38,747 results on '"Ben A"'
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2. Ecology. Avoiding (re)extinction.
- Author
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Minteer BA, Collins JP, Love KE, and Puschendorf R
- Subjects
- Animals, Genetic Techniques, Photography, Population Density, Biology methods, Classification methods, Endangered Species, Extinction, Biological
- Published
- 2014
- Full Text
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3. Bioinformatics as a Means to Attract Women to Computer Science
- Author
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Sara Genut and Yifat Ben-David Kolikant
- Abstract
Programs in bioinformatics, offered in many academic institutes, are assumed to expand women's representation in computer science (CS). Women's enrolment in these programs is high. Our questions are: Do these programs attract different women from those attracted to CS programs? What factors underlie women's decision to enroll in bioinformatics programs? How do these factors differ from those of women who choose CS, if at all? What career opportunities do these women anticipate and pursue? Using questionnaires and interviews, we found a statistically significant difference between the factors that motivate women to choose bioinformatics and others to study CS. Many bioinformatics students did not consider CS as an alternative. Post-facto they learned to love computing, albeit with a biology-oriented purpose. "Computing with purpose" underlies many participants' pursuit of careers in research, CS, and bio-tech. We thus conclude that bioinformatics programs do indeed expand women's representation in CS.
- Published
- 2023
4. Curated Collection: Modeling and Applications
- Author
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Ethan Berkove and Ben Galluzzo
- Abstract
This curated collection covers a selection of PRIMUS articles published over a roughly 12-year period that focus on modeling and applications. The collection includes sections on individual projects, courses with a significant modeling component, and modeling and applications in extracurricular settings and throughout the curriculum.
- Published
- 2024
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5. Science Teachers' Views on the Use and Effectiveness of Interactive Simulations in Science Teaching and Learning
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Ben Ouahi, Mham, Lamri, Driss, Hassouni, Taoufik, and Al Ibrahmi, El Mehdi
- Abstract
The objective of this article is to identify and discuss the views of teachers of physics-chemistry (Ph-Ch) and Life and Earth Sciences (LES) on the use and effectiveness of interactive simulations PhET (Physics Education Technology) in student teaching and learning. A survey research method was used in this study. 114 Moroccan science teachers (67 Ph-Ch; 47 LES) at middle and high schools were surveyed. The quantitative analysis was performed to provide insight into who uses PhET simulations, why they use them, and how they are used. The data collected was analyzed using Statistical Package for the Social Sciences (SPSS) software. The results indicate that the use of interactive simulations in investigative science teaching and learning is very effective for both teachers and students, despite the presence of a set of obstacles that hinder the use of classroom simulations. The implication of this research is that the use of interactive simulations in science teaching in Morocco can enhance learning activities and help students to understand scientific concepts effectively.
- Published
- 2022
6. A CURE on the Evolution of Antibiotic Resistance in 'Escherichia coli' Improves Student Conceptual Understanding
- Author
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Freeman, Scott, Mukerji, Joya, Sievers, Matt, Beltran, Ismael Barreras, Dickinson, Katie, Dy, Grace E. C., Gardiner, Amanda, Glenski, Elizabeth H., Hill, Mariah J., Kerr, Ben, Monet, Deja, Reemts, Connor, Theobald, Elli, Tran, Elisa T., Velasco, Vicente, Wachtell, Lexi, and Warfield, Liz
- Abstract
We developed labs on the evolution of antibiotic resistance to assess the costs and benefits of replacing traditional laboratory exercises in an introductory biology course for majors with a course-based undergraduate research experience (CURE). To assess whether participating in the CURE imposed a cost in terms of exam performance, we implemented a quasi-experiment in which four lab sections in the same term of the same course did the CURE labs, while all other students did traditional labs. To assess whether participating in the CURE impacted other aspects of student learning, we implemented a second quasi-experiment in which all students either did traditional labs over a two-quarter sequence or did CURE labs over a two-quarter sequence. Data from the first experiment showed minimal impact on CURE students' exam scores, while data from the second experiment showed that CURE students demonstrated a better understanding of the culture of scientific research and a more expert-like understanding of evolution by natural selection. We did not find disproportionate costs or benefits for CURE students from groups that are minoritized in science, technology, engineering, and mathematics.
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- 2023
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7. The Influence of Flipped Learning Methods on High School Learners' Biology Attainment and Social Intelligence in Kuwait
- Author
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Ebrahim, Ali Hassan and Naji, Salwa A. Ben
- Abstract
The present study aims to discuss the influence of the flipped learning method (FLM)--on high school biology learners to improve the results of their biology attainment tests along with their use of social interactions while learning. By applying quasi-experimental study, 37 female high school biology learners in 2 intact grade 10 classes in Kuwait were selected as the study objects. A class was randomly chosen as the experimental group and another class as the control group. The students in the experimental group applied flipped learning strategy while the control group applied the traditional direct method. The teaching experiment for both classes lasted for 5 weeks (10 sessions). Using an attainment test administered by the teacher as a pretest and a post-test, the attainment of the biology students was measured. The researchers also conducted a survey to examine their social intelligence and it was given along with the pretest and the post-test. The breakdown of the attainment test results showed that flipped learning methods actually have (p < 0.05) more positive influence on the students' attainment than the direct methods. The learners under the flipped teaching methods outperformed the learners under the direct methods on their attainment learning. However, as for the results of their social intelligence, the ANCOVA test revealed a non-significant difference between the two classes whether they were under the influence of flipped learning methods or the direct teaching methods due to some reasons mentioned later in this paper. Still, flipped learning method effect on the student' learning attainment led to positive results and would lead other teachers to implement FLM in Kuwaiti classrooms. The researchers also suggest that the College of Education at Kuwait University train pre-service teachers to apply modern teaching strategies, such as FLM. This paper presents an important topic. It summaries primary literature concerning flipped classrooms compared to direct teaching methods, discusses limitations of both methods, clarifies benefits of flipped learning methods, and offers recommendations for teachers to implement flipped learning methods.
- Published
- 2021
8. How Can Learners Explain Phenomena in Ecology Using Evolutionary Evidence from Informal Learning Environments as Resources?
- Author
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Nesimyan -- Agadi, Dina and Ben Zvi Assaraf, Orit
- Abstract
The theory of evolution can be a useful basis for developing students' understanding of ecology. Our study used concept maps to examine the development of sixth-grade students' understanding of the Antarctic ecosystem following several evolution 'Science Days' conducted at 'Nature Campus' -- an informal learning environment comprised of a natural history museum, zoological and botanical gardens. The programme included physical experiences, such as observations and measurements of fossils, skeletons and mounted specimens, and observations in the zoological and botanical gardens. After the first and fourth days, the students watched the film 'March of the Penguins,' and were asked to draw concept maps depicting the penguins' lives. These maps were then analysed to assess: (a) the changes in the students' depictions of the ecosystem's complexity, and (b) the manner and extent to which they used ideas and concepts in evolution to explain phenomena in the Antarctic ecosystem. We found that the students' concept maps increased in complexity, and their post-maps incorporated concepts in evolution from their experiences at Nature Campus. Our results therefore emphasise the benefits of fundamentally changing how biology education is divided and defined, and transitioning to a more holistic approach that acknowledges the interdisciplinary nature of biological phenomena.
- Published
- 2023
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9. Epigenetics: What Do Psychologists Need to Know?
- Author
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Hayes, Ben
- Abstract
This paper reviews the rapidly developing field of epigenetics, providing an accessible explanation of the key ideas and some illustrative examples of work in the field. Although very much a biological discipline the implications of the developing knowledge in this area are very significant for educational psychologists and this paper aims to provide an introduction to what is becoming a very significant shift in how people think about learning and development. Understanding the processes that underlie epigenetic change and the research that the new knowledge is based on will be important for educational psychologists in order to understand this important developing area of thinking about development and learning. Consensus is growing that intergenerational transmission of epigenetic changes are a reliable phenomenon, establishing the principle of the inheritance of acquired characteristics. This contrasts starkly with models of biological determinism and provides a new way of thinking about educational and societal change.
- Published
- 2018
10. A Tale of Two Institutions: Analyzing the Impact of Gamified Student Response Systems on Student Anxiety in Two Different Introductory Biology Courses
- Author
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Adkins-Jablonsky, Sarah J., Shaffer, Justin F., Morris, J. Jeffrey, England, Ben, and Raut, Samiksha
- Abstract
Anxiety can impact overall performance and persistence in college. Student response systems (SRSs), real-time active-learning technologies used to engage students and gauge their understanding, have been shown to elicit anxiety for some students. Kahoot! is an SRS technology that differs from others in that it involves gamification, the use of gamelike elements. Recent studies have explored the impact of active-learning strategies on student anxiety across different institutions, but there is little known about how Kahoot! impacts student perceived anxiety, especially in comparison with other active-learning strategies. In two complementary yet parallel studies of introductory biology courses at a western research-intensive institution (n = 694) and a southeastern research-intensive institution (n = 60), we measured students' perceived anxiety. We then explored how students were influenced by nongraded Kahoot! play and other elements of instruction. Using previously developed and course-specific pre- and post-course surveys, we found students at both universities agreed that nongraded Kahoot! play caused less anxiety compared with other pedagogical practices, such as working in small groups or reading the textbook. After playing Kahoot!, lower-performing students demonstrated greater engagement and lower levels of anxiety compared with their peers, suggesting that Kahoot! may be a particularly engaging active-learning strategy for these students.
- Published
- 2021
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11. Digital Policy Sociology: Software and Science in Data-Intensive Precision Education
- Author
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Williamson, Ben
- Abstract
Software code, algorithms, data analytics and infrastructures have become inseparable from policy processes and modes of governance. This article introduces 'digital policy sociology' as a way of studying the role and influence of digital technologies in education policy. Building on existing 'policy sociology' approaches combined with emerging insights rom 'digital sociology', digital policy sociology extends the analytical gaze to new technical actors -- nonhuman software and hardware, as well as human experts, technology companies, and promotional organizations. As a case study exemplar, the analysis focuses on an emerging domain of data-intensive science and technology with significant implications for education policy in the future. 'Precision education' is an emerging combination of psychological, neuroscientific and genetic expertise, with a particular emphasis on using advanced computational technologies to produce 'intimate data' about students' bodies and biological associations with learning. These intimate data have potential to become new sources of biological policy knowledge, raising significant methodological and analytical challenges for policy sociology.
- Published
- 2021
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12. Bringing up the Bio-Datafied Child: Scientific and Ethical Controversies over Computational Biology in Education
- Author
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Williamson, Ben
- Abstract
Scientific advances in genetic analysis have been made possible in recent years by technical developments in computational biology, or bioinformatics. Bioinformatics has opened up the human genome to diverse analyses involving automated laboratory hardware and machine learning algorithms and software. As part of an emerging field of social genomics, recent educational genetics studies using big data have begun to raise challenging findings linking DNA to predicted life outcomes. Bioinformatic technologies and techniques including 'genome-wide association' and 'polygenic scoring' are producing new kinds of genetic biodata and expert knowledge for rethinking the upbringing and education of children. This article takes as an empirical opening a recent epistemic and ethical controversy over the use of biodata to make genetic predictions about educational, socio-economic and life outcomes, detailing the forms of expert knowledge and technologies involved these predictions, and exploring the social and ethical implications of data-intensive bioinformatics.
- Published
- 2020
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13. A Rapid Protocol for Generating Arthropod DNA Barcodes Suitable for Use with Undergraduate Students
- Author
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Brown, Grant R., Dagen, Claire, O'Donnell, Ben Reilly, and Graves, Jeff A.
- Abstract
We provide a protocol for rapid DNA extraction from spiders suitable for undergraduate practical sessions. Students who were previously naïve to the theory and laboratory technique of DNA barcoding were successfully able to extract and recover 29 DNA sequences from 16 species of small spiders in the family Linyphiidae. We anticipate that with careful selection of specimens, undergraduate students could participate in sessions which both benefit their professional development and further taxonomic understanding across a variety of organisms.
- Published
- 2020
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14. Recurring Patterns in the Development of High School Biology Students' System Thinking over Time
- Author
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Tripto, Jaklin, Assaraf, Orit Ben Zvi, and Amit, Miriam
- Abstract
The goal of this study was to identify and understand the mental models developed by 67 high school biology students as they learn about the human body as a complex system. Using concept maps, it sought to find an external way of representing how students organize their ideas about the human body system in their minds. We conducted a qualitative analysis of four concept maps created by each student throughout the 3-year learning process, which allowed us to identify that student's systems thinking skills and the development of those skills over time. The improvement trajectories of the students were defined according to three central characteristics of complex systems: (a) hierarchy, (b) homeostasis and (c) dynamism. A comparative analysis of all of our students' individual trajectories together revealed four typical learning patterns, each of which reflects a different form of development for systems thinking: "from the structure to the process level", "from macro to micro level", "from the cellular level to the organism level," and "development in complexity of homeostasis mechanisms". Despite their differences, each of these models developed over time from simpler structures, which evolved as they connected with more complex system aspects, and each indicates advancement in the student's systems thinking.
- Published
- 2018
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15. Comparison of Normalized Gain and Cohen's 'd' for Analyzing Gains on Concept Inventories
- Author
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Nissen, Jayson M., Talbot, Robert M., Thompson, Amreen Nasim, and Van Dusen, Ben
- Abstract
Measuring student learning is a complicated but necessary task for understanding the effectiveness of instruction and issues of equity in college science, technology, engineering, and mathematics (STEM) courses. Our investigation focused on the implications on claims about student learning that result from choosing between one of two commonly used metrics for analyzing shifts in concept inventories. The metrics are normalized gain ("g"), which is the most common method used in physics education research and other discipline-based education research fields, and Cohen's "d," which is broadly used in education research and many other fields. Data for the analyses came from the Learning About STEM Student Outcomes (LASSO) database and included test scores from 4551 students on physics, chemistry, biology, and math concept inventories from 89 courses at 17 institutions from across the United States. We compared the two metrics across all the concept inventories. The results showed that the two metrics lead to different inferences about student learning and equity due to the finding that "g" is biased in favor of high pretest populations. We discuss recommendations for the analysis and reporting of findings on student learning data.
- Published
- 2018
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16. How Is the Body's Systemic Nature Manifested amongst High School Biology Students?
- Author
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Tripto, Jaklin, Assaraf, Orit Ben, Snapir, Zohar, and Amit, Miriam
- Abstract
This study follows two groups of students (67 in all) through the 3 years of their high school biology education and examines the development of their systems thinking--specifically their models of the human body as a system. Both groups were composed of biology majors, but the students in one group also participated in a PBLbased extension program called "Medical Systems". Data was gathered by means of concept maps, which the students completed at four strategic stages of the learning process: beginning of 10th grade, end of 10th grade, end of 11th grade and end of 12th grade. At the end of the 3 year learning process, the students' showed more complex system models. They included a wider range of concepts in their maps, spanning hierarchy levels ranging from the molecular and cellular to the system level. We also found an increase in references to dynamic interactions, but this did not encourage the students to use cellular level processes when explaining phenomena that occur at the systems level. The impact of the PBL teaching method was strongly evident in the complexity of the Medical Systems program students' concept maps, which heavily emphasized "hierarchy" and "diseases" as system characteristics.
- Published
- 2017
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17. Characterising the Development of the Understanding of Human Body Systems in High-School Biology Students--A Longitudinal Study
- Author
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Snapir, Zohar, Eberbach, Catherine, Ben-Zvi-Assaraf, Orit, Hmelo-Silver, Cindy, and Tripto, Jaklin
- Abstract
Science education today has become increasingly focused on research into complex natural, social and technological systems. In this study, we examined the development of high-school biology students' systems understanding of the human body, in a three-year longitudinal study. The development of the students' system understanding was evaluated using the Components Mechanisms Phenomena (CMP) framework for conceptual representation. We coded and analysed the repertory grid personal constructs of 67 high-school biology students at 4 points throughout the study. Our data analysis builds on the assumption that systems understanding entails a perception of all the system categories, including structures within the system (its Components), specific processes and interactions at the macro and micro levels (Mechanisms), and the Phenomena that present the macro scale of processes and patterns within a system. Our findings suggest that as the learning process progressed, the systems understanding of our students became more advanced, moving forward within each of the major CMP categories. Moreover, there was an increase in the mechanism complexity presented by the students, manifested by more students describing mechanisms at the molecular level. Thus, the "mechanism" category and the micro level are critical components that enable students to understand system-level phenomena such as homeostasis.
- Published
- 2017
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18. The 'What Is a System' Reflection Interview as a Knowledge Integration Activity for High School Students' Understanding of Complex Systems in Human Biology
- Author
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Tripto, Jaklin, Ben-Zvi Assaraf, Orit, Snapir, Zohar, and Amit, Miriam
- Abstract
This study examined the reflection interview as a tool for assessing and facilitating the use of "systems language" amongst 11th grade students who have recently completed their first year of high school biology. Eighty-three students composed two concept maps in the 10th grade--one at the beginning of the school year and one at its end. The first part of the interview is dedicated to guiding the students through comparing their two concept maps and by means of both explicit and non-explicit teaching. Our study showed that the explicit guidance in comparing the two concept maps was more effective than the non-explicit, eliciting a variety of different, more specific, types of interactions and patterns (e.g. "hierarchy", "dynamism", "homeostasis") in the students' descriptions of the human body system. The reflection interview as a knowledge integration activity was found to be an effective tool for assessing the subjects' conceptual models of 'system complexity', and for identifying those aspects of a system that are most commonly misunderstood.
- Published
- 2016
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19. Putting PhDs to Work: Career Planning for Today's Scientist
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Hobin, Jennifer A., Clifford, Philip S., and Dunn, Ben M.
- Abstract
Individual development plans (IDPs) have been promoted nationally as a tool to help research trainees explore career opportunities and set career goals. Despite the interest in IDPs from a policy perspective, there is little information about how they have been used. The authors examined IDP awareness and use, the benefits of creating an IDP, and ways to facilitate its use by administering a survey to current or former postdoctoral researchers via the National Postdoctoral Association (NPA) and University of Alabama at Birmingham email lists; individuals belonging to Federation of American Societies for Experimental Biology member societies who mentored postdocs; and postdoctoral administrators at member institutions of the Association of American Medical Colleges and the NPA. Although most postdoctoral administrators (>80%) were familiar with IDPs, less than 50% of postdocs and only 20% of mentors were aware of IDPs. For those postdocs and mentors who reported creating an IDP, the process helped postdocs to identify the skills and abilities necessary for career success and facilitated communication between postdocs and their mentors. Despite the fact that creating an IDP benefits postdocs and mentors, IDP use will likely remain low unless institutions and research mentors encourage trainees to engage in this process. [Supplemental material for this article can be found at: http://www.lifescied.org/content/suppl/2014/02/12/13.1.49.DC1.html.]
- Published
- 2014
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20. Teaching Science with Web-Based Inquiry Projects: An Exploratory Investigation
- Author
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Webb, Aubree M., Knight, Stephanie L., Wu, X. Ben, and Schielack, Jane F.
- Abstract
The purpose of this research is to explore a new computer-based interactive learning approach to assess the impact on student learning and attitudes toward science in a large university ecology classroom. A comparison was done with an established program to measure the relative impact of the new approach. The first inquiry project, BearCam, gives learners the freedom to navigate bear images and videos online to complete a scientific report. The new program, Virtual Ecological Inquiry (VEI), is based in the Second-Life platform and allows students to create an avatar and explore the Wolong Nature Reserve, collecting plant and environmental data in virtual form. Both inquiry projects show potential to engage learners and promote the acquisition of investigative practices and processes within inquiry. Inquiry assessment methods and changes to the VEI program are shared.
- Published
- 2014
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21. High School Students' Understanding of the Human Body System
- Author
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Assaraf, Orit Ben-Zvi, Dodick, Jeff, and Tripto, Jaklin
- Abstract
In this study, 120 tenth-grade students from 8 schools were examined to determine the extent of their ability to perceive the human body as a system after completing the first stage in their biology curriculum--"The human body, emphasizing homeostasis". The students' systems thinking was analyzed according to the STH thinking model, which roughly divides it into three main levels that are arranged "pyramid" style, in an ascending order of difficulty: 1. Analysis of system components--the ability to identify the components and processes existing in the human body system; 2. Synthesis of system components--ability to identify dynamic relations within the system; 3. Implementation--ability to generalize and identify patterns in the system, and to identify its hidden dimensions. The students in this study proved largely incapable of achieving systems thinking beyond the primary STH level of identifying components. An overwhelming majority if their responses corresponded to this level of the STH model, further indicating a pronounced favoring of structure over process, and of larger, macro elements over microscopic ones.
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- 2013
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22. Revisiting Curriculum Inquiry: The Role of Visual Representations
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Eilam, Billie and Ben-Peretz, Miriam
- Abstract
How do visual representations (VRs) in curriculum materials influence theoretical curriculum frameworks? Suggesting that VRs' integration into curriculum materials affords a different lens for perceiving and understanding the curriculum domain, this study draws on a curricular perspective in relation to multi-representations in texts rather than the predominant cognitive, art, communication, or media perspectives. It examines VRs' impact on the meaning of the text and on central curriculum theories and concepts, highlighting VRs' important, but overlooked, role in curriculum deliberations. For examining VRs as linked to the text and to curriculum frameworks, the part-whole relationship approach was used on three levels. It is suggested that VRs' versatility speaks simultaneously to all of the curriculum commonplaces, thus possibly serving as a unifying factor during processes of curriculum deliberation. (Contains 4 figures and 11 notes.)
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- 2010
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23. On Random Numbers and Design
- Author
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Ben-Ari, Morechai
- Abstract
The term "random" is frequently used in discussion of the theory of evolution, even though the mathematical concept of randomness is problematic and of little relevance in the theory. Therefore, since the core concept of the theory of evolution is the non-random process of natural selection, the term random should not be used in teaching the theory. Furthermore, biologists have developed computer programs to simulate evolution that are ostensibly based upon randomness, yet they do not disclose that these programs use deterministic random number generators. Thus another argument against the use of the term random in teaching evolution is that this determinism is liable to be invoked by creationists.
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- 2004
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24. Gel Separation of Isozymes To Study Relatedness of Common Bean Cultivars from ARound the World.
- Author
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Hammond, Paul, Oxley, Mary, and Ealing, Ben
- Abstract
Explains a three week laboratory experiment on the gel separation of peroxidase, which is the most well-known isozyme, from beans. Includes suggestions on the laboratory management. (Contains 13 references.) (YDS)
- Published
- 2002
25. Classifying Microorganisms.
- Author
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Baker, William P., Leyva, Kathryn J., Lang, Michael, and Goodmanis, Ben
- Abstract
Focuses on an activity in which students sample air at school and generate ideas about how to classify the microorganisms they observe. The results are used to compare air quality among schools via the Internet. Supports the development of scientific inquiry and technology skills. (DDR)
- Published
- 2002
26. What Do Curriculum Developers Do?
- Author
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Peretz, Miriam Ben and Tamir, Pinchas
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This study was designed to analyze the process of curriculum development adopted by developers in language arts, biology, and geography, in a centralized educational system. Specific objectives were to identify naturalistic models of curriculum development used in curriculum projects in Israel; point out relationships between contextual factors (such as location of development teams in universities or in the Ministry of Education) and the characteristics of the development process; and uncover elements of the personal, practical knowledge of the participants in the development process. Among the findings reported and discussed are those indicating that: (1) the average time of development of a project was 3 to 5 years; (2) almost all projects have engaged in formative evaluation; (3) all projects were funded by the Ministry of Education; and (4) although organizational characteristics of individual projects varied, several modes of operation could be identified. For example, two modes of cooperation and interaction (group interaction and linear mode of team work) were identified across all projects. One conclusion reported from analyses of the curriculum projects and from interviews with the curriculum developers is that there is not one naturalistic model of development; every project examined has its own special blend of characteristics. (JN)
- Published
- 1984
27. Student Self-Assessment in HOCS Science Examinations: Is There a Problem?
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Ben-Chaim, David and Zoller, Uri
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Reports the results of a self-assessment questionnaire containing higher-order-cognitive skills types of questions administered to biology majors (N=71). Results indicate that the majority of students in the study rate themselves as capable of self-assessment. Contain 41 references. (DDR)
- Published
- 1998
28. Big Bioinformational Education Sciences: New Biodigital Methods and Knowledge Production in Education
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Williamson, Ben, Jandrić, Petar, Series Editor, Escaño González, Carlos, Editorial Board Member, Ford, Derek R., Editorial Board Member, Hayes, Sarah, Editorial Board Member, Kerres, Michael, Editorial Board Member, Knox, Jeremy, Editorial Board Member, Peters, Michael A., Editorial Board Member, Tesar, Marek, Editorial Board Member, and MacKenzie, Alison, editor
- Published
- 2023
- Full Text
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29. Clockagen : understanding and quantifying the link between collagen and the circadian clock through mathematical modelling
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Calverley, Ben, Kadler, Karl, and Shearer, Tom
- Subjects
Quantitation ,Circadian ,Mechanics ,Biology ,Mathematics ,Collagen - Abstract
Without collagen, our bodies would have no structural integrity. As the most abundant protein in metazoan bodies it makes up the majority of the mass of tissues including bone, muscle, tendon, ligament, and cornea. The ability of vertebrate cells to assemble complex tissues capable of withstanding a lifetime of cyclical loading is directly due to an extracellular matrix (ECM) where collagen is assembled in roughly cylindrical fibrils. The fibrils can be centimetres (perhaps metres in large animals such as whales and giraffes) in length and provide a scaffold that both protects cells from environmental forces and maintains the shape and form of organs. A more complete understanding of how these scaffolds are maintained would have important ramifications in diseases where the collagen network is disrupted or abnormal, including osteoarthritis, fibrosis, and cancer. It was long thought that collagen is permanent in mammalian ECM. However recent studies have shown that cells retain the ability for regular (and sometimes rapid) production of collagen throughout their lifetime. This creates a conundrum: how can fibrils that are never renewed withstand millions of cycles of stress without suffering fatigue failure, and, in the absence of turnover, why do cells retain the ability to synthesise new collagen? This thesis has contributed to the discovery that there exists two pools of collagen in tendon, in which one pool (~90-95%) is permanent and the other is under the control of the circadian clock, turned over on a 24-hour rhythmic basis. However, this discovery has opened up new questions. Why does such an important and potentially long-lived protein need to be circadianly regulated? How is that regulation achieved? In this thesis I show how the cell achieves circadian regulation of collagen levels and discuss potential reasons and applications. In the first chapters, I built a mathematical model of the circadian clock regulation of the collagen secretory pathway. I then designed a biological tool to quantify collagen dynamics and test the model (among other potential applications). I created a predictive mathematical model for collagen regulation at a cellular level, allowing for better understanding and exploration of the ways this vital protein is maintained. The novel experimental tool I developed helps to refine this model and quantify protein levels across multiple scales and in real time using CRISPR-Cas9 and NanoLuciferase, with other potential uses in therapeutic drug screening. We measured accurately the number of collagen molecules in a cell consistently across platforms and scales, as well as quantifying at sub-cellular vesicle level. In the final part of the work described in this thesis, I developed a mathematical mechanical model for the stress response of tendon starting from the microstructure of the tendon as seen in electron microscopy images, incorporating the effects of the fluid in the extrafibrillar matrix. Using this I investigated the circadian differences observed in both the distribution of fibrils and mechanical response of the tissue. This tissue mechanics modelling illustrates the importance of including the extrafibrillar matrix in mechanical tissue modelling, as well as accounting for the specific topology of the tendon itself. This thesis is a step forward in our understanding in a number of areas. A predictive model of tendon mechanics based on tendon EM images and incorporating the contributions of the extrafibrillar matrix will more accurately explain the behaviour of this important tissue and its response to stresses. Further refinement of the collagen pathway model will lead to a better understanding of how the cells maintain such an important homeostatic mechanism. The NLuc-based, easy-to-use, reliable tool for protein quantification will have wide ranging benefits and uses, from sub-cellular dynamic resolution of protein trafficking to live quantitation of tissue level changes to protein amounts. The use of various mathematical modelling methods in this thesis has informed important unanswered biological questions related to collagen and the ECM and led to the development of a versatile quantitative tool.
- Published
- 2021
30. Structure and function of the ER-Membrane Complex
- Author
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Phillips, Ben and Miller, Elizabeth
- Subjects
572 ,Structural Biology ,Yeast Genetics ,Biochemistry ,Biology ,Membrane Proteins ,Membrane Biology - Abstract
The ER-Membrane Complex (EMC) is a highly conserved heterodecameric membrane protein complex, found in the Endoplasmic Reticulum (ER) across almost all branches of eukaryotic life. The EMC has been implicated in a wide range of processes including viral reproduction, inter-organelle phospholipid transfer, cholesterol biosynthesis and the biogenesis of multi-pass membrane proteins. Although the complex was formally identified nearly 10 years ago, almost all of the information available that informs a function for the complex comes from indirect high-throughput genetic screens. It was only in 2017 that the first mechanistic study demonstrated that the mammalian EMC can act as a membrane protein insertase for weakly hydrophobic tail-anchored (TA) proteins. Soon after, a second study revealed that the mammalian EMC is required for the determination of topology of the first transmembrane domain (TMD) of a range of G-Protein coupled receptors (GPCRs). In my PhD I set out to characterise the role of the yeast EMC in the biogenesis of a model misfolded membrane protein called Yor1ΔF. Yor1 is broadly homologous to the disease related CFTR transporter and Yor1ΔF replicates the misfolding found in the common disease causing CFTR allele CFTRΔF. Previous work in the Miller lab identified the EMC genes as essential for the biogenesis of Yor1ΔF and in this thesis I expand on that work to reveal that the loss of EMC function sensitises cells to expression of misfolding membrane proteins. By manipulating the emcΔ sensitised state I conclude that the misfolded protein is degraded co-translationally. I describe this co-translational degradation for the first time for a membrane protein and note that it represents the first observation of folding-driven co-translational quality control. I further demonstrate that this process likely utilises similar machinery and mechanisms to analogous cytoplasmic ribosome associated quality control (RQC). I show that this phenomenon can be re-capitulated by interfering with canonical membrane protein insertion machinery and thus is not specific to emc mutants. Thus I describe a novel form of folding-driven co-translational quality control at the ER: ER-RQC. Subsequent to identifying ER-RQC in S. cerevisiae I designed a flow-cytometry based assay to asses whether the role of the EMC is conserved in CFTR biogenesis. Through a variety of genetic and pharmacological manipulations I demonstrate that CFTRΔF is also dependent on the EMC for biogenesis. In order to further our mechanistic understanding of the EMC, and in light of recent developments in the biochemical study of the complex, I set out to solve the structure of the yeast EMC. Initial attempt to purify the yeast EMC were unsuccessful, but a revised approach and optimised purification strategy enabled purification of the human EMC. Structural characterisation via cryo-electron microscopy (cryo-EM) yielded a 6.7Å resolution map that revealed the overall architecture of the complex. The map reveals structural features that had not been previously predicted from sequence analysis and, through incorporation of bioinformatic constraints, it is possible to propose a plausible model for the function of the EMC in membrane protein biogenesis. An appendix includes a 3.5Å resolution cryo-EM map of the Rab GTP exchange factor TRAPPIII bound to its cognate Rab Ypt1. This map is from S. cerevisisae and was solved in collaboration with the Fromme lab at Cornell University (USA).
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- 2020
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31. A Sequence-Stratigraphic Perspective of the Late Ordovician Mass Extinction
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Zimmt, Joshua Ben
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Paleontology ,Geology ,Biology ,Biostratigraphy ,Chemostratigraphy ,Mass extinction ,Ordovician ,Sequence stratigraphy ,Stratigraphy - Abstract
Mass extinctions throughout the history of life are a remarkable source of information on the relationship between past changes to the Earth System and global biodiversity. To understand the dynamics of Earth System changes and their impact on biodiversity, investigations of the pattern and drivers of faunal turnover heavily rely on fossil occurrences from measured stratigraphic columns. Traditionally, a cluster of last occurrences in a stratigraphic column is interpreted as evidence of a pulse of extinction; however, application of the principles of sequence stratigraphy to the fossil record have demonstrated that the structure of the stratigraphic record is a primary control on the distribution of occurrences in the fossil record. Significantly, this stratigraphic control on fossil occurrences results in the predictable clustering of last occurrences at major sequence-stratigraphic surfaces. These stratigraphically generated clusters of last occurrences mask the underlying pattern of faunal turnover in the fossil record, and while this control on fossil occurrences has been documented, there are no tested methods that can distinguish stratigraphically generated clusters of last occurrences when studying mass extinctions.The Late Ordovician mass extinction during the Hirnantian Stage (445.2–443.1 Ma) offers a promising case study of the stratigraphic control on fossil occurrences and its impact on our understanding of the pattern and drivers of faunal turnover. In the fossil record, the Late Ordovician mass extinction commonly is expressed as two clusters of last occurrences of species. These clusters of last occurrences coincide with major sequence stratigraphic surfaces that represent large changes in glacio-eustatic sea level. While the two clusters of last occurrences attributed to the Late Ordovician mass extinction are often interpreted at face value as two pulses of extinction, their association with major stratigraphic surface merits a thorough reassessment of the Upper Ordovician fossil record from a sequence-stratigraphic perspective to evaluate this face-value reading of the fossil record. In this dissertation, I develop a framework that can be used to determine the underlying pattern, timing, and therefore drivers, of mass extinctions in the fossil record with the ultimate goal of applying this method to an empirical stratigraphic record to understand the Late Ordovician mass extinction. In Chapter 1, I introduce the reader to the field of stratigraphic paleobiology and its importance for studying the fossil record of mass extinction events. In Chapter 2, I use forward modelling of plausible Late Ordovician mass extinction scenarios in a hypothetical stratigraphic record to develop a methodology that can be used to deconvolve the biological and geological signatures of the fossil record and determine the underlying pattern of a mass extinction based on field-collected data. Critically, this method requires a well-resolved sequence stratigraphic framework to contextualize patterns of faunal turnover in the fossil record. In Chapters 3 and 4, I undertake the development of such a stratigraphic correlation framework for the exceptional Upper Ordovician stratigraphic record on Anticosti Island (Québec, Canada), which preserves one of the thickest Ordovician–Silurian boundary sections in the world. In Chapter 3, I describe a new, biostratigraphically relevant species of brachiopod, Hirnantia notiskuani, that constrains the age of the Ellis Bay Formation to the Hirnantian Stage. Using this biostratigraphic constraint, in Chapter 4, I combine sedimentological, geochemical, and stratigraphic data to develop a high-resolution sequence stratigraphic framework for Upper Ordovician strata on Anticosti Island that will enable the methodology developed in Chapter 2 to the fossil record. In Chapter 5, I conclude with remarks on each of the three chapters and outline a vision for future work in studying the Late Ordovician mass extinction on Anticosti Island.
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- 2023
32. Science Process Activities for the Introductory Biology Laboratory.
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Rhyne, Pamela J. and Golden, Ben R.
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Offers examples of activities and practical ideas for the instruction of process skills in a laboratory setting. Includes suggestions for the processes of observing, comparing, inferring, collecting data, organizing data, interpreting results, identifying variables, formulating hypotheses, experimenting, predicting, and model building. (ML)
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- 1986
33. Reproductive histology of the saddled seabream Oblada melanura in the southern Mediterranean Sea (Tunisian coast).
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Kalai, Saoussen, Khoufi, Widien, and Meriem, Sadok Ben
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FISHERIES ,SMALL-scale fisheries ,HISTOLOGY ,FISH feeds ,SEX ratio ,COASTS - Abstract
The saddle seabream, Oblada melanura, is an important species in Mediterranean coastal fisheries. The artisanal gillnet fishery on Tunisia's northern coast was sampled on a monthly basis between April 2015 and March 2016. The sex ratio varied by month throughout the year, with females dominating from November to December and equal sex ratios during the rest of the year. For both sexes, gonad maturity and gonadosomatic index (I
G ) indicated that spawning occurs from May to September. In terms of energy investment, fish feed throughout the year. During the spawning period (May to September), gonadal production (IG ) appears to be supported by liver reserves (IH ). These reserves came from external sources (i.e. food) in the period before spawning. During the spawning period, it was necessary for the fish to continue feeding in order to support their body development. Estimated lengths at 50% maturity were similar for females (L50 = 17.14 cm) and males (L50 = 17.01 cm). [ABSTRACT FROM AUTHOR]- Published
- 2024
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34. Introduction of the Capsules environment to support further growth of the SBGrid structural biology software collection.
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Herre, Carol, Ho, Alex, Eisenbraun, Ben, Vincent, James, Nicholson, Thomas, Boutsioukis, Giorgos, Meyer, Peter A., Ottaviano, Michelle, Krause, Kurt L., Key, Jason, and Sliz, Piotr
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APPLICATION software ,COMPUTER software ,CONSORTIA ,BIOLOGY ,RESEARCH personnel ,SYNTHETIC biology ,COMPUTER software reusability - Abstract
The expansive scientific software ecosystem, characterized by millions of titles across various platforms and formats, poses significant challenges in maintaining reproducibility and provenance in scientific research. The diversity of independently developed applications, evolving versions and heterogeneous components highlights the need for rigorous methodologies to navigate these complexities. In response to these challenges, the SBGrid team builds, installs and configures over 530 specialized software applications for use in the on‐premises and cloud‐based computing environments of SBGrid Consortium members. To address the intricacies of supporting this diverse application collection, the team has developed the Capsule Software Execution Environment, generally referred to as Capsules. Capsules rely on a collection of programmatically generated bash scripts that work together to isolate the runtime environment of one application from all other applications, thereby providing a transparent cross‐platform solution without requiring specialized tools or elevated account privileges for researchers. Capsules facilitate modular, secure software distribution while maintaining a centralized, conflict‐free environment. The SBGrid platform, which combines Capsules with the SBGrid collection of structural biology applications, aligns with FAIR goals by enhancing the findability, accessibility, interoperability and reusability of scientific software, ensuring seamless functionality across diverse computing environments. Its adaptability enables application beyond structural biology into other scientific fields. [ABSTRACT FROM AUTHOR]
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- 2024
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35. A pandemic recap: lessons we have learned
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Coccolini, Federico, Cicuttin, Enrico, Cremonini, Camilla, Tartaglia, Dario, Viaggi, Bruno, Kuriyama, Akira, Picetti, Edoardo, Ball, Chad, Abu-Zidan, Fikri, Ceresoli, Marco, Turri, Bruno, Jain, Sumita, Palombo, Carlo, Guirao, Xavier, Rodrigues, Gabriel, Gachabayov, Mahir, Machado, Fernando, Eftychios, Lostoridis, Kanj, Souha S., Di Carlo, Isidoro, Di Saverio, Salomone, Khokha, Vladimir, Kirkpatrick, Andrew, Massalou, Damien, Forfori, Francesco, Corradi, Francesco, Delibegovic, Samir, Machain Vega, Gustavo M., Fantoni, Massimo, Demetriades, Demetrios, Kapoor, Garima, Kluger, Yoram, Ansari, Shamshul, Maier, Ron, Leppaniemi, Ari, Hardcastle, Timothy, Vereczkei, Andras, Karamagioli, Evika, Pikoulis, Emmanouil, Pistello, Mauro, Sakakushev, Boris E., Navsaria, Pradeep H., Galeiras, Rita, Yahya, Ali I., Osipov, Aleksei V., Dimitrov, Evgeni, Doklestić, Krstina, Pisano, Michele, Malacarne, Paolo, Carcoforo, Paolo, Sibilla, Maria Grazia, Kryvoruchko, Igor A., Bonavina, Luigi, Kim, Jae Il, Shelat, Vishal G., Czepiel, Jacek, Maseda, Emilio, Marwah, Sanjay, Chirica, Mircea, Biancofiore, Giandomenico, Podda, Mauro, Cobianchi, Lorenzo, Ansaloni, Luca, Fugazzola, Paola, Seretis, Charalampos, Gomez, Carlos Augusto, Tumietto, Fabio, Malbrain, Manu, Reichert, Martin, Augustin, Goran, Amato, Bruno, Puzziello, Alessandro, Hecker, Andreas, Gemignani, Angelo, Isik, Arda, Cucchetti, Alessandro, Nacoti, Mirco, Kopelman, Doron, Mesina, Cristian, Ghannam, Wagih, Ben-Ishay, Offir, Dhingra, Sameer, Coimbra, Raul, Moore, Ernest E., Cui, Yunfeng, Quiodettis, Martha A., Bala, Miklosh, Testini, Mario, Diaz, Jose, Girardis, Massimo, Biffl, Walter L., Hecker, Matthias, Sall, Ibrahima, Boggi, Ugo, Materazzi, Gabriele, Ghiadoni, Lorenzo, Matsumoto, Junichi, Zuidema, Wietse P., Ivatury, Rao, Enani, Mushira A., Litvin, Andrey, Al-Hasan, Majdi N., Demetrashvili, Zaza, Baraket, Oussama, Ordoñez, Carlos A., Negoi, Ionut, Kiguba, Ronald, Memish, Ziad A., Elmangory, Mutasim M., Tolonen, Matti, Das, Korey, Ribeiro, Julival, O’Connor, Donal B., Tan, Boun Kim, Van Goor, Harry, Baral, Suman, De Simone, Belinda, Corbella, Davide, Brambillasca, Pietro, Scaglione, Michelangelo, Basolo, Fulvio, De’Angelis, Nicola, Bendinelli, Cino, Weber, Dieter, Pagani, Leonardo, Monti, Cinzia, Baiocchi, Gianluca, Chiarugi, Massimo, Catena, Fausto, and Sartelli, Massimo
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- 2021
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36. Debating Sexual Selection and Mating Strategies
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McNamara, John M., Wedell, Nina, Hosken, David J., Birkhead, Tim R., Colegrave, Nick, Harvey, Paul H., Hatchwell, Ben, Hunt, John, Moore, Allen J., Parker, Geoff A., Pitnick, Scott, Pizzari, Tommaso, Radwan, Jacek, Ritchie, Mike, Sheldon, Ben C., Shuker, David M., Simmons, Leigh W., Stockley, Paula, Tregenza, Tom, Zuk, Marlene, Pizzari, Tommaso, Blows, Mark W., Brooks, Rob, Buchanan, Katherine L., Clutton-Brock, Tim H., Jennions, Michael D., Kokko, Hanna, Kotiaho, Janne S., Macias-García, Constantino, Partridge, Linda, Snook, Rhonda R., Buss, David M., Day, Troy, Houle, David, Rowe, Locke, Ghiselin, Michael T., Hurd, Peter L., Miller, Geoffrey, Stewart, Jeffrey, Roughgarden, Joan, Akçay, Erol, and Oishi, Meeko
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- 2006
37. Differential and shared genetic effects on kidney function between diabetic and non-diabetic individuals
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Winkler, Thomas W., Rasheed, Humaira, Teumer, Alexander, Gorski, Mathias, Rowan, Bryce X., Stanzick, Kira J., Thomas, Laurent F., Tin, Adrienne, Hoppmann, Anselm, Chu, Audrey Y., Tayo, Bamidele, Thio, Chris H. L., Cusi, Daniele, Chai, Jin-Fang, Sieber, Karsten B., Horn, Katrin, Li, Man, Scholz, Markus, Cocca, Massimiliano, Wuttke, Matthias, van der Most, Peter J., Yang, Qiong, Ghasemi, Sahar, Nutile, Teresa, Li, Yong, Pontali, Giulia, Günther, Felix, Dehghan, Abbas, Correa, Adolfo, Parsa, Afshin, Feresin, Agnese, de Vries, Aiko P. J., Zonderman, Alan B., Smith, Albert V., Oldehinkel, Albertine J., De Grandi, Alessandro, Rosenkranz, Alexander R., Franke, Andre, Teren, Andrej, Metspalu, Andres, Hicks, Andrew A., Morris, Andrew P., Tönjes, Anke, Morgan, Anna, Podgornaia, Anna I., Peters, Annette, Körner, Antje, Mahajan, Anubha, Campbell, Archie, Freedman, Barry I., Spedicati, Beatrice, Ponte, Belen, Schöttker, Ben, Brumpton, Ben, Banas, Bernhard, Krämer, Bernhard K., Jung, Bettina, Åsvold, Bjørn Olav, Smith, Blair H., Ning, Boting, Penninx, Brenda W. J. H., Vanderwerff, Brett R., Psaty, Bruce M., Kammerer, Candace M., Langefeld, Carl D., Hayward, Caroline, Spracklen, Cassandra N., Robinson-Cohen, Cassianne, Hartman, Catharina A., Lindgren, Cecilia M., Wang, Chaolong, Sabanayagam, Charumathi, Heng, Chew-Kiat, Lanzani, Chiara, Khor, Chiea-Chuen, Cheng, Ching-Yu, Fuchsberger, Christian, Gieger, Christian, Shaffer, Christian M., Schulz, Christina-Alexandra, Willer, Cristen J., Chasman, Daniel I., Gudbjartsson, Daniel F., Ruggiero, Daniela, Toniolo, Daniela, Czamara, Darina, Porteous, David J., Waterworth, Dawn M., Mascalzoni, Deborah, Mook-Kanamori, Dennis O., Reilly, Dermot F., Daw, E. Warwick, Hofer, Edith, Boerwinkle, Eric, Salvi, Erika, Bottinger, Erwin P., Tai, E-Shyong, Catamo, Eulalia, Rizzi, Federica, Guo, Feng, Rivadeneira, Fernando, Guilianini, Franco, Sveinbjornsson, Gardar, Ehret, Georg, Waeber, Gerard, Biino, Ginevra, Girotto, Giorgia, Pistis, Giorgio, Nadkarni, Girish N., Delgado, Graciela E., Montgomery, Grant W., Snieder, Harold, Campbell, Harry, White, Harvey D., Gao, He, Stringham, Heather M., Schmidt, Helena, Li, Hengtong, Brenner, Hermann, Holm, Hilma, Kirsten, Holger, Kramer, Holly, Rudan, Igor, Nolte, Ilja M., Tzoulaki, Ioanna, Olafsson, Isleifur, Martins, Jade, Cook, James P., Wilson, James F., Halbritter, Jan, Felix, Janine F., Divers, Jasmin, Kooner, Jaspal S., Lee, Jeannette Jen-Mai, O’Connell, Jeffrey, Rotter, Jerome I., Liu, Jianjun, Xu, Jie, Thiery, Joachim, Ärnlöv, Johan, Kuusisto, Johanna, Jakobsdottir, Johanna, Tremblay, Johanne, Chambers, John C., Whitfield, John B., Gaziano, John M., Marten, Jonathan, Coresh, Josef, Jonas, Jost B., Mychaleckyj, Josyf C., Christensen, Kaare, Eckardt, Kai-Uwe, Mohlke, Karen L., Endlich, Karlhans, Dittrich, Katalin, Ryan, Kathleen A., Rice, Kenneth M., Taylor, Kent D., Ho, Kevin, Nikus, Kjell, Matsuda, Koichi, Strauch, Konstantin, Miliku, Kozeta, Hveem, Kristian, Lind, Lars, Wallentin, Lars, Yerges-Armstrong, Laura M., Raffield, Laura M., Phillips, Lawrence S., Launer, Lenore J., Lyytikäinen, Leo-Pekka, Lange, Leslie A., Citterio, Lorena, Klaric, Lucija, Ikram, M. Arfan, Ising, Marcus, Kleber, Marcus E., Francescatto, Margherita, Concas, Maria Pina, Ciullo, Marina, Piratsu, Mario, Orho-Melander, Marju, Laakso, Markku, Loeffler, Markus, Perola, Markus, de Borst, Martin H., Gögele, Martin, Bianca, Martina La, Lukas, Mary Ann, Feitosa, Mary F., Biggs, Mary L., Wojczynski, Mary K., Kavousi, Maryam, Kanai, Masahiro, Akiyama, Masato, Yasuda, Masayuki, Nauck, Matthias, Waldenberger, Melanie, Chee, Miao-Li, Chee, Miao-Ling, Boehnke, Michael, Preuss, Michael H., Stumvoll, Michael, Province, Michael A., Evans, Michele K., O’Donoghue, Michelle L., Kubo, Michiaki, Kähönen, Mika, Kastarinen, Mika, Nalls, Mike A., Kuokkanen, Mikko, Ghanbari, Mohsen, Bochud, Murielle, Josyula, Navya Shilpa, Martin, Nicholas G., Tan, Nicholas Y. Q., Palmer, Nicholette D., Pirastu, Nicola, Schupf, Nicole, Verweij, Niek, Hutri-Kähönen, Nina, Mononen, Nina, Bansal, Nisha, Devuyst, Olivier, Melander, Olle, Raitakari, Olli T., Polasek, Ozren, Manunta, Paolo, Gasparini, Paolo, Mishra, Pashupati P., Sulem, Patrick, Magnusson, Patrik K. E., Elliott, Paul, Ridker, Paul M., Hamet, Pavel, Svensson, Per O., Joshi, Peter K., Kovacs, Peter, Pramstaller, Peter P., Rossing, Peter, Vollenweider, Peter, van der Harst, Pim, Dorajoo, Rajkumar, Sim, Ralene Z. H., Burkhardt, Ralph, Tao, Ran, Noordam, Raymond, Mägi, Reedik, Schmidt, Reinhold, de Mutsert, Renée, Rueedi, Rico, van Dam, Rob M., Carroll, Robert J., Gansevoort, Ron T., Loos, Ruth J. F., Felicita, Sala Cinzia, Sedaghat, Sanaz, Padmanabhan, Sandosh, Freitag-Wolf, Sandra, Pendergrass, Sarah A., Graham, Sarah E., Gordon, Scott D., Hwang, Shih-Jen, Kerr, Shona M., Vaccargiu, Simona, Patil, Snehal B., Hallan, Stein, Bakker, Stephan J. L., Lim, Su-Chi, Lucae, Susanne, Vogelezang, Suzanne, Bergmann, Sven, Corre, Tanguy, Ahluwalia, Tarunveer S., Lehtimäki, Terho, Boutin, Thibaud S., Meitinger, Thomas, Wong, Tien-Yin, Bergler, Tobias, Rabelink, Ton J., Esko, Tõnu, Haller, Toomas, Thorsteinsdottir, Unnur, Völker, Uwe, Foo, Valencia Hui Xian, Salomaa, Veikko, Vitart, Veronique, Giedraitis, Vilmantas, Gudnason, Vilmundur, Jaddoe, Vincent W. V., Huang, Wei, Zhang, Weihua, Wei, Wen Bin, Kiess, Wieland, März, Winfried, Koenig, Wolfgang, Lieb, Wolfgang, Gao, Xin, Sim, Xueling, Wang, Ya Xing, Friedlander, Yechiel, Tham, Yih-Chung, Kamatani, Yoichiro, Okada, Yukinori, Milaneschi, Yuri, Yu, Zhi, Hung, Adriana M., Stark, Klaus J., Stefansson, Kari, Böger, Carsten A., Kronenberg, Florian, Köttgen, Anna, Pattaro, Cristian, Heid, Iris M., Psychiatry, APH - Mental Health, Amsterdam Neuroscience - Complex Trait Genetics, Amsterdam Neuroscience - Mood, Anxiety, Psychosis, Stress & Sleep, APH - Digital Health, University of Helsinki, CAMM - Research Program for Clinical and Molecular Metabolism, Faculty of Medicine, Research Programs Unit, Tampere University, Clinical Medicine, TAYS Heart Centre, Department of Clinical Chemistry, Department of Clinical Physiology and Nuclear Medicine, Internal Medicine, Pediatrics, Epidemiology, Radiology & Nuclear Medicine, Erasmus MC other, Home Office, Imperial College Healthcare NHS Trust- BRC Funding, Medical Research Council (MRC), UK DRI Ltd, Interdisciplinary Centre Psychopathology and Emotion regulation (ICPE), Life Course Epidemiology (LCE), Groningen Institute for Organ Transplantation (GIOT), Groningen Kidney Center (GKC), Cardiovascular Centre (CVC), Winkler, Thomas W, Rasheed, Humaira, Teumer, Alexander, Gorski, Mathia, Rowan, Bryce X, Stanzick, Kira J, Thomas, Laurent F, Tin, Adrienne, Hoppmann, Anselm, Chu, Audrey Y, Tayo, Bamidele, Thio, Chris H L, Cusi, Daniele, Chai, Jin-Fang, Sieber, Karsten B, Horn, Katrin, Li, Man, Scholz, Marku, Cocca, Massimiliano, Wuttke, Matthia, van der Most, Peter J, Yang, Qiong, Ghasemi, Sahar, Nutile, Teresa, Li, Yong, Pontali, Giulia, Günther, Felix, Dehghan, Abba, Correa, Adolfo, Parsa, Afshin, Feresin, Agnese, de Vries, Aiko P J, Zonderman, Alan B, Smith, Albert V, Oldehinkel, Albertine J, De Grandi, Alessandro, Rosenkranz, Alexander R, Franke, Andre, Teren, Andrej, Metspalu, Andre, Hicks, Andrew A, Morris, Andrew P, Tönjes, Anke, Morgan, Anna, Podgornaia, Anna I, Peters, Annette, Körner, Antje, Mahajan, Anubha, Campbell, Archie, Freedman, Barry I, Spedicati, Beatrice, Ponte, Belen, Schöttker, Ben, Brumpton, Ben, Banas, Bernhard, Krämer, Bernhard K, Jung, Bettina, Åsvold, Bjørn Olav, Smith, Blair H, Ning, Boting, Penninx, Brenda W J H, Vanderwerff, Brett R, Psaty, Bruce M, Kammerer, Candace M, Langefeld, Carl D, Hayward, Caroline, Spracklen, Cassandra N, Robinson-Cohen, Cassianne, Hartman, Catharina A, Lindgren, Cecilia M, Wang, Chaolong, Sabanayagam, Charumathi, Heng, Chew-Kiat, Lanzani, Chiara, Khor, Chiea-Chuen, Cheng, Ching-Yu, Fuchsberger, Christian, Gieger, Christian, Shaffer, Christian M, Schulz, Christina-Alexandra, Willer, Cristen J, Chasman, Daniel I, Gudbjartsson, Daniel F, Ruggiero, Daniela, Toniolo, Daniela, Czamara, Darina, Porteous, David J, Waterworth, Dawn M, Mascalzoni, Deborah, Mook-Kanamori, Dennis O, Reilly, Dermot F, Daw, E Warwick, Hofer, Edith, Boerwinkle, Eric, Salvi, Erika, Bottinger, Erwin P, Tai, E-Shyong, Catamo, Eulalia, Rizzi, Federica, Guo, Feng, Rivadeneira, Fernando, Guilianini, Franco, Sveinbjornsson, Gardar, Ehret, Georg, Waeber, Gerard, Biino, Ginevra, Girotto, Giorgia, Pistis, Giorgio, Nadkarni, Girish N, Delgado, Graciela E, Montgomery, Grant W, Snieder, Harold, Campbell, Harry, White, Harvey D, Gao, He, Stringham, Heather M, Schmidt, Helena, Li, Hengtong, Brenner, Hermann, Holm, Hilma, Kirsten, Holgen, Kramer, Holly, Rudan, Igor, Nolte, Ilja M, Tzoulaki, Ioanna, Olafsson, Isleifur, Martins, Jade, Cook, James P, Wilson, James F, Halbritter, Jan, Felix, Janine F, Divers, Jasmin, Kooner, Jaspal S, Lee, Jeannette Jen-Mai, O'Connell, Jeffrey, Rotter, Jerome I, Liu, Jianjun, Xu, Jie, Thiery, Joachim, Ärnlöv, Johan, Kuusisto, Johanna, Jakobsdottir, Johanna, Tremblay, Johanne, Chambers, John C, Whitfield, John B, Gaziano, John M, Marten, Jonathan, Coresh, Josef, Jonas, Jost B, Mychaleckyj, Josyf C, Christensen, Kaare, Eckardt, Kai-Uwe, Mohlke, Karen L, Endlich, Karlhan, Dittrich, Katalin, Ryan, Kathleen A, Rice, Kenneth M, Taylor, Kent D, Ho, Kevin, Nikus, Kjell, Matsuda, Koichi, Strauch, Konstantin, Miliku, Kozeta, Hveem, Kristian, Lind, Lar, Wallentin, Lar, Yerges-Armstrong, Laura M, Raffield, Laura M, Phillips, Lawrence S, Launer, Lenore J, Lyytikäinen, Leo-Pekka, Lange, Leslie A, Citterio, Lorena, Klaric, Lucija, Ikram, M Arfan, Ising, Marcu, Kleber, Marcus E, Francescatto, Margherita, Concas, Maria Pina, Ciullo, Marina, Piratsu, Mario, Orho-Melander, Marju, Laakso, Markku, Loeffler, Marku, Perola, Marku, de Borst, Martin H, Gögele, Martin, Bianca, Martina La, Lukas, Mary Ann, Feitosa, Mary F, Biggs, Mary L, Wojczynski, Mary K, Kavousi, Maryam, Kanai, Masahiro, Akiyama, Masato, Yasuda, Masayuki, Nauck, Matthia, Waldenberger, Melanie, Chee, Miao-Li, Chee, Miao-Ling, Boehnke, Michael, Preuss, Michael H, Stumvoll, Michael, Province, Michael A, Evans, Michele K, O'Donoghue, Michelle L, Kubo, Michiaki, Kähönen, Mika, Kastarinen, Mika, Nalls, Mike A, Kuokkanen, Mikko, Ghanbari, Mohsen, Bochud, Murielle, Josyula, Navya Shilpa, Martin, Nicholas G, Tan, Nicholas Y Q, Palmer, Nicholette D, Pirastu, Nicola, Schupf, Nicole, Verweij, Niek, Hutri-Kähönen, Nina, Mononen, Nina, Bansal, Nisha, Devuyst, Olivier, Melander, Olle, Raitakari, Olli T, Polasek, Ozren, Manunta, Paolo, Gasparini, Paolo, Mishra, Pashupati P, Sulem, Patrick, Magnusson, Patrik K E, Elliott, Paul, Ridker, Paul M, Hamet, Pavel, Svensson, Per O, Joshi, Peter K, Kovacs, Peter, Pramstaller, Peter P, Rossing, Peter, Vollenweider, Peter, van der Harst, Pim, Dorajoo, Rajkumar, Sim, Ralene Z H, Burkhardt, Ralph, Tao, Ran, Noordam, Raymond, Mägi, Reedik, Schmidt, Reinhold, de Mutsert, Renée, Rueedi, Rico, van Dam, Rob M, Carroll, Robert J, Gansevoort, Ron T, Loos, Ruth J F, Felicita, Sala Cinzia, Sedaghat, Sanaz, Padmanabhan, Sandosh, Freitag-Wolf, Sandra, Pendergrass, Sarah A, Graham, Sarah E, Gordon, Scott D, Hwang, Shih-Jen, Kerr, Shona M, Vaccargiu, Simona, Patil, Snehal B, Hallan, Stein, Bakker, Stephan J L, Lim, Su-Chi, Lucae, Susanne, Vogelezang, Suzanne, Bergmann, Sven, Corre, Tanguy, Ahluwalia, Tarunveer S, Lehtimäki, Terho, Boutin, Thibaud S, Meitinger, Thoma, Wong, Tien-Yin, Bergler, Tobia, Rabelink, Ton J, Esko, Tõnu, Haller, Tooma, Thorsteinsdottir, Unnur, Völker, Uwe, Foo, Valencia Hui Xian, Salomaa, Veikko, Vitart, Veronique, Giedraitis, Vilmanta, Gudnason, Vilmundur, Jaddoe, Vincent W V, Huang, Wei, Zhang, Weihua, Wei, Wen Bin, Kiess, Wieland, März, Winfried, Koenig, Wolfgang, Lieb, Wolfgang, Gao, Xin, Sim, Xueling, Wang, Ya Xing, Friedlander, Yechiel, Tham, Yih-Chung, Kamatani, Yoichiro, Okada, Yukinori, Milaneschi, Yuri, Yu, Zhi, Stark, Klaus J, Stefansson, Kari, Böger, Carsten A, Hung, Adriana M, Kronenberg, Florian, Köttgen, Anna, Pattaro, Cristian, Heid, Iris M, and Lee Kong Chian School of Medicine (LKCMedicine)
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Life Sciences & Biomedicine - Other Topics ,EXPRESSION ,Diabetic Nephropathies/genetics ,610 Medizin ,LOCI ,Medicine (miscellaneous) ,EFFICIENT ,Lifelines cohort study ,Kidney ,General Biochemistry, Genetics and Molecular Biology ,DISEASE ,QUALITY-CONTROL ,SDG 3 - Good Health and Well-being ,Diabetic Nephropathy ,Diabetes Mellitus ,Humans ,Medicine [Science] ,Diabetic Nephropathies ,GENOME-WIDE ASSOCIATION ,Biology ,DiscovEHR/MyCode study ,METAANALYSIS ,Glomerular Filtration Rate/genetics ,Medicinsk genetik ,ddc:610 ,Science & Technology ,genetic ,effects ,kidney ,diabetic ,JOINT ,Klinisk medicin ,Diabetes Mellitu ,3126 Surgery, anesthesiology, intensive care, radiology ,Multidisciplinary Sciences ,ENVIRONMENT INTERACTION ,Creatinine ,VA Million Veteran Program ,Science & Technology - Other Topics ,3111 Biomedicine ,Clinical Medicine ,SMOKING ,General Agricultural and Biological Sciences ,Life Sciences & Biomedicine ,Medical Genetics ,Human ,Genome-Wide Association Study ,Glomerular Filtration Rate - Abstract
Reduced glomerular filtration rate (GFR) can progress to kidney failure. Risk factors include genetics and diabetes mellitus (DM), but little is known about their interaction. We conducted genome-wide association meta-analyses for estimated GFR based on serum creatinine (eGFR), separately for individuals with or without DM (nDM = 178,691, nnoDM = 1,296,113). Our genome-wide searches identified (i) seven eGFR loci with significant DM/noDM-difference, (ii) four additional novel loci with suggestive difference and (iii) 28 further novel loci (including CUBN) by allowing for potential difference. GWAS on eGFR among DM individuals identified 2 known and 27 potentially responsible loci for diabetic kidney disease. Gene prioritization highlighted 18 genes that may inform reno-protective drug development. We highlight the existence of DM-only and noDM-only effects, which can inform about the target group, if respective genes are advanced as drug targets. Largely shared effects suggest that most drug interventions to alter eGFR should be effective in DM and noDM. Published version The Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) supported the meta-analysis—Project-ID 387509280—SFB1350 (Subproject C6 to I.M.H.). A.M.H., B.R., and R.T. were supported by VACSR&D MVP grant CX001897. This research is based on data from the Million Veteran Program, Office of Research and Development, Veterans Health Administration, and was supported by VACSR&D MVP grant CX001897 (A.M.H.). This publication does not represent the views of the Department of Veteran Affairs or the United States Government. We conducted this research using the UK Biobank resource under the application number 20272.
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- 2022
38. Stakeholder perspectives on farmers' resistance towards urban land-use changes in Bahir Dar, Ethiopia
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Melaku Bogale Fitawok, Ben Derudder, Amare Sewnet Minale, Steven Van Passel, Enyew Adgo, and Jan Nyssen
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farmers' resistance ,Science & Technology ,livelihood ,Ecology ,urban fringes ,ACQUISITION ,IMPACT ,Geography, Planning and Development ,Agriculture ,Environmental Sciences & Ecology ,POLICIES ,Management, Monitoring, Policy and Law ,CHINA ,Chemistry ,Agriculture, Multidisciplinary ,COMPENSATION ,PRAXIS ,SIMULATION ,Expropriation ,monetary compensation ,INFORMAL SETTLEMENTS ,Biology ,Life Sciences & Biomedicine ,Earth-Surface Processes ,CONFLICT - Abstract
Owing to growing uncontrolled land-use change and urban expansion, farmers in urban fringes are struggling to sustain their livelihood. Farmers have been expressing their dissatisfaction at different times. This study analyzes the stakeholders' perspectives on the causes and outcomes of farmers' resistance to land-use change and urban expansion processes by zooming in on Bahir Dar, Ethiopia. The paper is based on focus group discussions with farmers in the neighboring villages, local agricultural extension experts, and, subsequently, key informant interviews of local government officials. Juxtaposing farmers' and local experts' positions reveals that inadequate compensations during land expropriation, lack of good governance in the urban expansion process, and inaccessibility of infrastructures are primary reasons for the farmers' struggle against urban expansion in the urban fringes. This study provides insights into the consequences of unplanned urban development challenges and may inform research and policymaking on sustainable urban development in the area and beyond.
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- 2023
39. Fossil evidence for the ancient link between clonal fragmentation, six-fold symmetry and an epizoic lifestyle in asterozoan echinoderms.
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Thuy, Ben, Numberger-Thuy, Lea D., Härer, Jürgen, Kroh, Andreas, Winkler, Viola, and Schweigert, Günter
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ASEXUAL reproduction , *ECHINODERMATA , *MORPHOLOGY , *FOSSILS , *BIOLOGY - Abstract
Asexual reproduction by means of splitting, also called fissiparity, is a common feature in some asterozoan groups, especially in ophiactid brittle stars. Most fissiparous brittle stars show six instead of the usual five rays, live as epibionts on host organisms, and use clonal fragmentation to rapidly colonize secluded habitats and effectively expand the margins of their distribution area. While the biology and ecology of clonal fragmentation are comparatively well understood, virtually nothing is known about the evolution and geological history of that phenomenon. Here, we describe an exceptional fossil of an articulated six-armed brittle star from the Late Jurassic of Germany, showing one body half in the process of regeneration, and assign it to the new species Ophiactis hex sp. nov. Phylogenetic inference shows that the fossil represents the oldest member of the extant family Ophiactidae. Because the Ophiactis hex specimen shows an original six-fold symmetry combined with a morphology typically found in epizoic ophiuroids, in line with recent fissiparous ophiactid relatives, we assume that the regenerating body half is an indication for fissiparity. Ophiactis hex thus shows that fissiparity was established as a means of asexual reproduction in asterozoan echinoderms by the Late Jurassic. [ABSTRACT FROM AUTHOR]
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- 2024
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40. A narrative review of norovirus epidemiology, biology, and challenges to vaccine development.
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Carlson, Katherine B., Dilley, Anne, O'Grady, Thomas, Johnson, Jordan A., Lopman, Ben, and Viscidi, Emma
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VACCINE development ,NOROVIRUSES ,LONG-term care facilities ,BIOLOGY ,ECONOMIC aspects of diseases ,SYNTHETIC biology - Abstract
Norovirus is a leading cause of acute gastroenteritis (AGE) globally. AGE resulting from norovirus causes significant morbidity and mortality in countries of all income levels, particularly among young children and older adults. Prevention of norovirus AGE represents a unique challenge as the virus is genetically diverse with multiple genogroups and genotypes cocirculating globally and causing disease in humans. Variants of the GII.4 genotype are typically the most common genotype, and other genotypes cause varying amounts of disease year-to-year, with GII.2, GII.3, and GII.6 most prevalent in recent years. Noroviruses are primarily transmitted via the fecal-oral route and only a very small number of virions are required for infection, which makes outbreaks of norovirus extremely difficult to control when they occur. Settings like long-term care facilities, daycares, and hospitals are at high risk of outbreaks and can have very high attack rates resulting in substantial costs and disease burden. Severe cases of norovirus AGE are most common in vulnerable patient populations, such as infants, the elderly, and immunocompromised individuals, with available treatments limited to rehydration therapies and supportive care. To date, there are no FDA-approved norovirus vaccines; however, several candidates are currently in development. Given the substantial human and economic burden associated with norovirus AGE, a vaccine to prevent morbidity and mortality and protect vulnerable populations could have a significant impact on global public health. [ABSTRACT FROM AUTHOR]
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- 2024
- Full Text
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41. Association between ACTN3 R577X genotype and risk of non-contact injury in trained athletes: A systematic review
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Juan Del Coso, Hassane Zouhal, Guillaume Ravé, Claire Tourny, Abderraouf Ben Abderrahman, Benjamin Barthélémy, Nidhal Jebabli, Cain C T Clark, Anthony C. Hackney, Ayyappan Jayavel, Laboratoire Mouvement Sport Santé (M2S), École normale supérieure - Cachan (ENS Cachan)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Université de Brest (UBO)-Université de Rennes 2 (UR2), Université de Rennes (UNIV-RENNES)-Structure Fédérative de Recherche en Biologie et Santé de Rennes ( Biosit : Biologie - Santé - Innovation Technologique ), Universidad Rey Juan Carlos [Madrid] (URJC), SRM Institute of Science and Technology (SRM), Centre d’études des transformations des activités physiques et sportives (CETAPS), Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Normandie Université (NU)-Institut de Recherche Interdisciplinaire Homme et Société (IRIHS), Normandie Université (NU)-Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU), Toulouse Football Club, ISSEP Ksar Saïd, Université de la Manouba [Tunisie] (UMA), Coventry University, University of North Carolina [Chapel Hill] (UNC), University of North Carolina System (UNC), and Université de Rennes (UR)-École normale supérieure - Rennes (ENS Rennes)-Université de Brest (UBO)-Université de Rennes 2 (UR2)-Structure Fédérative de Recherche en Biologie et Santé de Rennes ( Biosit : Biologie - Santé - Innovation Technologique )
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medicine.medical_specialty ,[SDV]Life Sciences [q-bio] ,Physical Therapy, Sports Therapy and Rehabilitation ,Single-nucleotide polymorphism ,Athletic performance ,03 medical and health sciences ,0302 clinical medicine ,Polymorphism (computer science) ,Internal medicine ,Epidemiology ,Genotype ,medicine ,Muscle injury ,Orthopedics and Sports Medicine ,Exercise-related injury ,Association (psychology) ,α-actinin-3 deficiency ,030304 developmental biology ,0303 health sciences ,biology ,business.industry ,Athletes ,030229 sport sciences ,biology.organism_classification ,Single nucleotide polymorphism ,medicine.anatomical_structure ,Ankle ,business ,XX Genotype - Abstract
Background The aim of this study was to review, systematically, evidence concerning the link between the ACTN3 R577X polymorphism and the rates and severity of non-contact injuries and exercise-induced muscle damage in athletes and individuals enrolled in exercise training programs. Methods A computerized literature search was performed in the electronic databases PubMed, Web of Science, and SPORTDiscus, from inception until November 2020. All included studies compared the epidemiological characteristics of non-contact injury between the different genotypes of the ACTN3 R577X polymorphism. Results Our search identified 492 records. After the screening of titles, abstracts, and full texts, 13 studies examining the association between the ACTN3 genotypes and the rate and severity of non-contact injury were included in the analysis. These studies were performed in 6 different countries (Spain, Japan, Brazil, China, Republic of Korea, and Italy) and involved a total participant pool of 1093 participants. Of the studies, 2 studies involved only women, 5 studies involved only men, and 6 studies involved both men and women. All the studies included were classified as high-quality studies (≥6 points in the Physiotherapy Evidence Database (PEDro) scale score). Overall, evidence suggests there is an association between the ACTN3 R577X genotype and non-contact injury in 12 investigations. Six studies observed a significant association between ACTN3 R577X polymorphism and exercise induced muscle damage: two with non-contact ankle injury, three with non-contact muscle injury, and one with overall non-contact injury. Conclusion The present findings support the premise that possessing the ACTN3 XX genotype may predispose athletes to a higher probability of some non-contact injuries, such as muscle injury, ankle sprains, and higher levels of exercise-induced muscle damage.
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- 2023
42. Methylation of histone H3 lysine 4 is required for maintenance of beta cell function in adult mice
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Aline Daniel, Cassandra L. McDonald, Brad G. Hoffman, Nina Maeshima, Dan S. Luciani, Ben Vanderkruk, Daniel J. Pasula, Meilin An, and Priya Suresh
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Methyltransferase ,biology ,Chemistry ,Endocrinology, Diabetes and Metabolism ,Promoter ,Chromatin ,Cell biology ,Histone ,Gene expression ,biology.protein ,Internal Medicine ,Gene silencing ,H3K4me3 ,Epigenetics - Abstract
Aims/hypothesis Beta cells control glucose homeostasis via regulated production and secretion of insulin. This function arises from a highly specialised gene expression programme that is established during development and then sustained, with limited flexibility, in terminally differentiated cells. Dysregulation of this programme is seen in type 2 diabetes but mechanisms that preserve gene expression or underlie its dysregulation in mature cells are not well resolved. This study investigated whether methylation of histone H3 lysine 4 (H3K4), a marker of gene promoters with unresolved functional importance, is necessary for the maintenance of mature beta cell function. Methods Beta cell function, gene expression and chromatin modifications were analysed in conditional Dpy30 knockout mice, in which H3K4 methyltransferase activity is impaired, and in a mouse model of diabetes. Results H3K4 methylation maintains expression of genes that are important for insulin biosynthesis and glucose responsiveness. Deficient methylation of H3K4 leads to a less active and more repressed epigenome profile that locally correlates with gene expression deficits but does not globally reduce gene expression. Instead, developmentally regulated genes and genes in weakly active or suppressed states particularly rely on H3K4 methylation. We further show that H3K4 trimethylation (H3K4me3) is reorganised in islets from the Leprdb/db mouse model of diabetes in favour of weakly active and disallowed genes at the expense of terminal beta cell markers with broad H3K4me3 peaks. Conclusions/interpretation Sustained methylation of H3K4 is critical for the maintenance of beta cell function. Redistribution of H3K4me3 is linked to gene expression changes that are implicated in diabetes pathology. Graphical abstract
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- 2023
43. The Challenges of Integrating Oxidative Stress into Life-history Biology
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Isaksson, Caroline, Sheldon, Ben C., and Uller, Tobias
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- 2011
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44. Non-pharmaceutical interventions and the emergence of pathogen variants
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Robin N Thompson and Ben Ashby
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Genetics ,Coronavirus disease 2019 (COVID-19) ,Health, Toxicology and Mutagenesis ,immune escape ,social distancing ,Psychological intervention ,pathogen evolution ,Medicine (miscellaneous) ,Cross immunity ,Biology ,Affect (psychology) ,SDG 3 - Good Health and Well-being ,lockdowns ,Viral evolution ,Mutation (genetic algorithm) ,Pandemic ,transmissibillity ,cross-immunity ,Pathogen ,Ecology, Evolution, Behavior and Systematics - Abstract
AO_SCPLOWBSTRACTC_SCPLOWNon-pharmaceutical interventions (NPIs), such as social distancing and contact tracing, have been widely implemented during the COVID-19 pandemic. In addition to playing an important role in suppressing transmission, NPIs influence pathogen evolution by mediating mutation supply and altering the strength of selection for novel variants. However, it is unclear how NPIs might affect the emergence of novel variants of concern that are able to escape pre-existing immunity (partially or fully), are more transmissible, or cause greater mortality. Here, we analyse a stochastic two-strain epidemiological model to determine how the strength of NPIs affects the emergence of variants with similar or contrasting life-history characteristics to the wildtype. We show that, while stronger and timelier NPIs generally reduce the likelihood of variant emergence, it is possible for more transmissible variants with high cross immunity to have a greater probability of emerging at intermediate levels of NPIs. However, since one cannot predict the characteristics of a variant, the best strategy to prevent emergence is likely to be implementation of strong, timely NPIs. AO_SCPLOWUTHORC_SCPLOWO_SCPCAP C_SCPCAPO_SCPLOWSUMMARYC_SCPLOWDuring the COVID-19 pandemic, a wide range of non-pharmaceutical interventions, including mask wearing, quarantine, isolation, and lockdowns, have been used by governments around the world to suppress virus transmission. Although considerable efforts have been made to understand how such interventions affect transmission, much less attention has been paid to their effects on pathogen evolution. While vaccines are well-known to affect virus evolution, non-pharmaceutical interventions also influence mutation supply and the strength of selection, and hence play a key role in the emergence of novel variants. Here, we use a relatively simple mathematical model to explore how non-pharmaceutical interventions during an epidemic affect the emergence of a novel variant of a pathogen. We show that in general, it is important to implement effective transmission-reducing public health measures in a timely manner to prevent the emergence of novel variants, which may be more transmissible, more deadly, or able to escape immunity.
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- 2022
45. Quantitative Bioscience for the 21st Century
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HASTINGS, ALAN, ARZBERGER, PETER, BOLKER, BEN, COLLINS, SCOTT, IVES, ANTHONY R., JOHNSON, NORMAN A., and PALMER, MARGARET A.
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- 2005
- Full Text
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46. A Fungal Analog for Newfoundland Ediacaran Fossils?
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Peterson, Kevin J., Waggoner, Ben, and Hagadorn, James W.
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- 2003
47. Insights on mauritiana-like elements diversity in Mayetiola destructor and M. hordei (Diptera: Cecidomyiidae)
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Wiem Ben Amara, Salma Djebbi, Maha Mezghani, Chahnez Naccache, and Wafa Ben Lazhar-Ajroud
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Transposable element ,Subfamily ,biology ,In silico ,General Medicine ,biology.organism_classification ,Genome ,Cecidomyiidae ,Evolutionary biology ,Genetics ,Destructor ,Molecular Biology ,Mauritiana ,Mayetiola destructor ,Biotechnology - Abstract
Mariner-like elements (MLEs) are class II transposons belonging to the Tc1-mariner family that have successfully invaded many insect genomes. In the current study, the availability of the Hessian fly, Mayetiola destructor, genome has enabled us to perform in silico analysis of MLEs using a previously described mariner element (Desmar1) belonging to the mauritiana subfamily. Eighteen mauritiana-like elements were detected and clustered into three main groups: Desmar1-like, MauCons1, and MauCons2. Subsequently, in vitro analysis was carried out to investigate mauritiana-like elements in M. destructor as well as in Mayetiola hordei using primers designed from TIRs of previously identified MLEs. PCR amplifications were successful, and a total of 12 and 17 mauritiana-like elements were detected in M. destructor and M. hordei, respectively. Sequence analyses of mauritiana-like elements obtained in silico and in vitro have shown that MauCons1 and MauCons2 elements share low similarity with Desmar1 ranging from 50% to 55%, suggesting that different groups under the mauritiana subfamily have invaded the genomes of M. destructor and M. hordei. These groups were likely inherited by vertical transmission, which subsequently underwent different evolutionary histories. This work describes new mauritiana-like elements in M. destructor that are distinct from the previously discovered Desmar1 and provides the first evidence of MLEs belonging to the mauritiana subfamily in M. hordei.
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- 2022
48. Design and Synthesis of Visible-Light-Responsive Azobenzene Building Blocks for Chemical Biology
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Volarić, Jana, Buter, Jeffrey, Schulte, Albert M., Van Den Berg, Keimpe-Oeds, Santamaría-Aranda, Eduardo, Szymanski, Wiktor, Feringa, Ben L., 0000-0002-6198-6737, 0000-0002-4440-6702, 0000-0001-9948-6132, 0000-0002-9754-9248, 0000-0003-0588-8435, Synthetic Organic Chemistry, and Basic and Translational Research and Imaging Methodology Development in Groningen (BRIDGE)
- Subjects
Organic Chemistry ,Trehalose ,Water ,Photochemical Processes ,Azo Compounds ,Biology - Abstract
Tetra-ortho-fluoro-azobenzenes are a class of photoswitches useful for the construction of visible-light-controlled molecular systems. They can be used to achieve spatio-temporal control over the properties of a chosen bioactive molecule. However, the introduction of different substituents to the tetra-fluoro-azobenzene core can significantly affect the photochemical properties of the switch and compromise biocompatibility. Herein, we explored the effect of useful substituents, such as functionalization points, attachment handles, and water-solubilizing groups, on the photochemical properties of this photochromic system. In general, all the tested fluorinated azobenzenes exhibited favorable photochemical properties, such as high photostationary state distribution and long half-lives, both in organic solvents and in water. One of the azobenzene building blocks was functionalized with a trehalose group to enable the uptake of the photoswitch into mycobacteria. Following metabolic uptake and incorporation of the trehalose-based azobenzene in the mycobacterial cell wall, we demonstrated photoswitching of the azobenzene in the isolated total lipid extract.
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- 2022
49. Imaging Transcriptomics of Brain Disorders
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Aurina Arnatkeviciute, Alex Fornito, Ben D. Fulcher, and Mark A. Bellgrove
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Transcriptome ,Neuroimaging ,Neurodegeneration ,medicine ,Connectome ,Brain Structure and Function ,General Medicine ,Disease ,Biology ,medicine.disease ,Phenotype ,Neuroscience ,Gene - Abstract
Noninvasive neuroimaging is a powerful tool for quantifying diverse aspects of brain structure and function in vivo, and it has been used extensively to map the neural changes associated with various brain disorders. However, most neuroimaging techniques offer only indirect measures of underlying pathological mechanisms. The recent development of anatomically comprehensive gene expression atlases has opened new opportunities for studying the transcriptional correlates of noninvasively measured neural phenotypes, offering a rich framework for evaluating pathophysiological hypotheses and putative mechanisms. Here, we provide an overview of some fundamental methods in imaging transcriptomics and outline their application to understanding brain disorders of neurodevelopment, adulthood, and neurodegeneration. Converging evidence indicates that spatial variations in gene expression are linked to normative changes in brain structure during age-related maturation and neurodegeneration that are in part associated with cell-specific gene expression markers of gene expression. Transcriptional correlates of disorder-related neuroimaging phenotypes are also linked to transcriptionally dysregulated genes identified in ex vivo analyses of patient brains. Modeling studies demonstrate that spatial patterns of gene expression are involved in regional vulnerability to neurodegeneration and the spread of disease across the brain. This growing body of work supports the utility of transcriptional atlases in testing hypotheses about the molecular mechanism driving disease-related changes in macroscopic neuroimaging phenotypes.
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- 2022
50. Assessment of Rhamnus alaternus Leaves Extract: Phytochemical Characterization and Antimelanoma Activity
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Mounira Krifa, Mouna Maatouk, Ines Bouhlel Chatti, Leila Chekir Ghedira, Yosr Krichen, and Imene Ben Toumia
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0301 basic medicine ,030109 nutrition & dietetics ,Nutrition and Dietetics ,biology ,Traditional medicine ,Medicine (miscellaneous) ,Depurative ,biology.organism_classification ,03 medical and health sciences ,0302 clinical medicine ,Rhamnus alaternus ,Phytochemical ,030220 oncology & carcinogenesis ,Rhamnaceae ,Wound healing assay - Abstract
Rhamnus alaternus (Rhamnaceae) has been used as a laxative, purgative, diuretic, antihypertensive, and depurative. However, few scientific research studies on its antimelanoma activity have been re...
- Published
- 2022
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