以问题为导向的互动式教学法在普外科临床教学中的应用

目的:研究以问题为导向的互动式教学法在普外科临床教学中的应用。方法:选取2010级应用以问题为导向的互动式教学法的普外科学生120名(研究组),另选取2009级之前的传统教学法普外科学生120名(对照组),分析两组的成绩,对学生进行问卷调查,了解学生对两种教学的评价。结果:研究组平均分为(79.8±2.3)分,高于对照组的(77.6±2.1)分,两组比较差异无统计学意义(P0.05);研究组分数≥80分者显著多于对照组,两组比较差异具有统计学意义(P0.05);研究组学生对授课的满意度显著高于对照组,两组比较差异具有统计学意义(P0.05)。结论:以问题为导向的互动式教学法应用于普外科临床教学中具有较好的效果,能提高学生的分数,提高学生的满意度。     

Noncanonical Gβ Gib2 Is a Scaffolding Protein Promoting cAMP Signaling through Functions of Ras1 and Cac1 Proteins in Cryptococcus neoformans

Gβ-like/RACK1 functions as a key mediator of various pathways and contributes to numerous cellular functions in eukaryotic organisms. In the pathogenic fungus Cryptococcus neoformans, noncanonical Gβ Gib2 promotes cAMP signaling in cells lacking normal Gpa1 function while displaying versatility in interactions with Gα Gpa1, protein kinase Pkc1, and endocytic intersectin Cin1. To elucidate the Gib2 functional mechanism(s), we demonstrate that Gib2 is required for normal growth and virulence. We show that Gib2 directly binds to Gpa1 and Gγ Gpg1/Gpg2 and that it interacts with phosphodiesterase Pde2 and monomeric GTPase Ras1. Pde2 remains functionally dispensable, but Ras1 is found to associate with adenylyl cyclase Cac1 through the conserved Ras association domain. In addition, the ras1 mutant exhibits normal capsule formation, whereas the ras1 gpa1 mutant displays enhanced capsule formation, and the ras1 gpa1 cac1 mutant is acapsular. Collectively, these findings suggest that Gib2 promotes cAMP levels by relieving an inhibitory function of Ras1 on Cac1 in the absence of Gpa1. In addition, using GST affinity purification combined with mass spectrometry, we identified 47 additional proteins that interact with Gib2. These proteins have putative functions ranging from signal transduction, energy generation, metabolism, and stress response to ribosomal function. After establishing and validating a protein-protein interactive network, we believe Gib2 to be a key adaptor/scaffolding protein that drives the formation of various protein complexes required for growth and virulence. Our study reveals Gib2 as an essential component in deciphering the complexity of regulatory networks that control growth and virulence in C. neoformans.     

Signal value of alternating and overlapping singing in the Yellowhammer<Emphasis Type="Italic"> Emberiza citrinella</Emphasis>

Interactive playback experiments were used to study the signal value of alternating and overlapping singing in the Yellowhammer Emberiza citrinella. We carried out interactive playback experiments in which 13 males were subjects of two treatments that differed in temporal pattern of playback song delivery (alternating vs overlapping). We measured 12 parameters of males' response, belonging to three categories: song output, call output and mobility (distance from loudspeaker and flights). The results do not confirm the hypothesis that the overlapping pattern is a signal of stronger threat, as compared to the alternating pattern. Overlapping and alternating playbacks generally elicited a similar response, characteristic for highly aroused males. The only significant difference found concerned latency of approach to the loudspeaker during the playback stage. When playback alternated with songs of males, the birds gained higher scores on the axis of that response measure. Such a result was linked to differences in how the alternating and overlapping playbacks affect detection and localisation of simulated rivals, rather than to the signal's threat value itself. The strong response of Yellowhammer males is consistent with the high intrusion rate and possibility of extra-pair copulation in this species, which probably simplifies close-range communication towards more aggressive and unequivocal repelling of rivals irrespective of the temporal patterning of song.     

Examination of multiple disturbances effects on herbaceous vegetation communities in the Sudanian savanna-woodland of West Africa

In West Africa, policies for prescribed early fire, grazing and selective tree cutting in the savanna-woodlands are rarely based on long-term experimental studies. The purpose of this study was to provide scientific evidence based on field data from two case studies for an informed discussion on the long-term response of herbaceous abundance both at the community and individual species levels to fire, grazing, selective cutting and their interactions. A long-term factorial experiment was established in two State forest reserves in Burkina Faso that mainly differ in their soil attributes. Community abundance data recorded from line intercept sampling over 13 years were analyzed using a multivariate ordination technique known as principal response curves (PRC).     

Uncertainty and Variability in Product Carbon Footprinting

Recent years have seen increasing interest in life cycle greenhouse gas emissions accounting, also known as carbon footprinting, due to drivers such as transportation fuels policy and climate‐related eco‐labels, sometimes called carbon labels. However, it remains unclear whether applications of greenhouse gas accounting, such as carbon labels, are supportable given the level of precision that is possible with current methodology and data. The goal of this work is to further the understanding of quantitative uncertainty assessment in carbon footprinting through a case study of a rackmount electronic server. Production phase uncertainty was found to be moderate (±15%), though with a high likelihood of being significantly underestimated given the limitations in available data for assessing uncertainty associated with temporal variability and technological specificity. Individual components or subassemblies showed varying levels of uncertainty due to differences in parameter uncertainty (i.e., agreement between data sets) and variability between production or use regions. The use phase displayed a considerably higher uncertainty (±50%) than production due to uncertainty in the useful lifetime of the server, variability in electricity mixes in different market regions, and use profile uncertainty. Overall model uncertainty was found to be ±35% for the whole life cycle, a substantial amount given that the method is already being used to set policy and make comparative environmental product declarations. Future work should continue to combine the increasing volume of available data to ensure consistency and maximize the credibility of the methods of life cycle assessment (LCA) and carbon footprinting. However, for some energy‐using products it may make more sense to increase focus on energy efficiency and use phase emissions reductions rather than attempting to quantify and reduce the uncertainty of the relatively small production phase.     

Cyberkids in Metropolitan America

Children have learning and problem-solving powers at least equal to those of adults. But children are in general disempowered and treated as inferior to adults. The availability of home computers from around 1980, and of internet and e-mail facilities from around 1990, created a window of freedom for those children who were allowed unmonitored access to computers, e-mail and the internet. Children who learned computer skills while they were still children became more proficient at these skills than adults who only began to acquire the same skills as adults. For a period of time, scientists well advanced in such fields as physics and aeronautics had to rely upon adolescents to fill their programming needs. In addition, during the early days of home-computing, around 1980, computer-territory was still relatively rough and virgin. The internet was unknown, computer games were unknown, and anyone who entered computer territory had to learn programming in order to derive any benefits from this territory. By the late 1990's, commercial interests had gained a strong foothold in computer territory, and any child or adult with zero skills could enter this territory as a consumer and derive information and entertainment from this territory, without acquiring the kinds of skills necessary to exercise any degree of control over the computer-based landscape. Still, computer science remains a new frontier, in that any person who has the skills to act on this frontier may achieve success, regardless of that person's age, social status, et cetera. The two greatest barriers to success are limitations on access to computers and the internet, and English-language knowledge. The latter barrier is falling. Inasmuch as ability to navigate and alter the landscape of computer territory is a source of great power, and inasmuch as children acquire such skills more quickly than adults, may we consider a new empowerment of children to be in the offing? Or will adults co-opt the instruments of power, and will children remain as pets and slaves of adults for the indefinite future?     

褐飞虱与白背飞虱共栖时的互作效应

用笼罩试验方法,研究了褐飞虱和白背飞虱共栖时的互作效应．结果表明,在９６ ｈ内,随时间的延长,２种飞虱对不同稻株的栖息率渐趋增加,最终达２１．５～２５．０％,不表 现种间差异;脉冲试验使白背飞虱的雌性率和短翅率提高 ２２． １％和 ３９８． １％;排除试验使 白背飞虱的增殖、雌性率和雌虫短翅率各下降 ８． ８％、２０． ８％和 ４８． ０％;种间作用对增殖。 性比和翅型产生正的或负的效应．文中还讨论了种间作用存在的意义和方式．     

Interactive learning and action: realizing the promise of synthetic biology for global health

The emerging field of synthetic biology has the potential to improve global health. For example, synthetic biology could contribute to efforts at vaccine development in a context in which vaccines and immunization have been identified by the international community as being crucial to international development efforts and, in particular, the millennium development goals. However, past experience with innovations shows that realizing a technology’s potential can be difficult and complex. To achieve better societal embedding of synthetic biology and to make sure it reaches its potential, science and technology development should be made more inclusive and interactive. Responsible research and innovation is based on the premise that a broad range of stakeholders with different views, needs and ideas should have a voice in the technological development and deployment process. The interactive learning and action (ILA) approach has been developed as a methodology to bring societal stakeholders into a science and technology development process. This paper proposes an ILA in five phases for an international effort, with national case studies, to develop socially robust applications of synthetic biology for global health, based on the example of vaccine development. The design is based on results of a recently initiated ILA project on synthetic biology; results from other interactive initiatives described in the literature; and examples of possible applications of synthetic biology for global health that are currently being developed.     

Information technology literacy among Nigerian microbiology students and professionals

Education and research in the discipline of microbiology is set for change as a result of computers being used as teaching and learning tools. In order to catalyse this change in Nigeria, previous computer experience, knowledge and attitude to computers of Nigerian microbiology students and professionals was determined. Our results indicate the need to increase the awareness of use and potentials of computers in microbiological research and education.     

The statistical frame of mind in systematic biology from quantitative zoology to biometry

The twentieth century witnessed a dramatic increase in the useof statistics by biologists, including systematists. The modern synthesis and new systematics stimulated thisdevelopment, particularly after World War II. The rise of ``thestatistical frame of mind' resulted in a rethinking of relationship between biological and mathematical points of theview, the roles of objectivity and subjectivity in systematicresearch, the implications of new computing technologies, and theplace of systematics among the biological disciplines.