Red pigment production by Penicillium purpurogenum GH2 is influenced by pH and temperature     

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   

Child and Adolescent Predictors of Personality in Early Adulthood          下载免费PDF全文

Maria Wängqvist  Michael E. Lamb  Ann Frisén  C. Philip Hwang 《Child development》2015,86(4):1253-1261

This study investigated development of the Big Five personality traits from early childhood into adulthood. An initial group of 137 Swedish children were assessed eight times between ages 2 and 29 years. Initial decreases in extraversion leveled off in early adulthood; agreeableness and conscientiousness increased from ages 2 to 29; neuroticism initially increased, leveled off in later childhood and adolescence, and decreased throughout early adulthood; while openness to experience showed an initial increase, then decreased and leveled off in early adulthood. Individual developmental trajectories varied significantly, particularly in relation to gender. Personality traits became increasingly stable, and the fact that childhood scores predicted scores in adulthood indicated that personalities are fairly stable across this portion of the life span.  相似文献   

Revisiting the Collective in Critical Consciousness: Diverse Sociopolitical Wisdoms and Ontological Healing in Sociopolitical Development     

Sonia Abigail Sánchez Carmen  Michael Domínguez  Andrew Cory Greene  Elizabeth Mendoza  Michelle Fine  Helen A. Neville  Kris D. Gutiérrez 《The Urban Review》2015,47(5):824-846

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What do families of the ‘professional and managerial’ class educate their children for? The links between happiness and autonomy     

Jordi Collet-Sabé  Antoni Tort 《British Journal of Sociology of Education》2015,36(2):234-249

Based on a qualitative study involving 124 professional and managerial class families in Catalonia (Spain), this paper describes the aims and objectives these families have for the education of their children. During the fieldwork, when asked what they were aiming for in the education of their children, almost all of the parents replied ‘for them to be happy’. But what kind of happiness are they talking about? What kind of education might lead to happiness? Drawing principally on the work of Kellerhals and Montandon and their ‘contractual model of education’ and Bauman’s concepts of ‘secondary security’ and ‘homo eligens’, although also taking into account the related contributions of Lareau, Vincent and Ball, Stefansen and Aarseth, and Kusserow, the paper aims to demonstrate the strong connection these families make between happiness and ‘absolute’ autonomy, understood as two sides of the same coin and seen, by the participants, as the guiding principle that should shape the way they bring their children up.  相似文献   

The possibilities and limits of the structure–agency dialectic in advancing science for all     

Kris D. Gutiérrez  Angela Calabrese Barton 《科学教学研究杂志》2015,52(4):574-583

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Announcements     

Jérôme Rossier 《International Journal for Educational and Vocational Guidance》2015,15(2):185-190

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Longitudinal assessment of progress in reasoning capacity and relation with self-estimation of knowledge base     

Anne Collard  France Mélot  Jean-Pierre Bourguignon 《Assessment & Evaluation in Higher Education》2015,40(1):74-88

The aim of the study was to investigate progress in reasoning capacity and knowledge base appraisal in a longitudinal analysis of data from summative evaluation throughout a medical problem-based learning curriculum. The scores in multidisciplinary discussion of a clinical case and multiple choice questionnaires (MCQs) were studied longitudinally for 213 students from years 2 to 5. The capacity of core knowledge delimitation was calculated as the difference between the levels of average ascertainment degrees given for correct and incorrect answers at MCQ. For both multidisciplinary discussion of a clinical case evaluation and self-estimation of core knowledge, the capacity increases throughout the curriculum. The reasoning capacity assessed through multidisciplinary discussion of a clinical case is positively correlated with MCQ scores and the capacity to discriminate the mastered core knowledge. In conclusion, this study indicates that self-estimation of core knowledge is associated with an increase in reasoning performance through a well-organised knowledge base. Since that ability is related to success or failure, it is suggested that student awareness about delimitation of mastered core knowledge is considered as part of learning.  相似文献   

Design-Based Research Within the Constraints of Practice: AlgebraByExample     

Julie L. Booth  Laura A. Cooper  Alexandra Huyghe  Kenneth R. Koedinger  E. Juliana Paré-Blagoev 《Journal of Education for Students Placed at Risk》2015,20(1-2):79-100

Superintendents from districts in the Minority Student Achievement Network (MSAN) challenged the Strategic Education Research Partnership (SERP) to identify an approach to narrowing the minority student achievement gap in Algebra 1 without isolating minority students for intervention. SERP partnered with 8 MSAN districts and researchers from 3 universities to design and rigorously test AlgebraByExample, a set of 42 Algebra 1 assignments with interleaved worked examples that target common misconceptions and errors. In a year-long random-assignment study, students who received AlgebraByExample assignments had an average 7 percentage point boost on a posttest containing released items from state assessments, and students in the bottom half of the performance distribution where minority students are disproportionately concentrated had an average 10 percentage point boost on a researcher-designed assessment of conceptual understanding. AlgebraByExample is easily incorporated into any existing curriculum, and naturally serves as a launch point for mathematically rich discussion.  相似文献   

Developmental Changes in the Relations Between RAN,Phonological Awareness,and Reading in Spanish Children     

Cristina Rodríguez  Madelon van den Boer  Juan E. Jiménez  Peter F. de Jong 《Scientific Studies of Reading》2015,19(4):273-288

We examined the developmental relations of phonological awareness (PA) and rapid automatized naming (RAN) with reading in a cross-sectional study with 874 Spanish children from Grades 2 to 6. Our main prediction was that the RAN–reading relationship would decrease due to a gradual change in reading strategy, from serial decoding to sight word reading. Therefore, in contrast to most previous studies, we used discrete reading tasks. Serial RAN tasks for objects, colors, digits, and letters were included. First, we examined whether the RAN tasks loaded on the same constructs across time. An alphanumeric and a nonalphanumeric factor were identified, which were invariant over time. In subsequent multigroup structural equation models we found that the PA–reading relationship was low but slightly increased in the higher grades. As predicted, the RAN–reading relationship decreased for words, whereas the relationship remained stable for pseudowords.  相似文献   

Suprasegmental Phonology Development and Reading Acquisition: A Longitudinal Study     

Nuria Calet  Nicolás Gutiérrez-Palma  Ian C. Simpson  M. Carmen González-Trujillo  Sylvia Defior 《Scientific Studies of Reading》2015,19(1):51-71

Previous studies implicate suprasegmental phonology in reading acquisition. However, little is known about how suprasegmental sensitivity develops or how it contributes to reading. Here, 130 Spanish primary-school children participated in this 2-year longitudinal study. Nonlinguistic rhythm, lexical-stress sensitivity and metrical-stress sensitivity, along with phonological awareness, vocabulary, nonverbal intelligence, and reading aloud, were assessed on five occasions. Results suggest that prosody abilities have different developmental trajectories and that prosody explains unique variance in reading beyond that explained by other factors. There was some evidence that the contribution of each prosody skill occurred at different phases in reading development. Nonlinguistic rhythm, lexical-stress sensitivity, and metrical-stress sensitivity assessed at the end of kindergarten, the start of Grade 1, and the end of Grade 1, respectively, predicted reading performance 6 months later. Nevertheless, sample size and reliability temper the conclusions that can be made. The implications of prosody skills for literacy development are discussed.  相似文献