一种新的提高树苗盐容量的移植方法

The influence of quinclorac (3,7-dichloroquinoline-8-carboxylic acid) on enzyme activities in flooded paddy soils was assessed under laboratory conditions. The enzymes differed markedly in their response to quinclorac. Quinclorac inhibited proteinase, hydrogen peroxidase, phosphorylase, and urease activities. The higher the concentration of quinclorac applied, the more significant the inhibition to these observed activities with a longer time required to recover to the level of the control. However, soils supplemented with quinclorac were nonpersistent for proteinase~ phosphorylase and urease as opposed to soils without quinclorac. Dehydrogenase activity was also sensitive to quinclorac. Three soil samples with concentrations of quinclorac higher than 1 μg g^-1 soil declined to less than 20% of that in the control. However, the highest dehydrogenase activity (up to 3.28-fold) was detected in soils with 2 μg g^-1 soil quinclorac on the 25th day after treatment. Quinclorac had a relatively mild effect on saccharase activity at the concentrations used in this experiment and a stimulatory one on soil respiration when added to soil at normal field concentrations. Nonetheless it was inhibited at higher concentrations in paddy soils. Quinclorac is still relatively safe to the soil ecosystem when applied at a normal concentration (0.67 μg g^-1 dried soil) but may have some effects on soil enzymes at higher concentrations.     

崇仁麻鸡种鸡日粮中添加黄粉虫的效果观察

黄粉虫是人工养殖最理想的动物性蛋白质饲料之一。黄粉虫的幼虫含蛋白质51％，蛹含蛋白质57％。成虫含蛋白质60％，还富含多种糖类、氨基酸、维生素、激素、活性酶及微量元素。在崇仁麻鸡种鸡日粮中添加新鲜黄粉虫能明显提高种鸡生产性能、种蛋受精率和孵化率。现将试验情况报告如下：     

稀缺的蓝莓、诱人的市场

蓝莓又名越橘．是一种小浆果,果实呈悦目的蓝色．被一层白色果粉包裹．果肉细腻,种子极小。蓝莓果实中除了含有常规水果中含有的各种糖分、果酸类和维生素C外．还富含多种维生素和抗衰老的生物活性酶SOD、熊果苷、花青素、食用纤维以及丰富的钾、铁、锌和钙等。蓝莓不仅可鲜果食用．还可加工成品种繁多的蓝莓制品．如蓝莓饮料、蓝莓酒、蓝莓果汁、蓝莓果酱、蓝莓果干、蓝莓糖、蓝莓胶囊等。     

产纤溶活性酶凝结芽孢杆菌的分离鉴定及其酶活性质初探

从传统发酵食品豆豉中分离到一株纤溶活性酶产生菌株,命名为YC 4,经鉴定为凝结芽孢杆菌(Bacilluscoagulans).纯化菌株接种到发酵培养液中,37℃ 200 rpm振荡发酵72 h,发酵上清酶活达452 IU/mL.酶活性质的初步研究结果表明,该酶对温度相对稳定,37℃保温5 h,酶活性保持80%以上;酶的适宜pH为7～9,最适pH为9;用改良的纤维蛋白平板测定其酶活作用方式表明,该酶既有直接纤溶活性,也有纤溶酶原激活活性.

Abstract：

A fibrinolytic enzyme-producing strain, YC-4, was screened and purified from douchi - a Chinese traditional fermented food, and was identified as Bacillus coagulans. After the strain was cultured in BPY medium at 37 ℃ and 200 rpm for 72 h, the fibrinolytic activity of its supernatant was up to 452 IU/mL.The fibrinolytic enzyme from the supernatant was stable below 37 ℃ and its preferable pH ranged from 7 to 9, with 9 being the optimum. Further research with plate determination indicated that the fibrinolytic enzyme showed not only direct fibrinolytic activity, but also plasminogen activator activity.     

华北土石山区不同肥料对土壤活性酶的影响

肥料施入土壤后,会对酶活性产生一定的影响,进而影响土壤的生态和土壤质量。以河北平山片麻岩及花岗岩山地贫瘠土壤为研究对象,通过施用3种新型肥料后探究土壤各种酶活性在不同肥料之间差异性。结果显示,土壤蔗糖酶、过氧化氢酶、酸性磷酸酶、中性磷酸酶活性均有所提高,脲酶活性降低,其中生物有机肥对脲酶的抑制作用最强,微生物菌肥对脲酶的抑制最弱。     

干旱胁迫对栀子叶绿素荧光参数及生理生化指标的影响

[目的]探究干旱胁迫对栀子叶绿素荧光参数及生理生化指标的影响,为栀子的栽培管理及品种选育提供参考。[方法]以‘灵地珍栀’无性系扦插苗为试材,设置轻度、中度和重度干旱胁迫处理(土壤相对含水量分别为55%～60%、40%～45%和20%～25%),以土壤相对含水量75%～80%为对照(CK),比较干旱胁迫10、20、30 d各处理栀子的叶绿素荧光参数及生理生化指标。[结果]随着干旱胁迫时间的延长,各处理初始荧光产量(F₀)、最大荧光产量(F_m)和过氧化氢酶(CAT)活性均呈先上升后下降趋势,超氧化物歧化酶(SOD)活性则先下降后上升;除CK外,各处理可溶性蛋白含量均呈先上升后下降趋势;轻度与中度干旱胁迫下,最大光化学量子产量(F_v/F_m)、PSⅡ量子效率(F_v/F₀)波动上升,重度胁迫则呈下降趋势;中度与重度干旱胁迫下,丙二醛(MDA)含量持续上升。随着胁迫加剧,不同胁迫时间下F₀、F_m总体上呈下降趋势,MDA含量、...     

蛋壳粉的功能与利用

蛋壳占整个鸡蛋重量的10％-12％，是一种天然的钙源，并且含有一定量的蛋白质，活性酶石灰质的硬壳部分主要由碳酸钙组成，其次是碳酸镁和磷酸钙，其钙、磷含量分别占蛋壳干物质的34．9％和0．2％，易被人和动物所消化吸收。     

添加活性酶试养日本对虾的效果

在饲料及养殖水体中添加活性生长物质,对水产养殖对象有促进生长、增强抗病力的作用。不但能够提高饲料利用率、降低生产成本,同时对于改善水质环境亦有益处;采用商品化的活性饲料营养促进剂,比起其它药物(特别是化学药品)来,可以减少和避免药物残留及引起抗药性。本文以商品添加剂“康力旺—A”(92—川牧饲字第159—001,执行标准Q/00046,1,92),添加入常规“厦清牌”对虾配合饲料中,及单一投入养殖水体中,经过一个半月的试养验证其可行性及实用效果。     

低温处理对西番莲扦插苗生长及生理特性的影响

本试验以芭乐黄金果、紫香1号和台农1号西番莲品种扦插苗为试验材料,研究西番莲在低温条件下其植株生长及其体内保护酶活性变化情况,并通过恢复生长试验,测定植株存活率,进一步探明西番莲耐冷机理。试验结果表明,在低温处理下,各参试材料中丙二醛（MDA）和可溶性糖（SS）含量随温度降低而逐渐增加;超氧化物歧化酶（SOD）活性测得值呈下降趋势、过氧化物酶（POD）活性、过氧化氢酶（CAT）活性和脯氨酸（Pro）含量测得值呈先增加后减少,在温度为10℃时,测得值均达到最大,在温度低于3℃时,测得值均低于对照;恢复生长试验中,3℃处理后的芭乐黄金果西番莲品种存活率为0,0℃处理后的三个参试品种,存活率均为0。综上所述,西番莲扦插苗受到低温伤害时,其叶片中MDA含量增加,诱导出POD、SOD和CAT保护酶活性,同时体内脯氨酸（Pro）和可溶性糖（SS）含量会逐渐积累增加,从而进一步提高植株抗寒性。     

有些水果最好不要在经期吃

黄瓜是四季餐桌上的“平民”蔬菜，以其营养、价廉大受青睐。黄瓜含有胶质、果酸和生物活性酶，可促进机体代谢，能治疗晒伤、雀斑和皮肤过敏。黄瓜还能清热利尿、预防便秘。新鲜黄瓜中含有的丙醇二酸，能有效地抑制糖类物质转化为脂肪，因此，常吃黄瓜对减肥和预防冠心病很有益处。