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Rees CA, Cleon D, Davis AB, Sammy AM, Britto CD, Massaquoi W, Forkpa OW, Johnson AJ, Hook VF, MaCauley JA, Pewu GF, Gorpue M, Gborie A, Brown TT, Fannieh A, Dweh T, Marley RB, Baysah MK, Nowine NN, Niescierenko M, Zaizay L. Cash transfers and nutrition education to improve dietary diversity among children aged 6-23 months in Grand Gedeh County, Liberia: a cluster-randomized trial. J Trop Pediatr 2022; 68:6814389. [PMID: 36350714 DOI: 10.1093/tropej/fmac096] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
OBJECTIVES To evaluate the efficacy of a cash transfer and nutrition education program on dietary diversity among children in Liberia. We hypothesized that a multi-pronged intervention would result in improved dietary diversity among children. METHODS We conducted a three-armed, cluster-randomized study in 42 communities (12 children per community) in Grand Gedeh County, Liberia, over a 12-month period. We randomly assigned communities to control (n = 14 communities), those that received both bimonthly cash transfers and a structured nutrition education program (n = 14 communities) and those that received bimonthly cash transfers alone (n = 14 communities). Community health assistants conducted bimonthly assessments in participants' homes. The primary outcome was the proportion of children aged 6-23 months who met minimum dietary diversity score (i.e., ≥4 food groups consumed per day). Secondary outcomes included meal frequency and healthcare utilization for illnesses (NCT04101487). RESULTS There were 599 children enrolled; 533 (88.9%) were retained through the trial period. The proportion of children who consumed ≥4 food groups per day did not differ among the three arms. However, children randomized to receive cash transfers had higher dietary diversity scores than the control group. Children in communities that received cash transfers alone and with nutrition education consumed significantly more meals per day and were less likely to have visits to clinics or hospitals for illnesses than children in control communities. CONCLUSION Bimonthly, unconditional cash transfers and nutrition education were associated with higher dietary diversity scores, greater meal frequency, and fewer healthcare visits for illnesses among children aged 6-23 months.
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Affiliation(s)
- Chris A Rees
- Division of Pediatric Emergency Medicine, Emory University School of Medicine, Atlanta, GA 30322, USA.,Department of Emergency Medicine, Children's Healthcare of Atlanta, Atlanta, GA 30322, USA
| | - Dadah Cleon
- Independent Consultant, Ministry of Health Liberia, Monrovia 9009, Liberia
| | | | - Andrew M Sammy
- UNICEF Papua New Guinea, Port Moresby 472, Papua New Guinea
| | | | | | | | - Andrew J Johnson
- National Public Health Institute of Liberia, Monrovia 777P+866, Liberia
| | - Varla F Hook
- National Public Health Institute of Liberia, Monrovia 777P+866, Liberia
| | - Jane A MaCauley
- National Public Health Institute of Liberia, Monrovia 777P+866, Liberia
| | - Garbie F Pewu
- National Public Health Institute of Liberia, Monrovia 777P+866, Liberia
| | - Mercy Gorpue
- National Public Health Institute of Liberia, Monrovia 777P+866, Liberia
| | - Amos Gborie
- National Public Health Institute of Liberia, Monrovia 777P+866, Liberia
| | - Trokon T Brown
- National Public Health Institute of Liberia, Monrovia 777P+866, Liberia
| | - Augustine Fannieh
- Grand Gedeh County Health Team, Ministry of Health Liberia, Monrovia 9009, Liberia
| | - Teeline Dweh
- Grand Gedeh County Health Team, Ministry of Health Liberia, Monrovia 9009, Liberia
| | - Ruth B Marley
- Grand Gedeh County Health Team, Ministry of Health Liberia, Monrovia 9009, Liberia
| | - Massaboi K Baysah
- Grand Gedeh County Health Team, Ministry of Health Liberia, Monrovia 9009, Liberia
| | - Netus N Nowine
- Grand Gedeh County Health Team, Ministry of Health Liberia, Monrovia 9009, Liberia
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Scheeres DJ, French AS, Tricarico P, Chesley SR, Takahashi Y, Farnocchia D, McMahon JW, Brack DN, Davis AB, Ballouz RL, Jawin ER, Rozitis B, Emery JP, Ryan AJ, Park RS, Rush BP, Mastrodemos N, Kennedy BM, Bellerose J, Lubey DP, Velez D, Vaughan AT, Leonard JM, Geeraert J, Page B, Antreasian P, Mazarico E, Getzandanner K, Rowlands D, Moreau MC, Small J, Highsmith DE, Goossens S, Palmer EE, Weirich JR, Gaskell RW, Barnouin OS, Daly MG, Seabrook JA, Al Asad MM, Philpott LC, Johnson CL, Hartzell CM, Hamilton VE, Michel P, Walsh KJ, Nolan MC, Lauretta DS. Heterogeneous mass distribution of the rubble-pile asteroid (101955) Bennu. Sci Adv 2020; 6:eabc3350. [PMID: 33033036 PMCID: PMC7544499 DOI: 10.1126/sciadv.abc3350] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Accepted: 09/16/2020] [Indexed: 05/18/2023]
Abstract
The gravity field of a small body provides insight into its internal mass distribution. We used two approaches to measure the gravity field of the rubble-pile asteroid (101955) Bennu: (i) tracking and modeling the spacecraft in orbit about the asteroid and (ii) tracking and modeling pebble-sized particles naturally ejected from Bennu's surface into sustained orbits. These approaches yield statistically consistent results up to degree and order 3, with the particle-based field being statistically significant up to degree and order 9. Comparisons with a constant-density shape model show that Bennu has a heterogeneous mass distribution. These deviations can be modeled with lower densities at Bennu's equatorial bulge and center. The lower-density equator is consistent with recent migration and redistribution of material. The lower-density center is consistent with a past period of rapid rotation, either from a previous Yarkovsky-O'Keefe-Radzievskii-Paddack cycle or arising during Bennu's accretion following the disruption of its parent body.
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Affiliation(s)
- D J Scheeres
- Smead Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO, USA.
| | - A S French
- Smead Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO, USA
| | - P Tricarico
- Planetary Science Institute, Tucson, AZ, USA
| | - S R Chesley
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
| | - Y Takahashi
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
| | - D Farnocchia
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
| | - J W McMahon
- Smead Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO, USA
| | - D N Brack
- Smead Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO, USA
| | - A B Davis
- Smead Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO, USA
| | - R-L Ballouz
- Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA
| | - E R Jawin
- Smithsonian Institution National Museum of Natural History, Washington, DC, USA
| | - B Rozitis
- Planetary and Space Sciences, School of Physical Sciences, The Open University, Milton Keynes, UK
| | - J P Emery
- Department of Astronomy and Planetary Sciences, Northern Arizona University, Flagstaff, AZ, USA
| | - A J Ryan
- Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA
| | - R S Park
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
| | - B P Rush
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
| | - N Mastrodemos
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
| | - B M Kennedy
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
| | - J Bellerose
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
| | - D P Lubey
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
| | - D Velez
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
| | - A T Vaughan
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
| | | | - J Geeraert
- KinetX Aerospace Inc., Simi Valley, CA, USA
| | - B Page
- KinetX Aerospace Inc., Simi Valley, CA, USA
| | | | - E Mazarico
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | | | - D Rowlands
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - M C Moreau
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - J Small
- Aerospace Corporation, Chantilly, VA, USA
| | | | - S Goossens
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
- Center for Research and Exploration in Space Science and Technology, University of Maryland, Baltimore County, Baltimore, MD, USA
| | - E E Palmer
- Planetary Science Institute, Tucson, AZ, USA
| | - J R Weirich
- Planetary Science Institute, Tucson, AZ, USA
| | - R W Gaskell
- Planetary Science Institute, Tucson, AZ, USA
| | - O S Barnouin
- The Johns Hopkins University Applied Physics Laboratory, Laurel, MD, USA
| | - M G Daly
- The Centre for Research in Earth and Space Science, York University, Toronto, ON, Canada
| | - J A Seabrook
- The Centre for Research in Earth and Space Science, York University, Toronto, ON, Canada
| | - M M Al Asad
- Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, Canada
| | - L C Philpott
- Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, Canada
| | - C L Johnson
- Planetary Science Institute, Tucson, AZ, USA
- Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, Canada
| | - C M Hartzell
- Department of Aerospace Engineering, University of Maryland, College Park, MD, USA
| | - V E Hamilton
- Department of Space Studies, Southwest Research Institute, Boulder, CO, USA
| | - P Michel
- Université Côte d'Azur, Observatoire de la Côte d'Azur, CNRS, Laboratoire Lagrange, Nice, France
| | - K J Walsh
- Department of Space Studies, Southwest Research Institute, Boulder, CO, USA
| | - M C Nolan
- Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA
| | - D S Lauretta
- Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA
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3
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Lauretta DS, Hergenrother CW, Chesley SR, Leonard JM, Pelgrift JY, Adam CD, Al Asad M, Antreasian PG, Ballouz RL, Becker KJ, Bennett CA, Bos BJ, Bottke WF, Brozović M, Campins H, Connolly HC, Daly MG, Davis AB, de León J, DellaGiustina DN, Drouet d'Aubigny CY, Dworkin JP, Emery JP, Farnocchia D, Glavin DP, Golish DR, Hartzell CM, Jacobson RA, Jawin ER, Jenniskens P, Kidd JN, Lessac-Chenen EJ, Li JY, Libourel G, Licandro J, Liounis AJ, Maleszewski CK, Manzoni C, May B, McCarthy LK, McMahon JW, Michel P, Molaro JL, Moreau MC, Nelson DS, Owen WM, Rizk B, Roper HL, Rozitis B, Sahr EM, Scheeres DJ, Seabrook JA, Selznick SH, Takahashi Y, Thuillet F, Tricarico P, Vokrouhlický D, Wolner CWV. Episodes of particle ejection from the surface of the active asteroid (101955) Bennu. Science 2020; 366:366/6470/eaay3544. [PMID: 31806784 DOI: 10.1126/science.aay3544] [Citation(s) in RCA: 96] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Accepted: 10/22/2019] [Indexed: 11/02/2022]
Abstract
Active asteroids are those that show evidence of ongoing mass loss. We report repeated instances of particle ejection from the surface of (101955) Bennu, demonstrating that it is an active asteroid. The ejection events were imaged by the OSIRIS-REx (Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer) spacecraft. For the three largest observed events, we estimated the ejected particle velocities and sizes, event times, source regions, and energies. We also determined the trajectories and photometric properties of several gravitationally bound particles that orbited temporarily in the Bennu environment. We consider multiple hypotheses for the mechanisms that lead to particle ejection for the largest events, including rotational disruption, electrostatic lofting, ice sublimation, phyllosilicate dehydration, meteoroid impacts, thermal stress fracturing, and secondary impacts.
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Affiliation(s)
- D S Lauretta
- Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA.
| | - C W Hergenrother
- Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA.
| | - S R Chesley
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
| | | | | | - C D Adam
- KinetX Aerospace, Simi Valley, CA, USA
| | - M Al Asad
- Department of Earth, Ocean, and Atmospheric Sciences, University of British Columbia, Vancouver, BC, Canada
| | | | - R-L Ballouz
- Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA
| | - K J Becker
- Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA
| | - C A Bennett
- Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA
| | - B J Bos
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - W F Bottke
- Southwest Research Institute, Boulder, CO, USA
| | - M Brozović
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
| | - H Campins
- Department of Physics, University of Central Florida, Orlando, FL, USA
| | - H C Connolly
- Department of Geology, Rowan University, Glassboro, NJ, USA.,Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA
| | - M G Daly
- The Centre for Research in Earth and Space Science, York University, Toronto, ON, Canada
| | - A B Davis
- Smead Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO, USA
| | - J de León
- Instituto de Astrofísica de Canarias and Departamento de Astrofísica, Universidad de La Laguna, Tenerife, Spain
| | - D N DellaGiustina
- Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA.,Department of Geosciences, University of Arizona, Tucson, AZ, USA
| | | | - J P Dworkin
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - J P Emery
- Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, TN, USA.,Department of Astronomy and Planetary Sciences, Northern Arizona University, Flagstaff, AZ, USA
| | - D Farnocchia
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
| | - D P Glavin
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - D R Golish
- Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA
| | - C M Hartzell
- Department of Aerospace Engineering, University of Maryland, College Park, MD, USA
| | - R A Jacobson
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
| | - E R Jawin
- Smithsonian Institution National Museum of Natural History, Washington, DC, USA
| | - P Jenniskens
- SETI (Search for Extraterrestrial Intelligence) Institute, Mountain View, CA, USA
| | - J N Kidd
- Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA
| | | | - J-Y Li
- Planetary Science Institute, Tucson, AZ, USA
| | - G Libourel
- Université Côte d'Azur, Observatoire de la Côte d'Azur, CNRS (Centre national de la recherche scientifique), Laboratoire Lagrange, Nice, France
| | - J Licandro
- Instituto de Astrofísica de Canarias and Departamento de Astrofísica, Universidad de La Laguna, Tenerife, Spain
| | - A J Liounis
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | - C K Maleszewski
- Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA
| | - C Manzoni
- London Stereoscopic Company, London, UK
| | - B May
- London Stereoscopic Company, London, UK
| | | | - J W McMahon
- Smead Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO, USA
| | - P Michel
- Université Côte d'Azur, Observatoire de la Côte d'Azur, CNRS (Centre national de la recherche scientifique), Laboratoire Lagrange, Nice, France
| | - J L Molaro
- Planetary Science Institute, Tucson, AZ, USA
| | - M C Moreau
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
| | | | - W M Owen
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
| | - B Rizk
- Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA
| | - H L Roper
- Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA
| | - B Rozitis
- School of Physical Sciences, Open University, Milton Keynes, UK
| | - E M Sahr
- KinetX Aerospace, Simi Valley, CA, USA
| | - D J Scheeres
- Smead Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO, USA
| | - J A Seabrook
- The Centre for Research in Earth and Space Science, York University, Toronto, ON, Canada
| | - S H Selznick
- Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA
| | - Y Takahashi
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
| | - F Thuillet
- Université Côte d'Azur, Observatoire de la Côte d'Azur, CNRS (Centre national de la recherche scientifique), Laboratoire Lagrange, Nice, France
| | - P Tricarico
- Planetary Science Institute, Tucson, AZ, USA
| | - D Vokrouhlický
- Institute of Astronomy, Charles University, Prague, Czech Republic
| | - C W V Wolner
- Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA
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4
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Sornette D, Davis AB, Ide K, Vixie KR, Pisarenko V, Kamm JR. Algorithm for model validation: theory and applications. Proc Natl Acad Sci U S A 2007; 104:6562-7. [PMID: 17420476 PMCID: PMC1871825 DOI: 10.1073/pnas.0611677104] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.1] [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: 11/25/2005] [Indexed: 11/18/2022] Open
Abstract
Validation is often defined as the process of determining the degree to which a model is an accurate representation of the real world from the perspective of its intended uses. Validation is crucial as industries and governments depend increasingly on predictions by computer models to justify their decisions. We propose to formulate the validation of a given model as an iterative construction process that mimics the often implicit process occurring in the minds of scientists. We offer a formal representation of the progressive build-up of trust in the model. Thus, we replace static claims on the impossibility of validating a given model by a dynamic process of constructive approximation. This approach is better adapted to the fuzzy, coarse-grained nature of validation. Our procedure factors in the degree of redundancy versus novelty of the experiments used for validation as well as the degree to which the model predicts the observations. We illustrate the methodology first with the maturation of quantum mechanics as the arguably best established physics theory and then with several concrete examples drawn from some of our primary scientific interests: a cellular automaton model for earthquakes, a multifractal random walk model for financial time series, an anomalous diffusion model for solar radiation transport in the cloudy atmosphere, and a computational fluid dynamics code for the Richtmyer-Meshkov instability.
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Affiliation(s)
- D Sornette
- Institute of Geophysics and Planetary Physics and Departments of Earth and Space Sciences and Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA 90095, USA.
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5
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Davis AB, Eklund JB. Magnesia alba before Black. Pharm Hist 2001; 14:139-46. [PMID: 11609387] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
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6
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Davis AB. The rise of the vitamin-medicinal as illustrated by vitamin D. Pharm Hist 2001; 24:59-72. [PMID: 11610991] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
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7
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Davis AB. [Not Available]. Kos 2001:33-7. [PMID: 11630021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
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8
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Davis AB. [Not Available]. Kos 2001:22-5. [PMID: 11640537] [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: 02/22/2023]
Abstract
Although deriving new insights from knowledge of the scientific aspects of nutrition, a key component of health and the ability to resist disease, the cultural, social and economic factors are equally significant, but were emphasized by the mechanistic-scientific physician. Practical advice, such as counseling patients about the effect of specific foods on their health, was transferred by the mechanistic physicians to nutrition specialists or public health authorities. A variety of intrinsic and extrinsic factors contributed to the development of "high tech" medicine that minimizes or ignores the multi-dimensional dietary component of health and disease, some of which are explored here. The physician will discover that interventions made before disease strikes, especially at an age when health care costs are rising beyond society's ability to pay for them, are as important before than after the body is challenged by illness, particularly in the development of chronic diseases.
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Affiliation(s)
- A B Davis
- National Museum of American History, Washington
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9
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Hyson JM, Davis AB. Basil Manly Wilkerson: dental inventor extraordinaire. J Hist Dent 1999; 47:61-4. [PMID: 10686913] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
Affiliation(s)
- J M Hyson
- National Museum of Dentistry, Baltimore, MD, USA
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10
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Davis AB. The inaugural exhibition of the Dr. Samuel D. Harris National Museum of Dentistry: 32 terrific teeth. MSDA J 1998; 38:111-3. [PMID: 9569862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- A B Davis
- Dr. Samuel D. Harris National Museum of Dentistry, University of Maryland at Baltimore 21201, USA
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Abstract
BACKGROUND Partial reinnervation of cardiac sympathetic nerves has been observed after heart transplantation; we hypothesized that parasympathetic control to the heart after transplantation may return as well. To test this hypothesis, we examined heart rate responses produced by two cardiovascular reflexes whose efferent limbs are subserved by vagal fibers to the heart: (1) trigeminal reflex (simulated diving reflex) and (2) arterial baroreflex with phenylephrine injection. METHODS AND RESULTS An "early" group (n=31, <24 months after transplantation) and a "late group" (n=27, >45 months after transplantation) were studied and compared with a control group with intact cardiac innervation (n=32) and a renal transplant group with similar transplant immunosuppressive regimen (n=11). For trigeminal reflex testing, responses of the donor sinus node (DSN) (sinus node controlling heart rate) and recipient sinus node (RSN) in the innervated remnant right atrium in cardiac transplant patients were compared with heart rate responses in the control groups. For arterial baroreflex testing, baroreflex gains for the DSN and RSN in the cardiac transplant groups were compared with those of the control group. With engagement of the trigeminal reflex, the DSN rate of both transplant groups changed minimally (early, 1.2+/-1.2 bpm; late, 1.8+/-2.5 bpm) compared with the expected decrease in control subjects (-19.8+/-3.0 bpm) and renal transplant patients (-23.9+/-4.9 bpm) (P<.001 versus cardiac transplants). Changes in the RSN rate of both cardiac transplant groups (early, -13.0+/-4.0 bpm; late, -10.0+/-3.7 bpm) were similar to the control groups. Arterial baroreflex gains for the DSN were also depressed (early, 0.1+/-0.2 ms/mm Hg; late, 0.2+/-0.2 ms/mm Hg) compared with control (14.9+/-1.8 ms/mm Hg) and RSN (early, 9.9+/-1.3 ms/mm Hg; late, 10.9+/-1.3 ms/mm Hg; P<.001 versus DSN transplant). CONCLUSIONS These data suggest that parasympathetic influences on donor heart rate are absent in the majority of patients up to 96 months after cardiac transplantation.
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Affiliation(s)
- J A Arrowood
- Medical College of Virginia, Virginia Commonwealth University, Richmond 23298, USA.
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Abstract
If male rats are paired with a receptive, soliciting female rat in a setting that prevents physical contact, but permits auditory, visual, and olfactory contact, some will have erections of the penis--noncontact erections (NCE). Surgical deafferentation of the olfactory bulbs from all the known chemosensory systems of the nasal septum renders rats anosmic, decreases sexual performance in copulation tests with females, and substantially reduces the frequency of NCE. Thus, NCE appear to be primarily regulated though the olfactory perception of volatile chemosensory cues from receptive females.
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Affiliation(s)
- D A Edwards
- Department of Psychology, Emory University, Atlanta, GA 30322, USA.
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13
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Davis AB. Laparoscopic hernia repair in the community hospital setting. Surg Laparosc Endosc Percutan Tech 1996; 6:448-52. [PMID: 8948037] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Eighty-three patients (108 repairs) with inguinal hernias underwent laparoscopic transabdominal preperitoneal repair in the community hospital setting. The patients included 82 men and one woman, ranging in age from 15 to 82 years. Concomitant procedures included umbilical hernia repairs, lysis of adhesions, and varicocoelectomy. Ninety-four percent of these patients were discharged the same day, with only one patient requiring more than an overnight stay. Postoperative complications included five cases of urinary retention requiring overnight catherization (4.6%) and one case each of labile hypertension (0.9%), vasovagal reaction (0.9%), dizziness (0.9%), and ileus (0.9%); there were 12 cases of groin swelling with ecchymosis (11%). With follow-up of almost 2 years, there has been one known recurrence (0.9%). This study demonstrates that laparoscopic hernia repair can be performed safely and successfully in the community hospital setting and can be a sound alternative to the standard open hernia repair.
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Affiliation(s)
- A B Davis
- Department of Surgery, Brockton Hospital and Good Samaritan Hospital, Brockton, Massachusetts, USA
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14
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Mengel MB, Davis AB. Required first-year generalist clinical experience courses and their relationship to career choice: the critical effect of family medicine involvement. Fam Med 1995; 27:652-7. [PMID: 8582558] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
BACKGROUND This study examines the relationships among the presence of a required first-year generalist clinical experience (RFGCE) course, family medicine involvement in such courses, and the percentage of 1993 medical school graduates who chose family practice as a career upon graduation. METHODS A prospective cohort study measured predictor variables in 1989, the presence of a required third-year family medicine clerkship in 1991, and the outcome variable in 1993. RESULTS Data were collected from 122 US 4-year medical schools. Eighty-seven (71.3%) of 122 medical schools had RFGCE courses. In schools with courses and family medicine administrative units, family physicians were involved to some extent in most of these courses (88%). After controlling for type of medical school, the requirement of a third-year family medicine clerkship, and the involvement of a family medicine administrative unit, the presence of an RFGCE course was associated with a 3.5% increase in the number of students who selected a family practice career. This is a 28% increase on average over the mean percentage of medical students choosing a family practice career in 1993. However, in a second analysis, when all predictor variables were entered into the equation, family medicine involvement in such courses replaced the presence of such courses as a statistically significant predictor of medical students selecting family practice as a career. CONCLUSIONS Family physicians are involved to some extent in the great majority of RFGCE courses. Such involvement is associated with an increase in the number of medical students selecting a family practice career upon graduation from medical school.
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Affiliation(s)
- M B Mengel
- Beverly Hospital Family Practice Residency Program, Danvers, Mass, USA
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Abstract
BACKGROUND Orthotopic cardiac transplantation results in total cardiac denervation. Recent studies in humans suggest that reinnervation of cardiac sympathetic nerves (cardiac efferents) may occur after cardiac transplantation. We hypothesized that reinnervation of cardiac afferents may occur as well. To test this hypothesis, we investigated reflex responses produced by stimulation of ventricular chemosensory endings subserved by vagal afferents (cardiac depressor reflex). METHODS AND RESULTS Two cardiac transplant groups were studied: an "early" group (n = 18, < 24 months after transplant) and a "late" group (n = 18, > 43 months after transplant); these groups were compared with a control group with intact innervation (n = 18). The reflex response of the recipient sinus node (RSN) in the remnant right atrium, which remains innervated after transplantation, was observed during selective right coronary artery (RCA) and left coronary artery (LCA) injection of the radiographic contrast agent meglumine diatrizoate, which is known to stimulate ventricular chemosensory endings. A decrease in the rate of the RSN was expected if reinnervation of chemosensory endings had occurred and the afferent limb of the cardiac depressor reflex was intact. With injection, the RSN rate of both transplant groups did not decrease but increased (early: LCA, 7.2 +/- 1.4 beats per minute; RCA, 6.3 +/- 1.3 beats per minute; late: LCA, 5.9 +/- 1.0 beats per minute; RCA, 6.0 +/- 0.9 beats per minute) compared with the expected decrease in control patients (LCA, -20.8 +/- 2.5 beats per minute; RCA, -18.0 +/- 4.0 beats per minute; P < .001 versus transplants). Decreases in mean arterial pressure in the transplant groups (early: LCA, -11.3 +/- 1.4 mm Hg; RCA, -10.0 +/- 1.6 mm Hg; late: LCA, -13.0 +/- 1.6 mm Hg; RCA, -9.1 +/- 1.5 mm Hg) were less than those observed in the control group (LCA, -19.8 +/- 2.2 mm Hg; RCA, -18.7 +/- 4.0 mm Hg; P < .05 versus transplants). CONCLUSIONS The results suggest that reinnervation of ventricular chemosensory endings subserved by vagal afferents in cardiac transplant patients does not occur up to 74 months after transplantation.
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Affiliation(s)
- J A Arrowood
- Medical College of Virginia, Virginia Commonwealth University, Richmond 23298, USA
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Mengel MB, Davis AB. The statistical power of family practice research. Fam Pract Res J 1993; 13:105-11. [PMID: 8517192] [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: 01/31/2023]
Abstract
To determine the statistical power of family practice research, we conducted a survey of all family practice studies published in 3 major family practice journals in 1988. Only 5 of 86 studies calculated statistical power, although 67 (78%) reported statistically nonsignificant results. Calculations of statistical power revealed that more than 80% of family practice studies had sufficient statistical power to detect medium to large effect sizes, but not small effect sizes, which some readers might deem clinically important. We conclude that the authors of family practice research studies do not pay enough attention to the issue of statistical power when reporting statistically nonsignificant results, leaving their readers in doubt as to whether a clinically significant effect could have been detected.
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Affiliation(s)
- M B Mengel
- Department of Family Practice and Community Medicine, University of Texas Health Science Center, Houston 77225
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Abstract
In planning experiments having two groups of equal but small size, investigators face the uncertainty of power calculations that rely on asymptotic methods. This paper presents a method for determining power for two-sided tests. I compare two randomization tests, Fisher's exact test (FET), and the mid-P (MID), with the uncorrected chi-square test (CHI). Results show power as a function of relative risk for these methods, and assesses their relative power and type I error rates. MID is shown to have intermediate power between CHI, which is the most powerful, and FET, the least powerful. Situations are shown in which CHI and MID occasionally exceed the nominal level of alpha.
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Affiliation(s)
- A B Davis
- Department of Family Medicine, College of Medicine, University of Oklahoma Health Sciences Center, Ok. City 73190
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Davis AB. Scholarship in the history of medical technology. Caduceus 1993; 9:131-133. [PMID: 8261324] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Mengel MB, Davis AB. Recurrent bacterial vaginosis: association with vaginal sponge use. Fam Pract Res J 1992; 12:283-8. [PMID: 1414432] [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: 12/26/2022]
Abstract
A hypothesis-generation study was conducted to examine risk factors for bacterial vaginosis recurrences among women participating in a randomized controlled trial of male sexual partner treatment. Of the 140 women enrolled in the trial, 72 had a normal vaginal gram-stained slide at the first follow-up visit and were included in this analysis. Nineteen of the 72 (26.2%) women developed a bacterial vaginosis recurrence documented by a vaginal gram-stained slide during the 6-week follow-up period. Of the 19 women, 4 of 6 sponge users (66%) developed a bacterial vaginosis recurrence (RR 2.93, 95% CI: 1.43-6.02). Logistic regression analysis supported the association between sponge use and bacterial vaginosis recurrences (adjusted RR 2.71, 95% CI: 1.06-6.99) but revealed that an apparent protective effect of diaphragm use was due to the confounding effect of sexual partner treatment. Our hypothesis is that bacterial vaginosis recurrences may be due to factors other than sexual transmission, such as sponge use. Further studies are needed to examine risk factors for bacterial vaginosis recurrences. In the interim, physicians might suggest another form of contraception to their sponge-using patient with frequent bacterial vaginosis infections.
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Affiliation(s)
- M B Mengel
- University of Oklahoma Health Sciences Center, Department of Family Medicine, Oklahoma City 73104
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Mengel MB, Davis AB, Barton ED. Generalist courses in US medical schools and their relationship to career choice. Fam Med 1992; 24:234-7. [PMID: 1577220] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
We conducted a survey of required first-year generalist courses offered by US medical schools during 1980, 1985, and 1990 to see if significant growth had occurred in this curricular area and to determine if the presence of these courses was associated with an increase in the percent of graduates selecting family practice as a career option. During the 1980s, only two types of generalist courses were offered by more than 50% of US medical schools, clinical experience and human behavior/psychiatry courses, with significant growth occurring in only two types of generalist courses, ethics and medical humanities courses. The presence of a required clinical experience course in 1985 was associated with a 2% increase in the number of graduates selecting family practice as a career option in 1988.
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Affiliation(s)
- M B Mengel
- Department of Family Practice and Community Medicine, University of Texas Medical School-Houston
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Mold JW, Reed LE, Davis AB, Allen ML, Decktor DL, Robinson M. Prevalence of gastroesophageal reflux in elderly patients in a primary care setting. Am J Gastroenterol 1991; 86:965-70. [PMID: 1858762] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Despite the aging of our population, there remains a paucity of information about gastroesophageal reflux (GER) in the elderly. To assess the prevalence and characteristics of GER within this patient population, questionnaires evaluating symptoms associated with GER were administered to 313 consecutive patients 62 yr old or older from a primary care setting. Fourteen percent of these patients reported having at least weekly heartburn. Ambulatory 24-h esophageal pH monitoring was accomplished in 54 of the 313 patients surveyed. Twenty percent (11/54) of this subgroup exhibited increased acid contact time (pH less than 4 for more than 6% of the monitoring period). Twenty-two percent (12/54) complained of heartburn, yet only six individuals (11%) exhibited both symptomatic and objective indications of acid reflux. Surprisingly, 31% (17/54) of the patients studied exhibited significant alkalinity within the distal esophagus (pH greater than 8 for greater than 1.5% of the monitoring period). Whereas 29% of these patients (5/17) reported heartburn, 40% of those reporting heartburn (2/5) had acid GER as well as excessive alkalinity. In contrast to patients with acid GER--none of whom reported pulmonary symptoms--24% (4/17) of these patients with esophageal alkalinity reported wheezing, nocturnal cough, or paroxysmal nocturnal dyspnea. Of the four patients with significant distal esophageal exposure to both acid and alkali, two reported heartburn and a third reported dysphagia. In addition to the somewhat higher prevalence of acid reflux than anticipated, a surprisingly high prevalence of esophageal alkalinity was observed.
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Affiliation(s)
- J W Mold
- University of Oklahoma Health Sciences Center, Department of Family Medicine, Oklahoma City
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Davis AB, Glenner RA. Collecting dental antiques. Bull Hist Dent 1991; 39:11-6. [PMID: 1811822] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- A B Davis
- Smithsonian Institution, Washington, DC 20560
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Davis AB. American medicine in the gilded age: the first technological era. Ann Sci 1990; 47:111-125. [PMID: 11613182 DOI: 10.1080/00033799000200151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Abstract
Sexual experiences of 1255 adolescents admitted to a juvenile detention facility were assessed through their responses to a health history questionnaire. More than 80% reported sexual experience. Age at first intercourse acknowledged by females was early (mean 13 years) but rarely prepubertal and was similar for blacks and nonblacks. Males commonly reported beginning sexual experience before age 10 years (40% in blacks and 20% in nonblacks). Sexual activity continued in most, with 73% of the sexually experienced teens reporting intercourse in the month prior to admission. Reports of recent sexual activity increased with age in all race/gender groups. For females, 26% reported sexual misuse compared to 2% of the males. Willingness to answer questions about sexual experiences varied with the question and increased with age. Prepubertal sexual activity is a more common phenomenon than is generally acknowledged. To what extent the experiences reported in our study represent the norm for behavior among individuals of similar background requires further study.
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Affiliation(s)
- F T Weber
- Department of Pediatrics, College of Medicine, University of Florida, Gainesville 32610
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Davis AB. Anesthetist and anesthesiologist: technology in the social context of a medical and nursing specialty. Trans Stud Coll Physicians Phila 1989; 11:123-34. [PMID: 2665216] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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Davis AB, Dammann G, Glenner RA. Illinois dentists in defense of their country. Ill Dent J 1989; 58:10-4. [PMID: 2689324] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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Glenner RA, Davis AB. On the teaching of dental history. Bull Hist Dent 1988; 36:139-49. [PMID: 3248227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Davis AB. "The Healing Arts in Early America"--Fraunces Tavern Museum, New York. Technol Cult 1987; 28:333-336. [PMID: 11612124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Davis AB, Foster PH, Whitworth JM. Medical foster family care: a cost-effective solution to a community problem. Child Welfare 1984; 63:341-349. [PMID: 6430655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
In response to the special needs of a small number of abused and neglected children who were being cared for by unnecessary extended hospitalization, a medical foster family care program was established, at much lower cost, to provide the children with a home environment and assist their parents so that family reunification was possible.
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Davis AB. Silent sleep. Essay review. Bull Hist Med 1984; 58:111-114. [PMID: 6370343] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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Davis AB. The development of anesthesia. Am Sci 1982; 70:522-8. [PMID: 6756231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Davis AB. Life insurance and the physical examination: a chapter in the rise of American medical technology. Bull Hist Med 1981; 55:392-406. [PMID: 7037084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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35
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Davis AB. Slides and Microtomes:
A History of Microtechnique
. Brian Bracegirdle. Cornell University Press, Ithaca, N.Y., 1978. xvi, 360 pp., illus. $47.50. Science 1979; 204:748-9. [PMID: 17840245 DOI: 10.1126/science.204.4394.748] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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Davis AB. Historical studies of medical instruments. Hist Sci 1978; 16:107-133. [PMID: 11610385 DOI: 10.1177/007327537801600203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Abstract
An unusual case of basal cell carcinoma of the nipple from a 66-year-old women is presented. It is important to differentiate this lesion from other nipple-areolar tumors, especially Paget's disease. This report reviews the literature and adds a case that represents the third reported instance of this tumor of the female nipple.
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Sokal MM, Davis AB, Merzbach UC. A national inventory of historic psychological apparatus. J Hist Behav Sci 1975; 11:284-286. [PMID: 11609841 DOI: 10.1002/1520-6696(197507)11:3<284::aid-jhbs2300110308>3.0.co;2-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Davis AB, Harbers LH. Hydrolysis of sorghum grain starch by rumen microorganisms and purified porcine alpha-amylase as observed by scanning electron microscopy. J Anim Sci 1974; 38:900-7. [PMID: 4823199 DOI: 10.2527/jas1974.384900x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
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Davis AB. Methods for the Determination of Milk Solids in Mixed Feeds. J AOAC Int 1928. [DOI: 10.1093/jaoac/11.3.410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- A B Davis
- The Hilton-Davis Co., Research Laboratories, Cincinnati, Ohio, in collaboration with The Collis Products ...... Company, Clinton, Iowa
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