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Feeney C, Chandler M, Platt A, Sun S, Setji N, Ming DY. Impact of a hospital service for adults with chronic childhood-onset disease: A propensity weighted analysis. J Hosp Med 2023; 18:1082-1091. [PMID: 37933708 DOI: 10.1002/jhm.13234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/19/2023] [Revised: 10/10/2023] [Accepted: 10/19/2023] [Indexed: 11/08/2023]
Abstract
BACKGROUND Young adults with chronic childhood-onset diseases (CCOD) transitioning care from pediatrics to adult care are at high risk for readmission after hospital discharge. At our institution, we have implemented an inpatient service, the Med-Peds (MP) line, to improve transitions to adult care and reduce hospital utilization by young adults with CCOD. OBJECTIVE This study aimed to assess the effect of the MP line on length of stay (LOS) and 30-day readmission rates compared to other inpatient services. METHODS This was an observational, retrospective cohort analysis of patients admitted to the MP line compared to other hospital service lines over a 2-year period. To avoid potential confounding by indication for admission to the MP line, propensity score weighting methods were used. RESULTS The MP line cared for 302 patients with CCOD from June 2019 to July 2021. Compared to other service lines, there was a 33% reduction in relative risk of 30-day readmission (26.9% compared to 40.3%, risk ratio = 0.67, 95% confidence interval [CI] 0.55-0.81). LOS was 10% longer for the MP line (event time ratio (ETR): 1.10 95% CI 1.0-1.21) with median LOS 4.8 versus 4.5 days. Patients with sickle cell disease had less of a reduction in 30-day readmissions and longer LOS. CONCLUSION Hospitalization for young adults with CCOD on a MP service line was associated with lower 30-day readmission rates and longer LOS than hospitalization on other services. Further research is needed to assess which components of the line most contribute to decreased utilization.
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Affiliation(s)
- Colby Feeney
- Department of Medicine, Duke University School of Medicine, Durham, North Carolina, USA
- Department of Pediatrics, Duke University School of Medicine, Durham, North Carolina, USA
| | - Mark Chandler
- Department of Medicine, Duke University School of Medicine, Durham, North Carolina, USA
- Department of Pediatrics, Duke University School of Medicine, Durham, North Carolina, USA
| | - Alyssa Platt
- Department of Biostatistics and Bioinformatics, Duke University, Durham, North Carolina, USA
| | - Shifeng Sun
- Department of Biostatistics and Bioinformatics, Duke University, Durham, North Carolina, USA
| | - Noppon Setji
- Department of Medicine, Duke University School of Medicine, Durham, North Carolina, USA
| | - David Y Ming
- Department of Medicine, Duke University School of Medicine, Durham, North Carolina, USA
- Department of Pediatrics, Duke University School of Medicine, Durham, North Carolina, USA
- Department of Population Health Sciences, Duke University School of Medicine, Durham, North Carolina, USA
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Reyes R, Abou-Dahech MS, Nguyen G, Smith A, Devore Homan RC, Schiefer IT, Chandler M, Baki G. Skin penetration of caffeine from commercial eye creams and eye creams designed and optimized based on Hansen Solubility Parameters. Int J Pharm 2023; 639:122973. [PMID: 37084834 DOI: 10.1016/j.ijpharm.2023.122973] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Revised: 03/31/2023] [Accepted: 04/16/2023] [Indexed: 04/23/2023]
Abstract
Computer-aided formulation design can streamline and speed up product development. In this study, ingredient screening and optimizing software, Formulating for Efficacy® (FFE), was used to design and optimize creams for the topical delivery of caffeine. FFE was set up to optimize lipophilic active ingredients, therefore, this study challenged the program's capabilities. The effect of two chemical penetration enhancers, including dimethyl isosorbide (DMI) and ethoxydiglycol (EDG), were studied based on their favorable Hansen Solubility Parameter physicochemical input parameters for the skin delivery of caffeine in the FFE® software application. Four oil-in-water emulsions containing 2% caffeine were formulated, one without a chemical penetration enhancer, one with five percent of DMI, one with five percent of EDG, and one with 2.5% of DMI and EDG each (DMI+EDG). Additionally, three commercial products were used as reference products. The cumulative amount of caffeine released and permeated, and the flux across Strat-M® membranes were determined using Franz diffusion cells. The eye creams had skin-compatible pH, excellent spreadability for the application area, were opaque emulsions with 14-17 μm droplet size, and were stable at 25 °C for 6 months. All four eye creams formulated released over 85% of caffeine in 24 hours, outperforming the commercial products. DMI+EDG cream provided the highest permeation in vitro in 24 hours, which was significantly higher than the commercial products (p < 0.05). FFE proved to be a valuable and quick tool to aid in the topical delivery of caffeine.
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Affiliation(s)
- Roanne Reyes
- The University of Toledo, College of Pharmacy and Pharmaceutical Sciences, Department of Pharmacy Practice, 3000 Arlington Ave, Toledo, OH 43614, United States
| | - Mariam S Abou-Dahech
- The University of Toledo, College of Pharmacy and Pharmaceutical Sciences, Department of Pharmacy Practice, 3000 Arlington Ave, Toledo, OH 43614, United States
| | - Gina Nguyen
- The University of Toledo, College of Pharmacy and Pharmaceutical Sciences, Department of Pharmacy Practice, 3000 Arlington Ave, Toledo, OH 43614, United States
| | - Amber Smith
- The University of Toledo, College of Pharmacy and Pharmaceutical Sciences, Department of Pharmacy Practice, 3000 Arlington Ave, Toledo, OH 43614, United States
| | - Ryan C Devore Homan
- The University of Toledo, College of Pharmacy and Pharmaceutical Sciences, Department of Medicinal and Biological Chemistry, 3000 Arlington Ave, Toledo, OH 43614, United States
| | - Isaac T Schiefer
- The University of Toledo, College of Pharmacy and Pharmaceutical Sciences, Department of Medicinal and Biological Chemistry, 3000 Arlington Ave, Toledo, OH 43614, United States
| | - Mark Chandler
- ACT Solutions Corp, 550 S. College Ave., Suite 110, Newark, DE 19713, United States
| | - Gabriella Baki
- The University of Toledo, College of Pharmacy and Pharmaceutical Sciences, Department of Pharmacy Practice, 3000 Arlington Ave, Toledo, OH 43614, United States.
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Ibsen PC, Santiago LS, Shiflett SA, Chandler M, Jenerette GD. Irrigated urban trees exhibit greater functional trait plasticity compared to natural stands. Biol Lett 2023; 19:20220448. [PMID: 36596464 PMCID: PMC9810417 DOI: 10.1098/rsbl.2022.0448] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Urbanization creates novel ecosystems comprised of species assemblages and environments with no natural analogue. Moreover, irrigation can alter plant function compared to non-irrigated systems. However, the capacity of irrigation to alter functional trait patterns across multiple species is unknown but may be important for the dynamics of urban ecosystems. We evaluated the hypothesis that urban irrigation influences plasticity in functional traits by measuring carbon-gain and water-use traits of 30 tree species planted in Southern California, USA spanning a coastal-to-desert gradient. Tree species respond to irrigation through increasing the carbon-gain trait relationship of leaf nitrogen per specific leaf area compared to their native habitat. Moreover, most species shift to a water-use strategy of greater water loss through stomata when planted in irrigated desert-like environments compared to coastal environments, implying that irrigated species capitalize on increased water availability to cool their leaves in extreme heat and high evaporative demand conditions. Therefore, irrigated urban environments increase the plasticity of trait responses compared to native ecosystems, allowing for novel response to climatic variation. Our results indicate that trees grown in water-resource-rich urban ecosystems can alter their functional traits plasticity beyond those measured in native ecosystems, which can lead to plant trait dynamics with no natural analogue.
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Affiliation(s)
- Peter C. Ibsen
- Department of Botany and Plant Sciences, University of California Riverside, Riverside, CA 92521, USA,Geosciences and Environmental Change Science Center, United States Geological Survey, Denver, CO 80225, USA
| | - Louis S. Santiago
- Department of Botany and Plant Sciences, University of California Riverside, Riverside, CA 92521, USA
| | - Sheri A. Shiflett
- Department of Environmental Sciences, University of North Carolina Wilmington, Wilmington, NC 28403, USA
| | | | - G. Darrel Jenerette
- Department of Botany and Plant Sciences, University of California Riverside, Riverside, CA 92521, USA
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Callaghan CT, Mesaglio T, Ascher JS, Brooks TM, Cabras AA, Chandler M, Cornwell WK, Cristóbal Ríos-Málaver I, Dankowicz E, Urfi Dhiya’ulhaq N, Fuller RA, Galindo-Leal C, Grattarola F, Hewitt S, Higgins L, Hitchcock C, James Hung KL, Iwane T, Kahumbu P, Kendrick R, Kieschnick SR, Kunz G, Lee CC, Lin CT, Loarie S, Norman Medina M, McGrouther MA, Miles L, Modi S, Nowak K, Oktaviani R, Waswala Olewe BM, Pagé J, Petrovan S, saari C, Seltzer CE, Seregin AP, Sullivan JJ, Sumanapala AP, Takoukam A, Widness J, Willmott K, Wüster W, Young AN. The benefits of contributing to the citizen science platform iNaturalist as an identifier. PLoS Biol 2022; 20:e3001843. [PMID: 36355752 PMCID: PMC9648699 DOI: 10.1371/journal.pbio.3001843] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
As the number of observations submitted to the citizen science platform iNaturalist continues to grow, it is increasingly important that these observations can be identified to the finest taxonomic level, maximizing their value for biodiversity research. Here, we explore the benefits of acting as an identifier on iNaturalist.
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Affiliation(s)
- Corey T. Callaghan
- German Centre for Integrative Biodiversity Research (iDiv) Halle—Jena—Leipzig, Leipzig, Germany
- Institute of Biology, Martin Luther University Halle—Wittenberg, Halle (Saale), Germany
- * E-mail: (CTC); (TM)
| | - Thomas Mesaglio
- Centre for Ecosystem Science; School of Biological, Earth and Environmental Sciences; UNSW Sydney; Sydney, Australia
- Evolution & Ecology Research Centre; School of Biological, Earth and Environmental Sciences; UNSW Sydney; Sydney, Australia
- * E-mail: (CTC); (TM)
| | - John S. Ascher
- Department of Biological Sciences, National University of Singapore, Singapore, Singapore
| | - Thomas M. Brooks
- International Union for Conservation of Nature (IUCN), Gland, Switzerland
- World Agroforestry Center (ICRAF), University of the Philippines, Los Baños, Philippines
- Institute for Marine & Antarctic Studies, University of Tasmania, Hobart, Tasmania, Australia
| | - Analyn A. Cabras
- Coleoptera Research Center, Institute of Biodiversity and Environment, University of Mindanao, Davao City, Philippines
| | - Mark Chandler
- Earthwatch Institute, Boston, Massachusetts, United States of America
| | - William K. Cornwell
- Evolution & Ecology Research Centre; School of Biological, Earth and Environmental Sciences; UNSW Sydney; Sydney, Australia
| | - Indiana Cristóbal Ríos-Málaver
- McGuire Center for Lepidoptera and Biodiversity, Florida Museum of Natural History, University of Florida, Gainesville, Florida, United States of America
- Instituto de Investigaciones de Recursos Biológicos Alexander von Humboldt, Claustro de San Agustín, Villa de Leyva, Boyaca, Colombia
| | - Even Dankowicz
- Biology Department; Brandeis University; Waltham, Massachusetts, United States of America
| | | | - Richard A. Fuller
- School of Biological Sciences, The University of Queensland, Brisbane, Queensland, Australia
| | - Carlos Galindo-Leal
- Comisión Nacional para el Conocimiento y Uso de la Biodiversidad: Ciudad de Mexico, Ciudad de México, Mexico
| | - Florencia Grattarola
- Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Praha, Czech Republic
| | - Susan Hewitt
- Independent Researcher, New York, New York, United States of America
| | - Lila Higgins
- Natural History Museum of Los Angeles County, Los Angeles, California, United States of America
| | - Colleen Hitchcock
- Biology Department; Brandeis University; Waltham, Massachusetts, United States of America
| | - Keng-Lou James Hung
- Oklahoma Biological Survey, University of Oklahoma, Norman, Oklahoma, United States of America
| | - Tony Iwane
- iNaturalist, California Academy of Sciences, San Francisco, California, United States of America
| | | | | | - Samuel R. Kieschnick
- Urban Wildlife Biologist, Texas Parks and Wildlife Department, Dallas, Texas, United States of America
| | - Gernot Kunz
- Karl Franzens University of Graz, Universitätsplatz 2, Department of Biology, Graz, Austria
| | - Chien C. Lee
- Institute of Biodiversity and Environmental Conservation, Universiti Malaysia Sarawak, Kota Samarahan, Sarawak, Malaysia
| | - Cheng-Tao Lin
- Department of Biological Resources, National Chiayi University, Chiayi, Taiwan
| | - Scott Loarie
- iNaturalist, California Academy of Sciences, San Francisco, California, United States of America
| | - Milton Norman Medina
- Coleoptera Research Center, Institute of Biodiversity and Environment, University of Mindanao, Davao City, Philippines
| | - Mark A. McGrouther
- Senior Fellow, Australian Museum Research Institute, Australian Museum, Sydney, New South Wales, Australia
| | - Lera Miles
- UN Environment Programme World Conservation Monitoring Centre (UNEP-WCMC), Cambridge, United Kingdom
| | - Shaunak Modi
- Coastal Conservation Foundation, Matunga West, Mumbai, Maharashtra, India
| | - Katarzyna Nowak
- Faculty of Biology, University of Warsaw, Białowieża Geobotanical Station, Białowieża, Poland
| | - Rahayu Oktaviani
- Yayasan Konservasi Ekosistem Alam Nusantara (KIARA), West Java, Indonesia
| | - Brian M. Waswala Olewe
- Maasai Mara University, Narok, Kenya
- Baruk Yadiym Ecosphere, Nairobi, Kenya
- Kenya National Commission for UNESCO, Nairobi, Kenya
| | - James Pagé
- Canadian Wildlife Federation, Kanata, Ontario, Canada
| | - Silviu Petrovan
- Conservation Science Group, Department of Zoology, University of Cambridge, Cambridge, United Kingdom
| | - cassi saari
- Chicago Park District, Chicago, Illinois, United States of America
| | - Carrie E. Seltzer
- iNaturalist, California Academy of Sciences, San Francisco, California, United States of America
| | | | - Jon J. Sullivan
- Department of Pest-Management and Conservation, Lincoln University, New Zealand
| | - Amila P. Sumanapala
- Department of Zoology and Environment Sciences, University of Colombo, Sri Lanka
| | - Aristide Takoukam
- African Marine Mammal Conservation Organization (AMMCO), Kassala-Beach, Dizangue, Littoral, Cameroon
| | - Jane Widness
- Yale University Department of Anthropology, New Haven, Connecticut, United States of America
| | - Keith Willmott
- McGuire Center for Lepidoptera and Biodiversity, Florida Museum of Natural History, University of Florida, Gainesville, Florida, United States of America
| | - Wolfgang Wüster
- Molecular Ecology and Fisheries Genetics Laboratory, School of Natural Sciences, Bangor University, Bangor, United Kingdom
| | - Alison N. Young
- California Academy of Sciences, San Francisco, California, United States of America
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Wang J, Castro‐Garcia L, Jenerette GD, Chandler M, Ge C, Kucera D, Koutzoukis S, Zeng J. Resolving and Predicting Neighborhood Vulnerability to Urban Heat and Air Pollution: Insights From a Pilot Project of Community Science. Geohealth 2022; 6:e2021GH000575. [PMID: 35509494 PMCID: PMC9055464 DOI: 10.1029/2021gh000575] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Revised: 02/14/2022] [Accepted: 03/13/2022] [Indexed: 06/14/2023]
Abstract
Urban heat and air pollution, two environmental threats to urban residents, are studied via a community science project in Los Angeles, CA, USA. The data collected, for the first time, by community members, reveal the significance of both the large spatiotemporal variations of and the covariations between 2 m air temperature (2mT) and ozone (O3) concentration within the (4 km) neighborhood scale. This neighborhood variation was not exhibited in either daily satellite observations or operational model predictions, which makes the assessment of community health risks a challenge. Overall, the 2mT is much better predicted than O3 by the weather and research forecast model with atmospheric chemistry (WRF-Chem). For O3, diurnal variation is better predicted by WRF-Chem than spatial variation (i.e., underestimated by 50%). However, both WRF-chem and the surface observation show the overall consistency in describing statistically significant covariations between O3 and 2mT. In contrast, satellite-based land surface temperature at 1 km resolution is insufficient to capture air temperature variations at the neighborhood scale. Community engagement is augmented with interactive maps and apps that show the predictions in near real time and reveals the potential of green canopy to reduce air temperature and ozone; but different tree types and sizes may lead to different impacts on air temperature, which is not resolved by the WRF-Chem. These findings highlight the need for community science engagement to reveal otherwise impossible insights for models, observations, and real-time dissemination to understand, predict, and ultimately mitigate, urban neighborhood vulnerability to heat and air pollution.
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Affiliation(s)
- Jun Wang
- Center for Global & Regional Environmental Research and Iowa Technology InstituteThe University of IowaIowa CityIAUSA
- Department of Chemical and Biochemical EngineeringDepartment of Physics and AstronomyThe University of IowaIowa CityIAUSA
| | - Lorena Castro‐Garcia
- Center for Global & Regional Environmental Research and Iowa Technology InstituteThe University of IowaIowa CityIAUSA
| | - G. Darrel Jenerette
- Department of Botany and Plant SciencesUniversity of CaliforniaRiversideCAUSA
| | | | - Cui Ge
- Center for Global & Regional Environmental Research and Iowa Technology InstituteThe University of IowaIowa CityIAUSA
| | - Dion Kucera
- Department of Botany and Plant SciencesUniversity of CaliforniaRiversideCAUSA
| | - Sofia Koutzoukis
- Department of Botany and Plant SciencesUniversity of CaliforniaRiversideCAUSA
| | - Jing Zeng
- Center for Global & Regional Environmental Research and Iowa Technology InstituteThe University of IowaIowa CityIAUSA
- Department of Chemical and Biochemical EngineeringDepartment of Physics and AstronomyThe University of IowaIowa CityIAUSA
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Niemiec B, Gawor J, Nemec A, Clarke D, McLeod K, Tutt C, Gioso M, Steagall PV, Chandler M, Morgenegg G, Jouppi R. World Small Animal Veterinary Association Global Dental Guidelines. J Small Anim Pract 2020; 61:E36-E161. [PMID: 32715504 DOI: 10.1111/jsap.13132] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Dental, oral, and maxillofacial diseases are some of the most common problems in small animal veterinary practice. These conditions create significant pain as well as localized and potentially systemic infection. As such, the World Small Animal Veterinary Association (WSAVA) believes that un- and under treated oral and dental diseases pose a significant animal welfare concern. Dentistry is an area of veterinary medicine which is still widely ignored and is subject to many myths and misconceptions. Effective teaching of veterinary dentistry in the veterinary school is the key to progression in this field of veterinary medicine, and to the improvement of welfare for all our patients globally. These guidelines were developed to provide veterinarians with the information required to understand best practices for dental therapy and create realistic minimum standards of care. Using the three-tiered continuing education system of WSAVA, the guidelines make global equipment and therapeutic recommendations and highlight the anaesthetic and welfare requirements for small animal patients. This document contains information on common oral and dental pathologies, diagnostic procedures (an easily implementable and repeatable scoring system for dental health, dental radiography and radiology) and treatments (periodontal therapy, extractions). Further, there are sections on anaesthesia and pain management for dental procedures, home dental care, nutritional information, and recommendations on the role of the universities in improving veterinary dentistry. A discussion of the deleterious effects of anaesthesia free dentistry (AFD) is included, as this procedure is ineffective at best and damaging at worst. Throughout the document the negative effects of undiagnosed and/or treated dental disease on the health and well-being of our patients, and how this equates to an animal welfare issue, is discussed.
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Niemiec B, Gawor J, Nemec A, Clarke D, McLeod K, Tutt C, Gioso M, Steagall PV, Chandler M, Morgenegg G, Jouppi R, McLeod K. World Small Animal Veterinary Association Global Dental Guidelines. J Small Anim Pract 2020; 61:395-403. [DOI: 10.1111/jsap.13113] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2019] [Revised: 12/17/2019] [Accepted: 12/19/2019] [Indexed: 12/26/2022]
Affiliation(s)
- B. Niemiec
- Veterinary Dental Specialties & Oral Surgery San Diego CA USA
| | - J. Gawor
- Klinika Weterynaryjna Arka Kraków Poland
| | - A. Nemec
- Veterinary Faculty, Small Animal Clinic, University of LjubljanaLjubljanaSlovenia
| | - D. Clarke
- David Clarke Dental Care for Pets MelbourneAustralia
| | - K. McLeod
- The Veterinary Dentist Cape Town South Africa
| | - C. Tutt
- The Veterinary Dentist Cape Town South Africa
| | - M. Gioso
- Department of SurgeryUniversity of São Paulo São Paulo Brazil
| | - P. V. Steagall
- Department of Clinical Sciences, Faculty of Veterinary MedicineUniversité de Montréal Saint‐Hyacinthe QC Canada
| | | | | | - R. Jouppi
- Laurentian University Sudbury ON Canada
| | - K. McLeod
- Conundrum Consulting Toronto ON Canada
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Petrinec SM, Burch JL, Chandler M, Farrugia CJ, Fuselier SA, Giles BL, Gomez RG, Mukherjee J, Paterson WR, Russell CT, Sibeck DG, Strangeway RJ, Torbert RB, Trattner KJ, Vines SK, Zhao C. Characteristics of Minor Ions and Electrons in Flux Transfer Events Observed by the Magnetospheric Multiscale Mission. J Geophys Res Space Phys 2020; 125:e2020JA027778. [PMID: 32999806 PMCID: PMC7507212 DOI: 10.1029/2020ja027778] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Revised: 03/18/2020] [Accepted: 04/15/2020] [Indexed: 06/11/2023]
Abstract
In this study, the ion composition of flux transfer events (FTEs) observed within the magnetosheath proper is examined. These FTEs were observed just upstream of the Earth's postnoon magnetopause by the National Aeronautics and Space Administration (NASA) Magnetospheric Multiscale (MMS) spacecraft constellation. The minor ion characteristics are described using energy spectrograms, flux distributions, and ion moments as the constellation encountered each FTE. In conjunction with electron data and magnetic field observations, such observations provide important contextual information on the formation, topologies, and evolution of FTEs. In particular, minor ions, when combined with the field-aligned streaming of electrons, are reliable indicators of FTE topology. The observations are also placed (i) in context of the solar wind magnetic field configuration, (ii) the connection of the sampled flux tube to the ionosphere, and (iii) the location relative to the modeled reconnection line at the magnetopause. While protons and alpha particles were often depleted within the FTEs relative to the surrounding magnetosheath plasma, the He+ and O+ populations showed clear enhancements either near the center or near the edges of the FTE, and the bulk plasma flow directions are consistent with magnetic reconnection northward of the spacecraft and convection from the dayside toward the flank magnetopause.
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Affiliation(s)
- S. M. Petrinec
- Lockheed Martin Advanced Technology CenterPalo AltoCAUSA
| | - J. L. Burch
- Southwest Research InstituteSan AntonioTXUSA
| | - M. Chandler
- NASA Marshall Space Flight CenterHuntsvilleALUSA
| | - C. J. Farrugia
- Space Science CenterUniversity of New HampshireDurhamNHUSA
| | - S. A. Fuselier
- Southwest Research InstituteSan AntonioTXUSA
- Department of Physics and AstronomyUniversity of Texas at San AntonioSan AntonioTXUSA
| | - B. L. Giles
- NASA Goddard Space Flight CenterGreenbeltMDUSA
| | - R. G. Gomez
- Southwest Research InstituteSan AntonioTXUSA
- Department of Physics and AstronomyUniversity of Texas at San AntonioSan AntonioTXUSA
| | | | | | - C. T. Russell
- Earth and Space SciencesUniversity of CaliforniaLos AngelesCAUSA
| | | | - R. J. Strangeway
- Earth and Space SciencesUniversity of CaliforniaLos AngelesCAUSA
| | - R. B. Torbert
- Space Science CenterUniversity of New HampshireDurhamNHUSA
| | - K. J. Trattner
- Laboratory for Atmospheric and Space PhysicsUniversity of Colorado BoulderBoulderCOUSA
| | - S. K. Vines
- The Johns Hopkins University Applied Physics LaboratoryLaurelMDUSA
| | - C. Zhao
- Earth and Space SciencesUniversity of CaliforniaLos AngelesCAUSA
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Huynh A, Maktabi B, Reddy CM, O’Neil GW, Chandler M, Baki G. Evaluation of alkenones, a renewably sourced, plant‐derived wax as a structuring agent for lipsticks. Int J Cosmet Sci 2020; 42:146-155. [PMID: 31880361 PMCID: PMC9291794 DOI: 10.1111/ics.12597] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Revised: 11/18/2019] [Accepted: 12/17/2019] [Indexed: 12/01/2022]
Abstract
OBJECTIVE Waxes are used as structuring agents in lipsticks. There are a variety of waxes combined in a single lipstick to provide good stability, pleasant texture and good pay‐off. Due to a significant growth for natural, green and sustainable products, there is a constant search for alternatives to animal‐derived and petroleum‐derived ingredients. In this study, a green, non‐animalderived wax, namely long‐chain ketones (referred to as alkenones), sourced from marine microalgae was formulated into lipsticks and evaluated as a structuring agent. METHODS Alkenones were used as a substitute for microcrystalline wax, ozokerite and candelilla wax, typical structuring agents. In total, 384 lipsticks were formulated: L1 (control, no alkenones), L2 (alkenones as a substitute for ozokerite), L3 (alkenones as a substitute for microcrystalline wax) and L4 (alkenones as a substitute for candelilla wax). Products were tested for hardness (bending force), stiffness, firmness (needle penetration), pay‐off (using a texture analyser and a consumer panel), friction, melting point and stability for 12 weeks at 25 and 45°C. RESULTS Alkenones influenced each characteristic evaluated. In general, lipsticks with alkenones (L2‐L4) became softer and easier to bend compared to the control (L1). In terms of firmness, lipsticks were similar to the control, except for L4, which was significantly (P < 0.05) firmer. The effect on pay‐off was not consistent. L2 and L3 had higher pay‐off to skin and fabric than L1. In addition, L4 had the lowest amount transferred, but it still had the highest colour intensity on skin. Alkenones influenced friction (glide) positively; the average friction decreased for L2‐L4. The lowest friction (i.e. best glide) was shown in L4. Melting point of the lipsticks was lower when alkenones were present. Overall, L4, containing 7% of 4 alkenones in combination with microcrystalline wax, ozokerite and carnauba wax, was found to have the most desirable attributes, including ease of bending, high level of firmness, low pay‐off in terms of amount, high colour intensity on skin and low friction (i.e. better glide). Consumers preferred L4 the most overall. CONCLUSION Results of this study indicate that alkenones offer a sustainable, non‐animal and non‐petroleum‐derived choice as a structuring agent for lipsticks.
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Affiliation(s)
- An Huynh
- Department of Pharmacy Practice College of Pharmacy and Pharmaceutical Sciences University of Toledo Toledo OH USA
| | - Briana Maktabi
- Department of Pharmacy Practice College of Pharmacy and Pharmaceutical Sciences University of Toledo Toledo OH USA
| | - Christopher M. Reddy
- Department of Marine Chemistry and Geochemistry Woods Hole Oceanographic Institution Woods Hole MA USA
| | - Gregory W. O’Neil
- Department of Chemistry Western Washington University Bellingham WA USA
| | | | - Gabriella Baki
- Department of Pharmacy Practice College of Pharmacy and Pharmaceutical Sciences University of Toledo Toledo OH USA
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Haq A, Chandler M, Michniak-Kohn B. Solubility-physicochemical-thermodynamic theory of penetration enhancer mechanism of action. Int J Pharm 2020; 575:118920. [DOI: 10.1016/j.ijpharm.2019.118920] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Revised: 11/24/2019] [Accepted: 11/28/2019] [Indexed: 10/25/2022]
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11
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Abou-Dahech M, Schaefer A, Lam-Phaure L, Huynh AN, Chandler M, Baki G. Effect of Solvents on the In Vitro Sun Protection Factor and Broad-Spectrum Protection of Three Organic UV Filters. J Cosmet Sci 2020; 71:149-165. [PMID: 33022210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Solvents play an essential role in the performance of ultraviolet (UV) filters. The goal of this study was to understand how the in vitro sun protection factor (SPF) and broad-spectrum protection of three organic UV filters (homosalate, ethylhexyl salicylate, and butyl methoxydibenzoylmethane) and a combination of these are influenced by solvents. Twenty-four solvents were selected based on the ingredient active gap for testing. Mixtures of UV filters and solvents were formulated, and in vitro SPF, wavelength of maximum absorbance, broad-spectrum protection, and spreadability were evaluated. Results indicate that in vitro SPF of organic sunscreens can be significantly enhanced by solvents. Relying on solubility data only was not found to be a good approach in this study. The most efficient solvents shared multiple similar structural characteristics, including ester bonds, conjugated structure, aromatic rings, and -CN groups; however, the absence of some of these structural elements did not necessarily prevent a solvent from being a booster. The wavelength of maximum absorbance was significantly shifted in the UVA range by most solvents, whereas minimal or no shift was observed in the UVB range. Results of this study provide practical information that can guide sunscreen formulators in selecting solvents for UV filters and making more effective sunscreens.
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Affiliation(s)
- Mariam Abou-Dahech
- Department of Pharmacy Practice, College of Pharmacy and Pharmaceutical Sciences, University of Toledo, Toledo, OH 43614 (M.A., A.S., L.L.-P., A.H.,G.B.), ACT Solutions Corp, Newark, DE 19713 (M.C.)
| | - Allison Schaefer
- Department of Pharmacy Practice, College of Pharmacy and Pharmaceutical Sciences, University of Toledo, Toledo, OH 43614 (M.A., A.S., L.L.-P., A.H.,G.B.), ACT Solutions Corp, Newark, DE 19713 (M.C.)
| | - Laura Lam-Phaure
- Department of Pharmacy Practice, College of Pharmacy and Pharmaceutical Sciences, University of Toledo, Toledo, OH 43614 (M.A., A.S., L.L.-P., A.H.,G.B.), ACT Solutions Corp, Newark, DE 19713 (M.C.)
| | - A N Huynh
- Department of Pharmacy Practice, College of Pharmacy and Pharmaceutical Sciences, University of Toledo, Toledo, OH 43614 (M.A., A.S., L.L.-P., A.H.,G.B.), ACT Solutions Corp, Newark, DE 19713 (M.C.)
| | - Mark Chandler
- Department of Pharmacy Practice, College of Pharmacy and Pharmaceutical Sciences, University of Toledo, Toledo, OH 43614 (M.A., A.S., L.L.-P., A.H.,G.B.), ACT Solutions Corp, Newark, DE 19713 (M.C.)
| | - Gabriella Baki
- Department of Pharmacy Practice, College of Pharmacy and Pharmaceutical Sciences, University of Toledo, Toledo, OH 43614 (M.A., A.S., L.L.-P., A.H.,G.B.), ACT Solutions Corp, Newark, DE 19713 (M.C.)
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Amofa PA, Locke DEC, Chandler M, Crook JE, Ball CT, Phatak V, Smith GE. Comparative Effectiveness of Behavioral Interventions to Prevent or Delay Dementia: One-Year Partner Outcomes. J Prev Alzheimers Dis 2020; 8:33-40. [PMID: 33336222 DOI: 10.14283/jpad.2020.59] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
BACKGROUND/OBJECTIVE Various behavioral interventions are recommended to combat the distress experienced by caregivers of those with cognitive decline, but their comparative effectiveness is poorly understood. DESIGN/SETTING Caregivers in a comparative intervention study randomly had 1 of 5 possible interventions suppressed while receiving the other four. Caregivers in a full clinical program received all 5 intervention components. Care partner outcomes in the study group were compared to participants enrolled in a full clinical program. PARTICIPANTS Two hundred and seventy-two dyads of persons with amnestic mild cognitive impairment (pwMCI) and care partners enrolled in the comparative intervention study. 265 dyads participated in the full clinical program. INTERVENTION Behavioral intervention components included: memory compensation training, computerized cognitive training, yoga, support group, and wellness education. Each was administered for 10 sessions over 2 weeks. MEASUREMENTS A longitudinal mixed-effect regression model was used to analyze the effects of the interventions on partner burden, quality of life (QoL), mood, anxiety, and self-efficacy at 12 months follow-up. RESULTS At 12 months, withholding wellness education or yoga had a significantly negative impact on partner anxiety compared to partners in the clinical program (ES=0.55 and 0.44, respectively). Although not statistically significant, withholding yoga had a negative impact on partner burden and mood compared to partners in the full clinical program (ES=0.32 and 0.36, respectively). CONCLUSION Our results support the benefits of wellness education and yoga for improving partner's burden, mood, and anxiety at one year. Our findings are the first to provide an exploration of the impact of multicomponent interventions in care partners of pwMCI.
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Affiliation(s)
- P A Amofa
- Dona E.C. Locke, Division of Psychology, Mayo Clinic, 13400 E. Shea Blvd., Scottsdale, AZ 85259; Ph: 480-301-8297; Fax: 480-301-6258;
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Del Genio AD, Kiang NY, Way MJ, Amundsen DS, Sohl LE, Fujii Y, Chandler M, Aleinov I, Colose CM, Guzewich SD, Kelley M. Albedos, Equilibrium Temperatures, and Surface Temperatures of Habitable Planets. Astrophys J 2019; 884:75. [PMID: 33100349 PMCID: PMC7580787 DOI: 10.3847/1538-4357/ab3be8] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The potential habitability of known exoplanets is often categorized by a nominal equilibrium temperature assuming a Bond albedo of either ∼0.3, similar to Earth, or 0. As an indicator of habitability, this leaves much to be desired, because albedos of other planets can be very different, and because surface temperature exceeds equilibrium temperature due to the atmospheric greenhouse effect. We use an ensemble of general circulation model simulations to show that for a range of habitable planets, much of the variability of Bond albedo, equilibrium temperature and even surface temperature can be predicted with useful accuracy from incident stellar flux and stellar temperature, two known parameters for every confirmed exoplanet. Earth's Bond albedo is near the minimum possible for habitable planets orbiting G stars, because of increasing contributions from clouds and sea ice/snow at higher and lower instellations, respectively. For habitable M star planets, Bond albedo is usually lower than Earth's because of near-IR H2O absorption, except at high instellation where clouds are important. We apply relationships derived from this behavior to several known exoplanets to derive zeroth-order estimates of their potential habitability. More expansive multivariate statistical models that include currently non-observable parameters show that greenhouse gas variations produce significant variance in albedo and surface temperature, while increasing length of day and land fraction decrease surface temperature; insights for other parameters are limited by our sampling. We discuss how emerging information from global climate models might resolve some degeneracies and help focus scarce observing resources on the most promising planets.
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Affiliation(s)
- Anthony D Del Genio
- NASA Goddard Institute for Space Studies, 2880 Broadway, New York, NY 10025, USA
| | - Nancy Y Kiang
- NASA Goddard Institute for Space Studies, 2880 Broadway, New York, NY 10025, USA
| | - Michael J Way
- NASA Goddard Institute for Space Studies, 2880 Broadway, New York, NY 10025, USA
| | - David S Amundsen
- NASA Goddard Institute for Space Studies, 2880 Broadway, New York, NY 10025, USA
- Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY 10027, USA
| | - Linda E Sohl
- NASA Goddard Institute for Space Studies, 2880 Broadway, New York, NY 10025, USA
- Center for Climate Systems Research, Columbia University, New York, NY 10027, USA
| | - Yuka Fujii
- Earth-Life Science Institute, Tokyo Institute of Technology, Ookayama, Meguro, Tokyo 152-8550, Japan
| | - Mark Chandler
- NASA Goddard Institute for Space Studies, 2880 Broadway, New York, NY 10025, USA
- Center for Climate Systems Research, Columbia University, New York, NY 10027, USA
| | - Igor Aleinov
- NASA Goddard Institute for Space Studies, 2880 Broadway, New York, NY 10025, USA
- Center for Climate Systems Research, Columbia University, New York, NY 10027, USA
| | - Christopher M Colose
- NASA Postdoctoral Program, Goddard Institute for Space Studies, New York, NY 10025, USA
| | | | - Maxwell Kelley
- NASA Goddard Institute for Space Studies, 2880 Broadway, New York, NY 10025, USA
- SciSpace LLC, 2880 Broadway, New York, NY 10025, USA
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Jameel BM, Huynh A, Chadha A, Pandey S, Duncan J, Chandler M, Baki G. Computer-based formulation design and optimization using Hansen solubility parameters to enhance the delivery of ibuprofen through the skin. Int J Pharm 2019; 569:118549. [PMID: 31394188 DOI: 10.1016/j.ijpharm.2019.118549] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2019] [Revised: 07/09/2019] [Accepted: 07/19/2019] [Indexed: 10/26/2022]
Abstract
Trial-and-error approach to formulation development is long and costly. With growing time and cost pressures in the pharmaceutical industry, the need for computer-based formulation design is greater than ever. In this project, emulgels were designed and optimized using Formulating for Efficacy™ (FFE) for the topical delivery of ibuprofen. FFE helped select penetration enhancers, design and optimize emulgels and simulate skin penetration studies. pH, viscosity, spreadability, droplet size and stability of emulgels were evaluated. Franz cell studies were performed to test in vitro drug release on regenerated cellulose membrane, drug permeation in vitro on Strat-M® membrane and ex vivo on porcine ear skin, a marketed ibuprofen gel served as control. Emulgels had skin compatible pH, viscosity and spreadability comparable to a marketed emulgel, were opaque and stable at 25 °C for 6 months. Oleyl alcohol (OA), combined with either dimethyl isosorbide (DMI) or diethylene glycol monoethyl ether (DGME) provided the highest permeation in 24 h in vitro, which was significantly higher than the marketed product (p < 0.01). OA + DGME significantly outperformed OA ex vivo (p < 0.05). The computer predictions, in vitro and ex vivo penetration results correlated well. FFE was a fast, valuable and reliable tool for aiding in topical product design for ibuprofen.
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Affiliation(s)
- Bshaer M Jameel
- The University of Toledo, College of Pharmacy and Pharmaceutical Sciences, Department of Pharmacy Practice, 3000 Arlington Ave, Toledo, OH 43614, United States.
| | - An Huynh
- The University of Toledo, College of Pharmacy and Pharmaceutical Sciences, Department of Pharmacy Practice, 3000 Arlington Ave, Toledo, OH 43614, United States.
| | - Aastha Chadha
- The University of Toledo, College of Pharmacy and Pharmaceutical Sciences, Department of Pharmacy Practice, 3000 Arlington Ave, Toledo, OH 43614, United States
| | - Sujata Pandey
- The University of Toledo, College of Pharmacy and Pharmaceutical Sciences, Department of Pharmacy Practice, 3000 Arlington Ave, Toledo, OH 43614, United States.
| | - Jacalyn Duncan
- The University of Toledo, College of Pharmacy and Pharmaceutical Sciences, Department of Pharmacy Practice, 3000 Arlington Ave, Toledo, OH 43614, United States.
| | - Mark Chandler
- ACT Solutions Corp, 550 S. College Ave., Suite 110, Newark, DE 19713, United States.
| | - Gabriella Baki
- The University of Toledo, College of Pharmacy and Pharmaceutical Sciences, Department of Pharmacy Practice, 3000 Arlington Ave, Toledo, OH 43614, United States.
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Davi R, Chandler M, Elashoff B, Ferris AS, Howland A, Lee D, Majumdar A, Stewart M, Strianese L, Stuart E, Yin X, Yver A. Non-small cell lung cancer (NSCLC) case study examining whether results in a randomized control arm are replicated by a synthetic control arm (SCA). J Clin Oncol 2019. [DOI: 10.1200/jco.2019.37.15_suppl.9108] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
9108 Background: The FDA’s accelerated approval (AA) pathway provides conditional approval for an investigational product (IP) after positive effect on a surrogate endpoint has been provided, allowing patients earlier access to the therapy. Confirmation of a positive effect on the clinical endpoint after conditional approval is required and usually includes a randomized trial. However, such a trial is challenged by availability of the IP outside the trial. Recruitment becomes more difficult, and patients assigned to control are more likely to drop-out and use the non-assigned IP, which may bias the observed treatment effect. In AA settings we propose a SCA composed of patient level data from previous clinical trials to augment or replace the randomized control. Validity of this approach in one case study is assessed by examining if a SCA can replicate the outcomes of a target randomized control (TRC) from a recent NSCLC trial. Methods: The patients for the NSCLC SCA were required to have satisfied the key eligibility criteria of the target trial and were further selected using a propensity score-based approach to balance the baseline characteristics in the SCA and TRC. All patient selections were made without knowledge of patient outcomes. Results: The results show comparable balance in observed baseline characteristics of the SCA and TRC was achieved. Overall survival (OS) in TRC was replicated by SCA. The Kaplan Meier curves for OS in the SCA and TRC visually overlap. In addition, the log rank test (p = 0.65) and hazard ratio of 1.04 (95% CI: (0.88, 1.23)) were not statistically significant. Conclusions: If the SCA had been in place of the randomized control in this study, conclusions about the treatment effect would have been the same. While this may not hold when it is not possible to balance the groups on all confounders, this suggests that in some settings, SCA could augment or replace the randomized control in future trials easing recruitment, retention, and crossover challenges without compromising the understanding of the treatment effect. Future work should examine in what settings SCA is appropriate and consider the implications of potential unobserved confounders.
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16
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Cannon L, Chandler M, Kovalick LK, Wu EY. Ace the case: a 14-year-old with lower extremity weakness and blurry vision. BMJ Case Rep 2018; 2018:bcr-2018-226535. [DOI: 10.1136/bcr-2018-226535] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
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Reed CC, Winters JM, Hart SC, Hutchinson R, Chandler M, Venicx G, Sullivan BW. Building flux capacity: Citizen scientists increase resolution of soil greenhouse gas fluxes. PLoS One 2018; 13:e0198997. [PMID: 29975686 PMCID: PMC6033390 DOI: 10.1371/journal.pone.0198997] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2017] [Accepted: 05/30/2018] [Indexed: 11/19/2022] Open
Abstract
Though citizen science programs have been broadly successful in diverse scientific fields, their adoption has lagged in some disciplines, including soil science and ecosystem ecology. Collaborations with citizen scientists may be viewed as a conundrum in these disciplines, which often require substantial labor and technical experience; citizen scientists could improve sampling capacity but may reduce sample quality or require training and oversight prior to and while performing specialized tasks. To demonstrate the feasibility of incorporating citizen scientists into soil biogeochemistry research, we conducted a proof-of-concept study in high-elevation meadows of the Sierra Nevada in California. A collaboration between university researchers and citizen scientists allowed us to assess spatial and diel patterns of soil greenhouse gas (GHG) fluxes with an intensity and frequency that would otherwise be beyond the capacity of a typical research laboratory. This collaboration with citizen scientists increased our sampling intensity by over 700% while only doubling the sampling error relative to that of full-time researchers. With training and support from project scientists, citizen scientists collected data that demonstrate spatial independence of carbon dioxide, methane, and nitrous oxide at scales between 1 m and 175 m. Additionally, we found a lack of temporal variation over a 24-h period for all three GHGs. Citizen scientists participating in this one-day event reported levels of satisfaction commensurate with longer-term, immersive campaigns. The place-based event also proved an effective tool for teaching intangible concepts of soil biogeochemistry and promoting local conservation. Despite perceived barriers to entry, this study demonstrates the mutual benefits of citizen science collaborations in soil science and ecosystem ecology, encouraging adoption by disciplines that have been slow to take advantage of such collaborations. Short-term, local citizen science events can provide meaningful experiences for area residents and teach global biogeochemical cycles in a place-based context.
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Affiliation(s)
- Cody C. Reed
- Department of Natural Resources & Environmental Science, The University of Nevada Reno, Reno, Nevada, United States of America
- * E-mail:
| | - Julianne M. Winters
- Department of Integrative Biology, University of California Berkeley, Berkeley, California, United States of America
| | - Stephen C. Hart
- Life & Environmental Sciences and Sierra Nevada Research Institute, University of California Merced, Merced, California, United States of America
| | - Rachel Hutchinson
- South Yuba River Citizens League, Nevada City, California, United States of America
| | - Mark Chandler
- Earthwatch Institute, Allston, Massachusetts, United States of America
| | - Gitte Venicx
- Earthwatch Institute, Allston, Massachusetts, United States of America
| | - Benjamin W. Sullivan
- Department of Natural Resources & Environmental Science, The University of Nevada Reno, Reno, Nevada, United States of America
- The Global Water Center, The University of Nevada Reno, Reno, Nevada, United States of America
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Bunn TL, Slavova S, Chandler M, Hanner N, Singleton M. Surveillance of traffic incident management-related occupational fatalities in Kentucky, 2005-2016. Traffic Inj Prev 2018; 19:446-453. [PMID: 29381397 DOI: 10.1080/15389588.2018.1432042] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Accepted: 01/21/2018] [Indexed: 06/07/2023]
Abstract
OBJECTIVE Traffic incidents occurring on roadways require the coordinated effort of multiple responder and recovery entities, including communications, law enforcement, fire and rescue, emergency medical services, hazardous materials, transportation agencies, and towing and recovery. The objectives of this study were to (1) identify and characterize transportation incident management (TIM)-related occupational fatalities; (2) assess concordance of surveillance data sources in identifying TIM occupations, driver vs. pedestrian status, and occupational fatality incident location; and (3) determine and compare U.S. occupational fatality rates for TIM industries. METHODS The Kentucky Fatality Assessment and Control Evaluation (FACE) program analyzed 2005-2016 TIM occupational fatality data using multiple data sources: death certificate data, Collision Report Analysis for Safer Highways (CRASH) data, and media reports, among others. Literal text analysis was performed on FACE data, and a multiple linear regression model and SAS proc sgpanel were used to estimate and visualize the U.S. TIM occupational mortality trend lines and confidence bounds. RESULTS There were 29 TIM fatalities from 2005 to 2015 in Kentucky; 41% of decedents were in the police protection occupation, and 21% each were in the fire protection and motor vehicle towing industries. Over one half of the TIM decedents were performing work activities as pedestrians when they died. Media reports identified the majority of the occupational fatalities as TIM related (28 of 29 TIM-related deaths); the use of death certificates as the sole surveillance data source only identified 17 of the 29 deaths as TIM related, and the use of CRASH data only identified 4 of the 29 deaths as TIM related. Injury scenario text analysis showed that law enforcement vehicle pursuit, towing and recovery vehicle loading, and disabled vehicle response were particular high-risk activities that led to TIM deaths. Using U.S. data, the motor vehicle towing industry had a significantly higher risk for occupational mortality compared to the fire protection and police protection industries. CONCLUSIONS Multiple data sources are needed to comprehensively identify TIM fatalities and to examine the circumstances surrounding TIM fatalities, because no one data source in itself was adequate and undercounted the total number of TIM fatalities. The motor vehicle towing industry, in particular, is at elevated risk for occupational mortality, and targeted mandatory TIM training for the motor vehicle towing industry should be considered. In addition, enhanced law enforcement roadside safety training during vehicle pursuit and apprehension of suspects is recommended.
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Affiliation(s)
- T L Bunn
- a Kentucky Injury Prevention and Research Center, bona fide agent for Kentucky Department for Public Health , University of Kentucky, College of Public Health , Lexington , Kentucky
| | - S Slavova
- a Kentucky Injury Prevention and Research Center, bona fide agent for Kentucky Department for Public Health , University of Kentucky, College of Public Health , Lexington , Kentucky
| | - M Chandler
- a Kentucky Injury Prevention and Research Center, bona fide agent for Kentucky Department for Public Health , University of Kentucky, College of Public Health , Lexington , Kentucky
| | - N Hanner
- a Kentucky Injury Prevention and Research Center, bona fide agent for Kentucky Department for Public Health , University of Kentucky, College of Public Health , Lexington , Kentucky
| | - M Singleton
- a Kentucky Injury Prevention and Research Center, bona fide agent for Kentucky Department for Public Health , University of Kentucky, College of Public Health , Lexington , Kentucky
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Baki G, Szoboszlai M, Liberatore MW, Chandler M. Application of Check-All-That-Apply (CATA) Questions for Sensory Characterization of Cosmetic Emulsions by Untrained Consumers. J Cosmet Sci 2018; 69:83-100. [PMID: 29799807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The sales potential of cosmetic products is greatly determined by skin feel and skin sensory performance. To please the target audience, it is important to gather information about consumers' perception of products' sensory characteristics. In this study, six different emulsions were formulated. Samples represented three different types of emulsions, including steric-stabilized oil-in-water (O/W), liquid crystal-stabilized O/W, and water-in-oil emulsions, providing different skin feel and aesthetics. Emulsions within the same group differed in the emollients, providing similar sensory attributes. The aim was to have 50 consumers evaluate the emulsions' sensory characteristics. Using a check-all-that-apply (CATA) survey, consumers provided information about their perception of appearance, rub-out, pick-up, and afterfeel. Consumers effectively discriminated between the emulsions. Statistical analysis showed significant differences for 15 sensory attributes in the before, during, and after phases. Our findings suggest that emulsifiers, and not emollients, have the dominant role in determining the aesthetics of a skin care emulsion, similar to previous findings. The fact that untrained consumers provided similar results as trained panelists suggests the validity of the CATA survey and its reliability as a screening tool in the product development process. CATA questions may serve as a viable complimentary to descriptive sensory analysis performed by trained panelists.
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Affiliation(s)
- Gabriella Baki
- Department of Pharmacy Practice, College of Pharmacy and Pharmaceutical Sciences, University of Toledo, Toledo, OH (G.B., M.C.), Department of Economic Analysis and Forecast, Division of Applied Research, Central Bank of Hungary, Budapest, Hungary 1054 (M.S.), Department of Chemical Engineering, College of Engineering, University of Toledo, Toledo, OH (M.W.L.), and ACT Solutions Corp., Newark, DE (M.C.)
| | - Mihaly Szoboszlai
- Department of Pharmacy Practice, College of Pharmacy and Pharmaceutical Sciences, University of Toledo, Toledo, OH (G.B., M.C.), Department of Economic Analysis and Forecast, Division of Applied Research, Central Bank of Hungary, Budapest, Hungary 1054 (M.S.), Department of Chemical Engineering, College of Engineering, University of Toledo, Toledo, OH (M.W.L.), and ACT Solutions Corp., Newark, DE (M.C.)
| | - Matthew W Liberatore
- Department of Pharmacy Practice, College of Pharmacy and Pharmaceutical Sciences, University of Toledo, Toledo, OH (G.B., M.C.), Department of Economic Analysis and Forecast, Division of Applied Research, Central Bank of Hungary, Budapest, Hungary 1054 (M.S.), Department of Chemical Engineering, College of Engineering, University of Toledo, Toledo, OH (M.W.L.), and ACT Solutions Corp., Newark, DE (M.C.)
| | - Mark Chandler
- Department of Pharmacy Practice, College of Pharmacy and Pharmaceutical Sciences, University of Toledo, Toledo, OH (G.B., M.C.), Department of Economic Analysis and Forecast, Division of Applied Research, Central Bank of Hungary, Budapest, Hungary 1054 (M.S.), Department of Chemical Engineering, College of Engineering, University of Toledo, Toledo, OH (M.W.L.), and ACT Solutions Corp., Newark, DE (M.C.)
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Pocock MJ, Chandler M, Bonney R, Thornhill I, Albin A, August T, Bachman S, Brown PM, Cunha DGF, Grez A, Jackson C, Peters M, Rabarijaon NR, Roy HE, Zaviezo T, Danielsen F. A Vision for Global Biodiversity Monitoring With Citizen Science. ADV ECOL RES 2018. [DOI: 10.1016/bs.aecr.2018.06.003] [Citation(s) in RCA: 76] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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Berry DA, Elashoff M, Blotner S, Davi R, Beineke P, Chandler M, Lee DS, Chen LC, Sarkar S. Creating a synthetic control arm from previous clinical trials: Application to establishing early end points as indicators of overall survival in acute myeloid leukemia (AML). J Clin Oncol 2017. [DOI: 10.1200/jco.2017.35.15_suppl.7021] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
7021 Background: Clinical trials of experimental drugs require controls. Concurrently randomized controls are the gold standard for judging drug effect. Historical controls are not ideal but are much more efficient and economical. Historical controls derived from a single clinical trial have the biases of that trial. Using many trials with comparable end points and eligibility minimizes such bias. Medidata’s archive contains >3000 trials with clinical data rights for deidentified aggregated analyses. We used this resource to develop a synthetic control arm (SCA) for a particular phase I/II single-arm trial in AML. We demonstrate the utility of this approach by addressing a different but equally important issue: establishing early end points as predictors of long term clinical outcomes. Methods: We built an SCA from 7 relapsed/refractory AML trials completed in last 5 yrs. They had similar eligibility criteria as a particular phase I/II trial for an investigational agent. We selected subjects for the SCA who had baseline covariates matching the subjects in the tri.al. Data cleaning and standardization ensured consistency of data fields. The primary outcomes were CR (complete remission) and CRi (CR without hematologic recovery) at 56 days, and overall survival (OS) subsequent to 56 days. Non-CR/non-CRi deaths before 56 days were set to OS=0. We used a landmark analysis to correlate CR and CRi with OS, calculating the hazard ratio (HR) of OS of CR and CRi vs its comparison group. Results: The SCA included 340 subjects (median age 63 yrs, 55% male, 77% White Non-Hispanic, 28% ECOG 0). Results are in this table. Conclusions: The Medidata trial archive is a resource for creating SCAs. The example SCA we created identified well-defined subjects for whom a CR or CRi is associated with longer OS. Investigations of SCAs for other drugs could aid in addressing the types of subjects and drug categories for which CR or CR/CRi predict longer OS. Such information can help build more efficient and more informative adaptive clinical trials. [Table: see text]
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Affiliation(s)
- Donald A. Berry
- The University of Texas MD Anderson Cancer Center, Houston, TX
| | | | - Steven Blotner
- Hoffmann-La Roche Inc., Translational Clinical Research Center, New York, NY
| | | | | | | | | | - Lin Chi Chen
- Roche Pharma Research and Early Development, New York, NY
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Russell RA, Fox ET, Nolan R, Chandler M, Head AC, Brusoski M, De Long HC, Trulove PC. Natural Fiber Welding of Chitin and Chitosan on a Cotton Cloth Substrate: Novel Materials Displaying Antimicrobial Properties. ACTA ACUST UNITED AC 2016. [DOI: 10.1149/07515.0693ecst] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Burch JL, Torbert RB, Phan TD, Chen LJ, Moore TE, Ergun RE, Eastwood JP, Gershman DJ, Cassak PA, Argall MR, Wang S, Hesse M, Pollock CJ, Giles BL, Nakamura R, Mauk BH, Fuselier SA, Russell CT, Strangeway RJ, Drake JF, Shay MA, Khotyaintsev YV, Lindqvist PA, Marklund G, Wilder FD, Young DT, Torkar K, Goldstein J, Dorelli JC, Avanov LA, Oka M, Baker DN, Jaynes AN, Goodrich KA, Cohen IJ, Turner DL, Fennell JF, Blake JB, Clemmons J, Goldman M, Newman D, Petrinec SM, Trattner KJ, Lavraud B, Reiff PH, Baumjohann W, Magnes W, Steller M, Lewis W, Saito Y, Coffey V, Chandler M. Electron-scale measurements of magnetic reconnection in space. Science 2016; 352:aaf2939. [PMID: 27174677 DOI: 10.1126/science.aaf2939] [Citation(s) in RCA: 438] [Impact Index Per Article: 54.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Accepted: 05/03/2016] [Indexed: 11/02/2022]
Abstract
Magnetic reconnection is a fundamental physical process in plasmas whereby stored magnetic energy is converted into heat and kinetic energy of charged particles. Reconnection occurs in many astrophysical plasma environments and in laboratory plasmas. Using measurements with very high time resolution, NASA's Magnetospheric Multiscale (MMS) mission has found direct evidence for electron demagnetization and acceleration at sites along the sunward boundary of Earth's magnetosphere where the interplanetary magnetic field reconnects with the terrestrial magnetic field. We have (i) observed the conversion of magnetic energy to particle energy; (ii) measured the electric field and current, which together cause the dissipation of magnetic energy; and (iii) identified the electron population that carries the current as a result of demagnetization and acceleration within the reconnection diffusion/dissipation region.
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Affiliation(s)
- J L Burch
- Southwest Research Institute, San Antonio, TX, USA.
| | - R B Torbert
- Southwest Research Institute, San Antonio, TX, USA. University of New Hampshire, Durham, NH, USA
| | - T D Phan
- University of California, Berkeley, CA, USA
| | - L-J Chen
- University of Maryland, College Park, MD, USA
| | - T E Moore
- NASA, Goddard Space Flight Center, Greenbelt, MD, USA
| | - R E Ergun
- University of Colorado LASP, Boulder, CO, USA
| | - J P Eastwood
- Blackett Laboratory, Imperial College London, London, UK
| | - D J Gershman
- NASA, Goddard Space Flight Center, Greenbelt, MD, USA
| | - P A Cassak
- West Virginia University, Morgantown, WV, USA
| | - M R Argall
- University of New Hampshire, Durham, NH, USA
| | - S Wang
- University of Maryland, College Park, MD, USA
| | - M Hesse
- NASA, Goddard Space Flight Center, Greenbelt, MD, USA
| | - C J Pollock
- NASA, Goddard Space Flight Center, Greenbelt, MD, USA
| | - B L Giles
- NASA, Goddard Space Flight Center, Greenbelt, MD, USA
| | - R Nakamura
- Space Research Institute, Austrian Academy of Sciences, Graz, Austria
| | - B H Mauk
- Johns Hopkins University Applied Physics Laboratory, Laurel, MD, USA
| | - S A Fuselier
- Southwest Research Institute, San Antonio, TX, USA
| | - C T Russell
- University of California, Los Angeles, CA, USA
| | | | - J F Drake
- University of Maryland, College Park, MD, USA
| | - M A Shay
- University of Delaware, Newark, DE, USA
| | | | | | - G Marklund
- Royal Institute of Technology, Stockholm, Sweden
| | - F D Wilder
- University of Colorado LASP, Boulder, CO, USA
| | - D T Young
- Southwest Research Institute, San Antonio, TX, USA
| | - K Torkar
- Space Research Institute, Austrian Academy of Sciences, Graz, Austria
| | - J Goldstein
- Southwest Research Institute, San Antonio, TX, USA
| | - J C Dorelli
- NASA, Goddard Space Flight Center, Greenbelt, MD, USA
| | - L A Avanov
- NASA, Goddard Space Flight Center, Greenbelt, MD, USA
| | - M Oka
- University of California, Berkeley, CA, USA
| | - D N Baker
- University of Colorado LASP, Boulder, CO, USA
| | - A N Jaynes
- University of Colorado LASP, Boulder, CO, USA
| | | | - I J Cohen
- Johns Hopkins University Applied Physics Laboratory, Laurel, MD, USA
| | - D L Turner
- Aerospace Corporation, El Segundo, CA, USA
| | | | - J B Blake
- Aerospace Corporation, El Segundo, CA, USA
| | - J Clemmons
- Aerospace Corporation, El Segundo, CA, USA
| | - M Goldman
- University of Colorado, Boulder, CO, USA
| | - D Newman
- University of Colorado, Boulder, CO, USA
| | - S M Petrinec
- Lockheed Martin Advanced Technology Center, Palo Alto, CA, USA
| | | | - B Lavraud
- Institut de Recherche en Astrophysique et Planétologie, Toulouse, France
| | - P H Reiff
- Department of Physics and Astronomy, Rice University, Houston, TX, USA
| | - W Baumjohann
- Space Research Institute, Austrian Academy of Sciences, Graz, Austria
| | - W Magnes
- Space Research Institute, Austrian Academy of Sciences, Graz, Austria
| | - M Steller
- Space Research Institute, Austrian Academy of Sciences, Graz, Austria
| | - W Lewis
- Southwest Research Institute, San Antonio, TX, USA
| | - Y Saito
- Institute for Space and Astronautical Sciences, Sagamihara, Japan
| | - V Coffey
- NASA, Marshall Space Flight Center, Huntsville, AL, USA
| | - M Chandler
- NASA, Marshall Space Flight Center, Huntsville, AL, USA
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Banks JE, Hannon LM, Dietsch TV, Chandler M. Effects of seasonality and farm proximity to forest on Hymenoptera in Tarrazú coffee farms. International Journal of Biodiversity Science, Ecosystem Services & Management 2014. [DOI: 10.1080/21513732.2014.905494] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
Affiliation(s)
- John E. Banks
- Environmental Science, Interdisciplinary Arts & Sciences, University of Washington, Tacoma, WA, USA
| | - Lisa M. Hannon
- School of Environmental & Forest Sciences, University of Washington, Seattle, WA, USA
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Abstract
Deciding between a passive heat and moisture exchanger or active humidification depends upon the level of humidification that either will deliver. Published international standards dictate that active humidifiers should deliver a minimum humidity of 33 mg.l(-1); however, no such requirement exists, for heat and moisture exchangers. Anaesthetists instead have to rely on information provided by manufacturers, which may not allow comparison of different devices and their clinical effectiveness. I suggest that measurement of humidification efficiency, being the percentage moisture returned and determined by measuring the temperature of the respired gases, should be mandated, and report a modification of the standard method that will allow this to be easily measured. In this study, different types of heat and moisture exchangers for adults, children and patients with a tracheostomy were tested. Adult and paediatric models lost between 6.5 mg.l(-1) and 8.5 mg.l(-1) moisture (corresponding to an efficiency of around 80%); however, the models designed for patients with a tracheostomy lost between 16 mg.l(-1) and 18 mg.l(-1) (60% efficiency). I propose that all heat and moisture exchangers should be tested in this manner and percentage efficiency reported to allow an informed choice between different types and models.
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Jacinto AML, Mellanby RJ, Chandler M, Bommer NX, Carruthers H, Fairbanks LD, Gow AG. Urine concentrations of xanthine, hypoxanthine and uric acid in UK Cavalier King Charles spaniels. J Small Anim Pract 2013; 54:395-8. [PMID: 23859747 DOI: 10.1111/jsap.12106] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
OBJECTIVES Xanthine urolithiasis and asymptomatic xanthinuria have been diagnosed in Cavalier King Charles spaniel dogs suggesting that primary xanthinuria may be a breed-related disorder, although its prevalence remains unclear. The hypothesis of this study was that asymptomatic xanthinuria is common in Cavalier King Charles spaniel dogs. METHODS Free catch urine samples were collected from 35 client-owned Cavalier King Charles spaniel dogs and from 24 dogs of other breeds. The purine metabolites were measured by high-performance liquid chromatography. The urine ratios of xanthine/creatinine and hypoxanthine/creatinine were calculated and compared between the two groups of dogs. RESULTS The urine concentrations of purine metabolites were not significantly different between the two groups and were very low in both. The urine concentrations of xanthine in all 35 Cavalier King Charles spaniel were markedly lower than in the previously reported case of xanthine urolithiasis in a UK Cavalier King Charles spaniel dog. CLINICAL SIGNIFICANCE Asymptomatic xanthinuria was not detected in this UK Cavalier King Charles spaniel population. This data may be used as a reference for urinary purine metabolite concentrations in the dog.
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Affiliation(s)
- A M L Jacinto
- Royal Dick School of Veterinary Studies, Division of Veterinary Clinical Studies, The University of Edinburgh, Hospital for Small Animals, Easter Bush Veterinary Centre, Roslin, Midlothian, Scotland, EH25 9RG
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Abstract
Bleeding disorders associated with trauma are of paramount importance when dealing with the acutely injured individual. Statistically, up to 40% of trauma related deaths are assumed to be related to hemorrhage.1,2 Historically, there have been many varying positions on the way to handle this entity.3–5 Ironically, it is not always the injury but the physiologic sequelae of that injury that lead to trauma associated deaths.6,7 Over time, newer theories have been developed to help the clinician begin to understand the etiology and treatment of this process.6,8,9 The purpose of this paper is to review current literature and explain how these new concepts helped change practice in an urban, academic, Level One Trauma Center.
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Affiliation(s)
| | - Greg Myers
- Denver Health and Hospital, Denver, CO, USA
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Abstract
We describe here the use of the ISfinder database and its associated software. ISfinder was conceived -initially as a comprehensive database for prokaryotic insertion sequences (ISs). It now includes software for visualising complete and partial IS copies in whole genomes (ISbrowser) and for high-quality genome annotation (Insertion Sequence Semi-automatic Genome Annotation).
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Affiliation(s)
- P Siguier
- Centre National de la Recherche Scientifique, LMGM, Toulouse, France
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Vincent A, Bartley E, Chandler M, Kerr K, Russell J, Williams A, McCabe K, Rhudy J. Age and supraspinal modulation of pain: emotional controls of nociception (ECON). The Journal of Pain 2009. [DOI: 10.1016/j.jpain.2009.01.111] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Palit S, Williams A, Rhudy J, Russell J, Bartley E, Chandler M, Kerr K, McCabe K. Further validation of the Emotional Controls (ECON) paradigm: what types of emotional picture contents best modulate pain and nociception? The Journal of Pain 2009. [DOI: 10.1016/j.jpain.2009.01.114] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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DelVentura J, Bartley E, Chandler M, Kerr K, McCabe K, Russell J. Sex differences in emotional modulation of pain and nociception. The Journal of Pain 2009. [DOI: 10.1016/j.jpain.2009.01.134] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Davies H, Brophy S, Fielding A, Bingley P, Chandler M, Hilldrup I, Brooks C, Williams R. Latent autoimmune diabetes in adults (LADA) in South Wales: incidence and characterization. Diabet Med 2008; 25:1354-7. [PMID: 19046228 DOI: 10.1111/j.1464-5491.2008.02580.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
AIM To define the incidence and characteristics of latent autoimmune diabetes in adults (LADA). METHODS We estimated the incidence of LADA by examining the incidence of Type 2 diabetes and calculating the proportion that were antibody positive. The incidence of Type 2 diabetes was calculated by analysis of computer records of 35 out of 36 general practices in Swansea. In addition, thirty-two practices participated in recruiting people with Type 2 diabetes to have glutamic acid decarboxylase (GAD) antibody testing. RESULTS The crude proportion of Type 2 patients testing positive for GAD antibodies (GADA) was 4.0% (28/683). This figure did not change when we analysed only the practices that tested more than 60% of all eligible patients. In these practices, 79% (387/487) of all eligible patients were GADA tested and 14/387 [3.6% (95% confidence interval: 2.1-6.1%)] were classified as having LADA. This gives an incidence of LADA of 9 per 100,000 (95% confidence interval: 4.4-17.8 per 100,000) people per year registered with a general practitioner. Patients testing positive for GADA were more likely to have a lower body mass index, other antibodies, to present with acute symptoms and to have higher glycated haemoglobin. CONCLUSIONS This is the first study of the incidence of LADA in primary care. People with LADA make up a significant proportion of people with apparent Type 2 diabetes. Patients with LADA are likely to be symptomatic, have poorer glycaemic control and have other autoimmune antibodies.
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Affiliation(s)
- H Davies
- Centre for Health Information, Research and Evaluation, School of Medicine, Swansea University, Swansea, UK.
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Abstract
Insertion sequences (ISs) can constitute an important component of prokaryotic (bacterial and archaeal) genomes. Over 1,500 individual ISs are included at present in the ISfinder database (www-is.biotoul.fr), and these represent only a small portion of those in the available prokaryotic genome sequences and those that are being discovered in ongoing sequencing projects. In spite of this diversity, the transposition mechanisms of only a few of these ubiquitous mobile genetic elements are known, and these are all restricted to those present in bacteria. This review presents an overview of ISs within the archaeal kingdom. We first provide a general historical summary of the known properties and behaviors of archaeal ISs. We then consider how transposition might be regulated in some cases by small antisense RNAs and by termination codon readthrough. This is followed by an extensive analysis of the IS content in the sequenced archaeal genomes present in the public databases as of June 2006, which provides an overview of their distribution among the major archaeal classes and species. We show that the diversity of archaeal ISs is very great and comparable to that of bacteria. We compare archaeal ISs to known bacterial ISs and find that most are clearly members of families first described for bacteria. Several cases of lateral gene transfer between bacteria and archaea are clearly documented, notably for methanogenic archaea. However, several archaeal ISs do not have bacterial equivalents but can be grouped into Archaea-specific groups or families. In addition to ISs, we identify and list nonautonomous IS-derived elements, such as miniature inverted-repeat transposable elements. Finally, we present a possible scenario for the evolutionary history of ISs in the Archaea.
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Affiliation(s)
- J Filée
- Laboratoire de Microbiologie et Génétique Moléculaires (UMR5100 CNRS), Campus Université Paul Sabatier, 118 Route de Narbonne, F-31062 Toulouse Cedex, France
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Zerbib D, Prentki P, Gamas P, Freund E, Galas DJ, Chandler M. Functional organization of the ends of IS1: specific binding site for an IS1-encoded protein. Mol Microbiol 2006; 4:1477-1486. [DOI: 10.1111/j.1365-2958.1990.tb02058.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Abstract
The etiology of manganese neurotoxicity is heterogenous and includes exposure to welding fumes, chronic liver failure, and chronic total parental nutrition (TPN). We recently reported that cognitive impairment occurs in welders and patients with chronic liver failure who had evidence of manganese neurotoxicity including abnormal magnetic resonance imaging (MRI) basal ganglia T1 hyperintensity. In this study, we compared the neuropsychological profiles of patients with manganese neurotoxicity and basal ganglia T1 hyperintensities from three different etiologies: welding, chronic liver failure, and chronic TPN. Across all three groups, the neuropsychological profiles suggest frontal and subcortical cognitive impairment, with more widespread abnormalities occurring in the non-welding groups.
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Affiliation(s)
- K J Klos
- Department of Neurology, Mayo Clinic, Rochester, MN, USA
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Abstract
Initiation of transposition requires formation of a synaptic complex between both transposon ends and the transposase (Tpase), the enzyme which catalyses DNA cleavage and strand transfer and which ensures transposon mobility. We have used a single-molecule approach, tethered particle motion (TPM), to observe binding of a Tpase derivative, OrfAB[149], amputated for its C-terminal catalytic domain, to DNA molecules carrying one or two IS911 ends. Binding of OrfAB[149] to a single IS911 end provoked a small shortening of the DNA. This is consistent with a DNA bend introduced by protein binding to a single end. This was confirmed using a classic gel retardation assay with circularly permuted DNA substrates. When two ends were present on the tethered DNA in their natural, inverted, configuration, Tpase not only provoked the short reduction in length but also generated species with greatly reduce effective length consistent with DNA looping between the ends. Once formed, this 'looped' species was very stable. Kinetic analysis in real-time suggested that passage from the bound unlooped to the looped state could involve another species of intermediate length in which both transposon ends are bound. DNA carrying directly repeated ends also gave rise to the looped species but the level of the intermediate species was significantly enhanced. Its accumulation could reflect a less favourable synapse formation from this configuration than for the inverted ends. This is compatible with a model in which Tpase binds separately to and bends each end (the intermediate species) and protein-protein interactions then lead to synapsis (the looped species).
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Affiliation(s)
- N. Pouget
- Laboratoire de Microbiologie et Génétique Moléculaire (UMR CNRS 5100)118 route de Narbonne, 31062 Toulouse cedex, France
- Institut de Pharmacologie et Biologie Structurale (UMR CNRS 5089)205 route de Narbonne 31077 Toulouse cedex, France
| | - C. Turlan
- Laboratoire de Microbiologie et Génétique Moléculaire (UMR CNRS 5100)118 route de Narbonne, 31062 Toulouse cedex, France
| | - N. Destainville
- Laboratoire de Physique Théorique (UMR CNRS 5152), IRSAMC, Université Paul Sabatier118 route de Narbonne, 31062 Toulouse cedex, France
| | - L. Salomé
- Institut de Pharmacologie et Biologie Structurale (UMR CNRS 5089)205 route de Narbonne 31077 Toulouse cedex, France
| | - M. Chandler
- Laboratoire de Microbiologie et Génétique Moléculaire (UMR CNRS 5100)118 route de Narbonne, 31062 Toulouse cedex, France
- To whom correspondence should be addressed. Tel: +33 5 61 33 58 61; Fax: +33 5 61 33 58 58.
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Abstract
The subject of the cementing technique in hip resurfacing has been poorly studied to date. The hip resurfacing prosthesis is unique in the family of cemented prostheses because the cement mantle is blind (hidden underneath the implant) and is radiographically obscured. This presents an immediate challenge to the surgeon at the time of surgery, but also has a longer-term implication in terms of lack of post-operative clinical observation. This should be compared with total hip replacement or total knee replacement where the cement mantle can at least be partially observed both intra- and post-operatively. With this in mind, the objective of this review is, firstly, to understand the cement mantles typically achieved in current clinical practice and, secondly, to identify those factors affecting the cement mantle and to consolidate them into an improved and reproducible cementing technique. The outcome of this work shows that the low-viscosity technique can commonly lead to excessive cement penetration in the proximal femoral head and an incompletely seated component, whereas a more consistent controlled cement mantle can be achieved with a high-viscosity cementing technique. Consequently, it is recommended that a high-viscosity technique should be used to minimize the build-up of excessive cement, to reduce the temperature created by the exothermic polymerization, and to help to ensure correct seating of the prosthesis. A combination of these factors is potentially critical to the clinical success of some articular surface replacement (ASR) procedures. It is important to note that we specifically studied the DePuy ASR system; therefore only the general principles (and not the specifics) of the cementing technique may apply to other resurfacing prostheses, because of differences in internal geometry, clearance, and surgical technique.
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Affiliation(s)
- M Chandler
- DePuy CMW, Cornford Road, Blackpool, Lancashire FY4 4QQ, UK
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Abstract
ISfinder () is a dedicated database for bacterial insertion sequences (ISs). It has superseded the Stanford reference center. One of its functions is to assign IS names and to provide a focal point for a coherent nomenclature. It is also the repository for ISs. Each new IS is indexed together with information such as its DNA sequence and open reading frames or potential coding sequences, the sequence of the ends of the element and target sites, its origin and distribution together with a bibliography where available. Another objective is to continuously monitor ISs to provide updated comprehensive groupings or families and to provide some insight into their phylogenies. The site also contains extensive background information on ISs and transposons in general. Online tools are gradually being added. At present an online Blast facility against the entire bank is available. But additional features will include alignment capability, PsiBLAST and HMM profiles. ISfinder also includes a section on bacterial genomes and is involved in annotating the IS content of these genomes. Finally, this database is currently recommended by several microbiology journals for registration of new IS elements before their publication.
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Affiliation(s)
| | | | | | - J. Mahillon
- Laboratoire de Microbiologie Alimentaire et Environnementale, Université catholique de LouvainCroix du Sud, 2 Bte 12, B-1348 Louvain-la-Neuve, Belgium
| | - M. Chandler
- To whom correspondence should be addressed. Tel: +33 5 61 33 58 58; Fax: +33 5 61 33 58 86;
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King M, Nazareth I, Lampe F, Bower P, Chandler M, Morou M, Sibbald B, Lai R. Conceptual framework and systematic review of the effects of participants' and professionals' preferences in randomised controlled trials. Health Technol Assess 2005; 9:1-186, iii-iv. [PMID: 16153352 DOI: 10.3310/hta9350] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
OBJECTIVES To develop a conceptual framework of preferences for interventions in the context of randomised controlled trials (RCTs), as well as to examine the extent to which preferences affect recruitment to RCTs and modify the measured outcome in RCTs through a systematic review of RCTs that incorporated participants' and professionals' preferences. Also to make recommendations on the role of participants' and professionals' preferences in the evaluation of health technologies. DATA SOURCES Electronic databases. REVIEW METHODS The conceptual review was carried out on published papers in the psychology and economics literature concerning concepts of relevance to patient decision-making and preferences, and their measurement. For the systematic review, studies across all medical specialities meeting strict criteria were selected. Data were then extracted, synthesised and analysed. RESULTS Key elements for a conceptual framework were found to be that preferences are evaluations of an intervention in terms of its desirability and these preferences relate to expectancies and perceived value of the process and outcome of interventions. RCTs differed in the information provided to patients, the complexity of techniques used to provide that information and the degree to which preference elicitation may simply produce pre-existing preferences or actively construct them. Most current RCTs used written information alone. Preference can be measured in many different ways and most RCTs did not provide quantitative measures of preferences, and those that did tended to use very simple measures. The second part of the study, the systematic review included 34 RCTs. The findings gave support to the hypothesis that preferences affect trial recruitment. However, there was less evidence that external validity was seriously compromised. There was some evidence that preferences influenced outcome in a proportion of trials. However, evidence for preference effects was weaker in large trials and after accounting for baseline differences. Preference effects were also inconsistent in direction. There was no evidence that preferences influenced attrition. Therefore, the available evidence does not support the operation of a consistent and important 'preference effect'. Interventions cannot be categorised consistently on degree of participation. Examining differential preference effects based on unreliable categories ran the risk of drawing incorrect conclusions, so this was not carried out. CONCLUSIONS Although patients and physicians often have intervention preferences, our review gives less support to the hypothesis that preferences significantly compromise the internal and external validity of trials. This review adds to the growing evidence that when preferences based on informed expectations or strong ethical objections to an RCT exist, observational methods are a valuable alternative. All RCTs in which participants and/or professionals cannot be masked to treatment arms should attempt to estimate participants' preferences. In this way, the amount of evidence available to answer questions about the effect of treatment preferences within and outwith RCTs could be increased. Furthermore, RCTs should routinely attempt to report the proportion of eligible patients who refused to take part because of their preferences for treatment. The findings also indicate a number of approaches to the design, conduct and analysis of RCTs that take account of participants' and/or professionals' preferences. This is referred to as a methodological tool kit for undertaking RCTs that incorporate some consideration of patients' or professionals' preferences. Future research into the amount and source of information available to patients about interventions in RCTs could be considered, with special emphasis on the relationship between sources inside and outside the RCT context. Qualitative research undertaken as part of ongoing RCTs might be especially useful. The processes by which this information leads to preferences in order to develop or extend the proposed expectancy--value framework could also be examined. Other areas for consideration include: how information about interventions changes participants' preferences; a comparison of the feasibility and effectiveness of different informed consent procedures; how strength of preference varies for different interventions within the same RCT and how these differences can be taken account of in the analysis; the differential effects of patients' and professionals' preferences on evidence arising from RCTs; and whether the standardised measurement of preferences within all RCTs (and analysis of the effect on outcome) would allow the rapid development of a significant evidence base concerning patient preferences, albeit in relation to a single preference design.
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Affiliation(s)
- M King
- Department of Mental Health Sciences, Royal Free and University College Medical School, London, UK
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Reiling SA, Jansen JA, Henley BJ, Singh S, Chattin C, Chandler M, Rowen DW. Prc protease promotes mucoidy in mucA mutants of Pseudomonas aeruginosa. Microbiology (Reading) 2005; 151:2251-2261. [PMID: 16000715 DOI: 10.1099/mic.0.27772-0] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Mucoid strains of Pseudomonas aeruginosa that overproduce the exopolysaccharide alginate are a frequent cause of chronic respiratory infections in cystic fibrosis (CF) patients. The overproduction of alginate by these strains is often caused by mutations within mucA of the algU mucABCD gene cluster. This gene cluster encodes an extreme stress response system composed of the ECF alternative sigma factor AlgU, the anti-sigma factor MucA located in the inner membrane and the negative regulator MucB located in the periplasm. Most of the mutations in mucA found in mucoid strains cause a truncation of the C-terminal, periplasmic domain of MucA. The most significant effect of these mutations appears to be to reduce the levels of MucA. PA3257 (prc) was identified as a regulator of alginate production in P. aeruginosa through the isolation and study of mutations that partially suppressed the mucoid phenotype of a mucA22 strain. The suppressor of mucoidy (som) mutants isolated produced very little alginate when grown on LB medium, but were still mucoid when grown on Pseudomonas isolation agar. These som mutations and another previously isolated suppressor mutation were complemented by cosmids or plasmids carrying PA3257. PA3257 is predicted to encode a periplasmic protease similar to Prc or Tsp of Escherichia coli. Sequencing of prc from three strains with som suppressor mutations confirmed that each had a mutation within the prc coding region. The authors propose that Prc acts to degrade mutant forms of MucA. Additional evidence in support of this hypothesis is: (1) transcription from the AlgU-regulated algD reporter was reduced in som mutants; (2) inactivation of prc affected alginate production in mucoid strains with other mucA mutations found in CF isolates; (3) inactivation or overexpression of prc did not affect alginate production in strains with wild-type MucA.
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Affiliation(s)
- S A Reiling
- Department of Biology, University of Nebraska at Omaha, Omaha, NE 68182, USA
| | - J A Jansen
- Department of Biology, University of Nebraska at Omaha, Omaha, NE 68182, USA
| | - B J Henley
- Department of Biology, University of Nebraska at Omaha, Omaha, NE 68182, USA
| | - S Singh
- Department of Biology, University of Nebraska at Omaha, Omaha, NE 68182, USA
| | - C Chattin
- Department of Biology, University of Nebraska at Omaha, Omaha, NE 68182, USA
| | - M Chandler
- Department of Biology, University of Nebraska at Omaha, Omaha, NE 68182, USA
| | - D W Rowen
- Department of Biology, University of Nebraska at Omaha, Omaha, NE 68182, USA
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Gueguen E, Rousseau P, Duval-Valentin G, Chandler M. The transpososome: control of transposition at the level of catalysis. Trends Microbiol 2005; 13:543-9. [PMID: 16181782 DOI: 10.1016/j.tim.2005.09.002] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2005] [Revised: 08/12/2005] [Accepted: 09/12/2005] [Indexed: 11/17/2022]
Abstract
Studies of several transposable genetic elements have pinpointed the importance of the transpososome, a nucleoprotein complex involving the transposon ends and a transposon-encoded enzyme--the transposase--as a key in regulating transposition. Transpososomes provide a precise architecture within which the chemical reactions involved in transposon displacement occur. Data are accumulating that suggest they are dynamic and undergo staged conformational changes to accommodate different steps in the transposition pathway. This has been underpinned by recent results obtained particularly with Tn5, Tn10 and bacteriophage Mu.
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Affiliation(s)
- E Gueguen
- Laboratoire de Microbiologie et Génétique Moléculaires, CNRS UMR5100, 118 Route de Narbonne, 31062 Toulouse Cedex, France
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Duval-Valentin G, Marty-Cointin B, Chandler M. Requirement of IS911 replication before integration defines a new bacterial transposition pathway. EMBO J 2004; 23:3897-906. [PMID: 15359283 PMCID: PMC522794 DOI: 10.1038/sj.emboj.7600395] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2004] [Accepted: 08/12/2004] [Indexed: 11/08/2022] Open
Abstract
Movement of transposable elements is often accompanied by replication to ensure their proliferation. Replication is associated with both major classes of transposition mechanisms: cut-and-paste and cointegrate formation (paste-and-copy). Cut-and-paste transposition is often activated by replication of the transposon, while in cointegrate formation replication completes integration. We describe a novel transposition mechanism used by insertion sequence IS911, which we call copy-and-paste. IS911 transposes using a circular intermediate (circle), which then integrates into a target. We demonstrate that this is derived from a branched intermediate (figure-eight) in which both ends are joined by a single-strand bridge after a first-strand transfer. In vivo labelling experiments show that the process of circle formation is replicative. The results indicate that the replication pathway not only produces circles from figure-eight but also regenerates the transposon donor plasmid. To confirm the replicative mechanism, we have also used the Escherichia coli terminators (terC) which, when bound by the Tus protein, inhibit replication forks in a polarised manner. Finally, we demonstrate that the primase DnaG is essential, implicating a host-specific replication pathway.
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Affiliation(s)
- G Duval-Valentin
- Laboratoire de Microbiologie et Génétique Moléculaire, Route de Narbonne, Toulouse Cedex, France.
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Chandler M, Green DM, Taylor A, Zeyl CW, Sharbel TF. Chiasma Frequency in Frogs of the Genus Leiopelma (Amphibia; Anura) and a Test of the Hypothesis of Inducible Recombination. Hereditas 2004. [DOI: 10.1111/j.1601-5223.1993.t01-1-00205.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Abstract
The role played by insertion sequence IS911 proteins, OrfA and OrfAB, in the choice of a target for insertion was studied. IS911 transposition occurs in several steps: synapsis of the two transposon ends (IRR and IRL); formation of a figure-of-eight intermediate where both ends are joined by a single-strand bridge; resolution into a circular form carrying an IRR-IRL junction; and insertion into a DNA target. In vivo, with OrfAB alone, an IS911-based transposon integrated with high probability next to an IS911 end located on the target plasmid. OrfA greatly reduced the proportion of these events. This was confirmed in vitro using a transposon with a preformed IRR-IRL junction to examine the final insertion step. Addition of OrfA resulted in a large increase in insertion frequency and greatly increased the proportion of non-targeted insertions. The intermolecular reaction leading to targeted insertion may resemble the intramolecular reaction involving figure-of-eight molecules, which leads to the formation of circles. OrfA could, therefore, be considered as a molecular switch modulating the site-specific recombination activity of OrfAB and facilitating dispersion of the insertion sequence (IS) to 'non-homologous' target sites.
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Affiliation(s)
| | | | | | | | - M. Chandler
- Laboratoire de Microbiologie et Génétique Moléculaire, CNRS UMR5100, 118 Rte de Narbonne, F-31062 Toulouse Cedex, France
Corresponding author e-mail:
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Abstract
Although tracheal intubation remains a valuable tool, it may result in pressure trauma and sore throat. The evidence for an association between these sequelae is not conclusive and sore throat may be caused at the time of intubation. This hypothesis was tested in a mechanical model and the results from tracheal intubation compared with those from insertion of a laryngeal mask airway, which is associated with a lower incidence of sore throat. Use of the model suggests that the tracheal tube and laryngeal mask airway impinge on the pharyngeal wall in different manners and involve different mechanisms for their conformation to the upper airway, but that in a static situation, the forces exerted on the pharyngeal wall are low with both devices. It also suggests that the incidence of sore throat should be lower for softer and smaller tracheal tubes and that the standard 'Magill' curve (radius of curvature 140 +/- 20 mm) is about optimum for the average airway.
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Salanoubat M, Genin S, Artiguenave F, Gouzy J, Mangenot S, Arlat M, Billault A, Brottier P, Camus JC, Cattolico L, Chandler M, Choisne N, Claudel-Renard C, Cunnac S, Demange N, Gaspin C, Lavie M, Moisan A, Robert C, Saurin W, Schiex T, Siguier P, Thébault P, Whalen M, Wincker P, Levy M, Weissenbach J, Boucher CA. Genome sequence of the plant pathogen Ralstonia solanacearum. Nature 2002; 415:497-502. [PMID: 11823852 DOI: 10.1038/415497a] [Citation(s) in RCA: 608] [Impact Index Per Article: 27.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Ralstonia solanacearum is a devastating, soil-borne plant pathogen with a global distribution and an unusually wide host range. It is a model system for the dissection of molecular determinants governing pathogenicity. We present here the complete genome sequence and its analysis of strain GMI1000. The 5.8-megabase (Mb) genome is organized into two replicons: a 3.7-Mb chromosome and a 2.1-Mb megaplasmid. Both replicons have a mosaic structure providing evidence for the acquisition of genes through horizontal gene transfer. Regions containing genetically mobile elements associated with the percentage of G+C bias may have an important function in genome evolution. The genome encodes many proteins potentially associated with a role in pathogenicity. In particular, many putative attachment factors were identified. The complete repertoire of type III secreted effector proteins can be studied. Over 40 candidates were identified. Comparison with other genomes suggests that bacterial plant pathogens and animal pathogens harbour distinct arrays of specialized type III-dependent effectors.
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Affiliation(s)
- M Salanoubat
- Genoscope and CNRS UMR-8030, 2 rue Gaston Crémieux, CP5706, 91057 Evry Cedex, France
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Prudhomme M, Turlan C, Claverys JP, Chandler M. Diversity of Tn4001 transposition products: the flanking IS256 elements can form tandem dimers and IS circles. J Bacteriol 2002; 184:433-43. [PMID: 11751820 PMCID: PMC139565 DOI: 10.1128/jb.184.2.433-443.2002] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
We show that both flanking IS256 elements carried by transposon Tn4001 are capable of generating head-to-tail tandem copies and free circular forms, implying that both are active. Our results suggest that the tandem structures arise from dimeric copies of the donor or vector plasmid present in the population by a mechanism in which an IS256 belonging to one Tn4001 copy attacks an IS256 end carried by the second Tn4001 copy. The resulting structures carry abutted left (inverted left repeat [IRL]) and right (inverted right repeat [IRR]) IS256 ends. Examination of the junction sequence suggested that it may form a relatively good promoter capable of driving transposase synthesis in Escherichia coli. This behavior resembles that of an increasing number of bacterial insertion sequences which generate integrative junctions as part of the transposition cycle. Sequence analysis of the IRL-IRR junctions demonstrated that attack of one end by the other is largely oriented (IRL attacks IRR). Our experiments also defined the functional tips of IS256 as the tips predicted from sequence alignments, confirming that the terminal 4 bp at each end are indeed different. The appearance of these multiple plasmid and transposon forms indicates that care should be exercised when Tn4001 is used in transposition mutagenesis. This is especially true when it is used with naturally transformable hosts, such as Streptococcus pneumoniae, in which reconstitution of the donor plasmid may select for higher-order multimers.
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Affiliation(s)
- M Prudhomme
- Laboratoire de Microbiologie et Génétique Moléculaires, CNRS UMR5100, F31062 Toulouse Cedex, France
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