生长条件对根霉菌生长状态的影响研究

菌株能在发酵基物上生长良好是发酵食品选择菌株的第一道关卡。以几株形态差异较大的根霉菌为研究对象,在不同碳源、温度、 pH值、光照等条件下培养,观测其生长速度和形态特征,讨论菌株在发酵食品中应用的适应性,为发酵食品的菌株选育和条件控制等奠定基础。结果表明,碳源、温度、 pH值对各菌株均有一定的影响,而光照只对个别菌株有有限的影响。从生长速度来看, R2, R3, R5菌株的最快生长速度明显快于R6;从菌株形态看, R5, R6菌株优于R2, R3菌株。     

杂交水稻的发展现状及展望

本文主要介绍了杂交水稻的发展,以及其在中国和世界所带来的巨大影响,其在国内外的发展现状和对策以及发展前景。     

Slab Defect Diagnosis and Predicting System Based on Rough Set Theory

In accordance with the special characteristics of state medium-sized construction enterprises and their reform objects of "having a free hand and enlivening", the suitable objective model, the stock cooperative system for state medium-sized construction enterprises has been put forward in this paper by analyzing the system mechanism of stock cooperative system enterprises. Then the causes for it were expounded.     

Modeling and simulation of the upper limb artery system using three section electric network model

A three section electric network model is built for human upper limb arterial system according to the Windkessel model. Blood pressure waveform of brachial artery is inputted into the electric network model. The state space equations of the electric network model are refined by using the state space analysis and solved numerically by the fourth order Runge Kutta method to obtain the blood pressure and flow waveform of radial artery. Effects of changes of the electric network model’s parameters on the blood pressure and flow waveform are also analyzed in normal and different pathological conditions(arteriosc lerosis and hypertension). The results of simulation show that the parameters of the model can well reflect the physiological significations of the upper limb arterial system; the analytic and computational methods are of fairly high precision and fast convergence for the model; and the model can simulate effectively the hemodynamic characteristics of upper limb arteries under normal and different pathological conditions.     

玉米苗枯病的发生及药剂处理种子对该病控制作用的研究

自1998～2002年对鲁西北玉米主产区苗枯病进行了调查研究,田间调查表明玉米苗枯病的发生与土壤类型、苗期降雨量、品种抗性及种子带菌率等多种因素有关.病原鉴定结果得知玉米苗枯病是由串珠镰刀菌(Fusarium moniliforme)、禾谷镰刀菌(Egraminearum)、玉米丝核菌(Rhizoctonia zeae)等多种真菌引起.药剂拌种可明显减轻病害发生,用种子量0.15%的适乐时、卫福、多菌灵拌种防治效果分别为95.63%、92.82%、84.31%,尤其使用适乐和卫福处理玉米种子,田间出苗率高、苗健壮、叶色浓绿,值得推广使用.     

好食脉孢菌和红酵母协同发酵秸秆产类胡萝卜素的研究

以好食脉孢菌和红酵母为发酵菌种,通过固态发酵玉米秸秆生产类胡萝卜素。将类胡萝卜素产量作为发酵指标,通过对培养基含水量、培养基初始pH值、氮源添加量、碳源添加量、无机盐添加量、培养基装量的单因素试验和正交试验确定最优培养基条件:秸秆用量10 g,干豆渣(氮源)用量3 g,麸皮(碳源)用量4 g,MgSO4添加量0.4%(与秸秆量比W/W),pH值约为5.5,培养基含水量为60%,培养基装量为12.5 g/250 mL,最佳发酵条件为接种量20%(好食脉孢菌∶红酵母=1∶1),培养温度28℃,培养时间96 h。通过优化后的类胡萝卜素产量为224.75μg/g。     

芡实加工及有效成分提取研究进展

芡实为一年生水生草本植物,是一种具有食用和药用价值的经济作物.本文从芡实营养成分及药用价值、产后加工与保鲜技术、相关食品开发、有效成分的提取和副产物利用等方面进行了综述,并对芡实未来的加工和利用进行了展望,以期为芡实加工产业的发展提供新思路.     

藕带加工研究进展与展望

对藕带进行了介绍,阐述其研究加工现状,并对其未来研究及加工提出了展望与建议。     

Effects of management on coarse woody debris volume and composition in boreal forests in northern Sweden

Forest management practices have led to a reduction in the volume and a change in the composition of coarse woody debris (CWD) in many forest types. This study compared CWD volume and composition in reserves and two types of managed forest in the central boreal zone of Sweden. Ten areas were surveyed, each containing clear-cut, mature managed and old-growth stands, to determine the volume of standing and lying CWD in terms of species composition, decay class and size class. Volumes of CWD on clear-cuts and in mature managed forests were high compared with previous studies. Old-growth forests (72.6 m³ ha^?1) contained a greater volume of CWD than mature managed forests (23.3 m³ ha^?1) and clear-cuts (13.6 m³ ha^?1). Differences were greatest for the larger size classes and intermediate decay stages. Despite stand ages being up to 144 years, CWD volume and composition in managed forests was more similar to clear-cuts than to old-growth forests.     

莆田市城市行道树存在的问题与对策

指出了行道树作为城市园林绿化的重要组成部分,是反映城市绿化综合管理水平的一个重要指标,在城市园林绿化中发挥着举足轻重的作用。对莆田市行道树现状进行了研究分析,针对莆田市行道树当前存在的问题提出了相关改进措施,以改善行道树生存状况,促进行道树健康发展,发挥行道树最大的生态和环境效益。