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1.
Méndez A Pérez C Montañéz JC Martínez G Aguilar CN 《Journal of Zhejiang University. Science. B》2011,12(12):961-968
The combined effects of pH and temperature on red pigment production and fungal morphology were evaluated in a submerged culture
of Penicillium purpurogenum GH2, using Czapek-Dox media with d-xylose as a carbon source. An experimental design with a factorial fix was used: three pH values (5, 7, and 9) and two temperature
levels (24 and 34 °C) were evaluated. The highest production of red pigment (2.46 g/L) was reached with a pH value of 5 and
a temperature of 24 °C. Biomass and red pigment production were not directly associated. This study demonstrates that P. purpurogenum GH2 produces a pigment of potential interest to the food industry. It also shows the feasibility of producing and obtaining
natural water-soluble pigments for potential use in food industries. A strong combined effect (p<0.05) of pH and temperature was associated with maximal red pigment production (2.46 g/L). 相似文献
2.
Catalina Rey-Guerra Henrik D. Zachrisson Eric Dearing Daniel Berry Susanne Kuger Margaret R. Burchinal Ane Nærde Thomas van Huizen Sylvana M. Côté 《Child development》2023,94(2):458-477
Whether high quantities of center-based care cause behavior problems is a controversial question. Studies using covariate adjustment for selection factors have detected relations between center care and behavior problems, but studies with stronger internal validity less often find such evidence. We examined whether within-child changes in hours in center-based care predicted changes in externalizing problems in toddlers and preschoolers (N = 10,105; 49% female; data collection 1993–2012) in seven studies, including from Germany, Netherlands, Norway, two from Canada and two from the U.S. Race/ethnicity data were only collected in the United States (57% and 80% White; 42% and 13% African-American; 1.2% and 5% Latinx). Meta-analyses showed no association (r = .00, p = .88) between hours in center-based care and externalizing problems. 相似文献
3.
This article studies the strategies for visibility of some of the most outstanding publications from Mexico, Venezuela, Brazil, Chile, Argentina, and Colombia, and the relationship between open access and the visibility of these journals. By means of in‐depth interviews with the editors, we explored their indexing and circulation strategies and examined certain organizational and contextual variables that may have helped them to remain in circulation. We also considered whether a combination of electronic publication and open access to the contents of the journals have increased the visibility of science from these developing countries. When these journals were not available electronically, even if they were distributed at no cost, their distribution was necessarily selective, and one could not properly speak of open access; once they were put on the Web, however, they became widely available at no cost to the reader. The editors' views on open access are also explored. 相似文献
4.
Catalina Sau Man Ng Wenyu Chai Hung Kit Fok Sing Pui Chan Ho Cheong Lam 《Journal of Early Childhood Teacher Education》2020,41(3):284-305
ABSTRACT Teaching Chinese to second language learners is a challenge for preschool teachers in Hong Kong so effective teacher professional development programmes are urgently needed to enhance their knowledge and skills. An Integrative Model Teacher Professional Development Programme which incorporates three theoretical underpinnings (i.e., culturally responsive teaching, meaningful and pleasurable learning, and effective teaching of Chinese as a second language) is designed to equip preschool teachers with knowledge, skills, and awareness in teaching Chinese to ethnic minority students. Through qualitative interviews with 15 in-service preschool teachers who joined the Programme, teachers’ perceptions and changes in three theoretical areas of teaching Chinese to ethnic minority students were explored. Particularly, teachers increased their awareness of ethnic minority cultures, developed empathy with ethnic minority children and their families, gained knowledge of implementing culturally responsive teaching and meaningful and pleasurable learning of Chinese. The role of teacher sharing in effective professional development was highlighted. 相似文献
5.
ABSTRACT As individuals increasingly write about their distressing experiences online, it is important to understand how perceived online audiences influence the effects of self-disclosure. In an experiment, participants wrote about recent breakups for online audiences purportedly varying in 1) whether they shared recent breakup experiences and 2) their ability to leave comments. Participants perceiving audiences with shared experience showed more cognitive processing in their writing and reported increased post-traumatic growth at follow-up than participants perceiving general audiences. Those anticipating comments wrote less about emotions than those who did not. Mechanisms accounting for the benefits of shared experience warrant further investigation. 相似文献
6.
We describe a recent project that explored combined use of Internet client-server technology and interactive computer modeling software for improving secondary science teaching. We envisioned a constructivist network in which teachers make contributions to the resources available. The purpose of the network was to promote the emerging field of computer modeling in high school science. Our approach coupled the networking and curricular initiatives with evaluation of changes in classroom core practices—those which have a traceable impact on student learning. Distribution of work, ideology of science, teaching styles, and curricular goals come together dynamically to influence teachers' use of modeling technology in the high school science classroom. A combination of Internet tools, each affording a different contribution to the spread of innovation, provides the best promise for future networks of this kind. 相似文献
7.
Catalina Lomos 《School Effectiveness & School Improvement》2017,28(2):276-291
Within comparative school effectiveness research facilitated by large-scale data across countries, this article presents the results of the testing for measurement invariance of the latent concept of Professional Community (PC) across 23 European countries and more than 35,000 teachers in secondary schools. The newly proposed Multiple-Group Factor Analysis Alignment method is applied to obtain the mean differences of the latent PC factor, while also identifying the non-invariant parameters in these different countries. After performing a number of robustness checks, including the Multiple-Group Confirmatory Factor Analysis (MGCFA) exact scalar method, we conclude that teachers in Eastern European countries report the highest average perceived PC practices. The countries with smaller PC mean differences tend to shift places in the ranking when the 2 methods are applied; however, very few changes among the groups with significant latent mean differences are observed. 相似文献
8.
Diego Collado Catalina Lomos Ides Nicaise 《School Effectiveness & School Improvement》2013,24(3):415-440
In Chile, the influence of the socioeconomic make-up of classrooms on achievement has been extensively studied in mathematics and language, but less in currently important non-traditional subjects such as civic knowledge. This paper analyses the effects of the socioeconomic composition of classrooms on students’ civic knowledge achievement in Chile, using the International Civic and Citizenship Education Study 2009 and a multilevel methodology. This research finds positive influences of higher socioeconomic intakes of 36% of one standard deviation in test scores. These results suggest that in the socioeconomically segregated Chilean education system, these effects would contribute to widening the civic knowledge attainment gap between pupils attending affluent and less affluent schools. In addition, this research finds that, on average, students with a higher individual socioeconomic status are more sensitive to these influences and that socioeconomic composition effects are more acute in the private-voucher sector than in the public sector. 相似文献
9.
The development of nonverbal working memory and executive control processes in adolescents 总被引：1，自引：0，他引：1
The prefrontal cortex modulates executive control processes and structurally matures throughout adolescence. Consistent with these events, prefrontal functions that demand high levels of executive control may mature later than those that require working memory but decreased control. To test this hypothesis, adolescents (9 to 20 years old) completed nonverbal working memory tasks with varying levels of executive demands. Findings suggest that recall-guided action for single units of spatial information develops until 11 to 12 years. The ability to maintain and manipulate multiple spatial units develops until 13 to 15 years. Strategic self-organization develops until ages 16 to 17 years. Recognition memory did not appear to develop over this age range. Implications for prefrontal cortex organization by level of processing are discussed. 相似文献
10.
Castellanos Elsa Catalina Olivas De Gunther Delgado Leonel 《Innovative Higher Education》2022,47(5):855-874
Innovative Higher Education - Researchers in universities are encouraged to produce innovative scientific research and participate in the international scientific community. In Mexico, public... 相似文献