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Blanco CF, Quik JTK, Hof M, Fuortes A, Behrens P, Cucurachi S, Peijnenburg WJGM, Dimroth F, Vijver MG. A prospective ecological risk assessment of high-efficiency III-V/silicon tandem solar cells. Environ Sci Process Impacts 2024; 26:540-554. [PMID: 38299676 PMCID: PMC10951974 DOI: 10.1039/d3em00492a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2023] [Accepted: 01/11/2024] [Indexed: 02/02/2024]
Abstract
III-V/Silicon tandem solar cells offer one of the most promising avenues for high-efficiency, high-stability photovoltaics. However, a key concern is the potential environmental release of group III-V elements, especially arsenic. To inform long-term policies on the energy transition and energy security, we develop and implement a framework that fully integrates future PV demand scenarios with dynamic stock, emission, and fate models in a probabilistic ecological risk assessment. We examine three geographical scales: local (including a floating utility-scale PV and waste treatment), regional (city-wide), and continental (Europe). Our probabilistic assessment considers a wide range of possible values for over one hundred uncertain technical, environmental, and regulatory parameters. We find that III-V/silicon PV integration in energy grids at all scales presents low-to-negligible risks to soil and freshwater organisms. Risks are further abated if recycling of III-V materials is considered at the panels' end-of-life.
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Affiliation(s)
- C F Blanco
- Institute of Environmental Sciences (CML), Leiden University. Box 9518, 2300 RA Leiden, The Netherlands.
| | - J T K Quik
- National Institute of Public Health and the Environment (RIVM), P.O. Box 1, 3720 BA Bilthoven, The Netherlands
| | - M Hof
- National Institute of Public Health and the Environment (RIVM), P.O. Box 1, 3720 BA Bilthoven, The Netherlands
| | - A Fuortes
- National Institute of Public Health and the Environment (RIVM), P.O. Box 1, 3720 BA Bilthoven, The Netherlands
| | - P Behrens
- Institute of Environmental Sciences (CML), Leiden University. Box 9518, 2300 RA Leiden, The Netherlands.
| | - S Cucurachi
- Institute of Environmental Sciences (CML), Leiden University. Box 9518, 2300 RA Leiden, The Netherlands.
| | - W J G M Peijnenburg
- Institute of Environmental Sciences (CML), Leiden University. Box 9518, 2300 RA Leiden, The Netherlands.
- National Institute of Public Health and the Environment (RIVM), P.O. Box 1, 3720 BA Bilthoven, The Netherlands
| | - F Dimroth
- Fraunhofer Institute for Solar Energy Systems, Heidenhofstr. 2, 79110 Freiburg, Germany
| | - M G Vijver
- Institute of Environmental Sciences (CML), Leiden University. Box 9518, 2300 RA Leiden, The Netherlands.
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Kloosterman FR, Zwagemaker AF, Bagot CN, Beckers EAM, Castaman G, Cnossen MH, Collins PW, Hay C, Hof M, Laros-van Gorkom B, Leebeek FWG, Male C, Meijer K, Pabinger I, Shapiro S, Coppens M, Fijnvandraat K, Gouw, SC. The bleeding phenotype in people with nonsevere hemophilia. Blood Adv 2022; 6:4256-4265. [PMID: 35533261 PMCID: PMC9327532 DOI: 10.1182/bloodadvances.2022007620] [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] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2022] [Accepted: 04/28/2022] [Indexed: 11/20/2022] Open
Abstract
Detailed information on the onset, frequency, and severity of bleeding in nonsevere hemophilia is limited. We aimed to assess the bleeding phenotype of persons with nonsevere hemophilia and to analyze the association between baseline factor VIII/IX (FVIII/IX) levels and the joint bleeding rate. In the DYNAMO (Dynamic Interplay Between Bleeding Phenotype and Baseline Factor Level in Moderate and Mild Hemophilia A and B) study, an international multicenter cohort, we included males with nonsevere hemophilia (FVIII/IX, 0.02-0.35 IU/mL) aged 12 to 55 years. Information on age at first treated (joint) bleed, annual bleeding rates (ABRs), and annual joint bleeding rates (AJBRs) was collected from the medical files. The association between baseline FVIII/IX levels and the joint bleeding rate was assessed by using a frailty model for recurrent events. In total, 304 persons (70 with moderate hemophilia and 234 with mild hemophilia) were included. The median age was 38 years (interquartile range [IQR], 25-49 years), and the median baseline FVIII/IX level was 0.12 IU/mL (IQR, 0.05-0.21 IU/mL). In total, 245 (81%) persons had experienced at least 1 bleed, and 156 (51%) had experienced at least 1 joint bleed. The median age at first bleed and first joint bleed was 8 and 10 years, respectively. The median ABR and AJBR was 0.2 (IQR, 0.1-0.5) and 0.0 (IQR, 0.0-0.2). From baseline FVIII/IX levels 0.02 to 0.05 IU/mL to >0.25 IU/mL, the median ABR decreased from 0.6 (IQR, 0.2-1.4) to 0.1 (IQR, 0.0-0.2) and the AJBR from 0.2 (IQR, 0.0-0.4) to 0.0 (IQR, 0.0-0.0). Baseline FVIII/IX was inversely associated with the joint bleeding rate (P < .001). Low bleeding rates were observed in persons with nonsevere hemophilia. However, one-half of all adolescents and adults had experienced a joint bleed.
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Affiliation(s)
- Fabienne R. Kloosterman
- Emma Children’s Hospital, Pediatric Hematology, Amsterdam UMC, University of Amsterdam, Meibergdreef 9, Amsterdam, The Netherlands
| | - Anne-Fleur Zwagemaker
- Emma Children’s Hospital, Pediatric Hematology, Amsterdam UMC, University of Amsterdam, Meibergdreef 9, Amsterdam, The Netherlands
| | - Catherine N. Bagot
- Department of Haematology, Glasgow Royal Infirmary, Glasgow, United Kingdom
| | - Erik A. M. Beckers
- Division of Hematology, Department of Internal Medicine, CARIM School for Cardiovascular Diseases, Maastricht University Medical Center, Maastricht, The Netherlands
| | - Giancarlo Castaman
- Department of Oncology, Center for Bleeding Disorders, Careggi University Hospital, Florence, Italy
| | - Marjon H. Cnossen
- Department of Pediatric Hematology, Erasmus University Medical Center–Sophia Children’s Hospital, Rotterdam, The Netherlands
| | - Peter W. Collins
- Cardiff Haemophilia Centre, School of Medicine, Cardiff University, Cardiff, United Kingdom
| | - Charles Hay
- University Department of Haematology, The University of Manchester, Manchester Royal Infirmary, Manchester, United Kingdom
| | - Michel Hof
- Department of Epidemiology and Data Science, Amsterdam UMC, University of Amsterdam, Meibergdreef 9, Amsterdam, The Netherlands
| | | | - Frank W. G. Leebeek
- Department of Hematology, Erasmus University Medical Center, Erasmus MC, Rotterdam, The Netherlands
| | - Christoph Male
- Department of Pediatrics, Medical University of Vienna, Vienna, Austria
| | - Karina Meijer
- Department of Hematology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Ingrid Pabinger
- Clinical Division of Hematology and Hemostaseology, Medical University of Vienna, Vienna, Austria
| | - Susan Shapiro
- Department of Haematology, Oxford University Hospitals NHS Foundation, Oxford NIHR Biomedical Research Centre, Oxford, United Kingdom
- Radcliffe Department of Medicine, Oxford University, Oxford, United Kingdom
| | - Michiel Coppens
- Department of Vascular Medicine, Amsterdam UMC, University of Amsterdam, Meibergdreef 9, Amsterdam, The Netherlands; and
| | - Karin Fijnvandraat
- Emma Children’s Hospital, Pediatric Hematology, Amsterdam UMC, University of Amsterdam, Meibergdreef 9, Amsterdam, The Netherlands
- Department of Molecular Cellular Hemostasis, Sanquin Research and Landsteiner Laboratory, Amsterdam, The Netherlands
| | - Samantha C. Gouw,
- Emma Children’s Hospital, Pediatric Hematology, Amsterdam UMC, University of Amsterdam, Meibergdreef 9, Amsterdam, The Netherlands
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Rettenbacher E, Zaal J, Heijboer H, van der Plas EM, Hof M, Biemond BJ, Fijnvandraat K. Mortality and Causes of Death From Sickle Cell Disease in The Netherlands, 1985-2017. J Pediatr Hematol Oncol 2021; 43:258-265. [PMID: 34001787 DOI: 10.1097/mph.0000000000002193] [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] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Accepted: 03/26/2021] [Indexed: 11/26/2022]
Abstract
In the Netherlands, between 1985 and 2007 secular changes in the health care of patients with sickle cell disease (SCD) have taken place, such as penicillin prophylaxis, vaccination programs and stroke prevention. We investigated the number and causes of death in a cohort of 298 SCD patients, established in 2007, before introduction of neonatal screening, to determine preventable deaths. All patients were diagnosed with SCD before the age of 18 (median age at diagnosis 5.1 y). Their vital status was determined up to January 2017. After a total follow-up period of 4565 patient years and a median time of follow-up of 15 years for all patients, 230 patients (77%) were still alive, 45 patients (15%) were lost to follow-up and a total of 23 patients (8%) had died. Estimated survival to 18 years was 92% with a global mortality rate of 0.48 deaths/100 patient years. Leading causes of death were infection (35%) followed by neurologic complications (22%) and death in the course of a painful episode (13%). Nine of the 20 known causes of death were preventable. These results strongly suggest the benefit of comprehensive care measures for patients with SCD in the Netherlands to further prevent morbidity and mortality.
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Affiliation(s)
- Eva Rettenbacher
- Department of Pediatric Hematology, Amalia Children's Hospital, Radboudumc, University Medical Center, Nijmegen
| | | | | | | | - Michel Hof
- Departments of Clinical Epidemiology, Biostatistics and Bioinformatics
| | - Bart J Biemond
- Hematology, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
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Deppe AC, Kolibay F, Burst V, Simon S, Rothschild M, Kochanek M, Annecke T, Adler C, Dusse F, Hof M, Langebartels G, Reimers S, Muckel S, Roth B, Wolff J, Onur OA. [Prioritization of intensive medical treatment places - Concept proposal]. Chirurg 2021; 92:822-829. [PMID: 33404665 PMCID: PMC7786159 DOI: 10.1007/s00104-020-01334-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/05/2020] [Indexed: 11/16/2022]
Abstract
In the situation of a shortage of ventilation beds, ethically justifiable, transparent and comprehensible decisions must be made. This concept proposes that all patients are first intubated depending on necessity and then assessed by a triage team afterwards. In this situation newly admitted COVID patients compete with newly admitted Non-COVID patients as well as patients already treated in intensive care units for a ventilator. The combination of short-term and long-term prognoses should enable the interprofessional triage team to make comprehensible decisions. The aim of the prioritization concept is to save as many human lives as possible and to relieve the treatment team of the difficult decision on prioritization.
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Affiliation(s)
- A C Deppe
- Herzchirurgische Intensivstation, Klinik und Poliklinik für Herzchirurgie, herzchirurgische Intensivmedizin und Thoraxchirurgie, Universität zu Köln, Medizinische Fakultät und Uniklinik, Köln, Deutschland.
| | - F Kolibay
- Katastrophenschutzbeauftragter, Stabsabteilung Klinikangelegenheiten und Krisenmanagement des Ärztlichen Direktors, Universität zu Köln, Medizinische Fakultät und Uniklinik, Köln, Deutschland
| | - V Burst
- Zentrale Notaufnahme, Klinik II für Innere Medizin: Nephrologie, Rheumatologie, Diabetologie und Allgemeine Innere Medizin, Universität zu Köln, Medizinische Fakultät und Uniklinik, Köln, Deutschland
| | - S Simon
- Zentrum für Palliativmedizin, Universität zu Köln, Medizinische Fakultät und Uniklinik, Köln, Deutschland
| | - M Rothschild
- Institut für Rechtmedizin, Universität zu Köln, Medizinische Fakultät und Uniklinik, Köln, Deutschland
| | - M Kochanek
- Internistische Intensivstation, Klinik I für Innere Medizin: Hämatologie und Onkologie, Universität zu Köln, Medizinische Fakultät und Uniklinik, Köln, Deutschland
| | - T Annecke
- Anästhesiologische Intensivstation, Klinik für Anästhesiologie und operative Intensivmedizin, Universität zu Köln, Medizinische Fakultät und Klinikum der Universität zu Witten/Herdecke, Kliniken Köln, Köln, Deutschland
| | - C Adler
- Kardiologische Intensivstation, Klinik III für Innere Medizin: Allgemeine und interventionelle Kardiologie, Elektrophysiologie, Angiologie, Pneumologie und internistische Intensivmedizin, Universität zu Köln, Medizinische Fakultät und Uniklinik, Köln, Deutschland
| | - F Dusse
- Anästhesiologische Intensivstation, Klinik für Anästhesiologie und operative Intensivmedizin, Universität zu Köln, Medizinische Fakultät und Klinikum der Universität zu Witten/Herdecke, Kliniken Köln, Köln, Deutschland
| | - M Hof
- Neurochirurgische Intensivstation, Klinik und Poliklinik für allgemeine Neurochirurgie, Universität zu Köln, Medizinische Fakultät und Uniklinik, Köln, Deutschland
| | - G Langebartels
- Ärztlicher Koordinator Intensivmedizin, Stabsabteilung Klinikangelegenheiten und Krisenmanagement des Ärztlichen Direktors, Universität zu Köln, Medizinische Fakultät und Uniklinik, Köln, Deutschland
| | - S Reimers
- Pflegedienstleitung Intensivpflege, Universität zu Köln, Medizinische Fakultät und Uniklinik, Köln, Deutschland
| | - S Muckel
- Juristische Fakultät, Öffentliches Recht und Religionsrecht, Institute für Religionsrecht, Universität zu Köln, Köln, Deutschland
| | - B Roth
- Klinik und Poliklinik für Kinder- und Jugendmedizin, Universität zu Köln, Medizinische Fakultät und Uniklinik, Köln, Deutschland
| | - J Wolff
- Katholische Seelsorge, Universität zu Köln, Medizinische Fakultät und Uniklinik, Köln, Deutschland
| | - O A Onur
- Neurologische Intensivstation, Klinik und Poliklinik für Neurologie, Universität zu Köln, Medizinische Fakultät und Uniklinik, Köln, Deutschland
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De Boer L, Hutten B, Wiegman A, Kastelein J, Hof M. Lipoprotein(A) Levels Over Time: A Long-Term Follow-Up Study Of A Large Cohort Of Children. Atherosclerosis 2019. [DOI: 10.1016/j.atherosclerosis.2019.06.168] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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6
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Vogl F, Humpolícková J, Amaro M, Koller D, Köfeler H, Zenzmaier E, Hof M, Hermetter A. Role of protein kinase C δ in apoptotic signaling of oxidized phospholipids in RAW 264.7 macrophages. Biochim Biophys Acta Mol Cell Biol Lipids 2016; 1861:320-30. [DOI: 10.1016/j.bbalip.2015.12.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2015] [Revised: 11/26/2015] [Accepted: 12/17/2015] [Indexed: 10/22/2022]
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Kamphuis EI, Koullali B, Hof M, de Groot CJM, Kazemier BM, Robertson S, Mol BWJ, Ravelli AC. Fetal Gender of the First Born and the Recurrent Risk of Spontaneous Preterm Birth. Am J Perinatol 2015; 32:1305-10. [PMID: 26352684 DOI: 10.1055/s-0035-1563716] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
OBJECTIVE To study, in women with a spontaneous preterm birth (sPTB) in the first pregnancy, the effect of fetal sex in that first pregnancy on the recurrent sPTB risk. STUDY DESIGN A nationwide retrospective cohort study (data from National Perinatal Registry) on all women with two sequential singleton pregnancies (1999-2009) with the first delivery ending in sPTB <37 weeks. We used logistic regression analysis to study the association between fetal gender in the first pregnancy and the risk of recurrent sPTB. We repeated the analysis for sPTB < 32 weeks. RESULTS The overall incidence of sPTB <37 weeks in the first pregnancy was 4.5% (15,351/343,853). Among those 15,351 women, the risk of recurrent sPTB <37 weeks was increased when the first fetus was female compared when that fetus was male (15.8 vs. 15.2%; adjusted odds ratio [aOR] 1.2; 95% confidence interval [CI] 1.05-1.3). A similar effect was seen for sPTB <32weeks (8.2 vs. 5.9%; aOR 4.5; 95% CI 1.5-13). CONCLUSION Women who suffer sPTB of a female fetus have an increased risk of recurrent sPTB compared with women who suffer sPTB of a male fetus. This information provides proof for the hypothesis that sPTB is due to an independent maternal and fetal factor.
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Affiliation(s)
- Esmé I Kamphuis
- Center for Reproductive Medicine, Department of Obstetrics and Gynaecology, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands
| | - Bouchra Koullali
- Center for Reproductive Medicine, Department of Obstetrics and Gynaecology, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands
| | - Michel Hof
- Department of Clinical Epidemiology, Bioinformatics, and Biostatistics, Academic Medical Centre, Amsterdam, The Netherlands
| | - Christianne J M de Groot
- Department of Obstetrics and Gynecology, VU University Medical Centre, Amsterdam, The Netherlands
| | - Brenda M Kazemier
- Center for Reproductive Medicine, Department of Obstetrics and Gynaecology, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands
| | - Sarah Robertson
- The Robinson Research Institute
- School of Paediatrics and Reproductive Health, University of Adelaide, South Australia, Australia
| | - Ben W J Mol
- The Robinson Research Institute
- School of Paediatrics and Reproductive Health, University of Adelaide, South Australia, Australia
| | - Anita C Ravelli
- Center for Reproductive Medicine, Department of Obstetrics and Gynaecology, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands
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Koullali B, Kamphuis E, de Groot C, Pajkrt E, Hof M, Robertson S, Mol BW, Ravelli A. 16: Can variation of the interval between the first and second pregnancy be used as a therapeutic strategy to reduce recurrent spontaneous preterm birth? Am J Obstet Gynecol 2015. [DOI: 10.1016/j.ajog.2014.10.062] [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: 11/12/2022]
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9
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Kamphuis E, Koullali B, Hof M, de Groot C, Kazemier B, Mol BW, Ravelli A. 797: Fetal gender of the first born and the recurrent risk of spontaneous preterm birth. Am J Obstet Gynecol 2015. [DOI: 10.1016/j.ajog.2014.10.1003] [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: 10/24/2022]
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10
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Besseling J, Kindt I, Hof M, Kastelein JJ, Hutten BA, Hovingh GK. Severe heterozygous familial hypercholesterolemia and risk for cardiovascular disease: A study of a cohort of 14,000 mutation carriers. Atherosclerosis 2014; 233:219-23. [DOI: 10.1016/j.atherosclerosis.2013.12.020] [Citation(s) in RCA: 149] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/30/2013] [Revised: 12/11/2013] [Accepted: 12/11/2013] [Indexed: 11/30/2022]
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Kok N, Ruiter L, Hof M, Ravelli A, Mol BW, Pajkrt E, Kazemier B. Risk of maternal and neonatal complications in subsequent pregnancy after planned caesarean section in a first birth, compared with emergency caesarean section: a nationwide comparative cohort study. BJOG 2013; 121:216-23. [DOI: 10.1111/1471-0528.12483] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/07/2013] [Indexed: 11/27/2022]
Affiliation(s)
- N Kok
- Department of Obstetrics and Gynaecology; Academic Medical Centre; Amsterdam The Netherlands
| | - L Ruiter
- Department of Obstetrics and Gynaecology; Academic Medical Centre; Amsterdam The Netherlands
| | - M Hof
- Department of Clinical Epidemiology, Biostatistics and Bioinformatics; Academic Medical Centre; Amsterdam The Netherlands
| | - A Ravelli
- Department of Clinical Epidemiology, Biostatistics and Bioinformatics; Academic Medical Centre; Amsterdam The Netherlands
| | - BW Mol
- Department of Obstetrics and Gynaecology; Academic Medical Centre; Amsterdam The Netherlands
| | - E Pajkrt
- Department of Obstetrics and Gynaecology; Academic Medical Centre; Amsterdam The Netherlands
| | - B Kazemier
- Department of Obstetrics and Gynaecology; Academic Medical Centre; Amsterdam The Netherlands
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Hutterer R, Schneider FW, Pérez N, Ruf H, Hof M. Influence of lipid composition and membrane curvature on fluorescence and solvent relaxation kinetics in unilamellar vesicles. J Fluoresc 2013; 3:257-9. [PMID: 24234906 DOI: 10.1007/bf00865274] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/1993] [Indexed: 12/01/2022]
Abstract
Time-resolved fluorescence on unilamellar vesicles shows that increasing amounts of anionic, natural lipid lead to a larger increase in polarity close to the headgroups than in the hydrophobic core of the bilayer. The region close to the headgroups is less polar in vesicles containing phosphatic acid rather than phosphatidylserine. A greater membrane curvature increases the mobility of the hydrated headgroups.
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Affiliation(s)
- R Hutterer
- Institute of Physical Chemistry, University of Würzburg, Marcusstr. 9/11, D-97070, Würzburg, Germany
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13
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Jurkiewicz P, Cwiklik L, Jungwirth P, Hof M. Lipid hydration and mobility: An interplay between fluorescence solvent relaxation experiments and molecular dynamics simulations. Biochimie 2012; 94:26-32. [DOI: 10.1016/j.biochi.2011.06.027] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2011] [Accepted: 06/23/2011] [Indexed: 11/29/2022]
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Hof M, Pommer B, Strbac GD, Sütö D, Watzek G, Zechner W. Esthetic evaluation of single-tooth implants in the anterior maxilla following autologous bone augmentation. Clin Oral Implants Res 2011; 24 Suppl A100:88-93. [PMID: 22150807 DOI: 10.1111/j.1600-0501.2011.02381.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/20/2011] [Indexed: 12/22/2022]
Abstract
OBJECTIVES Autologous bone augmentation to rebuild compromised alveolar ridge contour prior to implant placement allows for favorable three-dimensional implant positioning to achieve optimum implant esthetics. The aim of the present study was to evaluate peri-implant soft tissue conditions around single-tooth implants following bone grafts in the esthetic zone of the maxilla. MATERIALS AND METHODS Sixty patients underwent autologous bone augmentation of deficient maxillary sites prior to placement of 85 implants in the esthetic zone. In case of multiple implants per patient, one implant was randomly selected. Objective evaluation of 60 single-tooth implants was performed using the Pink-Esthetic-Score (PES) and Papilla Index (PI) and supplemented by subjective patient evaluation, as well as clinical and radiologic examination. RESULTS Objective ratings of implant esthetics were satisfactory (median PES: 11, median PI: 2) and significantly correlated with high patient satisfaction (mean VAS score: 80%). Both esthetic indices demonstrated respectable levels of inter- as well as intra-observer agreement. Poor implant esthetics (low PES and PI ratings) were significantly associated with increased anatomic crown height, while no influence of horizontal implant-tooth distance could be found. CONCLUSIONS The present investigation indicates that favorable esthetic results may be achieved in the augmented anterior maxilla. However, bony reconstruction of compromised alveolar ridges does not guarantee optimum implant esthetics.
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Affiliation(s)
- M Hof
- Department of Oral Surgery, Bernhard Gottlieb School of Dentistry, Medical University of Vienna, Vienna, Austria
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Norris S, Humpolíčková J, Amler E, Huranová M, Buzgo M, Macháň R, Lukáš D, Hof M. Raster image correlation spectroscopy as a novel tool to study interactions of macromolecules with nanofiber scaffolds. Acta Biomater 2011; 7:4195-203. [PMID: 21801861 DOI: 10.1016/j.actbio.2011.07.012] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2011] [Revised: 06/28/2011] [Accepted: 07/07/2011] [Indexed: 11/27/2022]
Abstract
Dynamic processes such as diffusion and binding/unbinding of macromolecules (e.g. growth factors or nutrients) are crucial parameters for the design and application of effective artificial tissue materials. Here, dynamics of selected macromolecules were studied in two different composite tissue engineering scaffolds containing an electrospun nanofiber mesh (polycaprolactone or hydrophobically plasma modified polyvinylalcohol-chitosan) encapsulated in agarose hydrogels by a conventional approach fluorescence recovery after photobleaching (FRAP) and a novel technique, raster image correlation spectroscopy (RICS). The two approaches are compared, and it is shown that FRAP is unable to determine processes occurring at low molecular concentrations, especially accurately separating binding/unbinding from diffusion, and its results depend on the concentration of the studied molecules. RICS measures processes of single molecules and, because of its multiple adjustable timescales, can distinguish whether diffusion or binding controls molecular movement and separates fast diffusion from slow transient binding. In addition, RICS provides a robust read-out parameter quantifying binding affinity. Finally, the combination of FRAP and RICS helps to characterize diffusion and binding of macromolecules in tested artificial tissues better, and therefore predicts the behavior of biologically active molecules in these materials for medical applications.
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Pembouong G, Morellet N, Kral T, Hof M, Scherman D, Bureau MF, Mignet N. A comprehensive study in triblock copolymer membrane interaction. J Control Release 2011; 151:57-64. [DOI: 10.1016/j.jconrel.2011.01.007] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2010] [Revised: 12/24/2010] [Accepted: 01/09/2011] [Indexed: 11/17/2022]
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Brand K, Hof M, Schneider FW. Isotope Effect in the Time Resolved Fluorescence of Anthracene in Small Unilamellar Vesicles. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19910951138] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Sýkora J, Bourová L, Hof M, Svoboda P. The effect of detergents on trimeric G-protein activity in isolated plasma membranes from rat brain cortex: correlation with studies of DPH and Laurdan fluorescence. Biochim Biophys Acta 2008; 1788:324-32. [PMID: 19071083 DOI: 10.1016/j.bbamem.2008.11.008] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2008] [Revised: 11/11/2008] [Accepted: 11/11/2008] [Indexed: 10/21/2022]
Abstract
The effect of non-ionic detergents on baclofen (GABAB-R agonist)-stimulated G-protein activity was measured as a [(35)S]GTPgammaS binding assay in the plasma membranes (PM) isolated from the brain tissue. The effect was clearly biphasic--a decrease in the activity was followed by an activation maximum and finally, at high concentrations, drastic inhibition of the G-protein activity was noticed. Contrarily, specific radioligand binding to GABAB-receptor was inhibited in the whole range of detergent concentrations step by step, i.e. it was strictly monophasic. The magnitude of both detergent effects was decreased in the same order of potency: Brij58>Triton X-100>Digitonin. The identical order was found when comparing detergents ability to alter fluorescence anisotropy of the membrane probe 1,6-diphenyl-1,3,5-hexatriene (rDPH) incorporated into the hydrophobic PM interior. Decrease of rDPH, in the order of Brij58>Triton X-100>Digitonin, was reflected as decrease of the S-order parameter and rotation correlation time phi paralleled by an increase of diffusion wobbling constant Dw (analysis by time-resolved fluorescence according to "wobble-in-cone" model). The influence of the detergents on the membrane organization at the polar headgroup region was characterized by Laurdan generalized polarization (GP). As before, the effect of detergents on GP parameters proceeded in the order: Brij58>Triton X-100>Digitonin.
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Affiliation(s)
- J Sýkora
- J. Heyrovsky Institute of Physical Chemistry of the ASCR, v. v. i., Dolejskova 2155/3, 18223 Prague 8, Czech Republic
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Rieber K, Sýkora J, Olzyńska A, Jelinek R, Cevc G, Hof M. The use of solvent relaxation technique to investigate headgroup hydration and protein binding of simple and mixed phosphatidylcholine/surfactant bilayer membranes. Biochimica et Biophysica Acta (BBA) - Biomembranes 2007; 1768:1050-8. [PMID: 17300743 DOI: 10.1016/j.bbamem.2006.12.018] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2006] [Revised: 12/19/2006] [Accepted: 12/22/2006] [Indexed: 10/23/2022]
Abstract
The subject of this report was to investigate headgroup hydration and mobility of two types of mixed lipid vesicles, containing nonionic surfactants; straight chain Brij 98, and polysorbat Tween 80, with the same number of oxyethylene units as Brij, but attached via a sorbitan ring to oleic acid. We used the fluorescence solvent relaxation (SR) approach for the purpose and revealed differences between the two systems. Fluorescent solvent relaxation probes (Prodan, Laurdan, Patman) were found to be localized in mixed lipid vesicles similarly as in pure phospholipid bilayers. The SR parameters (i.e. dynamic Stokes shift, Deltanu, and the time course of the correlation function, C(t)) of such labels are in the same range in both kinds of systems. Each type of the tested surfactants has its own impact on water organization in the bilayer headgroup region probed by Patman. Brij 98 does not modify the solvation characteristics of the dye. In contrast, Tween 80 apparently dehydrates the headgroup and decreases its mobility. The SR data measured in lipid bilayers in presence of Interferon alfa-2b reveal that this protein, a candidate for non-invasive delivery, affects the bilayer in a different way than the peptide melittin. Interferon alfa-2b binds to mixed lipid bilayers peripherally, whereas melittin is deeply inserted into lipid membranes and affects their headgroup hydration and mobility measurably.
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Affiliation(s)
- K Rieber
- IDEA AG, Frankfurter Ring 193 a, 80807 Munich, Germany
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Olzyńska A, Zań A, Jurkiewicz P, Sýkora J, Gröbner G, Langner M, Hof M. Molecular interpretation of fluorescence solvent relaxation of Patman and 2H NMR experiments in phosphatidylcholine bilayers. Chem Phys Lipids 2007; 147:69-77. [PMID: 17467676 DOI: 10.1016/j.chemphyslip.2007.03.004] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [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: 12/05/2006] [Revised: 03/09/2007] [Accepted: 03/14/2007] [Indexed: 11/25/2022]
Abstract
The analysis of time-dependent fluorescence shifts of the bilayer probe 6-hexadecanoyl-2-(((2-(trimethylammonium)ethyl)methyl)amino)naphthalene chloride (Patman) offers valuable information on the hydration and dynamics of phospholipid headgroups. Quenching studies on vesicles composed of four phosphatidylcholines with different hydrocarbon chains (18:1c9/18:1c9, DOPC; 16:0/18:1c9, POPC; 18:1c9/16:0, OPPC; 18:1c6/18:1c6, PCDelta6) show that the chromophore of Patman is defined located at the level of the sn-1 ester-group in the phospholipid, which is invariant to the hydrocarbon chain. The so-called solvent relaxation (SR) approach as well as solid-state 2H NMR reveals that DOPC and PCDelta6 are more hydrated than POPC and OPPC. A strong dependence of SR kinetics on the position of double bond in the investigated fatty acid chains was observed. Apparently, the closer the double bond is located to the hydrated sn-1 ester-group, the more mobile this group becomes. This work demonstrates that the SR approach can report mobility changes within phospholipid bilayers with a remarkable molecular resolution.
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Affiliation(s)
- A Olzyńska
- Academy of Sciences of the Czech Republic, J. Heyrovský Institute of Physical Chemistry, v.v.i., Dolejskova 3, CZ-18223 Prague 8, Czech Republic
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Affiliation(s)
- J Hohlbein
- Max Planck Institute of Microstructure Physics, Weinberg 2, 06120 Halle, Germany
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Hutterer R, Hof M. Probing Ethanol-Induced Phospholipid Phase Transitions by the Polarity Sensitive Fluorescence Probes Prodan and Patman. ACTA ACUST UNITED AC 2002. [DOI: 10.1524/zpch.2002.216.3.333] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
The emission behaviour of the two polarity sensitive probes Prodan and Patman in phospholipid vesicles was studied as a function of the concentration of ethanol. Comparing the spectral shifts in both the symmetric lipid 1,2-dipalmitoyl-sn-glycero-3-phosphatidylcholine (DPPC) showing a phase transition from a normal to a fully interdigitated gel phase and the strongly asymmetric lipid 1-stearoyl-2-lauroyl-sn-glycero-3-phosphatidylcholine (C(18):C(12)-PC) favouring a mixed interdigitated gel phase we show that the huge red shifts of Prodan in presence of higher ethanol concentrations cannot be easily attributed to a specific lipid phase transition. Rather, probe relocation and a pronounced increase in solvent relaxation (SR) as monitored by time-resolved emission spectra (TRES) in presence of ethanol contribute to the large shifts observable in both lipid systems in case of Prodan. While Patman exhibits a red shift caused by increased SR due to the ethanol induced formation of a fully interdigitated phase in DPPC, hardly any shift occurs in C(18):C(12)-PC, which is supposed not to undergo an ethanol-induced phase transition.
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Abstract
The aim of this study was to investigate the effects of genetic, sex, and early environmental factors on the voluntary alcohol intake in Wistar rats. Genetic correlates were examined by comparing animals pharmacogenetically selected for high susceptibility to apomorphine (APO-SUS) with animals selected for low susceptibility (APO-UNSUS). Early environmental factors were investigated through postnatal manipulations (cross-fostering in APO-SUS and maternal deprivation in APO-UNSUS). Voluntary alcohol intake was measured using a two-bottle, free-choice protocol, in which animals could choose either water or an ascending series of alcohol concentrations every second day. Genetic correlates were only observed in male rats, with APO-UNSUS animals consuming more alcohol than APO-SUS animals. No effect of the early postnatal manipulations was detected: neither cross-fostering nor maternal deprivation influenced the voluntary alcohol intake. As for the influence of gender on ethanol self-administration, APO-SUS females consume more alcohol than APO-SUS males, while no sex differences were observed in APO-UNSUS animals.
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Affiliation(s)
- F Sluyter
- Department of Biological Psychology, Vrije Universiteit, Vander Boechorststraa 1, 1081 BT Amsterdam, Netherlands.
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Hogg S, Hof M, Würbel H, Steimer T, de Ruiter A, Koolhaas J, Sluyter F. Behavioral profiles of genetically selected aggressive and nonaggressive male wild house mice in two anxiety tests. Behav Genet 2000; 30:439-46. [PMID: 11523703 DOI: 10.1023/a:1010246717180] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Artificially selected aggressive (SAL) and non-aggressive (LAL) male house mice were tested in a hexagonal tunnel maze and light-dark preference (LD) box to determine if the bidirectional selection for aggressive behavior leads to a coselection for different levels of trait anxiety. The tunnel maze consists of an open, brightly lit central arena surrounded by a complex system of interconnecting tunnels. As in the LD box, animals which spend less time and are less active in the brightly illuminated section of the maze are considered to have higher anxiety levels. In the tunnel maze, the LAL mice showed more exploration and spent more time in the central arena than the SAL animals, but only during the final 2 min of the 6-min test. This reduced preference for the central arena was not due to general inactivity or a failure of the SAL to find the central arena and indicates a higher level of state anxiety in the aggressive animals. In contrast, no "anxiety-like" differences were found in the LD box, either for the percentage of time spent in the light compartment or for the number of crossings. SAL males actually showed higher levels of moving and rearing, and lower levels of freezing, than did LAL males.
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Affiliation(s)
- S Hogg
- Department of Psychopharmacology Depression, Copenhagen-Valby, Denmark.
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Abstract
Time-resolved fluorescence of the single tryptophan residue Trp41 in fragment 1-86 of factor X (FX F1-86) is studied using a time-correlated single photon counting technique with synchrotron radiation as the excitation source. Calcium ions are believed to induce a conformational change in the N-termini of the activated factor X and other vitamin K dependent proteins, which is accompanied by a decrease in fluorescence intensity. The titration with calcium yields a sigmoidal fluorescence titration curve with a transition midpoint concentration of 0.44 mM. The wavelength-dependent tryptophan fluorescence decays of the apo-FX F1-86 (in the absence of calcium) and Ca-FX F1-86 are characterized by conventional multiexponential analysis and fluorescence lifetime distribution analysis. In the absence of calcium there are three significant classes of fluorescence lifetimes (ns) that are nearly wavelength independent: 0.55 +/- 0.08 (component A), 2.6 +/- 0.1 (component B), and 5.3 +/- 0.3 (component C). However, their preexponential amplitudes vary with wavelength. The decay associated emission spectra of the individual components show that components B and C contribute over 85% to the total fluorescence for all examined wavelengths. However, in the presence of calcium, the analysis of the time-resolved fluorescence data of Ca-FX F1-86 yields four wavelength-independent lifetimes (ns) of 0.30 +/- 0.09 (component D), 0.65 +/- 0.10 (component A), 2.7 +/- 0.2 (component B), and 5.4 +/- 0.3 (component C). Calcium addition to the apo-FX F1-86 leads to a decrease in the fluorescence intensities of components B and C while their decay times remain unaffected. In Ca-FX F1-86 an additional component D arises that has a decay time of 0.30 ns and that contributes up to 35% to the total fluorescence intensity. A comparison with a previous investigation of prothrombin fragment 1 demonstrates the extensive structural and functional homology between the N termini of prothrombin and factor X(a).
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Affiliation(s)
- A Häfner
- Institute of Physical Chemistry, University of Würzburg, Germany
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Ball LJ, Kühne R, Hoffmann B, Häfner A, Schmieder P, Volkmer-Engert R, Hof M, Wahl M, Schneider-Mergener J, Walter U, Oschkinat H, Jarchau T. Dual epitope recognition by the VASP EVH1 domain modulates polyproline ligand specificity and binding affinity. EMBO J 2000; 19:4903-14. [PMID: 10990454 PMCID: PMC314220 DOI: 10.1093/emboj/19.18.4903] [Citation(s) in RCA: 108] [Impact Index Per Article: 4.5] [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: 11/14/2022] Open
Abstract
The Ena-VASP family of proteins act as molecular adaptors linking the cytoskeletal system to signal transduction pathways. Their N-terminal EVH1 domains use groups of exposed aromatic residues to specifically recognize 'FPPPP' motifs found in the mammalian zyxin and vinculin proteins, and ActA protein of the intracellular bacterium Listeria monocytogenes. Here, evidence is provided that the affinities of these EVH1-peptide interactions are strongly dependent on the recognition of residues flanking the core FPPPP motifs. Determination of the VASP EVH1 domain solution structure, together with peptide library screening, measurement of individual K(d)s by fluorescence titration, and NMR chemical shift mapping, revealed a second affinity-determining epitope present in all four ActA EVH1-binding motifs. The epitope was shown to interact with a complementary hydrophobic site on the EVH1 surface and to increase strongly the affinity of ActA for EVH1 domains. We propose that this epitope, which is absent in the sequences of the native EVH1-interaction partners zyxin and vinculin, may provide the pathogen with an advantage when competing for the recruitment of the host VASP and Mena proteins in the infected cell.
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Affiliation(s)
- L J Ball
- Forschungsinstitut für Molekulare Pharmakologie, Alfred-Kowalke Strasse 4, D-10315, Berlin, Germany
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Bergström D, Boezio M, Carlson P, Francke T, Grinstein S, Khalchukov F, Suffert M, Hof M, Kremer J, Menn W, Simon M, Stephens SA, Ambriola ML, Bellotti R, Cafagna F, Ciacio F, Circella M, Finetti N, Papini P, Piccardi S, Spillantini P, Bartalucci S, Ricci M, Casolino M, Morselli A, Picozza P, Sparvoli R, Bonvicini V, Schiavon P, Vacchi A, Zampa N, Mitchell JW, Ormes JF, Streitmatter RE, Bravar U, Stochaj SJ. First Mass-resolved Measurement of High-Energy Cosmic-Ray Antiprotons. Astrophys J 2000; 534:L177-L180. [PMID: 10813676 DOI: 10.1086/312665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2000] [Accepted: 03/21/2000] [Indexed: 05/23/2023]
Abstract
We report new results for the cosmic-ray antiproton-to-proton ratio from 3 to 50 GeV at the top of the atmosphere. These results represent the first measurements, on an event-by-event basis, of mass-resolved antiprotons above 18 GeV. The results were obtained with the NMSU-WIZARD/CAPRICE98 balloon-borne magnet spectrometer equipped with a gas-RICH (Ring-Imaging Cerenkov) counter and a silicon-tungsten imaging calorimeter. The RICH detector was the first ever flown that is capable of identifying charge-one particles at energies above 5 GeV. The spectrometer was flown on 1998 May 28-29 from Fort Sumner, New Mexico. The measured p&d1;/p ratio is in agreement with a pure secondary interstellar production.
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Breivik T, Sluyter F, Hof M, Cools A. Differential susceptibility to periodontitis in genetically selected Wistar rat lines that differ in their behavioral and endocrinological response to stressors. Behav Genet 2000; 30:123-30. [PMID: 10979602 DOI: 10.1023/a:1001903221046] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.7] [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: 11/12/2022]
Abstract
This study tests the model presented previously by Breivik et al. (1996), in which the extent of periodontitis, an inflammatory disease, is predicted from the reactivity of the HPA-axis. Briefly, the model implies that elevated plasma levels of corticosterone modulate the immune system by shifting the T-helper balance toward a more Th2 response, which, alternately, increases the sensitivity to periodontitis. To test this model, two genetically distinct types of rats that differ both behaviorally and endocrinologically in their response to stress (high corticosterone responding APO-SUS rats and low corticosterone responding APO-UNSUS rats) were compared. Periodontitis was experimentally induced through the placement of a ligature and measured as the extent of tissue (fiber and bone) loss, both histologically and radiographically. The results show that, as expected, APO-SUS animals are more sensitive to periodontitis, i.e., show more fiber and bone loss, than APO-UNSUS animals. These data are in agreement with findings in Fischer and Lewis rats, as well as with corticosterone treated and adrenalectomized animals and suggest that genetic factors underlying the variation in the reactivity of the HPA-axis (and, accordingly, their behavioral response to stress) play an important a role in the development of inflammatory diseases.
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Affiliation(s)
- T Breivik
- Department of Periodontology, Faculty of Dentistry, University of Oslo, Norway.
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Ambriola M, Barbiellini G, Bartalucci S, Basini G, Bellotti R, Bergstroem D, Bocciolini M, Boezio M, Bravar U, Cafagna F, Carlson P, Casolino M, Castellano M, Ciacio F, Circella M, De Marzo C, De Pascale M, Finetti N, Francke T, Hof M, Kremer J, Menn W, Mitchell J, Morselli A, Ormes J, Papini P, Perego A, Piccardi S, Picozza P, Ricci M, Schiavon P, Simon M, Sparvoli R, Spillantini P, Stephens S, Stochaj S, Streitmatter R, Suffert M, Vacchi A, Weber N, Zampa N. CAPRICE98: A balloon borne magnetic spectrometer to study cosmic ray antimatter and composition at different atmospheric depths. ACTA ACUST UNITED AC 1999. [DOI: 10.1016/s0920-5632(99)00519-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Hutterer R, Schneider FW, Hermens WT, Wagenvoord R, Hof M. Binding of prothrombin and its fragment 1 to phospholipid membranes studied by the solvent relaxation technique. Biochim Biophys Acta 1998; 1414:155-64. [PMID: 9804936 DOI: 10.1016/s0005-2736(98)00163-1] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
The phospholipid headgroup mobility of small unilamellar vesicles composed of different mixtures of phosphatidyl-L-serine (PS) and phosphatidylcholine is characterized by the solvent relaxation behavior of the polarity sensitive dyes 6-propionyl-2-(dimethylamino)naphthalene (Prodan) and 6-palmitoyl-2-[trimethylammoniumethyl]-methylamino]naphthalene chloride (Patman). If the PS content exceeds 10%, the addition of calcium leads to a substantial deceleration of the solvent relaxation of both dyes, indicating the formation of Ca(PS)2 complexes. Addition of prothrombin and its fragment 1 leads to a further decrease of the headgroup mobility, as explained by the binding of more than two PS-molecules by a single protein molecule. Prodan monitors the outermost region of the bilayer and it clearly distinguishes between the binding of prothrombin and its fragment 1. The deeper incalated Patman does not distinguish between both proteins. The validity of the solvent relaxation technique for the investigation of the membrane binding of peripheral proteins is demonstrated by the studies of prothrombin induced changes in the steady-state fluorescence anisotropies of 1,6-diphenyl-1,3, 5-hexatriene.
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Affiliation(s)
- R Hutterer
- Institute for Physical Chemistry, University of Würzburg, D-97074 Würzburg, Germany
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Abstract
The wavelength-dependent tryptophan (Trp) fluorescence decays of Ca-prothrombin fragment 1 (Ca-BF1), which contains three tryptophan residues, in the presence of pure phosphatidylcholine (PC) small unilamellar vesicles (SUV) and PC-SUV containing either 25% phosphatidyl-l-serine (PS), and 25% or 40% phosphatidylglycerol (PG) are characterized, using fluorescence lifetime distribution, conventional multiexponential, and global analysis. In analogy to previous investigations on apo- and Ca-BF1 (M. Hof, G.R. Fleming, V. Fidler, Proteins Struct. Func. Genet. 24 (1996) 485-494), the analysis resulted in a five exponential decay model in all investigated systems, where the five fluorescence lifetimes (e.g. 0. 04+/-0.02 ns (component A), 0.24+/-0.02 ns (B), 0.66+/-0.03 ns (C), 2.4+/-0.3 ns (D), and 5.4+/-0.4 ns (E) for Ca-BF1 in the presence of PC-SUV) are wavelength-independent. The fluorescence lifetimes and the corresponding amplitudes of the 'Gla-Trp' (components D and E) and of the two 'kringle-Trp' (components B, C, and D) remain unchanged when bound to the PS-containing vesicles. Saturation binding to PG-containing membranes leads to a prolongation of the Gla component E from 5.3 in solution to 7.5 ns, indicating a change in the Gla-domain conformation. The results represent the first experimental evidence of a lipid-specific conformational change in the N-terminal 'Gla domain' of a vitamin K-dependent protein.
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Affiliation(s)
- M Hof
- J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejskova 3, 18223 Prague 8, Czech Republic.
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Kirschstein M, Hof M, Jensen R. Clinical quiz. Trichomoniasis. Pediatr Nephrol 1998; 12:257-8. [PMID: 9630049] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- M Kirschstein
- Department of Pediatrics, Medical University of Lübeck, Germany
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Lanig H, Hof M, Bringmann G, Schneider F. Time-resolved fluorescence spectroscopy of helically distorted aromatic systems. Chem Phys Lett 1997. [DOI: 10.1016/s0009-2614(97)00540-x] [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: 10/27/2022]
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Hutterer R, Schneider F, Hof M. Anisotropy and lifetime profiles for n-anthroyloxy fatty acids: a fluorescence method for the detection of bilayer interdigitation. Chem Phys Lipids 1997. [DOI: 10.1016/s0009-3084(97)02659-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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38
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Hutterer R, Schneider FW, Hof M. Time-resolved emission spectra and anisotropy profiles for symmetric diacyl- and dietherphosphatidylcholines. J Fluoresc 1997. [DOI: 10.1007/bf02764574] [Citation(s) in RCA: 20] [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: 11/30/2022]
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39
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Fuchs HM, Hof M, Mudogo V, Lawaczeck R. Fluorescence energy transfer on erythrocyte membranes. Gen Physiol Biophys 1997; 16:15-28. [PMID: 9290940] [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: 02/05/2023]
Abstract
Stationary and time-dependent fluorescence were measured for a donor/ acceptor (DA) pair bound to membrane proteins of bovine erythrocyte ghosts. The donor N-(p-(2-benzoxazolyl)phenyl)-maleimide (BMI) and the acceptor fluram bind to SH- and NH2-residues, respectively. The fluorescence spectra and the time-dependent emission were consistent with radiationless fluorescence energy transfer (RET). Band3 protein is the only membrane spanning protein with accessible SH-groups for the coupling of BMI molecules, and therefore only acceptor binding sites on the same band3 protein were counted by the RET measurements performed. A density of RET-effective acceptor binding sites c = 0.072 nm-2 was calculated on the basis of the two-dimensional Förster-kinetics.
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Affiliation(s)
- H M Fuchs
- Institute of Physical Chemistry, University of Würzburg, Germany
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Hutterer R, Schneider FW, Lanig H, Hof M. Solvent relaxation behaviour of n-anthroyloxy fatty acids in PC-vesicles and paraffin oil: a time-resolved emission spectra study. Biochim Biophys Acta 1997; 1323:195-207. [PMID: 9042343 DOI: 10.1016/s0005-2736(96)00186-1] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Time-resolved fluorescence measurements were performed for a set of n-anthroyloxy fatty acids (n-AS; n = 2, 3, 6, 9, 12, 16) in both solvent and vesicle systems. The Stokes' shifts and the mean relaxation times calculated from the time-resolved emission spectra (TRES) are shown to be strongly dependent on the position of the fluorophore in small unilamellar vesicles (SUV) composed of phosphatidylcholine (PC), while they are essentially independent of the fluorophore position in isotropic paraffin oil. The concept of an intramolecular relaxation process which had been suggested to explain the wavelength dependence of the emission behaviour of the n-AS dyes in viscous solvents is supported by semiempirical calculations showing that a more planar conformation is favoured in the excited compared to the ground state. However, in order to explain the results in vesicle systems, the concept of intramolecular relaxation is not sufficient. Rather, we show that intermolecular solvent relaxation processes play the dominant role for the wavelength dependent emission behaviour in polar, viscous environments.
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Affiliation(s)
- R Hutterer
- Institute for Physical Chemistry, University of Würzburg, Germany
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Hutterer R, Schneider FW, Sprinz H, Hof M. Binding and relaxation behaviour of prodan and patman in phospholipid vesicles: a fluorescence and 1H NMR study. Biophys Chem 1996; 61:151-60. [PMID: 8956486 DOI: 10.1016/s0301-4622(96)02185-0] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.0] [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: 02/03/2023]
Abstract
The relative location, binding behaviour and the solvent relaxation behaviour of the polarity sensitive membrane probes 6-propionyl-2-(dimethylamino)naphthalene and 6-palmitoyl-2-[[trimethylammoniumethyl]methylamino]naphthalene chloride in vesicles composed of 1,2-dimyristoyl-sn-glycero-3-phosphatidylcholine or egg yolk lecithin have been compared using steady-state and time-resolved fluorescence as well as high resolution NMR measurements. The reconstructed time-resolved emission spectra show unambiguously that the observed spectral shifts in vesicle systems have to be assigned to time-dependent solvent relaxation processes rather than to a probe relocation mechanism. All fluorescence as well as the NMR relaxation data suggest a deeper localization of Patman in the membrane, sensing a less polar and/or more restricted probe environment.
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Affiliation(s)
- R Hutterer
- Institute for Physical Chemistry, University of Wuerzburg, Germany
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Abstract
BACKGROUND In newborn the finding of adrenal gland hemorrhage is not uncommon. Only few cases of prenatal diagnosis of fetal adrenal bleeding by sonography have been reported. CASE In a 28-year-old nulliparous pregnant woman, routine sonography performed in 35 + 2 weeks of gestational age showed a cystic mass on the upper pole of the right kidney of a male fetus with normal biophysical profile and Doppler flow indices. Sonographic examination demonstrated a spontaneous remission within 3 weeks after uncomplicated vaginal delivery. CONCLUSION In the management of adrenal gland hemorrhage of the fetus or newborn, control of remission by sonography is a sufficient tool for differentiation against other tumors and is helpful in preventing unintended surgical removal of the adrenal gland.
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Affiliation(s)
- E Vollersen
- Department of Obstetrics and Gynecology, Medical University of Lübeck, Germany
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Parlowsky T, Bucsky P, Hof M, Kaatsch P. Malignant endocrine tumours in childhood and adolescence--results of a retrospective analysis. Klin Padiatr 1996; 208:205-9. [PMID: 8776707 DOI: 10.1055/s-2008-1046475] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
BACKGROUND Malignant endocrine tumours (MET) are rare neoplasms in childhood and data on such tumours are scarcely available. The aim of this retrospective study was to collect data over a period of 11 years (1984-1995) and to give the basis for a prospective study. PATIENTS AND METHOD 180 departments of paediatrics, nuclear medicine and children's surgery were asked for reporting of patients with MET by a questionnaire. 35% of the departments answered (however, 75% of the paediatric departments). RESULTS 96 children with MET were reported: 73 with thyroid cancer (50 papillary, 15 follicular, 7 medullar, 1 anaplastic; 1:1,9 boys to girls, both mean and median age 11 3/4 years), 12 with adrenocortical cancer and 11 with other malignant endocrine tumours. Metastases were found at diagnosis in 41 of 65 children with papillary or follicular carcinoma. 37 patients (pts.) are in first continuous complete remission (CCR), 4 in partial remission (PR) and in 24 (!) children the remission state or the outcome is not known. 6 of 7 children with medullary cancer have had metastases at diagnosis. 1 patient is in CCR, 1 patient is living in PR, 1 in relapse. 4 children are lost of follow up (lfu.). In sex-ratio no difference was found in 12 pts. suffering from adrenocortical cancer (mean age 5 1/4 years, median age 2 1/2 years). 11 tumours showed hormonal activity. 5 children disclosed metastases at diagnosis. All patients were treated by surgery, 6 received chemotherapy additionally. 4 children are living in CCR, 3 pts. in remission of unknown state, 4 died (all of them with metastases at diagnosis), 1 patient is lfu. The other MET reported: 8 carcinoids (7 x appendix, 1 x lung), 2 phaeochromocytomas, 1 islet cell cancer. 8 pts. are in CCR, 2 are lfu. The child with the islet cell carcinoma died. CONCLUSIONS Since only 35% of the clinics answered this retrospective analysis cannot give any statement about the incidence of MET in children. As to the prognosis thyroid cancer seems to have a favourable prognosis in childhood and adolescence. In contrast, metastatic adrenocortical cancer is incurable in this age group. Carcinoids of the appendix can be treated curatively by appendectomy. To better understand the biology of MET in children and adolescence and to achieve a better prognosis for some types of these tumours, much more data are needed. For these reason a multicenter prospective therapy study for childhood MET seems to be necessary.
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MESH Headings
- Adenocarcinoma, Follicular/epidemiology
- Adenocarcinoma, Follicular/mortality
- Adenocarcinoma, Follicular/therapy
- Adolescent
- Adrenal Cortex Neoplasms/epidemiology
- Adrenal Cortex Neoplasms/mortality
- Adrenal Cortex Neoplasms/therapy
- Carcinoma, Medullary/epidemiology
- Carcinoma, Medullary/mortality
- Carcinoma, Medullary/therapy
- Carcinoma, Papillary/epidemiology
- Carcinoma, Papillary/mortality
- Carcinoma, Papillary/therapy
- Child
- Child, Preschool
- Combined Modality Therapy
- Cross-Sectional Studies
- Female
- Germany/epidemiology
- Humans
- Incidence
- Infant
- Male
- Multiple Endocrine Neoplasia Type 2b/epidemiology
- Multiple Endocrine Neoplasia Type 2b/mortality
- Multiple Endocrine Neoplasia Type 2b/therapy
- Paraneoplastic Endocrine Syndromes/epidemiology
- Paraneoplastic Endocrine Syndromes/mortality
- Paraneoplastic Endocrine Syndromes/therapy
- Survival Rate
- Thyroid Neoplasms/epidemiology
- Thyroid Neoplasms/mortality
- Thyroid Neoplasms/therapy
- Treatment Outcome
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Affiliation(s)
- T Parlowsky
- Klinik für Pädiatrie, Medizinische Universität zu Lübeck
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Mitchell JW, Barbier LM, Christian ER, Krizmanic JF, Krombel K, Ormes JF, Streitmatter RE, Labrador AW, Davis A, Mewaldt RA, Schindler SM, Golden RL, Stochaj SJ, Webber WR, Menn W, Hof M, Reimer O, Simon M, Rasmussen IL. Measurement of 0.25-3.2 GeV antiprotons in the cosmic radiation. Phys Rev Lett 1996; 76:3057-3060. [PMID: 10060865 DOI: 10.1103/physrevlett.76.3057] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Abstract
The wavelength dependent fluorescence decay properties of bovine prothrombin fragment 1 have been investigated employing a picosecond time-correlated single photon counting technique. All observations are discussed with using the crystal structure (Soriano-Garcia et al., Biochemistry 31:2554-2566, 1992). Fluorescence lifetimes distribution and conventional multiexponential analysis, as well as acrylamide quenching studies lead to the identification of six distinguishable tryptophan excited-states. Accessibility to the quencher and the known structure are used to associate a fluorescence decay of the tryptophan present in the Gla domain (Trp42) with two red shifted components (2.3 and 4.9 ns). The two kringle domain tryptophans (Trp90 and Trp126) exhibit four decay times (0.06, 0.24, 0.68, and 2.3 ns), which are blue shifted. The calcium-induced fluorescence quenching is a result of static quenching: the five decay times remain unchanged, whereas the fluorescence intensity of Trp42 is decreased. The static quenching process is a consequence of a ground state interaction between the Cys18-Cys23 disulfide bridge and Trp42. The monomolecular equilibrium constant for this disulfide-pi-electron interaction is found as 4.8.
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Affiliation(s)
- M Hof
- Department of Physical Chemistry, Charles University, Prague, Czech Republic
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46
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Hof M, Hutterer R, Pérez N, Ruf H, Schneider FW. Influence of vesicle curvature on fluorescence relaxation kinetics of fluorophores. Biophys Chem 1994; 52:165-72. [PMID: 17020831 DOI: 10.1016/0301-4622(94)00093-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/1994] [Accepted: 05/26/1994] [Indexed: 11/24/2022]
Abstract
The effect of membrane curvature on the fluorescence decay of 2-p-toluidinyl-naphthalene-6-sulfonic acid (TNS), 2-(9-anthroyloxy) stearic acid (2-AS) and 12-(9-anthroyloxy)-stearic acid (12-AS) was investigated for egg lecithin vesicles of average diameter dm = 22 nm and 250 nm. The biexponential fluorescence decay of TNS at the red edge of the emission spectrum was analysed according to the model of Gonzalo and Montoro [1]. Over the entire temperature range (1-40 degrees C) the small TNS labelled vesicles showed significantly shorter solvent relaxation times tau(r) than their larger counterparts (e.g. 1.3 ns compared with 2.1 ns at 5 degrees C), indicating a higher mobility of the hydrated headgroups in the highly curved, small vesicles. The fluorescence decay of both AS derivatives is also biexponential. While the shorter decay times (1-3 ns) are practically identical for small and large vesicles, the longer decay times (5-14 ns) are identical only for 12-AS but not for 2-AS. This indicates that the microenvironment is similar in small and large vesicles deep in the membrane in spite of the differences in curvature.
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Affiliation(s)
- M Hof
- Department of Physical Chemistry, Charles University, 128 40 Prague 2, Albertov 2030, Czech Republic
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Lanig H, Hof M, Stahl T, Schneider F. Intramolecular deactivation of substituted quinolinium cations. Time-resolved fluorescence and semi-empirical calculations. Chem Phys Lett 1994. [DOI: 10.1016/0009-2614(94)00204-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Pearce KH, Hof M, Lentz BR, Thompson NL. Comparison of the membrane binding kinetics of bovine prothrombin and its fragment 1. J Biol Chem 1993; 268:22984-91. [PMID: 8226813] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Total internal reflection fluorescence microscopy has been used to compare the membrane binding characteristics of fluorescein-labeled bovine prothrombin and fluorescein-labeled bovine prothrombin fragment 1. The Ca(2+)-dependent association of these proteins with quartz-supported planar membranes composed of mixtures of phosphatidylserine (2-10 mol%) and phosphatidylcholine was examined. Equilibrium binding measurements showed that the apparent equilibrium dissociation constants increased with decreasing molar fractions of phosphatidylserine and that the dissociation constants were somewhat lower for intact prothrombin. Kinetic measurements, using fluorescence photobleaching recovery, showed that the measured dissociation rates were approximately equivalent for prothrombin and fragment 1 and did not change with the protein solution concentration or the molar fraction of phosphatidylserine. The kinetic data also implied that the surface binding mechanism for both proteins is more complex than a simple reversible reaction between monovalent proteins and monovalent surface sites. Measured equilibrium and kinetic constants are reported and compared for prothrombin and fragment 1 on planar membranes.
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Affiliation(s)
- K H Pearce
- Department of Chemistry, University of North Carolina, Chapel Hill 27599
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50
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Römke C, Froster-Iskenius U, Heyne K, Höhn W, Hof M, Grzejszczyk G, Rauskolb R, Rehder H, Schwinger E. Roberts syndrome and SC phocomelia. A single genetic entity. Clin Genet 1987; 31:170-7. [PMID: 3568444 DOI: 10.1111/j.1399-0004.1987.tb02790.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
A family with three siblings showing different manifestations of Roberts syndrome or SC phocomelia is described. With regard to previously published cases of familial Roberts syndrome and SC phocomelia we conclude that these two syndromes are one and the same genetic entity.
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