1,738,687 research outputs found
A nuclear ribosomal DNA phylogeny of Acer inferred with maximum likelihood, splits graphs, and motif analysis of 606 sequences
Get PDF The multi-copy internal transcribed spacer (ITS) region of nuclear ribosomal DNA is widely used to infer phylogenetic relationships among closely related taxa. Here we use maximum likelihood (ML) and splits graph analyses to extract phylogenetic information from ~ 600 mostly cloned ITS sequences, representing 81 species and subspecies of Acer, and both species of its sister Dipteronia. Additional analyses compared sequence motifs in Acer and several hundred Ana-cardiaceae, Burseraceae, Meliaceae, Rutaceae, and Sapindaceae ITS sequences in GenBank. We also assessed the effects of using smaller data sets of consensus sequences with ambiguity coding (accounting for within-species variation) instead of the full (partly redundant) original sequences. Neighbor-nets and bipartition networks were used to visualize conflict among character state patterns. Species clusters observed in the trees and networks largely agree with morphology-based classifications; of de Jong's (1994) 16 sections, nine are supported in neighbor-net and bipartition networks, and ten by sequence motifs and the ML tree; of his 19 series, 14 are supported in networks, motifs, and the ML tree. Most nodes had higher bootstrap support with matrices of 105 or 40 consensus sequences than with the original matrix. Within-taxon ITS divergence did not differ between diploid and polyploid Acer, and there was little evidence of differentiated parental ITS haplotypes, suggesting that concerted evolution in Acer acts rapidly. </jats:p
Discover ACER India
Get PDFEstablished in 2005, ACER India is a wholly owned subsidiary of ACER that operates in South Asia and neighboring regions. Informed by ACER’s evidence-based approaches, we support policy reform and the development of innovative resources and tools to enable ongoing learning progres
Discover ACER India
Get PDFThis 2025 corporate profile highlights ACER India\u27s work supporting evidence-based policies and practices in South Asia. It includes collaborations and project highlights, in particular national assessment reform
Acer-platanoides-genotypes.csv
No full textRaw data created with genotyping 1048 individuals of Acer platanoides using 11 microsatellite markers
ACER 1996-1997, 67th Annual Report
Get PDFThis annual report for 1996-97 begins with ACER\u27s Role and Structure, presenting ACER\u27s guiding values, commitments, and goals, and discussing the origin and development of ACER, professional services, and organization and staffing. The report\u27s other sections are: Highlights of the Year for ACER (Research and Development; Organizational Developments; Staff Activities); Director\u27s Comment: Politicizing the Standards Debate; Measurement Division; Policy Research Division; International Development Division; ACER Press (Product Development; Publishing; Marketing and Customer Service); Corporate Services Division (The Cunningham Library; Computer Services; Personnel Services; Equal Opportunity Committee); Staff Publications and Professional Activities (Staff Publications; Staff Professional Activities outside ACER); Financial Report (Trends and Prospects; Directors\u27 Report; Auditor\u27s Report); Members of ACER Council; Members of ACER Staff; and Report from the Institutes of Educational Research
Relationships between hydraulic traits and habitat preference for six Acer species occurring in the French Alps
Get PDFXylem hydraulic properties and vulnerability to cavitation were studied in six Acer species which occur, in the French Alps, along a soil moisture gradient from the moist valleys to the drier mountain stands. The results obtained suggest that a relationship existed between hydraulic properties and the species moisture preference. Maples located in dry zones (A. opalus, A. monspessulanum) proved more resistant to drought-induced cavitation than species that occurred in an irrigated area (A. negundo, A. pseudoplatanus, A. platanoides, A. campestre). The most vulnerable species to cavitation (A. negundo, A. pseudoplatanus, A. platanoides, A. campestre) showed the highest hydraulic conductances, whereas more cavitation-resistant species (A. opalus, A. monspessulanum) had the lowest conductances. This suggests a tradeoff between hydraulic efficiency and cavitation vulnerability. The possible ecological significances of these data are discussed in relation to the distribution of Acer species in their natural habitats
ACER 1980-1981, Fifty-first Annual Report
Get PDFThe introduction to this annual report traces the history, activities, and growth of the Australian Council for Educational Research (ACER), and notes future challenges facing ACER. Abstracts are presented of seven papers which were delivered at the Invitational Conference on Societal Change held in August l980 at the University of Melbourne. Reports are given on the progress of six programs continuing under ACER\u27s sponsorship. These programs focus on: (1) learning and teaching; (2) social context of education; (3) measurement and evaluation; (4) library and information services; (5) survey and psychometric services; and (6) advisory services. Information on ACER publications and staff is include
ACER 1976-1977, Forty-seventh annual report
Get PDFThe 1976-77 annual report of the Australian Council for Educational Research (ACER) contains a tribute to the late director Dr. William C. Radford, a list of members of the council, the annual report of the director, a list of ACER staff, contributors to council funds, and information on state institutes for educational research. The annual report outlines three important areas of research activity in addition to curriculum research and development. These areas are studies in measurement and evaluation, learning and teaching, and the social foundations of education. Summaries are provided of surveys, reviews and comparative studies, curriculum innovations and evaluations, educational and psychological measurement projects and instruments, the ACER library, and ACER advisory services. Journals, books, reports, papers, and tests that were published are listed, and distribution services are outlined
ACER 1991-1992, 62nd Annual Report
Get PDFThis annual report examines recent changes in Australian education. Two strong emerging trends emerging are: increasing participation rates as more young people stay in the formal education system beyond the compulsory years and a shift in focus from the input in education to outcomes and sharpening of the way in which the outcomes are defined. The report includes: (1) Director\u27s Comment: Competence or Expertise?; (2) Highlights of the Year for ACER; (3) Research and Development Activities (Overview of Themes, Beyond the Compulsory School Years; Cognition, Technology and the Classroom; Teachers and Teaching; Educational Management and Change; Assessment and Reporting; Measurement Division Contract Projects; Testing Services; Product Development); (4) Other Activities (Library and Information Services; Development and Training; Management Developments; Publishing, Consultant and Marketing Services); (5) Staff Publications; (6) Financial Report (Overview; Director\u27s Statement; Auditor\u27s Report); (7) Members of ACER Council; (8) Members of ACER Staff; and (9) Report from the Institutes of Educational Research
ACER Research Conference Proceedings (2015)
Get PDFIt is indeed timely that Research Conference 2015 addresses the theme Learning Assessments: Designing the future. It is six years since our Research Conference considered issues in assessment, and the landscape is being significantly transformed. Not only is Australia’s school curriculum changing, but related issues of teaching quality and assessment practice are hot topics here and in many other countries. This transforming landscape includes changes in thinking about the fundamental purposes of assessment; growing demands for the assessment of a broader range of student skills and capabilities; and new technologies that allow us to gather and visualise information about student learning more efficiently and thoroughly than ever before. Whether we are teachers, researchers, leaders of schools or systems, we must not forget that improving learning is at the heart of assessment. As Dr Rukmini Banerji — a keynote speaker at this conference — says, assessment must be followed by action. Papers at Research Conference 2015 indicate that as we understand more about learning and pursue solutions to the issues we face, new challenges are emerging. ACER has listened to many educators through our Rolling Summit on Assessment Reform and Innovation. We recognise that schools and nations are looking for sound evidence to inform their actions, and trust that this conference will provide you with both information and inspiration to contribute to designing the future of assessment
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