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Yang S, Di Lodovico E, Rupp A, Harms H, Fricke C, Miltner A, Kästner M, Maskow T. Enhancing insights: exploring the information content of calorespirometric ratio in dynamic soil microbial growth processes through calorimetry. Front Microbiol 2024; 15:1321059. [PMID: 38371938 PMCID: PMC10869564 DOI: 10.3389/fmicb.2024.1321059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2023] [Accepted: 01/04/2024] [Indexed: 02/20/2024] Open
Abstract
Catalytic activity of microbial communities maintains the services and functions of soils. Microbial communities require energy and carbon for microbial growth, which they obtain by transforming organic matter (OM), oxidizing a fraction of it and transferring the electrons to various terminal acceptors. Quantifying the relations between matter and energy fluxes is possible when key parameters such as reaction enthalpy (∆rH), energy use efficiency (related to enthalpy) (EUE), carbon use efficiency (CUE), calorespirometric ratio (CR), carbon dioxide evolution rate (CER), and the apparent specific growth rate (μ app ) are known. However, the determination of these parameters suffers from unsatisfying accuracy at the technical (sample size, instrument sensitivity), experimental (sample aeration) and data processing levels thus affecting the precise quantification of relationships between carbon and energy fluxes. To address these questions under controlled conditions, we analyzed microbial turnover processes in a model soil amended using a readily metabolizable substrate (glucose) and three commercial isothermal microcalorimeters (MC-Cal/100P, TAM Air and TAM III) with different sample sizes meaning varying volume-related thermal detection limits (LODv) (0.05- 1 mW L-1). We conducted aeration experiments (aerated and un-aerated calorimetric ampoules) to investigate the influence of oxygen limitation and thermal perturbation on the measurement signal. We monitored the CER by measuring the additional heat caused by CO2 absorption using a NaOH solution acting as a CO2 trap. The range of errors associated with the calorimetrically derived μ app , EUE, and CR was determined and compared with the requirements for quantifying CUE and the degree of anaerobicity (η A ) . Calorimetrically derived μ app and EUE were independent of the instrument used. However, instruments with a low LODv yielded the most accurate results. Opening and closing the ampoules for oxygen and CO2 exchange did not significantly affect metabolic heats. However, regular opening during calorimetrically derived CER measurements caused significant measuring errors due to strong thermal perturbation of the measurement signal. Comparisons between experimentally determined CR, CUE,η A , and modeling indicate that the evaluation of CR should be performed with caution.
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Affiliation(s)
- Shiyue Yang
- Helmholtz Centre for Environmental Research – UFZ, Leipzig, Germany
| | - Eliana Di Lodovico
- Helmholtz Centre for Environmental Research – UFZ, Leipzig, Germany
- Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau (RPTU), Landau in der Pfalz, Germany
| | - Alina Rupp
- Helmholtz Centre for Environmental Research – UFZ, Leipzig, Germany
| | - Hauke Harms
- Helmholtz Centre for Environmental Research – UFZ, Leipzig, Germany
| | - Christian Fricke
- Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau (RPTU), Landau in der Pfalz, Germany
| | - Anja Miltner
- Helmholtz Centre for Environmental Research – UFZ, Leipzig, Germany
| | - Matthias Kästner
- Helmholtz Centre for Environmental Research – UFZ, Leipzig, Germany
| | - Thomas Maskow
- Helmholtz Centre for Environmental Research – UFZ, Leipzig, Germany
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Fricke C, Voderholzer U. Endocrinology of Underweight and Anorexia Nervosa. Nutrients 2023; 15:3509. [PMID: 37630700 PMCID: PMC10458831 DOI: 10.3390/nu15163509] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Revised: 07/27/2023] [Accepted: 08/04/2023] [Indexed: 08/27/2023] Open
Abstract
More than any other mental illness, the course, prognosis, and therapy of anorexia nervosa are shaped by the physical changes associated with being underweight. This article provides an overview of the endocrine changes associated with malnutrition and underweight. This overview serves as a basis for understanding the other articles in this special issue, which deal with the health risks associated with being underweight. In this context, the differences between underweight in anorexia nervosa and in constitutional thinness are of particular importance in assessing the impact of intentional weight loss. In this context, the regulation of hunger and satiety deserves special interest, as this is the area in which the intentional influence on body weight comes into play. Clinical consequences on, for example, fertility, bone metabolism, the homeostasis of, for example, serum glucose levels, or body temperature have been observed for a long time; nonetheless, the medical responses, apart from vitamin supplementations and advice to gain weight, are still limited. Therefore, emphasis was placed on the potential improvement of outcomes through the administration of central or peripheral hormones. Studies were identified on PubMed via a selection of relevant keywords; original texts that were cited in reviews were studied where it was advantageous. This review found some promising data on bone health and the administration of transdermal oestrogen, which is not yet widely used, as well as distinct hormonal markers to differentiate between CT and AN. We concluded that the continuous efforts to investigate the role of endocrinology in underweight and/or anorexia nervosa lead to outcome benefits and that more and higher-powered studies are needed.
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Affiliation(s)
| | - Ulrich Voderholzer
- Schoen Klinik Roseneck, 83209 Prien am Chiemsee, Germany;
- Klinik für Psychiatrie und Psychotherapie, Ludwig Maximilians Universität, 80336 Munich, Germany
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Borusiak P, Mazheika Y, Bauer S, Haberlandt E, Krois I, Fricke C, Simon L, Beschoner P, Jerg-Bretzke L, Geiser F, Hiebel N, Weidner K, Albus C, Morawa E, Erim Y. The impact of the COVID-19 pandemic on pediatric developmental services: a cross-sectional study on overall burden and mental health status. Arch Public Health 2022; 80:113. [PMID: 35395839 PMCID: PMC8990278 DOI: 10.1186/s13690-022-00876-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Accepted: 03/31/2022] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The COVID-19 outbreak has taken a heavy toll on the mental well-being of healthcare workers, even those who have not been directly involved in the care of acutely ill patients. The aims of this study were to identify the overall burden and mental health status of healthcare workers in pediatric developmental services under the influence of the COVID-19 pandemic, and to identify the risk and protective factors associated with mental health. METHODS This cross-sectional web-based study was part of a large multicenter VOICE study conducted among employees ((neuro-)pediatricians, psychologists, speech therapists, occupational therapists, etc.) from various pediatric developmental services between June and July 2020. A total of 1291 questionnaires regarding overall burden, mental health status (depression, generalized anxiety disorder and emotional exhaustion) and risk and protective factors for mental health (working conditions, potential problems during the COVID-19 pandemic and psychological resources) were analyzed. Descriptive statistics and multiple linear regression were used for data analysis. RESULTS A total of 44.5% (574/1291) participants felt a high or very high overall burden during the COVID-19 pandemic. Of all the participants, 14.6% (171/1173) reported clinically significant levels of depressive symptoms, 17.0% (199/1173) reported generalized anxiety disorder symptoms and 44.6% (532/1192) reported emotional exhaustion. Multiple linear regression analyses identified several common risk and protective factors for mental health status variables. The burden of an increase in the quantity of work, fear of work and fear of becoming infected showed the strongest negative associations, whereas psychological resources and sufficient relaxation in leisure time exhibited the strongest positive associations. CONCLUSION Employees who were not directly involved in the care of acutely ill patients were also exposed to considerable stress, some of which was not different from that experienced by professionals who were directly affected. These employees should not be lost sight of and must be offered appropriate support.
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Affiliation(s)
- Peter Borusiak
- Witten/Herdecke University, Witten, Germany. .,Wagener-Foundation for Social Pediatrics, Emsdetten, Germany.
| | - Yuliya Mazheika
- Wagener-Foundation for Social Pediatrics, Emsdetten, Germany
| | - Susanne Bauer
- Aks - Arbeitskreis für Vorsorge- und Sozialmedizin, Bregenz, Austria
| | - Edda Haberlandt
- Aks - Arbeitskreis für Vorsorge- und Sozialmedizin, Bregenz, Austria.,Kinderklinik Dornbirn, Dornbirn, Austria
| | | | - Christian Fricke
- VIFF - Vereinigung für Interdisziplinäre Frühförderung - Bundesvereinigung, Hamburg, Germany.,Hochschule Nordhausen - University of Applied Sciences (UAS), Nordhausen, Germany
| | - Liane Simon
- VIFF - Vereinigung für Interdisziplinäre Frühförderung - Bundesvereinigung, Hamburg, Germany.,MSH Medical School Hamburg, Hamburg, Germany
| | - Petra Beschoner
- Department of Psychosomatic Medicine and Psychotherapy, Ulm University Medical Center, Ulm, Germany
| | - Lucia Jerg-Bretzke
- Department of Psychosomatic Medicine and Psychotherapy, Ulm University Medical Center, Ulm, Germany
| | - Franziska Geiser
- Department of Psychosomatic Medicine and Psychotherapy, University Clinic of Bonn, Bonn, Germany
| | - Nina Hiebel
- Department of Psychosomatic Medicine and Psychotherapy, University Clinic of Bonn, Bonn, Germany
| | - Kerstin Weidner
- Department of Psychotherapy and Psychosomatic Medicine, Faculty of Medicine, Technische Universität Dresden, Dresden, Germany
| | - Christian Albus
- Department of Psychosomatics and Psychotherapy, University Hospital of Cologne, Cologne, Germany
| | - Eva Morawa
- Department of Psychosomatic Medicine and Psychotherapy, University Hospital of Erlangen, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - Yesim Erim
- Department of Psychosomatic Medicine and Psychotherapy, University Hospital of Erlangen, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Erlangen, Germany
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Fricke C, Xu J, Jiang F, Liu Y, Harms H, Maskow T. Rapid culture-based detection of Legionella pneumophila using isothermal microcalorimetry with an improved evaluation method. Microb Biotechnol 2020; 13:1262-1272. [PMID: 32212253 PMCID: PMC7264898 DOI: 10.1111/1751-7915.13563] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [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: 10/25/2019] [Accepted: 03/02/2020] [Indexed: 12/01/2022] Open
Abstract
The detection and quantification of Legionella pneumophila (responsible for legionnaire's disease) in water samples can be achieved by various methods. However, the culture-based ISO 11731:2017, which is based on counts of colony-forming units per ml (CFU·ml-1 ) is still the gold standard for quantification of Legionella species (spp.). As a powerful alternative, we propose real-time monitoring of the growth of L. pneumophila using an isothermal microcalorimeter (IMC). Our results demonstrate that, depending on the initial concentration of L. pneumophila, detection times of 24-48 h can be reliably achieved. IMC may, therefore, be used as an early warning system for L. pneumophila contamination. By replacing only visual detection of growth by a thermal sensor, but otherwise maintaining the standardized protocol of the ISO 11731:2017, the new procedure could easily be incorporated into existing standards. The exact determination of the beginning of metabolic heat is often very difficult because at the beginning of the calorimetric signal the thermal stabilization and the metabolic heat development overlap. Here, we propose a new data evaluation based on the first derivation of the heat flow signal. The improved evaluation method can further reduce detection times and significantly increase the reliability of the IMC approach.
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Affiliation(s)
- Christian Fricke
- Department of Environmental MicrobiologyHelmholtz‐Centre for Environmental Research – UFZLeipzigGermany
| | - Juan Xu
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education)College of Chemistry and Molecular SciencesWuhan UniversityWuhan430072China
| | - Feng‐Lei Jiang
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education)College of Chemistry and Molecular SciencesWuhan UniversityWuhan430072China
| | - Yi Liu
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education)College of Chemistry and Molecular SciencesWuhan UniversityWuhan430072China
| | - Hauke Harms
- Department of Environmental MicrobiologyHelmholtz‐Centre for Environmental Research – UFZLeipzigGermany
| | - Thomas Maskow
- Department of Environmental MicrobiologyHelmholtz‐Centre for Environmental Research – UFZLeipzigGermany
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Alizadeh J, Fricke C, Woost T, Zakhary N, Classen J. P71 Evaluation of different algorithms for the automatic classification of gait disorders in small sample sizes. Clin Neurophysiol 2020. [DOI: 10.1016/j.clinph.2019.12.072] [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: 11/25/2022]
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Alizadeh J, Unterlauft A, Fricke C, Classen J. P70 Differentiation of grasp execution of healthy elder and younger subjects using machine learning algorithms. Clin Neurophysiol 2020. [DOI: 10.1016/j.clinph.2019.12.071] [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: 11/25/2022]
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Fricke C, Harms H, Maskow T. Rapid Calorimetric Detection of Bacterial Contamination: Influence of the Cultivation Technique. Front Microbiol 2019; 10:2530. [PMID: 31736935 PMCID: PMC6838224 DOI: 10.3389/fmicb.2019.02530] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [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: 06/24/2019] [Accepted: 10/21/2019] [Indexed: 11/13/2022] Open
Abstract
Modern isothermal microcalorimeters (IMC) are able to detect the metabolic heat of bacteria with an accuracy sufficient to recognize even the smallest traces of bacterial contamination of water, food, and medical samples. The modern IMC techniques are often superior to conventional detection methods in terms of the detection time, reliability, labor, and technical effort. What is missing is a systematic analysis of the influence of the cultivation conditions on calorimetric detection. For the acceptance of IMC techniques, it is advantageous if already standardized cultivation techniques can be combined with calorimetry. Here we performed such a systematic analysis using Lactobacillus plantarum as a model bacterium. Independent of the cultivation techniques, IMC detections were much faster for high bacterial concentrations (>102 CFU⋅mL-1) than visual detections. At low bacterial concentrations (<102 CFU⋅mL-1), detection times were approximately the same. Our data demonstrate that all kinds of traditional cultivation techniques like growth on agar (GOA) or in agar (GIA), in liquid media (GL) or on agar after enrichment via membrane filtration (GF) can be combined with IMC. The order of the detection times was GF < GIA ≈ GL ≈ GOA. The observed linear relationship between the calorimetric detection times and the initial bacterial concentrations can be used to quantify the bacterial contamination. Further investigations regarding the correlation between the filling level (in mm) of the calorimetric vessel and the specific maximum heat flow (in μW⋅g-1) illustrated two completely different results for liquid and solid media. Due to the better availability of substrates and the homogeneous distribution of bacteria growing in a liquid medium, the volume-related maximum heat flow was independent on the filling level of the calorimetric vessels. However, in a solid medium, the volume-related maximum heat flow approached a threshold and achieved a maximum at low filling levels. This fundamentally different behavior can be explained by the spatial limitation of the growth of bacterial colonies and the reduced substrate supply due to diffusion.
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Affiliation(s)
| | | | - Thomas Maskow
- Department of Environmental Microbiology, Helmholtz Centre for Environmental Research – UFZ, Leipzig, Germany
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9
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Fritz LM, Domin S, Thies A, Yang J, Stolle M, Fricke C, Petermann F. Profitieren psychisch erkrankte Eltern und psychisch belastete Kinder von einer gemeinsamen Eltern-Kind-Behandlung? Kindheit und Entwicklung 2018. [DOI: 10.1026/0942-5403/a000264] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Zusammenfassung. Es wird überprüft, ob die Teilnahme am Gruppenprogramm SEEK (Seelische Erkrankungen, Eltern und Kinder) für psychisch erkrankte Eltern im Rahmen einer stationären Eltern-Kind-Behandlung kurz- und längerfristige additive Behandlungseffekte erbringt hinsichtlich psychischer Symptome der Eltern (erfasst mit der Hopkins-Symptom-Checkliste-25; HSCL-25), der elterlichen Stressbelastung (erfasst mit dem Eltern-Belastungs-Inventar; EBI) sowie psychischer und körperlicher Symptome des Kindes (erfasst mit der Child Behavior Checklist; CBCL). Die Vergleichsgruppe (n = 11), die das übliche Behandlungsprogramm durchlief, und die Interventionsgruppe (n = 15), die zusätzlich an SEEK teilnahm, werden zu drei Messzeitpunkten (t1 bei Aufnahme, t2 bei Entlassung und t3 sechs Monate nach Entlassung) miteinander verglichen. Additive Effekte des Gruppenprogramms können bei dieser Untersuchung im umfangreichen stationären Behandlungssetting nicht belegt werden. Beide Gruppen erscheinen (mit Ausnahme zweier CBCL-Skalen im t1-t2-Vergleich) vergleichbar bezüglich ihres Behandlungserfolgs. Es zeigen sich sowohl kurzfristige Effekte als auch längerfristig stabile Effekte der stationären Eltern-Kind-Behandlung im 6-Monats-Follow-Up.
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Affiliation(s)
- Lisa-Marina Fritz
- Abteilung für Kinder- und Jugendpsychiatrie und -psychotherapie, Eltern-Kind-Klinik, Evangelisches Krankenhaus Alsterdorf im Verbund mit dem Werner Otto Institut, Hamburg
| | - Sabine Domin
- Abteilung für Psychiatrie und Psychotherapie, Evangelisches Krankenhaus Alsterdorf, Hamburg
| | - Annekatrin Thies
- Abteilung für Kinder- und Jugendpsychiatrie und -psychotherapie, Eltern-Kind-Klinik, Evangelisches Krankenhaus Alsterdorf im Verbund mit dem Werner Otto Institut, Hamburg
| | - Julia Yang
- Abteilung für Kinder- und Jugendpsychiatrie und -psychotherapie, Eltern-Kind-Klinik, Evangelisches Krankenhaus Alsterdorf im Verbund mit dem Werner Otto Institut, Hamburg
| | - Martin Stolle
- Abteilung für Kinder- und Jugendpsychiatrie und -psychotherapie, Eltern-Kind-Klinik, Evangelisches Krankenhaus Alsterdorf im Verbund mit dem Werner Otto Institut, Hamburg
| | - Christian Fricke
- Abteilung für Kinder- und Jugendpsychiatrie und -psychotherapie, Eltern-Kind-Klinik, Evangelisches Krankenhaus Alsterdorf im Verbund mit dem Werner Otto Institut, Hamburg
| | - Franz Petermann
- Zentrum für Klinische Psychologie und Rehabilitation der Universität Bremen
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Fritz L, Domin S, Yang J, Thies A, Stolle M, Petermann F, Fricke C. Behandlung psychisch erkrankter Eltern: das Gruppenprogramm SEEK. Psychotherapeut 2018. [DOI: 10.1007/s00278-018-0297-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Fricke C, Gentner R, Weise D, Rumpf J, Claßen J. REMOVED: PB 17 Short-term shaping of cortico-muscular synergies. Clin Neurophysiol 2017. [DOI: 10.1016/j.clinph.2017.06.073] [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: 10/18/2022]
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Abstract
Sperm competition is pervasive and fundamental to determining a male's overall fitness. Sperm traits and seminal fluid proteins (Sfps) are key factors. However, studies of sperm competition may often exclude females that fail to remate during a defined period. Hence, the resulting data sets contain fewer data from the potentially fittest males that have most success in preventing female remating. It is also important to consider a male's reproductive success before entering sperm competition, which is a major contributor to fitness. The exclusion of these data can both hinder our understanding of the complete fitness landscapes of competing males and lessen our ability to assess the contribution of different determinants of reproductive success to male fitness. We addressed this here, using the Drosophila melanogaster model system, by (i) capturing a comprehensive range of intermating intervals that define the fitness of interacting wild-type males and (ii) analysing outcomes of sperm competition using selection analyses. We conducted additional tests using males lacking the sex peptide (SP) ejaculate component vs. genetically matched (SP+ ) controls. This allowed us to assess the comprehensive fitness effects of this important Sfp on sperm competition. The results showed a signature of positive, linear selection in wild-type and SP+ control males on the length of the intermating interval and on male sperm competition defence. However, the fitness surface for males lacking SP was distinct, with local fitness peaks depending on contrasting combinations of remating intervals and offspring numbers. The results suggest that there are alternative routes to success in sperm competition and provide an explanation for the maintenance of variation in sperm competition traits.
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Affiliation(s)
- C. Fricke
- School of Biological SciencesUniversity of East AngliaNorwich Research ParkNorwichUK
- Institute for Evolution and BiodiversityUniversity of MuensterMuensterGermany
| | - T. Chapman
- School of Biological SciencesUniversity of East AngliaNorwich Research ParkNorwichUK
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Affiliation(s)
- S. Meyer
- SIBIS Institute for Social Research and Technology Consulting in Berlin, Berlin, Germany
| | - C. Fricke
- SIBIS Institute for Social Research and Technology Consulting in Berlin, Berlin, Germany
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Fricke C, Woost T, Claßen J. EP 65. Non-invasive brain stimulation for the treatment of Parkinson’s disease – A pilot study. Clin Neurophysiol 2016. [DOI: 10.1016/j.clinph.2016.05.116] [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: 11/17/2022]
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15
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Duesmann C, Fricke C, Henn P, Claßen J, Duesmann C, Fricke C, Henn P, Claßen J. EP 141. Physiological effects of subthreshold conditioning TMS anterior of the primary motor cortex. Clin Neurophysiol 2016. [DOI: 10.1016/j.clinph.2016.05.180] [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: 11/28/2022]
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16
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Gleisner M, Kroppen B, Fricke C, Teske N, Kliesch TT, Janshoff A, Meinecke M, Steinem C. Epsin N-terminal Homology Domain (ENTH) Activity as a Function of Membrane Tension. J Biol Chem 2016; 291:19953-61. [PMID: 27466364 DOI: 10.1074/jbc.m116.731612] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2016] [Indexed: 12/18/2022] Open
Abstract
The epsin N-terminal homology domain (ENTH) is a major player in clathrin-mediated endocytosis. To investigate the influence of initial membrane tension on ENTH binding and activity, we established a bilayer system based on adhered giant unilamellar vesicles (GUVs) to be able to control and adjust the membrane tension σ covering a broad regime. The shape of each individual adhered GUV as well as its adhesion area was monitored by spinning disc confocal laser microscopy. Control of σ in a range of 0.08-1.02 mN/m was achieved by altering the Mg(2+) concentration in solution, which changes the surface adhesion energy per unit area of the GUVs. Specific binding of ENTH to phosphatidylinositol 4,5-bisphosphate leads to a substantial increase in adhesion area of the sessile GUV. At low tension (<0.1 mN/m) binding of ENTH can induce tubular structures, whereas at higher membrane tension the ENTH interaction deflates the sessile GUV and thereby increases the adhesion area. The increase in adhesion area is mainly attributed to a decrease in the area compressibility modulus KA We propose that the insertion of the ENTH helix-0 into the membrane is largely responsible for the observed decrease in KA, which is supported by the observation that the mutant ENTH L6E shows a reduced increase in adhesion area. These results demonstrate that even in the absence of tubule formation, the area compressibility modulus and, as such, the bending rigidity of the membrane is considerably reduced upon ENTH binding. This renders membrane bending and tubule formation energetically less costly.
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Affiliation(s)
- Martin Gleisner
- From the Institute of Organic and Biomolecular Chemistry, University of Göttingen, Tammannstrasse 2, 37077 Göttingen, Germany
| | - Benjamin Kroppen
- Department of Cellular Biochemistry, University of Göttingen, Humboldtallee 23, 37073 Göttingen, Germany
| | - Christian Fricke
- From the Institute of Organic and Biomolecular Chemistry, University of Göttingen, Tammannstrasse 2, 37077 Göttingen, Germany
| | - Nelli Teske
- From the Institute of Organic and Biomolecular Chemistry, University of Göttingen, Tammannstrasse 2, 37077 Göttingen, Germany
| | - Torben-Tobias Kliesch
- Institute of Physical Chemistry, University of Göttingen, Tammannstrasse 6, 37077 Göttingen, Germany, and
| | - Andreas Janshoff
- Institute of Physical Chemistry, University of Göttingen, Tammannstrasse 6, 37077 Göttingen, Germany, and Göttingen Center for Molecular Biosciences, 37077 Göttingen, Germany
| | - Michael Meinecke
- Department of Cellular Biochemistry, University of Göttingen, Humboldtallee 23, 37073 Göttingen, Germany, European Neuroscience Institute, 37073 Göttingen, Germany,
| | - Claudia Steinem
- From the Institute of Organic and Biomolecular Chemistry, University of Göttingen, Tammannstrasse 2, 37077 Göttingen, Germany, Göttingen Center for Molecular Biosciences, 37077 Göttingen, Germany
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Sato N, Fricke C, McGuckin C, Forraz N, Degoul O, Atzeni G, Sakurai H. Cord blood processing by a novel filtration system. Cell Prolif 2015; 48:671-81. [PMID: 26456086 PMCID: PMC6496033 DOI: 10.1111/cpr.12217] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2015] [Accepted: 07/30/2015] [Indexed: 12/11/2022] Open
Abstract
Objectives Availability of cord blood (CB) processing has been limited by the need for electrically aided centrifugal techniques, which often produce only low final cell product yield. Here, we describe development and characterization of a novel filter device aimed at allowing CB processing, using gentle gravity‐led flow. Materials and methods CB was processed with a novel filter device (CellEffic CB, consisting of non‐woven fabric), without any centrifugation. Cells were harvested by flushing the filter with either HES or physiological saline solution (SALINE). Differential cell counts and viability analysis, combined with Fluorescence‐Activated Cell Sorting (FACS) (total nucleated cells [TNC], mononuclear cells [MNC], CD45+ CD34+ cells, hematopoietic precursor cells [HPCs]) and clonogenic assay, were employed for analysis of CB pre‐ and post‐processing, and after freeze/thawing. Results Processing using the novel filter yielded high quality RBC depletion while maintaining good recovery of TNC, MNC, CD34+, HPCs and colony forming unit (CFU) output. The filter performed equally well using HES or SALINE. Gravity‐led flow provided gentle cell movement and protection of the stem cell compartment. Post‐thaw CFU output was maintained particularly, an important indicator for CB banking. Conclusions Geographical limitations of CB transplantation and banking have required a non‐electrical, non‐centrifugal solution. This novel filter CellEffic CB device revealed rapid yet gentle cell processing while maintaining the stem/progenitor cell compartment required for both haematological and regenerative medicine therapies.
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Affiliation(s)
- N Sato
- Medical Devices Division, Kaneka Corporation, Osaka, 530-8288, Japan
| | - C Fricke
- Kaneka Pharma Europe N.V. German Branch, DE-65760, Eschborn, Germany
| | - C McGuckin
- CTI-BIOTECH, Cell Therapy Research Institute, 69330, MEYZIEU-LYON, France
| | - N Forraz
- CTI-BIOTECH, Cell Therapy Research Institute, 69330, MEYZIEU-LYON, France
| | - O Degoul
- CTI-BIOTECH, Cell Therapy Research Institute, 69330, MEYZIEU-LYON, France
| | - G Atzeni
- CTI-BIOTECH, Cell Therapy Research Institute, 69330, MEYZIEU-LYON, France
| | - H Sakurai
- Kaneka Pharma Europe N.V. German Branch, DE-65760, Eschborn, Germany
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Weise D, Adamidis M, Rumpf JJ, Fricke C, Classen J. P184. Heart rate variability and its modulation by auricular branch of vagus nerve stimulation in Parkinson’s disease. Clin Neurophysiol 2015. [DOI: 10.1016/j.clinph.2015.04.280] [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: 12/01/2022]
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19
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Rumpf JJ, Hinselmann K, Fricke C, Weise D, Classen J. P148. Timing of post-training transcranial direct current stimulation to enhance consolidation of motor sequence learning in older people. Clin Neurophysiol 2015. [DOI: 10.1016/j.clinph.2015.04.219] [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: 10/23/2022]
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20
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Fricke C, Adler MI, Brooks RC, Bonduriansky R. The complexity of male reproductive success: effects of nutrition, morphology, and experience. Behav Ecol 2015. [DOI: 10.1093/beheco/aru240] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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21
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Fricke S, Rothe K, Hilger N, Ackermann M, Oelkrug C, Fricke C, Schönfelder U, Niederwieser D, Emmrich F, Sack U. Allogeneic bone marrow grafts with high levels of CD4 + CD25 + FoxP3 + T cells can lead to engraftment failure. Cytometry A 2015; 87:279-280. [PMID: 25631159 DOI: 10.1002/cyto.a.22639] [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: 11/09/2022]
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22
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Oelkrug C, Hilger N, Schönfelder U, Boltze J, Sack U, Fricke C, Hildebrandt G, Keller T, Emmrich F, Fricke S. Modelling hematological parameters after total body irradiation. Int J Radiat Biol 2014; 90:538-46. [PMID: 24605769 DOI: 10.3109/09553002.2014.899443] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
PURPOSE The time- and dose-dependent reconstitution of hematopoiesis after radiation exposure is strongly related to the stem cell population and can be used to predict hematological parameters. These parameters allow further insight into the hematopoietic system and might lead to the development of novel stem cell transplantation models. MATERIALS AND METHODS CD4-/- C57Bl/6 mice, transgenic for human CD4 and HLA-DR3, were irradiated in a single (3, 6, 8 and 12 Gy) and fractionated (6 × 1 Gy, 6 × 1.5 Gy, 6 × 2 Gy; twice daily) dose regimen. Blood was analyzed weekly for red blood cells (RBC), hemoglobin concentration (Hb), hematocrit (HCT) and white blood cells (WBC). Organ and tissue damage after irradiation were examined by histopathology. RESULTS The recovery curves for RBC, Hb, HCT and WBC showed the same velocity (< 1 week) for all radiation doses (3-12 Gy) starting at different, dose-dependent times. The only dose-dependent parameter was defined by the beginning of the recovery process (dose-dependent shift) and higher doses were related to a later recovery of the hematopoietic system. The RBC, Hb and HCT recovery was followed by a saturation curve reaching a final concentration independent of the radiation dose. Histological analysis of the bone marrow in the single dose cohort showed a dose-dependent reduction of the cellularity in the bone marrow cavities. The fractioned radiation dose cohort resulted in a regeneration of all bone marrow cavities. CONCLUSION Specific functions were developed to describe the reconstitution of hematological parameters after total body irradiation.
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Affiliation(s)
- Christopher Oelkrug
- Fraunhofer Institute for Cell Therapy and Immunology (IZI) , Leipzig , Germany
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23
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Müller C, Ringleb S, Fricke C. [43-year-old patient with syncope]. Dtsch Med Wochenschr 2013; 138:2597-8. [PMID: 24301493 DOI: 10.1055/s-0033-1359888] [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: 10/26/2022]
Affiliation(s)
- C Müller
- Innere Abteilung, Helios Klinik Sangerhausen
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Fricke C, Rumpf JJ, Gentner R, Claßen J. Topographische Verteilung von Synergien aus TMS-induzierten Fingerbewegungen – eine Pilotstudie. KLIN NEUROPHYSIOL 2013. [DOI: 10.1055/s-0033-1337165] [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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25
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Rumpf JJ, Wegscheider M, Fricke C, Weise D, Claßen J. Einfluss der offline-Applikation von transkranieller Gleichstromstimulation auf die Konsolidierung motorischen Lernens bei älteren gesunden Probanden. KLIN NEUROPHYSIOL 2013. [DOI: 10.1055/s-0033-1337131] [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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26
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Fricke S, Hilger N, Oelkrug C, Rodloff AC, Fricke C. Differentiation of fungi using hybridization probes on the LightCycler(®). Methods Mol Biol 2013; 968:93-104. [PMID: 23296888 DOI: 10.1007/978-1-62703-257-5_7] [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: 01/24/2023]
Abstract
The polymerase chain reaction is a powerful molecular tool for the detection and analysis of very small amounts of DNA. Today, hybridization probes are often used in real-time PCR for more sensitive and specific detection of pathogens and for determination of gene regulation or mutation analysis instead of intercalating dyes like SYBR Green. Here, we describe how to generate suitable primers and hybridization probes for the specific detection of fungal DNA. Furthermore, we show the advantages of hybridization probes using the LightCycler-PCR for the detection of different Candida spp. and Aspergillus spp. in patient blood samples. The methods used to develop such PCR assays will also be presented in the following protocol.
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Affiliation(s)
- Stephan Fricke
- Fraunhofer Institute for Cell Therapy and Immunology (IZI), Leipzig, Germany.
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27
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Fricke S, Rothe K, Hilger N, Ackermann M, Oelkrug C, Fricke C, Schönfelder U, Niederwieser D, Emmrich F, Sack U. Allogeneic bone marrow grafts with high levels of CD4+CD25+FoxP3+ T cells can lead to engraftment failure. Cytometry A 2012; 81:476-88. [DOI: 10.1002/cyto.a.22061] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2011] [Revised: 02/08/2012] [Accepted: 03/29/2012] [Indexed: 01/02/2023]
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Übelmesser A, Classen J, Gentner R, Fricke C. Vergleichende modulare Analyse von Greifmustern bei jungen und alten Probanden: Nachweis von impliziter Expertise. KLIN NEUROPHYSIOL 2012. [DOI: 10.1055/s-0032-1301593] [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: 10/28/2022]
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29
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Ubbelohde N, Fricke C, Flindt C, Hohls F, Haug RJ. Measurement of finite-frequency current statistics in a single-electron transistor. Nat Commun 2012; 3:612. [PMID: 22215087 PMCID: PMC3272564 DOI: 10.1038/ncomms1620] [Citation(s) in RCA: 121] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2011] [Accepted: 11/28/2011] [Indexed: 11/09/2022] Open
Abstract
Electron transport in nanoscale structures is strongly influenced by the Coulomb interaction that gives rise to correlations in the stream of charges and leaves clear fingerprints in the fluctuations of the electrical current. A complete understanding of the underlying physical processes requires measurements of the electrical fluctuations on all time and frequency scales, but experiments have so far been restricted to fixed frequency ranges, as broadband detection of current fluctuations is an inherently difficult experimental procedure. Here we demonstrate that the electrical fluctuations in a single-electron transistor can be accurately measured on all relevant frequencies using a nearby quantum point contact for on-chip real-time detection of the current pulses in the single-electron device. We have directly measured the frequency-dependent current statistics and, hereby, fully characterized the fundamental tunnelling processes in the single-electron transistor. Our experiment paves the way for future investigations of interaction and coherence-induced correlation effects in quantum transport.
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Affiliation(s)
- Niels Ubbelohde
- Institut für Festkörperphysik, Leibniz Universität Hannover, Hannover 30167, Germany
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Fricke S, Fricke C, Oelkrug C, Blatz R, Schönfelder U, Niederwieser D, Hilger N, Ruhnke M, Rodloff AC. A real-time PCR for the detection and characterisation of Aspergillus species. Mycoses 2011; 55:416-25. [PMID: 22151280 DOI: 10.1111/j.1439-0507.2011.02161.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An early diagnosis of an invasive fungal infection is essential for the initiation of a specific antifungal therapy and to avoid unnecessary discontinuation of a baseline therapy for haematological or oncological diseases. A real-time PCR assay for the detection and strain identification of Aspergillus species from culture strains was evaluated. DNA preparation was evaluated in contaminated culture media, urine and serum. A LightCycler PCR to differentiate various Aspergillus species was established. A real-time PCR assay for the detection of Aspergillus species was improved and was able to detect and differentiate medically important Aspergillus spp. The sensitivity of the test was <10 plasmid equivalents/assay. The real-time PCR assay is a useful tool for the rapid identification of Aspergillus species and might be useful as an early diagnostic tool to detect an invasive fungal infection. A real-time PCR protocol was improved by generating plasmid standards, additional generation of melting curves for species identification and the correlation between the melting temperature and the nucleotide exchanges within the used 18S rRNA gene region.
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Affiliation(s)
- Stephan Fricke
- Fraunhofer Institute for Cell Therapy and Immunology (IZI), Leipzig, Germany.
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31
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Blumchen K, Bayer P, Buck D, Michael T, Cremer R, Fricke C, Henne T, Peters H, Hofmann U, Keil T, Schlaud M, Wahn U, Niggemann B. Effects of latex avoidance on latex sensitization, atopy and allergic diseases in patients with spina bifida. Allergy 2010; 65:1585-93. [PMID: 20659078 DOI: 10.1111/j.1398-9995.2010.02447.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [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: 12/01/2022]
Abstract
BACKGROUND Ten years ago, avoidance measures such as the performance of latex-free operations were implemented in children with spina bifida. Since then, latex sensitization and latex allergy have decreased in this high-risk group. OBJECTIVE To study the effect of primary latex-free prophylaxis on the prevalence of allergic diseases and atopy as a marker for sensitization spreading in children with spina bifida. METHODS One hundred and twenty children with spina bifida born after the introduction of latex-free prophylaxis and operated on under latex-free conditions ('current group') were examined for latex sensitization, latex allergy, sensitization to aero- and food allergens and allergic diseases. Results were compared to a 'historic' (not latex-free operated) group of children with spina bifida and comparable age (n = 87) and to a recent sample of children from the general population (n = 12,403). RESULTS In comparison with the 'historic group', latex sensitization (55% vs 5%, P < 0.001) and latex allergy (37% vs 0.8%, P < 0.001) were significantly reduced in the 'current group'. Furthermore, a significant reduction could be demonstrated for sensitization to aeroallergens (41.4% vs 20.8%, P = 0.001) and for allergic diseases (35% vs 15%, P = 0.001). The prevalence for atopy, sensitization to aero-/foodallergens and for allergic diseases in children of the 'current group' was similar to those in children of the weighted population sample. CONCLUSIONS Latex avoidance in children with spina bifida prevents latex sensitization and latex allergy. Additionally, it also seems to prevent sensitization to other allergens and allergic diseases which might be explained by the prevention of sensitization spreading.
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Affiliation(s)
- K Blumchen
- Department of Pediatric Pneumology and Immunology, Charité University Medicine, Berlin, Germany.
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32
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Fricke S, Fricke C, Schimmelpfennig C, Oelkrug C, Schönfelder U, Blatz R, Zilch C, Faber S, Hilger N, Ruhnke M, Rodloff AC. A real-time PCR assay for the differentiation of Candida species. J Appl Microbiol 2010; 109:1150-8. [PMID: 20456528 DOI: 10.1111/j.1365-2672.2010.04736.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
AIMS We established a real-time PCR assay for the detection and strain identification of Candida species and demonstrated the ability to differentiate between Candida albicans the most common species, and also Candida parapsilosis, Candida glabrata, Candida tropicalis and Candida dubliniensis by LightCycler PCR and melting curve analysis. METHODS AND RESULTS The DNA isolation from cultures and serum was established using the QIAmp Tissue Kit. The sensitivity of the assay was ≥ 2 genome equivalents/assay. It was possible to differentiate all investigated Candida species by melting curve analysis, and no cross-reaction to human DNA or Aspergillus species could be observed. CONCLUSIONS The established real-time PCR assay is a useful tool for the rapid identification of Candida species and a base technology for more complex PCR assays. SIGNIFICANCE AND IMPACT OF THE STUDY We carried out initial steps in validation of a PCR assay for the detection and differentiation of medically relevant Candida species. The PCR was improved by generating PCR standards, additional generation of melting curves for species identification and the possibility to investigate different specimens simultaneously.
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Affiliation(s)
- S Fricke
- Fraunhofer Institute for Cell Therapy and Immunology (IZI), Leipzig, Germany.
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Abstract
Speciation is thought to often result from indirect selection for reproductive isolation. This will occur when reproductive traits that cause reproductive isolation evolve (i) as a by-product of natural selection on traits with which they are genetically correlated or (ii) as an indirect result of diversifying sexual selection. Here, we use experimental evolution to study the degree of divergent evolution of reproductive traits by manipulating the intensity of natural and sexual selection in replicated selection lines of seed beetles. Following 40 generations of selection, we assayed the degree of divergent evolution of reproductive traits between replicate selection lines experiencing the same selection regime. The evolution of reproductive traits was significantly divergent across selection lines within treatments. The evolution of reproductive traits was both slower and, more importantly, significantly less divergent among lines experiencing stronger directional natural selection. This suggests that reproductive traits did not evolve as an indirect by-product of adaptation. We discuss several ways in which natural selection may hamper divergent evolution among allopatric populations.
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Affiliation(s)
- C Fricke
- Evolutionary Biology Centre, Department of Ecology and Evolution, Animal Ecology, Uppsala University, Norbyvägen 18D, Uppsala, Sweden.
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34
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Fricke S, Fricke C, Oelkrug C, Hilger N, Schönfelder U, Kamprad M, Lehmann J, Boltze J, Emmrich F, Sack U. Characterization of murine non-adherent bone marrow cells leading to recovery of endogenous hematopoiesis. Cell Mol Life Sci 2010; 67:4095-106. [DOI: 10.1007/s00018-010-0427-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2010] [Revised: 05/04/2010] [Accepted: 06/01/2010] [Indexed: 12/15/2022]
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Fricke C, Bretman A, Chapman T. Female nutritional status determines the magnitude and sign of responses to a male ejaculate signal in Drosophila melanogaster. J Evol Biol 2009; 23:157-65. [PMID: 19888937 DOI: 10.1111/j.1420-9101.2009.01882.x] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Ejaculate chemicals transferred from males to females during mating cause significant changes in female behaviour and physiology, but the causes of phenotypic variation in these responses is little understood. We tested here the effect of adult female nutrition on the response of female Drosophila melanogaster to a specific ejaculate component, the sex peptide (SP), which is of interest because of its effects on female egg laying, sexual receptivity, feeding rate, immune responses and potential role in mediating sexual conflict. We exposed adult females to five different diets and kept them continuously with males that did or did not transfer SP. Diet altered the presence, magnitude and sign of the effects of SP on different phenotypic traits (egg laying, receptivity and lifespan) and different traits responded in different ways. This showed that the set of responses to mating can be uncoupled and can vary independently in different environments. Importantly, diet also significantly affected whether exposure to SP transferring males was beneficial or costly to females, with beneficial effects occurring more often than expected. Hence, the food environment can also shape significantly the strength and direction of selection on mating responses.
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Affiliation(s)
- C Fricke
- School of Biological Sciences, University of East Anglia, Norwich, UK
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36
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Flindt C, Fricke C, Hohls F, Novotny T, Netocny K, Brandes T, Haug RJ. Universal oscillations in counting statistics. Proc Natl Acad Sci U S A 2009; 106:10116-9. [PMID: 19515823 PMCID: PMC2700917 DOI: 10.1073/pnas.0901002106] [Citation(s) in RCA: 197] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2009] [Indexed: 11/18/2022] Open
Abstract
Noise is a result of stochastic processes that originate from quantum or classical sources. Higher-order cumulants of the probability distribution underlying the stochastic events are believed to contain details that characterize the correlations within a given noise source and its interaction with the environment, but they are often difficult to measure. Here we report measurements of the transient cumulants n(m) of the number n of passed charges to very high orders (up to m = 15) for electron transport through a quantum dot. For large m, the cumulants display striking oscillations as functions of measurement time with magnitudes that grow factorially with m. Using mathematical properties of high-order derivatives in the complex plane we show that the oscillations of the cumulants in fact constitute a universal phenomenon, appearing as functions of almost any parameter, including time in the transient regime. These ubiquitous oscillations and the factorial growth are system-independent and our theory provides a unified interpretation of previous theoretical studies of high-order cumulants as well as our new experimental data.
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Affiliation(s)
- C Flindt
- Department of Physics, Harvard University, Cambridge, MA 02138, USA.
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Abstract
The accessory gland protein (Acp) ejaculate molecules of male Drosophila melanogaster mediate sexual selection and sexual conflict at the molecular level. However, to date no studies have comprehensively measured the timing and magnitude of fitness benefits to males of transferring specific Acps. This is an important omission because without this information it is not possible to fully understand the strength and form of selection acting on adaptations such as Acps. Here, we measured the fitness benefits to males of ejaculate sex peptide (SP) transfer. SP is of interest because it is a candidate for mediating sexual conflict: its frequent receipt reduces female fitness. In single matings with virgin females SP is known to increase egg laying and decrease receptivity. Hence, we predicted that SP could: (i) boost a male's absolute paternity by increasing offspring production and delaying female remating and/or (ii) boost relative paternity share. We tested these predictions using two different lines of SP-lacking males, in both two-mating and free-mating assay conditions. SP transfer conferred higher absolute, but not relative, male reproductive success. In matings with virgin females, SP transfer increased mating productivity and delayed remating and hence the onset of sperm competition. In already mated females, SP transfer did not elevate absolute progeny production, but did increase intermating intervals and hence the period over which a male could gain paternity. Consistent with this, under free-mating conditions over an extended period, we detected a 'per-mating' fitness benefit for males transferring SP. These benefits are consistent with a role for SP in mediating conflict, with SP acting to maximize short-term fitness benefits for males.
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Affiliation(s)
- C Fricke
- School of Biological Sciences, University of East Anglia, Norwich, UK.
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Bayer P, Blümchen K, Michael T, Cremer R, Fricke C, Henne T, Peters H, Hofmann U, Niggemann B, Lafargue B, Schweikardt T, Decker H, Lippert U, Zachmann K, Ferrari D, Neumann C, Soruri A, Gerstenberg M, Dahten A, Koch C, Fokuhl V, Luger E, Worm M, Windhorst V, Eben R, Przybilla B, Bußmann C, Hagemann T, Hanfland J, Haidl G, Bieber T, Novak N, Mlynek A, Weller K, Magerl M, Siebenhaar F, Altrichter S, Vieira dos Santos R, Boodstein N, Zalewska-Janowska A, Maurer M, Berking C, Siebenhaar G, Krieger A, Krieg T, Hartmann K, Hunzelmann N, Eberlein B, Gulyas A, Schultz K, Lecheler J, Gass S, Kroiss M, Huss-Marp J, Behrendt H, Ring J. Poster. Allergo J 2007. [DOI: 10.1007/bf03370562] [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: 12/01/2022]
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Schrøder M, Mortensen A, Pilegaard K, Fricke C, Lütjohann D. We-P14:470 Effect of short-term exposure to phytostanol - and sterol esters on blood lipids in cholesterol challenged WHHL rabbits. ATHEROSCLEROSIS SUPP 2006. [DOI: 10.1016/s1567-5688(06)81822-2] [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: 11/17/2022]
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Lietz M, Ullrich A, Schulte-Eversum C, Oberhoffner S, Fricke C, Müller HW, Schlosshauer B. Physical and biological performance of a novel block copolymer nerve guide. Biotechnol Bioeng 2005; 93:99-109. [PMID: 16187339 DOI: 10.1002/bit.20688] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [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: 11/07/2022]
Abstract
Although the ability to regenerate is evident in the nervous system, lesioned neurites are unable to cross gaps in neuronal pathways. In order to bridge gaps, guiding cues are essential to direct neurite regrowth. To overcome many of the shortcomings of polymer-based nerve guides, we developed a bioresorbable nerve guide composed of a novel trimethylene carbonate-caprolacton block copolymer (TMC-CL). Pore formation was controlled by using special solvent/precipitation media compositions in combination with the pore forming agent poly ethylene glycol (PEG). NMR spectroscopy, shear force-, compression-, and permeation assays were used for conduit characterization. The polymer conduit has a semipermeable wall with submicron pores to allow free metabolite/drug exchange. In order to investigate the principle of temporally controlled expression of therapeutic proteins in nerve guides, Neuro-2a cells were genetically engineered to express the reporter gene product green fluorescent protein (GFP) under the control of the Tet-On system. When these transduced cells were encapsulated in nerve guides, GFP expression could be induced for days by adding the antibiotic tetracycline derivative doxycycline to the nerve guide environment. Furthermore, encapsulated dorsal root ganglia (DRG) produced long neurites in vitro. In subsequent in vivo experiments, nerve guides filled with Schwann cells (SC) were implanted into lesioned spinal cords of adult rats. Regeneration of spinal cord axons into nerve guides was promoted by co-implanted Schwann cells. The data suggest that the novel TMC-CL nerve guides provide a promising tool for neuroregeneration.
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Affiliation(s)
- M Lietz
- NMI Naturwissenschaftliches und Medizinisches Institut an der Universität Tübingen Markwiesenstr, 55, D-72770 Reutlingen, Germany
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Abstract
By tradition, speciation research has been focused on processes leading to either premating or post-zygotic reproductive isolation. The processes which generate isolation after mating but before zygote formation are less well understood. Here, we study divergence in characters which contribute to post-mating prezygotic isolation, such as egg production and remating rate. We propose that 'replicated' laboratory phylogenies with known histories can be used to yield insights into the processes of divergence. We performed a series of cross-matings between populations within two strains of the bean weevil Callosobruchus maculatus. Each strain has a unique and independent origin and both have been kept in the same set of laboratories during the last few decades. Our results show that divergence has occurred between laboratory populations within strains with regards to the effects that mating has on female reproductive behaviour, showing that the evolution of partial post-mating prezygotic isolation can be rapid. More importantly, the pattern of divergence across populations was distinct in the two strains, suggesting that coevolutionary trajectories are not determined by environmental factors but are to some extent arbitrary. We discuss the limitations of the novel empirical strategy employed here, and conclude that our results lend support to the hypothesis that post-mating sexual selection is capable of rapidly generating post-mating prezygotic isolation.
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Affiliation(s)
- C Fricke
- Department of Animal Ecology, Evolutionary Biology Centre, Uppsala University, Norbyvägen, Uppsala, Sweden.
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Abstract
As growing retinotectal axons navigate from the eye to the tectum, they sense guidance molecules distributed along the optic pathway. Mutations in the zebrafish astray gene severely disrupt retinal axon guidance, causing anterior-posterior pathfinding defects, excessive midline crossing, and defasciculation of the retinal projection. Eye transplantation experiments show that astray function is required in the eye. We identify astray as zebrafish robo2, a member of the Roundabout family of axon guidance receptors. Retinal ganglion cells express robo2 as they extend axons. Thus, robo2 is required for multiple axon guidance decisions during establishment of the vertebrate visual projection.
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Affiliation(s)
- C Fricke
- Department of Neurobiology and Anatomy, University of Utah Medical Center, 50 North Medical Drive, Salt Lake City, UT 84132, USA
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Krombach G, Ganser A, Fricke C, Rohde V, Reinges M, Gilsbach J, Spetzger U. Virtual placement of frontal ventricular catheters using frameless neuronavigation: an "unbloody training" for young neurosurgeons. Minim Invasive Neurosurg 2000; 43:171-5. [PMID: 11270825 DOI: 10.1055/s-2000-11376] [Citation(s) in RCA: 25] [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] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
OBJECTIVE To evaluate virtually the reliability of freehand puncture of the anterior horn of the lateral ventricle and to provide realistic, but unbloody training for young neurosurgeons. METHODS Virtual placement of ventricular catheters was performed repeatedly by neurosurgical doctors and thereafter controlled by neuronavigation. With the help of a frameless stereotactic navigation device they virtually had to hit the anterior horn of the lateral ventricle on the MRI of 29 brains with normal ventricular sizes and 60 pathological ventricles, respectively. The catheter placement was simulated using the pointer of the navigation system (EasyGuide Neuro). The monitor screen was blinded, so that on-line control was impossible. Virtual elongation of the pointer tip was performed on the workstation and the position of the virtual catheter was evaluated on a printout. RESULTS Virtual freehand catheter placement was performed 145 times into the MRIs of the normal brains. In 66 cases (45%) the site of the catheter tip was judged as accurate as shown by the navigation system. No difference concerning the number of correctly placed catheters was observed when comparing more and less experienced doctors. The results in the 60 pathological MRIs of patients differed with respect to the size of the ventricles: in narrow ventricles an accurate placement succeeded in 7 of 22 cases (32%), moderately enlarged ventricles were accurately hit in 15 out of 32 cases (46%) and wide ventricles in 5 of 6 attempts (83%), respectively. CONCLUSION This setup is a simple, practicable tool for neurosurgical education. The virtual freehand placement of ventricular drains controlled by neuronavigation provides an unbloody training of a routine neurosurgical procedure in a realistic setting without the risk of injuring a patient. Neuronavigation systems can serve therefore as a link between learning from observation and handling the real situation.
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Affiliation(s)
- G Krombach
- Department of Neurosurgery, University of Technology (RWTH) Aachen, Germany.
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Geisler R, Rauch GJ, Baier H, van Bebber F, Bross L, Dekens MP, Finger K, Fricke C, Gates MA, Geiger H, Geiger-Rudolph S, Gilmour D, Glaser S, Gnügge L, Habeck H, Hingst K, Holley S, Keenan J, Kirn A, Knaut H, Lashkari D, Maderspacher F, Martyn U, Neuhauss S, Neumann C, Nicolson T, Pelegri F, Ray R, Rick JM, Roehl H, Roeser T, Schauerte HE, Schier AF, Schönberger U, Schönthaler HB, Schulte-Merker S, Seydler C, Talbot WS, Weiler C, Nüsslein-Volhard C, Haffter P. A radiation hybrid map of the zebrafish genome. Nat Genet 1999; 23:86-9. [PMID: 10471505 DOI: 10.1038/12692] [Citation(s) in RCA: 220] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Recent large-scale mutagenesis screens have made the zebrafish the first vertebrate organism to allow a forward genetic approach to the discovery of developmental control genes. Mutations can be cloned positionally, or placed on a simple sequence length polymorphism (SSLP) map to match them with mapped candidate genes and expressed sequence tags (ESTs). To facilitate the mapping of candidate genes and to increase the density of markers available for positional cloning, we have created a radiation hybrid (RH) map of the zebrafish genome. This technique is based on somatic cell hybrid lines produced by fusion of lethally irradiated cells of the species of interest with a rodent cell line. Random fragments of the donor chromosomes are integrated into recipient chromosomes or retained as separate minichromosomes. The radiation-induced breakpoints can be used for mapping in a manner analogous to genetic mapping, but at higher resolution and without a need for polymorphism. Genome-wide maps exist for the human, based on three RH panels of different resolutions, as well as for the dog, rat and mouse. For our map of the zebrafish genome, we used an existing RH panel and 1,451 sequence tagged site (STS) markers, including SSLPs, cloned candidate genes and ESTs. Of these, 1,275 (87.9%) have significant linkage to at least one other marker. The fraction of ESTs with significant linkage, which can be used as an estimate of map coverage, is 81.9%. We found the average marker retention frequency to be 18.4%. One cR3000 is equivalent to 61 kb, resulting in a potential resolution of approximately 350 kb.
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Affiliation(s)
- R Geisler
- Max-Planck-Institut für Entwicklungsbiologie, Spemannstr. 35, 72076 Tübingen, Germany.
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Fricke C, Hardt IH, Konig WA, Joulain D, Zygadlo JA, Guzman CA. Sesquiterpenes from lippia integrifolia essential Oil. J Nat Prod 1999; 62:694-696. [PMID: 10346947 DOI: 10.1021/np980424v] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Four sesquiterpenes (1-4) with the africanane skeleton [of which only 5-africanene (1) has been previously reported] and the new asteriscane derivative asterisca-3(15),6-diene (5) were isolated from the essential oil of Lippia integrifolia. A further new compound, african-2(6)-ene (7), was obtained as a semisynthetic product by derivatization of isoafricanol (6). The structures of the new compounds were assigned on the basis of spectroscopic data, enantioselective gas chromatography, and by chemical correlations.
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Affiliation(s)
- C Fricke
- Institut fur Organische Chemie, Universitat Hamburg, D-20146 Hamburg, Germany, Robertet S.A., F-06130 Grasse, France, and Facultad de Ciencias Exactas, Universidad Nacional de Cordoba, 5000 Cordoba, Argentina
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Schauerte HE, van Eeden FJ, Fricke C, Odenthal J, Strähle U, Haffter P. Sonic hedgehog is not required for the induction of medial floor plate cells in the zebrafish. Development 1998; 125:2983-93. [PMID: 9655820 DOI: 10.1242/dev.125.15.2983] [Citation(s) in RCA: 253] [Impact Index Per Article: 9.7] [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: 11/20/2022]
Abstract
Sonic hedgehog (Shh) is a secreted protein that is involved in the organization and patterning of several tissues in vertebrates. We show that the zebrafish sonic-you (syu) gene, a member of a group of five genes required for somite patterning, is encoding Shh. Embryos mutant for a deletion of syu display defects in patterning of the somites, the lateral floor plate cells, the pectoral fins, the axons of motorneurons and the retinal ganglion cells. In contrast to mouse embryos lacking Shh activity, syu mutant embryos do form medial floor plate cells and motorneurons. Since ectopic overexpression of shh in zebrafish embryos does not induce ectopic medial floor plate cells, we conclude that shh is neither required nor sufficient to induce this cell type in the zebrafish.
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Affiliation(s)
- H E Schauerte
- Max-Planck-Institut für Entwicklungsbiologie, Spemannstrasse 35/III, Germany
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Rebagliati MR, Toyama R, Fricke C, Haffter P, Dawid IB. Zebrafish nodal-related genes are implicated in axial patterning and establishing left-right asymmetry. Dev Biol 1998; 199:261-72. [PMID: 9698446 DOI: 10.1006/dbio.1998.8935] [Citation(s) in RCA: 238] [Impact Index Per Article: 9.2] [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: 11/22/2022]
Abstract
Nodal-related 1 (ndr1) and nodal-related 2 (ndr2) genes in zebrafish encode members of the nodal subgroup of the transforming growth factor-beta superfamily. We report the expression patterns and functional characteristics of these factors, implicating them in the establishment of dorsal-ventral polarity and left-right asymmetry. Ndr1 is expressed maternally, and ndr1 and ndr2 are expressed during blastula stage in the blastoderm margin. During gastrulation, ndr expression subdivides the shield into two domains: a small group of noninvoluting cells, the dorsal forerunner cells, express ndr1, while ndr2 RNA is found in the hypoblast layer of the shield and later in notochord, prechordal plate, and overlying anterior neurectoderm. During somitogenesis, ndr2 is expressed asymmetrically in the lateral plate as are nodal-related genes of other organisms, and in a small domain in the left diencephalon, providing the first observation of asymmetric gene expression in the embryonic forebrain. RNA injections into Xenopus animal caps showed that Ndr1 acts as a mesoderm inducer, whereas Ndr2 is an efficient neural but very inefficient mesoderm inducer. We suggest that Ndr1 has a role in mesoderm induction, while Ndr2 is involved in subsequent specification and patterning of the nervous system and establishment of laterality.
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Affiliation(s)
- M R Rebagliati
- Laboratory of Molecular Genetics, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland 20892, USA
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Reul J, Weis J, Spetzger U, Konert T, Fricke C, Thron A. Long-term angiographic and histopathologic findings in experimental aneurysms of the carotid bifurcation embolized with platinum and tungsten coils. AJNR Am J Neuroradiol 1997; 18:35-42. [PMID: 9010518 PMCID: PMC8337861] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
PURPOSE To evaluate the long-term outcome of endovascular occlusion of arterial aneurysms effected with metal coils. METHODS Microsurgical methods were used to produce carotid bifurcation aneurysms in 20 rabbits and the radiologic and histologic changes were examined. Eight of these aneurysms were occluded with electrically detachable platinum coils (Guglielmi detachable coils [GDCs] and nine were treated with mechanically detachable tungsten coils (mechanical detachable system [MDS]). Three aneurysms remained untreated and served as controls. One animal died of embolic complications 12 hours after endovascular treatment. After observation periods of 3 to 6 months, the remaining animals were examined by intraarterial digital subtraction angiography and subsequent fixation and light and electron microscopy. RESULTS Large open spaces without signs of thrombosis were found between the loops of the coil baskets in 12 aneurysms (six treated with GDCs and six treated with MDS) regardless of the observation period. In very densely packed aneurysms (four cases with complete occlusion as determined by angiographic criteria), the coil surfaces were for the most part covered by thin cell layers; however, complete endothelialization was never seen. In aneurysms with an initial partial occlusion of 70% to 90%, coil compaction and/or recanalization was a consistent finding. A comparison of the radiologic findings with the histologic aspect revealed that the degree of occlusion was often overrated on the radiographs (in eight of 17 cases). In general, the fibrous tissue reaction appeared to be slightly more pronounced in aneurysms occluded with tungsten coils. CONCLUSIONS Platinum and tungsten coils were not always effective in causing endoluminal thrombosis leading to long-term occlusion by organized thrombus.
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Affiliation(s)
- J Reul
- Department of Neuroradiology, University Hospital, Aachen, Germany
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Reul J, Spetzger U, Fricke C, Konert T, Bertalanffy H, Thron A. [Endovascular treatment of cerebral aneurysms with selectively detachable platinum coils]. Dtsch Med Wochenschr 1995; 120:669-75. [PMID: 7768161 DOI: 10.1055/s-2008-1055394] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [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: 01/27/2023]
Abstract
In 14 patients (eight men, six women; mean age 58 [31-72] years) with intracranial aneurysm (basilar artery in nine, anterior branches in five) the aneurysm was occluded by electrically detachable platinum coils, advanced into the aneurysm introduced via a percutaneously introduced catheter system, under local anaesthesia and fluoroscopic control. Ten patients had acute subarachnoid haemorrhage (stage II-IV). In two patients several sessions were required before complete occlusion was achieved. In one patient, with a basilar artery aneurysm, the aneurysmal wall was perforated (angiographically demonstrated contrast-medium extravasation), but this remained clinically asymptomatic. There has been no recurrence or renewed bleeding during a follow-up period of 6-12 months. The method is a highly promising addition to the micro-neurosurgical treatment of such aneurysms. However, as long-term results are still awaited, indications for using the method should be strict and only those patients should be so treated in whom operation would be associated with a high risk or who are inoperable.
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Affiliation(s)
- J Reul
- Abteilung Neuroradiologie, Rheinisch-Westfälischen Technischen Hochschule Aachen
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50
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Tschesche H, Bläser J, Kleine T, Schnierer S, Reinemer P, Bode W, Maasjoshusmann U, Fricke C. Inhibition of matrix metalloproteinases in rheumatoid arthritis and the crystallographic binding mode of a peptide inhibitor. Ann N Y Acad Sci 1994; 732:400-2. [PMID: 7978819 DOI: 10.1111/j.1749-6632.1994.tb24766.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)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- H Tschesche
- Lehrstuhl für Biochemie, Fakultät für Chemie, Universität Bielefeld, Germany
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