Fungal genus Hypocrea/Trichoderma: from barcodes to biodiversity     

Kubicek CP  Komon-Zelazowska M  Druzhinina IS 《Journal of Zhejiang University. Science. B》2008,9(10):753-763

Hypocrea/Trichoderma is a genus of soil-borne or wood-decaying fungi containing members important to mankind as producers of industrial enzymes and biocontrol agents against plant pathogens, but also as opportunistic pathogens of immuno-compromised humans and animals, while others can cause damage to cultivated mushroom. With the recent advent of a reliable, BarCode-aided identification system for all known taxa of Trichoderma and Hypocrea, it became now possible to study some of the biological fundamentals of the diversity in this fungal genus in more detail. In this article, we will therefore review recent progress in (1) the understanding of the geographic distribution of individual taxa; (2) mechanisms of speciation leading to development of mushroom diseases and facultative human mycoses; and (3) the possible correlation of specific traits of secondary metabolism and molecular phylogeny.  相似文献   

Students’ meaning making in science: solving energy resource problems in virtual worlds combined with spreadsheets to develop graphs     

Ingeborg Krange  Hans Christian Arnseth 《Cultural Studies of Science Education》2012,7(3):585-605

The aim of this study is to scrutinize the characteristics of conceptual meaning making when students engage with virtual worlds in combination with a spreadsheet with the aim to develop graphs. We study how these tools and the representations they contain or enable students to construct serve to influence their understanding of energy resource consumption. The data were gathered in 1st grade upper-secondary science classes and they constitute the basis for the interaction analysis of students?? meaning making with representations. Our analyses demonstrate the difficulties involved in developing students?? orientation toward more conceptual orientations to representations of the knowledge domain. Virtual worlds do not in themselves represent a solution to this problem.  相似文献   

Adults' learning motivation: Expectancy of success,value, and the role of affective memories     

Julia Gorges  Christian Kandler 《Learning and individual differences》2012,22(5):610-617

The present study tested the applicability of expectancy-value theory to adults' learning motivation. Motivation was measured as the anticipated reaction (AR) of German students (N = 300) to receiving their instructions in English as a new learning opportunity. We used structural equation modeling to test our hypotheses. Expectancies of success and values from school predicted current expectancy and value, which, in turn, accounted for about 64% of variance in AR. In addition, we explicitly tested the hitherto neglected role of affective memories as a major precursor of value, expectancy of success, and AR. Results show a small direct effect of only negative affective memories on AR, leading to a significant incremental prediction of AR in addition to expectancy and value. Thus, motivation and experiences at secondary school appear to play a crucial role in adults' learning motivation, mediated by expectancy and value specific to the learning opportunity.  相似文献   

Buchbesprechungen     

Christian Brünner 《Zeitschrift für Hochschulrecht, Hochschulmanagement und Hochschulpolitik: zfhr》2012,11(2):103-104

  相似文献   

From Dogmatism to Open-Mindedness? Historical Reflections on Methods in Audience Reception Research     

Kim Christian Schrøder 《The Communication Review》2013,16(1-2):40-50

The article traces, from the perspective of audience reception research, the gradual methodological rapprochement of once hostile methodological paradigms: the quantitatively oriented uses-and-gratifications research and the qualitatively anchored reception research. While recognizing that the methodological differences stem ultimately from different epistemological perspectives, the article describes how these differences have been played out on the terrain of empirical methodologies for conducting fieldwork on audience practices and meanings. The article considers four stages of this rapprochement: (1) antagonistic self-sufficiency; (2) separate camps; (3) self-critical coexistence; and (4) complementarity and collaboration.  相似文献   

Motion Pictures     

Christian Metz  Ernest D. Rose  Walter E. Hurst  William Storm Hale  Edward Murray  Douglas Brode 《Communication Booknotes Quarterly》2013,44(8):94-96

Richard Bunce's Television in the Corporate Interest (New York: Praeger Special Studies, 1976—price not given, but about $15.00).

Ralph M. Jennings and Veronica M. Jefferson's Television Station Employment Practices, 1975: The Status of Minorities and Women (New York: Office of Communication, United Church of Christ, 1976—price not given, but about $10.00, paper)

Horace Newcomb's Television: The Critical View (New York: Oxford University Press, 1976—$4.00, paper)

Asa Berger's The TV-Guided American (New York: Walker, 1976—$8.95)

Vincent Mosco's The Regulation of Innovations in the Broadcasting Market (Cambridge, Mass.: Harvard University Program on Information Technologies and Public Policy, 1975—$3.00, paper)

James D. Scott's Cable Television: Strategy for Penetrating Key Urban Markets (Ann Arbor: University of Michigan Graduate School of Business Administration, 1976—$5.50, paper)

R.W. Chandler's Sparks at Sea: The Experiences of a Ship's Radio Officer (North Pomfret, Vt.: David and Charles, 1973, but only recently released in the U.S.—$9.50)  相似文献   

Dueling Fundamentalisms     

Christian O. Lundberg 《传播与批判/文化研究》2013,10(1):106-110

  相似文献   

Communication apprehension and the type‐a personality     

James B. Weaver III  Stephanie Lee Sargent  Christian Kiewitz 《Communication Research Reports》2013,30(3):350-355

Do Type‐A individuals experience communication apprehension? Consistent with theoretical expectations, the data at hand suggest the answer is a qualified “no.” Individuals evidencing a Type‐A personality reported significantly less CA than their Type‐B counterparts. This pattern of findings was strongest for apprehension about communicating in “collective” contexts (e.g., public, group, meeting) but diminished for CA in more “intimate” circumstances (e.g., interpersonal).  相似文献   

Falling in love and staying in love with science: ongoing informal science experiences support fascination for all children     

Rachel N. Bonnette  Kevin Crowley  Christian D. Schunn 《International Journal of Science Education》2013,35(12):1626-1643

ABSTRACT

Ages 10–14 mark a period in which children develop a strong sense of whether science is ‘for them,’ a time that typically coincides with the start of middle school in the United States and their first exposure to more rigorous science classes and testing. Experiences with science in and out of school can shape children's motivation to choose science careers or participate in voluntary science classes later on, for better or worse. We explore the hypothesis that children who engage in more informal educational science experiences at the start of this period are more likely than their peers to obtain and maintain interest, curiosity, and mastery goals in science (together forming a construct called fascination). We measured 983 children's fascination with science at the beginning and middle of sixth grade. We found that the children who participated in informal science during this time were more likely to maintain or have greater fascination than at the start. These findings held while also controlling for many potentially confounding covariates and are robust across subgroups by gender and race/ethnicity. Further, the effects are largest for those children whose family generally supports their learning.  相似文献   

The psychological characteristics of experiences that influence science motivation and content knowledge     

Meghan Bathgate  Christian Schunn 《International Journal of Science Education》2013,35(17):2402-2432

ABSTRACT

While motivational changes towards science are common during adolescence, our work asks which perceived classroom experiences are most strongly related to these changes. Additionally, we examine which experiences are most strongly associated with learning classroom content. In particular, using self-reports from a sample of approximately 3000 middle school students, this study investigates the influence of perceived science classroom experiences, namely student engagement and perceived success, on motivational change (fascination, values, competency belief) and content knowledge. Controlling for demographic information, school effects, and initial levels of motivation and content knowledge, we find that dimensions of engagement (affect, behavioural/cognitive) and perceived success are differentially associated with changes in particular motivational constructs and learning. Affective engagement is positively associated with motivational outcomes and negatively associated with learning outcomes, behavioural–cognitive engagement is associated only with learning, and perceived success is related only to motivational outcomes. Theoretical and practical implications are discussed.  相似文献