WorldWideScience

Sample records for methods additionally k-12

  1. A Mixed-Method Approach on Digital Educational Games for K12: Gender, Attitudes and Performance

    Science.gov (United States)

    Law, Effie Lai-Chong; Gamble, Tim; Schwarz, Daniel; Kickmeier-Rust, Michael D.; Holzinger, Andreas

    Research on the influence of gender on attitudes towards and performance in digital educational games (DEGs) has quite a long history. Generally, males tend to play such games more engagingly than females, consequently attitude and performance of males using DEGs should be presumably higher than that of females. This paper reports an investigation of a DEG, which was developed to enhance the acquisition of geographical knowledge, carried out on British, German and Austrian K12 students aged between 11 and 14. Methods include a survey on initial design concepts, user tests on the system and two single-gender focus groups. Gender and cultural differences in gameplay habit, game type preferences and game character perceptions were observed. The results showed that both genders similarly improved their geographical knowledge, although boys tended to have a higher level of positive user experience than the girls. The qualitative data from the focus groups illustrated some interesting gender differences in perceiving various aspects of the game.

  2. Mixed Methods Evaluation of Statewide Implementation of Mathematics Education Technology for K-12 Students

    Science.gov (United States)

    Brasiel, Sarah; Martin, Taylor; Jeong, Soojeong; Yuan, Min

    2016-01-01

    An extensive body of research has demonstrated that the use in a K-12 classroom of technology, such as the Internet, computers, and software programs, enhances the learning of mathematics (Cheung & Slavin, 2013; Cohen & Hollebrands, 2011). In particular, growing empirical evidence supports that certain types of technology, such as…

  3. NGSS-Aligned, K-12 Climate Science Curricula, taught with citizen science and teacher-led inquiry methods

    Science.gov (United States)

    Zainfeld, S.

    2017-12-01

    Teacher-led inquiry into student learning is a promising method of formative assessment to gain insight into student achievement. NGSS-aligned K-12 Climate Science curricula taught with citizen science and teacher-led inquiry methods are described, along with results from a scientist-teacher collaboration survey.

  4. Addition of granulosa cell mass to the culture medium of oocytes derived from early antral follicles increases oocyte growth, ATP content, and acetylation of H4K12.

    Science.gov (United States)

    Sugiyama, Miyako; Sumiya, Mei; Shirasuna, Koumei; Kuwayama, Takehito; Iwata, Hisataka

    2016-12-01

    The main aim of the present study was to examine the hypothesis that an increase in the number of granulosa cells surrounding developing bovine oocytes results in both high ATP levels and an increase in the acetylation level of H4K12 in oocytes grown in vitro. Oocyte-granulosa cell complexes (OGCs) were collected from early antral follicles (EAFs, 0.4-0.7 mm in diameter), and individually cultured on 96-well plates with or without additional granulosa cell mass that had been prepared from other OGCs. After 16 days of culture, we examined: (i) the rate of antrum formation of the OGCs; (ii) the diameter, maturation, and fertilization rate of the oocytes; and (iii) the ATP content and acetylation level of H4K12 in the oocytes grown in vitro. Granulosa cell mass added to the culture medium contributed to the development of OGCs with a higher rate of antrum formation and oocyte growth. Furthermore, the addition of granulosa cells increased the ATP content and acetylation level of H4K12 in oocytes grown in vitro compared with those developed without addition of granulosa cells. In addition, there was a positive correlation between the ATP content in oocytes grown in vitro and the number of granulosa cells in the corresponding OGCs. The results suggest that granulosa cells play a role not only in the development of OGCs and the growth of oocytes, but also in the determination of ATP content and the acetylation of H4K12 in the oocytes developed in vitro.

  5. K-12 Education

    Science.gov (United States)

    products laboratories publications nisee b.i.p. members education FAQs links education Education Program Internships K-12 Education Contact the PEER Education Program PEER's Educational Affiliates Student Design Competition Student Leadership Council Classes and Other Educational Activities Site Map Search K-12 Education

  6. Role of Public Outreach in the University Science Mission: Publishing K-12 Curriculum, Organizing Tours, and Other Methods of Engagement

    Science.gov (United States)

    Dittrich, T. M.

    2015-12-01

    Much attention has been devoted in recent years to the importance of Science, Technology, Engineering, and Math (STEM) education in K-12 curriculum for developing a capable workforce. Equally important is the role of the voting public in understanding STEM-related issues that impact public policy debates such as the potential impacts of climate change, hydraulic fracturing in oil and gas exploration, mining impacts on water quality, and science funding. Since voted officials have a major impact on the future of these policies, it is imperative that the general public have an understanding of the basic science behind these issues. By engaging with the public in a more fundamental way, university students can play an important role in educating the public while at the same time enhancing their communication skills and gaining valuable teaching experience. I will talk about my own experiences in (1) evaluating and publishing water chemistry and hazardous waste cleanup curriculum on the K-12 engineering platform TeachEngineering.org, (2) organizing public tours of water and energy sites (e.g., abandoned mine sites, coal power plants, wastewater treatment plants, hazardous waste treatment facilities), and (3) other outreach and communication activities including public education of environmental issues through consultations with customers of a landscaping/lawn mowing company. The main focus of this presentation will be the role that graduate students can play in engaging and educating their local community and lessons learned from community projects (Dittrich, 2014; 2012; 2011). References: Dittrich, T.M. 2014. Adventures in STEM: Lessons in water chemistry from elementary school to graduate school. Abstract ED13E-07 presented at 2014 Fall Meeting, AGU, San Francisco, Calif., 15-19 Dec. Dittrich, T.M. 2012. Collaboration between environmental water chemistry students and hazardous waste treatment specialists on the University of Colorado-Boulder campus. Abstract ED53C

  7. A novel, simple, high-throughput method for isolation of genome-wide transposon insertion mutants of Escherichia coli K-12.

    Science.gov (United States)

    Miki, Takeyoshi; Yamamoto, Yoshihiro; Matsuda, Hideo

    2008-01-01

    We developed a novel, simple, high-throughput method for isolation of genome-wide transposon insertion mutants of Escherichia coli K-12. The basic idea of the method is to randomly disrupt the genes on the DNA fragments cloned on the Kohara library by inserting a mini-transposon first, and then transfer the disrupted genes from the lambda vector to the E. coli chromosome by homologous recombination. Using this method, we constructed a set of 8402 Km(r) cis-diploid mutants harboring a mini-Tn10 insertion mutation and the corresponding wild-type gene on a chromosome, as well as a set of 6954 haploid mutants derived from the cis-diploid mutants. The major advantage of the strategy used is that the indispensable genes or sites for growth can be identified. Preliminary results suggest that 415 open reading frames are indispensable for growth in E. coli cells. A total of 6404 haploid mutants were deposited to Genetic Strains Research Center, National Institute of Genetics, Japan (Chapter 26) and are available for public distribution upon request (http://shigen.lab.nig.ac.jp/ecoli/strain/nbrp/resource.jsp).

  8. Classifying K-12 Blended Learning

    Science.gov (United States)

    Staker, Heather; Horn, Michael B.

    2012-01-01

    The growth of online learning in the K-12 sector is occurring both remotely through virtual schools and on campuses through blended learning. In emerging fields, definitions are important because they create a shared language that enables people to talk about the new phenomena. The blended-learning taxonomy and definitions presented in this paper…

  9. Approaching K-12 Online Education in Pennsylvania

    Science.gov (United States)

    Vadell, Kathryn

    2013-01-01

    The purpose of this study is to determine how K-12 schools are addressing the need to accommodate online learners in Pennsylvania. It is built upon a review of literature focusing on educational legislation, the personalization of online learning and online learning solutions. The study posed 21 questions utilizing a mixed methods approach to…

  10. Internal Revolutions: Auto-Ethnography as a Method for Faculty Who Prepare K-12 Educators and Leaders at Hispanic Serving Institutions

    Science.gov (United States)

    Aguilar, Israel

    2017-01-01

    This article reinforces the use of research for faculty who prepare K-12 educators and leaders for social justice. The author conceptualizes auto-ethnography as a form of professional development and maintains that faculty must first experience an internal revolution before they can expect to model it, especially in a Hispanic Serving Institution…

  11. The Metamorphosis by K. (12)

    CERN Multimedia

    CERN Bulletin

    2012-01-01

    In the last issue of the Bulletin we reported on the first run of the new NA62 experiment. In this issue, we go behind the scenes to take a look at the production of the experiment's new kaon beam.   The start of the K12 beam line as seen during the installation of the shielding. 10-2, 10-3, 10-4, 10-5, 10-6 mbar… send in the protons! Since Thursday 1 November, the P42 beam line of the SPS has once again been sending protons to the beryllium target to produce the K12 kaon beam line eagerly awaited by the NA62 collaboration. This was no trivial matter! The first step was to clear the decks by dismantling the entire H10 beam line and NA60 experiment, as well as most of the NA48 experiment - representing some 1000 tonnes of equipment in total! Next came the complete renovation of the infrastructure, which dated back to 1979. The operation called on the expertise of virtually all branches of the EN and GS departments, as well as the Radiation Protection group: from ...

  12. K-12 Local Network (LAN) Design Guide

    National Research Council Canada - National Science Library

    Horton, Cody

    1998-01-01

    ...) educators preparing to design and implement LANs in K-12 schools and libraries. Data was collected during the implementation of LANs in K-12 schools of the Monterey Peninsula Uniform School District (MPUSD...

  13. Scientists Involved in K-12 Education

    Science.gov (United States)

    Robigou, V.

    2004-12-01

    The publication of countless reports documenting the dismal state of science education in the 1980s, and the Third International Mathematics and Science Study (TIMMS) report (1996) called for a wider involvement of the scientific community in K-12 education and outreach. Improving science education will not happen without the collaboration of educators and scientists working in a coordinated manner and it requires a long-term, continuous effort. To contribute effectively to K-12 education all scientists should refer to the National Science Education Standards, a set of policies that guide the development of curriculum and assessment. Ocean scientists can also specifically refer to the COSEE recommendations (www.cosee.org) that led to the creation of seven regional Centers for Ocean Sciences Education Excellence. Scientists can get involved in K-12 education in a multitude of ways. They should select projects that will accommodate time away from their research and teaching obligations, their talent, and their interest but also contribute to the education reform. A few examples of effective involvement are: 1) collaborating with colleagues in a school of education that can lead to better education of all students and future teachers, 2) acting as a resource for a national program or a local science fair, 3) serving on the advisory board of a program that develops educational material, 4) speaking out at professional meetings about the value of scientists' involvement in education, 5) speaking enthusiastically about the teaching profession. Improving science education in addition to research can seem a large, overwhelming task for scientists. As a result, focusing on projects that will fit the scientist's needs as well as benefit the science reform is of prime importance. It takes an enormous amount of work and financial and personnel resources to start a new program with measurable impact on students. So, finding the right opportunity is a priority, and stepping

  14. Engineering Education in K-12 Schools

    Science.gov (United States)

    Spence, Anne

    2013-03-01

    Engineers rely on physicists as well as other scientists and mathematicians to explain the world in which we live. Engineers take this knowledge of the world and use it to create the world that never was. The teaching of physics and other sciences as well as mathematics is critical to maintaining our national workforce. Science and mathematics education are inherently different, however, from engineering education. Engineering educators seek to enable students to develop the habits of mind critical for innovation. Through understanding of the engineering design process and how it differs from the scientific method, students can apply problem and project based learning to solve the challenges facing society today. In this talk, I will discuss the elements critical to a solid K-12 engineering education that integrates science and mathematics to solve challenges throughout the world.

  15. Copyright Updates for K-12 Librarians

    Science.gov (United States)

    Johnson, Wendell G.

    2016-01-01

    Copyright concerns continue to bedevil K-12 librarians, who are often called upon to act as the copyright officers in public schools. This article describes recent copyright developments of concern to these librarians in three areas: a recent court case involving a university library, pending legislation supported by ALA, and a regulatory update.…

  16. Energy Retrofit for Aging K-12 Schools.

    Science.gov (United States)

    3D/International, Houston, TX.

    Successfully retrofitting aging K-12 schools using energy conservation measures (ECM) that can improve the physical plant and reduce energy consumption are explored. Topics explore how certain ECM measures can benefit educational facilities, why retrofitting begun sooner rather than later is important, how to finance the retrofit program, and the…

  17. K-12 Mathematics and the Web

    Science.gov (United States)

    Glazer, Evan

    2005-01-01

    The Web offers numerous learning resources and opportunities for K-12 mathematics education. This paper discusses those resources and opportunities. Discussion includes (a) asynchronous and synchronous communication tools, (b) the use of data sets to make connections between mathematics concepts and real-world applications, and (c) interactive…

  18. Inspiring the Next Generation: Astronomy Catalyzes K12 STEM Education

    Science.gov (United States)

    Borders, Kareen; Thaller, Michelle; Winglee, Robert; Borders, Kyla

    2017-06-01

    K-12 educators need effective and relevant astronomy professional development. NASA's Mission Science provides innovative and accessible opportunities for K-12 teachers. Science questions involve scale and distance, including Moon/Earth scale, solar system scale, and distance of objects in the universe. Teachers can gain an understanding of basic telescopes, the history of telescopes, ground and satellite based telescopes, and models of JWST Telescope. An in-depth explanation of JWST and Spitzer telescopes gave participants background knowledge for infrared astronomy observations. During teacher training, we taught the electromagnetic spectrum through interactive stations. The stations included an overview via lecture and power point, the use of ultraviolet beads to determine ultraviolet exposure, the study of lenticulars and diagramming of infrared data, looking at visible light through diffraction glasses and diagramming the data, protocols for using astronomy based research in the classroom, and infrared thermometers to compare environmental conditions around the observatory. An overview of LIDAR physics was followed up by a simulated LIDAR mapping of the topography of Mars.We will outline specific steps for K-12 infrared astronomy professional development, provide data demonstrating the impact of the above professional development on educator understanding and classroom use, and detail future plans for additional K-12 professional development.Funding was provided by Washington STEM, NASA, and the Washington Space Grant Consortium.

  19. Interstellar Molecules in K-12 Education

    Science.gov (United States)

    Kuiper, T. B. H.; Hofstadter, M. D.; Levin, S. M.; MacLaren, D.

    2006-12-01

    The Lewis Center for Educational Research (LCER) and the Jet Propulsion Laboratory (JPL) collaborate in a K-12 educational project in which students conduct observations for several research programs led by radio astronomers. The Goldstone-Apple Valley Radio Telescope (GAVRT) program provides participating teachers with curriculum elements, based on the students' observing experiences, which support national and state academic standards. The current program is based on 2.2-GHz and 8.4-GHz radiometric observations of variable sources. The research programs monitor Jupiter, Uranus, and a selected set of quasars. The telescope is a decommissioned NASA Deep Space Network antenna at Goldstone, California. In the next three years, a second telescope will be added. This telescope will at least operate at the above frequencies as well as 6 GHz and 12 GHz. Possibly, it will operate in a continuous band from 1.2 GHz to 14 GHz. In either case, the telescope will be able to observe at least the 6.6-GHz and 12.2-GHz methanol maser lines. The success of the GAVRT program depends critically on the participation of scientists committed to the research who have the ability and enthusiasm for interacting with K-12 students, typically through teleconferences. The scientists will initially work with the LCER staff to create curriculum elements around their observing program.

  20. K-12 Professional Development at the Harvard Forest LTER

    Science.gov (United States)

    Bennett, K.

    2012-12-01

    As part of the Long Term Ecological Research (LTER) program, the Harvard Forest in Petersham, Massachusetts seeks to train the next generation of researchers, by involving K-12 grade students and their teachers in hands-on, field-based, ecological research in their own schoolyard and community. Students learn to collect data on important long-term ecological issues and processes. Student data are then shared on the Harvard Forest website. To prepare teachers for project protocols, teachers are given direct access to Harvard ecologists with professional development workshops and on-line resources. With the Harvard Forest Schoolyard LTER program, students can participate in three different research projects focusing on phenology, invasive insects, and vernal pools. Teachers attend the Summer Institute for Teachers to learn project content and methods. They return in fall to participate in one of three levels of data workshops to learn how to input, manage, and analyze project data. In the spring, teachers again meet with the Harvard ecologists about project protocols, and to share, through a series of teacher presentations, the ways these project themes are being integrated into class curricula. These professional development opportunities result in long term collaborative partnerships with local schools and the Harvard Forest LTER. In addition to the LTER Schoolyard Ecology Program, the Harvard Forest has supported a successful Research Experience for Teachers (RET) program for the last six years. Throughout the summer, teachers work on research projects alongside Harvard Forest and affiliated scientists, post-docs, graduate students, and REU's (Research Experience for Undergraduates). The RET program provides teachers with the opportunity to build scientific knowledge, develop an understanding of research methods, and translate their new knowledge and experiences into cutting edge classroom lessons. The past two summers I have worked with Dr. Andrew Richardson

  1. Active Commuting among K-12 Educators: A Study Examining Walking and Biking to Work

    OpenAIRE

    Bopp, Melissa; Hastmann, Tanis J.; Norton, Alyssa N.

    2013-01-01

    Background. Walking and biking to work, active commuting (AC) is associated with many health benefits, though rates of AC remain low in the US. K-12 educators represent a significant portion of the workforce, and employee health and associated costs may have significant economic impact. Therefore, the purpose of this study was to examine the current rates of AC and factors associated with AC among K-12 educators. Methods. A volunteer sample of K-12 educators (n = 437) was recruited to partici...

  2. Lon gene and photoprotection in Escherichia coli K-12

    Energy Technology Data Exchange (ETDEWEB)

    Waksman, G.; Thomas, G.; Favre, A. (Institut de Recherche en Biologie Moleculaire, Group de Photobiologie Moleculaire, Paris (France))

    1984-03-01

    Photoprotection, i.e. the increased resistance of the cells preilluminated with near ultraviolet light (300-380 nm) to the lethal action of 254nm radiations requires either an integrated prophage or a recA mutation in Escherichia coli K12 strains. Significant photoprotection occurs in an Escherichia coli K12 recA/sup +/ cell containing the lon allele responsible for filamentous growth after 254nm irradiation. The Fil phenotype can be suppressed by the sfiA or sfiB suppressor genes. Since the E. coli K12 recA/sup +/ lon sfiB strain exhibits no more photoprotection, it is concluded that in lon strains photoprotection is due to the abolition of the 254nm induced filamentation by the near ultraviolet treatment. In addition, near ultraviolet illumination of the cells leads to a severe restriction of the bulk protein synthesis. This effect is observed only in nuv/sup +/ cells that contain 4-thiouridine the chromophore responsible for photoprotection. It is proposed that in lon (lysogenic strains) photoprotection is due to prevention of the SOS response. During the growth lag, the low residual level of protein synthesis does not allow the induction of the SOS response and accordingly prevents filamentation (the lytic cycle).

  3. The lon gene and photoprotection in Escherichia coli K-12

    International Nuclear Information System (INIS)

    Waksman, G.; Thomas, G.; Favre, A.

    1984-01-01

    Photoprotection, i.e. the increased resistance of the cells preilluminated with near ultraviolet light (300-380 nm) to the lethal action of 254nm radiations requires either an integrated prophage or a recA mutation in Escherichia coli K12 strains. Significant photoprotection occurs in an Escherichia coli K12 recA + cell containing the lon allele responsible for filamentous growth after 254nm irradiation. The Fil phenotype can be suppressed by the sfiA or sfiB suppressor genes. Since the E. coli K12 recA + lon sfiB strain exhibits no more photoprotection, it is concluded that in lon strains photoprotection is due to the abolition of the 254nm induced filamentation by the near ultraviolet treatment. In addition, near ultraviolet illumination of the cells leads to a severe restriction of the bulk protein synthesis. This effect is observed only in nuv + cells that contain 4-thiouridine the chromophore responsible for photoprotection. It is proposed that in lon (lysogenic strains) photoprotection is due to prevention of the SOS response. During the growth lag, the low residual level of protein synthesis does not allow the induction of the SOS response and accordingly prevents filamentation (the lytic cycle). (author)

  4. Retaining K-12 Online Teachers: A Predictive Model for K-12 Online Teacher Turnover

    Science.gov (United States)

    Larkin, Ingle M.; Lokey-Vega, Anissa; Brantley-Dias, Laurie

    2018-01-01

    The purpose of this study was to measure and explore factors influencing K-12 online teachers' turnover intentions, with job satisfaction and organizational commitment serving as moderating variables. Using Fishbein and Ajzen's Theory of Reasoned Action and Planned Behavior (1975), this study was conducted in public, private, charter, for-profit,…

  5. K-12 educational outcomes of immigrant youth.

    Science.gov (United States)

    Crosnoe, Robert; Turley, Ruth N López

    2011-01-01

    The children from immigrant families in the United States make up a historically diverse population, and they are demonstrating just as much diversity in their experiences in the K-12 educational system. Robert Crosnoe and Ruth López Turley summarize these K-12 patterns, paying special attention to differences in academic functioning across segments of the immigrant population defined by generational status, race and ethnicity, and national origin. A good deal of evidence points to an immigrant advantage in multiple indicators of academic progress, meaning that many youths from immigrant families outperform their peers in school. This apparent advantage is often referred to as the immigrant paradox, in that it occurs despite higher-than-average rates of social and economic disadvantages in this population as a whole. The immigrant paradox, however, is more pronounced among the children of Asian and African immigrants than other groups, and it is stronger for boys than for girls. Furthermore, evidence for the paradox is far more consistent in secondary school than in elementary school. Indeed, school readiness appears to be one area of potential risk for children from immigrant families, especially those of Mexican origin. For many groups, including those from Latin America, any evidence of the immigrant paradox usually emerges after researchers control for family socioeconomic circumstances and youths' English language skills. For others, including those from Asian countries, it is at least partially explained by the tendency for more socioeconomically advantaged residents of those regions to leave their home country for the United States. Bilingualism and strong family ties help to explain immigrant advantages in schooling; school, community, and other contextual disadvantages may suppress these advantages or lead to immigrant risks. Crosnoe and Turley also discuss several policy efforts targeting young people from immigrant families, especially those of Latin

  6. NASA-OAI HPCCP K-12 Program

    Science.gov (United States)

    1994-01-01

    The NASA-OAI High Performance Communication and Computing K- 12 School Partnership program has been completed. Cleveland School of the Arts, Empire Computech Center, Grafton Local Schools and the Bug O Nay Ge Shig School have all received network equipment and connections. Each school is working toward integrating computer and communications technology into their classroom curriculum. Cleveland School of the Arts students are creating computer software. Empire Computech Center is a magnet school for technology education at the elementary school level. Grafton Local schools is located in a rural community and is using communications technology to bring to their students some of the same benefits students from suburban and urban areas receive. The Bug O Nay Ge Shig School is located on an Indian Reservation in Cass Lake, MN. The students at this school are using the computer to help them with geological studies. A grant has been issued to the friends of the Nashville Library. Nashville is a small township in Holmes County, Ohio. A community organization has been formed to turn their library into a state of the art Media Center. Their goal is to have a place where rural students can learn about different career options and how to go about pursuing those careers. Taylor High School in Cincinnati, Ohio was added to the schools involved in the Wind Tunnel Project. A mini grant has been awarded to Taylor High School for computer equipment. The computer equipment is utilized in the school's geometry class to computationally design objects which will be tested for their aerodynamic properties in the Barberton Wind Tunnel. The students who create the models can view the test in the wind tunnel via desk top conferencing. Two teachers received stipends for helping with the Regional Summer Computer Workshop. Both teachers were brought in to teach a session within the workshop. They were selected to teach the session based on their expertise in particular software applications.

  7. Infrared Astronomy Professional Development for K-12 Educators: WISE Telescope

    Science.gov (United States)

    Borders, Kareen; Mendez, B. M.

    2010-01-01

    K-12 educators need effective and relevant astronomy professional development. WISE Telescope (Wide-Field Infrared Survey Explorer) and Spitzer Space Telescope Education programs provided an immersive teacher professional development workshop at Arecibo Observatory in Puerto Rico during the summer of 2009. As many common misconceptions involve scale and distance, teachers worked with Moon/Earth scale, solar system scale, and distance of objects in the universe. Teachers built and used basic telescopes, learned about the history of telescopes, explored ground and satellite based telescopes, and explored and worked on models of WISE Telescope. An in-depth explanation of WISE and Spitzer telescopes gave participants background knowledge for infrared astronomy observations. We taught the electromagnetic spectrum through interactive stations. The stations included an overview via lecture and power point, the use of ultraviolet beads to determine ultraviolet exposure, the study of WISE lenticulars and diagramming of infrared data, listening to light by using speakers hooked up to photoreceptor cells, looking at visible light through diffraction glasses and diagramming the data, protocols for using astronomy based research in the classroom, and infrared thermometers to compare environmental conditions around the observatory. An overview of LIDAR physics was followed up by a simulated LIDAR mapping of the topography of Mars. We will outline specific steps for K-12 infrared astronomy professional development, provide data demonstrating the impact of the above professional development on educator understanding and classroom use, and detail future plans for additional K-12 professional development. Funding was provided by WISE Telescope, Spitzer Space Telescope, Starbucks, Arecibo Observatory, the American Institute of Aeronautics and Astronautics, and the Washington Space Grant Consortium.

  8. Laboratory Safety Guide for Arkansas K-12 Schools.

    Science.gov (United States)

    Arkansas State Dept. of Education, Little Rock.

    This document presents laboratory safety rules for Arkansas K-12 schools which were developed by the Arkansas Science Teachers Association (ASTA) and the Arkansas Department of Education (ADE). Contents include: (1) "Laboratory Safety Guide for Arkansas K-12 Schools"; (2) "Safety Considerations"; (3) "Safety Standards for Science Laboratories";…

  9. Digital Learning in California's K-12 Schools. Just the Facts

    Science.gov (United States)

    Gao, Niu

    2015-01-01

    This fact page briefly discusses the following facts on digital learning in California's K-12: (1) As California implements new tests in its K-12 schools, technology infrastructure is a key concern; (2) Many districts are confident that they had enough bandwidth for online field tests; (3) Digital learning will require significantly greater…

  10. Keeping Pace with K-12 Online Learning, 2016

    Science.gov (United States)

    Gemin, Butch; Pape, Larry

    2017-01-01

    "Keeping Pace with K-12 Online Learning 2016" marks the thirteenth consecutive year Evergreen has published its annual research of the K-12 education online learning market. The thirteen years of researching, writing and publishing this report represents a time of remarkable change. There has been a constant presence that has become the…

  11. K-12 Technology Accessibility: The Message from State Governments

    Science.gov (United States)

    Shaheen, Natalie L.; Lazar, Jonathan

    2018-01-01

    This study examined state education technology plans and technology accessibility statutes to attempt to answer the question--is K-12 instructional technology accessibility discussed in state-level technology accessibility statutes and education technology plans across the 50 United States? When a K-12 school district is planning the construction…

  12. Effusion plate using additive manufacturing methods

    Science.gov (United States)

    Johnson, Thomas Edward; Keener, Christopher Paul; Ostebee, Heath Michael; Wegerif, Daniel Gerritt

    2016-04-12

    Additive manufacturing techniques may be utilized to construct effusion plates. Such additive manufacturing techniques may include defining a configuration for an effusion plate having one or more internal cooling channels. The manufacturing techniques may further include depositing a powder into a chamber, applying an energy source to the deposited powder, and consolidating the powder into a cross-sectional shape corresponding to the defined configuration. Such methods may be implemented to construct an effusion plate having one or more channels with a curved cross-sectional geometry.

  13. California's K-12 Public Schools. How Are They Doing?

    National Research Council Canada - National Science Library

    Carroll, Stephen J; Krop, Cathy; Arkes, Jeremy; Morrison, Peter A; Flanagan, Ann

    2005-01-01

    ... are no longer performing as well as they did previously or as well as schools in other states. The primary objective of our study was to look closely at California's public system of kindergarten through twelfth grade (K-12...

  14. A Vision in Aeronautics: The K-12 Wind Tunnel Project

    Science.gov (United States)

    1997-01-01

    A Vision in Aeronautics, a project within the NASA Lewis Research Center's Information Infrastructure Technologies and Applications (IITA) K-12 Program, employs small-scale, subsonic wind tunnels to inspire students to explore the world of aeronautics and computers. Recently, two educational K-12 wind tunnels were built in the Cleveland area. During the 1995-1996 school year, preliminary testing occurred in both tunnels.

  15. Supplier Selection Using Weighted Utility Additive Method

    Science.gov (United States)

    Karande, Prasad; Chakraborty, Shankar

    2015-10-01

    Supplier selection is a multi-criteria decision-making (MCDM) problem which mainly involves evaluating a number of available suppliers according to a set of common criteria for choosing the best one to meet the organizational needs. For any manufacturing or service organization, selecting the right upstream suppliers is a key success factor that will significantly reduce purchasing cost, increase downstream customer satisfaction and improve competitive ability. The past researchers have attempted to solve the supplier selection problem employing different MCDM techniques which involve active participation of the decision makers in the decision-making process. This paper deals with the application of weighted utility additive (WUTA) method for solving supplier selection problems. The WUTA method, an extension of utility additive approach, is based on ordinal regression and consists of building a piece-wise linear additive decision model from a preference structure using linear programming (LP). It adopts preference disaggregation principle and addresses the decision-making activities through operational models which need implicit preferences in the form of a preorder of reference alternatives or a subset of these alternatives present in the process. The preferential preorder provided by the decision maker is used as a restriction of a LP problem, which has its own objective function, minimization of the sum of the errors associated with the ranking of each alternative. Based on a given reference ranking of alternatives, one or more additive utility functions are derived. Using these utility functions, the weighted utilities for individual criterion values are combined into an overall weighted utility for a given alternative. It is observed that WUTA method, having a sound mathematical background, can provide accurate ranking to the candidate suppliers and choose the best one to fulfill the organizational requirements. Two real time examples are illustrated to prove

  16. A Groundwater project for K-12 schools: Bringing research into the classroom

    Science.gov (United States)

    Rodak, C. M.; Walsh, M.; Gensic, J.

    2011-12-01

    Simple water quality test kits were used in a series of K-12 classrooms to demonstrate scientific processes and to motivate learning in K-12 students. While focused on student learning, this project also allowed collection of regional data on groundwater quality (primarily nitrate) in the study area. The project consisted of development and administration of a weeklong groundwater quality unit introduced to K-12 schools in northern Indiana and taught by a graduate student in an engineering discipline. The structure of the week started with an introduction to basic groundwater concepts modified for the specific grade level; for this project the students ranged from grades 4-12. In addition to groundwater basics, the purpose of the collection of the water quality data, as well as relevance to the research of the graduate student, were outlined. The students were then: (i) introduced to two simple water quality testing methods for nitrates, (ii) required to hypothesize as to which method will likely be "better" in application, and (iii) asked to practice using these two methods under laboratory conditions. Following practice, the students were asked to discuss their hypotheses relative to what was observed during the practice focusing on which testing method was more accurate and/or precise. The students were then encouraged to bring water samples from their home water system (many of which are on private wells) to analyze within groups. At the end of the week, the students shared their experience in this educational effort, as well as the resulting nitrate data from numerous groundwater wells (as collected by the students). Following these discussions the data were added to an online database housed on a wiki sponsored by the Notre Dame Extended Research Community (http://wellhead.michianastem.org/home). These data were plotted using the free service MapAList to visually demonstrate to the students the spatial distribution of the data and how their results have

  17. One-to-One Technology in K-12 Classrooms: A Review of the Literature from 2004 through 2014

    Science.gov (United States)

    Harper, Ben; Milman, Natalie B.

    2016-01-01

    This literature review examined empirical research conducted between 2004 and 2014 regarding 1:1 technologies in K-12 educational settings. Our overarching research question was: What does research tell us about 1:1 technology in K-12 classrooms? We used the constant-comparative method to analyze, code, and induce themes from 46 relevant articles.…

  18. The Effectiveness of Educational Technology Applications for Enhancing Mathematics Achievement in K-12 Classrooms: A Meta-Analysis. Educator's Summary

    Science.gov (United States)

    Center for Research and Reform in Education, 2012

    2012-01-01

    This review summarizes research on the effects of technology use on mathematics achievement in K-12 classrooms. The main research questions included: (1) Do education technology applications improve mathematics achievement in K-12 classrooms as compared to traditional teaching methods without education technology?; and (2) What study and research…

  19. "Flipping" educational technology professional development for K-12 educators

    Science.gov (United States)

    Spencer, Daniel

    As the demand for more effective professional development increases in K-12 schools, trainers must adjust their training methods to meet the needs of their teacher learners. Just as lecture-heavy, teacher-centered instruction only meet the learning needs of a small minority of students, "sit and get" professional development rarely results in the teachers gaining the skills and confidence necessary to use technology effectively in their instruction. To resolve the frustrations of teachers related to ineffective professional development, a "Flipped PD" training model was developed based on the learning needs of adult learners, the integration of technological, pedagogical, and content knowledge (TPACK), learning activities, and the Flipped Classroom concept. Under this model, training shifts from a passive, trainer-centered format, to an active, learner-centered format where teachers learn to use technology in their classrooms by first focusing on pedagogical issues, then choosing the options that work best for addressing those issues in their unique situation, and completing "learn-by-doing" projects. Those who participate in "Flipped PD" style trainings tend to have more confidence upon completion that they can use the tools they were trained on in their teaching, as well as believe that the PD was engaging and a good use of their time.

  20. Career education attitudes and practices of K-12 science educators

    Science.gov (United States)

    Smith, Walter S.

    A random sample of 400 K-12 science educators who were members of the National Science Teachers Association were surveyed regarding their attitude toward and practice of career education in their science teaching. These science teachers rejected a narrowly vocational view, favoring instead a conception of career education which included self-perception, values analysis, and vocational skills objectives. The science educators affirmed the importance of career education for a student's education, asserted career education ought to be taught in their existing science courses, and expressed a willingness to do so. Fewer than one-third of the science teachers, however, reported incorporating career education at least on a weekly basis in their science lessons. The major impediment to including more career education in science teaching was seen to be their lack of knowledge of methods and materials relevant to science career education, rather than objections from students, parents, or administrators; their unwillingness; or their evaluation of career education as unimportant. Thus, in order to improve this aspect of science teaching, science teachers need more concrete information about science career education applications.

  1. Tablets in K-12 Education: Integrated Experiences and Implications

    Science.gov (United States)

    An, Heejung, Ed.; Alon, Sandra, Ed.; Fuentes, David, Ed.

    2015-01-01

    The inclusion of new and emerging technologies in the education sector has been a topic of interest to researchers, educators, and software developers alike in recent years. Utilizing the proper tools in a classroom setting is a critical factor in student success. "Tablets in K-12 Education: Integrated Experiences and Implications"…

  2. The Green Pages: Environmental Education Activities K-12.

    Science.gov (United States)

    Clearing, 1990

    1990-01-01

    Presented are 37 environmental science activities for students in grades K-12. Topics include water pollution, glaciers, protective coloration, shapes in nature, environmental impacts, recycling, creative writing, litter, shapes found in nature, color, rain cycle, waste management, plastics, energy, pH, landfills, runoff, watersheds,…

  3. Transforming K-12 Rural Education through Blended Learning: Teacher Perspectives

    Science.gov (United States)

    Kellerer, Paula; Kellerer, Eric; Werth, Eric; Werth, Lori; Montgomery, Danielle; Clyde, Rozella; Cozart, Joe; Creach, Laura; Hibbard, Laura; LaFrance, Jason; Rupp, Nadine; Walker, Niki; Carter, Theresa; Kennedy, Kathryn

    2014-01-01

    A qualitative study exploring rural teacher perspectives on the impact of blended learning on students and teachers was conducted in Idaho during the Fall of 2013. Researchers from Northwest Nazarene University's DOCEO Center in partnership with Idaho Digital Learning Academy (IDLA) and the International Association for K-12 Online Learning…

  4. Designer Librarian: Embedded in K12 Online Learning

    Science.gov (United States)

    Boyer, Brenda

    2015-01-01

    Over the past two decades, shifts in technology have altered the roles of school librarians in a multitude of ways. New rigorous standards, proliferation of devices, and steady growth of online and blended learning for the K12 market now demand librarians engage with learners in online environments. Taking an instructional design approach is the…

  5. Designing GIS Learning Materials for K-12 Teachers

    Science.gov (United States)

    Hong, Jung Eun

    2017-01-01

    Although previous studies have proven the usefulness and effectiveness of geographic information system (GIS) use in the K-12 classroom, the rate of teacher adoption remains low. The identified major barrier to its use is a lack of teachers' background and experience. To solve this limitation, many organisations have provided GIS-related teacher…

  6. Draft Genome Sequence of Escherichia coli K-12 (ATCC 10798)

    OpenAIRE

    Dimitrova, Daniela; Engelbrecht, Kathleen C.; Putonti, Catherine; Koenig, David W.; Wolfe, Alan J.

    2017-01-01

    ABSTRACT Here, we present the draft genome sequence of Escherichia coli ATCC 10798. E.?coli ATCC 10798 is a K-12 strain, one of the most well-studied model microorganisms. The size of the genome was 4,685,496?bp, with a G+C content of 50.70%. This assembly consists of 62 contigs and the F plasmid.

  7. Evaluating the Performance of Online K-12 Schools

    Science.gov (United States)

    Carpenter, Dick; Kafer, Krista; Reeser, Kelly; Shafer, Sheryl

    2015-01-01

    This article examines K-12 online student and school performance across an entire state (Colorado) in the United States through two comparisons. First, state assessment scores of students in online schools are compared to those in traditional brick and mortar schools. Second, the accountability scores of online schools are compared to those of…

  8. Leadership Analysis in K-12 Case Study: "Divided Loyalties"

    Science.gov (United States)

    Alsubaie, Merfat Ayesh

    2016-01-01

    This report mainly aims to provide a critical and in-depth analysis of the K-12 Case, "Divided Loyalty" by Holy and Tartar (2004). The case recounts how the manifestation of inadequate leadership skills in a school setting could affect negatively the performance of students.

  9. K-12 Marketplace Sees Major Flow of Venture Capital

    Science.gov (United States)

    Ash, Katie

    2012-01-01

    The flow of venture capital into the K-12 education market has exploded over the past year, reaching its highest transaction values in a decade in 2011, industry observers say. They attribute that rise to such factors as a heightened interest in educational technology; the decreasing cost of electronic devices such as tablet computers, laptops,…

  10. Enriching K-12 Science and Mathematics Education Using LEGOs

    Science.gov (United States)

    Williams, Keeshan; Igel, Irina; Poveda, Ronald; Kapila, Vikram; Iskander, Magued

    2012-01-01

    This paper presents a series of illustrative LEGO Mindstorms-based science and math activities, developed under an NSF GK-12 Fellows project, for elementary, middle, and high school grades. The activities, developed by engineering and science graduate Fellows in partnership with K-12 teachers, are grade appropriate, address pertinent learning…

  11. Online System Adoption and K-12 Academic Outcomes

    Science.gov (United States)

    Kimmons, R.

    2015-01-01

    This study seeks to understand the relationship between K-12 online system adoption (e.g., Blackboard, Edmodo, WordPress) and school-level academic achievement ratings. Utilizing a novel approach to data collection via website data extraction and indexing of all school websites in a target state in the United States (n?=?732) and merging these…

  12. Gender Sorting across K-12 Schools in the United States

    Science.gov (United States)

    Long, Mark C.; Conger, Dylan

    2013-01-01

    This article documents evidence of nonrandom gender sorting across K-12 schools in the United States. The sorting exists among coed schools and at all grade levels, and it is highest in the secondary school grades. We observe some gender sorting across school sectors and types: for instance, males are slightly underrepresented in private schools…

  13. Florida's Opinion on K-12 Public Education Spending

    Science.gov (United States)

    Forster, Greg

    2006-01-01

    This scientifically representative poll of 1,200 Floridians finds that public opinion about K-12 public education spending is seriously misinformed. Floridians think public schools need more money, but the main reason is that they are badly mistaken about how much money the public schools actually get. Key findings of the study include: (1) Half…

  14. Exploring the Effectiveness of Online Education in K-12 Environments

    Science.gov (United States)

    Heafner, Tina L., Ed.; Hartshorne, Richard, Ed.; Petty, Teresa, Ed.

    2015-01-01

    The integration of technology in classrooms is rapidly emerging as a way to provide more educational opportunities for students. As virtual learning environments become more popular, evaluating the impact of this technology on student success is vital. "Exploring the Effectiveness of Online Education in K-12 Environments" combines…

  15. Information Security Management Practices of K-12 School Districts

    Science.gov (United States)

    Nyachwaya, Samson

    2013-01-01

    The research problem addressed in this quantitative correlational study was the inadequacy of sound information security management (ISM) practices in K-12 school districts, despite their increasing ownership of information assets. Researchers have linked organizational and sociotechnical factors to the implementation of information security…

  16. Perceptions of Professional and Educational Skills Learning Opportunities Made Available through K-12 Robotics Programming

    Science.gov (United States)

    Bakke, Christine K.

    2013-01-01

    The purpose of this study is to examine whether participation in robotics provides opportunities for educational and professional skill development, significant enough to merit the recommendation of robotics courses as a part of mainstream curriculum offerings in K-12 schools. This non-experimental, mixed methods study examined current junior high…

  17. Manifesting Destiny: Re/Presentations of Indigenous Peoples in K-12 U.S. History Standards

    Science.gov (United States)

    Shear, Sarah B.; Knowles, Ryan T.; Soden, Gregory J.; Castro, Antonio J.

    2015-01-01

    In this mixed-methods study, we use a postcolonial framework to investigate how state standards represent Indigenous histories and cultures. The research questions that guided this study include: (a) What is the frequency of Indigenous content (histories, cultures, current issues) covered in state-level U.S. history standards for K-12? (b) What is…

  18. K-12 Online Teacher Beliefs: Relationships among Intelligence, Confidence, Teacher-Student Interactions, and Student Outcomes

    Science.gov (United States)

    Vander Ploeg, Guadalupe

    2012-01-01

    The vigorous expansion of online learning in K-12 education is a recent change to the conceptualization of schooling that has been occurring for more than 10 years. However, methods used for recruiting, hiring, and preparing online teachers have not been altered beyond the current federal standard defined by No Child Left Behind of Highly…

  19. Indiana's New and (Somewhat) Improved K-12 School Finance System. School Choice Issues in the State

    Science.gov (United States)

    Aud, Susan L.

    2005-01-01

    Education finance policy has become an urgent concern in many state legislatures. Demands for greater equity and accountability have forced states to review, and in many cases to revise, the method by which schools are funded. This study sheds light on Indiana's financing of public K-12 education by providing a clear explanation of the components…

  20. Soil Science Society of America - K-12 Outreach

    Science.gov (United States)

    Lindbo, David L.; Loynachan, Tom; Mblia, Monday; Robinson, Clay; Chapman, Susan

    2013-04-01

    The Soil Science Society of America created its K12 Committee in 2006 in part to compliment the Dig It! The Secrets of Soil exhibit that opened in July 2008 at the Smithsonian's Institution's Nation Museum of Natural History (of which SSS was a founding sponsor). The committee's work began quickly with a website designed to provide resources for K12 teachers. The first accomplishments included reviewing and posting links to web based information already available to teachers. These links were sorted by subject and grade level to make it easier for teachers to navigate the web and find what they needed quickly. Several presentations and lessons designed for K12 teachers were also posted at this time. Concurrent with this effort a subcommittee review and organized the national teaching standards to show where soils could fit into the overall K12 curriculum. As the website was being developed another subcommittee developed a soils book (Soil! Get the Inside Scoop, 2008) to further compliment the Dig It! exhibit. This was a new endeavor for SSSA having never worked with the non-academic audience in developing a book. Peer-reviews of this book included not only scientist but also students in order to make sure the book was attractive to them. Once the book was published and the website developed it became clear more outreach was needed. SSSA K12 Committee has attended both the National Science Teachers Association (since 2008) the USA Science and Engineering Festival (since 2010) with exhibits and workshops. It has cooperated and contributed to the American Geologic Institutes' Earth Science Week materials with brochures and lesson plans and with National Association of Conservation Districts by providing peer-review and distribution of materials. The most recent developments from the committee include a web redesign that is more student and teacher friendly, the development of a peer-review system to publish K12 Lesson Plans, and finally the publication of a new soils

  1. Technical Feasibility Study for Zero Energy K-12 Schools

    Energy Technology Data Exchange (ETDEWEB)

    Bonnema, Eric [National Renewable Energy Lab. (NREL), Golden, CO (United States); Goldwasser, David [National Renewable Energy Lab. (NREL), Golden, CO (United States); Torcellini, Paul [National Renewable Energy Lab. (NREL), Golden, CO (United States); Pless, Shanti [National Renewable Energy Lab. (NREL), Golden, CO (United States); Studer, Daniel [National Renewable Energy Lab. (NREL), Golden, CO (United States)

    2016-11-01

    This technical feasibility study provides documentation and research results supporting a possible set of strategies to achieve source zero energy K-12 school buildings as defined by the U.S. Department of Energy (DOE) zero energy building (ZEB) definition (DOE 2015a). Under this definition, a ZEB is an energy-efficient building in which, on a source energy basis, the actual annual delivered energy is less than or equal to the on-site renewable exported energy.

  2. Draft Genome Sequence of Escherichia coli K-12 (ATCC 10798).

    Science.gov (United States)

    Dimitrova, Daniela; Engelbrecht, Kathleen C; Putonti, Catherine; Koenig, David W; Wolfe, Alan J

    2017-07-06

    Here, we present the draft genome sequence of Escherichia coli ATCC 10798. E. coli ATCC 10798 is a K-12 strain, one of the most well-studied model microorganisms. The size of the genome was 4,685,496 bp, with a G+C content of 50.70%. This assembly consists of 62 contigs and the F plasmid. Copyright © 2017 Dimitrova et al.

  3. K-12 STEM Educators and the Inclusive Classroom

    OpenAIRE

    Li, Songze

    2016-01-01

    The United States public schools promote inclusion and educational equity among diverse student populations. Considerable and growing numbers of students with categorical disabilities and Limited English Proficiency (LEP) are enrolled in regular classrooms. The systemic barriers in learning that they have could impact teacher perceptions and decisions about teaching practices as well as the teaching profession. These students have challenged K-12 science, technology, engineering, and mathemat...

  4. Involving Practicing Scientists in K-12 Science Teacher Professional Development

    Science.gov (United States)

    Bertram, K. B.

    2011-12-01

    The Science Teacher Education Program (STEP) offered a unique framework for creating professional development courses focused on Arctic research from 2006-2009. Under the STEP framework, science, technology, engineering, and math (STEM) training was delivered by teams of practicing Arctic researchers in partnership with master teachers with 20+ years experience teaching STEM content in K-12 classrooms. Courses based on the framework were offered to educators across Alaska. STEP offered in-person summer-intensive institutes and follow-on audio-conferenced field-test courses during the academic year, supplemented by online scientist mentorship for teachers. During STEP courses, teams of scientists offered in-depth STEM content instruction at the graduate level for teachers of all grade levels. STEP graduate-level training culminated in the translation of information and data learned from Arctic scientists into standard-aligned lessons designed for immediate use in K-12 classrooms. This presentation will focus on research that explored the question: To what degree was scientist involvement beneficial to teacher training and to what degree was STEP scientist involvement beneficial to scientist instructors? Data sources reveal consistently high levels of ongoing (4 year) scientist and teacher participation; high STEM content learning outcomes for teachers; high STEM content learning outcomes for students; high ratings of STEP courses by scientists and teachers; and a discussion of the reasons scientists indicate they benefited from STEP involvement. Analyses of open-ended comments by teachers and scientists support and clarify these findings. A grounded theory approach was used to analyze teacher and scientist qualitative feedback. Comments were coded and patterns analyzed in three databases. The vast majority of teacher open-ended comments indicate that STEP involvement improved K-12 STEM classroom instruction, and the vast majority of scientist open-ended comments

  5. Active Commuting among K-12 Educators: A Study Examining Walking and Biking to Work

    Directory of Open Access Journals (Sweden)

    Melissa Bopp

    2013-01-01

    Full Text Available Background. Walking and biking to work, active commuting (AC is associated with many health benefits, though rates of AC remain low in the US. K-12 educators represent a significant portion of the workforce, and employee health and associated costs may have significant economic impact. Therefore, the purpose of this study was to examine the current rates of AC and factors associated with AC among K-12 educators. Methods. A volunteer sample of K-12 educators ( was recruited to participate in an online survey. Participants responded about AC patterns and social ecological influences on AC (individual, interpersonal, institutional, community, and environmental factors. -tests and ANOVAs examined trends in AC, and Pearson correlations examined the relationship between AC and dependent variables. Multiple regression analysis determined the relative influence of individual, interpersonal, institutional, community, and environmental levels on AC. Results. Participants actively commuted times/week. There were several individual, interpersonal, institutional, community, and environmental factors significantly related to AC. The full model explained 60.8% of the variance in AC behavior. Conclusions. This study provides insight on the factors that determine K-12 educators mode of commute and provide some insight for employee wellness among this population.

  6. Females and STEM: Determining the K-12 Experiences that Influenced Women to Pursue STEM Fields

    Science.gov (United States)

    Petersen, Anne Marie

    In the United States, careers in the fields of Science, Technology, Engineering, and Mathematics (STEM) are increasing yet there are not enough trained personnel to meet this demand. In addition, of those that seek to pursue STEM fields in the United States, only 26% are female. In order to increase the number of women seeking STEM based bachelor's degrees, K-12 education must provide a foundation that prepares students for entry into these fields. The purpose of this phenomenological study was to determine the perceived K-12 experiences that influenced females to pursue a STEM field. Twelve college juniors or seniors seeking a degree in Biology, Mathematics, or Physics were interviewed concerning their K-12 experiences. These interviews were analyzed and six themes emerged. Teacher passion and classroom characteristics such as incorporating challenging activities played a significant role in the females' decisions to enter STEM fields. Extra-curricular activities such as volunteer and mentor opportunities and the females' need to benefit others also influenced females in their career choice. Both the formal (within the school) and informal (outside of the traditional classroom) pipeline opportunities that these students encountered helped develop a sense of self-efficacy in science and mathematics; this self-efficacy enabled them to persist in pursuing these career fields. Several participants cited barriers that they encountered in K-12 education, but these barriers were primarily internal as they struggled with overcoming self-imposed obstacles in learning and being competitive in the mathematics and science classrooms. The experiences from these female students can be used by K-12 educators to prepare and encourage current female students to enter STEM occupations.

  7. 4-thiouridine and photoprotection in Escherichia coli K12

    International Nuclear Information System (INIS)

    Thomas, Gilles; Favre, Alain

    1977-01-01

    A high level of protection is observed in the Escherichia coli K 12 strain AB 1157 rec A 1 nuv + whose transfer RNA contains 4-thiouridine. In contrast, the photoprotection level is low and observed at higher doses in a strain which differs from the former by a single mutation nuv - , (lack of 4-thiouridine). This nucleoside is therefore an important chromophore leading to photoprotection. This conclusion is corroborated by the similarity of the action spectra for 8-13 link formation in tRNA and for photoprotection [fr

  8. Efficacy of the World Wide Web in K-12 environmental education

    Science.gov (United States)

    York, Kimberly Jane

    1998-11-01

    Despite support by teachers, students, and the American public in general, environmental education is not a priority in U.S. schools. Teachers face many barriers to integrating environmental education into K--12 curricula. The focus of this research is teachers' lack of access to environmental education resources. New educational reforms combined with emerging mass communication technologies such as the Internet and World Wide Web present new opportunities for the infusion of environmental content into the curriculum. New technologies can connect teachers and students to a wealth of resources previously unavailable to them. However, significant barriers to using technologies exist that must be overcome to make this promise a reality. Web-based environmental education is a new field and research is urgently needed. If teachers are to use the Web meaningfully in their classrooms, it is essential that their attitudes and perceptions about using this new technology be brought to light. Therefore, this exploratory research investigates teachers' attitudes toward using the Web to share environmental education resources. Both qualitative and quantitative methods were used to investigate this problem. Two surveys were conducted---self-administered mail survey and a Web-based online survey---to elicit teachers perceptions and comments about environmental education and the Web. Preliminary statistical procedures including frequencies, percentages and correlational measures were performed to interpret the data. In-depth interviews and participant-observation methods were used during an extended environmental education curriculum development project with two practicing teachers to gain insights into the process of creating curricula and placing it online. Findings from the both the mail survey and the Web-based survey suggest that teachers are interested in environmental education---97% of respondents for each survey agreed that environmental education should be taught in K

  9. Using an Interdisciplinary Approach to Enhance Climate Literacy for K-12 Teachers

    Science.gov (United States)

    Hanselman, J. A.; Oches, E. A.; Sliko, J.; Wright, L.

    2014-12-01

    The Next Generation Science Standards (2014) will begin to change how K-12 teachers teach science. Using a scaffolding approach, the standards focus on a depth of knowledge across multiple content areas. This philosophy should encourage inquiry-based teaching methods, provided the teacher has both the knowledge and the confidence to teach the content. Although confidence to teach science is high among secondary science (biology, general science, chemistry) teachers, depth of knowledge may be lacking in certain areas, including climate science. To address this issue, a graduate course in climate science (Massachusetts Colleges Online Course of Distinction award winner) was developed to include inquiry-based instruction, connections to current research, and interdisciplinary approaches to teaching science. With the support of the InTeGrate program (SERC) at Carleton College, a module was developed to utilize cli-fi (climate science present in fictional literature) and related climate data. Graduate students gain an appreciation of scientific communication and an understanding of climate data and its connection to societal issues. In addition, the graduate students also gain the ability to connect interdisciplinary concepts for a deeper understanding of climate science and have the opportunity. By the end of the course, the graduate students use the content learned and the examples of pedagogical tools to develop their own activities in his or her classroom.

  10. Overcoming Constraints of Building Successful Partnerships Incorporating STEM Research Into K-12 Classrooms

    Science.gov (United States)

    Radencic, S.; McNeal, K. S.; Pierce, D.; Hare, D.

    2011-12-01

    resources involving STEM research, inquiry, and technology; implementing STEM graduate research into the classroom; clarifying potential benefits for all involved partners (school districts, teacher, university departments, graduate students and K-12 students); improving management methods; and planning for sustainability of partnerships and resources developed including synergy with other university outreach projects.

  11. How to Get Successfully Involved with K-12 Education

    Science.gov (United States)

    Duncan, D.; Fraknoi, A.; Bennett, M.

    1998-05-01

    Many astronomers now have some involvement in K-12 education, either through their children, through large projects with an education or outreach office, or through an educational component to their own grants. Some may need to incorporate education components into future proposals. For those new to education, it can be difficult to decide how best to use their limited resources without "re-inventing the wheel." Some astronomers are comfortable taking a direct role in the classroom or working with teachers, others prefer developing web-based or printed materials, while still others wouldrather work with local schools of education to enhance the training of future teachers. Which of these roles is most useful? In this session, participants will learn what has worked well in the past, with special attention paid to ways in which astronomers' and physicists' training and instincts may fail them when working in education. Invited teachers will describe their classrooms and how astronomers can be most helpful to them. Sample (successful) activities will be demonstrated, and information given about the wide range of existing astronomy and space-science education programs around the country. A full menu of useful ways that astronomers can get involved will be presented, as well as the organizations and institutions which can help in devising a meaningful education program. Handouts will include a catalog of national astronomy education projects, a list of educational web sites, information about the NASA OSS education brokers and facilitators, examples of successful educational materials, and a listing of roles astronomers have played or could play to enhance K-12 education. Registration is required; see the AAS Education WWW page or email aased@aas.org.

  12. Environmental and genetic factors affecting mutability to aminoglycoside antibiotics among Escherichia coli K12 strains

    Directory of Open Access Journals (Sweden)

    Monteiro A.C.M.

    2003-01-01

    Full Text Available Environmental and genetic factors affecting the in vitro spontaneous mutation frequencies to aminoglycoside resistance in Escherichia coli K12 were investigated. Spontaneous mutation frequencies to kanamycin resistance were at least 100 fold higher on modified Luria agar (L2 plates, when compared to results obtained in experiments carried out with Nutrient agar (NA plates. In contrast to rifampincin, the increased mutability to kanamycin resistance could not be attributed to a mutator phenotype expressed by DNA repair defective strains. Kanamycin mutant selection windows and mutant preventive concentrations on L2 plates were at least fourfold higher than on NA plates, further demonstrating the role of growth medium composition on the mutability to aminoglycosides. Mutability to kanamycin resistance was increased following addition of sorbitol, suggesting that osmolarity is involved on the spontaneous mutability of E. coli K12 strains to aminoglycosides. The spontaneous mutation rates to kanamycin resistance on both L2 and NA plates were strictly associated with the selective antibiotic concentrations. Moreover, mutants selected at different antibiotic concentrations expressed heterogeneous resistance levels to kanamycin and most of them expressing multiple resistance to all tested aminoglycoside antibiotics (gentamicin, neomycin, amykacin and tobramycin. These results will contribute to a better understanding of the complex nature of aminoglycoside resistance and the emergence of spontaneous resistant mutants among E. coli K12 strains.

  13. Barriers in the Physics Pipeline from K-12 to Tenure

    Science.gov (United States)

    Kilburn, Micha

    2016-09-01

    The lack of diversity in physics is a known problem, and yet efforts to change our demographics have only had minor effects during the last decade. I will explain some of the hidden barriers that dissuade underrepresented minorities in becoming physicists using a framework borrowed from sociology, Maslow's hierarchy of needs. I will draw from current research at the undergraduate to faculty levels over a variety of STEM fields that are also addressing a lack of diversity. I will also provide analysis from the Joint Institute for Nuclear Astrophysics Center for the Evolution of Elements (JINA-CEE) outreach programs to understand the likelihood of current K-12 students in becoming physicists. Specifically, I will present results from the pre-surveys from our Art 2 Science Camps (ages 8-14) about their attitudes towards science as well as results from analysis of teacher recommendations for our high school summer program. I will conclude with a positive outlook describing the pipeline created by JINA-CEE to retain students from middle school through college. This work was supported in part by the National Science Foundation under Grant No. PHY-1430152 (JINA Center for the Evolution of the Elements).

  14. K-12 Phenology Lessons for the Phenocam Project

    Science.gov (United States)

    Bennett, K. F.

    2013-12-01

    Phenology is defined as periodic [or annual] life cycles of plants and animals driven by seasonal environmental changes. Climate change impinges a strong effect on phenology, potentially altering the structure and functioning of ecosystems. In the fall of 2011, the Ashburnham-Westminster Regional School District became the first of five schools to join Harvard University's Phenocam Network with the installation of a webcam to monitor phenology (or 'phenocam') at Overlook Middle School in Ashburnham, Massachusetts. Our school district is now part of a network of near-surface remote sensing phenocams that capture and send images of forest, shrub, and grassland vegetation cover at more than 130 diverse sites in North America. Our phenocam provides a digital image every half hour of the mixed forest canopy north from the school, enabling the detection of changes in canopy development, quantified as canopy 'greenness'. As a part of the Phenocam project, students at the K-12 level have expanded the scope of phenological monitoring protocol that is part of the Harvard Forest Schoolyard Ecology Program, Buds, Leaves, and Global Warming. In this protocol, students work with ecologists at Harvard Forest to monitor buds and leaves on schoolyard trees to determine the length of the growing season, giving them the opportunity to be a part of real and important research concerning the critical environmental issue of climate change. Students involved in the Buds, Leaves, and Global Warming study have the opportunity to compare their ground data on budburst, color change, and leaf drop to the phenocam images, as well as to similar forested sites in locations throughout the United States. Lessons have been developed for comparing student data to phenocam images, canopy greenness time series graphs extracted from the images, and satellite data. Lessons addressing map scale and the Urban Heat Island effect will also be available for teachers. This project will greatly enhance the

  15. Investigating the Potential of MOOCs in K-12 Teaching and Learning Environments

    Science.gov (United States)

    Nigh, Jennifer; Pytash, Kristine E.; Ferdig, Richard E.; Merchant, William

    2015-01-01

    The massive open online course (MOOC) is a relatively new concept in K-12 teaching and learning environments. Although significant work has been done with MOOCs since 2008, it has only been recently that MOOCs have been studied with K-12 populations. The purpose of this study was to further examine the motivation of K-12 students enrolled in a…

  16. Interview with Joe Freidhoff: A Bird's-Eye View of K-12 Online Learning

    Science.gov (United States)

    Pourreau, Leslie

    2015-01-01

    The intent of this article is to introduce long-time "Online Learning" readership to the field of K-12 online learning while also providing direction for the K-12 online learning scholars about where the field is going or should be going in terms of meeting the needs of K-12 stakeholders. Recently an interview was conducted with Dr. Joe…

  17. Harnessing Technology to Improve K-12 Education. Discussion Paper 2012-05

    Science.gov (United States)

    Chatterji, Aaron; Jones, Benjamin

    2012-01-01

    Technological progress has consistently driven remarkable advances in the U.S. economy, yet K-12 education sees little technological change compared to other sectors, even as U.S. K-12 students increasingly lag behind students in other nations. This proposal considers how we can take a signature American strength--innovation--and apply it to K-12

  18. K-12 Education Nonprofit Employees' Perceptions of Strategies for Recruiting and Retaining Employees

    Science.gov (United States)

    Byrne, Tara Marie

    2013-01-01

    This qualitative study explored the key reasons individuals who work in K-12 education nonprofit organizations enter the field of K-12 nonprofit education and their motivations for doing so. The purpose of this study was to find new strategies for recruiting and retaining K-12 education nonprofit employees by examining the obstacles that exist to…

  19. Effect of Streptococcus salivarius K12 on the in vitro growth of Candida albicans and its protective effect in an oral candidiasis model.

    Science.gov (United States)

    Ishijima, Sanae A; Hayama, Kazumi; Burton, Jeremy P; Reid, Gregor; Okada, Masashi; Matsushita, Yuji; Abe, Shigeru

    2012-04-01

    Oral candidiasis is often accompanied by severe inflammation, resulting in a decline in the quality of life of immunosuppressed individuals and elderly people. To develop a new oral therapeutic option for candidiasis, a nonpathogenic commensal oral probiotic microorganism, Streptococcus salivarius K12, was evaluated for its ability to modulate Candida albicans growth in vitro, and its therapeutic activity in an experimental oral candidiasis model was tested. In vitro inhibition of mycelial growth of C. albicans was determined by plate assay and fluorescence microscopy. Addition of S. salivarius K12 to modified RPMI 1640 culture medium inhibited the adherence of C. albicans to the plastic petri dish in a dose-dependent manner. Preculture of S. salivarius K12 potentiated its inhibitory activity for adherence of C. albicans. Interestingly, S. salivarius K12 was not directly fungicidal but appeared to inhibit Candida adhesion to the substratum by preferentially binding to hyphae rather than yeast. To determine the potentially anti-infective attributes of S. salivarius K12 in oral candidiasis, the probiotic was administered to mice with orally induced candidiasis. Oral treatment with S. salivarius K12 significantly protected the mice from severe candidiasis. These findings suggest that S. salivarius K12 may inhibit the process of invasion of C. albicans into mucous surfaces or its adhesion to denture acrylic resins by mechanisms not associated with the antimicrobial activity of the bacteriocin. S. salivarius K12 may be useful as a probiotic as a protective tool for oral care, especially with regard to candidiasis.

  20. Cool Science: K-12 Climate Change Art Displayed on Buses

    Science.gov (United States)

    Chen, R. F.; Lustick, D. S.; Lohmeier, J.; Thompson, S. R.

    2015-12-01

    Cool science is an art contest where K12 students create placards (7" x 22") to educate the public about climate change. Students are prompted to create their artwork in response to questions such as: What is the evidence for climate change? How does climate change impact your local community? What can you do to reduce the impacts of climate change? In each of three years, 500-600 student entrees have been submitted from more than 12 school districts across Massachusetts. A panel of judges including scientists, artists, rapid transit representatives, and educators chooses elementary, middle, and high school winners. Winners (6), runners-up (6), and honorable mentions (12) and their families and teachers are invited to an annual Cool Science Award Ceremony to be recognized and view winning artwork. All winning artwork is posted on the Cool Science website. The winning artwork (2 per grade band) is converted into placards (11" x 28") and posters (2.5' x 12') that are placed on the inside (placards) and outside (posters) of buses. Posters are displayed for one month. So far, Cool Science was implemented in Lowell, MA where over 5000 public viewers see the posters daily on the sides of Lowell Rapid Transit Authority (LRTA) buses, making approximately 1,000,000 impressions per year. Cool Science acts to increase climate literacy in children as well as the public, and as such promotes intergenerational learning. Using art in conjunction with science learning about climate change appears to be effective at engaging not just traditionally high achieving science students, but also those interested in the creative arts. Hearing winners' stories about how they created their artwork and what this contest meant to them supports the idea that Cool Science attracts a wide diversity of students. Parents discuss climate change with their children. Multiple press releases announcing the winners further promotes the awareness of climate change throughout school districts and their

  1. Sense and Sensibility: The Case for the Nationwide Inclusion of Engineering in the K-12 Curriculum

    Science.gov (United States)

    Lindberg, Robert E.; Pinelli, Thomas E.; Batterson, James G.

    2008-01-01

    The competitive status of the United States is inextricably linked to innovation just as innovation is inseparable from science, technology, engineering, and mathematics. To stay competitive in innovation requires that the United States produce a 21st century workforce complete with requisite education, training, skills, and motivation. If we accept a priori that science, technology, engineering, and mathematics education are crucial to competitiveness and innovation and that, in terms of innovation, mathematics, science, and engineering are interdependent, why are mathematics and science uniformly ubiquitous in the K-12 curriculum while engineering is conspicuously absent? We are passionate in our belief that the uniform addition of engineering to the K-12 curriculum will help ensure that the nation has "the right" 21st Century workforce. Furthermore, we believe that a nationwide effort, led by a coalition of engineering academics, practitioners, and societies is required to turn this goal into reality. However, accomplishing this goal necessitates, as we are reminded by the title of Jane Austen's timeless novel, "Sense and Sensibility", a workable solution that seeks the "middle ground" between passion and reason. We begin our paper by making two essential points: Engineers are not scientists. Engineering exists separate from science, has its own specialized knowledge community apart from science, and it is largely responsible for many of the most significant advancements and improvements in the quality of our life. Our workable solution requires that K-12 education, nationwide, accommodate the inclusion of engineering as a stand alone curriculum and we offer three reasons to support our position: (1) workforce development, (2) stimulating interest in STEM (science, technology, engineering, and mathematics) courses and careers, and (3) creating a technologically literate society. We conclude with some thoughts on how this important goal can be accomplished.

  2. An evaluation of estimation methods for determining addition in presbyopes

    Directory of Open Access Journals (Sweden)

    Leonardo Catunda Bittencourt

    2013-08-01

    Full Text Available PURPOSE: The optical correction of presbyopia must be handled individually. Our aim was to compare the methods used in addition to the refractive near vision, with the final addition used in presbyopic patients. METHODS: Eighty healthy subjects with a mean age of 49.7 years (range 40 to 60 years were studied. Tentative near additions were determined using four different techniques: one-half amplitude accommodation with minus lenses (AAL; one-third accommodative demand with positive lens (ADL; balanced range of accommodation with minus and positive lenses (BRA and crossed cylinder test with initial myopisation (CCT. The power of the addition was then refined to arrive at the final addition. RESULTS: The mean tentative near additions were lower than the final addition for ADL and BRA addition methods. The mean differences between tentative and final additions were low for all the tests examined (less than 0.25 D. The intervals between the 95% limits of agreement differed substantially and were always higher than ±0.50 D. CONCLUSION: All the methods used displayed similar behavior and provided a tentative addition close to the final addition. The coefficient of agreements (COA detected suggests that every tentative addition should be adjusted according to the particular needs of the patient.

  3. An evaluation of estimation methods for determining addition in presbyopes.

    Science.gov (United States)

    Bittencourt, Leonardo Catunda; Alves, Milton Ruiz; Dantas, Daniel Oliveira; Rodrigues, Pablo Felipe; Santos-Neto, Edson dos

    2013-01-01

    The optical correction of presbyopia must be handled individually. Our aim was to compare the methods used in addition to the refractive near vision, with the final addition used in presbyopic patients. Eighty healthy subjects with a mean age of 49.7 years (range 40 to 60 years) were studied. Tentative near additions were determined using four different techniques: one-half amplitude accommodation with minus lenses (AAL); one-third accommodative demand with positive lens (ADL); balanced range of accommodation with minus and positive lenses (BRA) and crossed cylinder test with initial myopisation (CCT). The power of the addition was then refined to arrive at the final addition. The mean tentative near additions were lower than the final addition for ADL and BRA addition methods. The mean differences between tentative and final additions were low for all the tests examined (less than 0.25 D). The intervals between the 95% limits of agreement differed substantially and were always higher than ±0.50 D. All the methods used displayed similar behavior and provided a tentative addition close to the final addition. The coefficient of agreements (COA) detected suggests that every tentative addition should be adjusted according to the particular needs of the patient.

  4. #TwitterforTeachers: The Implications of Twitter as a Self-Directed Professional Development Tool for K-12 Teachers

    Science.gov (United States)

    Visser, Ryan D.; Evering, Lea Calvert; Barrett, David E.

    2014-01-01

    This mixed-methods study explores how K-12 teachers use Twitter. An online survey was disseminated via Twitter to gauge their usage of, access to, and perceptions of Twitter. The results indicated that teachers highly value Twitter as a means of self-directed professional development. Respondents who reported using Twitter multiple times a day…

  5. Strong-stability-preserving additive linear multistep methods

    KAUST Repository

    Hadjimichael, Yiannis

    2018-02-20

    The analysis of strong-stability-preserving (SSP) linear multistep methods is extended to semi-discretized problems for which different terms on the right-hand side satisfy different forward Euler (or circle) conditions. Optimal perturbed and additive monotonicity-preserving linear multistep methods are studied in the context of such problems. Optimal perturbed methods attain larger monotonicity-preserving step sizes when the different forward Euler conditions are taken into account. On the other hand, we show that optimal SSP additive methods achieve a monotonicity-preserving step-size restriction no better than that of the corresponding nonadditive SSP linear multistep methods.

  6. K-12 Project Management Education: NASA Hunch Projects

    Science.gov (United States)

    Morgan, Joe; Zhan, Wei; Leonard, Matt

    2013-01-01

    To increase the interest in science, technology, engineering, and math (STEM) among high school students, the National Aeronautics and Space Administration (NASA) created the "High Schools United with NASA to Create Hardware" (HUNCH) program. To enhance the experience of the students, NASA sponsored two additional projects that require…

  7. Additive manufacturing method for SRF components of various geometries

    Science.gov (United States)

    Rimmer, Robert; Frigola, Pedro E; Murokh, Alex Y

    2015-05-05

    An additive manufacturing method for forming nearly monolithic SRF niobium cavities and end group components of arbitrary shape with features such as optimized wall thickness and integral stiffeners, greatly reducing the cost and technical variability of conventional cavity construction. The additive manufacturing method for forming an SRF cavity, includes atomizing niobium to form a niobium powder, feeding the niobium powder into an electron beam melter under a vacuum, melting the niobium powder under a vacuum in the electron beam melter to form an SRF cavity; and polishing the inside surface of the SRF cavity.

  8. "Analyzing the Longitudinal K-12 Grading Histories of Entire Cohorts of Students: Grades, Data Driven Decision Making, Dropping out and Hierarchical Cluster Analysis"

    Directory of Open Access Journals (Sweden)

    Alex J. Bowers

    2010-05-01

    Full Text Available School personnel currently lack an effective method to pattern and visually interpret disaggregated achievement data collected on students as a means to help inform decision making. This study, through the examination of longitudinal K-12 teacher assigned grading histories for entire cohorts of students from a school district (n=188, demonstrates a novel application of hierarchical cluster analysis and pattern visualization in which all data points collected on every student in a cohort can be patterned, visualized and interpreted to aid in data driven decision making by teachers and administrators. Additionally, as a proof-of-concept study, overall schooling outcomes, such as student dropout or taking a college entrance exam, are identified from the data patterns and compared to past methods of dropout identification as one example of the usefulness of the method. Hierarchical cluster analysis correctly identified over 80% of the students who dropped out using the entire student grade history patterns from either K-12 or K-8.

  9. The Role of the Mathematics Supervisor in K-12 Education

    Science.gov (United States)

    Greenes, Carole

    2013-01-01

    The implementation of "the Common Core Standards for Mathematics" and the assessments of those concepts, skills, reasoning methods, and mathematical practices that are in development necessitate the updating of teachers' knowledge of content, pedagogical techniques to enhance engagement and persistence, and strategies for responding to…

  10. Physiological Function of Rac Prophage During Biofilm Formation and Regulation of Rac Excision in Escherichia coli K-12

    Science.gov (United States)

    including Escherichia coli, Salmonella spp. and Shigellaspp. Here, we found that rac excision is induced during biofilm formation, and the isogenic...stain without rac is more motile and forms more biofilms in nutrient-rich medium at early stages in E.coli K-12. Additionally, the presence of rac...genes increases cell lysis during biofilm development. In most E. coli strains, rac is integrated into the ttcA gene which encodes a tRNA-thioltransferase

  11. Project BioEYES: Accessible Student-Driven Science for K-12 Students and Teachers.

    Science.gov (United States)

    Shuda, Jamie R; Butler, Valerie G; Vary, Robert; Farber, Steven A

    2016-11-01

    BioEYES, a nonprofit outreach program using zebrafish to excite and educate K-12 students about science and how to think and act like scientists, has been integrated into hundreds of under-resourced schools since 2002. During the week-long experiments, students raise zebrafish embryos to learn principles of development and genetics. We have analyzed 19,463 participating students' pre- and post-tests within the program to examine their learning growth and attitude changes towards science. We found that at all grade levels, BioEYES effectively increased students' content knowledge and produced favorable shifts in students' attitudes about science. These outcomes were especially pronounced in younger students. Having served over 100,000 students, we find that our method for providing student-centered experiences and developing long-term partnerships with teachers is essential for the growth and sustainability of outreach and school collaborations.

  12. Induction of the lambda bacteriophage synthesis in Escherichia coli K 12 by polonium alpha rays

    International Nuclear Information System (INIS)

    Devoret, Raymond

    1958-06-01

    This research thesis reports the study of the inducing action of polonium alpha radiations in Escherichia Coli K 12 by using an external irradiation device. This work comprised the development of a method to spread bacteria in layer with a thickness less than 20 microns, and the measurement of the number of α particles falling on the irradiated surface. This measurement has been performed by using a nuclear emulsion and a simple photographic film. It appears that alpha radiations have an inducing action, and that at most 15 per cent of bacteria can be induced. The comparison of the induction curve with the survival curves of lysogen and sensitive stains shows that there is no abortive induction. Thus, it appears that this inducing action is not due to an indirect effect of the irradiated medium [fr

  13. Perspectives on...Special Collections at ARL Libraries and K-12 Outreach: Current Trends

    Science.gov (United States)

    Visser, Michelle

    2006-01-01

    This article examines the results of a survey sent to Association of Research Libraries (ARL) Special Collections requesting information on outreach to K-12 students. Over half of the respondents work with K-12 and many of those who currently do not are planning to. New pressures and changing philosophies contribute to this trend.

  14. Teacher Perception of Barriers and Benefits in K-12 Technology Usage

    Science.gov (United States)

    Carver, Lin B.

    2016-01-01

    This study explores K-12 teachers' perceptions of the benefits and barriers to technology integration by either teachers or students in K-12 instruction. The sample was composed of 68 students enrolled in online classes in the graduate studies in education department of a small private liberal arts institution in the southeast. Data was collected…

  15. K-12 Online Learning and the Training Needs for School Psychology Practitioners

    Science.gov (United States)

    Tysinger, P. Dawn; Tysinger, Jeff; Diamanduros, Terry; Kennedy, Kathryn

    2013-01-01

    K-12 online learning is growing at an exponential rate in the United States and around the world. Students and teachers are entering and embracing the K-12 online learning environment. Thus, it becomes imperative for school psychologists to follow. In order to offer the most productive learning environment for all students, the services provided…

  16. Physical Education Teacher Educator's Perceptions toward and Understanding of K-12 Online Physical Education

    Science.gov (United States)

    Daum, David N.; Woods, Amelia M.

    2015-01-01

    K-12 online physical education (OLPE) is as an educational opportunity in at least 30 states in the US (NASPE, 2006; 2010; 2012). The purpose of this study was to examine physical education teacher educators' perceptions toward and understanding of K-12 OLPE. Bandura's Social Cognitive Theory (1986) served as the theoretical framework for this…

  17. Educating Tomorrow's Workforce: A Report on the Semiconductor Industry's Commitment to Youth in K-12.

    Science.gov (United States)

    Semiconductor Industry Association, San Jose, CA.

    The U.S. semiconductor industry, now the nation's largest manufacturing industry, displays its commitment to training its current workers and educating future workers by supporting educational efforts on the K-12 level. This catalog describes innovative actions by 16 Semiconductor Industry Association companies to improve education at the K-12

  18. A Framework for Quality K-12 Engineering Education: Research and Development

    Science.gov (United States)

    Moore, Tamara J.; Glancy, Aran W.; Tank, Kristina M.; Kersten, Jennifer A.; Smith, Karl A.; Stohlmann, Micah S.

    2014-01-01

    Recent U.S. national documents have laid the foundation for highlighting the connection between science, technology, engineering and mathematics at the K-12 level. However, there is not a clear definition or a well-established tradition of what constitutes a quality engineering education at the K-12 level. The purpose of the current work has been…

  19. An Exploratory Study on K-12 Teachers' Use of Technology and Multimedia in the Classroom

    Science.gov (United States)

    Martin, Florence; Carr, Marsha L.

    2015-01-01

    21st century has seen new technology and multimedia made available for integration in K-12 classrooms. This exploratory study examines K-12 teachers' use of technology and multimedia in the classroom in two southern counties in the Southeastern United States. The purpose of the study was to answer the following five research questions: 1) What…

  20. Generic vs. Modality-Specific Competencies for K-12 Online and Blended Teaching

    Science.gov (United States)

    Pulham, Emily B.; Graham, Charles R.; Short, Cecil R.

    2018-01-01

    Although research has explored teacher competencies in K-12 blended and online learning, it has not specified which competencies are appropriate to an online or digital medium, which refer to blending in-person with online experiences, or which are generic--applicable in any teaching modality. This article explores selected K-12 online and blended…

  1. Spacemakers: A Leadership Perspective on Curriculum and the Purpose of K-12 Educational Makerspaces

    Science.gov (United States)

    Harron, Jason R.; Hughes, Joan E.

    2018-01-01

    This qualitative research study investigated how educational makerspace leaders, whom we refer to as spacemakers, framed the purpose of the makerspace in K-12 education and how makerspaces support school curriculum. Using interviews with twelve K-12 spacemakers, the study found spacemakers were experienced, self-motivated educators. These leaders…

  2. Development of an Attitude Scale to Assess K-12 Teachers' Attitudes toward Nanotechnology

    Science.gov (United States)

    Lan, Yu-Ling

    2012-01-01

    To maximize the contributions of nanotechnology to this society, at least 60 countries have put efforts into this field. In Taiwan, a government-funded K-12 Nanotechnology Programme was established to train K-12 teachers with adequate nanotechnology literacy to foster the next generation of Taiwanese people with sufficient knowledge in…

  3. Keeping Pace with K-12 Digital Learning: An Annual Review of Policy and Practice. Eleventh Edition

    Science.gov (United States)

    Watson, John; Pape, Larry; Murin, Amy; Gemin, Butch; Vashaw, Lauren

    2014-01-01

    "Keeping Pace with K-12 Digital Learning" (2014) is the 11th in a series of annual reports that began in 2004 that examine the status of K-12 online education across the country. The report provides an overview of the latest policies, practices, and trends affecting online learning programs across all 50 states. It summarizes that at a…

  4. Problem-Based Learning in the Life Science Classroom, K-12

    Science.gov (United States)

    McConnell, Tom; Parker, Joyce; Eberhardt, Janet

    2016-01-01

    "Problem-Based Learning in the Life Science Classroom, K-12" offers a great new way to ignite your creativity. Authors Tom McConnell, Joyce Parker, and Janet Eberhardt show you how to engage students with scenarios that represent real-world science in all its messy, thought-provoking glory. The scenarios prompt K-12 learners to immerse…

  5. Applying the Quadratic Usage Framework to Research on K-12 STEM Digital Learning Resources

    Science.gov (United States)

    Luetkemeyer, Jennifer R.

    2016-01-01

    Numerous policymakers have called for K-12 educators to increase their effectiveness by transforming science, technology, engineering, and mathematics (STEM) learning and teaching with digital resources and tools. In this study we outline the significance of studying pressing issues related to use of digital resources in the K-12 environment and…

  6. An Examination of Ideology among Selected K12 Christian School Superintendents

    Science.gov (United States)

    Dolson, Jimmy L.

    2013-01-01

    This research project focused on explaining the decision making process of K12 Christian school superintendents whose schools belong to the Association of Christian Schools International (ACSI) organization. In spite of their similar religious and philosophical beliefs, ACSI K12 Christian school superintendents differed significantly in…

  7. Virtual Schools: The Changing Landscape of K-12 Education in the U.S.

    Science.gov (United States)

    Toppin, Ian N.; Toppin, Sheila M.

    2016-01-01

    Virtual schools are a growing phenomenon in k-12 education. School systems in almost every state in the United States offer some version of fully online or blended education. It is no longer far-fetched to conclude that if the current trend continues, virtual school enrollments will eclipse those of traditional brick-and-mortar k-12 institutions…

  8. K-12 Teacher Perceptions Regarding the Flipped Classroom Model for Teaching and Learning

    Science.gov (United States)

    Gough, Evan; DeJong, David; Grundmeyer, Trent; Baron, Mark

    2017-01-01

    A great deal of evidence can be cited from higher education literature on the effectiveness of the flipped classroom; however, very little research was discovered on the flipped classroom at the K-12 level. This study examined K-12 teachers' perceptions regarding the flipped classroom and differences in teachers' perceptions based on grade level…

  9. K-12 Teachers' Perceptions of School Policy and Fear of School Violence

    Science.gov (United States)

    Ricketts, Melissa L.

    2007-01-01

    Since the 1990s, schools have focused their attention on policies designed to improve school safety. Most researches on school violence policies have concentrated on the needs of students and administrators. This study investigated the impact of school violence policies on K-12 teachers' fear. Using self-report data from 447 K-12 teachers from a…

  10. Opinions on Computing Education in Korean K-12 System: Higher Education Perspective

    Science.gov (United States)

    Kim, Dae-Kyoo; Jeong, Dongwon; Lu, Lunjin; Debnath, Debatosh; Ming, Hua

    2015-01-01

    The need for computing education in the K-12 curriculum has grown globally. The Republic of Korea is not an exception. In response to the need, the Korean Ministry of Education has announced an outline for software-centric computing education in the K-12 system, which aims at enhancing the current computing education with software emphasis. In…

  11. Exploring Arizona K-12 Virtual Educator Experiences and Perspectives Developing Collaborative Learning Communities

    Science.gov (United States)

    Cross, Deborah Iyron

    2015-01-01

    Arizona Online Instruction (AOI) provided an instructional alternative to nearly fifty thousand K-12 students in Arizona during the 2012-2013 school year. Growth in online education underscores the importance of evolving the role of the K-12 virtual teacher as the human agent (Turvey, 2008) demonstrating social learning theory (Bandura, 1977) by…

  12. Development and maturation of Escherichia coli K-12 biofilms

    DEFF Research Database (Denmark)

    Reisner, A.; Haagensen, J.A.J.; Schembri, Mark

    2003-01-01

    The development and maturation of E. coli biofilms in flow-chambers was investigated. We found that the presence of transfer constitutive IncF plasmids induced biofilm development forming structures resembling those reported for Pseudomonas aeruginosa . The development occurred in a step...... occurred in conjugation pilus proficient plasmid-carrying strains. The final shapes of the expanding structures in the mature biofilm seem to be determined by the pilus configuration, as various mutants affected in the processing and activity of the transfer pili displayed differently structured biofilms....... We further provide evidence that flagella, type 1 fimbriae, curli and Ag43 are all dispensable for the observed biofilm maturation. In addition, our results indicate that cell-to-cell signalling mediated by autoinducer 2 (AI-2) is not required for differentiation of E. coli within a biofilm community...

  13. Development of the Advanced Energy Design Guide for K-12 Schools -- 50% Energy Savings

    Energy Technology Data Exchange (ETDEWEB)

    Bonnema, E.; Leach, M.; Pless, S.; Torcellini, P.

    2013-02-01

    This Technical Support Document (TSD) describes the process and methodology for the development of the Advanced Energy Design Guide for K-12 School Buildings: Achieving 50% Energy Savings Toward a Net Zero Energy Building (AEDG-K12) (ASHRAE et al. 2011a). The AEDG-K12 provides recommendations for achieving 50% whole-building energy savings in K-12 schools over levels achieved by following ANSI/ASHRAE/IESNA Standard 90.1-2004, Energy Standard for Buildings Except Low-Rise Residential Buildings (Standard 90.1-2004) (ASHRAE 2004b). The AEDG-K12 was developed in collaboration with the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE), the American Institute of Architects (AIA), the Illuminating Engineering Society of North America (IES), the U.S. Green Building Council (USGBC), and the U.S. Department of Energy (DOE).

  14. Iron-hydroxamate transport in Escherichia coli K12

    International Nuclear Information System (INIS)

    Prody, C.A.

    1984-01-01

    FhuB mutants, which are deficient in ferrichrome transport, were isolated and characterized. They were found to be deficient in the utilization of all hydroxamate-type siderophores. They were, however, able to transport enterobactin. A number of analogs of hydroxamate-type siderophores were tested for biological activity in E. coli, and about half of these were active. In addition, two rhodotorulic acid analogs were able to supply iron to fhuB mutants. A search for the fhuB gene product, using one and two-dimensional polyacrylamide gels of proteins from fhuB and wild type strains proved fruitless, and it appeared that the fhuB gene product is expressed at a very low level. Therefore, the fhuB gene was subcloned from a plasmid in the Carbon bank onto plasmid vectors containing the E. coli lac UV-5 and tacI promoters as a device to amplify the fhuB gene. One of these recombinant plasmids carried an 8Kb insert which contained both the tonA and fhuB genes. This plasmid synthesized five proteins of molecular weights 78,000, 40,000, 30,000, 24,000, and 13,700 in maxicell strain CSR603. By use of deletions, the approximate order of the genes for these proteins was determined. Although 3 He-ferrichrome is transported into E. coli cells and vesicles, 3 He-ferric rhodotorulate is not, and so the mechanism of transport for these two siderophores must be different. To examine this further, mutants were obtained that could transport ferrichrome but not rhodotorulic acid. These map in the region between tonA and fhuB, and most are able to transport aerobactin, when carrying the ColV plasmid, but not schizokinen

  15. Workshop Results: Teaching Geoscience to K-12 Teachers

    Science.gov (United States)

    Nahm, A.; Villalobos, J. I.; White, J.; Smith-Konter, B. R.

    2012-12-01

    A workshop for high school and middle school Earth and Space Science (ESS) teachers was held this summer (2012) as part of an ongoing collaboration between the University of Texas at El Paso (UTEP) and El Paso Community College (EPCC) Departments of Geological Sciences. This collaborative effort aims to build local Earth science literacy and educational support for the geosciences. Sixteen teachers from three school districts from El Paso and southern New Mexico area participated in the workshop, consisting of middle school, high school, early college high school, and dual credit faculty. The majority of the teachers had little to no experience teaching geoscience, thus this workshop provided an introduction to basic geologic concepts to teachers with broad backgrounds, which will result in the introduction of geoscience to many new students each year. The workshop's goal was to provide hands-on activities illustrating basic geologic and scientific concepts currently used in introductory geology labs/lectures at both EPCC and UTEP to help engage pre-college students. Activities chosen for the workshop were an introduction to Google Earth for use in the classroom, relative age dating and stratigraphy using volcanoes, plate tectonics utilizing the jigsaw pedagogy, and the scientific method as a think-pair-share activity. All activities where designed to be low cost and materials were provided for instructors to take back to their institutions. A list of online resources for teaching materials was also distributed. Before each activity, a short pre-test was given to the participants to gauge their level of knowledge on the subjects. At the end of the workshop, participants were given a post-test, which tested the knowledge gain made by participating in the workshop. In all cases, more correct answers were chosen in the post-test than the individual activity pre-tests, indicating that knowledge of the subjects was gained. The participants enjoyed participating in these

  16. Additive manufacturing of reflective optics: evaluating finishing methods

    Science.gov (United States)

    Leuteritz, G.; Lachmayer, R.

    2018-02-01

    Individually shaped light distributions become more and more important in lighting technologies and thus the importance of additively manufactured reflectors increases significantly. The vast field of applications ranges from automotive lighting to medical imaging and bolsters the statement. However, the surfaces of additively manufactured reflectors suffer from insufficient optical properties even when manufactured using optimized process parameters for the Selective Laser Melting (SLM) process. Therefore post-process treatments of reflectors are necessary in order to further enhance their optical quality. This work concentrates on the effectiveness of post-process procedures for reflective optics. Based on already optimized aluminum reflectors, which are manufactured with a SLM machine, the parts are differently machined after the SLM process. Selected finishing methods like laser polishing, sputtering or sand blasting are applied and their effects quantified and compared. The post-process procedures are investigated on their impact on surface roughness and reflectance as well as geometrical precision. For each finishing method a demonstrator will be created and compared to a fully milled sample and among themselves. Ultimately, guidelines are developed in order to figure out the optimal treatment of additively manufactured reflectors regarding their optical and geometrical properties. Simulations of the light distributions will be validated with the developed demonstrators.

  17. Effect of simulated microgravity on E. coli K12 MG1655 growth and gene expression

    Data.gov (United States)

    National Aeronautics and Space Administration — This study demonstrates simulated microgravity effects on E. coli K 12 MG1655 when grown on LB medium supplemented with glycerol. The results imply that E. coli...

  18. Armed To Learn: Aiming At California K 12 School Gun Policy

    Science.gov (United States)

    2016-03-01

    AIMING AT CALIFORNIA K-12 SCHOOL GUN POLICY by Catherine Wilson Jones March 2016 Thesis Co-Advisors: Kathleen Kiernan John Rollins...Master’s thesis 4. TITLE AND SUBTITLE ARMED TO LEARN: AIMING AT CALIFORNIA K-12 SCHOOL GUN POLICY 5. FUNDING NUMBERS 6. AUTHOR(S) Catherine...gap in viewpoints between gun control advocates who want tighter gun control and constitutionalists who believe as strongly in the Second Amendment

  19. Zero Energy Schools: Designing for the Future: Zero Energy Ready K-12 Schools

    Energy Technology Data Exchange (ETDEWEB)

    Torcellini, Paul A [National Renewable Energy Laboratory (NREL), Golden, CO (United States)

    2017-09-29

    Designing, building, and operating zero energy ready K-12 schools provides benefits for districts, students, and teachers. Optimizing energy efficiency is important in any building, but it's particularly important in K-12 schools. Many U.S. school districts struggle for funding, and improving a school building's energy efficiency can free up operational funds that may then be available for educational and other purposes.

  20. Development of an Attitude Scale to Assess K-12 Teachers' Attitudes toward Nanotechnology

    Science.gov (United States)

    Lan, Yu-Ling

    2012-05-01

    To maximize the contributions of nanotechnology to this society, at least 60 countries have put efforts into this field. In Taiwan, a government-funded K-12 Nanotechnology Programme was established to train K-12 teachers with adequate nanotechnology literacy to foster the next generation of Taiwanese people with sufficient knowledge in nanotechnology. In the present study, the Nanotechnology Attitude Scale for K-12 teachers (NAS-T) was developed to assess K-12 teachers' attitudes toward nanotechnology. The NAS-T included 23 Likert-scale items that can be grouped into three components: importance of nanotechnology, affective tendencies in science teaching, and behavioural tendencies to teach nanotechnology. A sample of 233 K-12 teachers who have participated in the K-12 Nanotechnology Programme was included in the present study to investigate the psychometric properties of the NAS-T. The exploratory factor analysis of this teacher sample suggested that the NAS-T was a three-factor model that explained 64.11% of the total variances. This model was also confirmed by the confirmatory factor analysis to validate the factor structure of the NAS-T. The Cronbach's alpha values of three NAS-T subscales ranged from 0.89 to 0.95. Moderate to strong correlations among teachers' NAS-T domain scores, self-perception of own nanoscience knowledge, and their science-teaching efficacy demonstrated good convergent validity of the NAS-T. As a whole, psychometric properties of the NAS-T indicated that this instrument is an effective instrument for assessing K-12 teachers' attitudes toward nanotechnology. The NAS-T will serve as a valuable tool to evaluate teachers' attitude changes after participating in the K-12 Nanotechnology Programme.

  1. DEVELOPMENT OF TOFU PRODUCTION METHOD WITH PROBIOTIC BACTERIA ADDITION

    Directory of Open Access Journals (Sweden)

    Dorota Zielińska

    2015-06-01

    Full Text Available The aim of the study was to develop a production method for tofu with probiotic bacteria under laboratory conditions. The works included: selection of a strain and tofu production conditions, and a storage test of the manufactured product. It was concluded that the sensory quality of tofu with the addition of different probiotic cultures did not differ significantly (p>0.01, depending on used strains and their mixtures, and the sample quality was comparable to the commercial product. It was observed that the number of Lactobacillus bacteria in study samples was the factor determining the palatability of tofu (r= 0.75. On the other hand, the sensory quality of products was significantly affected by the production method of tofu with the addition of probiotic bacteria. It was concluded that the formation of curds from soy beverage by the addition of CaSO4, followed by inoculation with Lactobacillus casei ŁOCK 0900 at the amount of 9.26 log CFU/g and incubation at temp. of 37C for 2h as well as for 20h are methods recommended for production tofu with regard to sensory qualities of the final product among all tested methods. The number of lactic acid bacteria in studied tofu samples was maintained at the high level (109-1010 CFU/g, and the number of Bifidobacterium animalis ssp lactis BB-12 bacteria did not exceed 103 CFU/g, whereas the number of Lactobacillus bacteria was equal to 108-109 CFU/g. For the period of 15 days of storage of tofu with probiotic bacteria at the temperature of 4C the number of lactic acid bacteria was maintained at the constant level of approx. 109 CFU/g. It was concluded that it is possible to produce tofu with probiotic bacteria that has acceptable sensory characteristics and a high number of lactic acid bacteria, therefore the product could be considered as a functional one.

  2. The Windows to the Universe Project: Using the Internet to Support K-12 Science Education

    Science.gov (United States)

    Gardiner, L.; Johnson, R.; Bergman, J.; Russell, R.; Genyuk, J.; La Grave, M.

    2003-12-01

    The World Wide Web can be a powerful tool for reaching the public as well as students and teachers around the world, supporting both formal and informal science education. The Windows to the Universe Project, initiated in 1995, provides a case study of approaches for the use of the web to support earth and space science education and literacy efforts. Through the use of innovative approaches such as easy to use design, multi-level content, and science concepts presented in a broader background context that includes connections to culture and the humanities, Windows to the Universe is an accessible format for individuals of various ages and learning styles. A large global audience regularly uses the web site to learn about earth and space science as well as related humanities content such as myths from around the world. User surveys show that the site has over 4 millions users per year, 65 percent of which are K-12 teachers and students. Approximately 46 percent of users access the site once per week or more. Recently, we have had the opportunity to expand our efforts while we continue to update existing content based on new scientific findings and events. Earth science content on Windows to the Universe is currently growing with a new geology section and development efforts are underway to expand our space weather content with a new curriculum. Educational games allow users to learn about space in a playful context, and an online journaling tool further integrates literacy into the learning experience. In addition, we are currently translating the entire Windows to the Universe web site into Spanish. We have included educators in the project as co-designers from its inception, and by aggressively utilizing and providing professional development opportunities for teachers, the web site is now used in thousands of classrooms around the world. In the past year we have continued to support K-12 educators by adding to our suite of classroom activities and leading

  3. Correlation of radiation sensitivity and nitrofurantoin sensitivity of Escherichia coli K-12

    International Nuclear Information System (INIS)

    Kloeck, K.

    1981-01-01

    The Uvr- and rec-mutants of E.coli K-12 have been tested with a view to their radiation- and nitrofuration sensitivity. The tests showed that all mutants tested were more radiation- and NF-sensitive than the wild type AB 1157. When the NF-sensitivity had been compared to the UV- and X-ray sensitivity it became obvious that the NF-sensitivity is correlated to the UV-sensitivity. Studies carried out with regard to the time dependence of the NF-effect on E.coli showed that the effect of NF on E. Coli became weaker after about 1 1/2 to 2 hours. That is possibly caused by the fact that the E. coli bacteria succeed in reducing the NF to an inactive form. By means of nitrosoguanidine mutants of E-coli AB 1157 had been induced and by means of the Replicite Plating Method, NF-sensible mutants had been isolated from the plutonium mixture. Among the mutants which had been isolated by this method, 74% had been more UV-sensitive than the wild type and 55% more X-ray sensitive. Thus NF-sensitive mutants have not necessarily to be considered as rec-mutants as there are also uvr-mutants in the mixture. (orig.) [de

  4. Formative evaluation of an adaptive game for engaging learners of programming concepts in K-12

    Directory of Open Access Journals (Sweden)

    Renny S. N. Lindberg

    2018-06-01

    Full Text Available As the global demand for programmers is soaring, several countries have integrated programming into their K-12 curricula. Finding effective ways to engage children in programming education is an important objective. One effective method for this can be presenting learning materials via games, which are known to increase engagement and motivation. Current programming education games often focus on a single genre and offer one-size-fits-all experience to heterogeneous learners. In this study, we presented Minerva, a multi-genre (adventure, action, puzzle game to engage elementary school students in learning programming concepts. The game content is adapted to play and learning styles of the player to personalize the gameplay. We conducted a formative mixed-method evaluation of Minerva with 32 Korean 6th grade students who played the game and compared their learning outcomes with 32 6th grade students who studied the same concepts using handouts. The results indicated that, in terms of retention, learning was equally effective in both groups. Furthermore, the game was shown to facilitate engagement among the students. These results, together with uncovered issues, will guide Minerva’s further development.

  5. Enzymatic induction of DNA double-strand breaks in γ-irradiated Escherichia coli K-12

    International Nuclear Information System (INIS)

    Bonura, T.; Smith, K.C.; Kaplan, H.S.

    1975-01-01

    The polA1 mutation increases the sensitivity of E. coli K-12 to killing by γ-irradiation in air by a factor of 2.9 and increases the yield of DNA double-strand breaks by a factor of 2.5. These additional DNA double-strand breaks appear to be due to the action of nucleases in the polA1 strain rather than to the rejoining of radiation-induced double-strand breaks in the pol + strain. This conclusion is based upon the observation that γ-irradiation at 3 0 did not affect the yield of DNA double-strand breaks in the pol + strain, but decreased the yield in the polA1 strain by a factor of 2.2. Irradiation of the polA1 strain at 3 0 followed by incubation at 3 0 for 20 min before plating resulted in approximately a 1.5-fold increase in the D 0 . The yield of DNA double-strand breaks was reduced by a factor of 1.5. The pol + strain, however, did not show the protective effect of the low temperature incubation upon either survival or DNA double-strand breakage. We suggest that the increased yield of DNA double-strand breaks in the polA 1 strain may be the result of the unsuccessful excision repair of ionizing radiation-induced dna base damage

  6. Scientific Participation at the Poles: K-12 Teachers in Polar Science for Careers and Classrooms

    Science.gov (United States)

    Crowley, S.; Warburton, J.

    2012-12-01

    PolarTREC (Teachers and Researchers Exploring and Collaborating) is a National Science Foundation (NSF) funded program in which K-12 teachers participate in hands-on field research experiences in the polar regions. PolarTREC highlights the importance of involving teachers in scientific research in regards to their careers as educators and their ability to engage students in the direct experience of science. To date, PolarTREC has placed over 90 teachers with research teams in the Arctic and Antarctic. Published results of our program evaluation quantify the effect of the field experience on the teachers' use of the real scientific process in the classroom, the improvement in science content taught in classrooms, and the use of non-fiction texts (real data and science papers) as primary learning tools for students. Teachers and students both report an increase of STEM literacy in the classroom content, confidence in science education, as well as a markedly broadened outlook of science as essential to their future. Research conducted with science teams affirms that they are achieving broader impacts when PolarTREC teachers are involved in their expeditions. Additionally, they reported that these teachers making vital contributions to the success of the scientific project.

  7. Investigating the criteria and processes used in the selection, implementation, and evaluation of STEM within K-12 education

    Science.gov (United States)

    Delp, Matthew J.

    This study utilized survey research to investigate how school districts within K-12 education select, implement, and evaluate Science, Technology, Engineering, and Mathematics (STEM) programs. Thirty school districts within the Math and Science Collaborative located in Western Pennsylvania participated in this research. In addition to characterizing the STEM programs of the participating school districts, this study also analyzed the alignment of these programs to the components of comprehensive STEM programs and critical approaches to substantiate STEM program implementation as stated in the literature (Augustine, 2005; Bybee, 2010a, 2010b; Carnevale et al., 2011; DeJarnette, 2010; Epstein & Miller, 2011b; Gardner et al., 1983; Hossain & Robinson, 2011, 2012; Kuenzi, 2008). Findings suggest that the primary goal for school districts, as it relates to STEM program implementation, is to influence students' interest and pursuit of STEM-related careers and degrees. In order to achieve this goal, results of this study indicate the focus of STEM program implementation occurs with the greatest frequency at the middle school (grades seven and eight) level, are developed as an adaptation to the curriculum, and are very diverse from one school district to the next. In addition, findings suggest that although school districts maintain they aim to promote careers and degrees in STEM, districts rely on traditional methods of evaluating STEM program implementation (i.e. standardized test scores) and do not track the longitudinal impact their STEM programs as they related to degrees and careers in STEM. Furthermore, results indicate district STEM programs are not aligned to the characteristics of comprehensive STEM programs as defined by the literature. In order to address the misalignment of school district goals and evaluation processes involved in STEM program implementation and the absence of the characteristics commensurate with comprehensive STEM programs, this study has

  8. Developing Partnerships between Higher Education Faculty, K-12 Science Teachers, and School Administrators via MSP initiatives: The RITES Model

    Science.gov (United States)

    Caulkins, J. L.; Kortz, K. M.; Murray, D. P.

    2011-12-01

    The Rhode Island Technology Enhanced Science Project (RITES) is a NSF-funded Math and Science Partnership (MSP) project that seeks to improve science education. RITES is, at its core, a unique partnership that fosters relationships between middle and high school science teachers, district and school administrators, higher education (HE) faculty members, and science education researchers. Their common goal is to enhance scientific inquiry, increase classroom technology usage, and improve state level science test scores. In one of the more visible examples of this partnership, middle and high school science teachers work closely with HE science faculty partners to design and teach professional development (PD) workshops. The PD sessions focus on technology-enhanced scientific investigations (e.g. use of probes, online simulations, etc.), exemplify inquiry-based instruction, and relate expert content knowledge. Teachers from these sessions express substantial satisfaction in the program, report increased comfort levels in teaching the presented materials (both via post-workshop surveys), and show significant gains in content knowledge (via pre-post assessments). Other benefits to this kind of partnership, in which K-12 and HE teachers are considered equals, include: 1) K-12 teachers are empowered through interactions with HE faculty and other science teachers in the state; 2) HE instructors become more informed not only about good pedagogical practices, but also practical aspects of teaching science such as engaging students; and 3) the PD sessions tend to be much stronger than ones designed and presented solely by HE scientists, for while HE instructors provide content expertise, K-12 teachers provide expertise in K-12 classroom practice and implementation. Lastly, the partnership is mutually beneficial for the partners involved because both sides learn practical ways to teach science and inquiry at different levels. In addition to HE faculty and K-12 science teacher

  9. Preliminary pediatric clinical evaluation of the oral probiotic Streptococcus salivarius K12 in preventing recurrent pharyngitis and/or tonsillitis caused by Streptococcus pyogenes and recurrent acute otitis media

    Directory of Open Access Journals (Sweden)

    Di Pierro F

    2012-11-01

    Full Text Available Francesco Di Pierro,1 Guido Donato,2 Federico Fomia,3 Teresa Adami,4 Domenico Careddu,5 Claudia Cassandro,6 Roberto Albera61Scientific Department, Velleja Research, Milano, 2ASL 1, Cuneo, 3ASL 3, Brescia, 4Infective Diseases, Verona, 5ASL 13, Novara, 6Surgical Science Department, Università degli Studi, Torino, ItalyBackground: The oral probiotic Streptococcus salivarius K12 has been shown clearly to antagonize the growth of Streptococcus pyogenes, the most important bacterial cause of pharyngeal infections in humans, by releasing two bacteriocins named salivaricin A2 and salivaricin B. Unpublished observations indicate that it can also antagonize the growth of other bacteria involved in acute otitis media. Because of its ability to colonize the oral cavity and its safety profile, we have tested its efficacy in reducing the incidence of streptococcal pharyngitis and/or tonsillitis and episodes of acute otitis media.Methods: We enrolled 82 children, including 65 with and 17 without a recent diagnosis of recurrent oral streptococcal pathology. Of those with recurrent pathology, 45 were treated daily for 90 days with an oral slow-release tablet containing five billion colony-forming units of S. salivarius K12 (Bactoblis®, and the remaining 20 served as an untreated control group. The 17 children without a recent diagnosis of recurrent oral pathology were used as an additional control group. After 90 days of treatment, a 6-month follow-up period without treatment was included to evaluate a possible persistent protective role for the previously administered product.Results: The 41 children who completed the 90-day course of Bactoblis showed a reduction in their episodes of streptococcal pharyngeal infection (about 90% and/or acute otitis media (about 40%, calculated by comparing infection rates in the previous year. The 90-day treatment also reduced the reported incidence of pharyngeal and ear infections by about 65% in the 6-month follow-up period

  10. STEM professional volunteers in K-12 competition programs: Educator practices and impact on pedagogy

    Science.gov (United States)

    Zintgraff, Alfred Clifton

    This mixed methods dissertation study explored how secondary school educators in specific K-12 competition programs recruited and deployed STEM professional volunteers. The study explored which practices were viewed as most important, and how practices related to constructivist pedagogy, all from the viewpoint of educators. The non-positivist approach sought new knowledge without pursuing generalized results. Review of the literature uncovered extensive anecdotal information about current practices, and suggested that large investments are made in engaging volunteers. One National Science Foundation-sponsored study was identified, and its recommendations for a sustained research agenda were advanced. Three study phases were performed, one to explore practices and operationalize definitions, a second to rate practice's importance and their relation to pedagogy, and a third to seek explanations. Educators preferred recruiting local, meaning recruiting parents and former students, versus from industry or other employers. Most educators preferred volunteers with mentoring skills, and placing them in direct contact with students, versus deploying volunteers to help with behind-the-scenes tasks supporting the educator. Relationships were identified between the highest-rated practices and constructivism in programs. In STEM professional volunteers, educators see affordances, in the same way a classroom tool opens affordances. A model is proposed which shows educators considering practicality, pedagogy, knowledge and skills, and rapport when accessing the affordances opened by STEM professional volunteers. Benefits are maximized when programs align with strong industry clusters in the community.

  11. Engineering design skills coverage in K-12 engineering program curriculum materials in the USA

    Science.gov (United States)

    Chabalengula, Vivien M.; Mumba, Frackson

    2017-11-01

    The current K-12 Science Education framework and Next Generation Science Standards (NGSS) in the United States emphasise the integration of engineering design in science instruction to promote scientific literacy and engineering design skills among students. As such, many engineering education programmes have developed curriculum materials that are being used in K-12 settings. However, little is known about the nature and extent to which engineering design skills outlined in NGSS are addressed in these K-12 engineering education programme curriculum materials. We analysed nine K-12 engineering education programmes for the nature and extent of engineering design skills coverage. Results show that developing possible solutions and actual designing of prototypes were the highly covered engineering design skills; specification of clear goals, criteria, and constraints received medium coverage; defining and identifying an engineering problem; optimising the design solution; and demonstrating how a prototype works, and making iterations to improve designs were lowly covered. These trends were similar across grade levels and across discipline-specific curriculum materials. These results have implications on engineering design-integrated science teaching and learning in K-12 settings.

  12. The Engaged Microbiologist: Bringing the Microbiological Sciences to the K-12 Community.

    Science.gov (United States)

    Westenberg, David J

    2016-03-01

    Exposing K-12 students to cutting edge science that impacts their daily lives can bring classroom lessons to life. Citizen-science projects are an excellent way to bring high-level science to the classroom and help satisfy one of the cornerstone concepts of the Next Generation Science Standards (NGSS), "engaging in practices that scientists and engineers actually use." This can be a daunting task for teachers who may lack the background or resources to integrate these projects into the classroom. This is where scientific societies such as the American Society for Microbiology (ASM) can play a critical role. ASM encourages its members to engage with the K-12 community by providing networking opportunities and resources for ASM members and K-12 teachers to work together to bring microbiology into the classroom. Journal of Microbiology & Biology Education.

  13. The K-12 Educational Technology Value Chain: Apps for Kids, Tools for Teachers and Levers for Reform

    Science.gov (United States)

    Pierce, Glenn L.; Cleary, Paul F.

    2016-01-01

    Historically implementing, maintaining and managing educational technology has been difficult for K-12 educational systems. Consequently, opportunities for significant advances in K-12 education have often gone unrealized. With the maturation of Internet delivered services along with K-12 institutional trends, educational technologies are poised…

  14. Distance education: Physics through the University of South Carolina for pre-service and in-service K-12 teachers

    Science.gov (United States)

    Safko, John L.; Edge, Ronald D.

    1997-03-01

    For the past several years (10 years for JLS, 3 years for RDE) we have been offering telecommunications-based distance education for K-12 teachers through our Office of Distance Education. In addition to practicing teachers and those majoring in science education, we also enroll students who are working on their Master's of Art in Teaching. These latter students often have an undergraduate degree in some science and are completing content and methods courses for state certification as a teacher. These courses are delivered by video cassette and written material. The courses offered are a two semester introductory physics course (by JLS) and a one semester course in physics demonstrations and experiments suitable for the elementary/middle/high school with little or no sources of equipment (by RDE). These courses will be described in the next two sections. First, a few comments on the services provided by the Office of Distance Education and Instructional Services. The University of South Carolina has been offering courses by telecommunications instruction since 1972. During that time it has developed excellent support services for the instructor. Currently the university offers courses live over satellite links and by video cassette to over 10,000 students. The office provides recording capabilities as well as taking care of distribution of video and print materials. They coordinate the receipt and return of any assignments and exams and provide student services for questions about enrollment, supplies, and other technical problems versus content questions. Keeping all of this organized is a full time job for many staff.

  15. Assessing the Impact of a Statewide STEM Investment on K-12, Higher Education, and Business/Community STEM Awareness over Time

    Science.gov (United States)

    Sondergeld, Toni A.; Johnson, Carla C.; Walten, Janet B.

    2016-01-01

    Despite monetary and educational investments in science, technology, engineering, and mathematics (STEM) being at record high levels, little attention has been devoted to generating a common understanding of STEM. In addition, working with business, K-12 schools, and/or institutions of higher education to establish a grassroots effort to help…

  16. Advanced Methods for Direct Ink Write Additive Manufacturing

    Energy Technology Data Exchange (ETDEWEB)

    Compel, W. S. [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Lewicki, J. P. [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

    2018-01-24

    Lawrence Livermore National Laboratory is one of the world’s premier labs for research and development of additive manufacturing processes. Out of these many processes, direct ink write (DIW) is arguably one of the most relevant for the manufacture of architected polymeric materials, components and hardware. However, a bottleneck in this pipeline that has largely been ignored to date is the lack of advanced software implementation with respect to toolpath execution. There remains to be a convenient, automated method to design and produce complex parts that is user-friendly and enabling for the realization of next generation designs and structures. For a material to be suitable as a DIW ink it must possess the appropriate rheological properties for this process. Most importantly, the material must exhibit shear-thinning in order to extrude through a print head and have a rapid recovery of its static shear modulus. This makes it possible for the extrudate to be self-supporting upon exiting the print head. While this and other prerequisites narrow the scope of ‘offthe- shelf’ printable materials directly amenable to DIW, the process still tolerates a wide range of potential feedstock materials. These include metallic alloys, inorganic solvent borne dispersions, polymeric melts, filler stabilized monomer compositions, pre-elastomeric feedstocks and thermoset resins each of which requires custom print conditions tailored to the individual ink. As such, an ink perfectly suited for DIW may be prematurely determined to be undesirable for the process if printed under the wrong conditions. Defining appropriate print conditions such as extrusion rate, layer height, and maximum bridge length is a vital first step in validating an ink’s DIW capability.

  17. VISL: A Virtual Ice Sheet Laboratory For Outreach and K-12 Education

    Science.gov (United States)

    Cheng, D. L. C.; Halkides, D. J.; Larour, E. Y.; Moore, J.; Dunn, S.; Perez, G.

    2015-12-01

    We present an update on our developing Virtual Ice Sheet Laboratory (VISL). Geared to K-12 classrooms and the general public, VISL's main goal is to improve climate literacy, especially in regards to the crucial role of the polar ice sheets in Earth's climate and sea level. VISL will allow users to perform guided experiments using the Ice Sheet System Model (ISSM), a state-of-the-art ice flow model developed at NASA's Jet Propulsion Laboratory and UC Irvine that simulates the near-term evolution of the ice sheets on Greenland and Antarctica. VISL users will access ISSM via a graphical interface that can be launched from a web browser on a computer, tablet or smart phone. Users select climate conditions and run time by moving graphic sliders then watch how a given region evolves in time under those conditions. Lesson plans will include conceptual background, instructions for table top experiments related to the concepts addressed in a given lesson, and a guide for performing model experiments and interpreting their results. Activities with different degrees of complexity will aim for consistency with NGSS Physical Science criteria for different grade bands (K-2, 3-5, 6-8, and 9-12), although they will not be labeled as such to encourage a broad user base. Activities will emphasize the development of physical intuition and critical thinking skills, understanding conceptual and computational models, as well as observation recording, concept articulation, hypothesis formulation and testing, and mathematical analysis. At our present phase of development, we seek input from the greater science education and outreach communities regarding VISL's planned content, as well as additional features and topic areas that educators and students would find useful.

  18. 3-D Teaching of Climate Change: An innovative professional learning model for K-12 teachers

    Science.gov (United States)

    Stapleton, M.; Wolfson, J.; Sezen-Barrie, A.

    2017-12-01

    In spite of the presumed controversy over the evidence for climate change, the recently released Next Generation Science Standards (NGSS) for K-12 include a focus on climate literacy and explicitly use the term `climate change.' In addition to the increased focus on climate change, the NGSS are also built upon a new three dimensional framework for teaching and learning science. Three dimensional learning has students engaging in scientific and engineering practices (Dimension 1), while using crosscutting concepts (Dimension 2) to explore and explain natural phenomena using disciplinary core ideas (Dimension 3). The adoption of these new standards in many states across the nation has created a critical need for on-going professional learning as in-service science educators begin to implement both climate change instruction and three dimensional teaching and learning in their classrooms. In response to this need, we developed an innovative professional learning model for preparing teachers to effectively integrate climate change into their new curriculum and engage students in three dimensional learning. Our professional learning model utilized ideas that have emerged from recent science education research and include: a) formative assessment probes for three dimensional learning that monitor students' progress; b) collaboration with scientists with expertise in climate science to understand the domain specific ways of doing science; and c) development of a community of practice for in-service teachers to provide feedback to each other on their implementation. In this poster presentation, we will provide details on the development of this professional learning model and discuss the affordances and challenges of implementing this type of professional learning experience.

  19. Supercritical CO2 induces marked changes in membrane phospholipids composition in Escherichia coli K12.

    Science.gov (United States)

    Tamburini, Sabrina; Anesi, Andrea; Ferrentino, Giovanna; Spilimbergo, Sara; Guella, Graziano; Jousson, Olivier

    2014-06-01

    Supercritical carbon dioxide (SC-CO2) treatment is one of the most promising alternative techniques for pasteurization of both liquid and solid food products. The inhibitory effect of SC-CO2 on bacterial growth has been investigated in different species, but the precise mechanism of action remains unknown. Membrane permeabilization has been proposed to be the first event in SC-CO2-mediated inactivation. Flow cytometry, high performance liquid chromatography–electrospray ionization–mass spectrometry and NMR analyses were performed to investigate the effect of SC-CO2 treatment on membrane lipid profile and membrane permeability in Escherichia coli K12. After 15 min of SC-CO2 treatment at 120 bar and 35 °C, the majority of bacterial cells dissipated their membrane potential (95 %) and lost membrane integrity, as 81 % become partially permeabilized and 18 % fully permeabilized. Membrane permeabilization was associated with a 20 % decrease in bacterial biovolume and to a strong (>50 %) reduction in phosphatidylglycerol (PG) membrane lipids, without altering the fatty acid composition and the degree of unsaturation of acyl chains. PGs are thought to play an important role in membrane stability, by reducing motion of phosphatidylethanolamine (PE) along the membrane bilayer, therefore promoting the formation of inter-lipid hydrogen bonds. In addition, the decrease in intracellular pH induced by SC-CO2 likely alters the chemical properties of phospholipids and the PE/PG ratio. Biophysical effects of SC-CO2 thus cause a strong perturbation of membrane architecture in E. coli, and such alterations are likely associated with its strong inactivation effect.

  20. The Air Force Academy’s Falcon Telescope Network: An Educational and Research Network for K-12 and Higher Education

    Science.gov (United States)

    Chun, Francis; Tippets, Roger; Della-Rose, Devin J.; Polsgrove, Daniel; Gresham, Kimberlee; Barnaby, David A.

    2015-01-01

    The Falcon Telescope Network (FTN) is a global network of small aperture telescopes developed by the Center for Space Situational Awareness Research in the Department of Physics at the United States Air Force Academy (USAFA). Consisting of commercially available equipment, the FTN is a collaborative effort between USAFA and other educational institutions ranging from two- and four-year colleges to major research universities. USAFA provides the equipment (e.g. telescope, mount, camera, filter wheel, dome, weather station, computers and storage devices) while the educational partners provide the building and infrastructure to support an observatory. The user base includes USAFA along with K-12 and higher education faculty and students. The diversity of the users implies a wide variety of observing interests, and thus the FTN collects images on diverse objects, including satellites, galactic and extragalactic objects, and objects popular for education and public outreach. The raw imagery, all in the public domain, will be accessible to FTN partners and will be archived at USAFA. USAFA cadets use the FTN to continue a tradition of satellite characterization and astronomical research; this tradition is the model used for designing the network to serve undergraduate research needs. Additionally, cadets have led the development of the FTN by investigating observation priority schemes and conducting a 'day-in-the-life' study of the FTN in regards to satellite observations. With respect to K-12 outreach, cadets have provided feedback to K-12 students and teachers through evaluation of first-light proposals. In this paper, we present the current status of the network and results from student participation in the project.

  1. Integrating local environmental research into K-12 science classrooms and the value of graduate student-educator partnerships

    Science.gov (United States)

    Ward, N. D.; Petrik-Finley, R.

    2015-12-01

    Collaboration between researchers and K-12 educators enables an invaluable exchange of teaching philosophies and educational tools. Programs that partner graduate students with K-12 educators serve the dual purpose of training future educators and providing K-12 students with unique opportunities and perspectives. The benefits of this type of partnership include providing students with enhanced educational experiences and positive student-mentor relationships, training STEM graduate students in effective teaching strategies, and providing teachers with a firsthand resource for scientific information and novel educational materials. Many high school students have had little exposure to science beyond the classroom. Frequent interactions with "real-life" scientists can help make science more approachable and is an effective strategy for promoting science as a career. Here I describe my experiences and several lessons designed as a NSK GK-12 fellow. For example, a month-long unit on biogeochemical principles was framed as a crime scene investigation of a fish kill event in Hood Canal, Washington, in which students were given additional pieces of evidence to solve the mystery as they satisfied checkpoints in their understanding of key concepts. The evidence pieces included scientific plots, maps, datasets, and laboratory exercises. A clear benefit of this investigation-style unit is that students were able to learn the material at their individual pace. This structure allowed for a streamlined integration of differentiated materials such as simplified background readings or visual learning aids for struggling students or more detailed news articles and primary literature for more advanced students. Although the NSF GK-12 program has been archived, educators and researchers should pursue new partnerships, leveraging local and state-level STEM outreach programs with the goal of increasing national exposure of the societal benefits of such synergistic activities.

  2. Ultrasonography as a diagnostic method in addition to mammography

    Energy Technology Data Exchange (ETDEWEB)

    Otto, H.; Roer, E.

    1988-05-01

    By using ultrasonography in addition to mammography, experienced diagnosticians essentially enhance the safety of their diagnosis of mammary gland diseases. The same applies to gynecomastia, the condition after plastic surgery, and mastitis.

  3. Impact of Guided Notes on Achievement in K-12 and Special Education Students

    Science.gov (United States)

    Larwin, Karen H.; Dawson, Daniel; Erickson, Matthew; Larwin, David A.

    2012-01-01

    The common practice of using of guided notes in the K-12 and special education classroom is not fully appreciated or understood. In an effort to add to the existing research about this phenomenon, the current investigation expands on previously published research and one previously published meta-analysis that examined the impact of guided notes…

  4. Effects of a Haptic Augmented Simulation on K-12 Students' Achievement and Their Attitudes Towards Physics

    Science.gov (United States)

    Civelek, Turhan; Ucar, Erdem; Ustunel, Hakan; Aydin, Mehmet Kemal

    2014-01-01

    The current research aims to explore the effects of a haptic augmented simulation on students' achievement and their attitudes towards Physics in an immersive virtual reality environment (VRE). A quasi-experimental post-test design was employed utilizing experiment and control groups. The participants were 215 students from a K-12 school in…

  5. Mobile Apps for Reflection in Learning: A Design Research in K-12 Education

    Science.gov (United States)

    Leinonen, Teemu; Keune, Anna; Veermans, Marjaana; Toikkanen, Tarmo

    2016-01-01

    This study takes a design-based research approach to explore how applications designed for mobile devices could support reflection in learning in K-12 education. Use of mobile devices is increasing in schools. Most of the educational apps support single-person use of interactive learning materials, simulations and learning games. Apps designed to…

  6. An Empirical Evaluation of Distance Learning's Effectiveness in the K-12 Setting

    Science.gov (United States)

    Harris-Packer, Jerilyn D.; Ségol, Geneviève

    2015-01-01

    This study evaluated the effect of online instruction on the academic achievement of K--12 students in ten states as measured by the percentage of proficient students in reading and mathematics at the school level. We used publicly available data provided by the Department of Education in Florida, Michigan, Minnesota, Nevada, Ohio, Pennsylvania,…

  7. Exemplar: A Model for Social Studies Curriculum Development in Delaware, K-12.

    Science.gov (United States)

    Delaware State Dept. of Public Instruction, Dover.

    GRADES OR AGES: Grades K-12. SUBJECT MATTER: Social studies. ORGANIZATION AND PHYSICAL APPEARANCE: The subject matter is divided into the following five themes: 1) Man develops within his physical and cultural environment. 2) Man functions within an interdependent society. 3) Man seeks justice and order. 4) Man experiences conflict and change. 5)…

  8. Preparing University Students to Lead K-12 Engineering Outreach Programmes: A Design Experiment

    Science.gov (United States)

    Anthony, Anika B.; Greene, Howard; Post, Paul E.; Parkhurst, Andrew; Zhan, Xi

    2016-01-01

    This paper describes an engineering outreach programme designed to increase the interest of under-represented youth in engineering and to disseminate pre-engineering design challenge materials to K-12 educators and volunteers. Given university students' critical role as facilitators of the outreach programme, researchers conducted a two-year…

  9. Development of a Virtual Technology Coach to Support Technology Integration for K-12 Educators

    Science.gov (United States)

    Sugar, William; van Tryon, Patricia J. Slagter

    2014-01-01

    In an effort to develop a virtual technology coach for K-12 educators, this article analyzed survey results from sixty teachers with regards to specific resources that a technology coach could provide within a virtual environment. A virtual technology coach was proposed as a possible solution to provide continual professional development for…

  10. Technology Integration in K-12 Science Classrooms: An Analysis of Barriers and Implications

    Science.gov (United States)

    Hechter, Richard P.; Vermette, Laurie Anne

    2013-01-01

    This paper examines the barriers to technology integration for Manitoban K-12 inservice science educators (n = 430) based on a 10-item online survey; results are analyzed according to teaching stream using the Technology, Pedagogy, and Content Knowledge (TPACK) framework. Quantitative descriptive statistics indicated that the leading barriers…

  11. Community Engagement in K-12 Tutoring Programs: A Research-Based Guide for Best Practices

    Science.gov (United States)

    Mozolic, Jennifer; Shuster, Julia

    2016-01-01

    This report on historical trends and recent findings in the literature on academic tutoring is the first step in a community-based research collaboration between faculty and students at a small liberal arts college, the local public school district, and a nonprofit foundation that supports public K-12 education. Each year, this nonprofit…

  12. Empowered Intersectionality among Black Female K-12 Leaders: A Transcendental Phenomenological Study

    Science.gov (United States)

    McNeal, Carla

    2017-01-01

    Black female school leaders remain underrepresented as educational leaders in the K-12 context as marginalizing factors persist in the field. The purpose of this transcendental phenomenological study was to explore the lived experiences of Black female school leaders through the lens of intersectionality. For this research study, intersectionality…

  13. Enhancing the Impact of Evidence-Based Publications on K-12 ESL Teacher Practices

    Science.gov (United States)

    Abbott, Marilyn L.; Lee, Kent; Rossiter, Marian J.

    2017-01-01

    The reading of current research-informed publications is an essential component of teacher professional development that has the potential to lead to or reinforce the implementation of effective instructional practices. To our knowledge, no studies have examined kindergarten to grade 12 (K-12) ESL teacher engagement in professional reading related…

  14. Outstanding Science Trade Books for Students K-12: Books Published in 2015

    Science.gov (United States)

    Science and Children, 2016

    2016-01-01

    Science teachers and mentors continue to be challenged to meet the high expectations of "A Framework for K-12 Science Education" and the "Next Generation Science Standards" ("NGSS"). Indeed the "Framework" urges to help learners "[build] progressively more sophisticated explanations of natural…

  15. Cloning and expression of the Escherichia coli K-12 sad gene.

    OpenAIRE

    Marek, L E; Henson, J M

    1988-01-01

    The Escherichia coli K-12 sad gene, which encodes an NAD-dependent succinic semialdehyde dehydrogenase, was cloned into a high-copy-number vector. Minicells carrying a sad+ plasmid produced a 55,000-dalton peptide, the probable sad gene product.

  16. Using the van Hiele K-12 Geometry Learning Theory to Modify Engineering Mechanics Instruction

    Science.gov (United States)

    Sharp, Janet M.; Zachary, Loren W.

    2004-01-01

    Engineering students use spatial thinking when examining diagrams or models to study structure design. It is expected that most engineering students have solidified spatial thinking skills during K-12 schooling. However, according to what we know about geometry learning and teaching, spatial thinking probably needs to be explicitly taught within…

  17. Environmental Education and K-12 Student Outcomes: A Review and Analysis of Research

    Science.gov (United States)

    Ardoin, Nicole M.; Bowers, Alison W.; Roth, Noelle Wyman; Holthuis, Nicole

    2018-01-01

    Many practitioners and researchers describe academic and environmental benefits of environmental education for kindergarten through twelfth grade (K-12) students. To consider the empirical underpinnings of those program descriptions, we systematically analyzed the peer-reviewed literature (1994-2013), focusing on outcomes of environmental…

  18. Standards Based Design: Teaching K-12 Educators to Build Quality Online Courses

    Science.gov (United States)

    Quiroz, René E.; Ritter, Nicola L.; Li, Yun; Newton, Rhonda C.; Palkar, Trupti

    2016-01-01

    The number of online courses, programs, and schools are growing exponentially in K-12 education. Given the unique nature of online courses and the distinct skills necessary to create a quality online course, it is essential that effective professional development be provided for teachers designing online courses. Online courses need to be of the…

  19. What Is (Or Should Be) Scientific Evidence Use in K-12 Classrooms?

    Science.gov (United States)

    McNeill, Katherine L.; Berland, Leema

    2017-01-01

    Research and reform efforts frequently identify evidence as an essential component of science classroom instruction to actively engage students in science practices. Despite this agreement on the primacy of evidence, there is a lack of consensus around what counts as "evidence" in k-12 classrooms (e.g., ages 5-18): scholarship and…

  20. Analysis of 3D Modeling Software Usage Patterns for K-12 Students

    Science.gov (United States)

    Wu, Yi-Chieh; Liao, Wen-Hung; Chi, Ming-Te; Li, Tsai-Yen

    2016-01-01

    In response to the recent trend in maker movement, teachers are learning 3D techniques actively and bringing 3D printing into the classroom to enhance variety and creativity in designing lectures. This study investigates the usage pattern of a 3D modeling software, Qmodel Creator, which is targeted at K-12 students. User logs containing…

  1. Plickers: A Formative Assessment Tool for K-12 and PETE Professionals

    Science.gov (United States)

    Krause, Jennifer M.; O'Neil, Kason; Dauenhauer, Brian

    2017-01-01

    Classroom response systems have become popular in K-12 and higher education settings in recent years in order to gauge student learning. The physical education environment is unique in that it is difficult to manage the technology associated with these systems, and therefore, student assessment can be cumbersome. A free classroom response system…

  2. Blueprint for Incorporating Service Learning: A Basic, Developmental, K-12 Service Learning Typology

    Science.gov (United States)

    Terry, Alice W.; Bohnenberger, Jann E.

    2004-01-01

    Citing the need for a basic, K-12 developmental framework for service learning, this article describes such a model. This model, an inclusive typology of service learning, distinguishes three levels of service learning: Community Service, Community Exploration, and Community Action. The authors correlate this typology to Piaget's cognitive…

  3. Benefits and Pitfalls: Simple Guidelines for the Use of Social Networking Tools in K-12 Education

    Science.gov (United States)

    Huffman, Stephanie

    2013-01-01

    The article will outline a framework for the use of social networking tools in K-12 education framed around four thought provoking questions: 1) what are the benefits and pitfalls of using social networking tools in P-12 education, 2) how do we plan effectively for the use of social networking tool, 3) what role does professional development play…

  4. Curriculum Guide for Music Education, K-12. Bulletin 1978, No. 18.

    Science.gov (United States)

    Alabama State Dept. of Education, Montgomery.

    This curriculum guide contains objectives, activities, and evaluation procedures for a K-12 music education program. It would be useful to anyone responsible for teaching music. The authors believe that music education has the dual obligation of developing the aesthetic sensitivity of all students regardless of their individual levels of musical…

  5. Qatar's K-12 Education Reform Has Achieved Success in Its Early Years. Research Brief

    Science.gov (United States)

    Larson, Judy

    2009-01-01

    To evaluate progress made in the first years of Qatar's implementation of K-12 education reform, RAND analyzed data from school-level observations, national surveys, and national student assessments. The study found that students in the new, Independent schools were performing better than those in Ministry schools, and there was greater student…

  6. How to Launch an Energy Star Energy Efficiency Competition for K-12 Schools

    Science.gov (United States)

    Utebay Kudret; McArthur, Ashley

    2012-01-01

    In recent years, schools have been forced by rising costs and shrinking budgets to stretch their resources further than ever before in order to meet the educational needs of today's students. EPA's ENERGY STAR program helps K-12 schools and districts improve energy efficiency, reduce operating costs and redirect critical resources into the…

  7. Explaining Technology Integration in K-12 Classrooms: A Multilevel Path Analysis Model

    Science.gov (United States)

    Liu, Feng; Ritzhaupt, Albert D.; Dawson, Kara; Barron, Ann E.

    2017-01-01

    The purpose of this research was to design and test a model of classroom technology integration in the context of K-12 schools. The proposed multilevel path analysis model includes teacher, contextual, and school related variables on a teacher's use of technology and confidence and comfort using technology as mediators of classroom technology…

  8. Perceptions and Experiences of K-12 Educational Leaders in Response to the 27 April 2011 Tornadoes

    Science.gov (United States)

    Bishop, William E.; Fifolt, Matthew; Peters, Gary B.; Gurley, D. Keith; Collins, Loucrecia

    2015-01-01

    The purpose of this phenomenological study was to capture first-hand accounts of K-12 educational leaders whose school districts were directly affected by the deadly 27 April 2011 tornadoes in rural Alabama, USA. This study was framed by the literature base of leadership; specifically crisis leadership and resilience theory. Findings are organised…

  9. How Vocational Psychologists Can Make a Difference in K-12 Education

    Science.gov (United States)

    Perry, Justin C.; Shannon, Lisa

    2017-01-01

    In general, vocational psychologists have not been engaged in applied research that demonstrates how career interventions can improve educational problems that matter to relevant decision-makers and stakeholders. This article describes how vocational psychology can make a difference in K-12 education by embracing an interdisciplinary…

  10. Makerspaces: The Next Iteration for Educational Technology in K-12 Schools

    Science.gov (United States)

    Strycker, Jesse

    2015-01-01

    With the continually growing number of computers and mobile devices available in K-12 schools, the need is dwindling for dedicated computer labs and media centers. Some schools are starting to repurpose those facilities into different kinds of exploratory learning environments known as "makerspaces". This article discusses this next…

  11. Tech-Savvy Science Education? Understanding Teacher Pedagogical Practices for Integrating Technology in K-12 Classrooms

    Science.gov (United States)

    Hechter, Richard; Vermette, Laurie Anne

    2014-01-01

    This paper examines the technology integration practices of Manitoban K-12 inservice science educators based on the Technological, Pedagogical, and Content knowledge (TPACK) framework. Science teachers (n = 433) completed a 10-item online survey regarding pedagogical beliefs about technology integration, types of technology used, and how often…

  12. Problem-Based Learning in the Earth and Space Science Classroom, K-12

    Science.gov (United States)

    McConnell, Tom J.; Parker, Joyce; Eberhardt, Janet

    2017-01-01

    If you've ever asked yourself whether problem-based learning (PBL) can bring new life to both your teaching and your students' learning, here's your answer: Yes. This all-in-one guide will help you engage your students in scenarios that represent real-world science in all its messy, thought-provoking glory. The scenarios will prompt K-12 students…

  13. The Chem-E-Car as a Vehicle for Service Learning through K-12 Outreach

    Science.gov (United States)

    Chirdon, William

    2017-01-01

    This article presents the results of combining the American Institute of Chemical Engineers' (AIChE) Chem-E-Car competition activities with engineering outreach to K-12 students in a service-learning course. Survey results are presented to show how the program develops technical skills as well as leadership, teamwork, and communication skills in…

  14. The Preparation of Teacher Candidates for K-12 Online Learning Environments: A Case Study

    Science.gov (United States)

    Williams, Nicole V.

    2015-01-01

    The purpose of this study was to determine how teacher education programs may better prepare teacher candidates to teach in K-12 online learning environments. The primary research question addressed was: What specific knowledge, skills, and dispositions should teacher education programs include in their curriculum to better prepare teacher…

  15. Commercially Available or Home-Grown: A Cost-Effectiveness Analysis of K-12 Online Courses

    Science.gov (United States)

    Proffitt, Susan

    2014-01-01

    Online learning in K-12 education is becoming a familiar option for students. By the end of 2011, all 50 states and the District of Columbia offered some form of online learning as an option for some students (Watson, Murin, Vashaw, Gemin, & Rapp, 2011). Online courses are appealing to students for a variety of reasons. The five most common…

  16. Peer Mentoring and Peer Tutoring among K-12 Students: A Literature Review

    Science.gov (United States)

    Goodrich, Andrew

    2018-01-01

    The purpose of this literature review is to examine research on peer mentoring among K-12 students to assist practitioners with how to incorporate these instructional techniques into their own music programs. Primary themes across the music education literature of peer mentoring include the role of music teachers, the role of students as they…

  17. Integrating Emerging Technologies in Teaching Ugandan Traditional Dances in K-12 Schools in New York City

    Science.gov (United States)

    Mabingo, Alfdaniels

    2015-01-01

    Schools in New York City have made attempts to embrace and support the strand of "making connections", which is laid out in the New York City Department of Dance blueprint for teaching and learning in dance for grades PreK-12. Accordingly, some schools have integrated Ugandan traditional dances into the dance curriculum, and dance…

  18. Engineering Design Skills Coverage in K-12 Engineering Program Curriculum Materials in the USA

    Science.gov (United States)

    Chabalengula, Vivien M.; Mumba, Frackson

    2017-01-01

    The current "K-12 Science Education framework" and "Next Generation Science Standards" (NGSS) in the United States emphasise the integration of engineering design in science instruction to promote scientific literacy and engineering design skills among students. As such, many engineering education programmes have developed…

  19. A Nonverbal Language for Imagining and Learning: Dance Education in K-12 Curriculum

    Science.gov (United States)

    Hanna, Judith Lynne

    2008-01-01

    Curriculum theorists have provided a knowledge base concerning aesthetics, agency, creativity, lived experience, transcendence, learning through the body, and the power of the arts to engender visions of alternative possibilities in culture, politics, and the environment. However, these theoretical threads do not reveal the potential of K-12 dance…

  20. Are K-12 Learners Motivated in Physical Education? A Meta-Analysis

    Science.gov (United States)

    Chen, Senlin; Chen, Ang; Zhu, Xihe

    2012-01-01

    Previous studies devoted to K-12 learner motivation in physical education share a general assumption that students may lack motivation. This meta-analytic study examined published original studies (n = 79) to determine students' motivation level and the association between motivation and outcomes. Original means of motivation measures were…

  1. Active commuting among K-12 educators: a study examining walking and biking to work.

    Science.gov (United States)

    Bopp, Melissa; Hastmann, Tanis J; Norton, Alyssa N

    2013-01-01

    Walking and biking to work, active commuting (AC) is associated with many health benefits, though rates of AC remain low in the US. K-12 educators represent a significant portion of the workforce, and employee health and associated costs may have significant economic impact. Therefore, the purpose of this study was to examine the current rates of AC and factors associated with AC among K-12 educators. A volunteer sample of K-12 educators (n = 437) was recruited to participate in an online survey. Participants responded about AC patterns and social ecological influences on AC (individual, interpersonal, institutional, community, and environmental factors). t-tests and ANOVAs examined trends in AC, and Pearson correlations examined the relationship between AC and dependent variables. Multiple regression analysis determined the relative influence of individual, interpersonal, institutional, community, and environmental levels on AC. Participants actively commuted 0.51 ± 1.93 times/week. There were several individual, interpersonal, institutional, community, and environmental factors significantly related to AC. The full model explained 60.8% of the variance in AC behavior. This study provides insight on the factors that determine K-12 educators mode of commute and provide some insight for employee wellness among this population.

  2. Jumping the PBL Implementation Hurdle: Supporting the Efforts of K-12 Teachers

    Science.gov (United States)

    Ertmer, Peggy A.; Simons, Krista D.

    2006-01-01

    While problem-based learning (PBL) has a relatively long history of successful use in medical and pre-professional schools, it has yet to be widely adopted by K--12 teachers. This may be due, in part, to the numerous challenges teachers experience when implementing PBL. In this paper, we describe specific hurdles that teachers are likely to…

  3. Restriction alleviation of phage λ in Escherichia Coli K-12 cells after γ-irradiation

    International Nuclear Information System (INIS)

    Rabinkova, E.V.; Torosyan, M.V.; Fradkin, G.E.

    1987-01-01

    In γ-irradiated cells of Escherichia coli K-12 restriction allevation of an unmodified phage λ is only observed in AB1157 strain. No restriction allevation by γ-rays is registered in AB1157 mutants (rec A and ssb-1)

  4. A Survey of K-12 Teachers' Utilization of Social Networks as a Professional Resource

    Science.gov (United States)

    Hunter, Leah J.; Hall, Cristin M.

    2018-01-01

    Teachers are increasingly using social networks, including social media and other Internet applications, to look for educational resources. This study shares results from a survey examining patterns of social network application use among K-12 teachers in the United States. A sample of 154 teachers (18 males, 136 females) in the United States…

  5. California K-12 Schools and Communities Collaborate to Support Student Mental Health

    Science.gov (United States)

    Woodbridge, Michelle W.; Goldweber, Asha; Yu, Jennifer; Golan, Shari; Stein, Bradley D.

    2013-01-01

    Across the education, public health, and human and social services areas, there is renewed interest in bringing agency representatives together to work on the promotion of student mental health and wellness. One of the aims of California's Prevention and Early Intervention (PEI) K-12 Student Mental Health (SMH) initiative funded under Proposition…

  6. Health Education Teacher Resource Handbook: A Practical Guide for K-12 Health Education.

    Science.gov (United States)

    Mahoney, Beverly Saxton, Ed.; Olsen, Larry K., Ed.

    This handbook provides background information on the health curriculum, as well as current, comprehensive information on publications, standards, and special materials for K-12 health education. The manual begins with an introduction, by P. Bruce Uhrmacher, which provides an overview of the ideologies and philosophies that have affected curriculum…

  7. Is K-12 Blended Learning Disruptive? An Introduction to the Theory of Hybrids

    Science.gov (United States)

    Christensen, Clayton M.; Horn, Michael B.; Staker, Heather

    2013-01-01

    The Clayton Christensen Institute for Disruptive Innovation, formerly the Innosight Institute, has published three papers describing the rise of K-12 blended learning--that is, formal education programs that combine online learning and brick-and-mortar schools. This fourth paper is the first to analyze blended learning through the lens of…

  8. Preparing for Online Teaching: Web-Based Assessment and Communication Skills in K12

    Science.gov (United States)

    DeNisco, Alison

    2013-01-01

    Students are doing less hand-raising and more clicking as online classes become increasingly popular in K12 instruction, both in combination with brick-and-mortar classrooms and in independent full-time virtual schools. With online instruction comes a change in the nature of teaching, communicating with, and assessing students. As schools move to…

  9. Examining Student-Adult Relationships during K-12 School Age Years

    Science.gov (United States)

    Lappi, Shelly J.

    2012-01-01

    This study examined the relationship between dependent and independent variables and the effects relationships have on K-12 students as they struggle through life stressors. Thus, the research study was based upon this over arching question: How does having positive student-adult relationships impact a student's ability to cope with life…

  10. iPads in K-12 Schools: A Grounded Theory Study of Value

    Science.gov (United States)

    Townsend, Mary Beth

    2017-01-01

    This qualitative grounded theory study investigated the value of iPads in K-12 schools when used in one-to-one ratios. The purpose of the study was to understand the perspectives of teachers using iPads in one-to-one ratios for teaching and learning in the classroom and administrators responsible for the implementation of these devices. The…

  11. Leading Effective Educational Technology in K-12 School Districts: A Grounded Theory

    Science.gov (United States)

    Hill, Lara Gillian C.

    2011-01-01

    A systematic grounded theory qualitative study was conducted investigating the process of effectively leading educational technology in New Jersey public K-12 school districts. Data were collected from educational technology district leaders (whether formal or non-formal administrators) and central administrators through a semi-structured online…

  12. GIS in the K-12 Classroom: Research Agenda from EDGIS '96

    OpenAIRE

    National Center for Geographic Information and Analysis; National Council for Geographic Education (NCGE); Technical Education Research Centers (TERC)

    1996-01-01

    This meeting of education researchers and teachers immediately followed the November 1996 Annual Meeting of the National Council for Geographic Education (NCGE) in Santa Barbara, California. Participants explored the issues facing the use of Geographic Information Systems (GIS) in the K-12 classroom and developed a research agenda related to Pedagogy Issues, Curriculum Issues, Software Issues, and Cognitive Issues.

  13. Technology-Related Strategies Used by Educational Leaders to Increase Prosocial Behavior in K-12 Schools

    Science.gov (United States)

    Beers, Jason Ronald

    2017-01-01

    Purpose. The purpose of this study was to identify technology-related strategies used by educational leaders to increase prosocial behavior in K-12 schools. Information and communication technology (ICT) is developing at a rapid rate and is becoming more ubiquitous among students. Discovering and understanding common technology-related strategies…

  14. How to Implement Rigorous Computer Science Education in K-12 Schools? Some Answers and Many Questions

    Science.gov (United States)

    Hubwieser, Peter; Armoni, Michal; Giannakos, Michail N.

    2015-01-01

    Aiming to collect various concepts, approaches, and strategies for improving computer science education in K-12 schools, we edited this second special issue of the "ACM TOCE" journal. Our intention was to collect a set of case studies from different countries that would describe all relevant aspects of specific implementations of…

  15. Addressing the NETS*S in K-12 Classrooms: Implications for Teacher Education

    Science.gov (United States)

    Niederhauser, Dale S.; Lindstrom, Denise L.; Strobel, Johannes

    2007-01-01

    The National Educational Technology Standards for Students (NETS*S) were developed to provide guidelines for effective and meaningful technology use with K-12 students. In the present study we used the NETS*S as a framework to analyze ways that teachers integrated instructional technology use and provided opportunities for their students to…

  16. Addressing the Nets for Students through Constructivist Technology Use in K-12 Classrooms

    Science.gov (United States)

    Niederhauser, Dale S.; Lindstrom, Denise L.

    2006-01-01

    The National Educational Technology Standards for Students promote constructivist technology use for K-12 students in U.S. schools. In this study, researchers reported on 716 cases in which teachers described technology-based activities they conducted with their students. Narrative analysis was used to examine case transcripts relative to the…

  17. Integrating the iPod Touch in K-12 Education: Visions and Vices

    Science.gov (United States)

    Banister, Savilla

    2010-01-01

    Advocates of ubiquitous computing have long been documenting classroom benefits of one-to-one ratios of students to handheld or laptop computers. The recent sophisticated capabilities of the iPod Touch, iPhone, and iPad have encouraged further speculation on exactly how K-12 teaching and learning might be energized by such devices. This paper…

  18. An Examination of Dropout Rates for Hispanic or Latino Students Enrolled in Online K-12 Schools

    Science.gov (United States)

    Corry, Michael; Dardick, William; Stella, Julie

    2017-01-01

    As the number of online K-12 educational offerings continues to grow it is important to better understand key indicators of success for students enrolled in these classes. One of those indicators is student dropout rates. This is particularly important for Hispanic or Latino students who traditionally have high dropout rates. The purpose of this…

  19. African Dance Aesthetics in a K-12 Dance Setting: From History to Social Justice

    Science.gov (United States)

    Ward, Sheila A.

    2013-01-01

    This article invites the reader to gain a deeper understanding of the aesthetics of African-based dance through the elements of tradition, transformation, and social justice. A discussion of the aesthetics of African dances within Africa and throughout the African diaspora opens the doors to present these dances in a K-12 setting, to explore a…

  20. Problem-Based Learning in the Physical Science Classroom, K-12

    Science.gov (United States)

    McConnell, Tom J.; Parker, Joyce; Eberhardt, Janet

    2018-01-01

    "Problem-Based Learning in the Physical Science Classroom, K-12" will help your students truly understand concepts such as motion, energy, and magnetism in true-to-life contexts. The book offers a comprehensive description of why, how, and when to implement problem-based learning (PBL) in your curriculum. Its 14 developmentally…

  1. Impact of Adopt-a-Classroom Partnerships between K-12 and University Faculty

    Science.gov (United States)

    Smith, Elizabeth; Kindall, Heather D.; Carter, Vinson; Beachner, Maggie

    2016-01-01

    There is often a disconnect between K-12 schools and postsecondary institutions. While this gap has grown consistently, the need for collaboration between systems is greater than ever. The Adopt-A-Classroom program was created to address the need for greater university faculty involvement in public schools by providing opportunities for…

  2. Job Satisfaction, Organizational Commitment, and Turnover Intention of Online Teachers in the K-12 Setting

    Science.gov (United States)

    Larkin, Ingle M.; Brantley-Dias, Laurie; Lokey-Vega, Anissa

    2016-01-01

    The purpose of this study was to measure and explore factors influencing K-12 online teachers' job satisfaction, organizational commitment, and turnover intentions. Using Maslow's Hierarchy of Needs (1954), Herzberg's Two-Factor Theory of Satisfaction (1959, 1968), Meyer and Allen's measure of Organizational Commitment (1997), and Fishbein and…

  3. Effects of paraquat on Escherichia coli: Differences between B and K-12 strains

    International Nuclear Information System (INIS)

    Kitzler, J.W.; Minakami, H.; Fridovich, I.

    1990-01-01

    Escherichia coli B and K-12 are equally susceptible to the bacteriostatic effects of aerobic paraquat, but they differed strikingly when the lethality of paraquat was evaluated. E. coli B suffered an apparent loss of viability when briefly exposed to paraquat, whereas E. coli K-12 did not. This difference depended on the ability of the B-strain, but not the K-12 strain, to retain internalized paraquat; the B strain was killed on aerobic tryptic soy-yeast extract plates during the incubation which preceded the counting of colonies. This difference in retention of paraquat between strains was demonstrated by delayed loss of viability, by growth inhibition, and by cyanide-resistant respiration after brief exposure to paraquat, washing, and testing in fresh medium. This difference was also shown by using [ 14 C]paraquat. This previously unrecognized difference between E. coli B and K-12 has been the cause of apparently contradictory reports and should lead to some reevaluation of the pertinent literature

  4. Perceptions of Educational Barriers Affecting the Academic Achievement of Latino K-12 Students

    Science.gov (United States)

    Becerra, David

    2012-01-01

    This study examined different factors affecting the perceptions of barriers in academic achievement of Latino K-12 students. The study used data from 1,508 participants who identified themselves as being of Hispanic or Latino heritage in the 2004 National Survey of Latinos: Education, compiled by the Pew Hispanic Center between August 7 and…

  5. Leading by Following: An Analysis of How K-12 School Leaders Use Twitter

    Science.gov (United States)

    Sauers, Nicholas J.; Richardson, Jayson W.

    2015-01-01

    This study analyzed how active Twitter users who are also school leaders used the tool. The researchers collaboratively identified K-12 school leaders who were active on Twitter and then collected tweets from those school leaders. The final sample for this study included 115 Twitter users and over 180,000 tweets from those individuals. The results…

  6. Measurement Invariance of the "Servant Leadership Questionnaire" across K-12 Principal Gender

    Science.gov (United States)

    Xu, Lihua; Stewart, Trae; Haber-Curran, Paige

    2015-01-01

    Measurement invariance of the five-factor "Servant Leadership Questionnaire" between female and male K-12 principals was tested using multi-group confirmatory factor analysis. A sample of 956 principals (56.9% were females and 43.1% were males) was analysed in this study. The hierarchical multi-step measurement invariance test supported…

  7. A Correlational Analysis of Strategic Information Systems Planning in K-12 Public Educational Organizations

    Science.gov (United States)

    Martin, Christopher J.

    2012-01-01

    Three decades of research has indicated that strategic information systems planning is a vital component to business success. The purpose of this study was to identify the relationship strategic information systems planning and financial commitment has within the K-12 public education sector. Data for this study was obtained from top management of…

  8. Increasing Diversity in K-12 School Leadership. Policy Brief 2018-3

    Science.gov (United States)

    Castro, Andrene; Germain, Emily; Gooden, Mark

    2018-01-01

    Principals represent the most "visible" form of leadership in schools, but current workforce data show that K-12 school principals are overwhelmingly white and fail to reflect the diversity within the student population. With increased policy focus on teacher diversity, equal attention must also be directed towards the lack of diversity…

  9. Beyond Concern: K-12 Faculty and Staff's Perspectives on Privacy Topics and Cybersafety

    Science.gov (United States)

    Hipsky, Shellie; Younes, Wiam

    2015-01-01

    In a time when discussions about information privacy dominate the media, research on Cybersafety education reveals that K-12 teachers and staff are concerned about information privacy in schools and they seek to learn more about the protection of their students' and own personal information online. Privacy topics are typically introduced to the…

  10. The Influence of Lean on K-12 District Management: A Case Study

    Science.gov (United States)

    Brown, Beverly

    2011-01-01

    For decades, policymakers and educators have focused on public school equity and adequacy, while paying little attention to efficiency. This qualitative single case study was designed to capture explicit information about Lean management, operations, and culture in a K-12 Michigan school district engaged in Lean training and implementation for a…

  11. After 60 Years, Do the Arguments for K-12 Vouchers Still Hold?

    Science.gov (United States)

    Laitsch, Dan

    2016-01-01

    In 1955, Milton Friedman authored a foundational paper proposing a shift in funding and governance mechanisms for public K-12 schools, suggesting that parents be awarded tuition vouchers that they could use to pay for private sector education services for their children, rather than relying on government provided neighborhood schools. Friedman…

  12. Cisco Networking Academy: Next-Generation Assessments and Their Implications for K-12 Education

    Science.gov (United States)

    Liu, Meredith

    2014-01-01

    To illuminate the possibilities for next-generation assessments in K-12 schools, this case study profiles the Cisco Networking Academy, which creates comprehensive online training curriculum to teach networking skills. Since 1997, the Cisco Networking Academy has served more than five million high school and college students and now delivers…

  13. Teaching and Learning with Mobile Computing Devices: Case Study in K-12 Classrooms

    Science.gov (United States)

    Grant, Michael M.; Tamim, Suha; Brown, Dorian B.; Sweeney, Joseph P.; Ferguson, Fatima K.; Jones, Lakavious B.

    2015-01-01

    While ownership of mobile computing devices, such as cellphones, smartphones, and tablet computers, has been rapid, the adoption of these devices in K-12 classrooms has been measured. Some schools and individual teachers have integrated mobile devices to support teaching and learning. The purpose of this qualitative research was to describe the…

  14. Effects of Mobile Devices on K-12 Students' Achievement: A Meta-Analysis

    Science.gov (United States)

    Tingir, S.; Cavlazoglu, B.; Caliskan, O.; Koklu, O.; Intepe-Tingir, S.

    2017-01-01

    In this meta-analytic study, we investigated the effects of mobile devices on student achievement in science, mathematics and reading in grades K-12. Based on our inclusion criteria, we searched the ERIC and PsycINFO databases and identified 14 peer-reviewed research articles published between 2010 and 2014. We identified the device type, subject…

  15. How Do K-12 Students' Manage Applications on Their Mobile Devices?

    Science.gov (United States)

    Aladjem, Ruthi; Hardof, Sharon

    2016-01-01

    Personal information management (PIM) is a research field that examines the activities by which users save, organize and retrieve personal information items. PIM is a one of the essential new literacies for learners in the 21st century. This paper reports results from a pilot study that explored PIM practices and strategies of K-12 students, on…

  16. An Exploratory Study of the Ascendancy of Women to the Position of K-12 Superintendent

    Science.gov (United States)

    Hanson, Karen M.

    2011-01-01

    Despite earning over half of the doctoral degrees in education, women are underrepresented in the position of K-12 superintendent. In 2000, although 72% of all classroom teachers were female, only 14% of all superintendents in the United States were women. Research indicates that women experience barriers in their ascendancy to superintendent.…

  17. State Capacity to Link K-12/Postsecondary Data Systems and Report Key Indicators

    Science.gov (United States)

    Data Quality Campaign, 2016

    2016-01-01

    The Every Student Succeeds Act (ESSA) provides an opportunity to produce high quality postsecondary indicators and, as available, publicly report them in ways that inform, engage, and empower communities. As first "required" in 2009's American Recovery and Reinvestment Act (ARRA) stimulus law, almost every state has linked its K-12 and…

  18. (Re)Defining the Filipino: Notions of Citizenship in the New K+12 Curriculum

    Science.gov (United States)

    de los Reyes, Elizer Jay

    2013-01-01

    In June 2012, the Philippine government implemented what it called the K+12 Curriculum which reformed its basic education system by adding two more years of schooling to the then existing 10-year structure. Complicated by the long experience and participation of the Filipinos in the diaspora, the constantly lingering thought of leaving for greener…

  19. Battling Obesity in K-12 Learners from an Exercise Physiology Perspective

    Science.gov (United States)

    Rattigan, Peter; Biren, Greg

    2007-01-01

    Physical education practitioners and programs have the opportunity and obligation to help children become physically educated, healthy, and active adults. This article discusses the battle against obesity in K-12 learners from an exercise physiology perspective and focuses on the fact that practitioners have all the tools they need to battle this…

  20. Code to Learn: Where Does It Belong in the K-12 Curriculum?

    Science.gov (United States)

    Moreno-León, Jesús; Robles, Gregorio; Román-González, Marcos

    2016-01-01

    The introduction of computer programming in K-12 has become mainstream in the last years, as countries around the world are making coding part of their curriculum. Nevertheless, there is a lack of empirical studies that investigate how learning to program at an early age affects other school subjects. In this regard, this paper compares three…

  1. Development of Problem Sets for K-12 and Engineering on Pharmaceutical Particulate Systems

    Science.gov (United States)

    Savelski, Mariano J.; Slater, C. Stewart; Del Vecchio, Christopher A.; Kosteleski, Adrian J.; Wilson, Sarah A.

    2010-01-01

    Educational problem sets have been developed on structured organic particulate systems (SOPS) used in pharmaceutical technology. The sets present topics such as particle properties and powder flow and can be integrated into K-12 and college-level curricula. The materials educate students in specific areas of pharmaceutical particulate processing,…

  2. What Do K-12 Teachers Think about Including Student Surveys in Their Performance Ratings?

    Science.gov (United States)

    Dretzke, Beverly J.; Sheldon, Timothy D.; Lim, Alicia

    2015-01-01

    This study investigated K-12 teachers' opinions about the use of student surveys as a component of a teacher evaluation system. Surveys were administered to teachers at the beginning of the school year and again in the spring. Analyses of teachers' responses on the fall survey indicated tentative support for the inclusion of student feedback in…

  3. Tobacco Use Prevention Education. K-12 Lesson Plans from the Montana Model Curriculum for Health Enhancement.

    Science.gov (United States)

    Montana State Office of Public Instruction, Helena.

    This publication presents K-12 tobacco use prevention lesson plans for schools in the state of Montana. Lessons for students in grades K-6 include: family connections; body tracing; smokeless tobacco; prenatal development; tobacco look-alikes; tobacco chemicals; analyzing tobacco and alcohol ads; tobacco use and the lungs; and a personal health…

  4. NSF GK-12 Fellows as Mentors for K-12 Teachers Participating in Field Research Experiences

    Science.gov (United States)

    Ellins, K.; Perry, E.

    2005-12-01

    The University of Texas Institute for Geophysics (UTIG) recognizes the value of providing educational opportunities to K-12 teachers who play a critical role in shaping the minds of young people who are the future of our science. To that end, UTIG established the "Texas Teachers in the Field" program in 2000 to formalize the participation of K-12 teachers in field programs that included UTIG scientists. In 2002, "Texas Teachers in the Field" evolved through UTIG's involvement in a University of Texas at Austin GK-12 project led by the Environmental Sciences Institute, which enabled UTIG to partner a subset of GK-12 Fellows with teachers participating in geophysical field programs. During the three years of the GK-12 project, UTIG successfully partnered four GK-12 Fellows with five K-12 teachers. The Fellows served as mentors to the teachers, as liaisons between UTIG scientists leading field programs and teachers and their students, and as resources in science, mathematics, and technology instruction. Specifically, Fellows prepared teachers and their students for the field investigations, supervised the design of individual Teacher Research Experience (TRE) projects, and helped teachers to develop standards-aligned curriculum resources related to the field program for use in their own classrooms, as well as broader distribution. Although all but one TRE occurred during the school year, Texas school districts and principals were willing to release teachers to participate because the experience and destinations were so extraordinary (i.e., a land-based program in Tierra del Fuego, Argentina; and research cruises to the Southeast Caribbean Sea and Hess Deep in the Pacific Ocean) and carried opportunities to work with scientists from around the world. This exceptional collaboration of GK-12 Fellows, K-12 teachers and research scientists enriches K-12 student learning and promotes greater enthusiasm for science. The level of mentoring, preparation and follow-up provided

  5. Businesses assisting K--12 science instruction: Four case studies of long-term school partnerships

    Science.gov (United States)

    van Trieste, Lynne M.

    Businesses lack enough qualified applicants to fill the increasing need for scientists and engineers while educators lack many resources for science programs in K-12 schools. This series of case studies searched for successful collaborations between the two in four geographic locations: Boise, Idaho; Dallas, Texas; Los Angeles County, California, and Orange County, California. These science education partnerships were investigated to gain an understanding of long-term partnership structure, functioning and evaluation methods. Forty-nine individual interviews with representatives from the groups of stakeholders these programs impact were also conducted. Stakeholder groups included students, teachers, parents, school administrators, business liaisons, and non-profit representatives. Several recurring themes in these partnerships reinforced the existing literature research findings. Collaboration and communication between partners, teacher professional development, the need for more minority and female representation in physical science careers, and self-efficacy in relation to how people come to view their scientific abilities, are among these themes. Topics such as program replication, the importance of role models, programs using "hands-on" activities, reward systems for program participants, and program outcome measurement also emerged from the cases investigated. Third-party assistance by a non-profit entity is occurring within all of these partnerships. This assistance ranges from a service providing material resources such as equipment, lesson plans and meeting space, to managing the partnership fundraising, program development and evaluations. Discussions based upon the findings that support or threaten sustainment of these four partnerships, what a "perfect" partnership might look like, and areas in need of further investigation conclude this study.

  6. The SERC K12 Educators Portal to Teaching Activities and Pedagogic Approaches

    Science.gov (United States)

    Larsen, K.; Kirk, K. B.; Manduca, C. A.; Ledley, T. S.; Schmitt, L.

    2013-12-01

    The Science Education Resource Center (SERC) has created a portal to information for K12 educators to provide high-quality grade level appropriate materials from a wide variety of projects and topics. These materials were compiled across the SERC site, showcasing materials that were created for, or easily adaptable to, K12 classrooms. This resource will help support implementation of Next Generation Science Standards by assisting educators in finding innovative resources to address areas of instruction that are conceptually different than previous national and state science standards. Specifically, the K12 portal assists educators in learning about approaches that address the cross-cutting nature of science concepts, increasing students quantitative reasoning and numeracy skills, incorporating technology such as GIS in the classroom, and by assisting educators of all levels of K12 instruction in using relevant and meaningful ways to teach science concepts. The K12 portal supports educators by providing access to hundreds of teaching activities covering a wide array of science topics and grade levels many of which have been rigorously reviewed for pedagogic quality and scientific accuracy. The portal also provides access to web pages that enhance teaching practices that help increase student's system thinking skills, make lectures interactive, assist instructors in conducting safe and effective indoor and outdoor labs, providing support for teaching energy and climate literacy principles, assisting educators in addressing controversial content, provide guidance in engaging students affective domain, and provides a collection of tools for making teaching relevant in 21st century classrooms including using GIS, Google Earth, videos, visualizations and simulations to model and describe scientific concepts. The portal also provides access to material for specific content and audiences by (1) Supporting AGIs 'Map your World' week to specifically highlight teaching

  7. Using sediment transport and river restoration to link research and education, and promote K-12 female involvement in STEM fields

    Science.gov (United States)

    Yager, E. M.; Bradley-Eitel, K.

    2011-12-01

    The focus of this CAREER award is to better understand and predict the mechanics of sediment transport, to link research and education through courses and shared field sites, and to increase female interest in STEM fields. To accomplish the education component of this proposal we have focused on the following three activities: 1) a Keystone course on the scientific method, 2) a Women Outside with Science (WOWS) camp and 3) a permanent field site for research and education on river processes. In the Keystone Course, students investigated the impact of roughness addition, in sediment-starved river reaches (e.g. downstream of dams), on the retention of gravel used for spawning. They developed research questions and hypotheses, designed and conducted a set of scaled laboratory flume experiments, analyzed their data and wrote a draft manuscript of their results. Student feedback was overwhelmingly positive on the merits of this course, which included hands-on learning of the following: basic sediment transport and fluvial geomorphology, applied statistics, laboratory methods, and scientific writing skills. Students sometimes struggled when flume experiments did not progress as planned, and in the analysis and interpretation of complex data. Some of the students in the course have reanalyzed data, conducted additional experiments and are currently rewriting the manuscript for submission to a peer-reviewed journal. Such a course fundamentally links research and teaching, and provides an introduction to research for advanced undergraduates or beginning graduate students. We have also run one summer WOWS camp, which was a ten day camping and inquiry based research experience for 20 female junior-high and high-school students. The girls studied climate change and water related issues, worked on a restoration project on the Little Salmon River, met with a fish biologist and did fish habitat surveys and studied water quality along the North Fork of the Payette River while on a

  8. Impact of National Physical Activity and Health Guidelines and Documents on Research on Teaching K-12 Physical Education in U.S.A.

    Science.gov (United States)

    Li, Weidong; Xiang, Ping; Gao, Zan; Shen, Bo; Yin, Zhihua; Kong, Qingtao

    2016-01-01

    Purpose: This study examined the impact of published national physical activity (PA) and health guidelines, documents, and initiatives on the evolution of research on teaching K-12 physical education (PE) in U.S.A. from 1996 to October 2013. Methods: A total of 262 peer-reviewed, data-based journal articles meeting our inclusion and exclusion…

  9. Teaching GUI-Programming Concepts to Prospective K12 ICT Teachers: MIT App Inventor as an Alternative to Text-Based Languages

    Science.gov (United States)

    Mihci, Can; Ozdener Donmez, Nesrin

    2017-01-01

    The purpose of this research is to investigate the short and long-term effects of using GUI-oriented visual Blocks-Based Programming languages (BBL) as a 2nd tier tool when teaching programming to prospective K12 ICT teachers. In a mixed-method approach, the effect on academic success as well as the impact on professional opinions and preferences…

  10. Strong-stability-preserving additive linear multistep methods

    KAUST Repository

    Hadjimichael, Yiannis; Ketcheson, David I.

    2018-01-01

    The analysis of strong-stability-preserving (SSP) linear multistep methods is extended to semi-discretized problems for which different terms on the right-hand side satisfy different forward Euler (or circle) conditions. Optimal perturbed

  11. Living in a Materials World: Materials Science Engineering Professional Development for K-12 Educators

    Energy Technology Data Exchange (ETDEWEB)

    Anne Seifert; Louis Nadelson

    2011-06-01

    Advances in materials science are fundamental to technological developments and have broad societal impacs. For example, a cellular phone is composed of a polymer case, liquid crystal displays, LEDs, silicon chips, Ni-Cd batteries, resistors, capacitors, speakers, microphones all of which have required advances in materials science to be compacted into a phone which is typically smaller than a deck of cards. Like many technological developments, cellular phones have become a ubiquitous part of society, and yet most people know little about the materials science associated with their manufacture. The probable condition of constrained knowledge of materials science was the motivation for developing and offering a 20 hour fourday course called 'Living in a Materials World.' In addition, materials science provides a connection between our every day experiences and the work of scientists and engineers. The course was offered as part of a larger K-12 teacher professional development project and was a component of a week-long summer institute designed specifically for upper elementary and middle school teachers which included 20 hour content strands, and 12 hours of plenary sessions, planning, and collaborative sharing. The focus of the institute was on enhancing teacher content knowledge in STEM, their capacity for teaching using inquiry, their comfort and positive attitudes toward teaching STEM, their knowledge of how people learn, and strategies for integrating STEM throughout the curriculum. In addition to the summer institute the participating teachers were provided with a kit of about $300 worth of materials and equipment to use to implement the content they learned in their classrooms. As part of this professional development project the participants were required to design and implement 5 lesson plans with their students this fall and report on the results, as part of the continuing education course associated with the project. 'Living in a

  12. Identification of irradiated food additives by photostimulated luminescence (PSL) method

    International Nuclear Information System (INIS)

    Yun, Hye Jeong; Kwon, Joong Ho; KIm, Dong Ho; Hur, Jung Mu; Yang, Suh Yung; Lee, Byoung Hun

    2008-01-01

    Photostimulated luminescence (PSL), electron spin resonance (ESR) and thermoluminescence (TL) analyses were conducted to detect whether 258 kinds of extracted and powdered forms food additives were irradiated or not. In a view of the PSL results, 9 kinds of the extracted and powdered samples (3.2%) showed over 5,000 photon counts (60 sec) -1 and these samples were judged to be irradiation-positive. Thirty nine kinds of the samples (15.6%) yielded 700-5,000 photon counts (60 sec) -1 and these samples were grouped into irradiation-potential, while the samples showed below 700 photon counts (60 sec) -1 sec were judged to be irradiation-negative. TL glow curves for minerals separated from 5 samples were detected at 150 degrees C with high intensity. However, TL analysis did not apply to other irradiation-positive and irradiation-potential samples because the minerals for TL detection were not separated from the samples. ESR measurements for irradiation-positive and irradiation-potential samples, judged by PSL detection, showed no specific signals to irradiation. The results indicated that PSL could be applied to identify irradiation treatment of extracted and powdered food additives, while TL was optional and ESR was not suitable for detection extracted and powdered food additives

  13. Fast analytical method for the addition of random variables

    International Nuclear Information System (INIS)

    Senna, V.; Milidiu, R.L.; Fleming, P.V.; Salles, M.R.; Oliveria, L.F.S.

    1983-01-01

    Using the minimal cut sets representation of a fault tree, a new approach to the method of moments is proposed in order to estimate confidence bounds to the top event probability. The method utilizes two or three moments either to fit a distribution (the normal and lognormal families) or to evaluate bounds from standard inequalities (e.g. Markov, Tchebycheff, etc.) Examples indicate that the results obtained by the log-normal family are in good agreement with those obtained by Monte Carlo simulation

  14. System and method for high power diode based additive manufacturing

    Energy Technology Data Exchange (ETDEWEB)

    El-Dasher, Bassem S.; Bayramian, Andrew; Demuth, James A.; Farmer, Joseph C.; Torres, Sharon G.

    2018-01-02

    A system is disclosed for performing an Additive Manufacturing (AM) fabrication process on a powdered material forming a substrate. The system may make use of a diode array for generating an optical signal sufficient to melt a powdered material of the substrate. A mask may be used for preventing a first predetermined portion of the optical signal from reaching the substrate, while allowing a second predetermined portion to reach the substrate. At least one processor may be used for controlling an output of the diode array.

  15. System and method for high power diode based additive manufacturing

    Science.gov (United States)

    El-Dasher, Bassem S.; Bayramian, Andrew; Demuth, James A.; Farmer, Joseph C.; Torres, Sharon G.

    2016-04-12

    A system is disclosed for performing an Additive Manufacturing (AM) fabrication process on a powdered material forming a substrate. The system may make use of a diode array for generating an optical signal sufficient to melt a powdered material of the substrate. A mask may be used for preventing a first predetermined portion of the optical signal from reaching the substrate, while allowing a second predetermined portion to reach the substrate. At least one processor may be used for controlling an output of the diode array.

  16. Construction of Escherichia coli K-12 in-frame, single-gene knockout mutants: the Keio collection.

    Science.gov (United States)

    Baba, Tomoya; Ara, Takeshi; Hasegawa, Miki; Takai, Yuki; Okumura, Yoshiko; Baba, Miki; Datsenko, Kirill A; Tomita, Masaru; Wanner, Barry L; Mori, Hirotada

    2006-01-01

    We have systematically made a set of precisely defined, single-gene deletions of all nonessential genes in Escherichia coli K-12. Open-reading frame coding regions were replaced with a kanamycin cassette flanked by FLP recognition target sites by using a one-step method for inactivation of chromosomal genes and primers designed to create in-frame deletions upon excision of the resistance cassette. Of 4288 genes targeted, mutants were obtained for 3985. To alleviate problems encountered in high-throughput studies, two independent mutants were saved for every deleted gene. These mutants-the 'Keio collection'-provide a new resource not only for systematic analyses of unknown gene functions and gene regulatory networks but also for genome-wide testing of mutational effects in a common strain background, E. coli K-12 BW25113. We were unable to disrupt 303 genes, including 37 of unknown function, which are candidates for essential genes. Distribution is being handled via GenoBase (http://ecoli.aist-nara.ac.jp/).

  17. Advanced Energy Design Guide K-12: Next Generation of School Design and Operation

    Energy Technology Data Exchange (ETDEWEB)

    Torcellini, Paul A [National Renewable Energy Laboratory (NREL), Golden, CO (United States); Pless, Shanti [National Renewable Energy Laboratory (NREL), Golden, CO (United States)

    2018-01-01

    Driven by energy efficiency advances and renewable energy cost reductions, zero energy buildings are popping up all around the country. Although zero energy represents a bold paradigm shift - from buildings that consume energy to buildings that produce enough energy to meet their energy needs on an annual basis - it isn't a sudden shift. Zero energy buildings are the result of steady, incremental progress by researchers and building professionals working together to improve building energy performance. ASHRAE is taking the lead by publishing - in partnership with the American Institute of Architects (AIA), the Illuminating Engineering Society (IES), the U.S. Green Building Council (USGBC), and the U.S. Department of Energy (DOE) - a new series of advanced energy design guides (AEDGs) focused on zero energy buildings. The recently completed Advanced Energy Design Guide for K-12 School Buildings: Achieving Zero Energy (K-12 ZE AEDG) is the first in this series.

  18. The landscape of PreK-12 engineering online resources for teachers: global trends

    OpenAIRE

    Bagiati, Aikaterini; Evangelou, Demetra; Magana, Alejandra; Kaloustian, Garene; Zhu, Jiabin; Yoon, So Yoon

    2014-01-01

    Background: The newly formed discipline of engineering education is addressing the need to (a) enhance STEM education for precollege students and (b) identify optimum ways to introduce engineering content starting, perhaps, from the early ages. Introducing engineering at the Prekindergarten through 12th grade (PreK-12) education level requires significant changes in teacher preparation and support. It highlights the need for developing developmentally appropriate content knowledge and ped...

  19. Curricular Value and Instructional Needs for Infusing Engineering Design into K-12 Technology Education

    OpenAIRE

    Gattie, David K.; Wicklein, Robert C.

    2007-01-01

    An overarching objective of Technology Education in the U.S. is to improve technological literacy among K-12 students (DeVore, 1964; Savage and Sterry, 1990; International Technology Education Association, 1996, 2000, 2003). This is addressed in part through a focus on end-product technology and the use and importance of various technologies in society (Savage and Sterry, 1990). While such a focus is certainly necessary, it may not be sufficient if the objective is to infuse engineering into ...

  20. Using Scientific Visualizations to Enhance Scientific Thinking In K-12 Geoscience Education

    Science.gov (United States)

    Robeck, E.

    2016-12-01

    The same scientific visualizations, animations, and images that are powerful tools for geoscientists can serve an important role in K-12 geoscience education by encouraging students to communicate in ways that help them develop habits of thought that are similar to those used by scientists. Resources such as those created by NASA's Scientific Visualization Studio (SVS), which are intended to inform researchers and the public about NASA missions, can be used in classrooms to promote thoughtful, engaged learning. Instructional materials that make use of those visualizations have been developed and are being used in K-12 classrooms in ways that demonstrate the vitality of the geosciences. For example, the Center for Geoscience and Society at the American Geosciences Institute (AGI) helped to develop a publication that outlines an inquiry-based approach to introducing students to the interpretation of scientific visualizations, even when they have had little to no prior experience with such media. To facilitate these uses, the SVS team worked with Center staff and others to adapt the visualizations, primarily by removing most of the labels and annotations. Engaging with these visually compelling resources serves as an invitation for students to ask questions, interpret data, draw conclusions, and make use of other processes that are key components of scientific thought. This presentation will share specific resources for K-12 teaching (all of which are available online, from NASA, and/or from AGI), as well as the instructional principles that they incorporate.

  1. Advanced Energy Retrofit Guide: Practical Ways to Improve Energy Performance, K-12 Schools (Book)

    Energy Technology Data Exchange (ETDEWEB)

    2013-12-01

    The U.S. Department of Energy developed the Advanced Energy Retrofit Guides (AERGs) to provide specific methodologies, information, and guidance to help energy managers and other stakeholders plan and execute energy efficiency improvements. Detailed technical discussion is fairly limited. Instead, we emphasize actionable information, practical methodologies, diverse case studies, and unbiased evaluations of the most promising retrofit energy efficiency measures for each building type. A series of AERGs is under development, addressing key segments of the commercial building stock. K-12 schools were selected as one of the highest priority building sectors, because schools affect the lives of most Americans. They also represent approximately 8% of the energy use and 10% of the floor area in commercial buildings nationwide. U.S. K-12 school districts spend more than $8 billion each year on energy - more than they spend on computers and textbooks combined. Most occupy older buildings that often have poor operational performance - more than 30% of schools were built before 1960. The average age of a school is about 42 years - which is nearly the expected serviceable lifespan of the building. K-12 schools offer unique opportunities for deep, cost-effective energy efficiency improvements, and this guide provides convenient and practical guidance for exploiting these opportunities in the context of public, private, and parochial schools.

  2. CESAME: Providing High Quality Professional Development in Science and Mathematics for K-12 Teachers

    Science.gov (United States)

    Hickman, Paul

    2002-04-01

    It is appropriate that after almost half a century of Science and Mathematics education reform we take a look back and a peek forward to understand the present state of this wonderfully complex system. Each of the components of this system including teaching, professional development, assessment, content and the district K-12 curriculum all need to work together if we hope to provide quality science, mathematics and technology education for ALL students. How do the state and national standards drive the system? How do state policies on student testing and teacher licensure come into play? How do we improve the preparation, retention and job satisfaction of our K-12 teachers? What initiatives have made or are making a difference? What else needs to be done? What can the physics community do to support local efforts? This job is too big for any single organization or individual but we each can contribute to the effort. Our Center at Northeastern University, with support from the National Science Foundation, has a sharply defined focus: to get high quality, research-based instructional materials into the hands of K-12 classroom teachers and provide the support they need to use the materials effectively in their classrooms.

  3. A Method for Fabricating Additive Manufactured Lightweight Metallic Mirrors

    Science.gov (United States)

    2015-06-14

    machinable by diamond turning. It  has added optical advantages such as  temperature  stability,  high  reflectivity, and resistance to  corrosion.  The...manufacturing  cost and lead times are serious limitations. The cost is very  high  because of both the rarity of  beryllium and the  high  toxicity of...beryllium mirrors beyond the typical  isogrid design. One of those methods explores the bonding or  brazing  of aluminum face sheets  to aluminum foams

  4. Monitoring Method of Cutting Force by Using Additional Spindle Sensors

    Science.gov (United States)

    Sarhan, Ahmed Aly Diaa; Matsubara, Atsushi; Sugihara, Motoyuki; Saraie, Hidenori; Ibaraki, Soichi; Kakino, Yoshiaki

    This paper describes a monitoring method of cutting forces for end milling process by using displacement sensors. Four eddy-current displacement sensors are installed on the spindle housing of a machining center so that they can detect the radial motion of the rotating spindle. Thermocouples are also attached to the spindle structure in order to examine the thermal effect in the displacement sensing. The change in the spindle stiffness due to the spindle temperature and the speed is investigated as well. Finally, the estimation performance of cutting forces using the spindle displacement sensors is experimentally investigated by machining tests on carbon steel in end milling operations under different cutting conditions. It is found that the monitoring errors are attributable to the thermal displacement of the spindle, the time lag of the sensing system, and the modeling error of the spindle stiffness. It is also shown that the root mean square errors between estimated and measured amplitudes of cutting forces are reduced to be less than 20N with proper selection of the linear stiffness.

  5. Thinking Like a Scientist: The RITES Path for K-12 Students to Learn the Scientific Method

    Science.gov (United States)

    Murray, D. P.; Dooley, H., Jr.; Cardace, D.

    2015-12-01

    Bringing Research on Learning to the Geosciences (Manduca et al, 2002) stated that "An overaching goal for geoscience education is to help every student to 'think like a scientist'", and that continues to challenge geoscience education. The Rhode Island Technology Enhanced Science (RITES) project addresses that goal, and this presentation chronicles that successful effort. RITES strives to improve science education by providing professional development (PD) to the majority of science teachers at the 5th through 12th grade levels throughout Rhode Island. The PD is presented through ~forty 2.5 day workshops that emphasize the innovative use of technology and best teaching practices, consistent with the recommendations detailed in Manduca et al (2002). The presentation will focus on two of these workshops that provide middle and high school teachers with strategies and techniques for guiding student-run explorations of earthquakes as a result of tectonic plate movements. Teachers address these topics much as a scientist would by carrying out the following activities: 1) Identifying the relationships between faults, EQs and plate boundaries; 2) Using GPS data to quantify interseismic deformation; 3) Constructing an Earthquake machine; and 4) Scaling their observations from desktop to crustal scale, and (5) Using the results to forecast earthquakes along the SAF and to estimate the magnitude of earthquakes on ancient faults. As it is unrealistic to expect teachers to be able to incorporate all of this material into their syllabi, we have introduced the concept of Subtle Shifts (Exploratorium, 2006) as a means by which they can easily blend workshop material into their existing courses. Teacher surveys reflect a high level of satisfaction (81-100%), and pre- and post-evaluations show significant normalized gains (Hake, 1998), in about 90% of the courses. Moreover, students of RITES teachers demonstrate statistically significant gains in inquiry skills and content knowledge.

  6. Apply Deming's Methods to K-12 Curriculum and Improve Student Achievement

    Science.gov (United States)

    Kelly, Thomas F.

    2008-01-01

    The United States has been engaged in school reform for three decades. The federal government as well as all fifty states have passed numerous versions of reform legislation to mandate and regulate the process. Educators have adjusted their practices to the policy created by this legislation. They have also allocated hundreds of billions of…

  7. Induction of the lambda bacteriophage synthesis in Escherichia coli K 12 by polonium alpha rays; Induction de la synthese du bacteriophage lambda chez Escherichia coli K 12 par les rayons alpha du polonium

    Energy Technology Data Exchange (ETDEWEB)

    Devoret, Raymond

    1958-06-15

    This research thesis reports the study of the inducing action of polonium alpha radiations in Escherichia Coli K 12 by using an external irradiation device. This work comprised the development of a method to spread bacteria in layer with a thickness less than 20 microns, and the measurement of the number of α particles falling on the irradiated surface. This measurement has been performed by using a nuclear emulsion and a simple photographic film. It appears that alpha radiations have an inducing action, and that at most 15 per cent of bacteria can be induced. The comparison of the induction curve with the survival curves of lysogen and sensitive stains shows that there is no abortive induction. Thus, it appears that this inducing action is not due to an indirect effect of the irradiated medium [French] Dans ce travail on a etudie l'action inductrice des rayons alphas du polonium chez Escherichia Coli K 12 par un diapoaitif d'irradiation externe. Son utilisation necessitait: - une methode d'etalement des bacteries en couche de moins de 20 microns d'epaisseur; - une mesure du nombre des particules alpha tombant sur la surface etendue irradiee. Les mesures ont ete faites a l'aide d'une emulsion nucleaire et d'un film photographique ordinaire. 1) Les rayons alphas ont une action inductrice. Au plus 15 pc des bacteries peuvent etre induites. 2) La oomparaison de la courbe d'induction et des courbes de survie des souches lysogene et sensible montre qu'il n'y a pas d'inductions abortives. 3) Cette action inductrice n'est pas due a un effet indirect du milieu irradie. (auteur)

  8. Extending the Pathway: Building on a National Science Foundation Workforce Development Project for Underserved k-12 Students

    Science.gov (United States)

    Slattery, W.; Smith, T.

    2014-12-01

    With new career openings in the geosciences expected and a large number of presently employed geoscientists retiring in the next decade there is a critical need for a new cadre of geoscientists to fill these positions. A project funded by the National Science Foundation titled K-12 Students, Teachers, Parents, Administrators and Higher Education Faculty: Partners Helping Rural Disadvantaged Students Stay on the Pathway to a Geoscience Career involving Wright State University and the Ripley, Lewis, Union, Huntington k-12 school district in Appalachian Ohio took led to dozens of seventh and eighth grade students traveling to Sandy Hook, New Jersey for a one week field experience to study oceanography with staff of the New Jersey Sea Grant Consortium. Teachers, parent chaperones, administrators and university faculty accompanied the students in the field. Teachers worked alongside their students in targeted professional development during the weeklong field experience. During the two academic years of the project, both middle school and high school teachers received professional development in Earth system science so that all students, not just those that were on the summer field experience could receive enhanced science learning. All ninth grade high school students were given the opportunity to take a high school/college dual credit Earth system science course. Community outreach provided widespread knowledge of the project and interest among parents to have their children participate. In addition, ninth grade students raised money themselves to fund a trip to the International Field Studies Forfar Field Station on Andros Island, Bahamas to study a tropical aquatic system. Students who before this project had never traveled outside of Ohio are currently discussing ways that they can continue on the pathway to a geoscience career by applying for internships for the summer between their junior and senior years. These are positive steps towards taking charge of their

  9. The steady-state kinetics of the NADH-dependent nitrite reductase from Escherichia coli K 12. Nitrite and hydroxylamine reduction.

    OpenAIRE

    Jackson, R H; Cole, J A; Cornish-Bowden, A

    1981-01-01

    The reduction of both NO2- and hydroxylamine by the NADH-dependent nitrite reductase of Escherichia coli K 12 (EC 1.6.6.4) appears to follow Michaelis-Menten kinetics over a wide range of NADH concentrations. Substrate inhibition can, however, be detected at low concentrations of the product NAD+. In addition, NAD+ displays mixed product inhibition with respect to NADH and mixed or uncompetitive inhibition with respect to hydroxylamine. These inhibition characteristics are consistent with a m...

  10. K-12 Students' Perceptions of Scientists: Finding a Valid Measurement and Exploring Whether Exposure to Scientists Makes an Impact

    Science.gov (United States)

    Hillman, Susan J.; Bloodsworth, Kylie H.; Tilburg, Charles E.; Zeeman, Stephan I.; List, Henrietta E.

    2014-01-01

    This study was launched from a National Science Foundation GK-12 grant in which graduate fellows in Science, Technology, Engineering, and Mathematics (STEM) are placed in classrooms to engage K-12 students in STEM activities. The investigation explored whether the STEM Fellows' presence impacted the K-12 students' stereotypical image of a…

  11. Keeping Pace with K-12 Online & Blended Learning: An Annual Review of Policy and Practice. 10 Year Anniversary Issue

    Science.gov (United States)

    Watson, John; Murin, Amy; Vashaw, Lauren; Gemin, Butch; Rapp, Chris

    2013-01-01

    "Keeping Pace with K-12 Online & Blended Learning" (2013), the 10th in a series of annual reports that began in 2004, examines the status of K-12 online education across the country. The report provides an overview of the latest policies, practices, and trends affecting online learning programs across all 50 states. In this 10th…

  12. Participative Teaching with Mobile Devices and Social Networks for K-12 Children

    Directory of Open Access Journals (Sweden)

    Livia Stefan

    2016-08-01

    Full Text Available This article details a set of participatory pedagogical experiments conducted within a research grant PN II IDEI (”Time Maps. Real communities, virtual worlds, experimented pasts” performed with the purpose of helping rural communities in identifying their cultural heritage andtransmitting it to the younger generations by means of modern IT technologies, including web 2.0. In a Danubian rural community, several points of archaeological interest (POIs were identified, which were then included in a geographic Augmented Reality application for smartphones and tablets. Subsequently, the geographic data were collected from the archaeological site by the K-12 children, under the coordination of an academic staff member of the National University of Arts in Bucharest, and stored on their devices using Google Maps. The augmented information provided onthe site was annotated and shared with other K-12 children, through different social networks sites (SNS and content postings. This first stage experiment was extended to the development of a social learning environment complementary to the educational site (www.timemaps.net to support thetransmission of several traditional technologies (textile, ceramic, glass in a collaborative manner. We consider that our experiments can significantly increase the visibility of the information pertaining to the identity of target places and communities among the younger generation. A mobile-learning paradigm, in combination with web 2.0 technologies, was the support for a distributed and low-cost platform for communication and collaboration. Social networks linked thearchaeological heritage and the academic research with the larger community of rural K-12 children. The article analyzes this platform as a solution for creating, collecting and sharingeducational content, and presents conclusions on using social media for effective blended learning and transmittal of the cultural heritage.

  13. Uvm mutants of Escherichia coli K 12 deficient in UV mutagenesis. Pt. 1

    International Nuclear Information System (INIS)

    Steinborn, G.

    1978-01-01

    Selection for defective reversion induction, after UV treatment of E. coli K 12, yielded uvm mutants. These mutants exhibited highly reduced or no UV mutability for all loci tested although they were moderately and normally mutable by X-rays and EMS, respectively. Uvm mutations confer only a slight sensitivity to killing by UV and X-rays and no clear sensitivity to the lethal effect of HN2, EMS or MMS. Growth and viability of untreated uvm cells were normal. The properties of uvm mutants are discussed in relation to those of other relevant mutant types and to some actual problems of induced mutagenesis. (orig.) 891 AJ [de

  14. Global impact of mature biofilm lifestyle on Escherichia coli K-12 gene expression

    DEFF Research Database (Denmark)

    Beloin, C.; Valle, J.; Latour-Lambert, P.

    2004-01-01

    The formation of biofilm results in a major lifestyle switch that is thought to affect the expression of multiple genes and operons. We used DNA arrays to study the global effect of biofilm formation on gene expression in mature Escherichia coli K-12 biofilm. We show that, when biofilm is compared...... that 20 of these genes are required for the formation of mature biofilm. This group includes 11 genes of previously unknown function. These results constitute a comprehensive analysis of the global transcriptional response triggered in mature E. coli biofilms and provide insights into its physiological...

  15. Ground Truth Studies - A hands-on environmental science program for students, grades K-12

    Science.gov (United States)

    Katzenberger, John; Chappell, Charles R.

    1992-01-01

    The paper discusses the background and the objectives of the Ground Truth Studies (GTSs), an activity-based teaching program which integrates local environmental studies with global change topics, utilizing remotely sensed earth imagery. Special attention is given to the five key concepts around which the GTS programs are organized, the pilot program, the initial pilot study evaluation, and the GTS Handbook. The GTS Handbook contains a primer on global change and remote sensing, aerial and satellite images, student activities, glossary, and an appendix of reference material. Also described is a K-12 teacher training model. International participation in the program is to be initiated during the 1992-1993 school year.

  16. Sustaining K-12 professional development in geology: Recurrent participation in Rockcamp

    Science.gov (United States)

    Repine, T.E.; Hemler, D.A.; Behling, R.E.

    2004-01-01

    A reconnaissance study of the geology professional development program known as RockCamp was initiated to examine the sustained, or recurrent, participation of K-12 science teachers. Open-ended interviews, concept mapping, and creative writing assignments were used to explore the perceptions of six teachers possessing an exceptional record of participation. Efficacy, fun, right time of life, and support emerged as unanimous reasons for recurrent participation. Content, friendship, and methodology were very important. College credit was not critical. These teachers' perceptions suggest their sustained involvement in the RockCamp Program is stimulated by situated learning experiences stressing a compare, contrast, connect, and construct pedagogy within a supportive learning community.

  17. Relevance of DNA repair pathways on ascorbic acid effects on Echerichia Coli K-12 cells

    International Nuclear Information System (INIS)

    Slyus, M.A. van; Oliveira, R.L.B. da C.; Felzenszwalb, I.; Gomes, R.A.; Menck, C.F.

    1985-01-01

    Inactivation kinetics were performed with repair proficient and deficient Escherichia coli K-12 cells treated with oxidized solutions of ascorbic acid. The repair pathways controlled by the recA and uvrA gene products are essential for cell survival to the treatment. However, SOS chromotest result indicates that the SOS functions are only induced at high and toxic concentrations of the drug. Moreover, single strand breaks in DNA from treated cells are detected, demonstrating genome damage promoted by oxidized solutions of ascorbate. (M.A.C.) [pt

  18. Making NASA Earth Observing System Satellite Data Accessible to the K-12 and Citizen Scientist Communities

    Science.gov (United States)

    Moore, Susan W.; Phelps, Carrie S.; Chambers, Lin H.

    2004-01-01

    The Atmospheric Sciences Data Center (ASDC) at NASA s Langley Research Center houses over 700 data sets related to Earth s radiation budget, clouds, aerosols and tropospheric chemistry. These data sets are produced to increase academic understanding of the natural and anthropogenic perturbations that influence global climate change. The Mentoring and inquirY using NASA Data on Atmospheric and earth science for Teachers and Amateurs (MY NASA DATA) project has been established to systematically support educational activities at all levels of formal and informal education by reducing these large data holdings to microsets that will be easily explored and understood by the K-12 and the amateur scientist communities

  19. Code to Learn: Where Does It Belong in the K-12 Curriculum?

    OpenAIRE

    Jesús Moreno León; Gregorio Robles; Marcos Román-González

    2016-01-01

    The introduction of computer programming in K-12 has become mainstream in the last years, as countries around the world are making coding part of their curriculum. Nevertheless, there is a lack of empirical studies that investigate how learning to program at an early age affects other school subjects. In this regard, this paper compares three quasi-experimental research designs conducted in three different schools (n=129 students from 2nd and 6th grade), in order to assess the impact of intro...

  20. Polyamine stress at high pH in Escherichia coli K-12

    Directory of Open Access Journals (Sweden)

    Tate Daniel P

    2005-10-01

    Full Text Available Abstract Background Polyamines such as spermine and spermidine are required for growth of Escherichia coli; they interact with nucleic acids, and they bind to ribosomes. Polyamines block porins and decrease membrane permeability, activities that may protect cells in acid. At high concentrations, however, polyamines impair growth. They impair growth more severely at high pH, probably due to their increased uptake as membrane-permeant weak bases. The role of pH is critical in understanding polyamine stress. Results The effect of polyamines was tested on survival of Escherichia coli K-12 W3110 in extreme acid or base (pH conditions outside the growth range. At pH 2, 10 mM spermine increased survival by 2-fold, and putrescine increased survival by 30%. At pH 9.8, however, E. coli survival was decreased 100-fold by 10 mM spermine, putrescine, cadaverine, or spermidine. At pH 8.5, spermine decreased the growth rate substantially, whereas little effect was seen at pH 5.5. Spermidine required ten-fold higher concentrations to impair growth. On proteomic 2-D gels, spermine and spermidine caused differential expression of 31 different proteins. During log-phase growth at pH 7.0, 1 mM spermine induced eight proteins, including PykF, GlpK, SerS, DeaD, OmpC and OmpF. Proteins repressed included acetate-inducible enzymes (YfiD, Pta, Lpd as well as RapA (HepA, and FabB. At pH 8.5, spermine induced additional proteins: TnaA, OmpA, YrdA and NanA (YhcJ and also repressed 17 proteins. Four of the proteins that spermine induced (GlpK, OmpA, OmpF, TnaA and five that were repressed (Lpd, Pta, SucB, TpiA, YfiD show similar induction or repression, respectively, in base compared to acid. Most of these base stress proteins were also regulated by spermidine, but only at ten-fold higher concentration (10 mM at high pH (pH 8.5. Conclusion Polyamines increase survival in extreme acid, but decrease E. coli survival in extreme base. Growth inhibition by spermine and

  1. Phleomycin-induced lethality and DNA degradation in Escherichia coli K12

    Energy Technology Data Exchange (ETDEWEB)

    Nakayama, H

    1975-01-01

    The cell lethality and DNA fragmentation caused by phleomycin (PM) were studied in E. coli K12 strains with special reference to the effects of repair or recombination deficiencies and metabolic inhibitors. Unlike excision-defective derivatives of E. coli B, uvrA, uvrB, and uvrC mutants of strain K12 showed no peculiarities compared with wild type in regard to cell survival. Likewise, mutant alleles at uvrD and polA loci had no effect. In contrast, rec mutants were more sensitive to PM-killing than were rec/sup +/ strains. PM-induced strand breakage in DNA was observed in all strains tested including the above-mentioned mutants. There was no significant distinction between the uvr mutants and the wild type strain, indicating that the uvr-endonuclease was not responsible for the strand breaks. Involvement of endonuclease I was also ruled out. At least some of the PM-induced strand breaks were repairable. PM-induced lethality and strand breakage were totally dependent on energy supply. Inhibition of protein synthesis resulted in a partial and parallel suppression of the two effects. Our results suggest that the lethality is due to DNA strand breakage and the repair of such damage is postulated to be controlled by rec genes.

  2. The Development of a Conceptual Framework for New K-12 Science Education Standards (Invited)

    Science.gov (United States)

    Keller, T.

    2010-12-01

    The National Academy of Sciences has created a committee of 18 National Academy of Science and Engineering members, academic scientists, cognitive and learning scientists, and educators, educational policymakers and researchers to develop a framework to guide new K-12 science education standards. The committee began its work in January, 2010, released a draft of the framework in July, 2010, and intends to have the final framework in the first quarter of 2011. The committee was helped in early phases of the work by consultant design teams. The framework is designed to help realize a vision for science and engineering education in which all students actively engage in science and engineering practices in order to deepen their understanding of core ideas in science over multiple years of school. These three dimensions - core disciplinary ideas, science and engineering practices, and cross-cutting elements - must blend together to build an exciting, relevant, and forward looking science education. The framework will be used as a base for development of next generation K-12 science education standards.

  3. Associations of Escherichia coli K-12 OmpF trimers with rough and smooth lipopolysaccharides

    International Nuclear Information System (INIS)

    Diedrich, D.L.; Stein, M.A.; Schnaitman, C.A.

    1990-01-01

    The associations of both rough and smooth lipopolysaccharides (LPS) with the OmpF porin of Escherichia coli K-12 were examined in galE strains deleted for ompC. Transformation with pSS37 and growth with galactose conferred the ability to assemble a Shigella dysenteriae O antigen onto the core oligosaccharide of E. coli K-12 LPS. The association of LPS with OmpF trimers was assessed by staining, autoradiography of LPS specifically labeled with [1-14C]galactose, and Western immunoblotting with a monoclonal antibody specific for OmpF trimers. These techniques revealed that the migration distances and multiple banding patterns of OmpF porin trimers in sodium dodecyl sulfate-polyacrylamide gels were dictated by the chemotype of associated LPS. Expression of smooth LPS caused almost all of the trimeric OmpF to run in gels with a slower mobility than trimers from rough strains. The LPS associated with trimers from a smooth strain differed from the bulk-phase LPS by consisting almost exclusively of molecules with O antigen

  4. GenoBase: comprehensive resource database of Escherichia coli K-12.

    Science.gov (United States)

    Otsuka, Yuta; Muto, Ai; Takeuchi, Rikiya; Okada, Chihiro; Ishikawa, Motokazu; Nakamura, Koichiro; Yamamoto, Natsuko; Dose, Hitomi; Nakahigashi, Kenji; Tanishima, Shigeki; Suharnan, Sivasundaram; Nomura, Wataru; Nakayashiki, Toru; Aref, Walid G; Bochner, Barry R; Conway, Tyrrell; Gribskov, Michael; Kihara, Daisuke; Rudd, Kenneth E; Tohsato, Yukako; Wanner, Barry L; Mori, Hirotada

    2015-01-01

    Comprehensive experimental resources, such as ORFeome clone libraries and deletion mutant collections, are fundamental tools for elucidation of gene function. Data sets by omics analysis using these resources provide key information for functional analysis, modeling and simulation both in individual and systematic approaches. With the long-term goal of complete understanding of a cell, we have over the past decade created a variety of clone and mutant sets for functional genomics studies of Escherichia coli K-12. We have made these experimental resources freely available to the academic community worldwide. Accordingly, these resources have now been used in numerous investigations of a multitude of cell processes. Quality control is extremely important for evaluating results generated by these resources. Because the annotation has been changed since 2005, which we originally used for the construction, we have updated these genomic resources accordingly. Here, we describe GenoBase (http://ecoli.naist.jp/GB/), which contains key information about comprehensive experimental resources of E. coli K-12, their quality control and several omics data sets generated using these resources. © The Author(s) 2014. Published by Oxford University Press on behalf of Nucleic Acids Research.

  5. The role of Cra in regulating acetate excretion and osmotic tolerance in E. coli K-12 and E. coli B at high density growth.

    Science.gov (United States)

    Son, Young-Jin; Phue, Je-Nie; Trinh, Loc B; Lee, Sang Jun; Shiloach, Joseph

    2011-06-30

    E. coli B (BL21), unlike E.coli K-12 (JM109) is insensitive to glucose concentration and, therefore, grows faster and produces less acetate than E. coli K-12, especially when growing to high cell densities at high glucose concentration. By performing genomic analysis, it was demonstrated that the cause of this difference in sensitivity to the glucose concentration is the result of the differences in the central carbon metabolism activity. We hypothesized that the global transcription regulator Cra (FruR) is constitutively expressed in E. coli B and may be responsible for the different behaviour of the two strains. To investigate this possibility and better understand the function of Cra in the two strains, cra - negative E. coli B (BL21) and E. coli K-12 (JM109) were prepared and their growth behaviour and gene expression at high glucose were evaluated using microarray and real-time PCR. The deletion of the cra gene in E. coli B (BL21) minimally affected the growth and maximal acetate accumulation, while the deletion of the same gene in E.coli K-12 (JM109) caused the cells to stop growing as soon as acetate concentration reached 6.6 g/L and the media conductivity reached 21 mS/cm. ppsA (gluconeogenesis gene), aceBA (the glyoxylate shunt genes) and poxB (the acetate producing gene) were down-regulated in both strains, while acs (acetate uptake gene) was down-regulated only in E.coli B (BL21). These transcriptional differences had little effect on acetate and pyruvate production. Additionally, it was found that the lower growth of E. coli K-12 (JM109) strain was the result of transcription inhibition of the osmoprotectant producing bet operon (betABT). The transcriptional changes caused by the deletion of cra gene did not affect the activity of the central carbon metabolism, suggesting that Cra does not act alone; rather it interacts with other pleiotropic regulators to create a network of metabolic effects. An unexpected outcome of this work is the finding that cra

  6. K--12 science educator perception of instructing students with learning disabilities in the regular classroom

    Science.gov (United States)

    Holliday-Cashwell, Janet Rose

    2000-10-01

    Selected K--12 public school science educators in 14 eastern North Carolina counties were surveyed to examine their perceptions of their undergraduate preparation programs with regard to instructing students with learning disabilities in the regular classroom. A quantitative study, this research examined science educator preparedness in instructing students with learning disabilities by evaluating educator perception in regard to mainstrearned and inclusive educational settings. Specifically, two null hypotheses were tested. Null hypothesis I stated a significant difference does not exist between selected North Carolina K--12 science educators' perceptions of their undergraduate teacher education preparation programs and their perceptions of their abilities to instruct students needing accommodations on behalf of their learning disabilities in mainstrearned or inclusive settings. Participants' responses to perception as well as value statements regarding opinions, adaptations, and undergraduate training with respect to mainstreaming and inclusion were evaluated through t-test analyses of 22 Likert-scale items. Null hypothesis 1 was not accepted because a statistically significant difference did exist between the educators' perceptions of their undergraduate training and their perceived abilities to instruct students with learning disabilities in mainstreamed or inclusive settings. Null hypothesis 2 stated a significant difference does not exist between selected North Carolina K--12 science educators' attained educational level; grade level currently taught, supervised or chaired; and years of experience in teaching science, supervising science education, and/or chairing science departments in selected North Carolina public schools and their opinions of their undergraduate teacher education program with regard to instructing students with learning disabilities in mainstreamed or inclusive educational settings. Null hypothesis 2 was evaluated through an analysis of

  7. Climate Change Education Today in K-12: What's Happening in the Earth and Space Science Classroom?

    Science.gov (United States)

    Holzer, M. A.; National Earth Science Teachers Association

    2011-12-01

    Climate change is a highly interdisciplinary topic, involving not only multiple fields of science, but also social science and the humanities. There are many aspects of climate change science that make it particularly well-suited for exploration in the K-12 setting, including opportunities to explore the unifying processes of science such as complex systems, models, observations, change and evolution. Furthermore, this field of science offers the opportunity to observe the nature of science in action - including how scientists develop and improve their understanding through research and debate. Finally, climate change is inherently highly relevant to students - indeed, students today will need to deal with the consequences of the climate change. The science of climate change is clearly present in current science education standards, both at the National level as well as in the majority of states. Nonetheless, a significant number of teachers across the country report difficulties addressing climate change in the classroom. The National Earth Science Teachers Association has conducted several surveys of Earth and space science educators across the country over the past several years on a number of issues, including their needs and concerns, including their experience of external influences on what they teach. While the number of teachers that report external pressures to not teach climate change science are in the minority (and less than the pressure to not teach evolution and related topics), our results suggest that this pressure against climate change science in the K-12 classroom has grown over the past several years. Some teachers report being threatened by parents, being encouraged by administrators to not teach the subject, and a belief that the "two sides" of climate change should be taught. Survey results indicate that teachers in religious or politically-conservative districts are more likely to report difficulties in teaching about climate change than in

  8. Technical Support Document: Development of the Advanced Energy Design Guide for K-12 Schools--30% Energy Savings

    Energy Technology Data Exchange (ETDEWEB)

    Pless, S.; Torcellini, P.; Long, N.

    2007-09-01

    This Technical Support Document describes the process and methodology for the development of the Advanced Energy Design Guide for K-12 School Buildings (K-12 AEDG), a design guidance document intended to provide recommendations for achieving 30% energy savings in K-12 Schools over levels contained in ANSI/ASHRAE/IESNA Standard 90.1-1999, Energy Standard for Buildings Except Low-Rise Residential Buildings. The 30% energy savings target is the first step toward achieving net-zero energy schools; schools that, on an annual basis, draw from outside sources less or equal energy than they generate on site from renewable energy sources.

  9. DNA synthesis and uv resistance in Escherichia coli K12 cells

    Energy Technology Data Exchange (ETDEWEB)

    Slezarikova, V [Slovenska Akademia Vied, Bratislava (Czechoslovakia). Vyskumny Ustav Onkologicky

    1976-01-01

    The influence was studied of preirradiation inhibition of proteosynthesis by amino acids starvation on survival and DNA synthesis in E. coli K 12 cells, which differ by their genetic features with regard to a certain type of repair. The surviving fraction was studied by appropriate dilution of cell suspension and spreading on agar plates. DNA synthesis was investigated by the incorporation of thymine-2-/sup 14/C. In our conditions a correlation was found between cell survival and the resistance of DNA replication to UV radiation in cells proficient in excision and post-replication repair. This correlation was not found in the excision deficient strain. It is concluded that enhanced resistance of DNA replication is not a sufficient condition for enhanced cell resistance.

  10. The EcoCyc database: reflecting new knowledge about Escherichia coli K-12.

    Science.gov (United States)

    Keseler, Ingrid M; Mackie, Amanda; Santos-Zavaleta, Alberto; Billington, Richard; Bonavides-Martínez, César; Caspi, Ron; Fulcher, Carol; Gama-Castro, Socorro; Kothari, Anamika; Krummenacker, Markus; Latendresse, Mario; Muñiz-Rascado, Luis; Ong, Quang; Paley, Suzanne; Peralta-Gil, Martin; Subhraveti, Pallavi; Velázquez-Ramírez, David A; Weaver, Daniel; Collado-Vides, Julio; Paulsen, Ian; Karp, Peter D

    2017-01-04

    EcoCyc (EcoCyc.org) is a freely accessible, comprehensive database that collects and summarizes experimental data for Escherichia coli K-12, the best-studied bacterial model organism. New experimental discoveries about gene products, their function and regulation, new metabolic pathways, enzymes and cofactors are regularly added to EcoCyc. New SmartTable tools allow users to browse collections of related EcoCyc content. SmartTables can also serve as repositories for user- or curator-generated lists. EcoCyc now supports running and modifying E. coli metabolic models directly on the EcoCyc website. © The Author(s) 2016. Published by Oxford University Press on behalf of Nucleic Acids Research.

  11. Tif-stimulated deoxyribonucleic acid repair in Escherichia coli K-12

    International Nuclear Information System (INIS)

    Castellazzi, M.; Jacques, M.; George, J.

    1980-01-01

    Bacterial survival is significantly increased after ultraviolet irradiation in tif sfi cells, provided that the thermosensitive tif mutation has been expressed at 41 0 C before irradiation. This tif-mediated reactivation of ultraviolet irradiated bacteria needs de novo protein synthesis, as is the case for the tif-mediated reactivation of ultraviolet-irradiated phage lambda. However, in striking contrast to the phage reactivation process, this tif-mediated reactivation is no longer associated with mutagenesis. It also requires the presence of the uvrA + excision function. These results strongly suggest the existence in Escherichia coli K-12 of a repair pathway acting on bacterial deoxyribonucleic acid which is inducible, error free, and uvr dependent

  12. Achieving 50% Energy Savings in New Schools, Advanced Energy Design Guides: K-12 Schools (Brochure)

    Energy Technology Data Exchange (ETDEWEB)

    2014-09-01

    This fact sheet summarizes recommendations for designing elementary, middle, and high school buildings that will result in 50% less energy use than conventional new schools built to minimum code requirements. The recommendations are drawn from the Advanced Energy Design Guide for K-12 School Buildings, an ASHRAE publication that provides comprehensive recommendations for designing low-energy-use school buildings (see sidebar). Designed as a stand-alone document, this fact sheet provides key principles and a set of prescriptive design recommendations appropriate for smaller schools with insufficient budgets to fully implement best practices for integrated design and optimized performance. The recommendations have undergone a thorough analysis and review process through ASHRAE, and have been deemed the best combination of measures to achieve 50% savings in the greatest number of schools.

  13. Mutants of Escherichia coli K-12 with enhanced resistance to ionizing radiation

    International Nuclear Information System (INIS)

    Verbenko, V.N.; Akhmedov, A.T.; Kalinin, V.L.

    1986-01-01

    By means of one-dimensional electrophoresis, it is shown that in radiation-resistant Gam 444 ad Gam 445 mutants of Escherichia coli K-12 high-molecular weight heat shock proteins are hyperproduced at 32-37 deg C and are induced more intensively during heat shock (in comparison to the parental) wild-tupe strain AB parallel 57). When the missense htp R15 mutation of the positive regulatory htpR gene for heat shock proteins was introduced by transduction into genome of the Gam 444 mutant, its enhanced radiation-resistance disappeared but could not be restored upon introduction of pKV3 plasmid bearing the htpR, gene. These data show that heat shock Protens are participating in the enhanced radioresistance of Gam mutants

  14. USE OF SECOND LIFE IN K-12 AND HIGHER EDUCATION: A Review of Research

    Directory of Open Access Journals (Sweden)

    Chris INMAN

    2011-08-01

    Full Text Available This study reviewed empirical research conducted in Second Life by educators since Second Life’s launch in 2003. The study’s purpose was to identify how Second Life is being used in both K-12 and higher education. The methodology, findings, and recommendations of 27 research studies were analyzed. Researchers identified potential problems when using Second Life in education, including issues with the Second Life software and hardware requirements, a steep learning curve, and the possibility of students becoming exposed to distractions or inappropriate content. Researchers discussed potential uses of Second Life including role-play, game and simulation creation, implementation within distance education programs, and the ability to encourage student-centered learning activities. Analysis also revealed several recommendations for educators intending to use Second Life.

  15. Code to Learn: Where Does It Belong in the K-12 Curriculum?

    Directory of Open Access Journals (Sweden)

    Jesús Moreno León

    2016-06-01

    Full Text Available The introduction of computer programming in K-12 has become mainstream in the last years, as countries around the world are making coding part of their curriculum. Nevertheless, there is a lack of empirical studies that investigate how learning to program at an early age affects other school subjects. In this regard, this paper compares three quasi-experimental research designs conducted in three different schools (n=129 students from 2nd and 6th grade, in order to assess the impact of introducing programming with Scratch at different stages and in several subjects. While both 6th grade experimental groups working with coding activities showed a statistically significant improvement in terms of academic performance, this was not the case in the 2nd grade classroom. Notable disparity was also found regarding the subject in which the programming activities were included, as in social studies the effect size was double that in mathematics.

  16. Molecular structure of the pyruvate dehydrogenase complex from Escherichia coli K-12.

    Science.gov (United States)

    Vogel, O; Hoehn, B; Henning, U

    1972-06-01

    The pyruvate dehydrogenase core complex from E. coli K-12, defined as the multienzyme complex that can be obtained with a unique polypeptide chain composition, has a molecular weight of 3.75 x 10(6). All results obtained agree with the following numerology. The core complex consists of 48 polypeptide chains. There are 16 chains (molecular weight = 100,000) of the pyruvate dehydrogenase component, 16 chains (molecular weight = 80,000) of the dihydrolipoamide dehydrogenase component, and 16 chains (molecular weight = 56,000) of the dihydrolipoamide dehydrogenase component. Usually, but not always, pyruvate dehydrogenase complex is produced in vivo containing at least 2-3 mol more of dimers of the pyruvate dehydrogenase component than the stoichiometric ratio with respect to the core complex. This "excess" component is bound differently than are the eight dimers in the core complex.

  17. Crowd-Sourcing with K-12 citizen scientists: The Continuing Evolution of the GLOBE Program

    Science.gov (United States)

    Murphy, T.; Wegner, K.; Andersen, T. J.

    2016-12-01

    Twenty years ago, the Internet was still in its infancy, citizen science was a relatively unknown term, and the idea of a global citizen science database was unheard of. Then the Global Learning and Observations to Benefit the Environment (GLOBE) Program was proposed and this all changed. GLOBE was one of the first K-12 citizen science programs on a global scale. An initial large scale ramp-up of the program was followed by the establishment of a network of partners in countries and within the U.S. Now in the 21st century, the program has over 50 protocols in atmosphere, biosphere, hydrosphere and pedosphere, almost 140 million measurements in the database, a visualization system, collaborations with NASA satellite mission scientists (GPM, SMAP) and other scientists, as well as research projects by GLOBE students. As technology changed over the past two decades, it was integrated into the program's outreach efforts to existing and new members with the result that the program now has a strong social media presence. In 2016, a new app was launched which opened up GLOBE and data entry to citizen scientists of all ages. The app is aimed at fresh audiences, beyond the traditional GLOBE K-12 community. Groups targeted included: scouting organizations, museums, 4H, science learning centers, retirement communities, etc. to broaden participation in the program and increase the number of data available to students and scientists. Through the 20 years of GLOBE, lessons have been learned about changing the management of this type of large-scale program, the use of technology to enhance and improve the experience for members, and increasing community involvement in the program.

  18. Marshalling Corporate Resources for Public and K-12 Technical Education Outreach and Engagement

    Science.gov (United States)

    Wynne, James

    2011-03-01

    In 1988, the Education Task Force of the Business Roundtable recommended that American corporations invest in pre-college education. Prior to that date, corporate investment was targeted at higher education. IBM and other corporations responded by encouraging their employees and their corporate philanthropic organizations to develop programs aimed at enhancing pre-college education. The IBM TJ Watson Research Center initiated a Local Education Outreach program, active for these past 23 years, that marshals the resources of our science-rich institution to enhance STEM education in our local schools. We have broad and deep partnerships between the Research Center and local school districts, including New York City. We have just completed our 19th consecutive year of Family Science Saturdays, which brings 4th and 5th grade children, along with their parents, to our Research Center for hands-on workshops in topics like States of Matter, Polymer Science, Kitchen Chemistry, and Sound and Light. The workshops are staffed by IBM volunteers, assisted by local high school student ``Peer Teachers.'' Since 1990, the IBM Corporation has joined with a coalition of other companies, professional engineering societies, and government agencies to sponsor the annual Engineers Week (EWeek) campaign of technical education outreach, serving as Corporate Chair in 1992, 2001, and 2008. In recent years, we have annually recruited around 5000 IBM volunteers to reach out to more than 200,000 K-12 students in order to increase their awareness and appreciation of technical careers and encourage them to continue their studies of STEM (science, technology, engineering, and mathematics). The speaker, who helped found the APS Forum on Education (FED) and served as FED Councillor for 8 years, will review these and other programs for Public and K-12 Technical Education Outreach and Engagement.

  19. Educational Technology: A Review of the Integration, Resources, and Effectiveness of Technology in K-12 Classrooms

    Directory of Open Access Journals (Sweden)

    Adolph Delgado

    2015-09-01

    Full Text Available There is no questioning that the way people live, interact, communicate, and conduct business is undergoing a profound, rapid change. This change is often referred to as the “digital revolution,” which is the advancement of technology from analog, electronic and mechanical tools to the digital tools available today. Moreover, technology has begun to change education, affecting how students acquire the skill sets needed to prepare for college and a career and how educators integrate digital technological instructional strategies to teach. Numerous studies have been published discussing the barriers of integrating technology, the estimated amount of investment that is needed in order to fully support educational technology, and, of course, the effectiveness of technology in the classroom. As such, this article presents a critical review of the transitions that technology integration has made over the years; the amount of resources and funding that has been allocated to immerse school with technology; and the conflicting results presented on effectiveness of using is technology in education. Through synthesis of selected themes, we found a plethora of technological instructional strategies being used to integrate technology into K-12 classrooms. Also, though there have been large investments made to integrate technology into K-12 classrooms to equip students with the skills needed to prepare for college and a career, the practical use of this investment has not been impressive. Lastly, several meta-analyses showed promising results of effectiveness of technology in the classroom. However, several inherent methodological and study design issues dampen the amount of variance that technology accounts for.

  20. Genetic Transfer of Salmonella typhimurium and Escherichia coli Lipopolysaccharide Antigens to Escherichia coli K-12

    Science.gov (United States)

    Jones, Randall T.; Koeltzow, Donald E.; Stocker, B. A. D.

    1972-01-01

    Escherichia coli K-12 ϰ971 was crossed with a smooth Salmonella typhimurium donor, HfrK6, which transfers early the ilv-linked rfa region determining lipopolysaccharide (LPS) core structure. Two ilv+ hybrids differing in their response to the LPS-specific phages FO and C21 were then crossed with S. typhimurium HfrK9, which transfers early the rfb gene cluster determining O repeat unit structure. Most recombinants selected for his+ (near rfb) were agglutinated by Salmonella factor 4 antiserum. Transfer of an F′ factor (FS400) carrying the rfb–his region of S. typhimurium to the same two ilv+ hybrids gave similar results. LPS extracted from two ilv+,his+, factor 4-positive hybrids contained abequose, the immunodominant sugar for factor 4 specificity. By contrast, his+ hybrids obtained from ϰ971 itself by similar HfrK9 and F′FS400 crosses were not agglutinated by factor 4 antiserum, indicating that the parental E. coli ϰ971 does not have the capacity to attach Salmonella O repeat units to its LPS core. It is concluded that the Salmonella rfb genes are expressed only in E. coli ϰ971 hybrids which have also acquired ilv-linked genes (presumably rfa genes affecting core structure or O-translocase ability, or both) from a S. typhimurium donor. When E. coli ϰ971 was crossed with a smooth E. coli donor, Hfr59, of serotype O8, which transfers his early, most his+ recombinants were agglutinated by E. coli O8 antiserum and lysed by the O8-specific phage, Ω8. This suggests that, although the parental E. coli K-12 strain ϰ971 cannot attach Salmonella-specific repeat units to its LPS core, it does have the capacity to attach E. coli O8-specific repeat units. PMID:4559827

  1. Ultraviolet radiation-induced mutability of uvrD3 strains of Escherichia coli B/r and K-12: a problem in analyzing mutagenesis data

    International Nuclear Information System (INIS)

    Smith, K.C.

    1976-01-01

    The involvement of the uvrD gene product in UV-induced mutagenesis in Escherichia coli was studied by comparing wild-type and uvrA or uvrB strains with their uvrD derivatives in B/r and K-12(W3110) backgrounds. Mutations per survivor (reversions to prototrophy) were compared as a function of surviving fraction and of UV fluence. While recognizing that both methods are not without problems, arguments are presented for favoring the former rather than the latter method of presenting the data when survival is less than 100%. When UV-induced mutation frequencies were plotted as a function of surviving fraction, the uvrD derivatives were less mutable than the corresponding parent strains. The B/r strains exhibited higher mutation frequencies than did the K-12(W3110) strains. A uvrB mutation increased the mutation frequency of its parental K-12 strain, but a uvrA mutation only increased the mutation frequency of its parental B/r strain at UV survivals greater than approximately 80%. Both the uvrA and uvrB mutations increased the mutation frequencies of the uvrD strains in the B/r and K-12 backgrounds, respectively. Rather different conclusions would be drawn if mutagenesis were considered as a function of UV fluence rather than of survival, a situation that calls for further work and discussion. Ideally mutation efficiencies should be compared as a function of the number of repair events per survivor, a number that is currently unobtainable. (author)

  2. A Library approach to establish an Educational Data Curation Framework (EDCF) that supports K-12 data science sustainability

    Science.gov (United States)

    Branch, B. D.; Wegner, K.; Smith, S.; Schulze, D. G.; Merwade, V.; Jung, J.; Bessenbacher, A.

    2013-12-01

    It has been the tradition of the libraries to support literacy. Now in the realm of Executive Order, Making Open and Machine Readable the New Default for Government Information, May 9, 2013, the library has the responsibility to support geospatial data, big data, earth science data or cyber infrastructure data that may support STEM for educational pipeline stimulation. (Such information can be found at http://www.whitehouse.gov/the-press-office/2013/05/09/executive-order-making-open-and-machine-readable-new-default-government-.) Provided is an Educational Data Curation Framework (EDCF) that has been initiated in Purdue research, geospatial data service engagement and outreach endeavors for future consideration and application to augment such data science and climate literacy needs of future global citizens. In addition, this endorsement of this framework by the GLOBE program may facilitate further EDCF implementations, discussion points and prototypes for libraries. In addition, the ECDF will support teacher-led, placed-based and large scale climate or earth science learning systems where such knowledge transfer of climate or earth science data is effectively transferred from higher education research of cyberinfrastructure use such as, NOAA or NASA, to K-12 teachers and school systems. The purpose of this effort is to establish best practices for sustainable K-12 data science delivery system or GLOBE-provided system (http://vis.globe.gov/GLOBE/) where libraries manage the data curation and data appropriateness as data reference experts for such digital data. Here, the Purdue University Libraries' GIS department works to support soils, LIDAR and water science data experiences to support teacher training for an EDCF development effort. Lastly, it should be noted that the interdisciplinary collaboration and demonstration of library supported outreach partners and national organizations such the GLOBE program may best foster EDCF development. This trend in data

  3. K-12 Schools: The Effect of Public School Choices on Marine Families’ Co-Location Decisions

    Science.gov (United States)

    2017-03-01

    3. REPORT TYPE AND DATES COVERED Master’s thesis 4. TITLE AND SUBTITLE K-12 SCHOOLS: THE EFFECT OF PUBLIC SCHOOL CHOICES ON MARINE FAMILIES’ CO...be educated ? One theory regarding decision-making in general is the rational choice theory . This approach to explaining the process of making...NAVAL POSTGRADUATE SCHOOL MONTEREY, CALIFORNIA THESIS Approved for public release. Distribution is unlimited. K-12 SCHOOLS

  4. Creation of a Research Community in a K-12 School System Using Action Research and Evidence Based Practice

    Directory of Open Access Journals (Sweden)

    Jean K. Sand

    2009-06-01

    that understanding how to properly cite sources was a major area of concern. Students were also confused about whom to ask for help during the research process. Instructional intervention was developed and applied. The survey was re-administered with the addition of items that were based on the interventions. Responses showed a marked improvement in understanding by at least 20%. Some responses improved by as much as 60%. Conclusion - The study validated the Action Research Training Model as the first dimension and conceptual framework that informs and guides instructional practices of school library media specialists and teachers in a K-12 school district. After using the model to examine student-teacher knowledge and understanding of ethical use of information (second dimension, there was recognition of the need to clarify the school’s position on the ethical use of information for teachers and students and provide intentional instruction and interventions for students beginning at an earlier grade level. After being made aware of the results, teachers were anxious to work with library media specialists to address issues and to look for opportunities within research units to collaborate.

  5. Biological features produced by additive manufacturing processes using vat photopolymerization method

    DEFF Research Database (Denmark)

    Davoudinejad, Ali; Mendez Ribo, Macarena; Pedersen, David Bue

    2017-01-01

    of micro biological features by Additive Manufacturing (AM) processes. The study characterizes the additive manufacturing processes for polymeric micro part productions using the vat photopolymerization method. A specifically designed vat photopolymerization AM machine suitable for precision printing...

  6. An Investigative Study on the Effect of Silver Nanoparticles on E.Coli K12 in Various Sodium Chloride Concentrations

    Science.gov (United States)

    Levard, C.; Mitra, S.; Badireddy, A.; Jew, A. D.; Brown, G. E.

    2011-12-01

    Engineered nanomaterials have had an increasing presence in consumer products. Consequently, their release in wastewater systems is believed to pose a viable threat to the environment. NPs are used for drug delivery devices, imaging agents, and consumer products like sunscreens, paints, and cosmetics. Among the major types of manufactured nanoparticles, silver nanoparticles (Ag-NPs) are currently the most widely used in the nanotechnology industry. These particles have unique antibacterial, antiviral, and antifungal properties and as a result, there is a growing concern about the environmental impact of released Ag nanoparticles, particularly their unintended impact on organisms and ecosystems. Even though the toxicity of Ag-NPs has been extensively studied, the environmental transformations that the Ag-NPs may experience once released in the environment have not been considered. These transformations can readily impact their properties and therefore their behavior in terms of reactivity and toxicity. For example, it is known that silver strongly react with Chloride (Cl), which is ubiquitous in natural waters. At a low Cl/Ag ratio, Cl may precipitate on the surface and partly inhibit dissolution. On the contrary, for a high Cl/Ag ratio, chloride may enhance dissolution and therefore toxicity since soluble Ag species are a main source of toxicity. In this context, the focus of this study is on understanding the toxicity of coated Ag-NPs at various concentrations (1ppb-100ppm) on E.Coli (K12) in deionized water and various sodium chloride concentrations that mimic natural conditions (.5, .1 and .01 M NaCl). Ag+ ions (100 ppm-1ppb) were also tested in these salt concentrations as a control. Samples were inoculated in bacteria and incubated for 24 hours. Based on this test, we inferred that increasing concentrations of Ag+ ions/ AgNps played a role in the inhibition of growth of E.Coli K12. A live-dead staining test has shown the correlation between inhibition of

  7. Creating User-Friendly Tools for Data Analysis and Visualization in K-12 Classrooms: A Fortran Dinosaur Meets Generation Y

    Science.gov (United States)

    Chambers, L. H.; Chaudhury, S.; Page, M. T.; Lankey, A. J.; Doughty, J.; Kern, Steven; Rogerson, Tina M.

    2008-01-01

    During the summer of 2007, as part of the second year of a NASA-funded project in partnership with Christopher Newport University called SPHERE (Students as Professionals Helping Educators Research the Earth), a group of undergraduate students spent 8 weeks in a research internship at or near NASA Langley Research Center. Three students from this group formed the Clouds group along with a NASA mentor (Chambers), and the brief addition of a local high school student fulfilling a mentorship requirement. The Clouds group was given the task of exploring and analyzing ground-based cloud observations obtained by K-12 students as part of the Students' Cloud Observations On-Line (S'COOL) Project, and the corresponding satellite data. This project began in 1997. The primary analysis tools developed for it were in FORTRAN, a computer language none of the students were familiar with. While they persevered through computer challenges and picky syntax, it eventually became obvious that this was not the most fruitful approach for a project aimed at motivating K-12 students to do their own data analysis. Thus, about halfway through the summer the group shifted its focus to more modern data analysis and visualization tools, namely spreadsheets and Google(tm) Earth. The result of their efforts, so far, is two different Excel spreadsheets and a Google(tm) Earth file. The spreadsheets are set up to allow participating classrooms to paste in a particular dataset of interest, using the standard S'COOL format, and easily perform a variety of analyses and comparisons of the ground cloud observation reports and their correspondence with the satellite data. This includes summarizing cloud occurrence and cloud cover statistics, and comparing cloud cover measurements from the two points of view. A visual classification tool is also provided to compare the cloud levels reported from the two viewpoints. This provides a statistical counterpart to the existing S'COOL data visualization tool

  8. Plasmid (pKM101)-mediated enhancement of repair and mutagenesis: dependence on chromosomal genes in 'Escherichia coli' K-12

    International Nuclear Information System (INIS)

    Walker, G.C.

    1977-01-01

    The drug resistance plasmid pKM101 plays a major role in the Ames Salmonella/microsome carcinogen detecting system by enhancing chemical mutagenesis. It is shown that in Escherichia coli K-12 the plasmid pKM101 enhances both spontaneous and methyl methanesulfonate-caused reversion of an ochre mutation, bacterial survival after ultaviolet irradiation, and reactivation of ultraviolet-irradiated lambda in unirradiated cells. All these effects are shown to be dependent on the recA + lexA + genotype but not on the recB + recC + or recF + genotypes. The recA lexA-dependence of the plasmid-mediated repair and mutagenesis suggests an interaction with the cell's inducible error-prone repair system. The presence of pKM101 is shown to cause an additional increase in methyl methanesulfonate mutagenesis in a tif mutant beyond that caused by growth at 42 0 . The presence of the plasmid raises the level of the Weigle-reactivation curve for the reactivation of ultraviolet-irradiated lambda in E. coli and causes a shift of the maximum to a higher UV fluence. These observations suggest that pKM101 does not exert its effects by altering the regulation of the cell's error-prone repair system but rather by supplying a mechanistic component or components. (orig.) [de

  9. Cataclysms and Catastrophes: A Case Study of Improving K-12 Science Education Through a University Partnership

    Science.gov (United States)

    Fennell, T.; Ellins, K. K.; Morris, M.; Christeson, G.

    2003-12-01

    The K-12 science teacher is always seeking ways of improving and updating their curriculum by integrating the latest research into their most effective classroom activities. However, the daily demands of delivering instruction to large numbers of students coupled with the rapid advances in some fields of science can often overwhelm this effort. The NSF-sponsored Cataclysms and Catastrophes curriculum, developed by scientists from the The University of Texas at Austin Institute for Geophysics (UTIG) and Bureau of Economic Geology (BEG), middle and high school teachers, and UT graduate students (NSF GK-12 fellows) working together through the GK-12 program, is a textbook example of how universities can facilitate this quest, benefiting education at both K-12 and university levels. In 1992, "The Great K-T Extinction Debate" was developed as an activity in the Planet Earth class at the Liberal Arts and Science Academy of Austin as an interdisciplinary approach to science. Taking advantage of the media attention generated by the impact scenario for the K-T extinction, the activity consists of students participating in a simulated senate hearing on the potential causes of the K-T extinction and their implications for society today. This activity not only exposes students to the wide range of science involved in understanding mass extinctions, but also to the social, political and economic implications when this science is brought into the public arena and the corresponding use of data in decision making and disaster preparedness. While "The Great K-T Extinction Debate" was always a popular and effective activity with students, it was in desperate need of updating to keep pace with the evolving scientific debate over the cause of the K-T extinction and the growing body of impact evidence discovered over the past decade. By adding two inquiry-based learning activities that use real geophysical data collected by scientists studying the buried Chicxulub feature as a

  10. Science Communication versus Science Education: The Graduate Student Scientist as a K-12 Classroom Resource

    Science.gov (United States)

    Strauss, Jeff; Shope, Richard E., III; Terebey, Susan

    2005-01-01

    Science literacy is a major goal of science educational reform (NRC, 1996; AAAS, 1998; NCLB Act, 2001). Some believe that teaching science only requires pedagogical content knowledge (PCK). Others believe doing science requires knowledge of the methodologies of scientific inquiry (NRC, 1996). With these two mindsets, the challenge for science educators is to create models that bring the two together. The common ground between those who teach science and those who do science is science communication, an interactive process that galvanizes dialogue among scientists, teachers, and learners in a rich ambience of mutual respect and a common, inclusive language of discourse . The dialogue between science and non-science is reflected in the polarization that separates those who do science and those who teach science, especially as it plays out everyday in the science classroom. You may be thinking, why is this important? It is vital because, although not all science learners become scientists, all K-12 students are expected to acquire science literacy, especially with the implementation of the No Child Left Behind Act of 2001 (NCLB). Students are expected to acquire the ability to follow the discourse of science as well as connect the world of science to the context of their everyday life if they plan on moving to the next grade level, and in some states, to graduate from high school. This paper posits that science communication is highly effective in providing the missing link for K-12 students cognition in science and their attainment of science literacy. This paper will focus on the "Science For Our Schools" (SFOS) model implemented at California State Univetsity, Los Angeles (CSULA) as a project of the National Science Foundation s GK-12 program, (NSF 2001) which has been a huge success in bridging the gap between those who "know" science and those who "teach" science. The SFOS model makes clear the distinctions that identify science, science communication, science

  11. YbiV from E. coli K12 is a HAD phosphatase

    Energy Technology Data Exchange (ETDEWEB)

    Roberts, Anne; Lee, Seok-Yong; McCullagh, Emma; Silversmith, Ruth E.; Wemmer, David E.

    2004-03-16

    The protein YbiV from Escherichia coli K12 MG1655 is a hypothetical protein with sequence homology to the haloacid dehalogenase (HAD) superfamily of proteins. Although numerous members of this family have been identified, the functions of few are known. Using the crystal structure, sequence analysis, and biochemical assays, we have characterized ybiV as a HAD phosphatase. The crystal structure of YbiV reveals a two domain protein, one with the characteristic HAD hydrolase fold, the other an inserted a/b fold. In an effort to understand the mechanism we also solved and report the structures of YbiV in complex with beryllofluoride (BeF3-) and aluminum trifluoride (AlF3) which have been shown to mimic the phosphorylated intermediate and transition state for hydrolysis, respectively, in analogy to other HAD phosphatases. Analysis of the structures reveals the substrate binding cavity, which is hydrophilic in nature. Both structure and sequence homology indicate ybiV may be a sugar phosphatase, which is supported by biochemical assays which measured the release of free phosphate on a number of sugar-like substrates. We also investigated available genomic and functional data in an effort to determine the physiological substrate.

  12. Competitive accumulation of betaines by Escherichia coli K-12 and derivative strains lacking betaine porters.

    Science.gov (United States)

    Randall, K; Lever, M; Peddie, B A; Chambers, S T

    1995-08-17

    Escherichia coli was grown in hyperosmotic media containing both glycine betaine and one other betaine. E. coli K-12 derivative WG439 (putP- proP- proU-) did not accumulate any of 15 betaines. Strains WG445 (putP- proP- proU+), WG443 (putP- proP+ proU-) and the control strains all accumulated less betaine, (CH3)3N(+)-(CH2)n-COO-, when n was greater than 1. Accumulation was not detectable when n = 5. Both L- and D-isomers of alpha-substituted betaines were accumulated by both strains WG443 and WG445, the D-isomers more slowly. Hydroxylated alpha-substituted betaines were accumulated relatively more through the osmoregulated transport protein ProU than through ProP. In actively growing cultures glycine betaine appeared to be the preferred substrate for accumulation, but the proportion of the second accumulated betaine increased as cultures approached stationary phase.

  13. Characterization of new radiation-sensitive mutant, Escherichia coli K-12 radC102

    International Nuclear Information System (INIS)

    Felzenszwalb, I.; Sargentini, N.J.; Smith, K.C.

    1984-01-01

    A new radiation-sensitive mutant, radC, has been isolated. The radC gene is located at 81.0 min on the Escherichia coli K-12 linkage map. The radC mutation sensitized cells to uv radiation, but unlike most DNA repair mutations, sensitization to X rays was observed only for rich medium-grown cells. For cells grown in rich medium, the radC mutant was normal for γ radiation mutagenesis, but showed less uv-radiation mutagenesis than the wild-type strain; it showed normal amount of X- and uv-radiation-induced DNA degradation, and it wasapprox. =60% deficient in recombination ability. The radC strain was normal for host cell reactivation of γ and uv-irradiated bacteriophage the radC mutation did not sensitize a recA strain, but did sensitize a radA and a polA strain to X and uv radiation and a uvrA strain to uv radiation. Therefore, it is suggested that the radC gene product plays a role in the growth medium-dependent, recA gene-dependent repair of DNA single-strand breaks after X irradiation, and in postreplication repair after uv irradiation

  14. Fat dogs and coughing horses: K-12 programming for veterinary workforce development.

    Science.gov (United States)

    San Miguel, Sandra F; Carleton Parker, Loran; Adedokun, Omolola A; Burgess, Wilella D; Cipriani Davis, Kauline S; Blossom, Thaddaeus D; Schneider, Jessica L; Mennonno, Ann M; Ruhl, Joseph D; Veatch, Jennifer H; Wackerly, Amy J; Shin, Soo Yeon; Ratliff, Timothy L

    2013-01-01

    Workforce development strategies to educate, inform, and diversify the veterinary profession of the future must begin with children in elementary school. This article provides a description of the Fat Dogs and Coughing Horses program, which takes a multifaceted approach toward informing young students, beginning in first grade, about the interesting work and career opportunities available in the field of veterinary medicine. The program, a collaboration among Purdue University and Indiana public schools, is supported by a Science Education Partnership Award from the Office of Research Infrastructure Programs, a component of the National Institutes of Health. The overall goal of the program is to provide formal and informal educational opportunities for students, parents, teachers, and the public about the science involved in keeping people and their animals healthy. Examples of health concerns that impact both people and their pets are used to inform and excite children about careers in the health sciences. The program resulted in (1) curricula for students in Grades 1-3, 6, and 9; (2) four children's books and a set of collectible cards which highlight veterinarians, veterinary technicians, and research scientists who work with animals; and (3) four traveling museum-level quality exhibits. Preliminary assessment data has shown that the implementation of the curricula enhanced student science learning and science attitudes and interests. The program provides evidence that partnerships among professionals in veterinary medicine and K-12 education can result in impactful workforce development programs.

  15. NASA Education Activity Training (NEAT): Professional Development for Montana K-12 Teachers

    Science.gov (United States)

    Williamson, Kathryn; McKenzie, D.; Des Jardins, A.; Key, J.; Kanode, C.; Willoughby, S.

    2012-05-01

    Piloted during the 2011-2012 academic year, the NASA Education Activity Training (NEAT) teacher workshop program has introduced five solar astronomy and space weather activities to over forty Montana K-12 teachers. Because many Montana schools are geographically isolated (40% of Montana students live more than 50 miles from a city) and/or serve traditionally underrepresented groups (primarily Native Americans), professional development for teachers can be costly and time consuming. However, with funding shared by the Atmospheric Imaging Assembly EPO team and the Montana Space Grant Consortium, graduate student specialists are able to host the two-hour NEAT workshops on-site at the schools free of charge, and participating teachers earn two continuing education credits. Leveraging the existing catalogue of research-based NASA activities, the featured NEAT activities were chosen for their ease-of-use and applicability to Montana science standards. These include three advanced activities for older students, such as a paper plate activity for the June 5th, 2012 Transit of Venus, Kinesthetic Astronomy, and the Herschel Infrared experiment, along with two simpler activities for the younger students, such as Solar Cookies and the Electromagnetic War card game. Feedback surveys show that NEAT workshop participants were interested and engaged in the activities and planned on using the activities in their classrooms. With such positive responses, the NEAT program has been a huge success and can serve as a model for other institutions looking to increase their space public outreach and education.

  16. The mechanism of uncoupling by picrate in Escherichia coli K-12 membrane systems.

    Science.gov (United States)

    Michels, M; Bakker, E P

    1981-06-01

    The mechanism of action of the uncoupler picrate on intact cells and everted membrane vesicles of Escherichia coli K-12 was investigated. Like in mitochondria [Hanstein, W. G. and Hatefi, Y. (1974) Proc. Natl Acad. Sci. USA, 71, 288-292], it was observed that picrate uncoupled energy-linked functions only in everted, but not in intact membrane systems. In the vesicles picrate also decreased the magnitude of the transmembrane proton-motive force at concentrations similar to those at which it caused uncoupling. Experiments with 14C-labelled picrate showed that this compound bound both to deenergized intact cells and everted vesicles. However, upon energization of the membrane, picrate was extruded from the intact cell and taken up to a larger extent by the vesicles. These energy-dependent changes in picrate uptake correlated with the magnitude of the transmembrane electrical potential, delta psi. It is therefore proposed that picrate is a permeant uncoupler, that delta psi is the driving force for picrate movement across biological membranes, and that the uncoupling activity of picrate in everted membrane systems is due to its protonophoric action.

  17. Are K-12 school environments harming students with obesity? A qualitative study of classroom teachers.

    Science.gov (United States)

    Kenney, Erica L; Redman, Morgan T; Criss, Shaniece; Sonneville, Kendrin R; Austin, S Bryn

    2017-03-01

    Weight bias can negatively impact health, and schools may be risky environments for students with obesity. We aimed to explore teachers' perceptions of the school experiences and academic challenges of students with obesity. We conducted interviews with 22 teachers in the Northeast, mid-Atlantic, and Midwest in July-August 2014. All interviews were transcribed verbatim, coded, and analyzed for important themes by two researchers using the immersion/crystallization approach. Most teachers felt that students with obesity were more likely to have academic difficulties. Two main perceptions of the reasons for these difficulties emerged: (1) obesity led to lower self-esteem that caused students to participate less, and (2) poorer nutrition, increased screen time, and reduced physical activity were simultaneously causing obesity and poorer academic performance. A few teachers described colleagues who felt students with obesity were not as motivated to work hard in school as their peers. Many teachers described school health promotion efforts focused on weight reduction that could exacerbate weight stigma and risk of disordered eating. Students with obesity, particularly girls, may be at risk for negative social and academic experiences in K-12 schools and may be perceived as struggling academically by their teachers.

  18. Using Off-the-Shelf Gaming Controllers For Computer Control in the K-12 Classroom

    Science.gov (United States)

    Bourgoin, N. L.; Withee, J.; Segee, M.; Birkel, S. D.; Albee, E.; Koons, P. O.; Zhu, Y.; Segee, B.

    2009-12-01

    In the classroom, the interaction between students, teachers, and datasets is becoming more game like. Software such as GoogleEarth allow students to interact with data on a more personal level; allowing them the dynamically change variables, move arbitrarily, and personalize their experience with the datasets. As this becomes more immersive, traditional software control such as keyboard and mouse begin to hold the student back in terms of intuitive interfacing with the data. This is a problem that has best been tackled by modern gaming systems such as the Wii, XBox 360, and Playstation 3 Systems. By utilizing the solutions given by these gaming systems, it is possible to further a students immersion with a system. Through an NSF ITEST (Information and Technology Experiences for Students and Teachers) grant, researchers at the University of Maine have experimented with using the game controller that is used for interacting with the Nintendo Wii (often called a Wiimote) with existing geodynamic systems in an effort to eases interaction with these systems. Since these game controllers operate using Bluetooth, a common protocol in computing, Wiimotes can easily communicate with existing laptop computers that are issued to Maine students. This paper describes the technical requirements, setup, and usage of Wiimotes as an input device to complex geodynamical systems for use in the K-12 classroom.

  19. Scientists in the Classroom Mentor Model Program - Bringing real time science into the K - 12 classroom

    Science.gov (United States)

    Worssam, J. B.

    2017-12-01

    Field research finally within classroom walls, data driven, hands on with students using a series of electronic projects to show evidence of scientific mentor collaboration. You do not want to miss this session in which I will be sharing the steps to develop an interactive mentor program between scientists in the field and students in the classroom. Using next generation science standards and common core language skills you will be able to blend scientific exploration with scientific writing and communication skills. Learn how to make connections in your own community with STEM businesses, agencies and organizations. Learn how to connect with scientists across the globe to make your classroom instruction interactive and live for all students. Scientists, you too will want to participate, see how you can reach out and be a part of the K-12 educational system with students learning about YOUR science, a great component for NSF grants! "Scientists in the Classroom," a model program for all, bringing real time science, data and knowledge into the classroom.

  20. Expression of ultraviolet-induced restriction alleviation in Escherichia coli K-12

    International Nuclear Information System (INIS)

    Thoms, B.; Wackernagel, W.

    1983-01-01

    Ultraviolet-induced restriction alleviation is an SOS function which partially relieves the K-12-specific DNA restriction in Escherichia coli. Restriction alleviation is determined by observing elevated survival of unmodified phage lambda in cells irradiated with ultraviolet prior to infection. The authors demonstrate that restriction of lambda is also relieved when log-phase cells are irradiated as late as 50 min after adsorption of lambda. At this time more than 60% of the lambda DNA is already released as acid-soluble material from the cells. Experiments involving reextraction of lambda DNA from infected cells and a mild detergent treatment removing adsorbed phages from the cellular surface showed that only a small specific fraction of all lambda infections is destined to escape restriction due to restriction alleviation. This fraction (10-20%) has a retarded mode of DNA injection (60 min or longer) after adsorption which allows the expression of the restriction alleviation function before the phage DNA is exposed to restriction endonucleases. This behaviour of a fraction of lambda phages explains why the SOS function restriction alleviation could initially be discovered. The authors show that the retarded mode of DNA injection is not required for another SOS function acting on lambda DNA, the increased repair of ultraviolet-irradiated DNA (Weigle reactivation). (Auth.)

  1. High-Performance Schools: Affordable Green Design for K-12 Schools; Preprint

    Energy Technology Data Exchange (ETDEWEB)

    Plympton, P.; Brown, J.; Stevens, K.

    2004-08-01

    Schools in the United States spend $7.8 billion on energy each year-more than the cost of computers and textbooks combined, according to a 2003 report from the National Center for Education Statistics. The U.S. Department of Energy (DOE) estimates that these high utility bills could be reduced as much as 25% if schools adopt readily available high performance design principles and technologies. Accordingly, hundreds of K-12 schools across the country have made a commitment to improve the learning and teaching environment of schools while saving money and energy and protecting the environment. DOE and its public- and private-sector partners have developed Energy Design Guidelines for High Performance Schools, customized for nine climate zones in U.S. states and territories. These design guidelines provide information for school decision makers and design professionals on the advantages of energy efficiency and renewable energy designs and technologies. With such features as natural day lighting, efficient electric lights, water conservation, and renewable energy, schools in all types of climates are proving that school buildings, and the students and teachers who occupy them, are indeed high performers. This paper describes high performance schools from each of the nine climate zones associated with the Energy Design Guidelines. The nine case studies focus on the high performance design strategies implemented in each school, as well as the cost savings and benefits realized by students, faculty, the community, and the environment.

  2. W-reactivation of phage lambda in X-irradiated mutants of Escherichia coli K-12

    Energy Technology Data Exchange (ETDEWEB)

    Martignoni, K D; Haselbacher, I [Muenchen Univ. (Germany, F.R.). Strahlenbiologisches Inst.

    1980-07-01

    The survival of UV irradiated phage lambda was increased on X-irradiated E.coli K-12 host cells over that on unirradiated cells. The frequency of c mutants among the surviving phages was increased to a similar extent by the X-ray exposure of the host cells as by UV light. This W-reactivation of phage lambda occurred in uvrA, polA, and recB mutants besides the wild type at about equal X-ray doses, but at a reduced reactivation efficiency compared with the wild type. W-reactivation was undetectable in recA mutants. While maximal UV induced W-reactivation occured 30 min after irradiation, the maximal X-ray induced reactivation was found immediately after irradiation. Chloramphenicol (100 ..mu..g/ml) and nitrofurantoin (50 ..mu..g/ml) inhibited W-reactivation of phage lambda if added before irradiation of the host cells, indicating the necessity of protein synthesis for W-reactivation.

  3. Genes Required for Growth at High Hydrostatic Pressure in Escherichia coli K-12 Identified by Genome-Wide Screening

    Science.gov (United States)

    Black, S. Lucas; Dawson, Angela; Ward, F. Bruce; Allen, Rosalind J.

    2013-01-01

    Despite the fact that much of the global microbial biosphere is believed to exist in high pressure environments, the effects of hydrostatic pressure on microbial physiology remain poorly understood. We use a genome-wide screening approach, combined with a novel high-throughput high-pressure cell culture method, to investigate the effects of hydrostatic pressure on microbial physiology in vivo. The Keio collection of single-gene deletion mutants in Escherichia coli K-12 was screened for growth at a range of pressures from 0.1 MPa to 60 MPa. This led to the identification of 6 genes, rodZ, holC, priA, dnaT, dedD and tatC, whose products were required for growth at 30 MPa and a further 3 genes, tolB, rffT and iscS, whose products were required for growth at 40 MPa. Our results support the view that the effects of pressure on cell physiology are pleiotropic, with DNA replication, cell division, the cytoskeleton and cell envelope physiology all being potential failure points for cell physiology during growth at elevated pressure. PMID:24040140

  4. Escherichia coli K-12 pathogenicity in the pea aphid, Acyrthosiphon pisum, reveals reduced antibacterial defense in aphids.

    Science.gov (United States)

    Altincicek, Boran; Ter Braak, Bas; Laughton, Alice M; Udekwu, Klas I; Gerardo, Nicole M

    2011-10-01

    To better understand the molecular basis underlying aphid immune tolerance to beneficial bacteria and immune defense to pathogenic bacteria, we characterized how the pea aphid Acyrthosiphon pisum responds to Escherichia coli K-12 infections. E. coli bacteria, usually cleared in the hemolymph of other insect species, were capable of growing exponentially and killing aphids within a few days. Red fluorescence protein expressing E. coli K-12 laboratory strain multiplied in the aphid hemolymph as well as in the digestive tract, resulting in death of infected aphids. Selected gene deletion mutants of the E. coli K-12 predicted to have reduced virulence during systemic infections showed no difference in either replication or killing rate when compared to the wild type E. coli strain. Of note, however, the XL1-Blue E. coli K-12 strain exhibited a significant lag phase before multiplying and killing aphids. This bacterial strain has recently been shown to be more sensitive to oxidative stress than other E. coli K-12 strains, revealing a potential role for reactive oxygen species-mediated defenses in the otherwise reduced aphid immune system. Copyright © 2011 Elsevier Ltd. All rights reserved.

  5. 76 FR 5319 - Regulation of Fuel and Fuel Additives: Alternative Test Method for Olefins in Gasoline

    Science.gov (United States)

    2011-01-31

    ... Regulation of Fuel and Fuel Additives: Alternative Test Method for Olefins in Gasoline AGENCY: Environmental... gasoline. This proposed rule will provide flexibility to the regulated community by allowing an additional... A. Alternative Test Method for Olefins in Gasoline III. Statutory and Executive Order Reviews A...

  6. 76 FR 65382 - Regulation of Fuel and Fuel Additives: Alternative Test Method for Olefins in Gasoline

    Science.gov (United States)

    2011-10-21

    ... Regulation of Fuel and Fuel Additives: Alternative Test Method for Olefins in Gasoline AGENCY: Environmental... gasoline. This final rule will provide flexibility to the regulated community by allowing an additional... Method for Olefins in Gasoline III. Statutory and Executive Order Reviews A. Executive Order 12866...

  7. Team Mentoring for Interdisciplinary Team Science: Lessons From K12 Scholars and Directors.

    Science.gov (United States)

    Guise, Jeanne-Marie; Geller, Stacie; Regensteiner, Judith G; Raymond, Nancy; Nagel, Joan

    2017-02-01

    Mentoring is critical for academic success. As science transitions to a team science model, team mentoring may have advantages. The goal of this study was to understand the process, benefits, and challenges of team mentoring relating to career development and research. A national survey was conducted of Building Interdisciplinary Research Careers in Women's Health (BIRCWH) program directors-current and former scholars from 27 active National Institutes of Health (NIH)-funded BIRCWH NIH K12 programs-to characterize and understand the value and challenges of the team approach to mentoring. Quantitative data were analyzed descriptively, and qualitative data were analyzed thematically. Responses were received from 25/27 (93%) program directors, 78/108 (72%) current scholars, and 91/162 (56%) former scholars. Scholars reported that team mentoring was beneficial to their career development (152/169; 90%) and research (148/169; 88%). Reported advantages included a diversity of opinions, expanded networking, development of stronger study designs, and modeling of different career paths. Challenges included scheduling and managing conflicting opinions. Advice by directors offered to junior faculty entering team mentoring included the following: not to be intimidated by senior mentors, be willing to navigate conflicting advice, be proactive about scheduling and guiding discussions, have an open mind to different approaches, be explicit about expectations and mentors' roles (including importance of having a primary mentor to help navigate discussions), and meet in person as a team. These findings suggest that interdisciplinary/interprofessional team mentoring has many important advantages, but that skills are required to optimally utilize multiple perspectives.

  8. Strategies for Integrating Content from the USGCRP Climate and Health Assessment into the K-12 Classroom

    Science.gov (United States)

    Haine, D. B.

    2016-12-01

    That the physical environment shapes the lives and behaviors of people is certainly not news, but communicating the impact of a changing climate on human health and predicting the trajectory of these changes is an active area of study in public health. From air quality concerns to extreme heat to shifts in the range of disease vectors, there are many opportunities to make connections between Earth's changing climate and human health. While many science teachers understand that addressing human health impacts as a result of a changing climate can provide needed relevance, it can be challenging for teachers to do so given an already packed curriculum. This session will share instructional strategies for integrating content from the USGCRP Climate and Health Assessment (CHA) by enhancing, rather than displacing content related to climate science. This presentation will feature a data interpretation activity developed in collaboration with geoscientists at the University of North Carolina's Gillings School of Public Health to convey the connection between air quality, climate change and human health. This classroom activity invites students to read excerpts from the CHA and interpret data presented in the scientific literature, thus promoting scientific literacy. In summarizing this activity, I will highlight strategies for effectively engaging geoscientists in developing scientifically rigorous, STEM-focused educational activities that are aligned to state and national science standards and also address the realities of the science classroom. Collaborating with geoscientists and translating their research into classroom activities is an approach that becomes more pertinent with the advent of the Next Generation Science Standards (NGSS). Thus, the USGCRP Climate and Health Assessment represents an opportunity to cultivate science literacy among K-12 students while providing relevant learning experiences that promote integration of science and engineering practices as

  9. Assessment Strategies for Implementing Ngss in K12 Earth System Science Classrooms

    Science.gov (United States)

    McAuliffe, C.

    2016-12-01

    Several science education researchers have led assessment efforts that provide strategies particularly useful for evaluating the threedimensional learning that is central to NGSS (DeBarger, A. H., Penuel, W. R., Harris, C. J., Kennedy, C. K., 2016; Knight, A. M. & McNeill, K. L., 2015; McNeill, K. L., KatshSinger, R. & Pelletier, P., 2015; McNeill K.L., et.al., 2015; McNeill, K.L., & Krajcik, J.S., 2011; Penuel, W., 2016). One of the basic premises of these researchers is that, "Assessment is a practice of argument from evidence based on what students say, do, and write" and that "the classroom is the richest place to gather evidence of what students know (Penuel, W., 2016). The implementation of the NGSS in Earth System Science provides a unique opportunity for geoscience education researchers to study student learning and contribute to the development of this research as well as for geoscience educators to apply these approaches and strategies in their own work with K12 inservice and preservice educators. DeBarger, A. H., Penuel, W. R., Harris, C. J., Kennedy, C. K. (2016). Building an Assessment Argument to Design and Use Next Generation Science Assessments in Efficacy Studies of Curriculum Interventions. American†Journal†of†Evaluation†37(2) 174192Æ Knight, A. M. & McNeill, K. L. (2015). Comparing students' individual written and collaborative oral socioscientific arguments. International Journal of Environmental and Science Education.10(5), 23647. McNeill, K. L., KatshSinger, R. & Pelletier, P. (2015). Assessing science practices-Moving your class along a continuum. Science Scope. McNeill, K.L., & Krajcik, J.S. (2011). Supporting Grade 5-8 Students in Constructing Explanations in Science: The Claim, Evidence, and Reasoning Framework for Talk and Writing. Upper Saddle River, New Jersey: Pearson. Penuel, W. (2016). Classroom Assessment Strategies for NGSS Earth and Space Sciences. Implementing†the†NGSS†Webinar†Series, February 11, 2016.

  10. C-MORE Science Kits: Putting Technology in the Hands of K-12 Teachers and Students

    Science.gov (United States)

    Achilles, K.; Weersing, K.; Daniels, C.; Puniwai, N.; Matsuzaki, J.; Bruno, B. C.

    2008-12-01

    The Center for Microbial Oceanography: Research and Education (C-MORE) is a NSF Science and Technology Center based at the University of Hawaii. The C-MORE education and outreach program offers a variety of resources and professional development opportunities for science educators, including online resources, participation in oceanography research cruises, teacher-training workshops, mini-grants to incorporate microbial oceanography-related content and activities into their classroom and, most recently, C- MORE science kits. C-MORE science kits provide hands-on classroom, field, and laboratory activities related to microbial oceanography for K-12 students. Each kit comes with complete materials and instructions, and is available free of charge to Hawaii's public school teachers. Several kits are available nationwide. C-MORE science kits cover a range of topics and technologies and are targeted at various grade levels. Here is a sampling of some available kits: 1) Marine Murder Mystery: The Case of the Missing Zooxanthellae. Students learn about the effect of climate change and other environmental threats on coral reef destruction through a murder-mystery experience. Participants also learn how to use DNA to identify a suspect. Grades levels: 3-8. 2) Statistical sampling. Students learn basic statistics through an exercise in random sampling, with applications to microbial oceanography. The laptops provided with this kit enable students to enter, analyze, and graph their data using EXCEL. Grades levels: 6-12. 3) Chlorophyll Lab. A research-quality fluorometer is used to measure the chlorophyll content in marine and freshwater systems. This enables students to compare biomass concentrations in samples collected from various locations. Grades levels: 9-12. 4) Conductivity-Temperature-Depth (CTD). Students predict how certain variables (e.g., temperature, pressure, chlorophyll, oxygen) vary with depth. A CTD, attached to a laptop computer, is deployed into deep water

  11. Good Morning from Barrow, Alaska! Helping K-12 students understand the importance of research

    Science.gov (United States)

    Shelton, M.

    2010-12-01

    This presentation focuses on how an educator experiences scientific research and how those experiences can help foster K-12 students’ understanding of research being conducted in Barrow, Alaska. According to Zhang and Fulford (1994), real-time electronic field trips help to provide a sense of closeness and relevance. In combination with experts in the field, the electronic experience can help students to better understand the phenomenon being studied, thus strengthening the student’s conceptual knowledge (Zhang & Fulford, 1994). During a seven day research trip to study the arctic sea ice, five rural Virginia teachers and their students participated in Skype sessions with the participating educator and other members of the Radford University research team. The students were able to view the current conditions in Barrow, listen to members of the research team describe what their contributions were to the research, and ask questions about the research and Alaska in general. Collaborations between students and scientist can have long lasting benefits for both educators and students in promoting an understanding of the research process and understanding why our world is changing. By using multimedia venues such as Skype students are able to interact with researchers both visually and verbally, forming the basis for students’ interest in science. A learner’s level of engagement is affected by the use of multimedia, especially the level of cognitive processing. Visual images alone do no promote the development of good problem solving skills. However, the students are able to develop better problem solving skills when both visual images and verbal interactions are used together. As students form higher confidence levels by improving their ability to problem solve, their interest in science also increases. It is possible that this interest could turn into a passion for science, which could result in more students wanting to become scientists or science teachers.

  12. Muchas Caras: Engaging Spanish Speakers in the Planetarium and K-12 Classroom

    Science.gov (United States)

    Traub-Metlay, Suzanne; Salas, F.

    2008-05-01

    Reaching out to Spanish speakers is increasingly vital to workforce development and public support of space science projects. Fiske Planetarium offers Spanish translations of our newest planetarium shows, such as "Las Muchas Caras del Telescopio Hubble” ("The Many Faces of Hubble") and "Tormenta Espacial” ("Space Storm"). Funded by NASA, "Las Muchas Caras...” showcases the people involved in successful use of the Hubble Space Telescope. From building and launching HST to how proposals are selected and data analyzed, "Las Muchas Caras...” engages viewers to see themselves in careers related to space science. Detailed interviews with real people who work with HST reveal the humanity behind the science. Awesome imagery provided by HST inspires viewers to look at the night sky themselves. In partnership with NASA's TIMED mission, LASP and Space Science Institute, Fiske Planetarium translated its original planetarium show - "Space Storm” - into "Tormenta Espacial". This show explores the Sun-Earth connection and explains how solar activity affects technology and life on Earth. Solar scientists from NOAA's Space Environment Center and the University of Colorado at Boulder contributed to provide scientific accuracy. Show content and accompanying educational materials are aligned with state and national science standards. Curricular materials extend the planetarium experience into the K-12 classroom so that students inspired and engaged by the show continue to see real-life applications and workplace opportunities. Fiske Planetarium offers "Las Muchas Caras...” and "Tormenta Espacial” to other planetariums at a minimal rate, including technical support for the life of the show. Versions of "The Many Faces of Hubble” and "Space Storm” are available with no spoken dialogue so that languages other than English or Spanish may be accommodated.

  13. Respiration shutoff in Escherichia coli K12 strains is induced by far ultraviolet radiations and by mitomycin C

    International Nuclear Information System (INIS)

    Swenson, P.A.; Norton, I.L.

    1984-01-01

    Near ultraviolet radiations (UV) cause respiration to shutoff in Escherichia coli B/r. It has been reported that E. coli K12 strains do not shut off respiration after UV. It is also reported that mitomycin C did not cause this 'SOS' response. In this paper it is reported that higher UV fluences than were previously used will cause respiration shutoff in K12 strain W3110 and that cyclic AMP increases the sensitivity of respiration shutoff of irradiated cell suspensions. Also mitomycin C shuts off respiration in this strain. Neither UV nor mitomycin C causes respiration shutoff in the recA56 derivative of W3110. Thus respiration shutoff is a recA dependent response to UV and mitomycin C in E. coli K12 strains. (Auth.)

  14. The GLOBE Carbon Project: Integrating the Science of Carbon Cycling and Climate Change into K-12 Classrooms.

    Science.gov (United States)

    Ollinger, S. V.; Silverberg, S.; Albrechtova, J.; Freuder, R.; Gengarelly, L.; Martin, M.; Randolph, G.; Schloss, A.

    2007-12-01

    The global carbon cycle is a key regulator of the Earth's climate and is central to the normal function of ecological systems. Because rising atmospheric CO2 is the principal cause of climate change, understanding how ecosystems cycle and store carbon has become an extremely important issue. In recent years, the growing importance of the carbon cycle has brought it to the forefront of both science and environmental policy. The need for better scientific understanding has led to establishment of numerous research programs, such as the North American Carbon Program (NACP), which seeks to understand controls on carbon cycling under present and future conditions. Parallel efforts are greatly needed to integrate state-of-the-art science on the carbon cycle and its importance to climate with education and outreach efforts that help prepare society to make sound decisions on energy use, carbon management and climate change adaptation. Here, we present a new effort that joins carbon cycle scientists with the International GLOBE Education program to develop carbon cycle activities for K-12 classrooms. The GLOBE Carbon Cycle project is focused on bringing cutting edge research and research techniques in the field of terrestrial ecosystem carbon cycling into the classroom. Students will collect data about their school field site through existing protocols of phenology, land cover and soils as well as new protocols focused on leaf traits, and ecosystem growth and change. They will also participate in classroom activities to understand carbon cycling in terrestrial ecosystems, these will include plant- a-plant experiments, hands-on demonstrations of various concepts, and analysis of collected data. In addition to the traditional GLOBE experience, students will have the opportunity to integrate their data with emerging and expanding technologies including global and local carbon cycle models and remote sensing toolkits. This program design will allow students to explore research

  15. Integrating NASA Dryden Research Endeavors into the Teaching-Learning of Mathematics in the K-12 Classroom via the WWW

    Science.gov (United States)

    Ward, Robin A.

    2002-01-01

    The primary goal of this project was to continue populating the currently existing web site developed in 1998 in conjunction with the NASA Dryden Flight Research Center and California Polytechnic State University, with more mathematics lesson plans and activities that K-12 teachers, students, home-schoolers, and parents could access. All of the activities, while demonstrating some mathematical topic, also showcase the research endeavors of the NASA Dryden Flight Research Center. The website is located at: http://daniel.calpoly.edu/dfrc/Robin. The secondary goal of this project was to share the web-based activities with educators at various conferences and workshops. To address the primary goal of this project, over the past year, several new activities were posted on the web site and some of the existing activities were enhanced to contain more video clips, photos, and materials for teachers. To address the project's secondary goal, the web-based activities were showcased at several conferences and workshops. Additionally, in order to measure and assess the outreach impact of the web site, a link to the web site hitbox.com was established in April 2001, which allowed for the collection of traffic statistics against the web site (such as the domains of visitors, the frequency of visitors to this web site, etc.) Provided is a description of some of the newly created activities posted on the web site during the project period of 2001-2002, followed by a description of the conferences and workshops at which some of the web-based activities were showcased. Next is a brief summary of the web site's traffic statistics demonstrating its worldwide educational impact, followed by a listing of some of the awards and accolades the web site has received.

  16. One Model for Scientist Involvement in K-12 Education: Teachers Experiencing Antarctica and the Arctic Program

    Science.gov (United States)

    Meese, D.; Shipp, S. S.; Porter, M.; Bruccoli, A.

    2002-12-01

    Scientists involved in the NSF-funded Teachers Experiencing Antarctica and the Arctic (TEA) Program integrate a K-12 science teacher into their polar field project. Objectives of the program include: having the science teacher immersed in the experience of research; 2) through the teacher, leveraging the research experience to better inform teaching practices; and 3) sharing the experience with the broader educational and general community. The scientist - or qualified team member - stays involved with the teacher throughout the program as a mentor. Preparation of the teacher involves a week-long orientation presented by the TEA Program, and a two week pre-expedition visit at the scientist's institution. Orientation acquaints teachers with program expectations, logistical information, and an overview of polar science. While at the scientist's institution, the teacher meets the team, prepares for the field, and strengthens content knowledge. In the field, the teacher is a team member and educational liaison, responding to questions from students and colleagues by e-mail, and posting electronic journals describing the research experience. Upon return, the teachers work closely with colleagues to bring the experience of research into classrooms through creation of activities, design of longer-term student investigations, and presentations at scientific, educational, and community meetings. Interaction with the scientific team continues with a visit by the scientist to the teacher's classrooms, collaboration on presentations at scientific meetings, and consultation on classroom activities. In some cases, the teacher may participate in future expeditions. The involvement by scientists in mentor relationships, such as those of the TEA Program, is critical to improving science education. Many teachers of science have not had the opportunity to participate in field research, which offers valuable first-hand experience about the nature of science, as well as about specific

  17. Evaluation of Experiential Outdoor Research Locations in Asia for a K-12 school in Hong Kong

    Science.gov (United States)

    Ibarra, D. L.; Joyce, S.

    2016-12-01

    A team of faculty and administrators from The Independent Schools Foundation Academy spend the 2015 - 2016 academic year identifying possible locations in Asia for a year-round outdoor education center. ISF Academy currently has over 1500 students its K-12 bilingual school in Hong Kong, China. The outdoor education center is an extension of the built campus in Pokfulam and will provide students opportunities to live in a natural setting, participate in outdoor educational activities and study in an environment significantly different than a classroom. Currently ISF Academy students in grades 4 - 12 are off campus twice during the academic year in an experiential learning environment. These current programs include camping, hiking, kayaking, other adventurous activities and service learning opportunities. The purpose of the dedicated site is to have a "home base" for ISF Academy and the experiential learning programs. This past year we looked specifically at programs and locations that could also be used by students for ecology and earth systems based research in the senior school (grades 9 - 12). We have looked at sites in Hong Kong, Indonesia, Malaysia and Taiwan. The ideal site will have marine, terrestrial and mangrove ecosystems and allow students to set up long-term research sites in any of these ecosystems. Creating opportunities for authentic research that allows students spend an extended time in a research setting will help them to gain both skills and independence needed in the future at the tertiary level. The evaluation of these sites included identifying potential research partners, site preparation, logistics in and out of the locations, and the heath/safety management of students living and working in a remote location. In parallel to the site evaluations, the curriculum is being developed for the students that is age and skill appropriate using the frame work of the existing guided discovery curriculum in the primary school, and the MYP and DP

  18. Evaluation of polymer micro parts produced by additive manufacturing processes using vat photopolymerization method

    DEFF Research Database (Denmark)

    Davoudinejad, Ali; Pedersen, David Bue; Tosello, Guido

    2017-01-01

    Micro manufacturing scale feature production by Additive Manufacturing (AM) processes for the direct production of miniaturized polymer components is analysed in this work. The study characterizes the AM processes for polymer micro parts productions using the vat photopolymerization method...

  19. Integrating Online GIS into the K-12 Curricula: Lessons from the Development of a Collaborative GIS in Michigan

    Science.gov (United States)

    Henry, Paul; Semple, Hugh

    2012-01-01

    GIS has shown promise in Project Based Learning (PBL) environments, but many obstacles exist in its integration into school curriculums. This article discusses the development and utilization of an online GIS tool that was created to illustrate that the perceptual gap between relevance and ease of use of GIS software can be bridged at the K-12

  20. A Review of Research on Content-Based Foreign/Second Language Education in US K-12 Contexts

    Science.gov (United States)

    Tedick, Diane J.; Wesely, Pamela M.

    2015-01-01

    This review of the extant research literature focuses on research about content-based language instruction (CBI) programmes in K-12 foreign/second language education in the USA. The review emphasises studies on one-way language immersion (OWI) and two-way language immersion (TWI) programmes, which are school-based and subject matter-driven. OWI…

  1. Preparing for the Flu (Including 2009 H1N1 Flu): A Communication Toolkit for Schools (Grades K-12)

    Science.gov (United States)

    Centers for Disease Control and Prevention, 2010

    2010-01-01

    The purpose of "Preparing for the Flu: A Communication Toolkit for Schools" is to provide basic information and communication resources to help school administrators implement recommendations from CDC's (Centers for Disease Control and Prevention) Guidance for State and Local Public Health Officials and School Administrators for School (K-12)…

  2. Identifying a Statistical Model for North Dakota K-12 Public School Transportation Funding by Comparing Fifteen State Transportation Funding Formulas

    Science.gov (United States)

    Holen, Steven M.

    2012-01-01

    The purpose of this study was to review the history of North Dakota K-12 transportation funding system, identify how school districts are reimbursed for transportation expenses, and compare this information with fourteen other state transportation funding systems. North Dakota utilizes a block grant structure that has been in place since 1972 and…

  3. Feedback from the Field: What Novice PreK-12 ESL Teachers Want to Tell TESOL Teacher Educators

    Science.gov (United States)

    Baecher, Laura

    2012-01-01

    Programs in the United States that certify PreK-12 teachers in English as a second language (ESL) must meet high and consistent standards in their preservice preparation. However, there is little empirical evidence on the degree to which such preparation actually meets the needs of teachers once they begin their careers. Teaching English to…

  4. Implementing Network Video for Traditional Security and Innovative Applications: Best Practices and Uses for Network Video in K-12 Schools

    Science.gov (United States)

    Wren, Andrew

    2008-01-01

    Administrators are constantly seeking ways to cost-effectively and adequately increase security and improve efficiency in K-12 schools. While video is not a new tool to schools, the shift from analog to network technology has increased the accessibility and usability in a variety of applications. Properly installed and used, video is a powerful…

  5. An Ecological Approach to a University Course that Develops Partnerships Impacting Health and Wellness in K-12 Schools and Communities

    Science.gov (United States)

    Shields, Sharon L.; Gilchrist, Leigh Z.; Nixon, Carol T.; Holland, Barbara A.; Thompson, Elizabeth A.

    2013-01-01

    Over the past several decades, there has been an increased focus on health promotion as opposed to individual health determinants and disease prevention. Given the association between health and academic success, health promotion is a vastly overlooked lever for establishing effective K-12 schools. Student, organizational, and community well-being…

  6. Initial Assessment for K-12 English Language Support in Six Countries: Revisiting the Validity-Reliability Paradox

    Science.gov (United States)

    Sinclair, Jeanne; Lau, Clarissa

    2018-01-01

    It is common practice for K-12 schools to assess multilingual students' language proficiency to determine language support program placement. Because such programs can provide essential scaffolding, the policies guiding these assessments merit careful consideration. It is well accepted that quality assessments must be valid (representative of the…

  7. Teaching and Learning about Complex Systems in K-12 Science Education: A Review of Empirical Studies 1995-2015

    Science.gov (United States)

    Yoon, Susan A.; Goh, Sao-Ee; Park, Miyoung

    2018-01-01

    The study of complex systems has been highlighted in recent science education policy in the United States and has been the subject of important real-world scientific investigation. Because of this, research on complex systems in K-12 science education has shown a marked increase over the past two decades. In this systematic review, we analyzed 75…

  8. Infusing Multicultural Education into the Curriculum: Preparing Pre-Service Teachers to Address Homophobia in K-12 Schools

    Science.gov (United States)

    Jones, Joseph R.

    2015-01-01

    This article discusses the role multicultural education can play in addressing homophobia in K-12 schools. The author explores the lack of multiculturalism courses in undergraduate teacher education programs. To address the lack of multiculturalism courses, three instructional activities are offered that faculty in teacher education programs can…

  9. Listening to Graduates of a K-12 Bilingual Program: Language Ideologies and Literacy Practices of Former Bilingual Students

    Science.gov (United States)

    Dworin, Joel

    2011-01-01

    This study investigated the language and literacy practices of five graduates of a Spanish-English K-12 dual language immersion program through semistructured interviews to understand the residual impact of thirteen years in a Spanish-English bilingual school program. Drawing from sociocultural theory, the interviews also sought to provide an…

  10. The Effect of Participation in Professional Development on Perceived Change in Teaching Practice by Minnesota K-12 Physical Education Teachers

    Science.gov (United States)

    Sertich, Sally Krause

    2013-01-01

    This study used a conceptual framework of professional development theory to identify characteristics of effective learning activities specific to 259 Minnesota K-12 public school physical education and developmental adapted physical education (PE/DAPE) teachers during 2012-2013. Study results confirmed that as PE/DAPE teacher participation in…

  11. A FIRST STEP TOWARDS THE IMPLEMENTATION OF THE CAMBRIDGE MATHEMATICS CURRICULUM IN A K-12 UNGRADED SCHOOL.

    Science.gov (United States)

    FOSTER, GARRETT R.

    A SERIES OF THREE CONFERENCES WAS HELD TO EXPLORE THE FEASIBILITY OF IMPLEMENTING A LONG-RANGE CURRICULUM DEVELOPMENT PROJECT FOR AN UNGRADED, K-12 SCHOOL, BASED ON RECOMMENDATIONS OF THE CAMBRIDGE CONFERENCE ON SCHOOL MATHEMATICS. OVER 50 MATHEMATICIANS, MATHEMATICS EDUCATORS, AND PERSONS INVOLVED IN THEORETICAL AND APPLIED PSYCHOLOGICAL…

  12. The Elephant in the (Class)Room: Parental Perceptions of LGBTQ-Inclusivity in K-12 Educational Contexts

    Science.gov (United States)

    Ullman, Jacqueline; Ferfolja, Tania

    2016-01-01

    While little is known about parental beliefs and desires regarding LGBTQ-inclusive education, assumptions about these appear to justify teachers', curriculum writers' and policy makers' silences regarding sexuality and gender diversity in the K-12 classroom. Thus, in order to better inform educators' practices, this paper presents an analysis of…

  13. Increasing the Roles and Significance of Teachers in Policymaking for K-12 Engineering Education: Proceedings of a Convocation

    Science.gov (United States)

    Olson, Steve

    2017-01-01

    Engineering is a small but growing part of K-12 education. Curricula that use the principles and practices of engineering are providing opportunities for elementary, middle, and high school students to design solutions to problems of immediate practical and societal importance. Professional development programs are showing teachers how to use…

  14. The Experiences of School Counselors in Reducing Relational Aggression among Female Students K-12: A Generic Qualitative Study

    Science.gov (United States)

    Stringer, Tomeka C.

    2014-01-01

    The current generic qualitative study investigated the experiences of eight K-12 school counselors working with female students and relational aggression. School counselors can be a resource in schools to help students that may have been involved with relational aggression incidents. They can collaborate with administrators, teachers, parents, and…

  15. Mobile STEMship Discovery Center: K-12 Aerospace-Based Science, Technology, Engineering, and Mathematics (STEM) Mobile Teaching Vehicle

    Science.gov (United States)

    2015-08-03

    AND SUBTITLE Mobile STEMship Discovery Center: K-12 Aerospace-Based Science, Technology, Engineering, and Mathematics (STEM) Mobile Teaching Vehicle...Center program to be able to expose Science Technology, Engineering and Mathematics (STEM) space-inspired science centers for DC Metro beltway schools

  16. Measurement Invariance of Second-Order Factor Model of the Multifactor Leadership Questionnaire (MLQ) across K-12 Principal Gender

    Science.gov (United States)

    Xu, Lihua; Wubbena, Zane; Stewart, Trae

    2016-01-01

    Purpose: The purpose of this paper is to investigate the factor structure and the measurement invariance of the Multifactor Leadership Questionnaire (MLQ) across gender of K-12 school principals (n=6,317) in the USA. Design/methodology/approach: Nine first-order factor models and four second-order factor models were tested using confirmatory…

  17. Proposed Model for a Streamlined, Cohesive, and Optimized K-12 STEM Curriculum with a Focus on Engineering

    Science.gov (United States)

    Locke, Edward

    2009-01-01

    This article presents a proposed model for a clear description of K-12 age-possible engineering knowledge content, in terms of the selection of analytic principles and predictive skills for various grades, based on the mastery of mathematics and science pre-requisites, as mandated by national or state performance standards; and a streamlined,…

  18. Teaching Decolonial Sounds on the Margins: Reflections on a K-12 Teacher Workshop Covering Black & Brown Musical Transculturation in Texas

    Science.gov (United States)

    Cervantes, Marco Antonio

    2015-01-01

    To demonstrate the significance of cultural crossings in Texas and how cultural exchanges can inform teachers and students in the areas of history, fine arts, geography, and social studies, the author constructed a Summer 2013 teacher workshop for Texas K-12 teachers through the Smithsonian Affiliated Institute of Texan Cultures. The author…

  19. Integration of Geospatial Technologies into K-12 Curriculum: An Investigation of Teacher and Student Perceptions and Student Academic Achievement

    Science.gov (United States)

    Goldstein, Donna L.

    2010-01-01

    The purpose of this study was to explore outcomes of a GIS/GPS integration process: to (a) examine student responses to GIS and GPS inclusion in their curriculum, (b) determine whether a relationship exists between inclusion of GIS into existing K-12 curriculum and student achievement, (c) examine the effectiveness of GIS professional development…

  20. Exploring Relationships between K-12 Music Educators' Demographics, Perceptions of Intrapreneuring, and Motivation at Work

    Science.gov (United States)

    Hanson, Josef

    2017-01-01

    Gifford Pinchot III coined the term "intrapreneur" to recognize "dreamers who do": individuals who transform ideas into new endeavors within existing organizations. The purpose of this study was to gauge the salience of intrapreneuring for K-12 music teachers and examine how its attributes and behaviors relate to teachers'…

  1. Prioritization of K-12 World Language Education in the United States: State Requirements for High School Graduation

    Science.gov (United States)

    O'Rourke, Polly; Zhou, Qian; Rottman, Isaac

    2016-01-01

    In view of the importance of increasing multilingualism in the United States, the current study examined state policy for high school graduation requirements in the 50 states and the District of Columbia as an index of the way in which the study of world language is positioned and prioritized in K--12 education. Only seven states require the study…

  2. A Review of Computer Science Resources for Learning and Teaching with K-12 Computing Curricula: An Australian Case Study

    Science.gov (United States)

    Falkner, Katrina; Vivian, Rebecca

    2015-01-01

    To support teachers to implement Computer Science curricula into classrooms from the very first year of school, teachers, schools and organisations seek quality curriculum resources to support implementation and teacher professional development. Until now, many Computer Science resources and outreach initiatives have targeted K-12 school-age…

  3. OER Quality and Adaptation in K-12: Comparing Teacher Evaluations of Copyright-Restricted, Open, and Open/Adapted Textbooks

    Science.gov (United States)

    Kimmons, Royce

    2015-01-01

    Conducted in conjunction with an institute on open textbook adaptation, this study compares textbook evaluations from practicing K-12 classroom teachers (n = 30) on three different types of textbooks utilized in their contexts: copyright-restricted, open, and open/adapted. Copyright-restricted textbooks consisted of those textbooks already in use…

  4. A Meta-Analysis of the Effectiveness of Intelligent Tutoring Systems on K-12 Students' Mathematical Learning

    Science.gov (United States)

    Steenbergen-Hu, Saiying; Cooper, Harris

    2013-01-01

    In this study, we meta-analyzed empirical research of the effectiveness of intelligent tutoring systems (ITS) on K-12 students' mathematical learning. A total of 26 reports containing 34 independent samples met study inclusion criteria. The reports appeared between 1997 and 2010. The majority of included studies compared the effectiveness of ITS…

  5. Guided by Principles: Shaping the State of California's Role in K-12 Public School Facility Funding. Policy Research Working Paper

    Science.gov (United States)

    Center for Cities & Schools, 2015

    2015-01-01

    The Governor, members of the legislature and other key stakeholders have identified concerns about the State of California's approach to funding K-12 school facilities, but they have not yet formulated a consensus going forward on the state role and responsibilities for school district facilities. To inform the school facilities funding policy…

  6. Music Educator Vacancies in Faith-Based K-12 Schools in the United States: 2013-2014

    Science.gov (United States)

    Hash, Phillip M.

    2015-01-01

    The purpose of this study was to analyze and summarize characteristics of music educator vacancies in faith-based K-12 schools in the United States for the 2013-2014 academic year. Data extracted from placement notices and supplemental sources included demographic information, job responsibilities, and employment requirements for 153 listings in…

  7. A Path to Alignment: Connecting K-12 and Higher Education via the Common Core and the Degree Qualifications Profile

    Science.gov (United States)

    Conley, David T.; Gaston, Paul L.

    2013-01-01

    The Common Core State Standards (CCSS), which aim to assure competency in English/language arts and mathematics through the K-12 curriculum, define necessary but not sufficient preparedness for success in college. The Degree Qualifications Profile (DQP), which describes what a college degree should signify, regardless of major, offers useful but…

  8. The Perceived Work Ethic of K-12 Teachers by Generational Status: Generation X vs. Baby Boom Generation

    Science.gov (United States)

    Petty, Gregory C.

    2013-01-01

    This was an investigation of the work ethic of K-12 educators from Generation X and Baby Boomer generations. Teachers of the baby boom generation were born between 1946 and 1964, and many are beginning to retire. There is an impending teacher shortage due to the large numbers of this group retiring or leaving the profession. School administrators…

  9. Learning to Teach Online: A Systematic Review of the Literature on K-12 Teacher Preparation for Teaching Online

    Science.gov (United States)

    Moore-Adams, Brianne L.; Jones, W. Monty; Cohen, Jonathan

    2016-01-01

    There is a growing need for qualified online instructors to teach the expanding population of online K-12 students. To meet this need, teachers must be provided learning opportunities to acquire the specific types of knowledge and skills necessary to teach online. In this systematic review of the literature, we utilize the TPACK framework to…

  10. CT image segmentation methods for bone used in medical additive manufacturing.

    Science.gov (United States)

    van Eijnatten, Maureen; van Dijk, Roelof; Dobbe, Johannes; Streekstra, Geert; Koivisto, Juha; Wolff, Jan

    2018-01-01

    The accuracy of additive manufactured medical constructs is limited by errors introduced during image segmentation. The aim of this study was to review the existing literature on different image segmentation methods used in medical additive manufacturing. Thirty-two publications that reported on the accuracy of bone segmentation based on computed tomography images were identified using PubMed, ScienceDirect, Scopus, and Google Scholar. The advantages and disadvantages of the different segmentation methods used in these studies were evaluated and reported accuracies were compared. The spread between the reported accuracies was large (0.04 mm - 1.9 mm). Global thresholding was the most commonly used segmentation method with accuracies under 0.6 mm. The disadvantage of this method is the extensive manual post-processing required. Advanced thresholding methods could improve the accuracy to under 0.38 mm. However, such methods are currently not included in commercial software packages. Statistical shape model methods resulted in accuracies from 0.25 mm to 1.9 mm but are only suitable for anatomical structures with moderate anatomical variations. Thresholding remains the most widely used segmentation method in medical additive manufacturing. To improve the accuracy and reduce the costs of patient-specific additive manufactured constructs, more advanced segmentation methods are required. Copyright © 2017 IPEM. Published by Elsevier Ltd. All rights reserved.

  11. Earth system science K-12 scientist-student partnerships using paleontological materials

    Science.gov (United States)

    Harnik, P. G.; Ross, R. M.; Chiment, J. J.; Sherpa, J. M.

    2001-05-01

    Reducing the discrepancy between the dynamic science that researchers experience and the static fact-driven science education in which k-12 students participate at school is an important component to national science education reform. Scientist-student partnerships (SSPs) involving whole classes in Earth systems research provide a solution to this problem, but existing models have often lacked rigorous scientific data quality control and/or evaluation of pedagogical effectiveness. The Paleontological Research Institution has been prototyping two SSPs with an eye toward establishing protocols to insure both scientific and educational quality of the partnership. Data quality analysis involves making statistical estimates of data accuracy and employing robust statistical techniques for answering essential questions with noisy data. Educational evaluation takes into account affective variables, such as student motivation and interest, and compares the relative pedagogical effectiveness of SSPs with more traditional hands-on activities. Paleontology is a natural subject for scientist-student partnerships because of its intrinsic appeal to the general public, and because its interdisciplinary content serves as a springboard for meeting science education standards across the physical and life sciences. The "Devonian Seas" SSP involves classes in identifying fossil taxa and assessing taphonomic characteristics from Devonian-aged Hamilton Group shales in Central New York. The scientific purpose of the project is to establish at high stratigraphic resolution the sequence of dysoxic biofacies composition, which will shed light on the sensitivity of epeiric sea communities to environmental (e.g., sea level) changes. The project is undertaken in upper elementary school and secondary school Earth science classes, and in some cases has involved field-based teacher training and collection of samples. Students in small teams collaborate to identify taxa within the samples, then

  12. Acid Evolution of Escherichia coli K-12 Eliminates Amino Acid Decarboxylases and Reregulates Catabolism.

    Science.gov (United States)

    He, Amanda; Penix, Stephanie R; Basting, Preston J; Griffith, Jessie M; Creamer, Kaitlin E; Camperchioli, Dominic; Clark, Michelle W; Gonzales, Alexandra S; Chávez Erazo, Jorge Sebastian; George, Nadja S; Bhagwat, Arvind A; Slonczewski, Joan L

    2017-06-15

    Acid-adapted strains of Escherichia coli K-12 W3110 were obtained by serial culture in medium buffered at pH 4.6 (M. M. Harden, A. He, K. Creamer, M. W. Clark, I. Hamdallah, K. A. Martinez, R. L. Kresslein, S. P. Bush, and J. L. Slonczewski, Appl Environ Microbiol 81:1932-1941, 2015, https://doi.org/10.1128/AEM.03494-14). Revised genomic analysis of these strains revealed insertion sequence (IS)-driven insertions and deletions that knocked out regulators CadC (acid induction of lysine decarboxylase), GadX (acid induction of glutamate decarboxylase), and FNR (anaerobic regulator). Each acid-evolved strain showed loss of one or more amino acid decarboxylase systems, which normally help neutralize external acid (pH 5 to 6) and increase survival in extreme acid (pH 2). Strains from populations B11, H9, and F11 had an IS 5 insertion or IS-mediated deletion in cadC , while population B11 had a point mutation affecting the arginine activator adiY The cadC and adiY mutants failed to neutralize acid in the presence of exogenous lysine or arginine. In strain B11-1, reversion of an rpoC (RNA polymerase) mutation partly restored arginine-dependent neutralization. All eight strains showed deletion or downregulation of the Gad acid fitness island. Strains with the Gad deletion lost the ability to produce GABA (gamma-aminobutyric acid) and failed to survive extreme acid. Transcriptome sequencing (RNA-seq) of strain B11-1 showed upregulated genes for catabolism of diverse substrates but downregulated acid stress genes (the biofilm regulator ariR , yhiM , and Gad). Other strains showed downregulation of H 2 consumption mediated by hydrogenases ( hya and hyb ) which release acid. Strains F9-2 and F9-3 had a deletion of fnr and showed downregulation of FNR-dependent genes ( dmsABC , frdABCD , hybABO , nikABCDE , and nrfAC ). Overall, strains that had evolved in buffered acid showed loss or downregulation of systems that neutralize unbuffered acid and showed altered regulation of

  13. Efectivity of Additive Spline for Partial Least Square Method in Regression Model Estimation

    Directory of Open Access Journals (Sweden)

    Ahmad Bilfarsah

    2005-04-01

    Full Text Available Additive Spline of Partial Least Square method (ASPL as one generalization of Partial Least Square (PLS method. ASPLS method can be acommodation to non linear and multicollinearity case of predictor variables. As a principle, The ASPLS method approach is cahracterized by two idea. The first is to used parametric transformations of predictors by spline function; the second is to make ASPLS components mutually uncorrelated, to preserve properties of the linear PLS components. The performance of ASPLS compared with other PLS method is illustrated with the fisher economic application especially the tuna fish production.

  14. Biogenic synthesis and characterization of gold nanoparticles by Escherichia coli K12 and its heterogeneous catalysis in degradation of 4-nitrophenol

    Science.gov (United States)

    Srivastava, Sarvesh Kumar; Yamada, Ryosuke; Ogino, Chiaki; Kondo, Akihiko

    2013-02-01

    Room-temperature extracellular biosynthesis of gold nanoparticles (Au NPs) was achieved using Escherichia coli K12 cells without the addition of growth media, pH adjustments or inclusion of electron donors/stabilizing agents. The resulting nanoparticles were analysed by ultraviolet-visible (UV-vis) spectrophotometry, atomic force microscopy, transmission electron microscopy and X-ray diffraction. Highly dispersed gold nanoplates were achieved in the order of around 50 nm. Further, the underlying mechanism was found to be controlled by certain extracellular membrane-bound proteins, which was confirmed by Fourier transformation-infrared spectroscopy and sodium dodecyl sulfate polyacrylamide gel electrophoresis. We observed that certain membrane-bound peptides are responsible for reduction and subsequent stabilization of Au NPs (confirmed by zeta potential analysis). Upon de-activation of these proteins, no nanoparticle formation was observed. Also, we prepared a novel biocatalyst with Au NPs attached to the membrane-bound fraction of E. coli K12 cells serving as an efficient heterogeneous catalyst in complete reduction of 4-nitrophenol in the presence of NaBH4 which was studied with UV-vis spectroscopy. This is the first report on bacterial membrane-Au NP nanobiocomposite serving as an efficient heterogeneous catalyst in complete reduction of nitroaromatic pollutant in water.

  15. Comparison of prosthetic models produced by traditional and additive manufacturing methods.

    Science.gov (United States)

    Park, Jin-Young; Kim, Hae-Young; Kim, Ji-Hwan; Kim, Jae-Hong; Kim, Woong-Chul

    2015-08-01

    The purpose of this study was to verify the clinical-feasibility of additive manufacturing by comparing the accuracy of four different manufacturing methods for metal coping: the conventional lost wax technique (CLWT); subtractive methods with wax blank milling (WBM); and two additive methods, multi jet modeling (MJM), and micro-stereolithography (Micro-SLA). Thirty study models were created using an acrylic model with the maxillary upper right canine, first premolar, and first molar teeth. Based on the scan files from a non-contact blue light scanner (Identica; Medit Co. Ltd., Seoul, Korea), thirty cores were produced using the WBM, MJM, and Micro-SLA methods, respectively, and another thirty frameworks were produced using the CLWT method. To measure the marginal and internal gap, the silicone replica method was adopted, and the silicone images obtained were evaluated using a digital microscope (KH-7700; Hirox, Tokyo, Japan) at 140X magnification. Analyses were performed using two-way analysis of variance (ANOVA) and Tukey post hoc test (α=.05). The mean marginal gaps and internal gaps showed significant differences according to tooth type (Pmanufacturing method (Pmanufacturing methods were within a clinically allowable range, and, thus, the clinical use of additive manufacturing methods is acceptable as an alternative to the traditional lost wax-technique and subtractive manufacturing.

  16. Using a Non-Equivalent Groups Quasi Experimental Design to Reduce Internal Validity Threats to Claims Made by Math and Science K-12 Teacher Recruitment Programs

    Science.gov (United States)

    Moin, Laura

    2009-10-01

    The American Recovery and Reinvestment Act national policy established in 2009 calls for ``meaningful data'' that demonstrate educational improvements, including the recruitment of high-quality teachers. The scant data available and the low credibility of many K-12 math/science teacher recruitment program evaluations remain the major barriers for the identification of effective recruitment strategies. Our study presents a methodology to better evaluate the impact of recruitment programs on increasing participants' interest in teaching careers. The research capitalizes on the use of several control groups and presents a non-equivalent groups quasi-experimental evaluation design that produces program effect claims with higher internal validity than claims generated by current program evaluations. With this method that compares responses to a teaching career interest question from undergraduates all along a continuum from just attending an information session to participating (or not) in the recruitment program, we were able to compare the effect of the program in increasing participants' interest in teaching careers versus the evolution of the same interest but in the absence of the program. We were also able to make suggestions for program improvement and further research. While our findings may not apply to other K-12 math/science teacher recruitment programs, we believe that our evaluation methodology does and will contribute to conduct stronger program evaluations. In so doing, our evaluation procedure may inform recruitment program designers and policy makers.

  17. DC Rocks! Using Place-Based Learning to Introduce Washington DC's K-12 Students to the Geosciences

    Science.gov (United States)

    Mayberry, G. C.; Mattietti, G. K.

    2017-12-01

    The Washington DC area has interesting geology and a multitude of agencies that deal with the geosciences, yet K-12 public school students in DC, most of whom are minorities, have limited exposure to the geosciences. Geoscience agencies in the DC area have a unique opportunity to address this by introducing the geosciences to local students who otherwise may not have such an opportunity, by highlighting the geology in the students' "backyard," and by leveraging partnerships among DC-based geoscience-related agencies. The USGS and George Mason University are developing a project called DC Rocks, which will give DC's students an exciting introduction into the world of geoscience with place-based learning opportunities that will make geoscience relevant to their lives and their futures. Both the need in DC and the potential for lasting impact are great; the geosciences have the lowest racial diversity of all the science, technology, engineering, and math (STEM) fields, 89% of students in DC public schools are minorities, and there is no dedicated geoscience curriculum in DC. DC Rocks aims to give these students early exposure to the earth sciences, and encourage them to consider careers in the profession. DC Rocks will work with partner agencies to apply several methods that are recommended by researchers to increase the participation of minority students in the geosciences, including providing profoundly positive experiences that spark interest in the geosciences (Levine et al., 2007); increasing students' sense of belonging in the geosciences (Huntoon, et al, 2016); and place-based teaching practices that emphasize the study of local sites (Semken, 2005), such as DC's Rock Creek Park. DC Rocks will apply these methods by coordinating local geoscientists and resources to provide real-world examples of the geosciences' impact on students' lives. Through the DC Rocks website, educators will be able to request geoscience-related resources such as class presentations by

  18. Nasa's Operation Icebridge and Remote Sensing Techniques in the K-12 Classroom as a STEM Integration Project

    Science.gov (United States)

    McCarthy, K.

    2017-12-01

    NASA's Operation IceBridge (OIB), the largest airborne survey of Earth's polar ice uses remote sensing methods to collect data on changing sea and land ice. PolarTREC teacher Kelly McCarthy joined the team during the 2016 Spring Arctic Campaign. This presentation explores ways in which k-12 students were engaged in the work being done by OIB through classroom learning experiences, digital communications, and independent research. Initially, digital communication including chats via NASA's Mission Tools Suite for Education (MTSE) platform was leveraged to engage students in the daily work of OIB. Two lessons were piloted with student groups during the 2016-2017 academic year both for students who actively engaged in communications with the team during the expedition and those who had no prior connections to the field. All of the data collected on OIB missions is stored for public use in a digital portal on the National Snow and Ice Data Center (NSIDC) website. In one lesson, 10th-12th grade students were guided through a tutorial to learn how to access data and begin to develop a story about Greenland's Jakobshavn Glacier using pre-selected data sets, Google's MyMaps app, and independent research methods. In the second lesson, 8th grade students were introduced to remote sensing, first through a discussion on vocabulary using productive talk moves and then via a demonstration using Vernier motion detectors and a graph matching simulation. Students worked in groups to develop procedures to map a hidden surface region (boxed assortment of miscellaneous objects) using a Vernier motion sensor to simulate sonar. Students translated data points collected from the motion sensor into a vertical profile of the simulated surface region. Both lessons allowed students a way to engage in two of the most important components of OIB. The ability to work with real data collected by the OIB team provided a unique context through which students gained skill and overcame challenges in

  19. AMS Professional Development Courses: Arming K-12 Teachers with the Tools Needed to Increase Students' Scientific Literacy

    Science.gov (United States)

    Brey, J. A.; Geer, I. W.; Weinbeck, R. S.; Moran, J. M.; Nugnes, K. A.

    2012-12-01

    To better prepare tomorrow's leaders, it is of utmost importance that today's teachers are science literate. To meet that need, the American Meteorological Society (AMS) Education Program offers content-rich, professional development courses and training workshops for precollege teachers in the geosciences. During the fall and spring semesters, the AMS in partnership with NOAA, NASA, and SUNY Brockport, offers a suite of pre-college teacher development courses, DataStreme Atmosphere, DataStreme Ocean and DataStreme Earth's Climate System (ECS). These courses are delivered to small groups of K-12 teachers through Local Implementation Teams (LITs) positioned throughout the U.S. The courses use current, real-world environmental data to investigate the atmosphere, ocean, and climate system and consist of weekly online study materials, weekly mentoring, and several face-to-face meetings, all supplemented by a provided textbook and investigations manual. DataStreme ECS takes an innovative approach to studying climate science, by exploring the fundamental science of Earth's climate system and addressing the societal impacts relevant to today's students and teachers. The course investigates natural and human forcings and feedbacks to examine mitigation and adaptation strategies for the future. Information and data from respected organizations, such as the IPCC, the US Global Change Research Program, NASA, and NOAA are used throughout the course, including in the online and printed investigations. In addition, participants differentiate between climate, climate variability, and climate change through the AMS Conceptual Energy Model, a basic climate model that follows the flow of energy from space to Earth and back. Participants also have access to NASA's EdGCM, a research-grade Global Climate Model where they can explore various future climate scenarios in the same way that actual research scientists do. Throughout all of the courses, teachers have the opportunity to expand

  20. Iodo-gen-catalysed iodination for identification of surface-exposed outer membrane proteins of Escherichia coli K12

    International Nuclear Information System (INIS)

    Ferreira, L.C.S.; Almeida, D.F. de

    1987-01-01

    Surface proteins of Escherichia coli K12 were identified by radiolabelling using 1,3,4,6 - tatrachloro, 3-alpha, 6-alpha - diphenylgycoluryl (Iodo-Gen) and 131 I. Labelled proteins were localized in the outer membrane of the cells. Using this technique it has been possible to observe technique it has been possible to observe that the eletrophoretic pattern of surface proteins changes according to the growth phases in culture. Radiolabelling of E.coli cells inculbated at 42 0 C showed that the syntheses of two surface proteins were temperature-inducible. At least one such protein may be involved in the process of cell division in E.coli K12. (author) [pt

  1. Iodo-gen-catalysed iodination for identification of surface-exposed outer membrane proteins of Escherichia coli K12

    Energy Technology Data Exchange (ETDEWEB)

    Ferreira, L C.S.; Almeida, D.F. de

    1987-12-01

    Surface proteins of Escherichia coli K12 were identified by radiolabelling using 1,3,4,6 - tatrachloro, 3-alpha, 6-alpha - diphenylgycoluryl (Iodo-Gen) and /sup 131/I. Labelled proteins were localized in the outer membrane of the cells. Using this technique it has been possible to observe technique it has been possible to observe that the eletrophoretic pattern of surface proteins changes according to the growth phases in culture. Radiolabelling of E.coli cells inculbated at 42/sup 0/C showed that the syntheses of two surface proteins were temperature-inducible. At least one such protein may be involved in the process of cell division in E.coli K12.

  2. Methylation analysis of histone H4K12ac-associated promoters in sperm of healthy donors and subfertile patients

    Czech Academy of Sciences Publication Activity Database

    Vieweg, M.; Dvořáková-Hortová, Kateřina; Dudková, B.; Waliszewski, P.; Otte, M.; Oels, B.; Hajimohammad, A.; Schorsch, M.; Schuppe, H.M.; Weidner, W.; Steger, K.; Paradowska-Dogan, A.

    2015-01-01

    Roč. 7, č. 31 (2015) ISSN 1868-7083 R&D Projects: GA ČR(CZ) GA14-05547S; GA MŠk(CZ) CZ1.05/1.1.00/02.0109 Institutional support: RVO:86652036 Keywords : H4K12ac in spermatozoa * μChIP * promoter methylation * pyrosequencing * subfertility Subject RIV: EB - Genetics ; Molecular Biology Impact factor: 4.327, year: 2015

  3. "It's worth our time": a model of culturally and linguistically supportive professional development for K-12 STEM educators

    Science.gov (United States)

    Charity Hudley, Anne H.; Mallinson, Christine

    2017-09-01

    Professional development on issues of language and culture is often separate from professional development on issues related to STEM education, resulting in linguistic and cultural gaps in K-12 STEM pedagogy and practice. To address this issue, we have designed a model of professional development in which we work with educators to build cultural and linguistic competence and to disseminate information about how educators view the relevance of language, communication, and culture to STEM teaching and learning. We describe the design and facilitation of our model of culturally and linguistically responsive professional development, grounded in theories of multicultural education and culturally supportive teaching, through professional development workshops to 60 K-12 STEM educators from schools in Maryland and Virginia that serve African American students. Participants noted that culturally and linguistically responsive approaches had yet to permeate their K-12 STEM settings, which they identified as a critical challenge to effectively teaching and engaging African-American students. Based on pre-surveys, workshops were tailored to participants' stated needs for information on literacy (e.g., disciplinary literacies and discipline-specific jargon), cultural conflict and mismatch (e.g., student-teacher miscommunication), and linguistic bias in student assessment (e.g., test design). Educators shared feedback via post-workshop surveys, and a subset of 28 participants completed in-depth interviews and a focus group. Results indicate the need for further implementation of professional development such as ours that address linguistic and cultural issues, tailored for K-12 STEM educators. Although participants in this study enumerated several challenges to meeting this need, they also identified opportunities for collaborative solutions that draw upon teacher expertise and are integrated with curricula across content areas.

  4. An analysis of United States K-12 stem education versus STEM workforce at the dawn of the digital revolution

    Science.gov (United States)

    Cataldo, Franca

    The world is at the dawn of a third industrial revolution, the digital revolution, that brings great changes the world over. Today, computing devices, the Internet, and the World Wide Web are vital technology tools that affect every aspect of everyday life and success. While computing technologies offer enormous benefits, there are equally enormous safety and security risks that have been growing exponentially since they became widely available to the public in 1994. Cybercriminals are increasingly implementing sophisticated and serious hack attacks and breaches upon our nation's government, financial institutions, organizations, communities, and private citizens. There is a great need for computer scientists to carry America's innovation and economic growth forward and for cybersecurity professionals to keep our nation safe from criminal hacking. In this digital age, computer science and cybersecurity are essential foundational ingredients of technological innovation, economic growth, and cybersecurity that span all industries. Yet, America's K-12 education institutions are not teaching the computer science and cybersecurity skills required to produce a technologically-savvy 21st century workforce. Education is the key to preparing students to enter the workforce and, therefore, American K-12 STEM education must be reformed to accommodate the teachings required in the digital age. Keywords: Cybersecurity Education, Cybersecurity Education Initiatives, Computer Science Education, Computer Science Education Initiatives, 21 st Century K-12 STEM Education Reform, 21st Century Digital Literacies, High-Tech Innovative Problem-Solving Skills, 21st Century Digital Workforce, Standardized Testing, Foreign Language and Culture Studies, Utica College, Professor Chris Riddell.

  5. Radiation inactivation of Salmonella panama and Escherichia coli K 12 present on deep-frozen broiler carcasses

    International Nuclear Information System (INIS)

    Mulder, R.W.A.W.

    1976-01-01

    Low doses of ionizing radiation have been used to extend the shelf life of refrigerated poultry carcasses and to reduce the numbers of Salmonellae present. This report gives results of experiments on irradiation of deep-frozen poultry carcasses which were, before freezing, artificially contaminated with Salmonella panama and with a nalidixic acid-resistant Escherichia coli K 12. The D-values (decimal reduction) obtained with the inoculated carcasses were compared with D-values obtained with carcasses which were slaughtered in the normal way. The D-values for S.panama and for E.coli K 12 were 64.9 krad and 55.9 krad in the dripwater. Under commercial conditions approximately 100 krad were required for one decimal reduction of the Enterobacteriaceae present. The D-values estimated on the skin were higher for S.panama than for E.coli K 12 (128.6 krad vs 57.6 krad). If it is assumed that 1 positive carcass in 10,000 is allowed, the deep-frozen carcasses should be irradiated with doses of at least 700 krad to be sure of the absence of the tested S.panama strain. (orig.) [de

  6. BiteScis: Connecting K-12 teachers with science graduate students to produce lesson plans on modern science research

    Science.gov (United States)

    Battersby, Cara

    2016-01-01

    Many students graduate high school having never learned about the process and people behind modern science research. The BiteScis program addresses this gap by providing easily implemented lesson plans that incorporate the whos, whats, and hows of today's scienctific discoveries. We bring together practicing scientists (motivated graduate students from the selective communicating science conference, ComSciCon) with K-12 science teachers to produce, review, and disseminate K-12 lesson plans based on modern science research. These lesson plans vary in topic from environmental science to neurobiology to astrophysics, and involve a range of activities from laboratory exercises to art projects, debates, or group discussion. An integral component of the program is a series of short, "bite-size" articles on modern science research written for K-12 students. The "bite-size" articles and lesson plans will be made freely available online in an easily searchable web interface that includes association with a variety of curriculum standards. This ongoing program is in its first year with about 15 lesson plans produced to date.

  7. Radiation inactivation of Salmonella panama and Escherichia coli K 12 present on deep-frozen broiler carcasses

    Energy Technology Data Exchange (ETDEWEB)

    Mulder, R W.A.W. [Spelderholt Inst. for Poultry Research, Beekbergen (Netherlands). Processing Dept.

    1976-01-01

    Low doses of ionizing radiation have been used to extend the shelf life of refrigerated poultry carcasses and to reduce the numbers of Salmonellae present. This report gives results of experiments on irradiation of deep-frozen poultry carcasses which were, before freezing, artificially contaminated with Salmonella panama and with a nalidixic acid-resistant Escherichia coli K 12. The D-values (decimal reduction) obtained with the inoculated carcasses were compared with D-values obtained with carcasses which were slaughtered in the normal way. The D-values for S.panama and for E.coli K 12 were 64.9 krad and 55.9 krad in the dripwater. Under commercial conditions approximately 100 krad were required for one decimal reduction of the Enterobacteriaceae present. The D-values estimated on the skin were higher for S.panama than for E.coli K 12 (128.6 krad vs 57.6 krad). If it is assumed that 1 positive carcass in 10,000 is allowed, the deep-frozen carcasses should be irradiated with doses of at least 700 krad to be sure of the absence of the tested S.panama strain.

  8. Oral use of Streptococcus salivarius K12 in children with secretory otitis media: preliminary results of a pilot, uncontrolled study

    Directory of Open Access Journals (Sweden)

    Di Pierro F

    2015-09-01

    Full Text Available Francesco Di Pierro,1 Daniele Di Pasquale,2 Maurizio Di Cicco2 1Velleja Research, Milan, Italy; 2ORL Department, Ospedale Maggiore Policlinico Ca’ Grande IRCCS, Milan, Italy Abstract: Secretory otitis media (SOM remains a common disease among children. Although its cause is not yet perfectly established, the pathology, often a sequel of acute otitis media (AOM, is mainly characterized by persistent fluid in the middle ear cavity. Twenty-two children with a diagnosis of SOM were treated daily for 90 days with an oral formulation containing the oral probiotic Streptococcus salivarius K12 (Bactoblis®. After treatment, the children were evaluated for AOM episodes and subjected to tone audiometry, tympanometry, endonasal endoscopy, otoscopy, and tonsillar examination. Subject compliance and probiotic tolerability and side effects have also been evaluated. Our results indicate a good safety profile, a substantial reduction of AOM episodes, and a positive outcome from the treatment for all of the clinical outcomes tested. We conclude that strain K12 may have a role in reducing the occurrence and/or severity of SOM in children. From our perspective, this study constitutes a starting point toward the organization of a more extensive placebo-controlled study aimed at critically appraising our preliminary observations. Keywords: BLIS K12, Bactoblis®, acute otitis media, exudative otitis media

  9. Transport methods: general. 3. An Additive Angular-Dependent Re-balance Acceleration Method for Neutron Transport Equations

    International Nuclear Information System (INIS)

    Cho, Nam Zin; Park, Chang Je

    2001-01-01

    An additive angular-dependent re-balance (AADR) factor acceleration method is described to accelerate the source iteration of discrete ordinates transport calculation. The formulation of the AADR method follows that of the angular-dependent re-balance (ADR) method in that the re-balance factor is defined only on the cell interface and in that the low-order equation is derived by integrating the transport equation (high-order equation) over angular subspaces. But, the re-balance factor is applied additively. While the AADR method is similar to the boundary projection acceleration and the alpha-weighted linear acceleration, it is more general and does have distinct features. The method is easily extendible to DP N and low-order S N re-balancing, and it does not require consistent discretizations between the high- and low-order equations as in diffusion synthetic acceleration. We find by Fourier analysis and numerical results that the AADR method with a chosen form of weighting functions is unconditionally stable and very effective. There also exists an optimal weighting parameter that leads to the smallest spectral radius. The AADR acceleration method described in this paper is simple to implement, unconditionally stable, and very effective. It uses a physically based weighting function with an optimal parameter, leading to the best spectral radius of ρ<0.1865, compared to ρ<0.2247 of DSA. The application of the AADR acceleration method with the LMB scheme on a test problem shows encouraging results

  10. The Capacity Profile: a method to classify additional care needs in children with neurodevelopmental disabilities

    NARCIS (Netherlands)

    Meester-Delver, Anke; Beelen, Anita; Hennekam, Raoul; Nollet, Frans; Hadders-Algra, Mijna

    2007-01-01

    The aim of this study was to determine the interrater reliability and stability over time of the Capacity Profile (CAP). The CAP is a standardized method for classifying additional care needs indicated by current impairments in five domains of body functions: physical health, neuromusculoskeletal

  11. Geometrical shape assessment of additively manufactured features by direct light processing vat polymerization method

    DEFF Research Database (Denmark)

    Péreza, Lucia C. Díaz; Davoudinejad, Ali; Quagliotti, Danilo

    The importance of Additive Manufacturing (AM) in the field of micro manufacturing is increasing. Vat Polymerization Methods are one of the lead AM technologies to produce polymer micro parts. In the Technical University of Denmark (DTU), a vat photopolymerization AM machine able to print features...

  12. Method of treating organic material. [addition of formate, heating under pressure, and distilling the mass

    Energy Technology Data Exchange (ETDEWEB)

    Bergstrom, H O.V.; Cederquist, K N

    1932-02-08

    A method is given of treating organic material such as wood, peat, shale, etc. It is characterized by the addition of formate to the material, before, during, or after heating it under pressure with alkalis, earth alkalis, et cetera, and by the mass thus produced undergoing dry distillation. The patent has three more claims.

  13. Comparison of oxytetracycline degradation behavior in pig manure with different antibiotic addition methods.

    Science.gov (United States)

    Wang, Yan; Chen, Guixiu; Liang, Juanboo; Zou, Yongde; Wen, Xin; Liao, Xindi; Wu, Yinbao

    2015-12-01

    Using manure collected from swine fed with diet containing antibiotics and antibiotic-free swine manure spiked with antibiotics are the two common methods of studying the degradation behavior of veterinary antibiotic in manure in the environment. However, few studies had been conducted to co-compare these two different antibiotic addition methods. This study used oxytetracycline (OTC) as a model antibiotic to study antibiotic degradation behavior in manure under the above two OTC addition methods. In addition, the role of microorganisms present in the manure on degradation behavior was also examined. The results showed that degradation half-life of OTC in manure from swine fed OTC (9.04 days) was significantly shorter than that of the manure directly treated with OTC (9.65 days). Concentration of 4-epi-OTC in manure from swine fed OTC peaked earlier than that in manure spiked with OTC, and the degradation rates of 4-epi-OTC and α-apo-OTC in the manure from swine fed OTC were faster, but the peak concentrations were lower, than those in manure spiked with OTC. Bacterial diversity and relative abundance of Bacillus cereus data demonstrated that sterilization of the manure before experiment significantly decreased OTC degradation rate in both of the addition methods. Results of the present study demonstrated that the presence of the metabolites (especially 4-epi-OTC) and microorganisms had significant influence on OTC degradation.

  14. Strategies for Engaging NASA Earth Scientists in K-12 Education and Public Outreach

    Science.gov (United States)

    Meeson, Blanche W.; Gabrys, Robert E.

    2001-01-01

    Engagement of the Earth Science research community in formal education at the kindergarten through high school level and in various aspects of informal education and in professional development of practitioners in related fields has been and continues to be a challenge. A range of approaches is being used and new ones are constantly being tried. Fundamental to our strategies is an understanding of the priorities, skills, academic experiences, motivation, rewards and work experiences of most scientists. It is within this context that efforts to engage a scientist in education efforts are attempted. A key strategy is to limit our requests to activities where the scientist's contribution of time and expertise can have the most impact. Don't waste the scientist's time! Time is one of their most prized resources, it is extremely valuable to you, and to them, we treat their time like a treasured resource. The clearer a scientist's role, their unique contribution and the finite nature of their effort, the more likely they are to participate. It is critical that commitments made to scientists are kept. If they want and can do more, great! Don't expect or assume more will be forthcoming. Another approach that we use is to create periodic venues that, among other things, serve to identify individuals who have an interest or inclination to con , tribute to education efforts. Once identified we strive to determine their interests so that we can make the best match between their interests and the needs of the education program or efforts. In this way, we try to make the best use of their time while engaging them in efforts which will be personally rewarding, and will further the overall education objectives. In addition, we try to make it easier for scientists to participate by providing focused training, such as development of their interviewing skills, and exposure to key concepts, knowledge and skills which are well known among educators but are not common knowledge among

  15. Effect of Lime Addition Methods on Performance Related Properties of Asphalt Concrete Mixture

    Directory of Open Access Journals (Sweden)

    Amjad Hamd Khalil Albayati

    2016-09-01

    Full Text Available In the recent years, some of the newly constructed asphalt concrete pavements in Baghdad as well as other cities across Iraq showed premature failures with consequential negative impact on both roadway safety and economy. Frequently, load associated mode of failure (rutting and fatigue as well as, occasionally, moisture damage in some poorly drained sections are the main failure types found in those newly constructed road. In this research, hydrated lime was introduced into asphalt concrete mixtures of wearing course in two methods. The first one was the addition of dry lime on dry aggregate and the second one was the addition of dry lime on saturated surface dry aggregate moisturized by 2.0 to 3.0 percent of water. For each type of addition, five different percentages of lime as a partial replacement of ordinary limestone mineral filler were used; these were; 1.0, 1.5, 2.0, 2.5, and 3 percent by weight of aggregate besides a control mixture that did not contain lime. Marshall Mix design method was used and the performance properties of moisture damage, resilient modulus, permanent deformation and fatigue characteristics were evaluated using indirect tensile strength, uniaxial repeated loading and repeated flexural beam tests. Also, VESYS5W software was implemented to evaluate the pavements performance in terms of rut depth and fatigue area for a typical pavement structure. The main conclusion withdrawn from this research revealed that the use of 2.5 percent hydrated lime in dry addition method and wet addition method showed an improved fatigue and permanent deformation characteristics, lower moisture susceptibility and high resilient modulus.

  16. Effect of the chlortetracycline addition method on methane production from the anaerobic digestion of swine wastewater.

    Science.gov (United States)

    Huang, Lu; Wen, Xin; Wang, Yan; Zou, Yongde; Ma, Baohua; Liao, Xindi; Liang, Juanboo; Wu, Yinbao

    2014-10-01

    Effects of antibiotic residues on methane production in anaerobic digestion are commonly studied using the following two antibiotic addition methods: (1) adding manure from animals that consume a diet containing antibiotics, and (2) adding antibiotic-free animal manure spiked with antibiotics. This study used chlortetracycline (CTC) as a model antibiotic to examine the effects of the antibiotic addition method on methane production in anaerobic digestion under two different swine wastewater concentrations (0.55 and 0.22mg CTC/g dry manure). The results showed that CTC degradation rate in which manure was directly added at 0.55mg CTC/g (HSPIKE treatment) was lower than the control values and the rest of the treatment groups. Methane production from the HSPIKE treatment was reduced (pdigesters, and the total nitrogen of the 0.55mg CTC/kg manure collected from mediated swine was significantly higher than the other values. Therefore, different methane production under different antibiotic addition methods might be explained by the microbial activity and the concentrations of antibiotic intermediate products and metabolites. Because the primary entry route of veterinary antibiotics into an anaerobic digester is by contaminated animal manure, the most appropriate method for studying antibiotic residue effects on methane production may be using manure from animals that are given a particular antibiotic, rather than adding the antibiotic directly to the anaerobic digester. Copyright © 2014. Published by Elsevier B.V.

  17. The Diffusion of Computer-Based Technology in K-12 Schools: Teachers' Perspectives

    Science.gov (United States)

    Colandrea, John Louis

    2012-01-01

    Because computer technology represents a major financial outlay for school districts and is an efficient method of preparing and delivering lessons, studying the process of teacher adoption of computer use is beneficial and adds to the current body of knowledge. Because the teacher is the ultimate user of computer technology for lesson preparation…

  18. Diffusing Innovations: Adoption of Serious Educational Games by K-12 Science Teachers

    Science.gov (United States)

    Vallett, David; Annetta, Leonard; Lamb, Richard; Bowling, Brandy

    2014-01-01

    Innovation is a term that has become widely used in education; especially as it pertains to technology infusion. Applying the corporate theory of diffusing innovation to educational practice is an innovation in itself. This mixed-methods study examined 38 teachers in a science educational gaming professional development program that provided…

  19. Digital Game-Based Learning for K-12 Mathematics Education: A Meta-Analysis

    Science.gov (United States)

    Byun, JaeHwan; Joung, Eunmi

    2018-01-01

    Digital games (e.g., video games or computer games) have been reported as an effective educational method that can improve students' motivation and performance in mathematics education. This meta-analysis study (a) investigates the current trend of digital game-based learning (DGBL) by reviewing the research studies on the use of DGBL for…

  20. Generation Y Student-Teachers' Motivational Factors: Retention Implications for K-12 Educational Leaders

    Science.gov (United States)

    Bontempo, Brian

    2010-01-01

    Generation Y represents a growing number of student-teachers who will impact the future of educational practice, yet little research has been conducted for this demographic group. The purpose of this mixed-method study was to identify motivational factors of neophyte teachers and the retention implications these findings had on Kindergarten…

  1. Homophobic Expression in K-12 Public Schools: Legal and Policy Considerations Involving Speech that Denigrates Others

    Science.gov (United States)

    Eckes, Suzanne E.

    2017-01-01

    This article examines an education policy matter that involves homophobic speech in public schools. Using legal research methods, two federal circuit court opinions that have examined the tension surrounding anti-LGBTQ student expression are analyzed. This legal analysis provides non-lawyers some insight into the current realities of student…

  2. The method of manufacture of nylon dental partially removable prosthesis using additive technologies

    Science.gov (United States)

    Kashapov, R. N.; Korobkina, A. I.; Platonov, E. V.; Saleeva, G. T.

    2014-12-01

    The article is devoted to the topic of creating new methods of dental prosthesis. The aim of this work is to investigate the possibility of using additive technology to create nylon prosthesis. As a result of experimental studies, was made a sample of nylon partially removable prosthesis using 3D printing has allowed to simplify, accelerate and reduce the coat of manufacturing high-precision nylon dentures.

  3. The regression-calibration method for fitting generalized linear models with additive measurement error

    OpenAIRE

    James W. Hardin; Henrik Schmeidiche; Raymond J. Carroll

    2003-01-01

    This paper discusses and illustrates the method of regression calibration. This is a straightforward technique for fitting models with additive measurement error. We present this discussion in terms of generalized linear models (GLMs) following the notation defined in Hardin and Carroll (2003). Discussion will include specified measurement error, measurement error estimated by replicate error-prone proxies, and measurement error estimated by instrumental variables. The discussion focuses on s...

  4. Metabolic Engineering of Escherichia coli K12 for Homofermentative Production of L-Lactate from Xylose.

    Science.gov (United States)

    Jiang, Ting; Zhang, Chen; He, Qin; Zheng, Zhaojuan; Ouyang, Jia

    2018-02-01

    The efficient utilization of xylose is regarded as a technical barrier to the commercial production of bulk chemicals from biomass. Due to the desirable mechanical properties of polylactic acid (PLA) depending on the isomeric composition of lactate, biotechnological production of lactate with high optical pure has been increasingly focused in recent years. The main objective of this work was to construct an engineered Escherichia coli for the optically pure L-lactate production from xylose. Six chromosomal deletions (pflB, ldhA, ackA, pta, frdA, adhE) and a chromosomal integration of L-lactate dehydrogenase-encoding gene (ldhL) from Bacillus coagulans was involved in construction of E. coli KSJ316. The recombinant strain could produce L-lactate from xylose resulting in a yield of 0.91 g/g xylose. The chemical purity of L-lactate was 95.52%, and the optical purity was greater than 99%. Moreover, three strategies, including overexpression of L-lactate dehydrogenase, intensification of xylose catabolism, and addition of additives to medium, were designed to enhance the production. The results showed that they could increase the concentration of L-lactate by 32.90, 20.13, and 233.88% relative to the control, respectively. This was the first report that adding formate not only could increase the xylose utilization but also led to the fewer by-product levels.

  5. A survey about prophage induction ability in Escherichia coli K-12(λ by ethnic medicinal plants of Kohgiluyeh va Boyerahmad, Iran

    Directory of Open Access Journals (Sweden)

    M. Hamzeloo-Moghadam

    2014-10-01

    Full Text Available Background and objectives: There is a growing trend towards investigating natural products as sources of compounds with biological effects and many researches have been carried out in order to find effective medications against many diseases. Cancer is no exception and studies focusing on evaluating the effects of different materials on DNA, give valuable information in cancer researches and carcinogenicity studies; thus the present study was focused on evaluating the impact of medicinal plants from  Kohgiluyeh va Boyerahmad province, Iran on DNA. Methods: Thirty five plant species collected have been investigated for prophage induction ability in Escherichia coli K-12(λthroughinductest. Results:The assay demonstrated that 8 plants were able to affect DNA. Conclusion: The results confirm the role of natural resources for biologic effects and what’s more, potential drug candidates in new drug discovery.

  6. Should I Stay or Should I Go? Factors that Influence the Retention, Turnover, and Attrition of K-12 Music Teachers in the United States

    Science.gov (United States)

    Gardner, Robert D.

    2010-01-01

    The purpose of this study was to construct a profile of K-12 music teachers in the United States and develop a model to predict their retention, turnover, and attrition. Responses to the "Schools and Staffing Survey" from 47,857 K-12 public and private school teachers, including 1,903 music teachers, were analyzed using comparative…

  7. Nonthermal inactivation of Escherichia coli K12 in buffered peptone water using a pilot-plant scale supercritical carbon dioxide system with gas-liquid porous metal contractor

    Science.gov (United States)

    This study evaluated the effectiveness of a supercritical carbon dioxide (SCCO2) system, with a gas-liquid CO2 contactor, for reducing Escherichia coli K12 in diluted buffered peptone water. 0.1% (w/v) buffered peptone water inoculated with E. coli K12 was processed using the SCCO2 system at CO2 con...

  8. National Sexuality Education Standards: Core Content and Skills, K-12. A Special Publication of the Journal of School Health. Special Report

    Science.gov (United States)

    American School Health Association (NJ1), 2012

    2012-01-01

    The goal of this paper, "National Sexuality Education Standards: Core Content and Skills, K-12," is to provide clear, consistent and straightforward guidance on the "essential minimum, core content" for sexuality education that is developmentally and age-appropriate for students in grades K-12. The development of these standards is a result of an…

  9. Guided by Principles. Shaping the State of California's Role in K-12 Public School Facility Funding. Full Policy Research Working Paper

    Science.gov (United States)

    Vincent, Jeffrey M.; Gross, Liz S.

    2015-01-01

    K-12 public school facilities need regular investment to ensure student health and safety and support educational programming. Yet, the future of K-12 school facility funding in California is uncertain. A strong state-local partnership has existed that funded new construction, modernization, and other investments in public school facilities across…

  10. Trends in Technology Planning and Funding in Florida K-12 Public Schools

    Directory of Open Access Journals (Sweden)

    ALBERT DIETER RITZHAUPT

    2008-12-01

    Full Text Available This empirical research investigates trends in technology planning and funding in Florida’s K–12 public schools between the 2003–04 and 2005–06 academic years. Survey items that focused on funding and planning issues on Florida’s statewide school technology integration survey were analyzed using logistic models. Results indicate a significant increase in the number of schools revising their technology plans on a regular basis; a significant increase in the frequency with which Florida’s K–12 public schools are seeking funding for technology-related initiatives; a significant increase in parent, administrator, teacher, and student involvement in the technology planning process; and a significant decline in adequate funding for software and hardware needs. In addition, schools with low proportions of economically disadvantaged students sought and were awarded significantly more funds from donations and federal and state grants. Implications for educational leadership and policy are provided.

  11. Growth inhibitor of E. coli K-12 in a sample of 39KCl

    International Nuclear Information System (INIS)

    Luckey, T.D.

    1984-01-01

    Growth rates and total population of E. coli were reduced fourfold when natural KCl (/sup N/KCl) in the medium was replaced by 39 KCl from a particular source. A prolonged lag period was noted in cultures containing either /sup N/KCl or 39 KCl when inoculated with bacteria adapted to 39 KCl. These changes were not due to endogenous radiation because these differences were not observed when (a) the KCl concentrations were reduced from 50 to 5 mM and (b) the 39 KCl from the prime source was replaced with 39 KCl from a second source; also the addition of 40 KCl to 39 KCl did not improve growth. These results suggest that the 39 KCl from the primary source contained an unidentified inhibitor that is not readily detected by physical and chemical analyses. 8 references, 3 figures, 2 tables

  12. Comparison of simple additive weighting (SAW) and composite performance index (CPI) methods in employee remuneration determination

    Science.gov (United States)

    Karlitasari, L.; Suhartini, D.; Benny

    2017-01-01

    The process of determining the employee remuneration for PT Sepatu Mas Idaman currently are still using Microsoft Excel-based spreadsheet where in the spreadsheet there is the value of criterias that must be calculated for every employee. This can give the effect of doubt during the assesment process, therefore resulting in the process to take much longer time. The process of employee remuneration determination is conducted by the assesment team based on some criterias that have been predetermined. The criteria used in the assessment process are namely the ability to work, human relations, job responsibility, discipline, creativity, work, achievement of targets, and absence. To ease the determination of employee remuneration to be more efficient and effective, the Simple Additive Weighting (SAW) method is used. SAW method can help in decision making for a certain case, and the calculation that generates the greatest value will be chosen as the best alternative. Other than SAW, also by using another method was the CPI method which is one of the calculating method in decision making based on performance index. Where SAW method was more faster by 89-93% compared to CPI method. Therefore it is expected that this application can be an evaluation material for the need of training and development for employee performances to be more optimal.

  13. The Ocean Acidification Curriculum Collection - sharing ocean science resources for k-12 classrooms

    Science.gov (United States)

    Williams, P.

    2016-02-01

    The fish and shellfish provided by ecosystems that abound in the waters of Puget Sound have sustained the Suquamish Tribe for millennia. However, years of development, pollution and over-harvest have reduced some fish and shellfish populations to just a fraction of their former abundance. Now, ocean acidification (OA) and climate change pose additional threats to these essential natural resources. Ocean acidification can't be stopped; however, many of the other human-caused stressors to ocean health can. If human behaviors that harm ocean health can be modified to reduce impacts, fish populations and ecosystems could become more resilient to the changing ocean conditions. School is arguably the best place to convey the ideas and awareness needed for people to adopt new behaviors. Students are open to new ideas and they influence their peers and parents. In addition, they are captive audiences in classrooms for many years.The Suquamish Tribe is helping to foster new generations of ocean stewards by creating an online searchable database (OACurriculumCollection.org). This site is designed to facilitate finding, reviewing and sharing free educational materials on OA. At the same time, the Next Generation Science Standards (NGSS) were released providing a great opportunity to get new materials into classrooms. OA provides highly appropriate context to teach many of the ideas in the new standards making it attractive to teachers looking for interesting and relevant materials. In this presentation, we will demonstrate how teachers can use the site as a place to find and share materials on OA. We will also present a framework developed by teachers for understanding OA, its impacts, and the many ways students can help ease the impacts on ocean ecosystems. We will provide examples of how OA can be used as context and content for the NGSS and finally, we will discuss the failures and successes on our journey to get relevant materials into the classroom.

  14. Regulatory role of XynR (YagI) in catabolism of xylonate in Escherichia coli K-12.

    Science.gov (United States)

    Shimada, Tomohiro; Momiyama, Eri; Yamanaka, Yuki; Watanabe, Hiroki; Yamamoto, Kaneyoshi; Ishihama, Akira

    2017-12-01

    The genome of Escherichia coli K-12 contains ten cryptic phages, altogether constituting about 3.6% of the genome in sequence. Among more than 200 predicted genes in these cryptic phages, 14 putative transcription factor (TF) genes exist, but their regulatory functions remain unidentified. As an initial attempt to make a breakthrough for understanding the regulatory roles of cryptic phage-encoded TFs, we tried to identify the regulatory function of CP4-6 cryptic prophage-encoded YagI with unknown function. After SELEX screening, YagI was found to bind mainly at a single site within the spacer of bidirectional transcription units, yagA (encoding another uncharacterized TF) and yagEF (encoding 2-keto-3-deoxy gluconate aldolase, and dehydratase, respectively) within this prophage region. YagEF enzymes are involved in the catabolism of xylose downstream from xylonate. We then designated YagI as XynR (regulator of xylonate catabolism), one of the rare single-target TFs. In agreement with this predicted regulatory function, the activity of XynR was suggested to be controlled by xylonate. Even though low-affinity binding sites of XynR were identified in the E. coli K-12 genome, they all were inside open reading frames, implying that the regulation network of XynR is still fixed within the CR4-6 prophage without significant influence over the host E. coli K-12. © FEMS 2017. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.

  15. The use of Global Positioning System units and ArcGIS Online to engage K-12 Students in Research Being Done in their Local Communities

    Science.gov (United States)

    Butcher, C. E.; Sparrow, E. B.; Clucas, T.

    2015-12-01

    Incorporating K-12 students in scientific research processes and opportunities in their communities is a great way to bridge the gap between research and education and to start building science research capacity at an early age. One goal of the Experimental Program to Stimulate Competitive Research (EPSCoR) Alaska Adapting to Changing Environments project is to engage the local community in the research as well as to share results with the people. By giving K-12 students Global Positioning System (GPS) units, and allowing them to collect and map their own data, they are being exposed to some of the research methods being used by scientists in the Alaska ACE project. This hands-on, minds-on method has been successfully used in formal education settings such as a Junior High School classroom in Nuiqsut, Alaska as well as in informal education settings such as summer camps in Barrow, Alaska and Kenai, Alaska. The students progress from mapping by hand to collecting location data with their GPS units and cameras, and imputing this information into ArcGIS Online to create map products. The data collected were from sites ranging from important places in the community to sites visited during summer camps, with students reflecting on data and site significance. Collecting data, using technology, and creating map products contribute to science skills and practices students need to conduct research of their own and to understand research being done around them. The goal of this education outreach implementation is to bring students closer to the research, understand the process of science, and have the students continue to collect data and contribute to research in their communities. Support provided for this work from the Alaska EPSCoR NSF Award #OIA-1208927 and the state of Alaska is gratefully acknowledged.

  16. The oxygen effect in E.coli K-12 cells of various repair genotypes exposed to neutrons and gamma rays

    International Nuclear Information System (INIS)

    Komova, O.V.; Golovacheva, E.V.

    1988-01-01

    The oxygen enchancement ratio, as estimated after the effect of 137 Cs-γ-quanta, depends on the repair genotype of E. coli K-12 cells and increases in the studied strains in the following order: recA - uvrA - →recA - →wild type→polA - . These variations are levelled with the effect of fast neutrons of divison spectrum (0.75 MeV); the oxygen enhancement ratio for the strains under study decrease, while the oxygen effect is virtually absent in recA - uvrA - -mutant

  17. CALiPER Report 21.1. Linear (T8) Lamps in a 2x4 K12-Lensed Troffer

    Energy Technology Data Exchange (ETDEWEB)

    None

    2014-04-01

    This report focuses on the performance of the same 31 linear LED lamps operated in a typical troffer with a K12 prismatic lens. In general, luminaire efficacy is strongly dictated by lamp efficacy, but the optical system of the luminaire substantially reduces the differences between the luminous intensity distributions of the lamps. While the distributions in the luminaire are similar, the differences remain large enough that workplane illuminance uniformity may be reduced if linear LED lamps with a narrow distribution are used. At the same time, linear LED lamps with a narrower distribution result in slightly higher luminaire efficiency.

  18. H-Point Standard Addition Method for Simultaneous Determination of Eosin and Erytrosine

    Directory of Open Access Journals (Sweden)

    Amandeep Kaur

    2011-01-01

    Full Text Available A new, simple, sensitive and selective H-point standard addition method (HPSAM has been developed for resolving binary mixture of food colorants eosin and erythrosine, which show overlapped spectra. The method is based on the complexation of food dyes eosin and erythrosine with Fe(III complexing reagent at pH 5.5 and solubilizing complexes in triton x-100 micellar media. Absorbances at the two pairs of wavelengths, 540 and 550 nm (when eosin acts as analyte or 518 and 542 nm (when erythrosine act as analyte were monitored. This method has satisfactorily been applied for the determination of eosin and erythrosine dyes in synthetic mixtures and commercial products.

  19. One Step Closer to Mars with Aquaponics: Cultivating Citizen Science in K12 Schools

    Science.gov (United States)

    Kolattukudy, Maria; Puranik, Niyati; Sane, Nishant; Bisht, Kritika; Saffat, Nabeeha; Gupta, Anika; McHugh, Anne; Detweiler, Angela; Bebout, Brad; Everroad, R. Craig

    2017-01-01

    The Microbial Ecology and Biogeochemistry Research Laboratory at NASA Ames Research Center focuses primarily on the nutrient cycling and diversity of complex microbial communities. NASA is interested in the composition and functioning of microbial mat communities as these processes fundamentally shape the form and function of these analogs for the earliest forms of life on Earth (3.6 billion years ago), and likely will on other planets as well. Aquaponics systems are supported by microbial communities who perform many complex ecosystem services, including cycling nitrogen. Microbes are integral to the stability and productivity of aquaponics systems, which are analogous to microbial communities in food production systems that are essential for building efficient life support systems for long-distance space travel. Students at Meadow Park Middle School created 10 parallel aquaponics systems and took temporal microbial samples to characterize whether any macro-ecology variables impacted or changed the microbial diversity of these systems. Students additionally created a website so that other classrooms can pursue similar projects in their own schools (https://go.nasa.gov/2uJhxmF). Our lab at NASA Ames has sequenced water samples from each of the 10 tanks at 3 timepoints using a MinION sequencer. MPMS students will be involved in the analysis of the bioinformatics data generated through this collaboration. Our ongoing collaboration aims to collect and analyze data in the classroom setting that has utility for research scientists, while involving students as collaborators in the research process.

  20. Alignment of Escherichia coli K12 DNA sequences to a genomic restriction map.

    Science.gov (United States)

    Rudd, K E; Miller, W; Ostell, J; Benson, D A

    1990-01-25

    We use the extensive published information describing the genome of Escherichia coli and new restriction map alignment software to align DNA sequence, genetic, and physical maps. Restriction map alignment software is used which considers restriction maps as strings analogous to DNA or protein sequences except that two values, enzyme name and DNA base address, are associated with each position on the string. The resulting alignments reveal a nearly linear relationship between the physical and genetic maps of the E. coli chromosome. Physical map comparisons with the 1976, 1980, and 1983 genetic maps demonstrate a better fit with the more recent maps. The results of these alignments are genomic kilobase coordinates, orientation and rank of the alignment that best fits the genetic data. A statistical measure based on extreme value distribution is applied to the alignments. Additional computer analyses allow us to estimate the accuracy of the published E. coli genomic restriction map, simulate rearrangements of the bacterial chromosome, and search for repetitive DNA. The procedures we used are general enough to be applicable to other genome mapping projects.

  1. Linking the watershed to the schoolshed: teaching sustainable development in K-12 with the Chester RIver Watershed Observatory

    Science.gov (United States)

    Trembanis, A. C.; Levin, D.; Seidel, J.

    2012-12-01

    The Chester River has been the subject of ongoing scientific studies in response to both the Clean Water Act and the EPA's Chesapeake Bay Program initiatives. The Upper, Middle, and Lower Chester are on the Maryland Department of Environment's list of "impaired waters". The Chester River Watershed (CRW) Observatory is lead by the Center for Environment & Society at Washington College. Eight clusters representing 22 public and private K-12 schools in the CRW provide the sampling sites distributed throughout the watershed. Weather stations will be installed at these sites allowing monitoring of the watershed's microclimate. Each cluster will be assigned a Basic Observation Buoy (BOB), an easy to assemble inexpensive buoy platform for real-time water column and atmospheric condition measurements. The BOBs are fitted with a data sonde to collect similar data parameters (e.g. salinity, temperature) as the main stem Chesapeake Bay buoys do. These assets will be deployed and the data transmitted to the Chester River Geographic Information System site for archival and visual display. Curriculum already developed for the Chesapeake Bay Interpretive Buoy System by the NOAA Chesapeake Bay Office will be adapted to the Chester River Watershed. Social issues of water sustainability will be introduced using the Watershed Game (Northland NEMO ®). During 2011 NOAA's Chesapeake Bay Office completed curriculum projects including Chesapeake Exploration, Build-a-Buoy (BaBs) and Basic Observation Buoys (BOBs). These engaging projects utilize authentic data and hands-on activities to demonstrate the tools scientists use to understand system interactions in the Bay. Chesapeake Exploration is a collection of online activities that provides teachers and students with unprecedented access to Bay data. Students are guided through a series of tasks that explore topics related to the interrelation between watersheds, land-use, weather, water quality, and living resources. The BaBs and BOBs

  2. Laser and Electron Beam Additive Manufacturing Methods of Fabricating Titanium Bone Implants

    Directory of Open Access Journals (Sweden)

    Bartłomiej Wysocki

    2017-06-01

    Full Text Available Additive Manufacturing (AM methods are generally used to produce an early sample or near net-shape elements based on three-dimensional geometrical modules. To date, publications on AM of metal implants have mainly focused on knee and hip replacements or bone scaffolds for tissue engineering. The direct fabrication of metallic implants can be achieved by methods, such as Selective Laser Melting (SLM or Electron Beam Melting (EBM. This work compares the SLM and EBM methods used in the fabrication of titanium bone implants by analyzing the microstructure, mechanical properties and cytotoxicity. The SLM process was conducted in an environmental chamber using 0.4–0.6 vol % of oxygen to enhance the mechanical properties of a Ti-6Al-4V alloy. SLM processed material had high anisotropy of mechanical properties and superior UTS (1246–1421 MPa when compared to the EBM (972–976 MPa and the wrought material (933–942 MPa. The microstructure and phase composition depended on the used fabrication method. The AM methods caused the formation of long epitaxial grains of the prior β phase. The equilibrium phases (α + β and non-equilibrium α’ martensite was obtained after EBM and SLM, respectively. Although it was found that the heat transfer that occurs during the layer by layer generation of the component caused aluminum content deviations, neither methods generated any cytotoxic effects. Furthermore, in contrast to SLM, the EBM fabricated material met the ASTMF136 standard for surgical implant applications.

  3. Method for adding additional isotopes to actinide-only burnup credit

    International Nuclear Information System (INIS)

    Lancaster, D.B.; Fuentes, E.; Kang, C.

    1998-01-01

    The Topical Report on Actinide-Only Burnup Credit for Pressurized Water Reactor Spent Nuclear Fuel Packages requires computer code validation to be performed against a benchmark set of chemical assays for isotopic concentration and against a benchmark set of critical experiments for package criticality. Both sets contain all the isotopes included in the methodology. The chemical assays used include the uranium and plutonium isotopes, while the critical experiments were composed of UO 2 or MOX rods, covering the isotopes in the actinide only approach. Since other isotopes are not included in the validation benchmark sets, it would be necessary to justify both the content and worth of any additional isotope for which burnup credit is to be taken (i.e., both the concentration and criticality effect of each particular isotope must be validated). A method is proposed here that can be used for any number of additional isotopes. As does the actinide-only burnup credit methodology, this method makes use of chemical assay data to establish the conservatism in the prediction of each isotope's concentration. Criticality validation is also performed using a benchmark set of UO 2 and MOX critical experiments, where the additional isotopes are validated using worth experiments to conservatively account for any uncertainty in their cross sections. The remaining requirements (analysis and modeling parameters, loading criteria generation, and physical implementation and controls) are performed exactly as described in the actinide-only burnup credit methodology. This report provides insight into each particular requirement in the new methodology

  4. The methods of receiving coal water suspension and its use as the modifying additive in concrete

    Science.gov (United States)

    Buyantuyev, S. L.; Urkhanova, L. A.; Lkhasaranov, S. A.; Stebenkova, Y. Y.; Khmelev, A. B.; Kondratenko, A. S.

    2017-01-01

    Results of research of the coal water suspension (CWS) from a cake received in the electrodigit ways in the fluid environment and gas are given in article and also the possibilities of its use as the modifying additive in concrete are considered. Use of a coal cake is perspective as it is a withdrawal of the coal and concentrating enterprises and has extremely low cost. Methods of receiving CWS and possibility of formation of carbon nanomaterials (CNM) are given in their structure. Research and the analysis of a microstructure of a surface of exemplars before electrodigit processing, their element structure, dependence of durability of a cement stone on a look and quantity of an additive of CWS is conducted. For modification of cement the carbon nanomaterials received from the following exemplars of water coal suspensions were used: foams from a cake from a scrubber of the plasma modular reactor, coal water suspension from a cake from electrodigit installation. The product which can find further application for a power engineering as fuel for combustion, and also in structural materials science, in particular, as the modifying additive in concrete allows to receive these methods.

  5. Prediction of transcriptional regulatory sites in the complete genome sequence of Escherichia coli K-12.

    Science.gov (United States)

    Thieffry, D; Salgado, H; Huerta, A M; Collado-Vides, J

    1998-06-01

    As one of the best-characterized free-living organisms, Escherichia coli and its recently completed genomic sequence offer a special opportunity to exploit systematically the variety of regulatory data available in the literature in order to make a comprehensive set of regulatory predictions in the whole genome. The complete genome sequence of E.coli was analyzed for the binding of transcriptional regulators upstream of coding sequences. The biological information contained in RegulonDB (Huerta, A.M. et al., Nucleic Acids Res.,26,55-60, 1998) for 56 different transcriptional proteins was the support to implement a stringent strategy combining string search and weight matrices. We estimate that our search included representatives of 15-25% of the total number of regulatory binding proteins in E.coli. This search was performed on the set of 4288 putative regulatory regions, each 450 bp long. Within the regions with predicted sites, 89% are regulated by one protein and 81% involve only one site. These numbers are reasonably consistent with the distribution of experimental regulatory sites. Regulatory sites are found in 603 regions corresponding to 16% of operon regions and 10% of intra-operonic regions. Additional evidence gives stronger support to some of these predictions, including the position of the site, biological consistency with the function of the downstream gene, as well as genetic evidence for the regulatory interaction. The predictions described here were incorporated into the map presented in the paper describing the complete E.coli genome (Blattner,F.R. et al., Science, 277, 1453-1461, 1997). The complete set of predictions in GenBank format is available at the url: http://www. cifn.unam.mx/Computational_Biology/E.coli-predictions ecoli-reg@cifn.unam.mx, collado@cifn.unam.mx

  6. Ruminal Methane Production on Simple Phenolic Acids Addition in in Vitro Gas Production Method

    Directory of Open Access Journals (Sweden)

    A. Jayanegara

    2009-04-01

    Full Text Available Methane production from ruminants contributes to total global methane production, which is an important contributor to global warming. In this experiment, six sources of simple phenolic acids (benzoic, cinnamic, phenylacetic, caffeic, p-coumaric and ferulic acids at two different levels (2 and 5 mM added to hay diet were evaluated for their potential to reduce enteric methane production using in vitro Hohenheim gas production method. The measured variables were gas production, methane, organic matter digestibility (OMD, and short chain fatty acids (SCFA. The results showed that addition of cinnamic, caffeic, p-coumaric and ferulic acids at 5 mM significantly (P p-coumaric > ferulic > cinnamic. The addition of simple phenols did not significantly decrease OMD. Addition of simple phenols tends to decrease total SCFA production. It was concluded that methane decrease by addition of phenolic acids was relatively small, and the effect of phenolic acids on methane decrease depended on the source and concentration applied.

  7. Solar Schools Assessment and Implementation Project: Financing Options for Solar Installations on K-12 Schools

    Energy Technology Data Exchange (ETDEWEB)

    Coughlin, J.; Kandt, A.

    2011-10-01

    This report focuses on financial options developed specifically for renewable energy and energy efficiency projects in three California public school districts. Solar energy systems installed on public schools have a number of benefits that include utility bill savings, reductions in greenhouse gas emissions (GHGs) and other toxic air contaminants, job creation, demonstrating environmental leadership, and creating learning opportunities for students. In the 2011 economic environment, the ability to generate general-fund savings as a result of reducing utility bills has become a primary motivator for school districts trying to cut costs. To achieve meaningful savings, the size of the photovoltaic (PV) systems installed (both individually on any one school and collectively across a district) becomes much more important; larger systems are required to have a material impact on savings. Larger PV systems require a significant financial commitment and financing therefore becomes a critical element in the transaction. In simple terms, school districts can use two primary types of ownership models to obtain solar installations and cost savings across a school district. The PV installations can be financed and owned directly by the districts themselves. Alternatively, there are financing structures whereby another entity, such as a solar developer or its investors, actually own and operate the PV systems on behalf of the school district. This is commonly referred to as the 'third-party ownership model.' Both methods have advantages and disadvantages that should be weighed carefully.

  8. Establishing optimal methods of detecting wines counterfeited by addition of alcohol

    International Nuclear Information System (INIS)

    Ranca, Aurora; Menabit, Nelian; Artem, Victoria; Savin, Costica; Vasile, Ancuta; Pasa, Domnica; Postolache, Elena; Iliescu, Maria

    2008-01-01

    The alcohol is one of the most important parameters characterizing the wine and also, most often a means used to commit forgery. The investigations were made with control wines and wines subject to addition of alcohol of 96% and 50% vol concentration. The wines come from the four wine research stations: SCDVV Murfatlar, SCDVV Iasi, SCDVV Bujoru, and SCDVV Blaj. For checking the addition of alcohol the following methods were used: density measuring, establishing the alcohol / unreduced extract, establishing the glycerol / alcohol ratio and determining the ratios of the isotopic mixtures 18 O/ 16 O, 13 C/ 12 C, D/H. Extensive researches, with high precision equipment are planned to continue in order to exclude any possibility of falsification of wines. (authors)

  9. Control of abusive water addition to Octopus vulgaris with non-destructive methods.

    Science.gov (United States)

    Mendes, Rogério; Schimmer, Ove; Vieira, Helena; Pereira, João; Teixeira, Bárbara

    2018-01-01

    Abusive water addition to octopus has evidenced the need for quick non-destructive methods for product qualification in the industry and control of fresh commercial products in markets. Electric conductivity (EC)/pH and dielectric property measurements were selected to detect water uptake in octopus. A significant EC decrease was determined after soaking octopus in freshwater for 4 h. EC reflected the water uptake of octopus and the correspondent concentration decrease of available ions in the interstitial fluid. Significant correlations were determined between octopus water uptake, EC (R = -0.940) and moisture/protein (M/P) ratio (R = 0.923) changes. Seasonal and spatial variation in proximate composition did not introduce any uncertainty in EC discrimination of freshwater tampering. Immersion in 5 g L -1 sodium tripolyphosphate (STPP) increased EC to a value similar to control octopus. EC false negatives resulting from the use of additives (STPP and citric acid) were eliminated with the additional determination of pH. Octopus soaked in freshwater, STPP and citric acid can also be clearly discriminated from untreated samples (control) and also from frozen (thawed) ones using the dielectric properties. No significant differences in the dielectric property scores were found between octopus sizes or geographical locations. Simultaneous EC/pH or dielectric property measurements can be used in a handheld device for non-destructive water addition detection in octopus. M/P ratio can be used as a reference destructive method. © 2017 Society of Chemical Industry. © 2017 Society of Chemical Industry.

  10. Fully implicit two-phase reservoir simulation with the additive schwarz preconditioned inexact newton method

    KAUST Repository

    Liu, Lulu

    2013-01-01

    The fully implicit approach is attractive in reservoir simulation for reasons of numerical stability and the avoidance of splitting errors when solving multiphase flow problems, but a large nonlinear system must be solved at each time step, so efficient and robust numerical methods are required to treat the nonlinearity. The Additive Schwarz Preconditioned Inexact Newton (ASPIN) framework, as an option for the outermost solver, successfully handles strong nonlinearities in computational fluid dynamics, but is barely explored for the highly nonlinear models of complex multiphase flow with capillarity, heterogeneity, and complex geometry. In this paper, the fully implicit ASPIN method is demonstrated for a finite volume discretization based on incompressible two-phase reservoir simulators in the presence of capillary forces and gravity. Numerical experiments show that the number of global nonlinear iterations is not only scalable with respect to the number of processors, but also significantly reduced compared with the standard inexact Newton method with a backtracking technique. Moreover, the ASPIN method, in contrast with the IMPES method, saves overall execution time because of the savings in timestep size.

  11. Lunar and Planetary Science XXXV: Engaging K-12 Educators, Students, and the General Public in Space Science Exploration

    Science.gov (United States)

    2004-01-01

    The session "Engaging K-12 Educators, Students, and the General Public in Space Science Exploration" included the following reports:Training Informal Educators Provides Leverage for Space Science Education and Public Outreach; Teacher Leaders in Research Based Science Education: K-12 Teacher Retention, Renewal, and Involvement in Professional Science; Telling the Tale of Two Deserts: Teacher Training and Utilization of a New Standards-based, Bilingual E/PO Product; Lindstrom M. M. Tobola K. W. Stocco K. Henry M. Allen J. S. McReynolds J. Porter T. T. Veile J. Space Rocks Tell Their Secrets: Space Science Applications of Physics and Chemistry for High School and College Classes -- Update; Utilizing Mars Data in Education: Delivering Standards-based Content by Exposing Educators and Students to Authentic Scientific Opportunities and Curriculum; K. E. Little Elementary School and the Young Astronaut Robotics Program; Integrated Solar System Exploration Education and Public Outreach: Theme, Products and Activities; and Online Access to the NEAR Image Collection: A Resource for Educators and Scientists.

  12. Graphene-Based FET Detector for E. coli K12 Real-Time Monitoring and Its Theoretical Analysis

    Directory of Open Access Journals (Sweden)

    Jieyi Zhu

    2016-01-01

    Full Text Available This paper presents a theoretical analysis for a graphene-based FET real-time detector of the target bacteria E. coli K12. The motivation for this study is to design a sensor device for detection of bacteria in food and water in order to guarantee food safety. Graphene is chosen as our material for sensor design, which has outstanding electrical, physical, and optical performance. In our sensor structure, graphene-based solution gate field effect transistor (FET is the device model; fabrication and functionalization protocol are presented together in this paper. What is more, a real-time signal display system is the accompanied equipment for our designed biosensor device. In this system, the sensor bias current signal Ids would change obviously when the target bacteria are attached to the sensor surface. And the bias current Ids increases when the E. coli concentration increases. In the latter part, a theoretical interpretation of the sensor signal is to explain the bias current Ids increasing after the E. coli K12 attachment.

  13. The absence of the luxS gene increases swimming motility and flagella synthesis in Escherichia coli K12

    Energy Technology Data Exchange (ETDEWEB)

    Ling, Hua; Kang, Aram; Tan, Mui Hua; Qi, Xiaobao [School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637459 (Singapore); Chang, Matthew Wook, E-mail: Matthewchang@ntu.edu.sg [School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637459 (Singapore)

    2010-10-29

    Research highlights: {yields} This paper provides the first evidence that luxS deletion enhances swimming motility and flagella synthesis in Escherichia coli K12 based on motility, transcriptome, and scanning electron microscopy analyses. {yields} A conceptual genetic regulatory network underlying the increased flagella synthesis was constructed based on the transcriptome and network component analyses, and previously known regulatory relations. {yields} The genetic regulatory network suggests that the increased flagella synthesis and motility might be contributed to by increased flhDC transcription level and/or decreased c-di-GMP concentration in luxS-deficient E. coli. -- Abstract: Despite the significant role of S-ribosylhomocysteinase (LuxS) in the activated methyl cycle pathway and quorum sensing, the connectivity between luxS and other cellular functions remains incomplete. Herein, we show that luxS deletion significantly increases swimming motility and flagella synthesis in Escherichia coli K12 using motility, transcriptome, and scanning electron microscopy assays. Further, based on the transcriptome and network component analyses, and known regulatory relations, we propose a conceptual genetic regulatory network underlying the increased flagella synthesis in response to luxS deletion.

  14. The absence of the luxS gene increases swimming motility and flagella synthesis in Escherichia coli K12

    International Nuclear Information System (INIS)

    Ling, Hua; Kang, Aram; Tan, Mui Hua; Qi, Xiaobao; Chang, Matthew Wook

    2010-01-01

    Research highlights: → This paper provides the first evidence that luxS deletion enhances swimming motility and flagella synthesis in Escherichia coli K12 based on motility, transcriptome, and scanning electron microscopy analyses. → A conceptual genetic regulatory network underlying the increased flagella synthesis was constructed based on the transcriptome and network component analyses, and previously known regulatory relations. → The genetic regulatory network suggests that the increased flagella synthesis and motility might be contributed to by increased flhDC transcription level and/or decreased c-di-GMP concentration in luxS-deficient E. coli. -- Abstract: Despite the significant role of S-ribosylhomocysteinase (LuxS) in the activated methyl cycle pathway and quorum sensing, the connectivity between luxS and other cellular functions remains incomplete. Herein, we show that luxS deletion significantly increases swimming motility and flagella synthesis in Escherichia coli K12 using motility, transcriptome, and scanning electron microscopy assays. Further, based on the transcriptome and network component analyses, and known regulatory relations, we propose a conceptual genetic regulatory network underlying the increased flagella synthesis in response to luxS deletion.

  15. First Steps Toward K-12 Teacher Professional Development Using Internet-based Telescopes

    Science.gov (United States)

    Berryhill, K. J.; Gershun, D.; Slater, T. F.; Armstrong, J. D.

    2012-12-01

    How can science teachers become more familiar with emerging technology, excite their students and give students a taste of astronomy research? Astronomy teachers do not always have research experience, so it is difficult for them to convey to students how researchers use telescopes. The nature of astronomical observation (e.g., remote sites, expensive equipment, and odd hours) has been a barrier to providing teachers with insight into the process. Robotic telescopes (operated automatically with queued observing schedules) and remotely controlled telescopes (controlled by the user via the Internet) allow scientists to conduct observing sessions on research-grade telescopes half a world away. The same technology can now be harnessed by STEM educators to engage students and reinforce what is being taught in the classroom, as seen in some early research in elementary schools (McKinnon and Mainwaring 2000 and McKinnon and Geissinger 2002), and middle/high schools (Sadler et al. 2001, 2007 and Gehret et al. 2005). However, teachers need to be trained to use these resources. Responding to this need, graduate students and faculty at the University of Wyoming and CAPER Center for Astronomy & Physics Education Research are developing teacher professional development programs using Internet-based telescopes. We conducted an online course in the science education graduate program at the University of Wyoming. This course was designed to sample different types of Internet-based telescopes to evaluate them as resources for teacher professional development. The 10 participants were surveyed at the end of the course to assess their experiences with each activity. In addition, pre-test/post-test data were collected focusing specifically on one of the telescopes (Gershun, Berryhill and Slater 2012). Throughout the course, the participants learned to use a variety of robotic and remote telescopes including SLOOH Space Camera (www.slooh.com), Sky Titan Observatory (www

  16. Geothermal Heat Pumps in K-12 Schools -- A Case Study of the Lincoln, Nebraska, Schools

    Energy Technology Data Exchange (ETDEWEB)

    Shonder, J.A.

    2000-05-02

    schools built in the district that are served by GHPs. ORNL was provided with complete as-built construction plans for the schools and associated equipment, access to original design calculations and cost estimates, extensive equipment operating data [both from the buildings' energy management systems (EMSs) and from utility meters], and access to the school district's complete maintenance record database, not only for the four GHP schools, but for the other schools in the district using conventional space conditioning equipment. Using this information, we were able to reproduce the process used by the Lincoln school district and the consulting engineering firm to select GHPs over other options to provide space conditioning for the four schools. The objective was to determine whether this decision was the correct one, or whether some other technology would have been more cost-effective. An additional objective was to identify all of the factors that make it difficult for building owners and their engineers to consider GHPs in their projects so that ongoing programs can remove these impediments over time.

  17. Increasing participation in the Earth sciences through engagement of K-12 educators in Earth system science analysis, inquiry and problem- based learning and teaching

    Science.gov (United States)

    Burrell, S.

    2012-12-01

    Given low course enrollment in geoscience courses, retention in undergraduate geoscience courses, and granting of BA and advanced degrees in the Earth sciences an effective strategy to increase participation in this field is necessary. In response, as K-12 education is a conduit to college education and the future workforce, Earth science education at the K-12 level was targeted with the development of teacher professional development around Earth system science, inquiry and problem-based learning. An NSF, NOAA and NASA funded effort through the Institute for Global Environmental Strategies led to the development of the Earth System Science Educational Alliance (ESSEA) and dissemination of interdisciplinary Earth science content modules accessible to the public and educators. These modules formed the basis for two teacher workshops, two graduate level courses for in-service teachers and two university course for undergraduate teacher candidates. Data from all three models will be presented with emphasis on the teacher workshop. Essential components of the workshop model include: teaching and modeling Earth system science analysis; teacher development of interdisciplinary, problem-based academic units for implementation in the classroom; teacher collaboration; daily workshop evaluations; classroom observations; follow-up collaborative meetings/think tanks; and the building of an on-line professional community for continued communication and exchange of best practices. Preliminary data indicate increased understanding of Earth system science, proficiency with Earth system science analysis, and renewed interest in innovative delivery of content amongst teachers. Teacher-participants reported increased student engagement in learning with the implementation of problem-based investigations in Earth science and Earth system science thinking in the classroom, however, increased enthusiasm of the teacher acted as a contributing factor. Teacher feedback on open

  18. Evaluation method of radiation stability of hardened cement paste with chemical additives

    Energy Technology Data Exchange (ETDEWEB)

    Medvedev, Vyacheslav; Pustovgar, Andrey [National Research Univ. ' Moscow State Univ. of Civil Engineering' (MSUCE), Moscow (Russian Federation); National Research Univ. ' Moscow State Univ. of Civil Engineering' (MSUCE), Moscow (Russian Federation). Scientific Research Inst. of Constructional Materials and Technologies; Denisov, Alexander; Soloviev, Vitaly [National Research Univ. ' Moscow State Univ. of Civil Engineering' (MSUCE), Moscow (Russian Federation)

    2013-07-01

    The influence of additives on the radiation resistance of the concrete will occur through the influence of radiation changes of hardened cement paste on radiation changes of concrete and can be quite significant. The test sequence was produced according to the modified method. The samples were prepared in the form of prisms with the following dimensions: 10 mm x 10 mm, 30 mm long. Measurement series were produced after each heating and cooling sequence. Then the difference between the values before and after heating was calculated. (orig.)

  19. Reducing the ordering temperature of FePt nanoparticles by Cu additive and alternate reduction method

    Directory of Open Access Journals (Sweden)

    Fang Wang

    2017-12-01

    Full Text Available (FePt85Cu15 nanoparticles were successfully prepared by alternate reduction of metal salts in aqueous medium. Detailed investigations on the correlation between the magnetic and structural properties of these nanoparticles are presented as a function of annealing temperature. Both the X-ray diffraction patterns and the magnetic hysteresis loop measurements show the existence of L10-FePt phase at a relative low annealing temperature. It is proved that the Cu additive and alternate reduction are very effective methods in reducing the ordering temperature of FePt nanoparticles.

  20. Climate Discovery: Integrating Research With Exhibit, Public Tours, K-12, and Web-based EPO Resources

    Science.gov (United States)

    Foster, S. Q.; Carbone, L.; Gardiner, L.; Johnson, R.; Russell, R.; Advisory Committee, S.; Ammann, C.; Lu, G.; Richmond, A.; Maute, A.; Haller, D.; Conery, C.; Bintner, G.

    2005-12-01

    The Climate Discovery Exhibit at the National Center for Atmospheric Research (NCAR) Mesa Lab provides an exciting conceptual outline for the integration of several EPO activities with other well-established NCAR educational resources and programs. The exhibit is organized into four topic areas intended to build understanding among NCAR's 80,000 annual visitors, including 10,000 school children, about Earth system processes and scientific methods contributing to a growing body of knowledge about climate and global change. These topics include: 'Sun-Earth Connections,' 'Climate Now,' 'Climate Past,' and 'Climate Future.' Exhibit text, graphics, film and electronic media, and interactives are developed and updated through collaborations between NCAR's climate research scientists and staff in the Office of Education and Outreach (EO) at the University Corporation for Atmospheric Research (UCAR). With funding from NCAR, paleoclimatologists have contributed data and ideas for a new exhibit Teachers' Guide unit about 'Climate Past.' This collection of middle-school level, standards-aligned lessons are intended to help students gain understanding about how scientists use proxy data and direct observations to describe past climates. Two NASA EPO's have funded the development of 'Sun-Earth Connection' lessons, visual media, and tips for scientists and teachers. Integrated with related content and activities from the NASA-funded Windows to the Universe web site, these products have been adapted to form a second unit in the Climate Discovery Teachers' Guide about the Sun's influence on Earth's climate. Other lesson plans, previously developed by on-going efforts of EO staff and NSF's previously-funded Project Learn program are providing content for a third Teachers' Guide unit on 'Climate Now' - the dynamic atmospheric and geological processes that regulate Earth's climate. EO has plans to collaborate with NCAR climatologists and computer modelers in the next year to develop

  1. A phenomenological case study concerning science teacher educators' beliefs and teaching practices about culturally relevant pedagogy and preparing K-12 science teachers to engage African American students in K-12 science

    Science.gov (United States)

    Underwood, Janice Bell

    Due to the rising diversity in today's schools, science teacher educators (STEs) suggest that K-12 teachers must be uniquely prepared to engage these students in science classrooms. Yet, in light of the increasing white-black science achievement gap, it is unclear how STEs prepare preservice teachers to engage diverse students, and African Americans in particular. Therefore, the purpose of this study was to find out how STEs prepare preservice teachers to engage African American students in K-12 science. Thus, using the culturally relevant pedagogy (CRP) framework, this phenomenological case study explored beliefs about culturally relevant science teaching and the influence of reported beliefs and experiences related to race on STEs' teaching practices. In the first phase, STE's in a mid-Atlantic state were invited to participate in an electronic survey. In the second phase, four participants, who were identified as exemplars, were selected from the survey to participate in three semi-structured interviews. The data revealed that STEs were more familiar with culturally responsive pedagogy (CResP) in the context of their post-secondary classrooms as opposed to CRP. Further, most of the participants in part one and two described modeling conventional ways they prepare their preservice teachers to engage K-12 students, who represent all types of diversity, without singling out any specific race. Lastly, many of the STEs' in this study reported formative experiences related to race and beliefs in various manifestations of racism have impacted their teaching beliefs and practices. The findings of this study suggest STEs do not have a genuine understanding of the differences between CRP and CResP and by in large embrace CResP principles. Secondly, in regards to preparing preservice teachers to engage African American students in science, the participants in this study seemed to articulate the need for ideological change, but were unable to demonstrate pedagogical changes

  2. Performance of the Tariff Method: validation of a simple additive algorithm for analysis of verbal autopsies

    Directory of Open Access Journals (Sweden)

    Murray Christopher JL

    2011-08-01

    Full Text Available Abstract Background Verbal autopsies provide valuable information for studying mortality patterns in populations that lack reliable vital registration data. Methods for transforming verbal autopsy results into meaningful information for health workers and policymakers, however, are often costly or complicated to use. We present a simple additive algorithm, the Tariff Method (termed Tariff, which can be used for assigning individual cause of death and for determining cause-specific mortality fractions (CSMFs from verbal autopsy data. Methods Tariff calculates a score, or "tariff," for each cause, for each sign/symptom, across a pool of validated verbal autopsy data. The tariffs are summed for a given response pattern in a verbal autopsy, and this sum (score provides the basis for predicting the cause of death in a dataset. We implemented this algorithm and evaluated the method's predictive ability, both in terms of chance-corrected concordance at the individual cause assignment level and in terms of CSMF accuracy at the population level. The analysis was conducted separately for adult, child, and neonatal verbal autopsies across 500 pairs of train-test validation verbal autopsy data. Results Tariff is capable of outperforming physician-certified verbal autopsy in most cases. In terms of chance-corrected concordance, the method achieves 44.5% in adults, 39% in children, and 23.9% in neonates. CSMF accuracy was 0.745 in adults, 0.709 in children, and 0.679 in neonates. Conclusions Verbal autopsies can be an efficient means of obtaining cause of death data, and Tariff provides an intuitive, reliable method for generating individual cause assignment and CSMFs. The method is transparent and flexible and can be readily implemented by users without training in statistics or computer science.

  3. The Arctic Climate Modeling Program: K-12 Geoscience Professional Development for Rural Educators

    Science.gov (United States)

    Bertram, K. B.

    2009-12-01

    other 21st century learning skills. Climate studies offer insight into a broad cross-section of STM careers, and provide a natural forum for helping students develop problem-solving skills inherent in STM research. Climate research involves sophisticated technology, a complex set of 21st century skills, and the ability to collaborate with an international community. Professional development that trains teachers in these skills is essential considering that recent research shows 90 percent of U.S. secondary students are taught Earth and physical science by a teacher lacking STM certification. ACMP summative evaluation posed three questions: 1) Did ACMP training meet teachers’ needs? 2) Did ACMP involvement result in more effective teachers and teaching? 3) Did participation in ACMP result in higher Bering Strait School District student achievement? Teachers and students were evaluated using a mixed method design incorporating descriptive components with a before/after design to measure what teachers and students learned. Community members, 165 teachers, and 1,738 individual students participated in the program, which was successful in its goals overall.

  4. Evaporation model for beam based additive manufacturing using free surface lattice Boltzmann methods

    International Nuclear Information System (INIS)

    Klassen, Alexander; Scharowsky, Thorsten; Körner, Carolin

    2014-01-01

    Evaporation plays an important role in many technical applications including beam-based additive manufacturing processes, such as selective electron beam or selective laser melting (SEBM/SLM). In this paper, we describe an evaporation model which we employ within the framework of a two-dimensional free surface lattice Boltzmann method. With this method, we solve the hydrodynamics as well as thermodynamics of the molten material taking into account the mass and energy losses due to evaporation and the recoil pressure acting on the melt pool. Validation of the numerical model is performed by measuring maximum melt depths and evaporative losses in samples of pure titanium and Ti–6Al–4V molten by an electron beam. Finally, the model is applied to create processing maps for an SEBM process. The results predict that the penetration depth of the electron beam, which is a function of the acceleration voltage, has a significant influence on evaporation effects. (paper)

  5. Deposition of additives onto surface of carbon materials by blending method--general conception

    International Nuclear Information System (INIS)

    Przepiorski, Jacek

    2005-01-01

    Carbon fibers loaded with potassium carbonate and with metallic copper were prepared by applying a blending method. Raw isotropic coal pitch was blended with KOH or CuBr 2 and obtained mixtures were subjected to spinning. In this way KOH and copper salt-blended fiber with uniform distribution of potassium and copper were spun. The raw fibers were exposed to stabilization with a mixture of CO 2 and air or air only through heating to 330 deg. C and next to treatment with carbon dioxide or hydrogen at higher temperatures. Electron probe micro-analysis (EPMA) analyses showed presence of potassium carbonate or metallic copper predominantly in peripheral regions of the obtained fibers. Basing on the mechanisms of potassium and copper diffusion over the carbon volume, generalized method for the deposition of additives onto surface of carbon materials is proposed

  6. Final report on EURAMET.QM-K12: EURAMET key comparison on the determination of the mass fraction of creatinine in serum

    Science.gov (United States)

    Bell, David; Hopley, Chris; Ellison, Stephen L. R.; O'Connor, Gavin

    2013-01-01

    Creatinine is a well-known marker for the evaluation of kidney function. Its routine measurement is undertaken by many clinical laboratories and comparable results over distance and time are required for effective diagnosis. To address this need many National Measurement Institutes (or designated institutes) provide services in this area via the provision of higher order standards or reference measurements. The organic analysis working group of the consultative committee for amount of substance have conducted two previous key comparisons to assess the equivalence of institutes who provide such services. The purpose of this study was to enable institutes who missed the previous studies to demonstrate their capability for characterizing serum materials containing 1 µg/g to 100 µg/g of creatinine. The study material consisted of two lyophilized serum samples which were used in an external quality control proficiency testing scheme. No target values were available for these materials and all participants reported results within the one month timeframe given for analysis. Five institutes participated in the key study and a single institute submitted results for the parallel pilot study. All participants in the key study used isotope dilution with either gas or liquid chromatography coupled with mass spectrometry. The pilot study laboratory used a novel isotope dilution surface-enhanced Raman spectroscopy method. The comparison reference value for each material was set as the mean of all results submitted by those participating in the key study. The choice of the reference value estimator was constrained as it was deemed more appropriate to treat the data in a similar manner to CCQM-K12 if the relative degrees of equivalence were to be compared. This resulted in reference values of (54.27 ± 0.72) µg/g and (38.01 ± 0.42) µg/g for the two separate materials. The relative degrees of equivalence were calculated and these were compared with the relative degrees of

  7. H-point standard additions method for simultaneous determination of sulfamethoxazole and trimethoprim in pharmaceutical formulations and biological fluids with simultaneous addition of two analytes

    Science.gov (United States)

    Givianrad, M. H.; Saber-Tehrani, M.; Aberoomand-Azar, P.; Mohagheghian, M.

    2011-03-01

    The applicability of H-point standard additions method (HPSAM) to the resolving of overlapping spectra corresponding to the sulfamethoxazole and trimethoprim is verified by UV-vis spectrophotometry. The results show that the H-point standard additions method with simultaneous addition of both analytes is suitable for the simultaneous determination of sulfamethoxazole and trimethoprim in aqueous media. The results of applying the H-point standard additions method showed that the two drugs could be determined simultaneously with the concentration ratios of sulfamethoxazole to trimethoprim varying from 1:18 to 16:1 in the mixed samples. Also, the limits of detections were 0.58 and 0.37 μmol L -1 for sulfamethoxazole and trimethoprim, respectively. In addition the means of the calculated RSD (%) were 1.63 and 2.01 for SMX and TMP, respectively in synthetic mixtures. The proposed method has been successfully applied to the simultaneous determination of sulfamethoxazole and trimethoprim in some synthetic, pharmaceutical formulation and biological fluid samples.

  8. Determination of free acid by standard addition method in potassium thiocyanate

    International Nuclear Information System (INIS)

    Baumann, E.W.

    1982-06-01

    The free acid content of solutions containing hydrolyzable ions has been determined potentiometrically by a standard addition method. Two increments of acid are added to the sample in 1M potassium thiocyanate solution. The sample concentration is calculated by solution of three simultaneous Nernst equations. The method has been demonstrated for solutions containing Al 3+ , Cr 3+ , Fe 3+ , Hg 2+ , Ni 2+ , Th 4+ , or UO 2 2+ with a metal-to-acid ratio of < 2.5. The method is suitable for determination of 10 μmoles acid in 10 mL total volume. The accuracy can be judged from the agreement of the Nernst slopes found in the presence and absence of hydrolyzable ions. The relative standard deviation is < 2.5%. The report includes a survey of experiments with thermometric, pH, and Gran plot titrations in a variety of complexants, from which the method was evolved. Also included is a literature survey of sixty references, a discussion of the basic measurements, and a complete analytical procedure

  9. Generalized concentration addition: a method for examining mixtures containing partial agonists.

    Science.gov (United States)

    Howard, Gregory J; Webster, Thomas F

    2009-08-07

    Environmentally relevant toxic exposures often consist of simultaneous exposure to multiple agents. Methods to predict the expected outcome of such combinations are critical both to risk assessment and to an accurate judgment of whether combinations are synergistic or antagonistic. Concentration addition (CA) has commonly been used to assess the presence of synergy or antagonism in combinations of similarly acting chemicals, and to predict effects of combinations of such agents. CA has the advantage of clear graphical interpretation: Curves of constant joint effect (isoboles) must be negatively sloped straight lines if the mixture is concentration additive. However, CA cannot be directly used to assess combinations that include partial agonists, although such agents are of considerable interest. Here, we propose a natural extension of CA to a functional form that may be applied to mixtures including full agonists and partial agonists. This extended definition, for which we suggest the term "generalized concentration addition," encompasses linear isoboles with slopes of any sign. We apply this approach to the simple example of agents with dose-response relationships described by Hill functions with slope parameter n=1. The resulting isoboles are in all cases linear, with negative, zero and positive slopes. Using simple mechanistic models of ligand-receptor systems, we show that the same isobole pattern and joint effects are generated by modeled combinations of full and partial agonists. Special cases include combinations of two full agonists and a full agonist plus a competitive antagonist.

  10. Method for mapping population-based case-control studies: an application using generalized additive models

    Directory of Open Access Journals (Sweden)

    Aschengrau Ann

    2006-06-01

    Full Text Available Abstract Background Mapping spatial distributions of disease occurrence and risk can serve as a useful tool for identifying exposures of public health concern. Disease registry data are often mapped by town or county of diagnosis and contain limited data on covariates. These maps often possess poor spatial resolution, the potential for spatial confounding, and the inability to consider latency. Population-based case-control studies can provide detailed information on residential history and covariates. Results Generalized additive models (GAMs provide a useful framework for mapping point-based epidemiologic data. Smoothing on location while controlling for covariates produces adjusted maps. We generate maps of odds ratios using the entire study area as a reference. We smooth using a locally weighted regression smoother (loess, a method that combines the advantages of nearest neighbor and kernel methods. We choose an optimal degree of smoothing by minimizing Akaike's Information Criterion. We use a deviance-based test to assess the overall importance of location in the model and pointwise permutation tests to locate regions of significantly increased or decreased risk. The method is illustrated with synthetic data and data from a population-based case-control study, using S-Plus and ArcView software. Conclusion Our goal is to develop practical methods for mapping population-based case-control and cohort studies. The method described here performs well for our synthetic data, reproducing important features of the data and adequately controlling the covariate. When applied to the population-based case-control data set, the method suggests spatial confounding and identifies statistically significant areas of increased and decreased odds ratios.

  11. Determination of free acid by standard addition method in potassium thiocyanate

    International Nuclear Information System (INIS)

    1981-01-01

    An analytical method for determination of free acidity in all SRP process solutions has been developed. Free acidity was successfully determined in solutions of nitric acid and the nitrates of aluminum, chromium(III), iron(III), mercury(II), nickel(II), thorium, and uranium(VI), at metal-to-acid ratios <2.5. Sample requirements, instrumentation, and mode of operation are similar to those currently used in the Laboratories Department free acid procedures. The simple procedure would be suitable for automation and microprocessor control. The method consists of two additions of known increments of acid into a solution containing the sample aliquot (10 μmoles free acid) and 10 mL 1M potassium thiocyanate. The potential is determined in the initial solution and after each addition with a glass electrode and pH meter. The sample concentration is calculated by solution of three simultaneous Nernst equations. Two programs for this iterative computation are available: one written for the PDP-15 computer and another for a Hewlett-Packard 67 (or 97) programmable calculator. The accuracy of the result is verified by a slope that approximates the theoretical Nernst value. The relative standard deviation is <2.5%. This memorandum includes a survey of experiments with thermometric, pH, and Gran plot titrations in a variety of complexants, from which this particular system and technique logically evolved. The appendix includes a literature survey of sixty references, a discussion of the basic measurements, and a complete analytical procedure. The final step for completion of this RTA is training and consultation at the convenience of the Laboratories Department for demonstration of the method with process samples

  12. Digital Media for STEM Learning: Developing scientific practice skills in the K-12 STEM classroom with resources from WGBH and PBS LearningMedia

    Science.gov (United States)

    Foster, J.; Connolly, R.

    2017-12-01

    WGBH's "Bringing the Universe to America's Classrooms" project is a 5-year effort to design, produce and evaluate digital media tools and resources that support scientific practice skills in diverse K-12 learners. Resources leverage data and content from NASA and WGBH signature programs, like NOVA, into sound instructional experiences that provide K-12 STEM teachers with free, quality resources for teaching topics in the Earth and Space Sciences. Resources address the content and practices in the new K-12 Framework for Science Education and are aligned with the NGSS. Participants will learn about design strategies, findings from our evaluation efforts, and how to access free resources on PBS LearningMedia.

  13. How should we teach diverse students? Cross-cultural comparison of diversity issues in K-12 schools in Japan and the US

    Directory of Open Access Journals (Sweden)

    Fuyu Shimomura

    2016-02-01

    Full Text Available Increasing student diversity in K-12 schools has gained attention in Japan and the US. In the US, racial diversity has historically shaped inequity in educational access and teacher quality. In Japan, regardless of its reputation for cultural homogeneity among its residents, issues surrounding student diversity have gained attention because of the increasing number of returnees—Japanese students raised overseas because of their parents’ expatriation. This paper compares and contrasts the diversity issues in K-12 school settings in both countries, and explores potential approaches to improve the accommodation of diversity in K-12 schools.

  14. The Role of Noble Metal Addition Methods on BWR Shut Down Dose Rates

    International Nuclear Information System (INIS)

    Cowan, Robert L.; Garcia Susan, E.

    2012-09-01

    Noble metal addition technology was developed for the BWR as a means of establishing low electrochemical corrosion potentials (ECP) on structural materials to mitigate intergranular stress corrosion cracking (IGSCC). When the reactor water molar ratio of H 2 / (O 2 +H 2 O 2 ) is > 2 on noble metal treated surfaces, the resulting ECP is near -500 mV (SHE), well into the mitigation range. This ratio can be achieved in most areas of the reactor with feedwater hydrogen additions in the range of 0.2 mg/kg, a condition that does not increase the radiation level in the main steam, a side effect of conventional hydrogen water chemistry (HWC). The resulting low ECP on the surface of stainless steel piping and components results in a change in form of the stable corrosion film to a spinel structure. Since it is the 60 Co incorporated into the corrosion film that is the primary source term of shutdown dose rates in BWRs, the structure and composition of the film can have a large influence in the resulting dose rates. The results of the first generation of noble metal technology, noble metal chemical addition (NMCA), showed that the reactor water ratio of 60 Co (s)/Zn (s) was a key parameter in determining shut down dose rate values. This paper will review that history and provide mechanistic understanding of how initial post NMCA dose rates are established and change with time. On-line noble metal chemical addition (OLNC) is the second generation of noble metal technology. The method utilizes the on-line injection of dilute Na 2 Pt (OH) 6 into the feedwater over a period of approximately 10 days. The first application of OLNC occurred at a European reactor in July of 2005 and to date over 20 BWRs have applied the technology, with many more applications scheduled. It is expected that OLNC will become the de facto standard because it eliminates 60 hours of outage application time and it addresses the crack flanking concerns that can arise under certain conditions. Because both

  15. IMPLEMENTATION OF SIMPLE ADDITIVE WEIGHTING (SAW METHODE IN DETERMINING HIGH SCHOOL STUDENT’S INTEREST

    Directory of Open Access Journals (Sweden)

    Prind Triajeng Pungkasanti

    2017-09-01

    Full Text Available The Ministry of Research, Technology, and Higher Education of Republic of Indonesia has set a regulation about curriculum applied in education field named Kurikulum 2013. One of the subsections in the Kurikulum 2013 regulates all requirements of majoring in high school. High school students determine their major based on Kurrikulum 2013 as they are on the 10th grade. The purpose of the majoring in education is to allow children development based on their skills and interests, because before, majoring have been done based on scores obtained. The main problem is the majoring requirements considered are admission test score and Junior High School National Test score. Both scores are not sufficient enough to determine the students major therefore academic aptitude test score is required. In term of weighting, the school has not been imposed the weighting system so the scores obtained is the average of admission test score and national test score. Based on the issue above, a solution required to solve the issue using a method. Method used in this research is Simple Additive Weighting (SAW, wherein this methode is looking for the weighted sum of performance rate on every alternative of atributes. This research provides the information about which potential students is suitable to enter the science major and social major so this results can be used as consideration of school decisions.

  16. Application of revised procedure on determining large excess reactivity of operating reactor. Fuel addition method

    International Nuclear Information System (INIS)

    Nagao, Yoshiharu

    2002-01-01

    The fuel addition method or the neutron absorption substitution method have been used for determination of large excess multiplication factor of large sized reactors. It has been pointed out, however, that all the experimental methods are possibly not free from the substantially large systematic error up to 20%, when the value of the excess multiplication factor exceeds about 15%Δk. Then, a basic idea of a revised procedure was proposed to cope with the problem, which converts the increase of multiplication factor in an actual core to that in a virtual core by calculation, because its value is in principle defined not for the former but the latter core. This paper proves that the revised procedure is able to be applicable for large sized research and test reactors through the theoretical analyses on the measurements undertaken at the JMTRC and JMTR cores. The values of excess multiplication factor are accurately determined utilizing the whole core calculation by the Monte Carlo code MCNP4A. (author)

  17. Fuzzy Simple Additive Weighting Method in the Decision Making of Human Resource Recruitment

    Directory of Open Access Journals (Sweden)

    Budi Prasetiyo

    2016-12-01

    Full Text Available The Company is one of the jobs that was founded to reduce unemployment. The progress of a company is determined by the human resources that exist within the company. So, the selection of workers will join the company need to be selected first. The hardest thing in making a selection factor is the effort to eliminate the subjectivity of the personnel manager so that every choice made is objective based on the criteria expected by the company. To help determine who is accepted as an employee in the company, we need a method that can provide a valid decision. Therefore, we use Fuzzy Multiple Attribute Decision Making with Simple Additive Weighting method (SAW to decide to make in human resource recruitment. This method was chosen because it can provide the best alternative from several alternatives. In this case, the alternative is that the applicants or candidates. This research was conducted by finding the weight values for each attribute. Then do the ranking process that determines the optimal alternative to the best applicants who qualify as employees of the company. Based on calculations by the SAW obtained the two highest ranking results are A5 (alternative 5 and A1 (alternative 1, to obtain two candidates received.

  18. The Astronomy and Space Science Concept Inventory: Assessment Instruments Aligned with the K-12 National Science Standards

    Science.gov (United States)

    Sadler, Philip M.

    2011-01-01

    We report on the development of an item test bank and associated instruments based on those K-12 national standards which involve astronomy and space science. Utilizing hundreds of studies in the science education research literature on student misconceptions, we have constructed 211 unique items that measure the degree to which students abandon such ideas for accepted scientific views. Piloted nationally with 7599 students and their 88 teachers spanning grades 5-12, the items reveal a range of interesting results, particularly student difficulties in mastering the NRC Standards and AAAS Benchmarks. Teachers generally perform well on items covering the standards of the grade level at which they teach, exhibiting few misconceptions of their own. Teachers dramatically overestimate their students’ performance, perhaps because they are unaware of their students’ misconceptions. Examples are given showing how the developed instruments can be used to assess the effectiveness of instruction and to evaluate the impact of professional development activities for teachers.

  19. Binding of a nitroxyl to radiation-induced DNA transients in repair and repair deficient of E. coli K-12

    Energy Technology Data Exchange (ETDEWEB)

    Wold, E; Brustad, T [Norsk Hydros Institutt for Kreftforskning, Oslo

    1975-01-01

    Binding of tritiated 2,2,6,6-tetramethyl-4-piperidone-N-oxyl (/sup 3/H-TAN) to radiation-induced DNA-transients in E. coli K-12 strains AB 1157 and JO 307 rec A uvr A has been studied under in vivo conditions. After irradiation the cells were washed and resuspended in growth medium and left overnight at 37 deg C. Within an uncertainty of about 10 %, no effect of repair could be detected on the yield of TAN bound to DNA for any of the strains. During the period after resuspension TAN or fragments of TAN leaked out of the irradiated cell samples. This leakage may be attributed to semi-permanent association between TAN and radiation-induced radicals within the cell. The relevance of different interactions between TAN and transients in DNA is discussed.

  20. DnaB gene product-independence of DNA polymerase III-directed repair synthesis in Escherichia coli K-12

    International Nuclear Information System (INIS)

    Billen, D.; Hellermann, G.R.

    1977-01-01

    An investigation has been carried out into the role of dnaB gene product in X-ray-induced repair synthesis carried out by DNA polymerase III in toluene-treated Escherichia coli K-12. A polAl polBlOO dnaB mutant deficient in both DNA polymerase I and II activities was used, and it was shown that the level of X-ray-induced, ATP-dependent, non-conservative DNA synthesis was, unlike semi-conservative DNA synthesis, unaffected by a temperature shift from 30 0 to 42 0 C. The dnaB gene product was not therefore necessary for DNA polymerase III-directed repair synthesis, which occurred in the absence of replicative synthesis. (U.K.)

  1. Organizational Policies and Programs to Reduce Job Stress and Risk of Workplace Violence Among K-12 Education Staff.

    Science.gov (United States)

    Landsbergis, Paul; Zoeckler, Jeanette; Kashem, Zerin; Rivera, Bianca; Alexander, Darryl; Bahruth, Amy

    2018-02-01

    We examine strategies, programs, and policies that educators have developed to reduce work stressors and thus health risks. First, we review twenty-seven empirical studies and review papers on organizational programs and policies in K-12 education published from 1990 to 2015 and find some evidence that mentoring, induction, and Peer Assistance and Review programs can increase support, skill development, decision-making authority, and perhaps job security, for teachers-and thus have the potential to reduce job stressors. Second, we describe efforts to reduce workplace violence in Oregon, especially in special education, including legislation, collective bargaining, research, and public awareness. We conclude that to reduce workplace violence, adequate resources are needed for staffing, training, equipment, injury/assault reporting, and investigation. Third, we discuss collective bargaining initiatives that led to mentoring and Peer Assistance and Review and state legislation on prevention of bullying and harassment of school staff. Finally, we present a research agenda on these issues.

  2. The Delicate Balance between Research, Teaching and Outreach: A Case Study of Physicists in K-12 Education

    Science.gov (United States)

    Leslie-Pelecky, Diandra

    2003-04-01

    Recent calls from a variety of sectors including some funding agencies and professional societies encourage physicists to take a more active interest in the education of K-12 students and their teachers. Although there are a broad range of possible activities, finding time to participate is always a challenge for the researcher. How does the busy physicist ensure that the time devoted to education or outreach activities produces meaningful results without adversely affecting his or her research program? Project Fulcrum, a NSF-funded program that teams science and math graduate students at the University of Nebraska-Lincoln with 4th -8th grade teachers in the Lincoln Public Schools, presents a case study of how research scientists can be meaningfully involved with K-12 education. Project Fulcrum's preliminary results indicate that the impact scientists have in the classroom goes far beyond providing expertise in physics, and turns out to be very different than originally anticipated. There are a wide variety of models for involvement in education and outreach that cover a broad span of time and energy commitments. Careful project choice, establishing administrative infrastructure, collaborating with other departments and colleges, and involving colleagues can optimize the impact-made-to-time-spent ratio. Challenges such as project evaluation, overcoming the negative attitudes of some physicists towards anything not related to research, and ensuring that participants get appropriate credit for their efforts will also be discussed. The conclusion will address the personal and professional rewards of involvement in education and outreach. This work is funded by the National Science Foundation (NSF-DGE0086358). The author wishes to acknowledge the contributions of co-PIs G. Buck, S. Kirby, R. Kirby and P. Dussault, and all of the Project Fulcrum Fellows and Teachers.

  3. K-12 Students' Perceptions of Scientists: Finding a valid measurement and exploring whether exposure to scientists makes an impact

    Science.gov (United States)

    Hillman, Susan J.; Bloodsworth, Kylie H.; Tilburg, Charles E.; Zeeman, Stephan I.; List, Henrietta E.

    2014-10-01

    This study was launched from a National Science Foundation GK-12 grant in which graduate fellows in Science, Technology, Engineering, and Mathematics (STEM) are placed in classrooms to engage K-12 students in STEM activities. The investigation explored whether the STEM Fellows' presence impacted the K-12 students' stereotypical image of a scientist. Since finding a valid instrument is critical, the study involved (1) determining the validity of the commonly administered Draw-A-Scientist Test (DAST) against a newly designed six-question survey and (2) using a combination of both instruments to determine what stereotypes are currently held by children. A pretest-posttest design was used on 485 students, grades 3-11, attending 6 different schools in suburban and rural Maine communities. A significant but low positive correlation was found between the DAST and the survey; therefore, it is imperative that the DAST not be used alone, but corroboration with interviews or survey questions should occur. Pretest results revealed that the children held common stereotypes of scientists, but these stereotypes were neither as extensive nor did they increase with the grade level as past research has indicated, suggesting that a shift has occurred with children having a broader concept of who a scientist can be. Finally, the presence of an STEM Fellow corresponded with decreased stereotypes in middle school and high school, but no change in elementary age children. More research is needed to determine whether this reflects resiliency in elementary children's perceptions or limitations in either drawing or in writing out their responses.

  4. Decision Support System to Choose Digital Single Lens Camera with Simple Additive Weighting Method

    Directory of Open Access Journals (Sweden)

    Tri Pina Putri

    2016-11-01

    Full Text Available One of the technologies that evolve today is Digital Single Lens Reflex (DSLR camera. The number of products makes users have difficulties to choose the appropriate camera based on their criteria. Users may utilize several ways to help them choosing the intended camera such as using magazine, internet, and other media. This paper discusses about a web based decision support system to choose cameras by using SAW (Simple Additive Weighting method in order to make the decision process more effective and efficient. This system is expected to give recommendations about the camera which is appropriate with the user’s need and criteria based on the cost, the resolution, the feature, the ISO, and the censor. The system was implemented by using PHP and MySQL. Based on the result of questionnaire distributed to 20 respondents, 60% respondents agree that this decision support system can help users to choose the appropriate camera DSLR in accordance with the user’s need, 60% of respondents agree that this decision support system is more effective to choose DSLR camera and 75% of respondents agree that this system is more efficient. In addition, 60.55% of respondents agree that this system has met 5 Es Usability Framework.

  5. Sustainable Materials Management (SMM) Web Academy Webinar: Changing How We Think About Our Resources for a Better Tomorrow: How to Donate Surplus Food from K-12 Schools

    Science.gov (United States)

    This is a webinar page for the Sustainable Management of Materials (SMM) Web Academy webinar titled Changing How We Think About Our Resources for a Better Tomorrow: How to Donate Surplus Food from K-12 Schools

  6. Lactic Acid Fermentation, Urea and Lime Addition: Promising Faecal Sludge Sanitizing Methods for Emergency Sanitation.

    Science.gov (United States)

    Anderson, Catherine; Malambo, Dennis Hanjalika; Perez, Maria Eliette Gonzalez; Nobela, Happiness Ngwanamoseka; de Pooter, Lobke; Spit, Jan; Hooijmans, Christine Maria; de Vossenberg, Jack van; Greya, Wilson; Thole, Bernard; van Lier, Jules B; Brdjanovic, Damir

    2015-10-29

    In this research, three faecal sludge sanitizing methods-lactic acid fermentation, urea treatment and lime treatment-were studied for application in emergency situations. These methods were investigated by undertaking small scale field trials with pit latrine sludge in Blantyre, Malawi. Hydrated lime was able to reduce the E. coli count in the sludge to below the detectable limit within 1 h applying a pH > 11 (using a dosage from 7% to 17% w/w, depending faecal sludge alkalinity), urea treatment required about 4 days using 2.5% wet weight urea addition, and lactic acid fermentation needed approximately 1 week after being dosed with 10% wet weight molasses (2 g (glucose/fructose)/kg) and 10% wet weight pre-culture (99.8% pasteurised whole milk and 0.02% fermented milk drink containing Lactobacillus casei Shirota). Based on Malawian prices, the cost of sanitizing 1 m³ of faecal sludge was estimated to be €32 for lactic acid fermentation, €20 for urea treatment and €12 for hydrated lime treatment.

  7. Determination of oxygen in ternary uranium oxides by a gravimetric alkaline earth addition method

    International Nuclear Information System (INIS)

    Fujino, T.; Tagawa, H.

    1979-01-01

    The applicability of a gravimetric method based on alkaline earth metal addition for the determination of oxygen in ternary uranium oxides of the tupe M-U-O (M=La, Ce and Th) is described. The oxide sample is mixed with MgO or Basub(2.8)UOsub(5.8) and heated in air under suitable conditions. Because uranium is completely oxidized to the hexavalent state during the reaction, oxygen can be determined from the weight change. Oxygen in Lasub(y)Usub(1-y)Osub(2+x) is determined up to y = 0.8 with a standard deviation for x of +- 0.006 with MgO. For Thsub(y)Usub(1-y)Osub(2+x) the value of x is determined with Basub(2.8)UOsub(5.8) with a standard deviation of +- 0.01 at y = 0.8. For Cesub(y)Usub(1-y)Osub(2+x), the method can be applied only for low cerium concentrations where y = 0-0.2; the value for x with Basub(2.8)UOsub(5.8) at y = 0.2 showed a standard deviation of +- 0.002. (Auth.)

  8. Multiple Linkage Disequilibrium Mapping Methods to Validate Additive Quantitative Trait Loci in Korean Native Cattle (Hanwoo

    Directory of Open Access Journals (Sweden)

    Yi Li

    2015-07-01

    Full Text Available The efficiency of genome-wide association analysis (GWAS depends on power of detection for quantitative trait loci (QTL and precision for QTL mapping. In this study, three different strategies for GWAS were applied to detect QTL for carcass quality traits in the Korean cattle, Hanwoo; a linkage disequilibrium single locus regression method (LDRM, a combined linkage and linkage disequilibrium analysis (LDLA and a BayesCπ approach. The phenotypes of 486 steers were collected for weaning weight (WWT, yearling weight (YWT, carcass weight (CWT, backfat thickness (BFT, longissimus dorsi muscle area, and marbling score (Marb. Also the genotype data for the steers and their sires were scored with the Illumina bovine 50K single nucleotide polymorphism (SNP chips. For the two former GWAS methods, threshold values were set at false discovery rate <0.01 on a chromosome-wide level, while a cut-off threshold value was set in the latter model, such that the top five windows, each of which comprised 10 adjacent SNPs, were chosen with significant variation for the phenotype. Four major additive QTL from these three methods had high concordance found in 64.1 to 64.9Mb for Bos taurus autosome (BTA 7 for WWT, 24.3 to 25.4Mb for BTA14 for CWT, 0.5 to 1.5Mb for BTA6 for BFT and 26.3 to 33.4Mb for BTA29 for BFT. Several candidate genes (i.e. glutamate receptor, ionotropic, ampa 1 [GRIA1], family with sequence similarity 110, member B [FAM110B], and thymocyte selection-associated high mobility group box [TOX] may be identified close to these QTL. Our result suggests that the use of different linkage disequilibrium mapping approaches can provide more reliable chromosome regions to further pinpoint DNA makers or causative genes in these regions.

  9. Stable solidification of cesium with an allophane additive by a pressing/sintering method

    Energy Technology Data Exchange (ETDEWEB)

    Zhang, Xiaoxia [School of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240 (China); Wu, Yan, E-mail: wu_yan@sjtu.edu.cn [School of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240 (China); Wei, Yuezhou [School of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240 (China); College of Resources and Metallurgy, Guangxi University, Nanning, 530004 (China); Mimura, Hitoshi; Matsukura, Minoru [UNION SHOWA K.K., 1-8-40Kounan Minato-ku, Tokyo, 108-0075 (Japan)

    2017-03-15

    Pyrolysis of AMP/SiO{sub 2} adsorbed Cs (AMP-Cs/SiO{sub 2}) occurred at > 400 °C sintering temperature, and Cs immobilisation decreased from 100% to 40% after sintering at 1200 °C. To safely dispose radioactive Cs, allophane was immobilized with AMP-Cs/SiO{sub 2} to prepare a stable form by using a pressing/sintering method. The structure of AMP-Cs/SiO{sub 2} collapsed, and cesium aluminosilicate formed more easily under conditions of higher sintering temperature (>800 °C) or increasing mixing ratio of allophane (mass ratio = 1:3 AMP-Cs/SiO{sub 2}-allophane). The decomposition products of AMP-Cs/SiO{sub 2} were Cs{sub 2}O, MoO{sub 3} and P{sub 2}O{sub 5} at 1200 °C. Cs{sub 2}O volatilisation was depressed by allophane addition, and a stable immobilisation phase of Cs{sub 4}Al{sub 4}Si{sub 20}O{sub 48} formed. An immobilisation ratio of Cs of approximately 100% was maintained. The leachability of Cs for AMP-Cs/SiO{sub 2}-allophane (1:3, 1200 °C) in distilled water at 25 °C and 90 °C for 15 days was estimated as 0.174% and 1.55%, respectively. - Highlights: • A pressing/sintering method was used to solidify AMP-Cs/SiO{sub 2}-allophane. • The volatility of Cs{sub 2}O could be effectively restrained by allophane. • Cs{sub 4}Al{sub 4}Si{sub 20}O{sub 48} was formed for stable solidification of Cs. • The leachability of Cs from sintered AMP-Cs/SiO{sub 2}-allophane was relatively low.

  10. Comparison of presbyopic additions determined by the fused cross-cylinder method using alternative target background colours.

    Science.gov (United States)

    Wee, Sung-Hyun; Yu, Dong-Sik; Moon, Byeong-Yeon; Cho, Hyun Gug

    2010-11-01

    To compare and contrast standard and alternative versions of refractor head (phoropter)-based charts used to determine reading addition. Forty one presbyopic subjects aged between 42 and 60 years were tested. Tentative additions were determined using a red-green background letter chart, and 4 cross-grid charts (with white, red, green, or red-green backgrounds) which were used with the fused cross cylinder (FCC) method. The final addition for a 40 cm working distance was determined for each subject by subjectively adjusting the tentative additions. There were significant differences in the tentative additions obtained using the 5 methods (repeated measures ANOVA, p FCC method. There were no significant differences between the tentative and final additions for the green background in the FCC method (p > 0.05). The intervals of the 95% limits of agreement were under ±0.50 D, and the narrowest interval (±0.26 D) was for the red-green background. The 3 FCC methods with a white, green, or red-green background provided a tentative addition close to the final addition. Compared with the other methods, the FCC method with the red-green background had a narrow range of error. Further, since this method combines the functions of both the fused cross-cylinder test and the duochrome test, it can be a useful technique for determining presbyopic additions. © 2010 The Authors. Ophthalmic and Physiological Optics © 2010 The College of Optometrists.

  11. K-12 Students, Teachers, Parents, Administrators and Higher Education Faculty: Partners Helping Rural Disadvantaged Students Stay on the Pathway to a Geoscience Career

    Science.gov (United States)

    Slattery, W.; Antonucci, C.; Myers, R. J.

    2013-12-01

    The National Science Foundation funded project K-12 Students, Teachers, Parents, Administrators and Higher Education Faculty: Partners Helping Rural Disadvantaged Students Stay on the Pathway to a Geoscience Career is a research-based proof of concept track 1 pilot project that tests the effectiveness of an innovative model for simultaneous K-12 teacher professional development, student learning and workforce development. The project builds a network of science experiences designed to keep eighth and ninth grade students from the Ripley, Union, Lewis, Huntington (RULH) Ohio school district on the path to a geoscience career. During each summer of the ongoing two-year project teams of RULH students, parents, teachers, administrators and college faculty traveled to the facilities of the New Jersey Sea Grant Consortium at Sandy Hook, New Jersey to study science from an Earth system perspective. Teachers had the opportunity to engage in professional development alongside their students. Parents participated in the science activities alongside their children. Administrators interacted with students, parents and their teachers and saw them all learning science in an engaging, collaborative setting. During the first academic year of the project professional development was provided to RULH teachers by a team of university scientists and geoscience educators from the Earth System Science Education Alliance (ESSEA), a National Science Foundation funded project. Teachers selected for professional development were from science disciplines, mathematics, language arts and civics. The teachers selected, taught and assessed ESSEA Earth system science modules to all eighth and ninth grade students, not just those that were selected to go on the summer trips to New Jersey. In addition, all ninth grade RULH students had the opportunity to take a course that includes Earth system science concepts that will earn them both high school and college science credits. Professional

  12. River catchment rainfall series analysis using additive Holt-Winters method

    Science.gov (United States)

    Puah, Yan Jun; Huang, Yuk Feng; Chua, Kuan Chin; Lee, Teang Shui

    2016-03-01

    Climate change is receiving more attention from researchers as the frequency of occurrence of severe natural disasters is getting higher. Tropical countries like Malaysia have no distinct four seasons; rainfall has become the popular parameter to assess climate change. Conventional ways that determine rainfall trends can only provide a general result in single direction for the whole study period. In this study, rainfall series were modelled using additive Holt-Winters method to examine the rainfall pattern in Langat River Basin, Malaysia. Nine homogeneous series of more than 25 years data and less than 10% missing data were selected. Goodness of fit of the forecasted models was measured. It was found that seasonal rainfall model forecasts are generally better than the monthly rainfall model forecasts. Three stations in the western region exhibited increasing trend. Rainfall in southern region showed fluctuation. Increasing trends were discovered at stations in the south-eastern region except the seasonal analysis at station 45253. Decreasing trend was found at station 2818110 in the east, while increasing trend was shown at station 44320 that represents the north-eastern region. The accuracies of both rainfall model forecasts were tested using the recorded data of years 2010-2012. Most of the forecasts are acceptable.

  13. Electrospining method to synthesize compositebased on alginate-polyvinyl alcohol with addition of snail (Achatina fulica)

    International Nuclear Information System (INIS)

    Meilanny DKP; Pranjono; Dyah Hikmawati

    2015-01-01

    Many materials that can be used as wound coverings, one is alginate. Alginate has a high absorption capacity and has a role as a gelling agent which has hemostatic properties. Rigid and brittle nature is weakness of alginate and to improve the properties of the alginate can be mixed with the vinyl polymers are compatible and flexible. PVA is a water-soluble polymer, has a good ability to form fibers, biocompatible, has a chemical resistance, and biodegradable. For further improve the quality of wound closure, this research used the method electrospining . This experiment was carried out at a distance of 8 cm with a voltage of 17 kV, 20 kV, 23 kV, 25 kV and 27 kV. Testing is done using FTIR test to determine functional groups which is formed and analysis of the microstructure using SEM. FTIR test results showed that with the addition of lendr snail does not produce new functional groups. At a voltage of 23 kV can produce a fibers with micro size with nano fiber produced is also very continuous. (author)

  14. Additivity methods for prediction of thermochemical properties. The Laidler method revisited. 2. Hydrocarbons including substituted cyclic compounds

    International Nuclear Information System (INIS)

    Santos, Rui C.; Leal, Joao P.; Martinho Simoes, Jose A.

    2009-01-01

    A revised parameterization of the extended Laidler method for predicting standard molar enthalpies of atomization and standard molar enthalpies of formation at T = 298.15 K for several families of hydrocarbons (alkanes, alkenes, alkynes, polyenes, poly-ynes, cycloalkanes, substituted cycloalkanes, cycloalkenes, substituted cycloalkenes, benzene derivatives, and bi and polyphenyls) is presented. Data for a total of 265 gas-phase and 242 liquid-phase compounds were used for the calculation of the parameters. Comparison of the experimental values with those obtained using the additive scheme led to an average absolute difference of 0.73 kJ . mol -1 for the gas-phase standard molar enthalpy of formation and 0.79 kJ . mol -1 for the liquid-phase standard molar enthalpy of formation. The database used to establish the parameters was carefully reviewed by using, whenever possible, the original publications. A worksheet to simplify the calculation of standard molar enthalpies of formation and standard molar enthalpies of atomization at T = 298.15 K based on the extended Laidler parameters defined in this paper is provided as supplementary material.

  15. Genetic control of near-UV (300-400 nm) sensitivity independent of the recA gene in strains of Escherichia coli K12

    International Nuclear Information System (INIS)

    Tuveson, R.W.; Jonas, R.B.

    1979-01-01

    Stationary cells of isogenic pairs of Escherichia coli K12 strains presumably differing only in the recA function, were inactivated with near-UV (300-400 nm) radiation. Based on near-UV inactivation kinetics, the strains can be divided into two discrete categories in which near-UV sensitivity does not necessarily correlate with far-UV sensitivity conferred by two different recA alleles. Lack of overlap between near-UV and far-UV (recA) sensitivity can be explained by assuming that a different chromosomal gene (nur) controls near-UV sensitivity. Support for this hypothesis came from a mating experiment in which four selected recombinants, isogenic with respect to auxotrophic markers, were identified exhibiting all four possible combinations of far-UV (recA1 vs recA + ) and near-UV sensitivity (nur vs nur + ). Transduction with phase P1 showed that introduction of the recA1 allele into a recA + recipient did not affect the near-UV sensitivity of the recipient. Additional matings together with transduction experiments suggested that the nur gene is located at a position on the E. coli linkage map clearly separable from recA (minute 58). (author)

  16. Adherence to abiotic surface induces SOS response in Escherichia coli K-12 strains under aerobic and anaerobic conditions.

    Science.gov (United States)

    Costa, Suelen B; Campos, Ana Carolina C; Pereira, Ana Claudia M; de Mattos-Guaraldi, Ana Luiza; Júnior, Raphael Hirata; Rosa, Ana Cláudia P; Asad, Lídia M B O

    2014-09-01

    During the colonization of surfaces, Escherichia coli bacteria often encounter DNA-damaging agents and these agents can induce several defence mechanisms. Base excision repair (BER) is dedicated to the repair of oxidative DNA damage caused by reactive oxygen species (ROS) generated by chemical and physical agents or by metabolism. In this work, we have evaluated whether the interaction with an abiotic surface by mutants derived from E. coli K-12 deficient in some enzymes that are part of BER causes DNA damage and associated filamentation. Moreover, we studied the role of endonuclease V (nfi gene; 1506 mutant strain) in biofilm formation. Endonuclease V is an enzyme that is involved in DNA repair of nitrosative lesions. We verified that endonuclease V is involved in biofilm formation. Our results showed more filamentation in the xthA mutant (BW9091) and triple xthA nfo nth mutant (BW535) than in the wild-type strain (AB1157). By contrast, the mutant nfi did not present filamentation in biofilm, although its wild-type strain (1466) showed rare filaments in biofilm. The filamentation of bacterial cells attaching to a surface was a consequence of SOS induction measured by the SOS chromotest. However, biofilm formation depended on the ability of the bacteria to induce the SOS response since the mutant lexA Ind(-) did not induce the SOS response and did not form any biofilm. Oxygen tension was an important factor for the interaction of the BER mutants, since these mutants exhibited decreased quantitative adherence under anaerobic conditions. However, our results showed that the presence or absence of oxygen did not affect the viability of BW9091 and BW535 strains. The nfi mutant and its wild-type did not exhibit decreased biofilm formation under anaerobic conditions. Scanning electron microscopy was also performed on the E. coli K-12 strains that had adhered to the glass, and we observed the presence of a structure similar to an extracellular matrix that depended on the

  17. In Vitro Assembly of the Outer Core of the Lipopolysaccharide from Escherichia coli K-12 and Salmonella typhimurium

    Science.gov (United States)

    2015-01-01

    There are five distinct core structures in the lipopolysaccharides of Escherichia coli and at least two in Salmonella isolates, which vary principally in the outer core oligosaccharide. Six outer core glycosyltransferases, E. coli K-12 WaaG, WaaB, and WaaO and Salmonella typhimurium WaaI, WaaJ, and WaaK, were cloned, overexpressed, and purified. A novel substrate for WaaG was isolated from ΔwaaG E. coli overexpressing the lipid A phosphatase lpxE and the lipid A late acyltransferase lpxM. The action of lpxE and lpxM in the ΔwaaG background yielded heptose2-1-dephospho Kdo2-lipid A, a 1-dephosphorylated hexa-acylated lipid A with the inner core sugars that is easily isolated by organic extraction. Using this structurally defined acceptor and commercially available sugar nucleotides, each outer core glycosyltransferases was assayed in vitro. We show that WaaG and WaaB add a glucose and galactose sequentially to heptose2-1-dephospho Kdo2-lipid A. E. coli K-12 WaaO and S. typhimurium WaaI add a galactose to the WaaG/WaaB product but can also add a galactose to the WaaG product directly without the branched core sugar added by WaaB. Both WaaI and WaaO require divalent metal ions for optimal activity; however, WaaO, unlike WaaI, can add several glucose residues to its lipid acceptor. Using the product of WaaG, WaaB, and WaaI, we show that S. typhimurium WaaJ and WaaK transfer a glucose and N-acetylglucosamine, respectively, to yield the full outer core. This is the first demonstration of the in vitro assembly of the outer core of the lipopolysaccharide using defined lipid A-oligosaccharide acceptors and sugar donors. PMID:24479701

  18. Teacher Directed Design: Content Knowledge, Pedagogy and Assessment under the Nevada K-12 Real-Time Seismic Network

    Science.gov (United States)

    Cantrell, P.; Ewing-Taylor, J.; Crippen, K. J.; Smith, K. D.; Snelson, C. M.

    2004-12-01

    Education professionals and seismologists under the emerging SUN (Shaking Up Nevada) program are leveraging the existing infrastructure of the real-time Nevada K-12 Seismic Network to provide a unique inquiry based science experience for teachers. The concept and effort are driven by teacher needs and emphasize rigorous content knowledge acquisition coupled with the translation of that knowledge into an integrated seismology based earth sciences curriculum development process. We are developing a pedagogical framework, graduate level coursework, and materials to initiate the SUN model for teacher professional development in an effort to integrate the research benefits of real-time seismic data with science education needs in Nevada. A component of SUN is to evaluate teacher acquisition of qualified seismological and earth science information and pedagogy both in workshops and in the classroom and to assess the impact on student achievement. SUN's mission is to positively impact earth science education practices. With the upcoming EarthScope initiative, the program is timely and will incorporate EarthScope real-time seismic data (USArray) and educational materials in graduate course materials and teacher development programs. A number of schools in Nevada are contributing real-time data from both inexpensive and high-quality seismographs that are integrated with Nevada regional seismic network operations as well as the IRIS DMC. A powerful and unique component of the Nevada technology model is that schools can receive "stable" continuous live data feeds from 100's seismograph stations in Nevada, California and world (including live data from Earthworm systems and the IRIS DMC BUD - Buffer of Uniform Data). Students and teachers see their own networked seismograph station within a global context, as participants in regional and global monitoring. The robust real-time Internet communications protocols invoked in the Nevada network provide for local data acquisition

  19. Net Analyte Signal Standard Additions Method for Simultaneous Determination of Sulfamethoxazole and Trimethoprim in Pharmaceutical Formulations and Biological Fluids

    OpenAIRE

    Givianrad, M. H.; Mohagheghian, M.

    2012-01-01

    The applicability of a novel net analyte signal standard addition method (NASSAM) to the resolving of overlapping spectra corresponding to the sulfamethoxazole and trimethoprim was verified by UV-visible spectrophotometry. The results confirmed that the net analyte signal standard additions method with simultaneous addition of both analytes is suitable for the simultaneous determination of sulfamethoxazole and trimethoprim in aqueous media. Moreover, applying the net analyte signal standard a...

  20. A habitat suitability model for Chinese sturgeon determined using the generalized additive method

    Science.gov (United States)

    Yi, Yujun; Sun, Jie; Zhang, Shanghong

    2016-03-01

    The Chinese sturgeon is a type of large anadromous fish that migrates between the ocean and rivers. Because of the construction of dams, this sturgeon's migration path has been cut off, and this species currently is on the verge of extinction. Simulating suitable environmental conditions for spawning followed by repairing or rebuilding its spawning grounds are effective ways to protect this species. Various habitat suitability models based on expert knowledge have been used to evaluate the suitability of spawning habitat. In this study, a two-dimensional hydraulic simulation is used to inform a habitat suitability model based on the generalized additive method (GAM). The GAM is based on real data. The values of water depth and velocity are calculated first via the hydrodynamic model and later applied in the GAM. The final habitat suitability model is validated using the catch per unit effort (CPUEd) data of 1999 and 2003. The model results show that a velocity of 1.06-1.56 m/s and a depth of 13.33-20.33 m are highly suitable ranges for the Chinese sturgeon to spawn. The hydraulic habitat suitability indexes (HHSI) for seven discharges (4000; 9000; 12,000; 16,000; 20,000; 30,000; and 40,000 m3/s) are calculated to evaluate integrated habitat suitability. The results show that the integrated habitat suitability reaches its highest value at a discharge of 16,000 m3/s. This study is the first to apply a GAM to evaluate the suitability of spawning grounds for the Chinese sturgeon. The study provides a reference for the identification of potential spawning grounds in the entire basin.

  1. Cell survival, UV-reactivation and induction of prophage lambda in Escherichia coli K12 overproducing RecA protein

    International Nuclear Information System (INIS)

    Quillardet, P.; Moreau, P.L.; Devoret, R.; Ginsburg, H.; Mount, D.W.

    1982-01-01

    The effect of the cellular level of RecA protein on the ability of E. coli K12 bacteria to (I) survive UV-irradiation (II) promote UV-reactivation of UV-damaged phage lambda (III) induce prophage lambda was determined in bacterial mutants with discrete increasing levels of RecA protein. The various levels of RecA protein were obtained by combining lexA and recA alleles. Except for the double mutant lexA3 recAo98, whose repair ability was 25% less than that observed in wild type bacteria, bacterial survival was proportional to the level of ReCA protein measured after 90 min of incubation. In lexA3 recAo98 bacteria, RecA protein, at a constitutive high basal level, failed to compensate totally for the lack of LexA repressor cleavage; UV-reactivation of UV-damaged phage lambda was not restored; yet, prophage lambda was induced with 35% efficiency. Efficient UV-induction of prophage lambda is linked to the induction of lexA-controlled host processes that repair the UV-damaged prophage. (orig.)

  2. Secrets of the Sediments: Using ANDRILL's Scientific Adventure on Ice to Transfer Climate Change Science to K-12 Audiences

    Science.gov (United States)

    Huffman, L. T.; Dahlman, L.; Frisch-Gleason, R.; Harwood, D.; Pound, K.; Rack, F.; Riesselman, C.; Trummel, E.; Tuzzi, E.; Winter, D.

    2008-12-01

    Antarctica's harsh environment and the compelling story of living and working there, provides the backdrop for hooking the interest of young learners on science research and the nature of science. By using the adventure stories of today's researcher-explorers, teachers accompanying the ANDRILL team have taken the technical science of drilling rock cores to understand the history of climate change and the advance and retreat of the Antarctic ice sheet, and translated it for non-technical audiences from K-12 school children, to adult community groups. In order to understand the important issues surrounding global climate change, members of the public need access to accurate and relevant information, high quality educational materials, and a variety of learning opportunities in different learning environments. By taking lessons learned from early virtual polar adventure learning expeditions like Will Steger's Trans-Antarctic Expedition, coupled with educators-in-the-field programs like TEA (Teachers Experiencing Antarctica and the Arctic), ARMADA and Polar Trec, ANDRILL's Education and Outreach Program has evolved into successful and far-reaching integrated education projects including 1) the ARISE (ANDRILL Research Immersion for Science Educators) Program, 2) Climate Change Student Summits, 3) the development of Flexhibit (flexible exhibit) teaching resources, 4) virtual online learning communities, and 5) partnering young researchers with teachers and classrooms. Formal evaluations indicate lasting interest in science studies on the part of students and an increase in teachers' scientific background knowledge.

  3. Crystallization and preliminary X-ray diffraction analysis of ybfF, a new esterase from Escherichia coli K12

    Energy Technology Data Exchange (ETDEWEB)

    Park, Suk-Youl; Lee, Sang-Hak; Lee, Jieun; Jung, Che-Hun; Kim, Jeong-Sun, E-mail: jsunkim@chonnam.ac.kr [Department of Chemistry and Institute of Basic Sciences, Chonnam National University, Gwangju 500-757 (Korea, Republic of)

    2007-12-01

    The crystallization of ybfF, a new esterase from E. coli, and the collection of diffraction data to 1.1 Å resolution are reported. The product of the recently discovered ybfF gene, which belongs to the esterase family, does not show high sequence similarity to other esterases. To provide the molecular background to the enzymatic mechanism of the ybfF esterase, the ybfF protein from Escherichia coli K12 (Ec-ybfF) was cloned, expressed and purified. The Ec-ybfF protein was crystallized from 60% Tacsimate and 0.1 M bis-Tris propane buffer pH 7.0. Diffraction data were collected to 1.10 Å resolution using synchrotron radiation. The crystal belongs to the orthorhombic space group P2{sub 1}2{sub 1}2{sub 1}, with unit-cell parameters a = 66.09, b = 90.71, c = 92.88 Å. With two Ec-ybfF molecules in the asymmetric unit, the crystal volume per unit protein weight is 2.17 Å{sup 3} Da{sup −1}, corresponding to a solvent content of 42%.

  4. A review of Computer Science resources for learning and teaching with K-12 computing curricula: an Australian case study

    Science.gov (United States)

    Falkner, Katrina; Vivian, Rebecca

    2015-10-01

    To support teachers to implement Computer Science curricula into classrooms from the very first year of school, teachers, schools and organisations seek quality curriculum resources to support implementation and teacher professional development. Until now, many Computer Science resources and outreach initiatives have targeted K-12 school-age children, with the intention to engage children and increase interest, rather than to formally teach concepts and skills. What is the educational quality of existing Computer Science resources and to what extent are they suitable for classroom learning and teaching? In this paper, an assessment framework is presented to evaluate the quality of online Computer Science resources. Further, a semi-systematic review of available online Computer Science resources was conducted to evaluate resources available for classroom learning and teaching and to identify gaps in resource availability, using the Australian curriculum as a case study analysis. The findings reveal a predominance of quality resources, however, a number of critical gaps were identified. This paper provides recommendations and guidance for the development of new and supplementary resources and future research.

  5. INCREASING ACHIEVEMENT AND HIGHER-EDUCATION REPRESENTATION OF UNDER-REPRESENTED GROUPS IN SCIENCE, TECHNOLOGY, ENGINEERING, AND MATHEMATICS FIELDS: A REVIEW OF CURRENT K-12 INTERVENTION PROGRAMS.

    Science.gov (United States)

    Valla, Jeffrey M; Williams, Wendy M

    2012-01-01

    The under-representation of women and ethnic minorities in Science, Technology, Engineering, and Mathematics (STEM) education and professions has resulted in a loss of human capital for the US scientific workforce and spurred the development of myriad STEM educational intervention programs. Increased allocation of resources to such programs begs for a critical, prescriptive, evidence-based review that will enable researchers to develop optimal interventions and administrators to maximize investments. We begin by providing a theoretical backdrop for K-12 STEM programs by reviewing current data on under-representation and developmental research describing individual-level social factors undergirding these data. Next, we review prototypical designs of these programs, highlighting specific programs in the literature as examples of program structures and components currently in use. We then evaluate these interventions in terms of overall effectiveness, as a function of how well they address age-, ethnicity-, or gender-specific factors, suggesting improvements in program design based on these critiques. Finally, program evaluation methods are briefly reviewed and discussed in terms of how their empirical soundness can either enable or limit our ability to delineate effective program components. "Now more than ever, the nation's changing demographics demand that we include all of our citizens in science and engineering education and careers. For the U.S. to benefit from the diverse talents of all its citizens, we must grow the pipeline of qualified, underrepresented minority engineers and scientists to fill positions in industry and academia."-Irving P. McPhail..

  6. A systems biology approach identified different regulatory networks targeted by KSHV miR-K12-11 in B cells and endothelial cells.

    Science.gov (United States)

    Yang, Yajie; Boss, Isaac W; McIntyre, Lauren M; Renne, Rolf

    2014-08-08

    Kaposi's sarcoma associated herpes virus (KSHV) is associated with tumors of endothelial and lymphoid origin. During latent infection, KSHV expresses miR-K12-11, an ortholog of the human tumor gene hsa-miR-155. Both gene products are microRNAs (miRNAs), which are important post-transcriptional regulators that contribute to tissue specific gene expression. Advances in target identification technologies and molecular interaction databases have allowed a systems biology approach to unravel the gene regulatory networks (GRNs) triggered by miR-K12-11 in endothelial and lymphoid cells. Understanding the tissue specific function of miR-K12-11 will help to elucidate underlying mechanisms of KSHV pathogenesis. Ectopic expression of miR-K12-11 differentially affected gene expression in BJAB cells of lymphoid origin and TIVE cells of endothelial origin. Direct miRNA targeting accounted for a small fraction of the observed transcriptome changes: only 29 genes were identified as putative direct targets of miR-K12-11 in both cell types. However, a number of commonly affected biological pathways, such as carbohydrate metabolism and interferon response related signaling, were revealed by gene ontology analysis. Integration of transcriptome profiling, bioinformatic algorithms, and databases of protein-protein interactome from the ENCODE project identified different nodes of GRNs utilized by miR-K12-11 in a tissue-specific fashion. These effector genes, including cancer associated transcription factors and signaling proteins, amplified the regulatory potential of a single miRNA, from a small set of putative direct targets to a larger set of genes. This is the first comparative analysis of miRNA-K12-11's effects in endothelial and B cells, from tissues infected with KSHV in vivo. MiR-K12-11 was able to broadly modulate gene expression in both cell types. Using a systems biology approach, we inferred that miR-K12-11 establishes its GRN by both repressing master TFs and influencing

  7. Net Analyte Signal Standard Additions Method for Simultaneous Determination of Sulfamethoxazole and Trimethoprim in Pharmaceutical Formulations and Biological Fluids

    Directory of Open Access Journals (Sweden)

    M. H. Givianrad

    2012-01-01

    Full Text Available The applicability of a novel net analyte signal standard addition method (NASSAM to the resolving of overlapping spectra corresponding to the sulfamethoxazole and trimethoprim was verified by UV-visible spectrophotometry. The results confirmed that the net analyte signal standard additions method with simultaneous addition of both analytes is suitable for the simultaneous determination of sulfamethoxazole and trimethoprim in aqueous media. Moreover, applying the net analyte signal standard additions method revealed that the two drugs could be determined simultaneously with the concentration ratios of sulfamethoxazole to trimethoprim varying from 1:35 to 60:1 in the mixed samples. In addition, the limits of detections were 0.26 and 0.23 μmol L-1 for sulfamethoxazole and trimethoprim, respectively. The proposed method has been effectively applied to the simultaneous determination of sulfamethoxazole and trimethoprim in some synthetic, pharmaceutical formulation and biological fluid samples.

  8. Further Insight and Additional Inference Methods for Polynomial Regression Applied to the Analysis of Congruence

    Science.gov (United States)

    Cohen, Ayala; Nahum-Shani, Inbal; Doveh, Etti

    2010-01-01

    In their seminal paper, Edwards and Parry (1993) presented the polynomial regression as a better alternative to applying difference score in the study of congruence. Although this method is increasingly applied in congruence research, its complexity relative to other methods for assessing congruence (e.g., difference score methods) was one of the…

  9. A method for additive bias correction in cross-cultural surveys

    DEFF Research Database (Denmark)

    Scholderer, Joachim; Grunert, Klaus G.; Brunsø, Karen

    2001-01-01

    additive bias from cross-cultural data. The procedure involves four steps: (1) embed a potentially biased item in a factor-analytic measurement model, (2) test for the existence of additive bias between populations, (3) use the factor-analytic model to estimate the magnitude of the bias, and (4) replace......Measurement bias in cross-cultural surveys can seriously threaten the validity of hypothesis tests. Direct comparisons of means depend on the assumption that differences in observed variables reflect differences in the underlying constructs, and not an additive bias that may be caused by cultural...... differences in the understanding of item wording or response category labels. However, experience suggests that additive bias can be found more often than not. Based on the concept of partial measurement invariance (Byrne, Shavelson and Muthén, 1989), the present paper develops a procedure for eliminating...

  10. Evaluation of the H-point standard additions method (HPSAM) and the generalized H-point standard additions method (GHPSAM) for the UV-analysis of two-component mixtures.

    Science.gov (United States)

    Hund, E; Massart, D L; Smeyers-Verbeke, J

    1999-10-01

    The H-point standard additions method (HPSAM) and two versions of the generalized H-point standard additions method (GHPSAM) are evaluated for the UV-analysis of two-component mixtures. Synthetic mixtures of anhydrous caffeine and phenazone as well as of atovaquone and proguanil hydrochloride were used. Furthermore, the method was applied to pharmaceutical formulations that contain these compounds as active drug substances. This paper shows both the difficulties that are related to the methods and the conditions by which acceptable results can be obtained.

  11. Development of the H-point standard additions method for coupled liquid-chromatography and UV-visible spectrophotometry

    Energy Technology Data Exchange (ETDEWEB)

    Campins-Falco, Pilar; Bosch-Reig, Francisco; Herraez-Hernandez, Rosa; Sevillano-Cabeza, Adela (Universidad de Valencia (Spain). Facultad de Quimica, Departamento de Quimica Analitica)

    1992-02-10

    This work establishes the fundamentals of the H-point standard additions method for liquid chromatography for the simultaneous analysis of binary mixtures with overlapped chromatographic peaks. The method was compared with the deconvolution method of peak suppression and the second derivative of elution profiles. Different mixtures of diuretics were satisfactorily resolved. (author). 21 refs.; 9 figs.; 2 tabs.

  12. Cycle for Science: An informal outreach program connecting K-12 students with renewable energy and physics through miniature 3D-printed, solar-powered bicycles

    Science.gov (United States)

    Woods-Robinson, R.; Case, E.

    2017-12-01

    Engaging communities with renewable energy is key to fighting climate change. Cycle for Science, an innovative STEM outreach organization, has reached more than 3,000 K-12 students across the United States by bringing early-career female scientists into classrooms to teach basic physics and solar energy engineering through hands-on, DIY science activities. We designed a fleet of miniature, 3D-printed, solar-powered bicycles called "Sol Cycles" to use as teaching tools. Traveling by bicycle, Cycle for Science has brought them to rural and urban communities across the U.S. in two major efforts so far: one traversing the country (2015), and one through central California (2017). The program involves (1) introducing the scientists and why they value science, (2) running a skit to demonstrate how electrons and photons interact inside the solar panel, (3) assembling the Sol Cycles, (4) taking students outdoors to test the effects of variables (e.g. light intensity) on the Sol Cycles' movement, (5) and debriefing about the importance of renewable energy. In addition to physics and solar energy, the lessons teach the scientific process, provide tactile engagement with science, and introduce a platform to engage students with climate change impacts. By cycling to classrooms, we provide positive examples of low-impact transportation and a unique avenue for discussing climate action. It was important that this program extend beyond the trips, so the lesson and Sol Cycle design are open source to encourage teachers and students to play, change and improve the design, as well as incorporate new exercises (e.g. could you power the bicycle by wind?). Additionally, it has been permanently added to the XRaise Lending Library at Cornell University, so teachers across the world can implement the lesson. By sharing our project at AGU, we aim to connect with other scientists, educators, and concerned citizens about how to continue to bring renewable energy lessons into classrooms.

  13. ExSTA: External Standard Addition Method for Accurate High-Throughput Quantitation in Targeted Proteomics Experiments.

    Science.gov (United States)

    Mohammed, Yassene; Pan, Jingxi; Zhang, Suping; Han, Jun; Borchers, Christoph H

    2018-03-01

    Targeted proteomics using MRM with stable-isotope-labeled internal-standard (SIS) peptides is the current method of choice for protein quantitation in complex biological matrices. Better quantitation can be achieved with the internal standard-addition method, where successive increments of synthesized natural form (NAT) of the endogenous analyte are added to each sample, a response curve is generated, and the endogenous concentration is determined at the x-intercept. Internal NAT-addition, however, requires multiple analyses of each sample, resulting in increased sample consumption and analysis time. To compare the following three methods, an MRM assay for 34 high-to-moderate abundance human plasma proteins is used: classical internal SIS-addition, internal NAT-addition, and external NAT-addition-generated in buffer using NAT and SIS peptides. Using endogenous-free chicken plasma, the accuracy is also evaluated. The internal NAT-addition outperforms the other two in precision and accuracy. However, the curves derived by internal vs. external NAT-addition differ by only ≈3.8% in slope, providing comparable accuracies and precision with good CV values. While the internal NAT-addition method may be "ideal", this new external NAT-addition can be used to determine the concentration of high-to-moderate abundance endogenous plasma proteins, providing a robust and cost-effective alternative for clinical analyses or other high-throughput applications. © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  14. Attachment behaviour of Escherichia coli K12 and Salmonella Typhimurium P6on food contact surfaces for food transportation

    DEFF Research Database (Denmark)

    Abban, Stephen; Jakobsen, Mogens; Jespersen, Lene

    2012-01-01

    The role of cargo container lining materials aluminium, a fibre reinforced plastic (FRP) and stainless steel in bacterial cross contamination during transport was assessed. For this, attachment and detachment of Escherichia coli K12 and Salmonella Typhimurium P6 on the three surfaces in the absence....... Typhimurium P6 respectively. Correlation with roughness average was poor; r = -0.425 and -0.413 respectively for E. coli K12 and S. Typhimurium P6. Presence of residue caused significant reduction (p ... material sections of the same surfaces. We report these observations for the first time for aluminium and the FRP material and in part for stainless steel. The S. Typhimurium P6 strain also had significantly higher level of attachment than the E. coli K12 strain. Our findings show that food residue...

  15. An Inventory of Methods for the Assessment of Additive Increased Addictiveness of Tobacco Products.

    Science.gov (United States)

    van de Nobelen, Suzanne; Kienhuis, Anne S; Talhout, Reinskje

    2016-07-01

    Cigarettes and other forms of tobacco contain the addictive drug nicotine. Other components, either naturally occurring in tobacco or additives that are intentionally added during the manufacturing process, may add to the addictiveness of tobacco products. As such, these components can make cigarette smokers more easily and heavily dependent.Efforts to regulate tobacco product dependence are emerging globally. Additives that increase tobacco dependence will be prohibited under the new European Tobacco Product Directive. This article provides guidelines and recommendations for developing a regulatory strategy for assessment of increase in tobacco dependence due to additives. Relevant scientific literature is summarized and criteria and experimental studies that can define increased dependence of tobacco products are described. Natural tobacco smoke is a very complex matrix of components, therefore analysis of the contribution of an additive or a combination of additives to the level of dependence on this product is challenging. We propose to combine different type of studies analyzing overall tobacco product dependence potential and the functioning of additives in relation to nicotine. By using a combination of techniques, changes associated with nicotine dependence such as behavioral, physiological, and neurochemical alterations can be examined to provide sufficient information.Research needs and knowledge gaps will be discussed and recommendations will be made to translate current knowledge into legislation. As such, this article aids in implementation of the Tobacco Product Directive, as well as help enable regulators and researchers worldwide to develop standards to reduce dependence on tobacco products. This article provides an overall view on how to assess tobacco product constituents for their potential contribution to use and dependence. It provides guidelines that help enable regulators worldwide to develop standards to reduce dependence on tobacco products

  16. Methods and energy storage devices utilizing electrolytes having surface-smoothing additives

    Science.gov (United States)

    Xu, Wu; Zhang, Jiguang; Graff, Gordon L; Chen, Xilin; Ding, Fei

    2015-11-12

    Electrodeposition and energy storage devices utilizing an electrolyte having a surface-smoothing additive can result in self-healing, instead of self-amplification, of initial protuberant tips that give rise to roughness and/or dendrite formation on the substrate and anode surface. For electrodeposition of a first metal (M1) on a substrate or anode from one or more cations of M1 in an electrolyte solution, the electrolyte solution is characterized by a surface-smoothing additive containing cations of a second metal (M2), wherein cations of M2 have an effective electrochemical reduction potential in the solution lower than that of the cations of M1.

  17. Magnetic resonance tomography - an additive method complementary to ultrasonographic diagnosis of fetal malformations

    International Nuclear Information System (INIS)

    Bloechle, M.; Bollmann, R.; Zienert, A.; Kalache, K.; Koerner, H.; Tennstedt, C.; Ivanow, S.

    1992-01-01

    A case of prenatal sonographic diagnosis of polycystic renal degeneration is reported in this paper. With oligophydramnion established, the extent of the malformation could not be reliable diagnosed by means of sonography. It was also not possible to determine safely whether both kidneys were affected by malformation or if one possibly intact kidney was superimposed by one with dysplasia. In addition, the urinary bladder could not be sonographically delineated with reliability. Magnetic resonance tomography (MRT) was thus performed as an additional modality to complete the fetal diagnosis. The results thus obtained and the role of MRI in prenatal diagnosis and therapy are discussed. (orig.) [de

  18. Effect of administration of Streptococcus salivarius K12 on the occurrence of streptococcal pharyngo-tonsillitis, scarlet fever and acute otitis media in 3 years old children.

    Science.gov (United States)

    Di Pierro, F; Colombo, M; Giuliani, M G; Danza, M L; Basile, I; Bollani, T; Conti, A M; Zanvit, A; Rottoli, A S

    2016-11-01

    Streptococcus salivarius K12 (BLIS K12) is a probiotic strain strongly antagonistic to the growth of Streptococcus pyogenes, the most important bacterial cause of pharyngeal infections in humans. Shown to colonize the oral cavity and to be safe for human use, BLIS K12 has previously been reported to reduce pharyngo-tonsillitis episodes in children or adults known to have experienced recurrent streptococcal infection. The present study was focussed upon evaluating the role of BLIS K12 in the control of streptococcal disease and acute otitis media in children attending the first year of kindergarten. By randomization, 222 enrolled children attending the first year of kindergarten were divided into a treated group (N = 111) receiving for 6 months a daily treatment with BLIS K12 (Bactoblis®) and a control group (N = 111) who were monitored as untreated controls. During the 6 months of treatment and 3 months of follow-up, the children were evaluated for treatment tolerance, and for episodes of streptococcal pharyngo-tonsillitis, scarlet fever and acute otitis media. During the 6-month trial (N = 111 per group) the incidence of streptococcal pharyngo-tonsillitis, scarlet fever and acute otitis media was approximately 16%, 9% and 44% respectively in the treated group and 48%, 4% and 80% in the control group. During the 3-months follow-up (N = 29 per group) the corresponding rates of infection were 15%, 0% and 12% in the treated group and 26%, 6% and 36% in the controls. No apparent side effects were detected in the treated group either during treatment or follow-up. All of the enrolled children completed the study. The daily administration of BLIS K12 to children attending their first year of kindergarten was associated with a significant reduction in episodes of streptococcal pharyngitis and acute otitis media. No protection against scarlet fever was detected.

  19. A novel method to fabricate TiAl intermetallic alloy 3D parts using additive manufacturing

    Directory of Open Access Journals (Sweden)

    J.J.S. Dilip

    2017-04-01

    Full Text Available The present work explores the feasibility of fabricating porous 3D parts in TiAl intermetallic alloy directly from Ti–6Al–4V and Al powders. This approach uses a binder jetting additive manufacturing process followed by reactive sintering. The results demonstrate that the present approach is successful for realizing parts in TiAl intermetallic alloy.

  20. Developing design methods of concrete mix with microsilica additives for road construction

    Science.gov (United States)

    Dmitrienko, Vladimir; Shrivel, Igor; Kokunko, Irina; Pashkova, Olga

    2017-10-01

    Based on the laboratory test results, regression equations having standard cone and concrete strength, to determine the available amount of cement, water and microsilica were obtained. The joint solution of these equations allowed the researchers to develop the algorithm of designing heavy concrete compositions with microsilica additives for road construction.

  1. Financing Energy Upgrades for K-12 School Districts: A Guide to Tapping into Funding for Energy Efficiency and Renewable Energy Improvements

    Energy Technology Data Exchange (ETDEWEB)

    Goggio Borgeson, Merrian [Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Environmental Energy Technologies Division; Zimring, Mark [Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Environmental Energy Technologies Division

    2013-04-01

    This guide focuses on clean energy financing options for school administrators, facility managers, and other K-12 school decision makers who are considering investments in high performance school projects. This guide explicitly focuses on comprehensive energy upgrades, those that involve multiple measures and are targeted toward achieving significant energy savings. Successful implementation of clean energy upgrades in schools is a matter of understanding the opportunity, making the commitment, and creatively tapping into available financing. This guide attempts to provide the foundation needed for successful projects in U.S. schools. It walks through the financing options available to K-12 schools and provides case studies of six school districts from around the country.

  2. Additional Energy Losses from Asymmetric and Non-Sinusoidal Current in an Electrical Facility and Methods of their Reduction

    OpenAIRE

    Tarasov, Evgeny Vladimirovich; Bulyga, Leonid Leonidovich; Ushakov, Vasily Yakovlevich; Kharlov, Nikolay Nikolaevich

    2015-01-01

    Influence of the asymmetry and higher harmonics of current on the operation of an electrical facility is analyzed. The level of additional losses from the asymmetric and non-sinusoidal currents is evaluated for a 110 kV electrical network in the Siberian Region of the Russian Federation. Methods for reducing the additional energy losses in the electrical facility are suggested.

  3. Effect of red mud addition on the corrosion parameters of reinforced concrete evaluated by electrochemical methods

    Directory of Open Access Journals (Sweden)

    D.V. Ribeiro

    Full Text Available Red mud, the main waste generated in aluminum and alumina production from bauxite ore by the Bayer process, is considered "hazardous" due to its high pH. The high pH also provides greater protection of rebars, which is reflected in the low corrosion potential and high electrical resistivity (filler effect of concrete. The corrosion potential was monitored by electrochemical measurements and the electrical resistivity was evaluated using sensors embedded in concrete test specimens. The results showed that the addition of red mud is beneficial to concrete, reducing its corrosion potential and increasing its electrical resistivity. Red mud proved to be a promising additive for concrete to inhibit the corrosion process.

  4. An additive matrix preconditioning method with application for domain decomposition and two-level matrix partitionings

    Czech Academy of Sciences Publication Activity Database

    Axelsson, Owe

    2010-01-01

    Roč. 5910, - (2010), s. 76-83 ISSN 0302-9743. [International Conference on Large-Scale Scientific Computations, LSSC 2009 /7./. Sozopol, 04.06.2009-08.06.2009] R&D Projects: GA AV ČR 1ET400300415 Institutional research plan: CEZ:AV0Z30860518 Keywords : additive matrix * condition number * domain decomposition Subject RIV: BA - General Mathematics www.springerlink.com

  5. The steady-state kinetics of the NADH-dependent nitrite reductase from Escherichia coli K 12. Nitrite and hydroxylamine reduction.

    Science.gov (United States)

    Jackson, R H; Cole, J A; Cornish-Bowden, A

    1981-01-01

    The reduction of both NO2- and hydroxylamine by the NADH-dependent nitrite reductase of Escherichia coli K 12 (EC 1.6.6.4) appears to follow Michaelis-Menten kinetics over a wide range of NADH concentrations. Substrate inhibition can, however, be detected at low concentrations of the product NAD+. In addition, NAD+ displays mixed product inhibition with respect to NADH and mixed or uncompetitive inhibition with respect to hydroxylamine. These inhibition characteristics are consistent with a mechanism in which hydroxylamine binds during catalysis to a different enzyme form from that generated when NAD+ is released. The apparent maximum velocity with NADH as varied substrate increases as the NAD+ concentration increases from 0.05 to 0.7 mM with 1 mM-NO2- or 100 mM-hydroxylamine as oxidized substrate. This increase is more marked for hydroxylamine reduction than for NO2- reduction. Models incorporating only one binding site for NAD can account for the variation in the Michaelis-Menten parameters for both NADH and hydroxylamine with [NAD+] for hydroxylamine reduction. According to these models, activation of the reaction occurs by reversal of an over-reduction of the enzyme by NADH. If the observed activation of the enzyme by NAD+ derives both from activation of the generation of the enzyme-hydroxylamine complex from the enzyme-NO2- complex during NO2- reduction and from activation of the reduction of the enzyme-hydroxylamine complex to form NH4+, then the variation of Vapp. for NO2- or hydroxylamine with [NAD+] is consistent with the occurrence of the same enzyme-hydroxylamine complex as an intermediate in both reactions. PMID:6279095

  6. Efficient method for computing the maximum-likelihood quantum state from measurements with additive Gaussian noise.

    Science.gov (United States)

    Smolin, John A; Gambetta, Jay M; Smith, Graeme

    2012-02-17

    We provide an efficient method for computing the maximum-likelihood mixed quantum state (with density matrix ρ) given a set of measurement outcomes in a complete orthonormal operator basis subject to Gaussian noise. Our method works by first changing basis yielding a candidate density matrix μ which may have nonphysical (negative) eigenvalues, and then finding the nearest physical state under the 2-norm. Our algorithm takes at worst O(d(4)) for the basis change plus O(d(3)) for finding ρ where d is the dimension of the quantum state. In the special case where the measurement basis is strings of Pauli operators, the basis change takes only O(d(3)) as well. The workhorse of the algorithm is a new linear-time method for finding the closest probability distribution (in Euclidean distance) to a set of real numbers summing to one.

  7. A method for the preparation of a fuel, by the addition of one or more components to a base fuel

    NARCIS (Netherlands)

    2013-01-01

    The present invention relates to a method for the preparation of a fuel, by the addition of one or more components to a base fuel, wherein the method comprises the following steps: i) providing a base fuel; ii) withdrawing aromatic components from a styrene / propylene ox ide production plant; iii)

  8. Direct fabrication of bio-inspired gecko-like geometries with vat polymerization additive manufacturing method

    DEFF Research Database (Denmark)

    Davoudinejad, A.; M. Ribo, M.; Pedersen, D. B.

    2018-01-01

    on. The geometry and fabrication of these surfaces are still under research. In this study, the feasibility of using direct fabrication of microscale features by Additive Manufacturing (AM) processes was investigated. The investigation was carried out using a specifically designed vat...... photopolymerization AM machine-tool suitable for precision manufacturing at the micro dimensional scale which has previously been developed, built and validated at the Technical University of Denmark. It was shown that it was possible to replicate a simplified surface inspired by the Tokay gecko, the geometry...

  9. Characterization of additive manufacturing processes for polymer micro parts productions using direct light processing (DLP) method

    DEFF Research Database (Denmark)

    Davoudinejad, Ali; Pedersen, David Bue; Tosello, Guido

    The process capability of additive manufacturing (AM) for direct production of miniaturized polymer components with micro features is analyzed in this work. The consideration of the minimum printable feature size and obtainable tolerances of AM process is a critical step to establish a process...... chains for the production of parts with micro scale features. A specifically designed direct light processing (DLP) AM machine suitable for precision printing has been used. A test part is designed having features with different sizes and aspect ratios in order to evaluate the DLP AM machine capability...

  10. Method of distillation of shale. [addition of water to vertical retort

    Energy Technology Data Exchange (ETDEWEB)

    Hultman, G H

    1915-09-11

    The method is characterized by adding water, finely distributed, to the warm shale being distilled in a vertical retort. By this procedure steam is generated which will drive out and protect the distilled oil vapors. The adding of finely distributed water, already mentioned, takes place in special chambers under the retort.

  11. A new ultrasonic method to detect chemical additives in branded milk

    Indian Academy of Sciences (India)

    Abstract. A new ultrasonic method – thermoacoustic analysis – is reported for the detection of the added chemical preservatives in branded milk. The nature of variation and shift in the thermal response of the acoustic parameters specific acoustic impedance, adiabatic compressibility and Rao's specific sound velocity for ...

  12. A computerized method of estimation of sensor motor reaction, complicated with additional cognitive component

    Directory of Open Access Journals (Sweden)

    Gennadij V. Ganin

    2011-05-01

    Full Text Available This article is related to new integrated approach to objective computerizing evaluation of cognitive-component which delays the latent period of the sensor-motor reaction on specific visual stimuli, which carried different semantic information. It is recommended to use this method for clinical diagnostic of pathologies associated with disorders of cognitive human activity and for assessment of mental fatigue.

  13. The REVEL Project: Long-Term Investment in K-12 Education at a RIDGE 2000 Integrated Study Site

    Science.gov (United States)

    Robigou, V.

    2005-12-01

    The REVEL Project has provided dozens of science teachers from throughout the U.S. an opportunity to explore the links between mid-ocean ridge processes and life along the RIDGE 2000 Juan de Fuca Ridge Integrated Study Site. In turn, these educators have facilitated deep-sea, research-based teaching and learning in hundreds of classrooms, contributed to mid-ocean ridge curriculum and programs development ranging from IMAX movies and museum exhibits to the R2K-SEAS (Student Experiment At Sea) program. In addition, the REVEL educators take on the mission to champion the importance of science in education and to bring ocean sciences into their local and regional communities. For the scientific community, research in an environment as large, dynamic and remote as the ocean intrinsically requires long-term investment to advance the understanding of the interactions between the processes shaping our planet. Similarly, research-based education requires long-term investment to incrementally change the way science is taught in schools, informal settings or even at home. It takes even longer to perceptibly measure the result of new teaching methods on students' learning and the impact of these methods on citizens' scientific literacy. Research-based education involving teachers practicing research in the field, and collaborating with scientists to experience and understand the process of science is still in its infancy - despite 20 years of NSF's efforts in teachers' professional development. This poster reports on strategies that the REVEL Project has designed over 9 years to help teachers that adopt research-based education transform their way of teaching in the classroom and bring cutting-edge, exciting science into schools through rigorous science learning. Their teaching approaches encourage students' interest in science, and engage students in the life-long skills of reasoning and decision making through the practice of science. Evaluation results of how the research

  14. Perceptions of Participating K-12 Educational Leaders' Experiences and Decisions Regarding the Crisis Caused by the April 27, 2011 Tornadoes in Rural Alabama

    Science.gov (United States)

    Bishop, William E., Jr.

    2013-01-01

    April 27, 2011, will be remembered by many as a catastrophic day and event in Alabama, and specifically by K-12 educational leaders. Natural disasters like tornadoes have a significant impact on leaders, on their decision making and, obviously, on the survival of many of their victims. The possibility and threat of a major crisis caused by natural…

  15. A Study of the Relationship of Perceived Principal Supervision and Support to the Perceived Self-Efficacy of Beginning and Experienced K-12 Teachers

    Science.gov (United States)

    Spearing, Leonard M.

    2013-01-01

    In this quantitative study the author examined the relationship between the perceived level of principal supervision and support to the perceived self-efficacy of K-12 teachers in a suburban public school district. The impact of perceived self-efficacy upon the commitment to remain in teaching was also considered. Finally the differential…

  16. Assessing the Impact of a K-12 Engagement Program on Graduate Learning Outcomes for Communicating with Diverse Audiences, Pedagogy, and Community Engagement

    Science.gov (United States)

    Weeks, Faith; Harbor, Jon

    2014-01-01

    A large midwestern university has developed a program that places graduate students in middle school classrooms to enhance the graduate students' communication skills with diverse audiences, develop pedagogical knowledge, and provide a foundation for effective future K-12 engagement. After observing and co-teaching, participants develop and…

  17. The State of Wiki Usage in U.S. K-12 Schools: Leveraging Web 2.0 Data Warehouses to Study Quality and Equality in Online Learning Environments

    Science.gov (United States)

    Reich, Blair Justin Fire

    2012-01-01

    In the first part of this dissertation, I document wiki usage in U.S. K-12 settings by analyzing data on a representative sample drawn from a population of nearly 180,000 wikis. My research group, which I lead and managed, measured the opportunities wikis provide for students to develop 21st century skills such as expert thinking, complex…

  18. The State of Wiki Usage in U.S. K-12 Schools: Leveraging Web 2.0 Data Warehouses to Assess Quality and Equity in Online Learning Environments

    Science.gov (United States)

    Reich, Justin; Murnane, Richard; Willett, John

    2012-01-01

    To document wiki usage in U.S. K-12 settings, this study examined a representative sample drawn from a population of nearly 180,000 wikis. The authors measured the opportunities wikis provide for students to develop 21st-century skills such as expert thinking, complex communication, and new media literacy. The authors found four types of wiki…

  19. An Invaluable Resource for Supporting Transgender, Transsexual, and Gender-Nonconforming Students in School Communities: A Review of "Supporting Transgender and Transsexual Students in K-12 Schools"

    Science.gov (United States)

    Martino, Wayne

    2013-01-01

    This essay provides a review of a resource guide written by Kristopher Wells, Gayle Roberts, and Carol Allan (2012) titled "Supporting Transgender and Transsexual Students in K-12 Schools: A Guide for Educators". The guide is an invaluable resource for educators in schools and teacher education programs.

  20. The Relationship between per Pupil Expenditure in Maricopa County K-12 Public School Districts and Student Preparedness at the Post-Secondary Level

    Science.gov (United States)

    Lamperez, Edmond Allen, Jr.; Dereshiwsky, Mary

    2016-01-01

    Student under preparedness is one of the major challenges facing community colleges in the United States. A contributing factor of student under preparedness at the postsecondary level is an inequitable and inadequate distribution of resources at the K-12 level. Students residing in socio-economically disadvantaged school districts that often…