脚趾明显呈现血管瘤特征,运用实时荧光定量PCR方法对病鸡组织和血液样品进行检测,检出了J亚群白血病病毒(ALV-J);通过基因序列的比较分析,发现其氨基酸序列与国外及国内其他省份报导的ALV-J有很高的同源性,从病原分子生物学诊断角度证实福建省蛋鸡群中ALV-J的存在。     

大叶白蜡幼苗生长对不同光强遮荫处理的响应

在不同光照梯度(55.44%自然全光照(natural sunlight,NS)、21.12%NS、3.47%NS和0.86%NS)的人工遮荫条件下,研究了大叶白蜡(Fraxinus rhynchophylla)幼苗的生长特点。结果表明,幼苗株高、基径、主根长、单株叶面积、总干重、相对生长率和净同化率等生长参数均在55.44%NS最大,分别为70.0 cm、6.84 mm、31.95 cm、798.80 cm2、10.28 g、31.13×10-3g.d-1和3.25×10-5g.cm-2.d-1,而且随光照的减弱而减小。幼苗比叶面积随着光照强度的减弱先增大后减小,在3.47%NS处理最大(597.43 cm2.g-1)。     

Generating and reducing video summary with adaptive CCV and equivalent relation clustering

It is very essential to extract representative frames in the process of generating video summary. A method is proposed which analyses the color features of the video frames, sets the connectivity threshold values automatically according to the contents, extracts the color coherence vectors (CCV) and then performs adaptive clustering based on equivalent relation. After global partition, local partition was revised with time sequential features. The whole process does not need to set any threshold values. The experiments with diverse videos yields effective results.     

利用谷氨酰胺转氨酶和结冷胶提高鱼丸凝胶强度的研究

用磷酸盐提高鱼丸凝胶强度的效果显著,但根据GB2760规定,用量有限。采用谷氨酰胺转氨酶(TG酶)和结冷胶替代磷酸盐,优化配方为:谷氨酰胺转氨酶添加量为0.4%,结冷胶添加量为0.5%,产品的凝胶强度达到使用磷酸盐的1.9倍。     

高职食品安全与检验技术类学习领域课程构建的研究

"食品质量安全控制与管理"和"食品检测技术"是高职高专院校食品安全与检验技术专业的两个重要学习领域与食品检验和食品生产现场质量安全控制岗位相对接是食品类专业教学改革的关键与难点。在教育部高职高专食品类教学指导委员会的指导下,构建了"食品质量安全控制与管理"和"食品检测技术"两门课程的设置,为规范高职高专院校食品安全与检验技术类专业提供了支撑。     

马铃薯生料发酵制备乙醇的研究

比较了商品复合酶和生淀粉酶对马铃薯生料直接发酵转化乙醇的影响,60Co-γ射线辐照处理马铃薯对乙醇发酵的影响。结果表明,以生淀粉酶为糖化剂的发酵液中乙醇体积分数远远高于商品复合酶的乙醇体积分数,辐照处理可显著提高马铃薯生料转化乙醇的能力。     

Reduction of herbivore density as a tool for reduction of herbivore browsing on palatable tree species

Browsing of overabundant free-living herbivores often limits the natural as well as artificial regeneration of forest in Central-European Mountains. The aim of the study was to assess the efficiency of the extensive reductions of herbivore populations for protection of forest regeneration in preferred areas. We analysed the relationship between the intensity of shoot browsing and relative density of herbivores in viewpoint of natural regeneration of secondary mountain spruce stands with low proportion of broadleaved trees in Králicky Sněžník Reserve (Czech Republic). The distribution of seasonally migrating herbivores was established by counting faecal pellet groups (standing crop method) in growing season. The intensity of browsing of spruce, beech and rowan was assessed using the proportion of browsed shoots on individual tree sapling. Density of red deer was re-counted from the number of pellet groups and it was 15–56 individual/km². The intensity of spruce browsing was low in the whole area in all seasons. In general, the intensity of rowan and beech shoot browsing was high in the whole area. There were no correlations between deer density and browsing intensity of rowan (browsing was severe in all plots). We conclude that the natural regeneration of attractive trees and shrubs is nearly impossible in habitats where proportion of these food items is too small, even when the density of herbivores is low. Reduction of herbivores density is useful for protecting spruce and other tree species with low preference by herbivores. Forest managers should take into account the high palatability of deciduous tree species and distribution of herbivores on localities. Preference of localities is often based on grasses in the food supply. Regeneration of highly palatable tree species requires both low density of herbivores and sufficient protection of saplings.