浅议高校校园网的安全问题

从校园网的特点出发,针对当前存在的主要安全威胁以及内部安全威胁的表现形式,分析了校园网中存在的各种安全问题,并提出了以多种技术手段和管理手段加强校园网安全的应对策略。     

关于举办第五届“高校生命科学教学论坛”的第一轮通知

<正>自2006年以来,由教育部高等学校生物科学与工程教学指导委员会和高等教育出版社共同主办的"高校生命科学教学论坛",先后在全国组织举办了4届。论坛分别以"生命科学基础课程教学改革与人才培养"、"宏观生物学与人才培养"、"生物学课程教学内容改革与实践"、"生命科学发展与教学改革"     

中国教育学会生物学教学专业委员会召开第六次全国代表大会

由高等教育出版社发起，全国高等学校教学研究中心、全国高等学校教学研究会、教育部高等学校生物科学与工程教学指导委员会及有关高校共同举办的第二届高校生命科学基础课程报告论坛于2007年11月24日至25日在南开大学隆重召开，来自全国150余所高校的近400名代表参加了本届论坛。     

第12届全国高等师范院校生物学课程与教学论专业学术论坛在海南举办

正11月19日第12届全国高等师范院校生物学课程与教学论专业学术论坛在海南师范大学举办。来自全国高校从事生物学教育教学的专家学者及研究人员340余人参加了论坛。论坛上,中国教育学会生物学教学专业委员会副理事长、北京师范大学刘恩山教授,做了主题为"从高中课程标准修订工作看生物学教学改革"的报告,详细阐述了高中生物学课程改革的     

构建医学形态学网络教学平台，全面提升实验教学质量

计算机网络无论从技术层面还是应用层面在我国大多数高等院校都日趋成熟。学生可以利用校园网随时随地可方便地获取网络资源，教师已经实现了网络办公，这一切使得网络教学成为现实。本文将从技术层面和应用层面阐述医学形态学实验课教学平台的建设和应用。本实验室采用典型的百兆位以太网星型拓扑结构，采用先进的网络技术，在同一网络平台上同时传输数据、语音和图像。     

关于滨州医学院开展研究生学术论坛活动的效果评价研究

随着科学技术的发展,研究生教育在教学工作中的地位日渐突出。为了提高研究生培养质量,充分发挥研究生主观能动性,达到促进交流、活跃学术、培养研究生创新能力的目的,开展丰富多彩的研究生学术论坛活动势在必行。本研究通过问卷调查的方式对我校研究生学术论坛开展现状进行了分析,从结果可以看出大部分研究生对待研究生论坛的态度是积极的,同时,大多数研究生对研究生论坛的期望值是很高的,但是,仍有少部分研究生对待研究生论坛存在消极态度,我们应该清醒的认识到目前研究生论坛存在的不足,及时调整研究生学术论坛活动内容和形式,充分调动每一位研究生的积极性和创造性。     

"基因、变异和人类生活"网上教学的实践及体会

随着创新教育改革的发展 ,研究性学习的兴起 ,互联网学习资源的迅速膨胀 ,以学为中心的教学模式被广泛认同 ,教师应从课件的制作和应用为中心转向信息化教学设计为中心 ,在教学中充分注意利用网络资源和各类信息资源来帮助学生自主学习。现代教育技术在学校应用逐步成为日常教学活动的基础。目前我校已建成功能完善的校园网 ,网络教学已成为课堂教学的发展趋势 ,为此 ,我校生物科组首先成立了网络教学课题组 ,进行了一系列的网络教学实践尝试和探讨 ,取得了良好的教学效果和网络教学经验。下面以“基因、变异和人类生活”的活动课为例 ,介绍…     

第9届全国高等师范院校生物学课程与教学论专业学术论坛结束

9月20—23日,第9届全国高等师范院校生物学课程与教学论专业学术论坛于山西师范大学顺利召开。全国30余所高等师范院校生物学课程与教学论专业的近200名专家、学者、研究生和中学教学名师代表参加了会议。本次论坛由中国教育学会生物学教学专业委员会主办,山西师范大学教师教育研究中心、山西师范大学教师教育学院、山西师范大学生命科学学院、山西师范大学科技处共同承办。     

第七届“高校生命科学教学论坛”成功举办

2012年10月19日-21日,第七届“高校生命科学教学论坛”在浙江杭州隆重召开,来自全国200余所高校的540多名代表参会。中国科学院院士、国家级教学名师、国家精品课程主持人、高校生命科学学院院长、知名教授和一线教师共聚一堂,就高校生命科学教学领域的热点问题进行交流和研讨。     

寻找未来科学之星 闪耀中国科学未来

2009年11月20-22日,由教育部离等学校生物科学与工程教学指导委员会和高等教育出版社共同主办的第四届“高校生命科学教学论坛”在广西桂林召开。     

基于网络环境下植物学实验课程的设计与构建

植物学实验网络课程是植物学实验教与学的网络平台。探讨网络环境下植物学实验课程体系的结构和网络教学系统组成,通过建立植物学实验网络辅助教学系统并予以应用,优化整合资源,探索提高植物学实验教学质量的途径。     

Species-specific effects of bombesin on gastric emptying and neurohypophyseal secretion

Previous reports have demonstrated that systemic injection of cholecystokinin (CCK) in rats produces dose-related decreases in food intake, increases in neurohypophyseal secretion of oxytocin (OT), and decreases in gastric emptying. The present studies determined whether systemic injection of bombesin (BBS), another peptide that potently reduces food intake in rats, had similar effects on OT secretion and gastric emptying. Although BBS produces a dose-dependent inhibition of food intake, even very high doses did not significantly affect plasma OT levels and only slightly decreased rates of gastric emptying. Consequently, despite their similar inhibitory effects on food intake, BBS does not appear to activate the same network of central nervous system pathways as does CCK in rats. However, parallel studies in monkeys demonstrated that systemic injection of BBS was effective in stimulating neurohypophyseal secretion of vasopressin rather than OT, in a pattern both qualitatively and quantitatively analogous to the effects of CCK in this species. Together with previous findings that BBS more potently inhibits gastric emptying in primates than in rats, these results therefore also suggest the presence of significant species differences in the central mechanisms by which BBS acts to reduce food intake.     

Empirical Analysis and Modeling of Users' Topic Interests in Online Forums

Bulletin Board Systems (BBSs) have demonstrated their usefulness in spreading information. In BBS forums, a few posts that address currently popular social topics attract a lot of attention, and different users are interested in many different discussion topics. We investigate topic cluster features and user interests of an actual BBS forum, analyzing user posting and replying behavior. According to the growing process of BBS, we suggest a network model in which each agent only replies to the posts that belong to its specific topics of interest. A post that is replied to will be immediately assigned the highest priority on the post list. Simulation results show that characteristics of our model are similar to those of the real BBS. The model with heterogeneous user interests promotes the occurrence of popular posts, and the user relationship network possesses a large clustering coefficient. Bursts and long waiting time exist in user replying behavior, leading to non-Poisson user activity pattern. In addition, the model produces an analogous evolving trend of Gini coefficients for posts'' and clusters'' participants as BBS forums.     

Cholecystokinin and bombesin act independently to decrease food intake in the rat

The satiating effects of cholecystokinin-octapeptide (CCK-8) and bombesin (BBS) when injected alone and in combination were compared in intact rats. When injected alone, both CCK-8 and BBS elicited a dose-related decrease of 30-minute food intake. Injections of BBS were less potent than the equivalent doses of CCK-8 in producing satiety. BBS reached an asymptotic level of suppression of approximately 40 percent at a dose of 2 micrograms/kg, whereas injections of 4 micrograms/kg of CCK-8 resulted in a 72 percent suppression of food intake. When the two peptides were administered in a single injection, the resulting suppression of food intake was equivalent to that which would be predicted if their effects were completely additive. These results support the hypothesis that CCK-8 and BBS act via independent mechanisms to induce satiety. A preliminary model of peptidergic satiety, based on this hypothesis, is proposed.     

Sub-sampling data from the North American Breeding Bird Survey for application to the Bird Community Index,an indicator of ecological condition

We examined the use of data from the North American Breeding Bird Survey (BBS) for assessments of ecological condition using an avian community-based indicator, the Bird Community Index (BCI). In previous research, the BCI was developed and applied to a random sample of sites in the Mid-Atlantic Highlands. The goal of providing national scale assessments with bird community indicators hinges on a demonstration that existing monitoring programs, like the BBS, can be tapped as source data for the indicators. Our goal was to compare a BBS-based assessment of the Mid-Atlantic Highlands to our original assessment based on random sampling locations. We subsampled three iterations of BBS route data from the study area to account for spatial and temporal scale differences between 40 km BBS routes and the original 1 km transects sampled to develop the BCI. All three iterations of BBS subsamples provided lower overall assessments of ecological condition for the Mid-Atlantic Highlands relative to our original research. Land cover analysis, however, revealed that BBS routes sampled land cover types in proportion to their actual prevalence in the region. Thus, we conclude that BBS data are appropriate as source data for broad scale ecological assessments with indicators such as the BCI. For numerous analytical and logistical reasons, we recommend 10-stop subsamples of BBS data as the preferred scale at which to apply bird community indicators of ecological condition.     

The gene for the ataxia-telangiectasia variant,Nijmegen breakage syndrome,maps to a 1-cM interval on chromosome 8q21.

Nijmegen breakage syndrome (NBS; Seemanová II syndrome) and Berlin breakage syndrome (BBS), also known as ataxia-telangiectasia variants, are two clinically indistinguishable autosomal recessive familial cancer syndromes that share with ataxia-telangiectasia similar cellular, immunological, and chromosomal but not clinical findings. Classification in NBS and BBS was based on complementation of their hypersensitivity to ionizing radiation in cell-fusion experiments. Recent investigations have questioned the former classification into two different disease entities, suggesting that NBS/BBS is caused by mutations in a single radiosensitivity gene. We now have performed a whole-genome screen in 14 NBS/BBS families and have localized the gene for NBS/BBS to a 1-cM interval on chromosome 8q21, between markers D8S271 and D8S270, with a peak LOD score of 6.86 at D8S1811. This marker also shows strong allelic association to both Slavic NBS and German BBS patients, suggesting the existence of one major mutation of Slavic origin. Since the same allele is seen in both former complementation groups, genetic homogeneity of NBS/BBS can be considered as proved.     

Surveys reveal a complex association of phytoplasmas and viruses with the blueberry stunt disease on Canadian blueberry farms

Surveys for phytoplasmas and viruses were conducted during September 2014 and 2015 on highbush blueberry farms in the Région Montérégie, Quebec. Total DNA and RNA were extracted from blueberry bushes showing blueberry stunt (BBS) symptoms and from symptomless blueberry bushes, and utilised as templates for PCR and RT‐PCR assays, respectively. Phytoplasma DNA was amplified with universal phytoplasma primers that target the 16S rRNA, secA and secY genes from 12 out of 40 (30%) plants tested. Based on 16S rRNA, secA and secY gene sequence identity, phylogenetic clustering, actual and in silico RFLP analyses, phytoplasma strains associated with BBS disease in Quebec were identified as ‘Candidatus Phytoplasma asteris’‐related strains, closely related to the BBS Michigan phytoplasma strain (16SrI‐E). The secY gene sequence‐based single nucleotide polymorphism analysis revealed that one of the BBS phytoplasma strains associated with a leaf marginal yellowing is a secY‐I RFLP variant of the subgroup 16SrI‐E. Two viruses were detected in blueberry bushes. The Blueberry Red Ringspot Virus (BRRV) was found in a single infection in the cultivar Bluecrop with no apparent typical BRRV symptoms. The Tobacco Ringspot Virus (TRSV) was found singly infecting blueberry plants and co‐infecting a BBS phytoplasma‐infected blueberry cv. Bluecrop plant. This is the first report of TRSV in the cv. Bluecrop in Quebec. The Quebec BBS phytoplasma strain was identified in the leafhopper Graphocephala fennahi, which suggests that G. fennahi may be a potential vector for the BBS phytoplasma. The BBS disease shows a complex aetiology and epidemiology; therefore, prompt actions must be developed to support focused BBS integrated management strategies.     

Centrally and peripherally administered bombesin decreases food intake in turkeys

The effects of intracerebroventricular (ICV) and intravenous injections of bombesin (BBS) on food intake were investigated in turkeys. Adult turkey hens were injected ICV with 50 to 1000 ng of BBS. In addition, the effect of pretreatment with the BBS antagonist [d-Arg1, D-Phe5, D-Trp7,9, Leu11]-substance P was investigated. To determine if BBS also had a peripheral site of action, 0.5 to 8 micrograms/kg body weight of BBS was injected IV into turkey poults. The ICV and IV injections of BBS decreased food and water intake in a dose-dependent manner. The most efficacious doses when injected ICV for decreasing food and water intake were 1000 and 500 ng, respectively, whereas 8 micrograms/kg was most efficacious in decreasing food intake when administered IV. The satiating effect of ICV-injected BBS could be attenuated with pretreatment with the BBS antagonist. The results of these studies suggest that BBS acts to decrease food and water intake in both the periphery and the central nervous systems of turkeys.     

Bombesin elicits satiety in sham feeding rats

The satiety effect of intraperitoneal injections of the synthetic tetradecapeptide bombesin (BBS) was examined in rats equipped with chronic gastric cannulas. BBS produced potent, dose-related suppressions of both sham feeding (on days when gastric cannulas were open) and feeding (on days when gastric cannulas were closed). BBS not only suppressed sham feeding, but also elicited the behavioral sequence characteristic of normal satiety. The results demonstrate the potency of BBS in eliciting behavioral satiety under conditions in which gastric, intestinal and postabsorptive mechanisms are minimally activated by ingested food. These findings are consistent with previous reports suggesting a role for BBS in satiety.