番茄灰霉病菌生物学性状研究

试验表明:番茄灰霉病菌菌丝在5-30℃均能生长,孢子在5-30℃均可萌发,菌丝生长和孢子萌发最适温度为22℃,菌丝生长和孢子萌发喜偏酸的环境,最适pH值分别为5和6,孢子萌发需较高的湿度(RH≥81%),在不同的培养基里菌丝生长以PDA最佳,对碳源的利用以果糖最佳,对氮源的利用以门冬酰胺最佳,葡萄糖对产孢最有利,谷氨酸、葡萄糖、果糖显著促进孢子萌发,淀粉、蔗糖、精氨酸显著抑制孢子葫发,病菌侵染果实最佳温度为16℃,孢子浓度在1×102-1×106个/ml范围内都能侵染番茄果实发病,浓度在1×105个/ml以上病斑发展速度明显加快.     

连接论对任务型英语教学的支持

连接论认为外语学习的过程就是逐渐改变网络联系权重的过程。任务型教学是外语教学中一种倡导学生自主性的教学方法。连接论的观点对任务型外语教学有重要启示。文章通过分析连接论对任务型英语教学的支持,尝试说明连接论作为任务型英语教学生物性基础理论的必要性。     

生物反应器产业概况

生物产业的不断发展,带动生物反应器产业的技术革新和产品的推陈出新,从而在生物经济时代抢占经济的制高点,促进国民经济持续稳定的发展。本文介绍了生物反应器的概念,国际、国内的生产现状,我国该行业存在的问题及对策。     

林克霉素发酵中生物氮素的替代应用

使用生物氮素替代林可霉素发酵培养基中黄豆饼粉。摇瓶结果显示,不同的替代比例对林可霉素发酵的影响大不相同。合适的替代比例可以改善发酵中后期的菌丝形态,大幅提高发酵水平。在50L发酵罐,使用生物氮素替代40％的黄豆饼粉,可以提高发酵效价9．79％。生物氮素质量稳定,且有一定的相对价格优势,在林可霉素发酵生产上有着不错的应用前景。     

虹膜图像质量评价方法研究

虹膜识别中,图像质量除受到采集设备、环境光照、目标位置、目标状态等因素影响外,错误的图像分割也会导致图像质量下降,因此单一量度或较少量度都不能准确评价用于匹配计算的虹膜图像质量.基于此设计了可用虹膜区、虹膜大小、清晰度、扩张度等八个评价因子;研究了各评价因子所表征的图像质量特性;提出了利用图像分割参数计算各评价因子的方法;根据实验得到的各评价因子阈值以及图像分割可能的错误,对质量评价因子进行校准;最后融合校准后的因子形成虹膜图像质量评价值.实验结果显示所提出的方法可有效评价虹膜图像质量.     

Philosophy of Science in the Science Teacher Education Curriculum

Summaries

English

The purpose of this article is to promote awareness of a growing body of literature concerned with the relationship between the epistemology of science and school science education, and to stimulate debate concerning the role such epistemological considerations should play in the professional training of science teachers. First of all, a rationale is provided for the inclusion of the epistemology of science and its relationship to school science education as an essential component on the professional training of all science teachers. This is followed by a review of existing resources for use in science teacher education curricula, and suggestions for new resource material. Finally, a possible curriculum for inclusion in science teacher education programmes is presented.     

DNA生物大分子的动力学特性与生物功能(Ⅰ)

本文全面考虑了ＤＮＡ的碱基对的相互作用、双链的整体振动效应和链内分子的集体激发等运动状态，应用在我们最近在蛋白质分子中建立的新理论与其它方法，研究了ＤＮＡ分子的动力学特性，集体激发与孤立子运动．并应用此结果深入研究ＤＮＡ的一些生物功能，如复制、转录等问题．     

生物磁学与生活

生物磁学是一门正在迅速发展的科学技术,它与人体及其他生物体有着密切关系,生物磁场和磁性可反映生物体内的生理和病理的信息,而外磁场对人体及生物体的生长,发育和代谢等生命活动也会产生影响.     

不同白灵菇菌株的亲缘关系及培养特性研究

通过对外引进10个白灵菇菌株进行拮抗试验、生长速度测定、生长势观察和出菇试验,初步鉴定了它们的亲缘关系,比较了它们的生长特性。结果表明,白灵菇菌株间存在同种异名现象。Pn 1、Pn2和Pn11为性状优良的菌株。     

Hyperhydration using different hydration agents does not affect the haematological markers of the athlete biological passport in euhydrated volunteers

ABSTRACT

Athlete Biological Passport (ABP) is an indirect approach, implemented by WADA, aimed at detecting blood manipulation based on abnormal changes in haematological markers. Cases report the use of hyperhydration as masking method during anti-doping urine sample collection which could potentially mask suspicious fluctuations on ABP profiles. This study investigated the hyperhydration effect on haemoglobin concentration, reticulocyte percentage and OFF-hr score (an algorithm based on haemoglobin concentration and reticulocyte percentage), with and without recombinant human erythropoietin (rHuEPO) administration. A five-week clinical study performed; Baseline and rHuEPO Phase. Water and a sports drink were used as hyperhydration agents. To examine the hyperhydration effect on the normal ABP profile per volunteer, hyperhydration was implemented at 0, 24 and 48 hours during the baseline. During the rHuEPO phase, volunteers received Epoetin beta (3000 IU) with hyperhydration to be implemented at 0, 24 and 48 hours after drug administration. Blood and urine samples were collected and analysed according to WADA guidelines. No significant effect on ABP markers was observed due to hyperhydration at any time during the study. Pre- and post-hyperhydration data were not statistically different compared to individual baseline data. In conclusion, hyperhydration does not affect the ABP haematological markers under the examined conditions.