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Bharathidasan K, Oti-Nimoh J, Pawar D, Butler W, Horn R, Nugent K. Refractory thrombotic thrombocytopenia purpura following a near-drowning experience in a 19-year-old patient. Am J Med Sci 2023. [DOI: 10.1016/s0002-9629(23)00215-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: 01/28/2023]
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Wollak B, Doronkin D, Espinoza D, Sheppard T, Korup O, Schmidt M, Alizadefanaloo S, Rosowski F, Schroer C, Grunwaldt JD, Horn R. Exploring catalyst dynamics in a fixed bed reactor by correlative operando spatially-resolved structure-activity profiling. J Catal 2022. [DOI: 10.1016/j.jcat.2021.08.029] [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: 10/20/2022]
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Stokes SM, Belknap JK, Engiles JB, Stefanovski D, Bertin FR, Medina-Torres CE, Horn R, van Eps AW. Continuous digital hypothermia prevents lamellar failure in the euglycaemic hyperinsulinaemic clamp model of equine laminitis. Equine Vet J 2019; 51:658-664. [PMID: 30636340 DOI: 10.1111/evj.13072] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Accepted: 01/01/2019] [Indexed: 12/20/2022]
Abstract
BACKGROUND Continuous digital hypothermia can prevent the development and progression of laminitis associated with sepsis but its effects on laminitis due to hyperinsulinaemia are unknown. OBJECTIVES To determine the effects of continuous digital hypothermia on laminitis development in the euglycaemic hyperinsulinaemic clamp model. STUDY DESIGN Randomised, controlled (within subject), blinded, experiment. METHODS Eight clinically normal Standardbred horses underwent laminitis induction using the euglycaemic hyperinsulinaemic clamp model (EHC). At initiation of the EHC, one forelimb was continuously cooled (ICE), with the other maintained at ambient temperature (AMB). Dorsal lamellar sections (proximal, middle, distal) were harvested 48 h after initiation of the EHC and were analysed using histological scoring (0-3) and histomorphometry. Cellular proliferation was quantified by counting epidermal cell nuclei staining positive with an immunohistochemical proliferation marker (TPX2). RESULTS Severe elongation and disruption of SEL with dermo-epidermal separation (score of 3) was observed in all AMB feet at one or more section locations, but was not observed in any ICE sections. Overall 92% of the AMB sections received the most severe histological score (grade 3) and 8% were grade 2, whereas ICE sections were classified as either grade 1 (50%) or grade 2 (50%). Relative to AMB feet, ICE sections were 98% less likely to exhibit grades 2 or 3 (OR: 0.02, 95% CI 0.001, 0.365; P<0.01). Histomorphometry measurements of total and nonkeratinised primary epidermal lamellar length were significantly increased (P<0.01) in AMB limbs compared with ICE. TPX2 positive cell counts were significantly increased (P<0.01) in AMB limbs compared with ICE. MAIN LIMITATIONS Continuous digital hypothermia was initiated before recognition of laminitis and therefore the clinical applicability requires further investigation. CONCLUSIONS Continuous digital hypothermia reduced the severity of laminitis in the EHC model and prevented histological lesions compatible with lamellar structural failure.
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Affiliation(s)
- S M Stokes
- Australian Equine Laminitis Research Unit, School of Veterinary Science, the University of Queensland, Gatton, Queensland, Australia
| | - J K Belknap
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, the Ohio State University, Columbus, Ohio, USA
| | - J B Engiles
- New Bolton Center, Department of Clinical Studies, School of Veterinary Medicine, University of Pennsylvania, Kennett Square, Pennsylvania, USA.,New Bolton Center, Pathobiology, School of Veterinary Medicine, University of Pennsylvania, Kennett Square, Pennsylvania, USA
| | - D Stefanovski
- New Bolton Center, Department of Clinical Studies, School of Veterinary Medicine, University of Pennsylvania, Kennett Square, Pennsylvania, USA
| | - F R Bertin
- Australian Equine Laminitis Research Unit, School of Veterinary Science, the University of Queensland, Gatton, Queensland, Australia
| | - C E Medina-Torres
- Australian Equine Laminitis Research Unit, School of Veterinary Science, the University of Queensland, Gatton, Queensland, Australia
| | - R Horn
- Australian Equine Laminitis Research Unit, School of Veterinary Science, the University of Queensland, Gatton, Queensland, Australia
| | - A W van Eps
- Australian Equine Laminitis Research Unit, School of Veterinary Science, the University of Queensland, Gatton, Queensland, Australia.,New Bolton Center, Department of Clinical Studies, School of Veterinary Medicine, University of Pennsylvania, Kennett Square, Pennsylvania, USA
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Horn R, Bamford NJ, Afonso T, Sutherland M, Buckerfield J, Tan RHH, Secombe CJ, Stewart AJ, Bertin FR. Factors associated with survival, laminitis and insulin dysregulation in horses diagnosed with equine pituitary pars intermedia dysfunction. Equine Vet J 2018; 51:440-445. [DOI: 10.1111/evj.13041] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2018] [Accepted: 11/02/2018] [Indexed: 12/29/2022]
Affiliation(s)
- R. Horn
- School of Veterinary Science The University of Queensland Gatton Queensland Australia
| | - N. J. Bamford
- Faculty of Veterinary and Agricultural Sciences The University of Melbourne Werribee Victoria Australia
| | - T. Afonso
- School of Animal and Veterinary Sciences The University of Adelaide Roseworthy South Australia Australia
| | - M. Sutherland
- Gisborne Veterinary Clinic Gisborne Victoria Australia
| | | | - R. H. H. Tan
- College of Public Health, Medical and Veterinary Sciences James Cook University Townsville Queensland Australia
- Samford Valley Veterinary Hospital Samford Queensland Australia
| | - C. J. Secombe
- School of Veterinary and Life Sciences Murdoch University Perth Western Australia Australia
| | - A. J. Stewart
- School of Veterinary Science The University of Queensland Gatton Queensland Australia
| | - F. R. Bertin
- School of Veterinary Science The University of Queensland Gatton Queensland Australia
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Machado DN, Lopes ES, Albuquerque AH, Horn RV, Bezerra WGA, Siqueira RAS, Lopes IT, Nunes FP, Teixeira RSC, Cardoso WM. Isolation and Antimicrobial Resistance Profiles of Enterobacteria from Nestling Grey-Breasted Parakeets (Pyrrhura Griseipectus). Rev Bras Cienc Avic 2018. [DOI: 10.1590/1806-9061-2017-0551] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
| | - ES Lopes
- Universidade Estadual do Ceará, Brazil
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Horn R, Rieker O, Klemm E, Menzel C, Möller HJ, Biersack HJ, Grünwald F. HMPAO-SPECT bei Demenz vom Alzheimer-Typ und Major Depression mit mnestischen Störungen. Nuklearmedizin 2018. [DOI: 10.1055/s-0038-1629660] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
ZusammenfassungZiel der vorliegenden Untersuchung war es, zu prüfen, ob die HMPAO-SPECT zur Differenzierung zwischen der Demenz vom Alzheimer-Typ (DAT) und der Major Depression (MD) beitragen kann. Es wurden ECT-Befunde von 77 Patienten mit Gedächtnisstörungen beurteilt, davon hatten 48 eine DAT und 29 eine MD. Zunächst wurden die Defekte in der SPECT einer Hirn-Region zugeordnet und der Grad der Ausprägung (-1/-2/-3) bewertet. Anschließend wurden die einzelnen Befunde in eine von 7 Befundkategorien eingeordnet. In einigen dieser 7 Gruppen ergaben sich deutliche Häufungen der Fälle mit DAT bzw. MD. 35% aller DAT-Patienten wiesen bilaterale Defekte mit deutlicher (>-1) parietaler/parietotemporaler Minderperfusion auf, dagegen zeigte kein Patient mit MD dieses Muster. Unilaterale Defekte wiesen 62% der MD-, aber nur 31% der DAT-Patienten auf. Die Untersuchung zeigt, daß nur 35% der Patienten mit DAT das bislang als »pathognomonisch« bezeichnete Befundmuster aufwiesen. Dieses Perfusionsmuster kann aber - wenn es vorliegt - als sicheres Kriterium zur Abgrenzung gegen eine MD gewertet werden. Darüber hinaus lassen sich keine eindeutigen (»krankheitstypischen«) Perfusionsmuster erkennen, wenngleich unilaterale Defekte mehr auf eine MD hindeuten.
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Rogger M, Agnoletti M, Alaoui A, Bathurst JC, Bodner G, Borga M, Chaplot V, Gallart F, Glatzel G, Hall J, Holden J, Holko L, Horn R, Kiss A, Kohnová S, Leitinger G, Lennartz B, Parajka J, Perdigão R, Peth S, Plavcová L, Quinton JN, Robinson M, Salinas JL, Santoro A, Szolgay J, Tron S, van den Akker JJH, Viglione A, Blöschl G. Land use change impacts on floods at the catchment scale: Challenges and opportunities for future research. Water Resour Res 2017; 53:5209-5219. [PMID: 28919651 PMCID: PMC5575485 DOI: 10.1002/2017wr020723] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2017] [Accepted: 05/31/2017] [Indexed: 05/06/2023]
Abstract
Research gaps in understanding flood changes at the catchment scale caused by changes in forest management, agricultural practices, artificial drainage, and terracing are identified. Potential strategies in addressing these gaps are proposed, such as complex systems approaches to link processes across time scales, long-term experiments on physical-chemical-biological process interactions, and a focus on connectivity and patterns across spatial scales. It is suggested that these strategies will stimulate new research that coherently addresses the issues across hydrology, soil and agricultural sciences, forest engineering, forest ecology, and geomorphology.
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Affiliation(s)
- M. Rogger
- Institute of Hydraulic Engineering and Water Resources ManagementVienna University of TechnologyViennaAustria
| | - M. Agnoletti
- Laboratory for Landscape and Cultural Heritage (CultLab), Department of Agricultural, Food and Forestry Systems (GESAAF)University of FlorenceFlorenceItaly
| | | | - J. C. Bathurst
- School of Civil Engineering and GeosciencesNewcastle UniversityNewcastle upon TyneUK
| | - G. Bodner
- Division of Agronomy, Department of Crop SciencesUniversity of Natural Resources and Life SciencesTullnAustria
| | - M. Borga
- Department of Land, Environment, Agriculture and ForestryUniversity of PadovaPaduaItaly
| | - V. Chaplot
- Laboratoire d'Océanographie et du Climat (LOCEAN, UMR 7159 CNRS/IRD/UPMC/MNHN)ParisFrance
| | | | - G. Glatzel
- Professor Emeritus, Institute of Forest EcologyUniversity of Natural Resources and Life SciencesViennaAustria
| | - J. Hall
- Institute of Hydraulic Engineering and Water Resources ManagementVienna University of TechnologyViennaAustria
| | - J. Holden
- water@leeds, School of GeographyUniversity of LeedsLeedsUK
| | - L. Holko
- Institute of Hydrology, Slovak Academy of SciencesBratislavaSlovakia
| | - R. Horn
- Institute of Plant Nutrition and Soil Science, Christian Albrechts Universität zu KielKielGermany
| | - A. Kiss
- Institute of Hydraulic Engineering and Water Resources ManagementVienna University of TechnologyViennaAustria
| | - S. Kohnová
- Department of Land and Water Resources Management, Faculty of Civil EngineeringSlovak University of Technology in BratislavaBratislavaSlovakia
| | - G. Leitinger
- Institute of Ecology, University of InnsbruckInnsbruckAustria
| | - B. Lennartz
- Faculty of Agricultural and Environmental SciencesRostock UniversityRostockGermany
| | - J. Parajka
- Institute of Hydraulic Engineering and Water Resources ManagementVienna University of TechnologyViennaAustria
| | - R. Perdigão
- Institute of Hydraulic Engineering and Water Resources ManagementVienna University of TechnologyViennaAustria
| | - S. Peth
- Department of Soil ScienceUniversity of KasselKasselGermany
| | - L. Plavcová
- Faculty of ScienceUniversity of Hradec KrálovéHradec KrálovéCzech Republic
| | - J. N. Quinton
- Lancaster Environment Centre, Lancaster UniversityLancasterUK
| | - M. Robinson
- Centre for Ecology and HydrologyWallingfordUK
| | - J. L. Salinas
- Institute of Hydraulic Engineering and Water Resources ManagementVienna University of TechnologyViennaAustria
| | - A. Santoro
- Laboratory for Landscape and Cultural Heritage (CultLab), Department of Agricultural, Food and Forestry Systems (GESAAF)University of FlorenceFlorenceItaly
| | - J. Szolgay
- Department of Land and Water Resources Management, Faculty of Civil EngineeringSlovak University of Technology in BratislavaBratislavaSlovakia
| | - S. Tron
- Computational Science Center, University of ViennaViennaAustria
| | - J. J. H. van den Akker
- Wageningen Environmental Research, Wageningen University and ResearchWageningenNetherlands
| | - A. Viglione
- Institute of Hydraulic Engineering and Water Resources ManagementVienna University of TechnologyViennaAustria
| | - G. Blöschl
- Institute of Hydraulic Engineering and Water Resources ManagementVienna University of TechnologyViennaAustria
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Horn R, Wingen LU, Snape JW, Dolan L. Mapping of quantitative trait loci for root hair length in wheat identifies loci that co-locate with loci for yield components. J Exp Bot 2016; 67:4535-43. [PMID: 27315832 PMCID: PMC4973729 DOI: 10.1093/jxb/erw228] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Root hairs are fast growing, ephemeral tubular extensions of the root epidermis. They arise in the unsuberized maturation zone of the root, effectively increasing the root surface area in the region over which nutrient and water uptake occur. Variation in root hair length (RHL) between varieties has been shown to be genetically determined, and could, therefore, have consequences for nutrient capture and yield potential in crops. We describe the development of a medium-to-high throughput screening method for assessing RHL in wheat at the seedling stage. This method was used to screen a number of wheat mapping population parental lines for variation in RHL. Parents of two populations derived from inter-varietal crosses differed for RHL: Spark vs Rialto and Charger vs Badger. We identified quantitative trait loci (QTLs) for RHL in the populations derived from these crosses. In Spark × Rialto, QTLs on chromosomes 1A, 2A and 6A were associated with variation in RHL, whilst in Charger × Badger, a QTL for RHL was identified on 2BL. The QTLs on 2A and 6A co-localized with previously described QTLs for yield components. Longer root hairs may confer an advantage by exploiting limiting mineral and water resources. This first QTL analysis of root hair length in wheat identifies loci that could usefully be further investigated for their role in tolerance to limiting conditions.
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Affiliation(s)
- R Horn
- Department of Crop Genetics, The John Innes Centre, Norwich NR4 7UH, UK
| | - L U Wingen
- Department of Crop Genetics, The John Innes Centre, Norwich NR4 7UH, UK
| | - J W Snape
- Department of Crop Genetics, The John Innes Centre, Norwich NR4 7UH, UK
| | - L Dolan
- Department of Crop Genetics, The John Innes Centre, Norwich NR4 7UH, UK Department of Plant Sciences, University of Oxford, South Parks Road, Oxford OX1 3RB, UK
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Silva RCRE, Cardoso WM, Teixeira RSC, Horn RV, Cavalcanti CM, Almeida CP, Sampaio FP, Albuquerque AH, Lopes ES, Gomes Filho VJR, Bezerra WGA, Vasconcelos Filho FSL, Freitas ML. Recovery of Salmonella Gallinarum in the Organs of Experimentally-Inoculated Japanese Quails (Coturnix coturnix). Rev Bras Cienc Avic 2015. [DOI: 10.1590/1516-635x1703281-286] [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] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
| | | | | | - RV Horn
- State University of Ceara, Brazil
| | | | | | | | | | - ES Lopes
- State University of Ceara, Brazil
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Santos ICL, Teixeira RSC, Lopes ES, Albuquerque AH, Rocha e Silva RC, Salles RPR, Machado DN, Horn RV, Bezerra WGA, Buxade CC, Maciel WC. Experimental infection of Salmonella Enteritidis in quails submitted to forced molting by feed fasting. Rev Bras Cienc Avic 2015. [DOI: 10.1590/1516-635x170131-36] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Stemmler M, Petermann F, Daseking M, Siebert J, Schott H, Lehfeld H, Horn R. [The assessment and course of development of cognitive abilities in the elderly]. Gesundheitswesen 2013; 75:761-7. [PMID: 24163218 DOI: 10.1055/s-0033-1357164] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
BACKGROUND The assessment of the appropriate level of development in children belongs to the standard duties of physicians in the public health system. Due to a steady increase of dementia in Germany the assessment of cognitive abilities of the elderly is becoming more and more the focus of future activities. Such an assessment of cognitive functioning reveals whether the respective person is aging normally or whether the impaired cognitive functioning is probably based on a pathological process. OBJECTIVE The aim of the present study is to present cognitive changes in the aged and 2 psychometric tests for the assessment of cognitive functioning: the Wechsler Adult Intelligence Scale (WAIS-IV) and the Short Cognitive Performance Test (SKT), a test for the assessment of memory impairments and impairment of attention. In addition, similarities and dissimilarities are presented. METHODS As part of a multi-centre study in German-speaking countries the data of 504 cognitively healthy persons between the age of 60 and 90 were tested with the WAIS-IV and the SKT. RESULTS AND CONCLUSION The results revealed a significant cognitive decline in the fluid and crystal intelligence depending on age. Only 2 subtests of the WAIS-IV (General Information and Block Design) showed no significant variation due to age. The SKT scores of memory and attention correlated significantly with almost all subtests of the WAIS-IV. The highest correlations were between the SKT attention score and the WAIS-IV subtests for processing speed, perceptual reasoning and working memory. The decline in cognitive abilities is mainly due to reduced capacities in speed of information processing and working memory.
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Affiliation(s)
- M Stemmler
- Institut für Psychologie der Universität Erlangen-Nürnberg
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Albuquerque ÁH, Cardoso WM, Teixeira RSC, Lopes ES, Sales RJPF, Horn RV, Rocha-e-Silva RC, Bezerra WGA, Gomes-Filho VJR. Dissemination of Salmonella enteritidis by experimentally-infected pigeons. Rev Bras Cienc Avic 2013. [DOI: 10.1590/s1516-635x2013000300007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Broadhead AT, Horn R, Lerner DN. Captured streams and springs in combined sewers: a review of the evidence, consequences and opportunities. Water Res 2013; 47:4752-4766. [PMID: 23810838 DOI: 10.1016/j.watres.2013.05.020] [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] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2013] [Revised: 05/14/2013] [Accepted: 05/15/2013] [Indexed: 06/02/2023]
Abstract
Captured streams and springs may be flowing in combined sewers, increasing clean baseflow in pipes and wastewater treatment works (WwTWs), reducing pipe capacity and increasing treatment costs. The UK water industry is aware of this in principle, but there has been no explicit discussion of this in the published literature, nor have there been any known attempts to manage it. Instead, the current focus is on the similar intrusion of groundwater infiltration through pipe cracks and joints. We have conducted a thorough review of literature and international case studies to investigate stream and spring capture, finding several examples with convincing evidence that this occurs. We identify three modes of entry: capture by conversion, capture by interception, and direct spring capture. Methods to identify and quantify capture are limited, but the experience in Zurich suggests that it contributed 7-16% of the baseflow reaching WwTWs. There are negative impacts for the water industry in capital and operational expenditure, as well as environmental and social impacts of loss of urban streams. For a typical WwTW (Esholt, Bradford) with 16% of baseflow from captured streams and springs, we conservatively estimate annual costs of £ 2 million to £ 7 million. A detailed case study from Zurich is considered that has successfully separated captured baseflow into daylighted streams through the urban area, with multiple economic, environmental and social benefits. We conclude that there is a strong case for the UK water industry to consider captured streams and springs, quantify them, and assess the merits of managing them.
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Affiliation(s)
- A T Broadhead
- Catchment Science Centre, Kroto Research Institute, University of Sheffield, Broad Lane, Sheffield S3 7HQ, UK.
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Bernal-Mañas CM, Cortes S, Morales E, Horn R, Seco-Rovira V, Beltran-Frutos E, Ferrer C, Canteras M, Pastor LM. Influence of histological degree of seminiferous tubular degeneration and stage of seminiferous cycle on the proliferation of spermatogonia in aged Syrian hamster (Mesocricetus auratus). Andrologia 2013; 46:672-9. [PMID: 23869747 DOI: 10.1111/and.12134] [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] [Accepted: 05/27/2013] [Indexed: 11/27/2022] Open
Abstract
The ageing testis is associated with germ loss in the seminiferous epithelium and a decrease in spermatogonia proliferation. In this work, we study whether the stages of the seminiferous epithelium cycle and/or the degree of histological tubular degeneration resulting from ageing is related with this decrease in spermatogonia proliferation. Eleven hamsters were used, five aged 6 months and six aged 24 months. In both groups, the proliferative activity was studied by BrdU immunostaining. The number of BrdU-positive and BrdU-negative cells was measured, providing the overall proliferation index in adult and aged testes. The mean number of BrdU-positive cells was also determined for each degree of histological degeneration of seminiferous epithelium, and a spermatogonia proliferation index was obtained for each stage of the seminiferous cycle. Ageing caused an overall decrease in the BrdU-positive cell percentage and a decrease in the number of BrdU-positive cells in the tubular sections with hypospermatogenesis, the sloughing of germ cells and maturation arrest, these changes being similar in both young and old animals. The spermatogonia proliferation index was only seen to be significantly lower in ageing hamster in stages VII-VIII of the seminiferous epithelium cycle. In conclusion, the overall decrease in proliferation observed in aged seminiferous epithelium is correlated with an increase in the number of degenerated sections of the seminiferous tubules, and this decrease is a phenomenon which occurs in specific stages of the seminiferous cycle.
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Affiliation(s)
- C M Bernal-Mañas
- Department of Cell Biology and Histology, Aging Institute, IMIB, School of Medicine, Regional Campus of International Excellence 'Campus Mare Nostrum', University of Murcia, Murcia, Spain
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Teixeira RSC, Cardoso WM, Lopes ES, Rocha-e-Silva RC, Albuquerque AH, Horn RV, Salles RPR. Bacteriological investigation of microorganisms (Salmonella sp. and other Enterobacteriaceae) in common quails (Coturnix coturnix) submitted to different forced-molting procedures. Rev Bras Cienc Avic 2013. [DOI: 10.1590/s1516-635x2013000100008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Rocha-e-Silva RC, Cardoso WM, Teixeira RSC, Albuquerque ÁH, Horn RV, Cavalcanti CM, Lopes ES, Gomes Filho VJR. Salmonella Gallinarum virulence in experimentally-infected Japanese quails (Coturnix japonica). Rev Bras Cienc Avic 2013. [DOI: 10.1590/s1516-635x2013000100007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Baumgarten W, Fleige H, Peth S, Horn R. (Bio-)remediation of VCHC contaminants in a Technosol under unsaturated conditions. Biodegradation 2012; 24:455-69. [PMID: 23160773 DOI: 10.1007/s10532-012-9601-6] [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: 06/18/2012] [Accepted: 10/25/2012] [Indexed: 12/01/2022]
Abstract
The remediation of dense non-aqueous phase liquids has always been a concern of both public and scientific interest groups. In this research work a modified physical concept of (bio)remediation of a volatile chlorinated hydrocarbon (VCHC) contamination was elaborated under laboratory conditions and modeled with HYDRUS-2D. In field dechlorination is influenced by both physicochemical and hydraulic properties of the substrate, e.g. texture, pore size distribution, pore liquid characteristics, e.g. viscosity, pH, surface tension, and dependent on the degree of saturation of the vadose zone. Undisturbed soil cores (100 cm³) were sampled from a Spolic Technosol. Considering hydraulic properties and functions, unsaturated percolation was performed with vertically and horizontally structured samples. VCHC concentrations were calculated prior, during, and after each percolation cycle. According to laboratory findings, microemulsion showed the most efficient results with regard to flow behavior in the unsaturated porous media and its accessibility for bacteria as nutrient. The efficiency of VCHC remediation could be increased by the application of a modified pump-and-treat system: the injection of bacteria Dehalococcoides ethanogenes with microemulsion, and extraction at a constant matric potential level of -6 kPa. Achieved data was used for HYDRUS-2D simulations, modeling in situ conditions, demonstrating the practical relevance (field scale) of performed unsaturated percolation (core scale), and in order to exclude capillary barrier effects.
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Affiliation(s)
- W Baumgarten
- Institute for Plant Nutrition and Soil Science, Christian-Albrechts-University zu Kiel, Hermann-Rodewald-Strasse 2, Kiel, Germany.
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Fulda S, Mikkat S, Stegmann H, Horn R. Physiology and proteomics of drought stress acclimation in sunflower (Helianthus annuus L.). Plant Biol (Stuttg) 2011; 13:632-642. [PMID: 21668604 DOI: 10.1111/j.1438-8677.2010.00426] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
An easy and manageable in vitro screening system for drought tolerance of sunflower seedlings based on MS media supplemented with polyethylene glycol 6000 was evaluated. Morphological and physiological parameters were compared between control (-0.05 MPa) and drought-stressed (-0.6 MPa) seedlings of Helianthus annuus L. cv. Peredovick. There was a significant growth deficit in drought-stressed plants compared to control plants in terms of hypocotyl length, and shoot and root fresh mass. Shoot growth was more restricted than root growth, resulting in an increased root/shoot ratio of drought-stressed plants. Accumulation of osmolytes such as inositol (65-fold), glucose (58-fold), proline (55-fold), fructose (11-fold) and sucrose (eightfold), in leaves of drought-stressed plants could be demonstrated by gas-liquid chromatography. Soluble protein patterns of leaves were analysed with two-dimensional gel electrophoresis (2D-PAGE) and MALDI-TOF mass spectrometry. A set of 46 protein spots allowed identification of 19 marker proteins. Quantitative changes in protein expression of drought-stressed versus control plants were detected. In leaves of drought-stressed sunflower seedlings six proteins were significantly up-regulated more than twofold: a putative caffeoyl-CoA 3-O-methyltransferase (4.5-fold), a fructokinase 3 (3.3-fold), a vegetative storage protein (2.5-fold), a glycine-rich RNA binding protein (2.2-fold), a CuZn-superoxide dismutase (2.1-fold) and an unknown low molecular weight protein (2.3-fold). These proteins represent general stress proteins induced under drought conditions or proteins contributing to basic carbon metabolism. The up-regulated proteins are interesting candidates for further physiological and molecular investigations regarding drought tolerance in sunflower.
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Affiliation(s)
- S Fulda
- Institut für Biowissenschaften, Pflanzengenetik, Universität Rostock, Albert-Einstein-Strasse 3, Rostock, Germany
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Abstract
An easy and manageable in vitro screening system for drought tolerance of sunflower seedlings based on MS media supplemented with polyethylene glycol 6000 was evaluated. Morphological and physiological parameters were compared between control (-0.05 MPa) and drought-stressed (-0.6 MPa) seedlings of Helianthus annuus L. cv. Peredovick. There was a significant growth deficit in drought-stressed plants compared to control plants in terms of hypocotyl length, and shoot and root fresh mass. Shoot growth was more restricted than root growth, resulting in an increased root/shoot ratio of drought-stressed plants. Accumulation of osmolytes such as inositol (65-fold), glucose (58-fold), proline (55-fold), fructose (11-fold) and sucrose (eightfold), in leaves of drought-stressed plants could be demonstrated by gas-liquid chromatography. Soluble protein patterns of leaves were analysed with two-dimensional gel electrophoresis (2D-PAGE) and MALDI-TOF mass spectrometry. A set of 46 protein spots allowed identification of 19 marker proteins. Quantitative changes in protein expression of drought-stressed versus control plants were detected. In leaves of drought-stressed sunflower seedlings six proteins were significantly up-regulated more than twofold: a putative caffeoyl-CoA 3-O-methyltransferase (4.5-fold), a fructokinase 3 (3.3-fold), a vegetative storage protein (2.5-fold), a glycine-rich RNA binding protein (2.2-fold), a CuZn-superoxide dismutase (2.1-fold) and an unknown low molecular weight protein (2.3-fold). These proteins represent general stress proteins induced under drought conditions or proteins contributing to basic carbon metabolism. The up-regulated proteins are interesting candidates for further physiological and molecular investigations regarding drought tolerance in sunflower.
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Affiliation(s)
- S Fulda
- Institut für Biowissenschaften, Pflanzengenetik, Universität Rostock, Albert-Einstein-Strasse 3, Rostock, Germany
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Nogare DD, Degenstein N, Horn R, Canu P, Schmidt L. Modeling spatially resolved data of methane catalytic partial oxidation on Rh foam catalyst at different inlet compositions and flowrates. J Catal 2011. [DOI: 10.1016/j.jcat.2010.10.020] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [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
The estimation of the number of channels in a patch was assumed to be equivalent to the estimation of the binomial parameter n. Seven estimators were evaluated, using data sets simulated for a range of parameters appropriate for single channel recording experiments. No single estimator was best for all parameters; a combination of estimators is a possible option to avoid the biases of individual estimators. All estimators were highly accurate in estimating n in the case that n = 1. For n </= 4 the simplest estimator, the maximum number of simultaneously open channels, was the best, For larger values of n the best estimators were Bayesian.
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Affiliation(s)
- R Horn
- Neurosciences Department, Roche Institute of Molecular Biology, Nutley, New Jersey 07110 USA
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Horn R, Korup O, Geske M, Zavyalova U, Oprea I, Schlögl R. Reactor for in situ measurements of spatially resolved kinetic data in heterogeneous catalysis. Rev Sci Instrum 2010; 81:064102. [PMID: 20590252 DOI: 10.1063/1.3428727] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The present work describes a reactor that allows in situ measurements of spatially resolved kinetic data in heterogeneous catalysis. The reactor design allows measurements up to temperatures of 1300 degrees C and 45 bar pressure, i.e., conditions of industrial relevance. The reactor involves reactants flowing through a solid catalyst bed containing a sampling capillary with a side sampling orifice through which a small fraction of the reacting fluid (gas or liquid) is transferred into an analytical device (e.g., mass spectrometer, gas chromatograph, high pressure liquid chromatograph) for quantitative analysis. The sampling capillary can be moved with microm resolution in or against flow direction to measure species profiles through the catalyst bed. Rotation of the sampling capillary allows averaging over several scan lines. The position of the sampling orifice is such that the capillary channel through the catalyst bed remains always occupied by the capillary preventing flow disturbance and fluid bypassing. The second function of the sampling capillary is to provide a well which can accommodate temperature probes such as a thermocouple or a pyrometer fiber. If a thermocouple is inserted in the sampling capillary and aligned with the sampling orifice fluid temperature profiles can be measured. A pyrometer fiber can be used to measure the temperature profile of the solid catalyst bed. Spatial profile measurements are demonstrated for methane oxidation on Pt and methane oxidative coupling on Li/MgO, both catalysts supported on reticulated alpha-Al(2)O(3) foam supports.
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Affiliation(s)
- R Horn
- Department of Inorganic Chemistry, Fritz Haber Institute of the MPG, Faradayweg 4-6, Berlin 14195, Germany
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Horn R. Le débat sur l'euthanasie et ses répercussions sur les pratiques médicales en fin de vie. Un regard comparatif : France ? Allemagne. ACTA ACUST UNITED AC 2010. [DOI: 10.3917/pos.414.0323] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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Macke C, Prenzler NK, Horn R, Brabant G, Nave H. Ghrelin treatment increases receptor-bound leptin in healthy and endotoxemic obese Lewis rats. Exp Clin Endocrinol Diabetes 2009; 117:473-9. [PMID: 19876793 DOI: 10.1055/s-0029-1220769] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Obese patients with sepsis have higher morbidity and mortality rates than normal weight subjects. One crucial factor is the disease-associated disturbed energy balance. Ghrelin is an orexigenic peptide, mainly produced in the stomach. Leptin is an adipose-tissue derived peptide, circulating as free (fl) and receptor-bound protein (bl) acting antagonistically to ghrelin's effects on food intake. In the present study we tested the weight dependent influence of an intravenous (i.v.) ghrelin injection on leptin levels as well as hepatic protein expression in healthy and endotoxemic rats. Male Lewis rats were randomly divided into four diet-induced obese and four normal weight groups. Application of either ghrelin or NaCl was followed by a bolus injection of LPS or NaCl. Blood was collected at five time points (up to 24 h) to measure fl and bl by radioimmunoassay. Furthermore, hepatic leptin, leptin receptor and ghrelin expression were investigated immunohistochemically. Results revealed a late shift from high elevated fl to significantly enhanced levels of bl in ghrelin treated obese animals. Both fl and bl levels remained unaffected in lean rats. The findings suggest that an increased body weight of the treated animals is associated with altered hormone levels after therapeutic interventions with ghrelin.
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Affiliation(s)
- C Macke
- Institute for Functional and Applied Anatomy, Hannover Medical School, Hannover 30625, Germany
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Buchenauer T, Behrendt P, Bode FJ, Horn R, Brabant G, Stephan M, Nave H. Diet-induced obesity alters behavior as well as serum levels of corticosterone in F344 rats. Physiol Behav 2009; 98:563-9. [PMID: 19751751 DOI: 10.1016/j.physbeh.2009.09.003] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2009] [Revised: 08/28/2009] [Accepted: 09/03/2009] [Indexed: 10/20/2022]
Abstract
Obesity is an increasing socio-economic health problem. Diet-induced obese (DIO) rodents are widely used as a model of obesity in humans. However, there is no comprehensive data about the behavioral phenotype of DIO rodents. Therefore, the aim of the present study was to determine whether a high-fat-diet changes behavioral patterns of DIO Fischer 344 (F344) rats in comparison with lean littermates. The behavioral tests (homecage, holeboard, social interaction, and hotplate) were performed in 28 normal-weight and 28 male DIO F344 rats (mean age: 16 weeks) and revealed a significantly higher level of anxiety- and aggression-related parameters in obese rats, whereas their pain threshold was significantly lower. Fitting to a different behavioral response, basal corticosterone levels (measured by RIA) of obese animals were significantly elevated (16.0ng/ml vs. 12.5ng/ml; p<0.01). We conclude that obese rats differ in various aspects from their lean littermates. The altered behavioral characteristics displayed by DIO F344 rats have to be considered in further experiments involving DIO rodents.
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Affiliation(s)
- T Buchenauer
- Institute for Functional and Applied Anatomy, Hannover Medical School, 30625 Hannover, Germany
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Hoang-Vu C, Dralle H, Scheumann G, Maenhaut C, Horn R, von zur Mühlen A, Brabant G. Gene expression of differentiation- and dedifferentiation markers in normal and malignant human thyroid tissues. Exp Clin Endocrinol 2009; 100:51-6. [PMID: 1281780 DOI: 10.1055/s-0029-1211176] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Steady state mRNA transcript levels of thyroid differentiation markers such as TSH receptor (TSHR), thyroglobulin (Tg) and thyroid peroxidase (TPO) as well as a potential marker of dedifferentiation, c-myc, marker were investigated in patients with thyroid tumors and in normal controls using Northern blot analysis. Blots were normalized by acridine orange staining whereas analysis of beta-actin mRNA levels revealed highly variable levels already in normal tissue suggesting regulation of this "constitutively" expressed gene. Determination of c-myc mRNA revealed increased steady state mRNA levels in anaplastic carcinomas (ATC) as compared to normal tissues. However, in some patients c-myc transcript levels were lower in the tumor than in the adjacent normal tissue reducing the significance of c-myc as a marker of dedifferentiation. High levels of TSH mRNA were found in control thyroids, whereas in ATC no normal TSHR mRNA was detected. In PTC and follicular thyroid carcinomas (FTC) the transcripts varied from increased to markedly reduced levels. In one patient with FTC 2 independent preparations of the tumor revealed different results, undetectable and clearly detectable TSHR mRNA levels. Xenotransplantation of this tissue on nude rats showed a variable expression pattern in the individual xenotransplantations suggesting heterogeneity of the tumor tissue. Tg and TPO mRNA were strongly expressed in normal tissues and completely lost in all ATC. In differentiated thyroid tumors the transcript levels of Tg and TPO varied from normal to complete loss of expression of either Tg or TPO, or both.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- C Hoang-Vu
- Department of Clinical Endocrinology, Medical School of Hannover, Germany
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Horn R. Zur Beeinflussung der konzentrativen Fähigkeiten durch Stutgeron forte*. Vergleichend-experimentelle Doppel-Blind-Studie. Pharmacopsychiatry 2009. [DOI: 10.1055/s-0028-1094354] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Kümpers P, David S, Haubitz M, Hellpap J, Horn R, Bröcker V, Schiffer M, Haller H, Witte T. The Tie2 receptor antagonist angiopoietin 2 facilitates vascular inflammation in systemic lupus erythematosus. Ann Rheum Dis 2008; 68:1638-43. [PMID: 18930996 DOI: 10.1136/ard.2008.094664] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
OBJECTIVE To investigate the role of the angiopoietin-tyrosine kinase with Ig-like and epidermal growth factor-like domains (Ang-Tie) system in systemic lupus erythematosus (SLE). Endothelial activation is emerging as a key event for leukocyte recruitment and accelerated atherosclerosis in SLE. Recently, the endothelial-specific Ang-Tie ligand-receptor system has been identified as a major regulator of vascular responsiveness to inflammatory stimuli. METHODS Ang1 (by immunoradiometric sandwich assay (IRMA)) and Ang2 (by ELISA) were measured in sera of 43 patients with SLE and 30 healthy controls. Expression of Ang2 was studied by immunohistochemistry in biopsies of human lupus nephritis. RESULTS Circulating Ang2 concentrations were increased and concentrations of Ang1 decreased in patients with active SLE compared to healthy controls. This tendency was still present in inactive SLE, although less pronounced. Individual Ang2 concentrations correlated well with SLE Disease Activity Index (SLEDAI) score, proteinuria, double-stranded DNA (dsDNA) titre and soluble vascular cell adhesion molecule 1 (sVCAM-1). In a multivariate regression analysis, renal involvement was the only independent predictor for elevated Ang2. Serum Ang2 was identified as a strong predictor for disease activity by receiver operating characteristic (ROC) procedures and regression tree models. Protein expression of Ang2 was upregulated in glomeruli of patients with lupus nephritis. CONCLUSIONS These data indicate that Ang2-mediated disruption of protective Ang1/Tie2 signalling is operational in SLE. Ang2 might facilitate endothelial inflammation, permeability and contribute to premature atherosclerosis. Furthermore, circulating Ang2 may be a valuable new biomarker for disease activity in SLE. Strategies to control the deleterious effects of Ang2 may open new perspectives to prevent endothelial inflammation in SLE.
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Affiliation(s)
- P Kümpers
- Department of Nephrology, Hanover Medical School, Carl Neuberg Strasse 1, 30625 Hanover, Germany.
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Kumpers P, Horn R, Brabant G, Woywodt A, Schiffer M, Haller H, Haubitz M. Serum leptin and ghrelin correlate with disease activity in ANCA-associated vasculitis. Rheumatology (Oxford) 2007; 47:484-7. [DOI: 10.1093/rheumatology/ken023] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Pearce R, Lam N, Horn R, Ingesson C, Francis R, Vayakis G, Vine G, Worth L. ITER relevant outgassing and leakage from different types of in-vessel cabling. Fusion Engineering and Design 2007. [DOI: 10.1016/j.fusengdes.2007.07.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Kümpers P, Haubitz M, Horn R, Mengel M, Haller H, Brabant G. Circulating levels of ghrelin and leptin in ANCA-associated vasculitis. Exp Clin Endocrinol Diabetes 2007. [DOI: 10.1055/s-2007-972526] [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: 10/21/2022]
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Horn R, Williams K, Degenstein N, Schmidt L. Mechanism of H2 and CO formation in the catalytic partial oxidation of CH4 on Rh probed by steady-state spatial profiles and spatially resolved transients. Chem Eng Sci 2007. [DOI: 10.1016/j.ces.2006.11.030] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [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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Affiliation(s)
- R. Horn
- Lehrstuhl für Bodenkunde, Abteilung Bodenphysik, Universität Bayreuth, Postfach 3008, 8580 Bayreuth
| | - U. Hell
- Lehrstuhl für Bodenkunde, Abteilung Bodenphysik, Universität Bayreuth, Postfach 3008, 8580 Bayreuth
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Horn R, Lorenzl S. Eine zeitgenössische handkopierte Version des neuroanatomischen Lehrbuches „Lecons sur les centres nerveux“ von Joseph Auguste Fort – ein vergessener Lehrer der Neuroanatomie. Akt Neurol 2007. [DOI: 10.1055/s-2007-987961] [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: 10/21/2022]
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Papaefthymiou GC, Viescas AJ, Horn R, Carney E, Zhao G, Chasteen ND, Lee J, Gorun SM. Deuterium isotope effects on iron core formation in ferritin. ACTA ACUST UNITED AC 2006. [DOI: 10.1007/s10751-006-9280-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [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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Bouysse P, Horn R, Le Lann F. Etude de la structure de la plate-forme continentale méridionale de la mer Celtique entre 7 et 8 degrés ouest. ACTA ACUST UNITED AC 2006. [DOI: 10.2516/ogst:1975031] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Luis R, Hernandez P, Celdran F, Horn R. Epidemiology of out-of-hospital cardiac arrest attended by an emergency medical services system. Resuscitation 2006. [DOI: 10.1016/j.resuscitation.2006.06.079] [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: 11/30/2022]
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Dubois-Fernandez P, Cantalloube H, Vaizan B, Krieger G, Horn R, Wendler M, Giroux V. ONERA-DLR bistatic SAR campaign: planning, data acquisition, and first analysis of bistatic scattering behaviour of natural and urban targets. ACTA ACUST UNITED AC 2006. [DOI: 10.1049/ip-rsn:20045117] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Morales E, Pastor LM, Horn R, Zuasti A, Ferrer C, Calvo A, Santamaría L, Canteras M. Effect of ageing on the proliferation and apoptosis of testicular germ cells in the Syrian hamster Mesocricetus auratus. Reprod Fertil Dev 2005; 15:89-98. [PMID: 12895405 DOI: 10.1071/rd02071] [Citation(s) in RCA: 10] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2002] [Accepted: 02/01/2003] [Indexed: 11/23/2022] Open
Abstract
The cellular mechanisms implicated in the atrophy of seminiferous epithelium in ageing are currently under debate, although recent reports suggest that apoptosis may be the primary mechanism implicated in aged germ cell loss. Other investigators have suggested that changes in spermatogonial proliferation are also involved. In the present work, the changes in proliferation and apoptosis in the seminiferous epithelium of aged (24 months) Syrian hamsters were examined in concert and compared with those in young (6 months) animals. Proliferation of germ cells was studied by bromodeoxyuridine labelling and apoptosis was assessed by transmission electron microscopy and in situ TUNEL labelling. Aged animals showed a significant decrease in the numbers of total and proliferating spermatogonia plus preleptotene spermatocytes per unit volume and per testis and in the proliferative index (24.8 +/- 1.6%) compared with young animals (30.8 +/- 1.2%) (P < 0.05). The number of apoptotic spermatogonia plus spermatocytes per unit volume and the apoptotic index were significantly higher in aged animals (1.51 +/- 0.23% v. 0.77 +/- 0.04%; P < 0.05). Apoptosis was confirmed by morphological characteristics: condensation of the chromatin and nuclear fragmentation. In aged hamsters, tubular degeneration could be classified into several categories, showing an increase of apoptotic cells in tubular cross-sections characterized by maturation arrest in comparison with all other types. Spermatogonial proliferation was also diminished as seen in tubular cross-sections showing hypospermatogenesis, sloughing off of germ cells and maturation arrest. The results obtained in the present study suggest that the decrease in the proliferation of spermatogonia and the increase in apoptosis constitute two consecutive mechanisms correlated with the ageing of the seminiferous epithelium.
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Affiliation(s)
- E Morales
- Department of Cell Biology, School of Medicine, University of Murcia, 30100 Murcia, Spain
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Abstract
BACKGROUND Leptin is primarily secreted by the adipose tissue. It binds not only to hypothalamic structures involved in energy regulation but also to many peripheral tissues including the liver. Leptin circulates in free and receptor-bound forms. Both components are differentially regulated under various pathophysiological conditions and serve different physiological functions. They are released from adipose tissue but previous data suggest an additional formation outside the fat compartment. Here we tested the contribution of the liver in binding and modulating leptin in the circulation. MATERIALS AND METHODS In vivo experiments were performed with radioactive labelled leptin with and without pretreatment with unlabelled leptin in freely moving, chronic intravenously cannulated male rats. Livers were investigated by immunohistochemistry and in situ hybridization and immunoblotting was performed, followed by ex vivo liver perfusion studies with human recombinant leptin. RESULTS In in vivo experiments radioactively labelled leptin (at low concentrations) is avidly bound to rat liver (greater than 80% of basal serum values 90 min following i.v. infusion). Pre-treatment with excess of unlabelled leptin in vivo revealed a rapid hepatic down-regulation of leptin receptor isoforms when tested by in situ hybridization, immunoblotting or immunohistochemistry. Ex vivo perfusion of rat liver with human recombinant leptin induced a dose- and time-dependent formation of receptor-bound leptin in the perfusate. CONCLUSIONS The present data support an active role of the liver in the modulation of the leptin signal through different regulation of the soluble leptin receptor, the bound and free forms of the hormone, which may have important implications for leptin's central efficacy and the development of 'leptin resistance'.
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Affiliation(s)
- G Brabant
- Department of Gastroenterology, Hepatology and Endocrinology, Hannover Medical School, Hannover, Germany.
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Morales E, Horn R, Pastor LM, Santamaría L, Pallarés J, Zuasti A, Ferrer C, Canteras M. Involution of seminiferous tubules in aged hamsters: an ultrastructural, immunohistochemical and quantitative morphological study. Histol Histopathol 2004; 19:445-55. [PMID: 15024705 DOI: 10.14670/hh-19.445] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In this study, we examined the age-related changes on morphometric parameters and ultrastructure of seminiferous tubules, and on the expression of extracellular matrix proteins in lamina propria of Syrian hamsters. A significant decrease in the percentage of normal tubules and an increase in the percentage of hypospermatogenic and arrested maturation tubules was observed with aging. Aged animals showed a decrease in tubular diameter, tubular lumen, seminiferous epithelium volume and total tubular volume. However, the total length of seminiferous tubules was significantly increased with aging. The most important ultrastructural changes with aging were the thickening of the lamina propria, the presence of diverse abnormalities in the spermiogenesis process, degeneration of germ cells, and vacuolization and flattening of Sertoli cells showing abundant lipofucsin droplets and residual bodies. Laminin immunoreactivity was found along the lamina propria of seminiferous tubules both in young and aged animals. Fibronectin immunoreactivity was found along the lamina propria and blood vessels. Both laminin and fibronectin total volume of immunostaining per testis was increased in aged hamsters. In conclusion, the age-related changes in seminiferous tubules of hamster include: a decrease in tubular width and an increase in tubular length; widening of the lamina propria caused by a more extensive connective matrix between the peritubular cells and the basal membrane; and a strong disarrangement of the seminiferous epithelium, including germ cell degeneration and important alterations in both spermiogenesis and Sertoli cell structure.
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Affiliation(s)
- E Morales
- Department of Cellular Biology, Medical School, University of Murcia, Spain
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Horn R, Mestl G, Thiede M, Jentoft FC, Schmidt PM, Bewersdorf M, Weber R, Schlögl R. Gas phase contributions to the catalytic formation of HCN from CH4and NH3over Pt: An in situ study by molecular beam mass spectrometry with threshold ionization. Phys Chem Chem Phys 2004. [DOI: 10.1039/b407897g] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Abstract
The cultivated peanut (Arachis hypogaea L.) is an allotetraploid composed of A and B genomes. The phylogenetic relationship among the cultivated peanut, wild diploid, and tetraploid species in the section Arachis was studied based on sequence comparison of stearoyl-ACP desaturase and oleoyl-PC desaturase. The topology of the trees for both fatty acid desaturases displayed two clusters; one cluster with A genome diploid species and the other with B genome diploid species. The two homeologous genes obtained for each of the two fatty acid desaturases from the tetraploid species A. hypogaea and A. monticola were separated into the A and B genome clusters, respectively. The gene phylogenetic trees showed that A. hypogaea is more closely related to the diploid species A. duranensis and A. ipaensis than to the wild tetraploid species A. monticola, suggesting that A. monticola is not a progenitor of the cultivated peanut. In addition, for the stearoyl-ACP desaturase, the A. duranensis sequence was identical with one of the sequences of A. hypogaea and the A. ipaensis sequence was identical with the other. These results support the hypothesis that A. duranensis and A. ipaensis are the most likely diploid progenitors of the cultivated tetraploid A. hypogaea.
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Affiliation(s)
- S Jung
- Department of Genetics and Biochemistry, Clemson University, 100 Jordan Hall, Clemson, SC 29634-0324, USA
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Horn R, Kusterer B, Lazarescu E, Prüfe M, Friedt W. Molecular mapping of the Rf1 gene restoring pollen fertility in PET1-based F1 hybrids in sunflower (Helianthus annuus L.). Theor Appl Genet 2003; 106:599-606. [PMID: 12595987 DOI: 10.1007/s00122-002-1078-y] [Citation(s) in RCA: 24] [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] [Received: 05/17/2002] [Accepted: 06/19/2002] [Indexed: 05/20/2023]
Abstract
Up to now a single cytoplasmic male sterility (CMS) source, PET1, is used worldwide for hybrid breeding in sunflower. Introgression of the restorer gene Rf1, responsible for fertility restoration, into new breeding material requires tightly linked markers to perform an efficient marker-assisted selection. A survey of 520 decamer primers by bulked segregant analyses identified five RAPD markers linked to the restorer gene Rf1. In a F(2) population of 183 individuals one of the RAPD markers, OPK13_454, mapped 0.8 cM from Rf1, followed by OPY10_740 with 2 cM. Bulked segregant analyses using 48 AFLP primer combinations identified 17 polymorphisms, which could be mapped in the same linkage group as Rf1. E33M61_136, and E41M48_113 were mapped 0.3 cM and 1.6 cM from the gene, respectively. Conversion of E41M48_113 into a sequence-specific marker resulted in a monomorphic pattern. However, two of the RAPD markers, OPK13_454 and OPY10_740, were successfully converted into SCAR markers, HRG01 and HRG02, which are now available for marker-assisted selection. To investigate the utility of these SCAR markers in other cross-combinations they were tested in a set of 20 lines. Comparison of the patterns of 11 restorer and nine maintainer lines of PET1 demonstrated that the markers OPK13_454/HRG01 and HRG02 were absent in all maintainer lines but present in all restorer lines, apart from the high oleic line RHA348 and the dwarf line Gio55. In addition, restorer lines developed from the interspecific hybrids Helianthus annuus x Helianthus mollis and H. annuus x Helianthus rigidus gave the same characteristic amplification products.
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Affiliation(s)
- R Horn
- Institut für Pflanzenbau und Pflanzenzüchtung I, Justus-Liebig-Universität Giessen, Heinrich-Buff-Ring 26-32, Germany.
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Cummins TR, Renganathan M, Stys PK, Herzog RI, Scarfo K, Horn R, Dib-Hajj SD, Waxman SG. The pentapeptide QYNAD does not block voltage-gated sodium channels. Neurology 2003; 60:224-9. [PMID: 12552035 DOI: 10.1212/01.wnl.0000042423.36650.bd] [Citation(s) in RCA: 24] [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] [Indexed: 11/15/2022] Open
Abstract
BACKGROUND An endogenous pentapeptide (Gln-Tyr-Asn-Ala-Asp; QYNAD) that is present at elevated levels in human CSF from patients with demyelinating diseases has been reported to block voltage-gated sodium channels at low (10 micro M) concentrations. Objective : Because of the potential importance of sodium channel blocking activity in demyelinating disorders, this study attempted to determine the sensitivity to QYNAD of different sodium channel subtypes, including Na(v)1.6, the major sodium channel at nodes of Ranvier, and Na(v)1.2, which is expressed in axons with abnormal myelin. METHODS Sodium channel function was assayed using patch-clamp recordings, both in heterologous expression systems and in intact neurons. RESULTS QYNAD synthesized in 10 different batches by four different facilities failed to block sodium currents, even at concentrations as high as 500 micro M (50-fold higher than the blocking concentration originally reported). QYNAD had no effect on the currents produced by recombinant Na(v)1.2, Na(v)1.4, Na(v)1.6, and Na(v)1.7 sodium channels or on the sodium currents that are produced by native channels in adult hippocampal or dorsal root ganglion neurons. QYNAD did not interfere with conduction in the optic nerve, a myelinated fiber tract that is often affected in MS. CONCLUSIONS These experiments do not show any sodium channel blocking effect of QYNAD. The conclusion that QYNAD contributes to the pathophysiology of inflammatory neurologic disorders by blocking voltage-gated sodium channels should therefore be viewed with caution.
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Affiliation(s)
- T R Cummins
- Department of Neurology, PVA/EPVA Neuroscience Research Center, Yale University School of Medicine, New Haven, VA Medical Center, West Haven, CT, USA
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Weber S, Friedt W, Landes N, Molinier J, Himber C, Rousselin P, Hahne G, Horn R. Improved Agrobacterium-mediated transformation of sunflower (Helianthus annuus L.): assessment of macerating enzymes and sonication. Plant Cell Rep 2003; 21:475-482. [PMID: 12789451 DOI: 10.1007/s00299-002-0548-7] [Citation(s) in RCA: 13] [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] [Subscribe] [Scholar Register] [Received: 07/05/2002] [Revised: 10/07/2002] [Accepted: 10/08/2002] [Indexed: 05/24/2023]
Abstract
Agrobacterium -mediated transformation of shoot apices of sunflower (Helianthus annuus L.) was evaluated following wounding by cell-wall-digesting enzymes and sonication. The frequency of explants with regenerated shoots expressing GUS (beta-glucuronidase) or GFP (green fluorescent protein) increased following treatment with the macerating enzymes cellulase Onozuka R-10 and pectinase Boerozym M5, whereas treatment with macerozyme R-10 had a negative effect. When a combination of cellulase (0.1%) and pectinase (0.05%) was used, the rate of explants with uniformly GUS-positive shoots increased at least twofold. The transient expression of reporter genes was also enhanced using sonication (50 MHz; 2, 4 and 6 s), but stable expression in regenerated shoots following 4 weeks of selection did not increase with this treatment. Enzyme treatment alone (0.1% cellulase and 0.05% pectinase) was superior to a combined treatment of sonication and enzymes with respect to stable transformation. Polymerase chain reaction analyses of shoots recovered by grafting from transformation experiments using GFP as the reporter gene demonstrated the stable integration of the transgene. Regenerated plants were fertile and seeds could be harvested.
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Affiliation(s)
- S Weber
- Institut für Pflanzenbau und Pflanzenzüchtung I, LS Pflanzenzüchtung, Justus-Liebig-Universität, Heinrich-Buff-Ring 26-32, 35392 Giessen, Germany
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Danne T, Grüters A, Wladimirova A, Weber B, Horn R, Mayr B, Brabant G. Gender-specific differences of serum leptin in obese and normal-weight adolescents: studies in type-I diabetes and Turner syndrome. Horm Res 2002; 48:103-7. [PMID: 11546926 DOI: 10.1159/000185498] [Citation(s) in RCA: 8] [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: 11/19/2022]
Abstract
The influence of exogenous insulin and estrogen substitution on serum leptin-like immunoreactivity was studied longitudinally in patients with type-I diabetes and Turner syndrome using a specific radioimmunoassay. Prepubertal, pubertal and postpubertal samples of 17 patients (9 girls, 8 boys) with type-I diabetes mellitus developing obesity were compared to those of 17 normal-weight controls matched for gender, age and diabetes duration. Six obese and six normal-weight girls with Turner syndrome were studied without hormone substitution, with ethinylestradiol alone, and with cyclic estradiol/gestagen substitution. The mean leptin levels of the girls with diabetes were two times higher than boys at all times, while insulin doses and glycemic control had no influence. In Turner syndrome estrogen substitution led to increased leptin levels only in the obese group. This study revealed that both body weight above normal and female sex steroids seem to be necessary to elevate leptin concentrations, while exogenous insulin has no effect.
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Affiliation(s)
- T Danne
- Abteilung für Allgemeine Pädiatrie, Kliniken für Kinderheilkunde und Kinderchirurgie, Charité-Virchow-Klinikum, Berlin, Deutschland.
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Abstract
The organisation of mtDNA was investigated for 28 sources of cytoplasmic male sterility (CMS) and a fertile line (normal cytoplasm) of Helianthus annuus by Southern hybridisation. In addition to nine known mitochondrial genes ( atp6, atp9, cob, coxI, coxII, coxIII, 18S, 5S and nd5) three probes for the open reading frames in the rearranged area of PET1, orfH522, orfH708 and orfH873, were used. Genetic similarities of the investigat-ed cytoplasms varied between 0.3 and 1. Cluster analyses using the UPGMA method allowed the distinction of ten mitochondrial (mt) types between the 29 investigated cytoplasms. Most mitochondrial types comprise two or more CMS sources, which could not be further separated, like the PET1-like CMS sources (with the exception of ANO1 and PRR1), or ANN1/ANN2/ANN3, ANN4/ ANN5, ARG3/RIG1, BOL1/EXI1/PEF1/PEP1 and GIG1/ PET2. ANL1, ANL2 and the fertile cytoplasms are also regarded as one mitochondrial type. Unique banding patterns were only observed for ANT1 ( atp6), MAX1 ( atp6, orfH522 and orfH708) and PRR1 ( coxII). However, four of the mitochondrial types showed unique hybridisation signals: ANN4/ANN5 had characteristic bands for atp6 and orfH708, PEF1/PEP1/EXI1/BOL1 for atp6and coxII, and PET2/GIG1 for atp9. The PET1-like cytoplasms all shared the same patterns for orfH522, orfH708and cob (except ANO1). It could be demonstrated that CMS sources, like, e.g., PET2 and PEF1, are different from PET1 in mtDNA organisation and the CMS mechanism. Therefore, these CMS sources represent interesting candidates for the development of new hybrid breeding systems based on new CMS mechanisms.
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Affiliation(s)
- R. Horn
- Institut für Pflanzenbau und Pflanzenzüchtung I, Justus-Liebig-Universität Giessen, Heinrich-Buff-Ring 26-32, 35392 Giessen, Germany.
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Heilmeier H, Wartinger A, Erhard M, Zimmermann R, Horn R, Schulze ED. Soil drought increases leaf and whole-plant water use of Prunus dulcis grown in the Negev Desert. Oecologia 2002; 130:329-336. [DOI: 10.1007/s004420100808] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2001] [Accepted: 08/21/2001] [Indexed: 11/27/2022]
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Coleman M, Horn R, Goral S. An uncommon disease in a patient with a solitary kidney. Am J Kidney Dis 2001; 38:896-900. [PMID: 11576899 DOI: 10.1053/ajkd.2001.27724] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- M Coleman
- Vanderbilt University Medical Center, Nashville, TN 37232-2372, USA
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