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Diprose JA, Richardson V, Regan P, Roberts A, Burdin S, Tsikritea A, Mavrokoridis K, Heazlewood BR. Spatial and Temporal Detection of Ions Ejected from Coulomb Crystals. J Phys Chem A 2024. [PMID: 38588488 DOI: 10.1021/acs.jpca.3c08132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/10/2024]
Abstract
Coulomb crystals have proven to be powerful and versatile tools for the study of ion-molecule reactions under cold and controlled conditions. Reactions in Coulomb crystals are typically monitored through a combination of in situ fluorescence imaging of the laser-cooled ions and destructive time-of-flight mass spectrometry measurements of the ejected ions. However, neither of these techniques is able to provide direct structural information on the positions of nonfluorescing "dark" ions within the crystal. In this work, structural information is obtained using a phosphor screen and a microchannel plate detector in conjunction with a Timepix3 camera. The Timepix3 camera simultaneously records the spatial and temporal distribution of all ions that strike the phosphor screen detector following crystal ejection at a selected reaction time. A direct comparison can be made between the observed Timepix3 ion distributions and the distributions established from SIMION simulations of the ion trajectories through the apparatus and onto the detector. Quantitative agreement is found between the measured Timepix3 signal and the properties of Coulomb crystals assigned using fluorescence imaging─independently confirming that the positions and numbers of nonfluorescing ions within Coulomb crystals can be accurately determined using molecular dynamics simulations. It is anticipated that the combination of high-resolution spatial and temporal data will facilitate new measurements of the ion properties within Coulomb crystals.
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Affiliation(s)
- Jake A Diprose
- Department of Physics, University of Liverpool, Liverpool L69 7ZE, U.K
| | | | - Paul Regan
- Department of Physics, University of Liverpool, Liverpool L69 7ZE, U.K
| | - Adam Roberts
- Department of Physics, University of Liverpool, Liverpool L69 7ZE, U.K
| | - Sergey Burdin
- Department of Physics, University of Liverpool, Liverpool L69 7ZE, U.K
| | - Andriana Tsikritea
- Department of Physics, University of Liverpool, Liverpool L69 7ZE, U.K
- Department of Physics, TU Dortmund, Dortmund 44227, Germany
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Richardson V, Polášek M, Romanzin C, Tosi P, Thissen R, Alcaraz C, Žabka J, Ascenzi D. Reactivity of the Ethenium Cation (C 2H 5+) with Ethyne (C 2H 2): A Combined Experimental and Theoretical Study. Molecules 2024; 29:810. [PMID: 38398562 PMCID: PMC10892252 DOI: 10.3390/molecules29040810] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Revised: 01/24/2024] [Accepted: 01/29/2024] [Indexed: 02/25/2024] Open
Abstract
The gas-phase reaction between the ethyl cation (C2H5+) and ethyne (C2H2) is re-investigated by measuring absolute reactive cross sections (CSs) and branching ratios (BRs) as a function of collision energy, in the thermal and hyperthermal energy range, via tandem-guided ion beam mass spectrometry under single collision conditions. Dissociative photoionization of C2H5Br using tuneable VUV radiation in the range 10.5-14.0 eV is employed to generate C2H5+, which has also allowed us to explore the impact of increasing (vibrational) excitation on the reactivity. Reactivity experiments are complemented by theoretical calculations, at the G4 level of theory, of the relative energies and structures of the most relevant stationary points on the reactive potential energy hypersurface (PES) and by mass-analyzed ion kinetic energy (MIKE) spectrometry experiments to probe the metastable decomposition from the [C4H7]+ PES and elucidate the underlying reaction mechanisms. Two main product channels have been identified at a centre-of-mass collision energy of ∼0.1 eV: (a) C3H3++CH4, with BR = 0.76±0.05 and (b) C4H5++H2, with BR = 0.22±0.02. A third channel giving C2H3+ in association with C2H4 is shown to emerge at both high internal excitation of C2H5+ and high collision energies. From CS measurements, energy-dependent total rate constants in the range 4.3×10-11-5.2×10-10 cm3·molecule-1·s-1 have been obtained. Theoretical calculations indicate that both channels stem from a common covalently bound intermediate, CH3CH2CHCH+, from which barrierless and exothermic pathways exist for the production of both cyclic c-C3H3+ and linear H2CCCH+ isomers of the main product channel. For the minor C4H5+ product, two isomers are energetically accessible: the three-member cyclic isomer c-C3H2(CH3)+ and the higher energy linear structure CH2CHCCH2+, but their formation requires multiple isomerization steps and passages via transition states lying only 0.11 eV below the reagents' energy, thus explaining the smaller BR. Results have implications for the modeling of hydrocarbon chemistry in the interstellar medium and the atmospheres of planets and satellites as well as in laboratory plasmas (e.g., plasma-enhanced chemical vapor deposition of carbon nanotubes and diamond-like carbon films).
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Affiliation(s)
- Vincent Richardson
- Department of Physics, University of Trento, 38123 Trento, Italy; (V.R.); (P.T.)
- Department of Physics, University of Liverpool, Oxford Street, Liverpool L69 7ZE, UK
| | - Miroslav Polášek
- J. Heyrovský Institute of Physical Chemistry of the Czech Academy of Sciences, Dolejšškova 2155/3, 182 23 Prague, Czech Republic; (M.P.); (J.Ž.)
| | - Claire Romanzin
- Université Paris-Saclay, CNRS, Institut de Chimie Physique, UMR8000, 91405 Orsay, France; (C.R.); (R.T.); (C.A.)
- Synchrotron Soleil, L’Orme des Merisiers, 91190 Saint-Aubin, France
| | - Paolo Tosi
- Department of Physics, University of Trento, 38123 Trento, Italy; (V.R.); (P.T.)
| | - Roland Thissen
- Université Paris-Saclay, CNRS, Institut de Chimie Physique, UMR8000, 91405 Orsay, France; (C.R.); (R.T.); (C.A.)
- Synchrotron Soleil, L’Orme des Merisiers, 91190 Saint-Aubin, France
| | - Christian Alcaraz
- Université Paris-Saclay, CNRS, Institut de Chimie Physique, UMR8000, 91405 Orsay, France; (C.R.); (R.T.); (C.A.)
- Synchrotron Soleil, L’Orme des Merisiers, 91190 Saint-Aubin, France
| | - Ján Žabka
- J. Heyrovský Institute of Physical Chemistry of the Czech Academy of Sciences, Dolejšškova 2155/3, 182 23 Prague, Czech Republic; (M.P.); (J.Ž.)
| | - Daniela Ascenzi
- Department of Physics, University of Trento, 38123 Trento, Italy; (V.R.); (P.T.)
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Richardson V, Valença Ferreira de Aragão E, He X, Pirani F, Mancini L, Faginas-Lago N, Rosi M, Martini LM, Ascenzi D. Fragmentation of interstellar methanol by collisions with He˙ +: an experimental and computational study. Phys Chem Chem Phys 2022; 24:22437-22452. [PMID: 36102850 DOI: 10.1039/d2cp02458f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Methanol is a key species in astrochemistry as its presence and reactivity provides a primary route to the synthesis of more complex interstellar organic molecules (iCOMs) that may eventually be incorporated in newly formed planetary systems. In the interstellar medium, methanol is formed by hydrogenation of CO ices on grains, and its fate upon collisions with interstellar ions should be accounted for to correctly model iCOM abundances in objects at various stages of stellar evolution. The absolute cross sections (CSs) and branching ratios (BRs) for the collisions of He˙+ ions with CH3OH are measured, as a function of the collision energy, using a Guided Ion Beam Mass Spectrometer (GIB-MS). Insights into the dissociative electron (charge) exchange mechanism have been obtained by computing the entrance and exit multidimensional Potential Energy Surfaces (PESs) and by modelling the non-adiabatic transitions using an improved Landau-Zener-Stückelberg approach. Notably, the dynamical treatment reproducing the experimental findings includes a strong orientation effect of the system formed by the small He˙+ ion and the highly polar CH3OH molecule, in the electric field gradient associated to the strongly anisotropic intermolecular interaction. This is a stereodynamical effect that plays a fundamental role in collision events occurring under a variety of conditions, with kinetic energy confined within intervals ranging from the sub-thermal to the hyper-thermal regime.
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Affiliation(s)
| | - Emília Valença Ferreira de Aragão
- Department of Chemistry, Biology and Biotechnology, Università degli studi di Perugia, Perugia, Italy.,Master-Tec s.r.l., Via Sicilia 41, Perugia, Italy
| | - Xiao He
- Department of Physics, University of Trento, Trento, Italy.
| | - Fernando Pirani
- Department of Chemistry, Biology and Biotechnology, Università degli studi di Perugia, Perugia, Italy.,Department of Civil and Environmental Engineering, Università degli studi di Perugia, Perugia, Italy
| | - Luca Mancini
- Department of Chemistry, Biology and Biotechnology, Università degli studi di Perugia, Perugia, Italy
| | - Noelia Faginas-Lago
- Department of Chemistry, Biology and Biotechnology, Università degli studi di Perugia, Perugia, Italy.,Master-Tec s.r.l., Via Sicilia 41, Perugia, Italy
| | - Marzio Rosi
- Department of Civil and Environmental Engineering, Università degli studi di Perugia, Perugia, Italy
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Richardson DR, Azad MG, Afroz R, Richardson V, Dharmasivam M. Thiosemicarbazones reprogram pancreatic cancer bidirectional oncogenic signaling between cancer cells and stellate cells to suppress desmoplasia. Future Med Chem 2022; 14:1005-1017. [PMID: 35670251 DOI: 10.4155/fmc-2022-0050] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [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] [Indexed: 12/17/2023] Open
Abstract
Standard treatments have shown dismal activity against pancreatic cancer (PC), due in part to the development of a dense stroma (desmoplasia). This perspective discusses the development of the di-2-pyridylketone thiosemicarbazones that overcomes bidirectional oncogenic signaling between PC cells and pancreatic stellate cells (PSCs), which is critical for desmoplasia development. This activity is induced by the up-regulation of the metastasis suppressor, N-myc downstream-regulated gene-1 (NDRG1), which inhibits oncogenic signaling via HGF, IGF-1 and Sonic Hedgehog pathway. More recent studies have deciphered additional pathways including those mediated by Wnt and tenascin C that are secreted by PSCs to activate β-catenin and YAP/TAZ signaling in PC cells. Suppression of bidirectional signaling between cell types presents a unique therapeutic opportunity.
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Affiliation(s)
- D R Richardson
- Centre for Cancer Cell Biology & Drug Discovery, Griffith Institute of Drug Discovery, Griffith University & School of Environment & Science (N34), Nathan, Brisbane, Queensland, 4111, Australia
- Department of Pathology & Biological Responses, Nagoya University Graduate School of Medicine, Nagoya, 466-8550, Japan
| | - M Gholam Azad
- Centre for Cancer Cell Biology & Drug Discovery, Griffith Institute of Drug Discovery, Griffith University & School of Environment & Science (N34), Nathan, Brisbane, Queensland, 4111, Australia
| | - R Afroz
- Centre for Cancer Cell Biology & Drug Discovery, Griffith Institute of Drug Discovery, Griffith University & School of Environment & Science (N34), Nathan, Brisbane, Queensland, 4111, Australia
| | - V Richardson
- Centre for Cancer Cell Biology & Drug Discovery, Griffith Institute of Drug Discovery, Griffith University & School of Environment & Science (N34), Nathan, Brisbane, Queensland, 4111, Australia
| | - M Dharmasivam
- Centre for Cancer Cell Biology & Drug Discovery, Griffith Institute of Drug Discovery, Griffith University & School of Environment & Science (N34), Nathan, Brisbane, Queensland, 4111, Australia
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Sundelin D, Ascenzi D, Richardson V, Alcaraz C, Polášek M, Romanzin C, Thissen R, Tosi P, Žabka J, Geppert W. The reactivity of methanimine radical cation (H2CNH•+) and its isomer aminomethylene (HCNH2•+) with C2H4. Chem Phys Lett 2021. [DOI: 10.1016/j.cplett.2021.138677] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Ma L, Gholam Azad M, Dharmasivam M, Richardson V, Quinn RJ, Feng Y, Pountney DL, Tonissen KF, Mellick GD, Yanatori I, Richardson DR. Parkinson's disease: Alterations in iron and redox biology as a key to unlock therapeutic strategies. Redox Biol 2021; 41:101896. [PMID: 33799121 PMCID: PMC8044696 DOI: 10.1016/j.redox.2021.101896] [Citation(s) in RCA: 56] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2020] [Revised: 02/05/2021] [Accepted: 02/09/2021] [Indexed: 12/13/2022] Open
Abstract
A plethora of studies indicate that iron metabolism is dysregulated in Parkinson's disease (PD). The literature reveals well-documented alterations consistent with established dogma, but also intriguing paradoxical observations requiring mechanistic dissection. An important fact is the iron loading in dopaminergic neurons of the substantia nigra pars compacta (SNpc), which are the cells primarily affected in PD. Assessment of these changes reveal increased expression of proteins critical for iron uptake, namely transferrin receptor 1 and the divalent metal transporter 1 (DMT1), and decreased expression of the iron exporter, ferroportin-1 (FPN1). Consistent with this is the activation of iron regulator protein (IRP) RNA-binding activity, which is an important regulator of iron homeostasis, with its activation indicating cytosolic iron deficiency. In fact, IRPs bind to iron-responsive elements (IREs) in the 3ꞌ untranslated region (UTR) of certain mRNAs to stabilize their half-life, while binding to the 5ꞌ UTR prevents translation. Iron loading of dopaminergic neurons in PD may occur through these mechanisms, leading to increased neuronal iron and iron-mediated reactive oxygen species (ROS) generation. The "gold standard" histological marker of PD, Lewy bodies, are mainly composed of α-synuclein, the expression of which is markedly increased in PD. Of note, an atypical IRE exists in the α-synuclein 5ꞌ UTR that may explain its up-regulation by increased iron. This dysregulation could be impacted by the unique autonomous pacemaking of dopaminergic neurons of the SNpc that engages L-type Ca+2 channels, which imparts a bioenergetic energy deficit and mitochondrial redox stress. This dysfunction could then drive alterations in iron trafficking that attempt to rescue energy deficits such as the increased iron uptake to provide iron for key electron transport proteins. Considering the increased iron-loading in PD brains, therapies utilizing limited iron chelation have shown success. Greater therapeutic advancements should be possible once the exact molecular pathways of iron processing are dissected.
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Affiliation(s)
- L Ma
- School of Environment and Science, Griffith University Nathan, Brisbane, Queensland, Australia; Griffith Institute for Drug Discovery, Griffith University, Nathan, Brisbane, Queensland, Australia
| | - M Gholam Azad
- School of Environment and Science, Griffith University Nathan, Brisbane, Queensland, Australia; Griffith Institute for Drug Discovery, Griffith University, Nathan, Brisbane, Queensland, Australia; Centre for Cancer Cell Biology and Drug Discovery, Griffith Institute for Drug Discovery, Griffith University, Nathan, Brisbane, Queensland, Australia
| | - M Dharmasivam
- School of Environment and Science, Griffith University Nathan, Brisbane, Queensland, Australia; Griffith Institute for Drug Discovery, Griffith University, Nathan, Brisbane, Queensland, Australia; Centre for Cancer Cell Biology and Drug Discovery, Griffith Institute for Drug Discovery, Griffith University, Nathan, Brisbane, Queensland, Australia
| | - V Richardson
- School of Environment and Science, Griffith University Nathan, Brisbane, Queensland, Australia; Griffith Institute for Drug Discovery, Griffith University, Nathan, Brisbane, Queensland, Australia; Centre for Cancer Cell Biology and Drug Discovery, Griffith Institute for Drug Discovery, Griffith University, Nathan, Brisbane, Queensland, Australia
| | - R J Quinn
- Griffith Institute for Drug Discovery, Griffith University, Nathan, Brisbane, Queensland, Australia
| | - Y Feng
- School of Environment and Science, Griffith University Nathan, Brisbane, Queensland, Australia; Griffith Institute for Drug Discovery, Griffith University, Nathan, Brisbane, Queensland, Australia
| | - D L Pountney
- School of Medical Science, Griffith University, Gold Coast, Queensland, Australia
| | - K F Tonissen
- School of Environment and Science, Griffith University Nathan, Brisbane, Queensland, Australia; Griffith Institute for Drug Discovery, Griffith University, Nathan, Brisbane, Queensland, Australia
| | - G D Mellick
- School of Environment and Science, Griffith University Nathan, Brisbane, Queensland, Australia; Griffith Institute for Drug Discovery, Griffith University, Nathan, Brisbane, Queensland, Australia
| | - I Yanatori
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Nagoya, 466-8550, Japan
| | - D R Richardson
- School of Environment and Science, Griffith University Nathan, Brisbane, Queensland, Australia; Griffith Institute for Drug Discovery, Griffith University, Nathan, Brisbane, Queensland, Australia; Centre for Cancer Cell Biology and Drug Discovery, Griffith Institute for Drug Discovery, Griffith University, Nathan, Brisbane, Queensland, Australia; Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Nagoya, 466-8550, Japan.
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Torres-Poveda K, Ruiz-Fraga I, Madrid-Marina V, Chavez M, Richardson V. High risk HPV infection prevalence and associated cofactors: a population-based study in female ISSSTE beneficiaries attending the HPV screening and early detection of cervical cancer program. BMC Cancer 2019; 19:1205. [PMID: 31823749 PMCID: PMC6905062 DOI: 10.1186/s12885-019-6388-4] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2018] [Accepted: 11/21/2019] [Indexed: 01/22/2023] Open
Abstract
BACKGROUND Cervical cancer is the second cause leading of malignancy-related death among Mexican women. The present study determined the population-based prevalence of high risk Human Papillomavirus (HR-HPV) infection and associated cofactors in female beneficiaries of the Institute of Security and Social Services for State Workers (ISSSTE) attending the Program for HPV Screening and Early Detection of Cervical Cancer and registered in the Women's Cancer Detection System (SIDECAM). METHODS In a cross-sectional study, cervical samples from 115,651 female users of the program for HPV screening and early detection of cervical cancer recruited in 23 ISSSTE care centers were analyzed for HR-HPV. Logistic regression analyses, adjusting for potential confounders, were performed to determine the association of HR-HPV infection with sexual health and behavior variables and with positivity to cervical premalignant lesions by cytology. RESULTS The overall prevalence of HR-HPV infection among female ISSSTE beneficiaries in the 2013-2015 period was 13%. A bivariate analysis of relevant variables for HR-HPV infection showed a statistically significant association for age, number of sexual partners, use of hormonal contraceptives and smoking. A statistical association was found between infection by HR-HPV with the use of hormonal contraceptives, number of sexual partners and smoking and association of HPV 16 and other non-16/18 HR-HPV infection with number of lifetime sexual partners and tobacco use adjusted for age, history of hormonal contraception, number of sexual partners and tobacco use with the exception of exposition variable itself. Similarly, an association was found between HR-HPV infection, regardless of the virus genotype, with positivity to cervical premalignant lesions adjusted for age, number of lifetime sexual partners, history of hormonal contraception and tobacco use. CONCLUSIONS HR-HPV prevalence in female ISSSTE Women's Cancer Program users is similar to the population-based prevalence previously reported in Mexican women without cervical alterations. The ISSSTE robust screening and early detection program, based on cytology studies and HPV co-testing, allows us to know the prevalence of HR-HPV infection among female users of the service.
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Affiliation(s)
- K Torres-Poveda
- Dirección de Infecciones Crónicas y Cáncer, Centro de Investigación sobre Enfermedades Infecciosas, Instituto Nacional de Salud Pública (INSP), Av. Universidad 655, Santa María Ahuacatitlán, Cuernavaca, 62100, Cuernavaca, Mexico. .,CONACYT-INSP, Cuernavaca, Morelos, Mexico.
| | - I Ruiz-Fraga
- Subdirección de Prevención y Protección a la Salud, Instituto de Seguridad y Servicios Sociales de los Trabajadores del Estado, (ISSSTE) Cd, Mexico, Mexico
| | - V Madrid-Marina
- Dirección de Infecciones Crónicas y Cáncer, Centro de Investigación sobre Enfermedades Infecciosas, Instituto Nacional de Salud Pública (INSP), Av. Universidad 655, Santa María Ahuacatitlán, Cuernavaca, 62100, Cuernavaca, Mexico
| | - M Chavez
- Subdirección de Prevención y Protección a la Salud, Instituto de Seguridad y Servicios Sociales de los Trabajadores del Estado, (ISSSTE) Cd, Mexico, Mexico
| | - V Richardson
- Subdirección de Prevención y Protección a la Salud, Instituto de Seguridad y Servicios Sociales de los Trabajadores del Estado, (ISSSTE) Cd, Mexico, Mexico
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Köckert H, Heathcote D, Lee JWL, Zhou W, Richardson V, Vallance C. C–I and C–F bond-breaking dynamics in the dissociative electron ionization of CF3I. Phys Chem Chem Phys 2019; 21:14296-14305. [DOI: 10.1039/c8cp06682e] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We present a comprehensive experimental study into the dissociative electron ionization dynamics of CF3I at energies ranging from 20 to 100 eV.
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Affiliation(s)
- Hansjochen Köckert
- Department of Chemistry
- University of Oxford
- Chemistry Research Laboratory
- Oxford OX1 3TA
- UK
| | - David Heathcote
- Department of Chemistry
- University of Oxford
- Chemistry Research Laboratory
- Oxford OX1 3TA
- UK
| | - Jason W. L. Lee
- Department of Chemistry
- University of Oxford
- Chemistry Research Laboratory
- Oxford OX1 3TA
- UK
| | - Weiwei Zhou
- Department of Chemistry
- University of Oxford
- Chemistry Research Laboratory
- Oxford OX1 3TA
- UK
| | - Vincent Richardson
- Department of Chemistry
- University of Oxford
- Chemistry Research Laboratory
- Oxford OX1 3TA
- UK
| | - Claire Vallance
- Department of Chemistry
- University of Oxford
- Chemistry Research Laboratory
- Oxford OX1 3TA
- UK
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Fullen M, Richardson V. COMPARING SUCCESSFUL AGING, RESILIENCE, AND HOLISTIC WELLNESS AS PREDICTORS OF THE GOOD LIFE. Innov Aging 2018. [DOI: 10.1093/geroni/igy023.591] [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: 11/12/2022] Open
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Lok HC, Sahni S, Richardson V, Kalinowski DS, Kovacevic Z, Lane DJR, Richardson DR. Glutathione S-transferase and MRP1 form an integrated system involved in the storage and transport of dinitrosyl-dithiolato iron complexes in cells. Free Radic Biol Med 2014; 75:14-29. [PMID: 25035074 DOI: 10.1016/j.freeradbiomed.2014.07.002] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/27/2014] [Revised: 06/26/2014] [Accepted: 07/01/2014] [Indexed: 12/11/2022]
Abstract
Nitrogen monoxide (NO) is vital for many essential biological processes as a messenger and effector molecule. The physiological importance of NO is the result of its high affinity for iron in the active sites of proteins such as guanylate cyclase. Indeed, NO possesses a rich coordination chemistry with iron and the formation of dinitrosyl-dithiolato iron complexes (DNICs) is well documented. In mammals, NO generated by cytotoxic activated macrophages has been reported to play a role as a cytotoxic effector against tumor cells by binding and releasing intracellular iron. Studies from our laboratory have shown that two proteins traditionally involved in drug resistance, namely multidrug-resistance protein 1 and glutathione S-transferase, play critical roles in intracellular NO transport and storage through their interaction with DNICs (R.N. Watts et al., Proc. Natl. Acad. Sci. USA 103:7670-7675, 2006; H. Lok et al., J. Biol. Chem. 287:607-618, 2012). Notably, DNICs are present at high concentrations in cells and are biologically available. These complexes have a markedly longer half-life than free NO, making them an ideal "common currency" for this messenger molecule. Considering the many critical roles NO plays in health and disease, a better understanding of its intracellular trafficking mechanisms will be vital for the development of new therapeutics.
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Affiliation(s)
- H C Lok
- Molecular Pharmacology and Pathology Program, Department of Pathology and Bosch Institute, University of Sydney, Sydney, NSW 2006, Australia
| | - S Sahni
- Molecular Pharmacology and Pathology Program, Department of Pathology and Bosch Institute, University of Sydney, Sydney, NSW 2006, Australia
| | - V Richardson
- Molecular Pharmacology and Pathology Program, Department of Pathology and Bosch Institute, University of Sydney, Sydney, NSW 2006, Australia
| | - D S Kalinowski
- Molecular Pharmacology and Pathology Program, Department of Pathology and Bosch Institute, University of Sydney, Sydney, NSW 2006, Australia
| | - Z Kovacevic
- Molecular Pharmacology and Pathology Program, Department of Pathology and Bosch Institute, University of Sydney, Sydney, NSW 2006, Australia
| | - D J R Lane
- Molecular Pharmacology and Pathology Program, Department of Pathology and Bosch Institute, University of Sydney, Sydney, NSW 2006, Australia
| | - D R Richardson
- Molecular Pharmacology and Pathology Program, Department of Pathology and Bosch Institute, University of Sydney, Sydney, NSW 2006, Australia.
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Abstract
The safeguarding of patients is a key concern for all health and care professionals. Research shows that more instances of unacceptable care are likely to occur due to an increase in population of those deemed to be vulnerable. Increasing professionals' awareness, knowledge and understanding of safeguarding and of the systems in place for reporting concerns is essential for best practice and for protecting patients and their families.
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Idris LO, Richardson V, Johnson I, Sobrany G, Babu KS. M16 Staff-Patient perception of discomfort with fibre-optic bronchoscopy-Is there a correlation? Thorax 2013. [DOI: 10.1136/thoraxjnl-2013-204457.426] [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: 11/04/2022]
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Richardson V, Costello JT, Cubaynes D, Düsterer S, Feldhaus J, van der Hart HW, Juranić P, Li WB, Meyer M, Richter M, Sorokin AA, Tiedke K. Two-photon inner-shell ionization in the extreme ultraviolet. Phys Rev Lett 2010; 105:013001. [PMID: 20867437 DOI: 10.1103/physrevlett.105.013001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2010] [Indexed: 05/29/2023]
Abstract
We have observed the simultaneous inner-shell absorption of two extreme-ultraviolet photons by a Xe atom in an experiment performed at the short-wavelength free electron laser facility FLASH. Photoelectron spectroscopy permitted us to unambiguously identify a feature resulting from the ionization of a single electron of the 4d subshell of Xe by two photons each of energy (93±1) eV. The feature's intensity has a quadratic dependence on the pulse energy. The results are discussed and interpreted within the framework of recent results of ion spectroscopy experiments of Xe obtained at ultrahigh irradiance in the extreme-ultraviolet regime.
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Affiliation(s)
- V Richardson
- School of Physical Sciences and NCPST, Dublin City University, Dublin 9, Ireland
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Meyer M, Cubaynes D, Richardson V, Costello JT, Radcliffe P, Li WB, Düsterer S, Fritzsche S, Mihelic A, Papamihail KG, Lambropoulos P. Two-photon excitation and relaxation of the 3d-4d resonance in atomic Kr. Phys Rev Lett 2010; 104:213001. [PMID: 20867092 DOI: 10.1103/physrevlett.104.213001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2010] [Indexed: 05/29/2023]
Abstract
Two-photon excitation of a single-photon forbidden Auger resonance has been observed and investigated using the intense extreme ultraviolet radiation from the free electron laser in Hamburg. At the wavelength 26.9 nm (46 eV) two photons promoted a 3d core electron to the outer 4d shell. The subsequent Auger decay, as well as several nonlinear above threshold ionization processes, were studied by electron spectroscopy. The experimental data are in excellent agreement with theoretical predictions and analysis of the underlying multiphoton processes.
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Affiliation(s)
- M Meyer
- LIXAM, UMR 8624, CNRS-Université Paris Sud, Bâtiment 350, F-91405 Orsay Cedex, France
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Wong HS, Kidd A, Zuccollo J, Parker S, Richardson V, Tait J, Pringle KC. A case of amyoplasia in a monochorionic twin pregnancy: a sequela from twin-twin transfusion syndrome? Fetal Diagn Ther 2009; 25:31-5. [PMID: 19153494 DOI: 10.1159/000193224] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2007] [Accepted: 01/17/2008] [Indexed: 11/19/2022]
Abstract
OBJECTIVE To present and discuss the sonographic and clinical findings in one twin of a monochorionic pair affected by amyoplasia. METHODS On ultrasound examination at 21 weeks in a monochorionic twin pregnancy, twin I was smaller, hydropic, with multiple contractures consistent with amyoplasia and oligohydramnios. Twin II was anatomically normal with polyhydramnios. RESULTS The twins were delivered at 28 weeks' gestation. The clinical findings were consistent with twin-twin transfusion syndrome (TTTS). CONCLUSION It is postulated that TTTS may be a causative factor in the excessive incidence of amyoplasia in monozygotic twin pregnancy.
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Affiliation(s)
- H S Wong
- Australian Women's Ultrasound Centre, Brisbanne, Qld., Australia.
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Meyer M, Cubaynes D, Glijer D, Dardis J, Hayden P, Hough P, Richardson V, Kennedy ET, Costello JT, Radcliffe P, Düsterer S, Azima A, Li WB, Redlin H, Feldhaus J, Taïeb R, Maquet A, Grum-Grzhimailo AN, Gryzlova EV, Strakhova SI. Polarization control in two-color above-threshold ionization of atomic helium. Phys Rev Lett 2008; 101:193002. [PMID: 19113264 DOI: 10.1103/physrevlett.101.193002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2008] [Indexed: 05/27/2023]
Abstract
Two-color multiphoton ionization of atomic helium was investigated by combining extreme ultraviolet (XUV) radiation from the Free Electron Laser in Hamburg with an intense synchronized optical laser. In the photoelectron spectrum, lines associated with direct ionization and above-threshold ionization show strong variations of their amplitudes as a function of both the intensity of the optical dressing field and the relative orientation of the linear polarization vectors of the two fields. The polarization dependence provides direct insight into the symmetry of the outgoing electrons in above-threshold ionization. In the high field regime, the monochromaticity of the XUV radiation enables the unperturbed observation of nonlinear processes in the optical field.
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Affiliation(s)
- M Meyer
- LIXAM, UMR 8624, CNRS-Université Paris Sud, Bâtiment 350, 91405 Orsay Cedex, France
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McGee BB, Simpson PM, Gossett JM, Johnson GS, Thornton A, Richardson V, Johnson C, Bogle ML. Food choices, health behavior, and risk factors for hypertension and diabetes among Lower Mississippi Delta Residents. FASEB J 2007. [DOI: 10.1096/fasebj.21.6.a1051-b] [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: 11/11/2022]
Affiliation(s)
| | - P. M. Simpson
- Arkansas Children’s Hospital Research Institute1120 Marshall St., Slot 512‐43Little RockAR72202
| | - J. M. Gossett
- Arkansas Children’s Hospital Research Institute1120 Marshall St., Slot 512‐43Little RockAR72202
| | - G. S. Johnson
- Southern University and A & M CollegeE. C. Harrison DriveBaton RougeLA70813
| | - A. Thornton
- Southern University and A & M CollegeE. C. Harrison DriveBaton RougeLA70813
| | - V. Richardson
- Southern University and A & M CollegeE. C. Harrison DriveBaton RougeLA70813
| | - C. Johnson
- Southern University and A & M CollegeE. C. Harrison DriveBaton RougeLA70813
| | - M. L. Bogle
- USDA, ARS, SPA, Delta NIRI900 S. Shackleford Road, Suite 509Little RockAR72211
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Vogel AM, Lennon DR, Broadbent R, Byrnes CA, Grimwood K, Mildenhall L, Richardson V, Rowley S. Palivizumab prophylaxis of respiratory syncytial virus infection in high-risk infants. J Paediatr Child Health 2002; 38:550-4. [PMID: 12410864 DOI: 10.1046/j.1440-1754.2002.00057.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [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: 11/20/2022]
Abstract
Palivizumab prophylaxis significantly reduces hospitalization for respiratory syncytial virus (RSV) disease in preterm infants. However, palivizumab is very expensive. Data from a New Zealand cost-effectiveness analysis were considered by representatives of the Infectious Diseases and Immunisation, Fetus and Newborn, and Respiratory Committees of the Paediatric Society of New Zealand. Prophylaxis in all high-risk groups was associated with net cost. The consensus panel recommends that the priority for palivizumab be given to babies discharged on home oxygen with chronic lung disease, followed by babies born at 28 weeks or less gestation.
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Affiliation(s)
- A M Vogel
- University of Auckland, Wellington, New Zealand.
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Sutton L, Bajuk B, Berry G, Sayer GP, Richardson V, Henderson-Smart DJ. Score of neonatal acute physiology as a measure of illness severity in mechanically ventilated term babies. Acta Paediatr 2002; 91:415-23. [PMID: 12061357 DOI: 10.1080/080352502317371652] [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: 09/30/2022]
Abstract
UNLABELLED The objectives of this population-based, case-control cohort study were to describe the use of the score of neonatal acute physiology (SNAP) as a measure of illness severity in mechanically ventilated term infants, to compare the SNAP scores of the different diagnostic groups, to assess the contribution of the individual SNAP items to the overall SNAP severity category, and to assess SNAP as a predictor of mortality and neonatal intensive care unit (NICU) resource utilization (length of stay (LOS) and duration of ventilation (LOV)). The study was carried out in Sydney and four large rural/urban health areas in New South Wales, Australia. The subjects--182 singleton term infants with no major congenital anomalies--were admitted to a tertiary NICU for mechanical ventilation. Highest mean (SD) SNAP scores occurred in infants ventilated for meconium aspiration (18 (9)), and perinatal asphyxia (17 (9)), compared with pulmonary hypertension (14 (6)) and respiratory distress syndrome (13 (5)). The individual SNAP items that contributed most to SNAP moderate and severe categories were blood gas items, creatinine, urine output, blood glucose, and seizures. Predictors of death included total SNAP score, individual SNAP items (urine output, pH, Oxygenation Index (OI)), 5-min Apgar, gestational age >40 wk, growth restriction, and ventilation for asphyxia/apnoea. SNAP alone was not a good predictor of NICU resource utilization (LOS, LOV) in term infants. The best predictors were LOV for LOS, and a combination of SNAP and the reason for ventilation for LOV. CONCLUSION SNAP is a useful measure of severity of illness in sick term neonates admitted to a tertiary NICU. This measure can be used to predict neonatal morbidity and mortality, and to some extent NICU resource utililization.
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Affiliation(s)
- L Sutton
- New South Wales Neonatal Intensive Care Units' Data Collection, School of Women's and Children's Health, University of New South Wales, Australia.
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Sutton L, Sayer GP, Bajuk B, Richardson V, Berry G, Henderson-Smart DJ. Do very sick neonates born at term have antenatal risks? 1. Infants ventilated primarily for problems of adaptation to extra-uterine life. Acta Obstet Gynecol Scand 2001; 80:905-16. [PMID: 11580735 DOI: 10.1034/j.1600-0412.2001.801007.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
AIMS 1. Ascertain antenatal and intrapartum risk factors for term neonates ventilated primarily for 'perinatal asphyxia'. 2. Describe the neonatal morbidity and mortality. METHODS Population-based case control cohort study. SETTING Sydney and four large rural/urban health areas in New South Wales. SUBJECTS Singleton term infants, no major congenital anomaly: subset of 83 infants ventilated primarily for 'asphyxia' from 182 cases admitted to a tertiary neonatal intensive care unit (NICU) for mechanical ventilation, 550 randomly selected controls. Outcome. Risk factors for case status by maternal, antenatal, labor, delivery, and combined epochs, adjusted odds ratios (OR), 95 per cent confidence intervals (CI), p < 0.05. RESULTS Predictors of case status by multivariate epochs: Primigravida (1.8 [1.1, 2.8]), thyroid disease (7.8 [1.1, 57.0]), any antenatal complication (5.1 [3.0, 8.6]), growth restriction (4.2 [1.7, 10.4]), male gender (2.1 [1.3, 3.5]), gestational age >40 weeks (1.9 (1.1, 3.3)), prolonged rupture of membranes (9.7 [1.3, 72.5]), complicated labor (6.6 [3.7, 11.9]), induced labor (2.2 [1.3, 3.9]), prostaglandins 2.46 [1.23, 4.91]), maternal pyrexia (10.8 [2.8, 42.7]), placental hemorrhage in labor (OR 4.24 [1.45, 12.42]), forceps delivery (4.1 [1.9, 8.5]), emergency cesarean section (4.7 [2.6, 8.7]). Twenty case infants (24%) and no control infants died. CONCLUSIONS This study has shown maternal and antepartum risk factors for severe neonatal morbidity in term infants. More centers need to become interested in the term baby, so that a larger multicenter study can further elucidate the heterogeneous causal pathways to term neonatal morbidity.
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Affiliation(s)
- L Sutton
- New South Wales Neonatal Intensive Care Units' Data Collection (NICUS), University of New South Wales, Australia.
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Sutton L, Sayer GP, Bajuk B, Richardson V, Berry G, Henderson-Smart DJ. Do very sick neonates born at term have antenatal risks? 2. Infants ventilated primarily for lung disease. Acta Obstet Gynecol Scand 2001; 80:917-25. [PMID: 11580736 DOI: 10.1034/j.1600-0412.2001.801008.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
AIMS 1. Ascertain antenatal and intrapartum risk factors for term neonates ventilated primarily for respiratory problems. 2. Describe the neonatal morbidity and mortality. METHODS Population-based case control cohort study. SETTING Sydney and four large rural/urban Health Areas in New South Wales, 1996. SUBJECTS Singleton term infants, no major congenital anomaly: subset of 99 infants ventilated primarily for respiratory problems from 182 cases admitted to a tertiary neonatal intensive care unit (NICU) for mechanical ventilation, and 550 randomly selected controls. OUTCOME Risk factors for case status by maternal, antenatal, labor, delivery, and combined epochs, adjusted Odds Ratios (OR), 95 per cent Confidence Intervals (CI), p<0.05. RESULTS Predictors of case status by multivariate epochs: mother's age > or =35 years (1.9 (1.1, 3.2) p=0.03), primigravida (1.8 (1.1, 2.8) p=0.01), any antenatal complication (3.8 (2.4, 5.9) p=0.0001), birth weight < 3rd percentile (3.7 (1.5, 9.1) p=0.006), gestational diabetes (2.9 (1.3, 6.9) p=0.01), maternal pyrexia (6.5 (1.6, 27.2) p=0.01), birth weight >90th percentile (1.8 (1.01, 3.2) p=0.047), gestation 37-38 weeks (2.3 (1.5, 3.6) p=0.0004), forceps (4.4 (2.1, 9.1) p=0.0001), elective cesarean section (3.7 (2.0, 6.5) p=0.0001), emergency cesarean section (4.5 (2.4, 8.4) p=0.0001). Case mortality rate was 5 per cent. CONCLUSION The pathways to neonatal respiratory morbidity in term infants are multifactorial. Several areas which warrant more in-depth study are: elective cesarean section at 37-38 weeks gestation, fetal growth restriction, macrosomia and the pattern of in-utero growth, maternal weight gain during pregnancy, gestational diabetes, pyrexia in labor and the role of chorioamnionitis.
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Affiliation(s)
- L Sutton
- New South Wales Neonatal Intensive Care Units' Data Collection (NICUS), University of New South Wales, Australia.
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Tuthill D, Elder D, Pringle K, Richardson V, Selby R, Robinson R. Posterior urethral valves: failure of antenatal diagnosis. N Z Med J 2000; 113:333-4. [PMID: 11008610] [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: 02/17/2023]
Affiliation(s)
- D Tuthill
- Department of Paediatrics, University Hospital of Wales, Cardiff
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Abstract
BACKGROUND Women constitute an increasing proportion of physicians in the United States. Historically, inequities have existed between male and female physicians in professional advancement, but evidence has suggested that disparities in salary are resolving. OBJECTIVE To examine the current state of salary equity among male and female internists. DESIGN Population-based survey mailed to all Board-certified female internists and a matched group of male internists who had graduated from medical school 10 to 30 years ago and were currently practicing. SETTING Pennsylvania. PARTICIPANTS 232 male and 213 female internists for whom data were complete. MEASUREMENTS Respondents answered questions about demographic characteristics, training, practice type and setting, status within the practice, family life, and salary. RESULTS Women were more likely to be involved in the least lucrative practice arrangements. They were more likely to be in low-paying specialties, to not be a partner in the practice, and to be salaried employees; they also spent fewer hours per week seeing patients. Even after adjustment for these differences, hourly earnings were significantly higher (14%) among men than among their female colleagues. Men's earnings significantly exceeded women's earnings among physicians with no academic affiliation, those in high-earning specialties, and those in general internal medicine. CONCLUSIONS Significant salary differentials exist between male and female internists overall and in various medical practice settings.
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Affiliation(s)
- R B Ness
- Graduate School of Public Health, University of Pittsburgh, University of Pittsburgh Medical Center, Pennsylvania 15261, USA.
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Kriegerbecková K, Richardson V, Döpper-Brunner L, Chiba P, Kühn LC, Goldenberg H, Kovár J. Transferrin receptor expression is controlled differently by transferrin-bound and non-transferrin iron in human cells. Folia Biol (Praha) 2000; 44:201-6. [PMID: 10730863] [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: 02/15/2023]
Abstract
We studied the effects of iron supplied as transferrin-bound iron and iron supplied as non-transferrin iron on transferrin receptor expression by human cell lines. Defined conditions of iron supply were represented by (i) 5 microg/ml of iron-saturated transferrin (transferrin medium) and by (ii) 500 microM ferric citrate (ferric citrate medium). Transferrin receptor expression of studied cell lines (HeLa, K562, Jiyoye) grown as long-term cultures in transferrin medium was somewhat higher (up to 137% of the mean fluorescence intensity) than in ferric citrate medium. The receptor expression corresponded with cellular iron regulatory protein (IRP) activity (ratio activated/total), which was also higher in transferrin medium (0.69-0.84) than in ferric citrate medium (0.33-0.60). However, unexpectedly much higher (about 65-135-fold) cellular iron levels were found in ferric citrate medium (13.9-14.9 nmol/10(6) cells) than in transferrin medium (0.11-0.21 nmol/10(6) cells). In contrast to the iron levels, cellular ferritin levels of the cells in ferric citrate medium (38.3-130 ng/10(6) cells) were only about 2-7-fold higher than in transferrin medium (6.8-61.5 ng/10(6) cells). We suggest that iron supplied as non-transferrin iron (ferric citrate) is apparently less available for the control of transferrin receptor expression via IRP activity than iron supplied as transferrin.
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Affiliation(s)
- K Kriegerbecková
- Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, Prague
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Ramírez-Zetina M, Richardson V, Avila H, Caraveo VE, Salomón RE, Bacardí M, Jiménez-Cruz A. [Prenatal care in the border city of Tijuana, Mexico]. Rev Panam Salud Publica 2000; 7:97-101. [PMID: 10748660 DOI: 10.1590/s1020-49892000000200005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This study was intended to explore the conditions under which prenatal care is delivered in the border city of Tijuana, Baja California, Mexico, and to assess the possible associations between that care and neonatal results in terms of birthweight, health of the neonate, and prematurity. Seven hospitals serving persons from different socioeconomic strata were chosen, and between December 1993 and March 1994 interviews were conducted with 279 women who were in the first 24 to 48 hours of puerperium. During the interviews data were collected on socioeconomic level; the mothers' knowledge, attitudes, and practices concerning obstetric health; the mothers' perceptions of access to prenatal care; the quality of prenatal care visits (evaluated in terms of having blood and urine tested and weight and blood pressure measured); and the gynecological and obstetric and health history of the mother. A database was created using the SPSS statistics software package. Possible associations were explored, with prenatal care as the independent variable and various dependent variables, by means of contingency tables and a two-tailed Fisher's exact test. None of the neonates was premature, ill, or had a birthweight of < or = 2,500 g. For this reason it was decided to divide the variable corresponding to birthweight into two groupings, < or = 3,000 g and > 3,000 g. A significant (P < 0.00038) relationship was found between a lack of prenatal care and low birthweight. In addition, a lack of prenatal care was associated with: low family income; the mother's financial dependence on the father; the mother being in an unmarried relationship; little communication with the partner; having no medical insurance; an unwanted pregnancy; and giving delivery at the General Hospital. Out of the total sample of 279 women, 15 (5.4%) had received no prenatal care. None of these 15 women reported they had encountered difficulties that prevented them from obtaining prenatal care, but only 7 of those women answered that question. The prenatal care was of good quality in 190 of the cases (68%). Both the number and the timing of the prenatal visits were adequate in 142 of the cases (50%). The mother's having worked during pregnancy or before had a positive predictive value in terms of utilization of prenatal care services. Additional studies are needed to evaluate the possible relationship between domestic violence and the lack of prenatal care or a delay in seeking such care.
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Affiliation(s)
- M Ramírez-Zetina
- Instituto Mexicano del Seguro Social, Tijuana, Baja California, México
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Abstract
BACKGROUND This study explored the students' perspective related to combining traditional and RN student populations in a senior capstone course. METHOD In the final semester in a senior baccalaureate program, nursing students (N = 340) completed an investigator-designed 5-item survey. Data were reviewed independently by three investigators for emergent themes. RESULTS While the course content was applied differently by two student populations, both appreciated a seminar format that allowed increased creativity, autonomy, and flexibility. CONCLUSIONS Merits of an integrated course were more explicitly stated by traditional students, who viewed the RNs as a source of reality-based learning. Faculty sensitivity to the unique learning needs of each student population is recommended.
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Affiliation(s)
- J W Rains
- Indiana University East, Richmond 47374, USA
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Abstract
The aim of this paper is to describe the prevalence and perceptions of pain and pain management amongst hospital in-patients. A cross-sectional descriptive survey of 205 patients was conducted. Presence and severity of pain was assessed using verbal descriptor and visual analogue scales, and perceptions of pain were assessed using multi-item scales. Although the severity of pain reported was consistent across age groups and clinical areas, women in the study sample were significantly more likely to report high levels of pain than men. Differences in how men and women communicate their pain were observed, with women indicating that they were less willing to ask for help with their pain. Results suggest that pain continues to be an important problem for a large number of men and women in hospital, and that the experience of pain impacts negatively upon their well-being. Gender differences in the experience of and response to pain remain important considerations for clinical nurses who have major responsibilities for the management of pain in hospitalized patients.
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Affiliation(s)
- P Yates
- Queensland University of Technology, QLD, Australia
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Riner ME, Mueller C, Ihrke B, Smolen RA, Wilson M, Richardson V, Stone C, Zwirn EE. Computerized NCLEX-RN and NCLEX-PN preparation programs. Comparative review, 1997. Comput Nurs 1997; 15:255-67. [PMID: 9329227] [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: 02/05/2023]
Abstract
The computerized test taking market continues to expand to meet the needs of nursing students studying to prepare for the NCLEX-RN and the NCLEX-PN. In addition, currently registered nurses may choose to use these software programs to review clinical knowledge in areas in which they are not currently practicing. This article reviewed software designed for personal use, review books with complete disks, on-site institutional testing and consultation, and school of nursing LANs. The costs of software for personal use is priced reasonably and provides flexibility for students to use as their schedule permits. The cost of institutional licenses is moderate and most programs provide multiple on-site use rights. The marketplace has responded to the computerized NCLEX testing now in place nationally. As new formats are developed and new uses identified, nursing faculty and students can expect to see an expanded use of computerized testing.
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Affiliation(s)
- M E Riner
- Indiana University School of Nursing, Indianapolis 46202-5107, USA
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Kovár J, Kühn LC, Richardson V, Seiser C, Kriegerbecková K, Musílková J. The inability of cells to grow in low iron correlates with increasing activity of their iron regulatory protein (IRP). In Vitro Cell Dev Biol Anim 1997; 33:633-9. [PMID: 9338146 DOI: 10.1007/s11626-997-0114-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
We studied the factors that determine the differing growth requirements of low-iron-tolerant (LIT) versus high-iron-dependent (HID) cells for extracellular nontransferrin iron. The growth of LIT cells HeLa and THP-1, when transferred from transferrin (5 micrograms/ml) medium into low-iron (5 microM ferric citrate) medium, was not significantly affected while HID cells Jiyoye and K562 showed nearly no growth. HeLa and THP-1 cells, as well as Jiyoye and K562 cells, do not produce transferrin in sufficient amounts to support their growth in low-iron medium. Surprisingly, similar rates of iron uptake in low-iron medium (0.033 and 0.032 nmol Fe/min and 10(6) cells) were found for LIT cells HeLa and HID cells K562. Furthermore, the intracellular iron level (4.64 nmol/10(6) cells) of HeLa cells grown in low-iron medium was much higher than iron levels (0.15 or 0.20 nmol/10(6) cells) of HeLa or K562 cells grown in transferrin medium. We demonstrated that the activity (ratio activated/total) of the iron regulatory protein (IRP) in HID cells Jiyoye and K562 increased more than twofold (from 0.32 to 0.79 and from 0.47 to 1.12, respectively) within 48 h after their transfer into low-iron medium. In the case of LIT cells HeLa and THP-1, IRP activity stayed at similar or slightly decreased levels (0.86-0.73 and 0.58-0.55, respectively). Addition of iron chelator deferoxamine (50 microM, i.e., about half-maximal growth-inhibitory dose) resulted in significantly increased activity of IRP also in HeLa and THP-1 cells. We hypothesize that the relatively higher bioavailability of nontransferrin iron in LIT cells, over that in HID cells, determines the differing responses observed under low-iron conditions.
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Affiliation(s)
- J Kovár
- Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, Prague, Czech Republic
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Abstract
The beta-chemokines monocyte chemotactic protein 1 (MCP-1), macrophage inflammatory protein 1 alpha (MIP-1alpha), MIP-1beta and regulated on activation, normal T cells, expressed and secreted (RANTES) induced the in vitro migration of the monocytic cell line MonoMac-6. MCP-1 exhibits the most potent chemotactic effect on this cell line while MIP-1alpha, RANTES and to a lesser extent MIP-1beta were more moderate inducers of cell migration. MonoMac-6 migration in response to chemokines was shown to be a chemotactic and not a chemokinetic response, which was inhibited by pertussis and cholera toxins suggesting a role for G proteins in chemokine receptor-mediated signalling in these cells; chemotaxis of MonoMac-6 cells in response to MCP-1 was abrogated by the addition of anti-MCP-1 antibody. The response of MonoMac-6 cells to the alpha-chemokines IL-8, IP-10, growth-related peptide (Gro) alpha and MIP-2beta was substantially weaker than to the beta-chemokines. MCP-1 caused an alteration in cellular morphology by increasing ruffling at the cell membrane and the number of cells exhibiting extended pseudopodia. The chemotactic response of MonoMac-6 cells to beta-chemokines was compared with less well-differentiated myelomonocytic cell lines. THP-1 showed a similar, but weaker response to the beta-chemokines while both HL60 and U937 failed to respond to any member of this subfamily when tested under the same conditions. These results suggest that the differentiation status of cells of monocytic lineage may affect their response to beta-chemokines.
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Affiliation(s)
- A K Cross
- Institute for Cancer Studies, University of Sheffield Medical School, UK
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Billings D, Hodson-Carlton K, Kirkpatrick J, Aaltonen P, Dillard N, Richardson V, Siktberg L, Vinten S. Computerized NCLEX-RN preparation programs. A comparative review. Comput Nurs 1996; 14:272-86. [PMID: 8870346] [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: 02/02/2023]
Abstract
Nursing faculty and students, as well as schools of nursing, are concerned about maintaining or improving pass rates on the National Council Licensure Examination for Registered Nurses (NCLEX-RN). This article offers a comparative review of eight computerized NCLEX-RN preparation programs: Compass RN; Health Education Systems, Inc. (HESI) Assess Test; NLN-CAT-RN Pharmacology Test; Meds, incorporated Comprehensive Q & A; Mosby's NCLEX Review; Medi-Sim Computer-Assisted Preparation for NCLEX-RN; Preparing for NCLEX-RN CAT; and NLN-CAT Practice RN. Criteria for evaluating these programs include program design features, types of questions and feedback, performance reports, screen design, ease of use, technical support and documentation, warranty and upgrade policy, and price. Issues associated with using NCLEX-RN preparation programs also are discussed.
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Affiliation(s)
- D Billings
- Indiana University School of Nursing, Indianapolis 46202-5107, USA.
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Juliá M, Kilty KM, Richardson V. Social worker preparedness for retirement: gender and ethnic considerations. Soc Work 1995; 40:610-620. [PMID: 7676278] [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: 05/21/2023]
Abstract
A systematic, comprehensive analysis of preretirement attitudes and planning among social workers is clearly needed. This article describes research to examine the extent to which social workers adequately prepare for retirement. The analysis established controls for gender and ethnicity, specifically for African American, Puerto Rican, and white social workers, because earlier research indicates that these variables significantly affect how much and how well professionals prepare for retirement. Based on the findings, recommendations and a call for action are provided that will help social workers prepare better before they retire and struggle less during retirement. The need for social workers to conceptualize retirement as a process that has several stages is stressed.
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Affiliation(s)
- M Juliá
- College of Social Work, Ohio State University, Columbus 43210, USA
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Affiliation(s)
- V Richardson
- Postgraduate and Research Department, Issstecali Hospital, University of Baja California, Tijuana, Mexico
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Knight D, Howie R, Doran J, Barrie D, Bourchier D, Richardson V, Darlow B, Broadbent R. Vitamin K administration in the newborn: statement by Fetus and Newborn Committee of Paediatric Society of New Zealand. N Z Med J 1992; 105:362. [PMID: 1436834] [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: 12/27/2022]
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Abstract
A 790 g infant developed cardiac tamponade 17 h after starting parenteral nutrition through a fine silastic catheter, the tip of which was accidentally positioned against the wall of the right atrium. Cold light examination suggested the diagnosis and pericardial aspiration of clear fluid with a high glucose content restored the circulation.
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Affiliation(s)
- G Aiken
- Neonatal Unit, Wellington Hospital, New Zealand
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Abstract
Although more women are initiating breast-feeding, few continue for more than 1-3 months into the postpartum period. The current report studied the relationship of attitudes, social support, experimental and demographic variables, and knowledge to length of breast-feeding. A totaL of 102 women were included in the study and were followed for 1 year. Perceived attitudes toward breast-feeding, selected demographic variables, and past experiences were related to length of breast-feeding.
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Abstract
This study examined the preretirement intentions of black professionals. The sample consisted of 234 blacks and was stratified by gender, age, and professional status. Based on a model developed for predicting the retirement intentions and attitudes of a sample of white professionals, six categories of independent variables (sociocultural, work history, alienation, leisure and social activities, financial planning, and plans for retirement life) were included in the analysis. Professionals who were highly committed to their work, had few financial investments, and socialized primarily with co-workers tended to avoid planning for retirement. These results have important implications for practitioners concerned with more effectively meeting the preretirement and retirement needs of older black adults.
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Affiliation(s)
- V Richardson
- College of Social Work, Ohio State University, Columbus 43210
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Abstract
This research examines gender differences in adjustment to retirement during the first year of retirement. It identifies differences in patterns of adjustment and differences in the discriminating variables that predict these patterns. The study was longitudinal in design and included a pretest interview of 250 people at the time of retirement, a posttest interview of 242 retirees six months after retirement, and a one-year follow-up of 222 completed by mail. A significant main effect for time was found for all three adjustment variables, with well-being declining at the six-month interval. A discriminant analysis of three types of adjustment groups revealed that responses to retirement varies depending on several factors. The findings suggest the need for a dynamic view of continuity theory.
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Affiliation(s)
- V Richardson
- College of Social Work, Ohio State University, Columbus 43210-1162
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LaMothe J, Billings DM, Belcher A, Cobb K, Nice A, Richardson V. Reliability and validity of the productivity environmental preference survey (PEPS). Nurse Educ 1991; 16:30-5. [PMID: 1866094 DOI: 10.1097/00006223-199107000-00013] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
This study was conducted to establish the reliability and validity of the Dunn, Dunn, and Price Productivity Environmental Preferences Survey (PEPS) with baccalaureate nursing students and to identify differences between subpopulations (age, class level, sex, type of student (RN versus generic] and students at risk. The findings have implications for nurse educators who choose teaching-learning experiences for a diverse student population.
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Kemeny DM, Price JF, Richardson V, Richards D, Lessof MH. The IgE and IgG subclass antibody response to foods in babies during the first year of life and their relationship to feeding regimen and the development of food allergy. J Allergy Clin Immunol 1991; 87:920-9. [PMID: 2026845 DOI: 10.1016/0091-6749(91)90413-i] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.0] [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: 12/29/2022]
Abstract
This follow-up study of 191 babies investigated the development of food allergy in an unselected population and its relationship to total and antigen-specific IgE and IgG subclass levels. Sensitization to egg, as indicated by a positive skin test or RAST, was found in 5% of 1-year-old babies, but none of the babies in this series fulfilled the clinical criteria for immediate-type milk allergy. For both bovine casein (CAS) and egg albumin, the IgG response was largely restricted to IgG1 in contrast to the predominant IgG4 response to these antigens that is found in adults. The level of IgG4, but not IgG1, antibody to CAS and ovalbumin (OV) was lower in some of the babies compared with that of their mothers (N = 166; p less than 0.05, Student's paired t test). However, there was no difference in the total serum IgG subclass levels between mothers and babies. These results demonstrate that, in the population of babies studied, (1) type I hypersensitivity to egg occurred in 5% of 1-year-old babies, (2) the predominant IgG subclass of antibodies to CAS and OV in babies is IgG1, and (3) in the 22% of babies, there was substantially (greater than 1000-fold) less IgG4 antibody to CAS and OV than in their mothers, suggesting specific exclusion of some IgG4 antibodies.
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Affiliation(s)
- D M Kemeny
- Department of Allergy and Allied Respiratory Disorders, United Medical School, Guy's Hospital, London, England
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Abstract
Tuberculosis continues to be a major health care problem in the world, especially among children. In the United States, health care providers rely heavily on routine skin testing to identify cases of tuberculosis. Pediatric nurse practitioners have the opportunity to recognize high-risk children, teach preventive health practices to patients and families, and thus to decrease morbidity from the disease. This article presents an overview of the incidence of the disease, as well as the causes, pathophysiology, epidemiology, diagnosis and management of tuberculosis.
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Reed C, Kirkup B, Richardson V. Contracts at Numberside. Health Serv J 1990; 100:514-5. [PMID: 10106518] [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: 02/11/2023]
Affiliation(s)
- C Reed
- Northern Regional Health Authority
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Abstract
The extent and patterns of financial planning among 234 black professionals was compared with those of white professionals. The data revealed similar expectations of continued income, supplementing finances by working in another occupation, pension income, and dependency on spouses for income. Although they invested less in stocks and bonds and bank certificates, income and age were the most significant predictors of financial planning.
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Richardson V. Pediatric management problems (lead poisoning). Pediatr Nurs 1985; 11:221-2. [PMID: 3846881] [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: 01/07/2023]
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Abstract
The relationships between chronological age, year of measurement, cohort membership, education, and perception of horizontal peerships versus vertical different status associations are explored through a sample of 1,428 respondents randomly selected from two larger representative national samples of American men and women utilized in a 1957 study and in a replication of that study in 1976. Data are based upon a thematic apperception procedure in which stories projected by respondents are coded for perceptions of peerships and of status differences. Significant age changes in interpersonal preference are observed for both sexes; there is no evidence of cohort changes or interactive effects with year. Contributions are made to research involving adult peer relations as well as to theories concerned with role discontinuity and ego changes in adulthood.
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Amico JA, Richardson V, Alpert B, Klein I. Clinical and chemical assessment of thyroid function during therapy with amiodarone. Arch Intern Med 1984; 144:487-490. [PMID: 6703817] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Clinical and chemical variables of thyroid function were studied in 26 patients with symptomatic ventricular tachyarrhythmias before and during long-term oral treatment with amiodarone. The mean (+/-SEM) pretreatment thyroxine (T4) level in the 26 patients was 7.32 +/- 0.33 micrograms/dL, and increased notably to 10.15 +/- 0.47 micrograms/dL by 30 to 120 days after treatment. The free thyroxine index (FT4I) was also notably elevated. Clinical hyperthyroidism or goiter did not develop, but clinical hypothyroidism occurred in four patients during and in one patient after discontinuation of amiodarone treatment. Notable titers of antithyroid antibodies were found in the serum of two of the five and a family history of thyroid disease was present in three of the five hypothyroid patients. An elevation of both the T4 level and the FT4I above the normal range is an expected finding in patients receiving amiodarone and does not by itself indicate hyperthyroidism. Patients with positive antithyroid antibodies or a family history of thyroid disease prior to treatment with amiodarone may be at an increased risk of hypothyroidism developing when treated with this drug.
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