1
|
Steiner FA, Wild AJ, Tyborski N, Tung SY, Koehler T, Buegger F, Carminati A, Eder B, Groth J, Hesse BD, Pausch J, Lüders T, Vahl WK, Wolfrum S, Mueller CW, Vidal A. Rhizosheath drought responsiveness is variety-specific and a key component of belowground plant adaptation. New Phytol 2024; 242:479-492. [PMID: 38418430 DOI: 10.1111/nph.19638] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2023] [Accepted: 02/02/2024] [Indexed: 03/01/2024]
Abstract
Biophysicochemical rhizosheath properties play a vital role in plant drought adaptation. However, their integration into the framework of plant drought response is hampered by incomplete mechanistic understanding of their drought responsiveness and unknown linkage to intraspecific plant-soil drought reactions. Thirty-eight Zea mays varieties were grown under well-watered and drought conditions to assess the drought responsiveness of rhizosheath properties, such as soil aggregation, rhizosheath mass, net-rhizodeposition, and soil organic carbon distribution. Additionally, explanatory traits, including functional plant trait adaptations and changes in soil enzyme activities, were measured. Drought restricted soil structure formation in the rhizosheath and shifted plant-carbon from litter-derived organic matter in macroaggregates to microbially processed compounds in microaggregates. Variety-specific functional trait modifications determined variations in rhizosheath drought responsiveness. Drought responses of the plant-soil system ranged among varieties from maintaining plant-microbial interactions in the rhizosheath through accumulation of rhizodeposits, to preserving rhizosheath soil structure while increasing soil exploration through enhanced root elongation. Drought-induced alterations at the root-soil interface may hold crucial implications for ecosystem resilience in a changing climate. Our findings highlight that rhizosheath soil properties are an intrinsic component of plant drought response, emphasizing the need for a holistic concept of plant-soil systems in future research on plant drought adaptation.
Collapse
Affiliation(s)
- Franziska A Steiner
- Soil Science, TUM School of Life Sciences, Technical University of Munich, 85354, Freising, Germany
| | - Andreas J Wild
- Agroecology, Bayreuth Center of Ecology and Environmental Research (BayCEER), University of Bayreuth, 95447, Bayreuth, Germany
| | - Nicolas Tyborski
- Ecological Microbiology, Bayreuth Center of Ecology and Environmental Research (BayCEER), University of Bayreuth, 95448, Bayreuth, Germany
| | - Shu-Yin Tung
- Soil Science, TUM School of Life Sciences, Technical University of Munich, 85354, Freising, Germany
- Institute for Agroecology and Organic Farming, Bavarian State Research Center for Agriculture, 85354, Freising, Germany
| | - Tina Koehler
- Root-Soil Interaction, TUM School of Life Sciences, Technical University of Munich, 85354, Freising, Germany
| | - Franz Buegger
- Research Unit Environmental Simulation, Helmholtz Zentrum München (GmbH), German Research Center for Environmental Health, 85764, Neuherberg, Germany
| | - Andrea Carminati
- Physics of Soils and Terrestrial Ecosystems, Department of Environmental Systems Science, ETH Zurich, 8092, Zurich, Switzerland
| | - Barbara Eder
- Institute for Crop Science and Plant Breeding, Bavarian State Research Center for Agriculture, 85354, Freising, Germany
| | - Jennifer Groth
- Institute for Crop Science and Plant Breeding, Bavarian State Research Center for Agriculture, 85354, Freising, Germany
| | - Benjamin D Hesse
- Chair of Land Surface-Atmosphere Interactions, TUM School of Life Sciences, Technical University of Munich, 85354, Freising, Germany
- Department of Integrative Biology and Biodiversity Research, Institute of Botany, University of Natural Resources and Life Sciences, 1180, Vienna, Austria
| | - Johanna Pausch
- Agroecology, Bayreuth Center of Ecology and Environmental Research (BayCEER), University of Bayreuth, 95447, Bayreuth, Germany
| | - Tillmann Lüders
- Ecological Microbiology, Bayreuth Center of Ecology and Environmental Research (BayCEER), University of Bayreuth, 95448, Bayreuth, Germany
| | - Wouter K Vahl
- Institute for Crop Science and Plant Breeding, Bavarian State Research Center for Agriculture, 85354, Freising, Germany
| | - Sebastian Wolfrum
- Institute for Agroecology and Organic Farming, Bavarian State Research Center for Agriculture, 85354, Freising, Germany
| | - Carsten W Mueller
- Chair of Soil Science, Institute of Ecology, Technische Universität Berlin, 10587, Berlin, Germany
- Department for Geoscience and Natural Resource Management, University of Copenhagen, 1350, Copenhagen, Denmark
| | - Alix Vidal
- Soil Biology Group, Department of Environmental Sciences, Wageningen University, 6700, Wageningen, the Netherlands
| |
Collapse
|
2
|
Wild AJ, Steiner FA, Kiene M, Tyborski N, Tung SY, Koehler T, Carminati A, Eder B, Groth J, Vahl WK, Wolfrum S, Lueders T, Laforsch C, Mueller CW, Vidal A, Pausch J. Unraveling root and rhizosphere traits in temperate maize landraces and modern cultivars: Implications for soil resource acquisition and drought adaptation. Plant Cell Environ 2024. [PMID: 38515431 DOI: 10.1111/pce.14898] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Revised: 03/07/2024] [Accepted: 03/11/2024] [Indexed: 03/23/2024]
Abstract
A holistic understanding of plant strategies to acquire soil resources is pivotal in achieving sustainable food security. However, we lack knowledge about variety-specific root and rhizosphere traits for resource acquisition, their plasticity and adaptation to drought. We conducted a greenhouse experiment to phenotype root and rhizosphere traits (mean root diameter [Root D], specific root length [SRL], root tissue density, root nitrogen content, specific rhizosheath mass [SRM], arbuscular mycorrhizal fungi [AMF] colonization) of 16 landraces and 22 modern cultivars of temperate maize (Zea mays L.). Our results demonstrate that landraces and modern cultivars diverge in their root and rhizosphere traits. Although landraces follow a 'do-it-yourself' strategy with high SRLs, modern cultivars exhibit an 'outsourcing' strategy with increased mean Root Ds and a tendency towards increased root colonization by AMF. We further identified that SRM indicates an 'outsourcing' strategy. Additionally, landraces were more drought-responsive compared to modern cultivars based on multitrait response indices. We suggest that breeding leads to distinct resource acquisition strategies between temperate maize varieties. Future breeding efforts should increasingly target root and rhizosphere economics, with SRM serving as a valuable proxy for identifying varieties employing an outsourcing resource acquisition strategy.
Collapse
Affiliation(s)
- Andreas J Wild
- Agroecology, Bayreuth Center of Ecology and Environmental Research (BayCEER), University of Bayreuth, Bayreuth, Germany
| | - Franziska A Steiner
- Soil Science, TUM School of Life Sciences, Technical University of Munich, Freising, Germany
| | - Marvin Kiene
- Animal Ecology I, Bayreuth Center of Ecology and Environmental Research (BayCEER), University of Bayreuth, Bayreuth, Germany
| | - Nicolas Tyborski
- Ecological Microbiology, Bayreuth Center of Ecology and Environmental Research (BayCEER), University of Bayreuth, Bayreuth, Germany
| | - Shu-Yin Tung
- Institute for Agroecology and Organic Farming, Bavarian State Research Center for Agriculture, Freising, Germany
- School of Life Sciences, Technical University of Munich, Freising, Germany
| | - Tina Koehler
- Soil Physics, Bayreuth Center of Ecology and Environmental Research (BayCEER), University of Bayreuth, Bayreuth, Germany
- Physics of Soils and Terrestrial Ecosystems, Department of Environmental Systems Science, ETH Zurich, Zurich, Switzerland
| | - Andrea Carminati
- Physics of Soils and Terrestrial Ecosystems, Department of Environmental Systems Science, ETH Zurich, Zurich, Switzerland
| | - Barbara Eder
- Institute for Crop Science and Plant Breeding, Bavarian State Research Center for Agriculture (LfL), Freising, Germany
| | - Jennifer Groth
- Institute for Crop Science and Plant Breeding, Bavarian State Research Center for Agriculture (LfL), Freising, Germany
| | - Wouter K Vahl
- Institute for Crop Science and Plant Breeding, Bavarian State Research Center for Agriculture (LfL), Freising, Germany
| | - Sebastian Wolfrum
- Institute for Agroecology and Organic Farming, Bavarian State Research Center for Agriculture, Freising, Germany
| | - Tillmann Lueders
- Ecological Microbiology, Bayreuth Center of Ecology and Environmental Research (BayCEER), University of Bayreuth, Bayreuth, Germany
| | - Christian Laforsch
- Animal Ecology I, Bayreuth Center of Ecology and Environmental Research (BayCEER), University of Bayreuth, Bayreuth, Germany
| | - Carsten W Mueller
- Chair of Soil Science, Institute of Ecology, Technische Universitaet Berlin, Berlin, Germany
- Department of Geosciences and Natural Resource Management, University of Copenhagen, Copenhagen, Denmark
| | - Alix Vidal
- Soil Biology Group, Wageningen University, Wageningen, The Netherlands
| | - Johanna Pausch
- Agroecology, Bayreuth Center of Ecology and Environmental Research (BayCEER), University of Bayreuth, Bayreuth, Germany
| |
Collapse
|
3
|
Koehler T, Schaum C, Tung SY, Steiner F, Tyborski N, Wild AJ, Akale A, Pausch J, Lueders T, Wolfrum S, Mueller CW, Vidal A, Vahl WK, Groth J, Eder B, Ahmed MA, Carminati A. Above and belowground traits impacting transpiration decline during soil drying in 48 maize (Zea mays) genotypes. Ann Bot 2023; 131:373-386. [PMID: 36479887 PMCID: PMC9992933 DOI: 10.1093/aob/mcac147] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [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] [Received: 11/11/2022] [Revised: 11/24/2022] [Accepted: 12/06/2022] [Indexed: 06/17/2023]
Abstract
BACKGROUND AND AIMS Stomatal regulation allows plants to promptly respond to water stress. However, our understanding of the impact of above and belowground hydraulic traits on stomatal regulation remains incomplete. The objective of this study was to investigate how key plant hydraulic traits impact transpiration of maize during soil drying. We hypothesize that the stomatal response to soil drying is related to a loss in soil hydraulic conductivity at the root-soil interface, which in turn depends on plant hydraulic traits. METHODS We investigate the response of 48 contrasting maize (Zea mays) genotypes to soil drying, utilizing a novel phenotyping facility. In this context, we measure the relationship between leaf water potential, soil water potential, soil water content and transpiration, as well as root, rhizosphere and aboveground plant traits. KEY RESULTS Genotypes differed in their responsiveness to soil drying. The critical soil water potential at which plants started decreasing transpiration was related to a combination of above and belowground traits: genotypes with a higher maximum transpiration and plant hydraulic conductance as well as a smaller root and rhizosphere system closed stomata at less negative soil water potentials. CONCLUSIONS Our results demonstrate the importance of belowground hydraulics for stomatal regulation and hence drought responsiveness during soil drying. Furthermore, this finding supports the hypothesis that stomata start to close when soil hydraulic conductivity drops at the root-soil interface.
Collapse
Affiliation(s)
| | - Carolin Schaum
- Soil Physics, Bayreuth Center of Ecology and Environmental Research (BayCEER), University of Bayreuth, Bayreuth, Germany
| | - Shu-Yin Tung
- Institute for Agroecology and Organic Farming, Bavarian State Research Center for Agriculture, Freising, Germany
| | | | - Nicolas Tyborski
- Ecological Microbiology, Bayreuth Center of Ecology and Environmental Research (BayCEER), University of Bayreuth, Bayreuth, Germany
| | - Andreas J Wild
- Agroecology, Bayreuth Center of Ecology and Environmental Research (BayCEER), University of Bayreuth, Bayreuth, Germany
| | - Asegidew Akale
- Soil Physics, Bayreuth Center of Ecology and Environmental Research (BayCEER), University of Bayreuth, Bayreuth, Germany
| | - Johanna Pausch
- Agroecology, Bayreuth Center of Ecology and Environmental Research (BayCEER), University of Bayreuth, Bayreuth, Germany
| | - Tillmann Lueders
- Ecological Microbiology, Bayreuth Center of Ecology and Environmental Research (BayCEER), University of Bayreuth, Bayreuth, Germany
| | - Sebastian Wolfrum
- Institute for Agroecology and Organic Farming, Bavarian State Research Center for Agriculture, Freising, Germany
| | - Carsten W Mueller
- Soil Science, Technical University of Munich, Freising, Germany
- Department of Geosciences and Natural Resource Management, University of Copenhagen, Copenhagen, Denmark
| | - Alix Vidal
- Soil Biology Group, Wageningen University & Research, Wageningen, The Netherlands
| | - Wouter K Vahl
- Institute for Crop Science and Plant Breeding, Bavarian State Research Center for Agriculture, Freising, Germany
| | - Jennifer Groth
- Institute for Crop Science and Plant Breeding, Bavarian State Research Center for Agriculture, Freising, Germany
| | - Barbara Eder
- Institute for Crop Science and Plant Breeding, Bavarian State Research Center for Agriculture, Freising, Germany
| | - Mutez A Ahmed
- Soil Physics, Bayreuth Center of Ecology and Environmental Research (BayCEER), University of Bayreuth, Bayreuth, Germany
- Department of Land, Air and Water Resources, University of California Davis, Davis, CA, USA
| | - Andrea Carminati
- Physics of Soils and Terrestrial Ecosystems, Department of Environmental Systems Science, ETH Zurich, Zurich, Switzerland
| |
Collapse
|
4
|
Traugott MT, Pleininger S, Inschlag-Tisch S, Eder B, Seitz T, Merrelaar A, Reiß-Kornfehl J, Fussi J, Schindler S, Blaschitz M, Heger F, Indra A, Karolyi M, Staudacher M, Oelschlaegel T, Hoepler W, Neuhold S, Wenisch C. Correction: A case of fulminant respiratory diphtheria in a 24-year-old Afghan refugee in Austria in May 2022: a case report. Infection 2023; 51:497-498. [PMID: 36639594 PMCID: PMC10042953 DOI: 10.1007/s15010-022-01964-y] [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: 01/15/2023]
Affiliation(s)
- M T Traugott
- IV Medical Department with Infectious Diseases and Tropical Medicine, Clinic Favoriten, Kundratstraße 3, 1100, Vienna, Austria.
| | - S Pleininger
- Austrian Reference Centre for Diphtheria, Austrian Agency for Health and Food Safety, Vienna, Austria
| | - S Inschlag-Tisch
- Department of Internal Medicine, Cardiology and Nephrology, Hospital of Wiener Neustadt, Wiener Neustadt, Austria
| | - B Eder
- IV Medical Department with Infectious Diseases and Tropical Medicine, Clinic Favoriten, Kundratstraße 3, 1100, Vienna, Austria
| | - T Seitz
- IV Medical Department with Infectious Diseases and Tropical Medicine, Clinic Favoriten, Kundratstraße 3, 1100, Vienna, Austria
| | - A Merrelaar
- IV Medical Department with Infectious Diseases and Tropical Medicine, Clinic Favoriten, Kundratstraße 3, 1100, Vienna, Austria
| | - J Reiß-Kornfehl
- Department of Otorhinolaryngology, Hospital of Wiener Neustadt, Wiener Neustadt, Austria
| | - J Fussi
- Department of Internal Medicine, Cardiology and Nephrology, Hospital of Wiener Neustadt, Wiener Neustadt, Austria
| | - S Schindler
- Austrian Reference Centre for Diphtheria, Austrian Agency for Health and Food Safety, Vienna, Austria
| | - M Blaschitz
- Austrian Reference Centre for Diphtheria, Austrian Agency for Health and Food Safety, Vienna, Austria
| | - F Heger
- Austrian Reference Centre for Diphtheria, Austrian Agency for Health and Food Safety, Vienna, Austria
| | - A Indra
- Austrian Reference Centre for Diphtheria, Austrian Agency for Health and Food Safety, Vienna, Austria
| | - M Karolyi
- IV Medical Department with Infectious Diseases and Tropical Medicine, Clinic Favoriten, Kundratstraße 3, 1100, Vienna, Austria
| | - M Staudacher
- IV Medical Department with Infectious Diseases and Tropical Medicine, Clinic Favoriten, Kundratstraße 3, 1100, Vienna, Austria
| | - T Oelschlaegel
- IV Medical Department with Infectious Diseases and Tropical Medicine, Clinic Favoriten, Kundratstraße 3, 1100, Vienna, Austria
| | - W Hoepler
- IV Medical Department with Infectious Diseases and Tropical Medicine, Clinic Favoriten, Kundratstraße 3, 1100, Vienna, Austria
| | - S Neuhold
- IV Medical Department with Infectious Diseases and Tropical Medicine, Clinic Favoriten, Kundratstraße 3, 1100, Vienna, Austria
| | - C Wenisch
- IV Medical Department with Infectious Diseases and Tropical Medicine, Clinic Favoriten, Kundratstraße 3, 1100, Vienna, Austria
| |
Collapse
|
5
|
Traugott MT, Pleininger S, Inschlag-Tisch S, Eder B, Seitz T, Merrelaar A, Reiß-Kornfehl J, Fussi J, Schindler S, Blaschitz M, Heger F, Indra A, Karolyi M, Staudacher M, Oelschlaegel T, Hoepler W, Neuhold S, Wenisch C. A case of fulminant respiratory diphtheria in a 24-year-old Afghan refugee in Austria in May 2022: a case report. Infection 2022; 51:489-495. [PMID: 36178603 PMCID: PMC10042955 DOI: 10.1007/s15010-022-01926-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Accepted: 09/15/2022] [Indexed: 01/15/2023]
Abstract
PURPOSE Raising awareness of respiratory diphtheria and for the importance of early antitoxin administration. METHODS Report of a case of fulminant, imported respiratory diphtheria in an otherwise healthy 24-year-old Afghan refugee in Austria in May 2022. RESULT This was the first case of respiratory diphtheria in Austria since 1993. Diphtheria antitoxin was administered at an already progressed disease stage. This delay contributed to a fulminant disease course with multiorgan failure and death. CONCLUSION In high-income countries with low case numbers, awareness of respiratory diphtheria and for the importance of early antitoxin administration must be raised.
Collapse
Affiliation(s)
- M T Traugott
- IV Medical Department with Infectious Diseases and Tropical Medicine, Clinic Favoriten, Kundratstraße 3, 1100, Vienna, Austria.
| | - S Pleininger
- Austrian Reference Centre for Diphtheria, Austrian Agency for Health and Food Safety, Vienna, Austria
| | - S Inschlag-Tisch
- Department of Internal Medicine, Cardiology and Nephrology, Hospital of Wiener Neustadt, Wiener Neustadt, Austria
| | - B Eder
- IV Medical Department with Infectious Diseases and Tropical Medicine, Clinic Favoriten, Kundratstraße 3, 1100, Vienna, Austria
| | - T Seitz
- IV Medical Department with Infectious Diseases and Tropical Medicine, Clinic Favoriten, Kundratstraße 3, 1100, Vienna, Austria
| | - A Merrelaar
- IV Medical Department with Infectious Diseases and Tropical Medicine, Clinic Favoriten, Kundratstraße 3, 1100, Vienna, Austria
| | - J Reiß-Kornfehl
- Department of Otorhinolaryngology, Hospital of Wiener Neustadt, Wiener Neustadt, Austria
| | - J Fussi
- Department of Internal Medicine, Cardiology and Nephrology, Hospital of Wiener Neustadt, Wiener Neustadt, Austria
| | - S Schindler
- Austrian Reference Centre for Diphtheria, Austrian Agency for Health and Food Safety, Vienna, Austria
| | - M Blaschitz
- Austrian Reference Centre for Diphtheria, Austrian Agency for Health and Food Safety, Vienna, Austria
| | - F Heger
- Austrian Reference Centre for Diphtheria, Austrian Agency for Health and Food Safety, Vienna, Austria
| | - A Indra
- Austrian Reference Centre for Diphtheria, Austrian Agency for Health and Food Safety, Vienna, Austria
| | - M Karolyi
- IV Medical Department with Infectious Diseases and Tropical Medicine, Clinic Favoriten, Kundratstraße 3, 1100, Vienna, Austria
| | - M Staudacher
- IV Medical Department with Infectious Diseases and Tropical Medicine, Clinic Favoriten, Kundratstraße 3, 1100, Vienna, Austria
| | - T Oelschlaegel
- IV Medical Department with Infectious Diseases and Tropical Medicine, Clinic Favoriten, Kundratstraße 3, 1100, Vienna, Austria
| | - W Hoepler
- IV Medical Department with Infectious Diseases and Tropical Medicine, Clinic Favoriten, Kundratstraße 3, 1100, Vienna, Austria
| | - S Neuhold
- IV Medical Department with Infectious Diseases and Tropical Medicine, Clinic Favoriten, Kundratstraße 3, 1100, Vienna, Austria
| | - C Wenisch
- IV Medical Department with Infectious Diseases and Tropical Medicine, Clinic Favoriten, Kundratstraße 3, 1100, Vienna, Austria
| |
Collapse
|
6
|
Kapilashrami A, Otis M, Omodara D, Nandi A, Vats A, Adeniyi O, Speed E, Potter JL, Eder B, Pareek M, Bhui K. Ethnic disparities in health & social care workers’ exposure, protection, and clinical management of the COVID-19 pandemic in the UK. Critical Public Health 2021. [DOI: 10.1080/09581596.2021.1959020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- A. Kapilashrami
- School of Health & Social Care, University of Essex, Colchester, UK
- People’s Health Movement, UK
| | - M. Otis
- NIHR Applied Research Collaboration Northwest London
- Imperial College London Imperial College London
| | - D. Omodara
- Institute of Population Health Sciences, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, UK
| | - A. Nandi
- Institute for Social and Economic Research, University of Essex, Colchester, UK
| | - A. Vats
- Rowley Bristow Unit, Department of Orthopaedics, Ashford and St Peter's Hospitals NHS Foundation Trust
| | - O. Adeniyi
- School of Management, Nottingham Business School, Nottingham Trent University, UK
| | - E. Speed
- School of Health & Social Care, University of Essex, Colchester, UK
| | - J. L. Potter
- North Middlesex University Hospital, Nottingham, UK
| | - B. Eder
- People’s Health Movement, UK
| | - M. Pareek
- Department of Respiratory Sciences, University of Leicester, Leicester, UK
- Department of Infection and HIV Medicine, University Hospitals Leicester NHS Trust, Leicester, UK
| | - K. Bhui
- Department of Psychiatry & Nuffield Department of Primary Care Health Sciences, Medical Sciences Division, University of Oxford, Oxford, UK
| | | |
Collapse
|
7
|
Schweyer SM, Eder B, Putzer P, Mayerbacher M, Lemke N, Schreiber KU, Hugentobler U, Kienberger R. All-in-fiber SESAM based comb oscillator with an intra-cavity electro-optic modulator for coherent high bandwidth stabilization. Opt Express 2018; 26:23798-23807. [PMID: 30184876 DOI: 10.1364/oe.26.023798] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Accepted: 07/21/2018] [Indexed: 06/08/2023]
Abstract
We demonstrate the stabilization of an all-in-fiber polarization maintaining semi-conductor saturable absorber mirror (SESAM) mode locked frequency comb oscillator with an intra-cavity waveguide electro-optic phase modulator (EOM) to a narrow linewidth HeNe laser over 46 hours. The high feedback bandwidth of the EOM allows a coherent optical lock with an in-loop integrated phase noise of 1.12 rad (integrated from 10 Hz to 3 MHz) from the carrier signal. No piezo fiber stretcher was required to guarantee long-term stabilization, preventing mechanical degradation of the optical fibers and enabling a long lifetime of the oscillator. As an application a hybrid stabilization scheme is presented, where a comb tooth is phase locked to a longitudinal mode of the large ring laser "G" located at the Geodatic Observatory Wettzell. The hybrid stabilization scheme describes the optical lock of the frequency comb to the G laser and the simultaneous compensation of the ring laser frequency drift by comparing the comb repetition rate against an active H-maser reference. In this context the ring laser reached a fractional Allan deviation of 5 · 10-16 at an integration time of 16384 s.
Collapse
|
8
|
Baumgartner B, Jaki T, Wolfsegger MJ, Eder B, Schiviz A, Schwarz HP, Muchitsch EM. Optimization, refinement and reduction of murine in vivo experiments to assess therapeutic approaches for haemophilia A. Lab Anim 2010; 44:211-7. [PMID: 20507877 DOI: 10.1258/la.2010.009113] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The tail cut bleeding model (CUT) is routinely used in factor VIII-deficient mice to assess pharmacodynamic effects of therapeutic strategies for haemophilia A. Results from this model are highly variable, many modifications to the model are reported and at times the animals' wellbeing may be compromised by recording survival as an endpoint. We therefore investigated if the ferric chloride carotid occlusion model (COM) used for thrombosis research can be applied to enhance data quality and animal welfare in haemophilia A research. Relative dose effects and relative dose variations were calculated for the CUT and COM. The requisite sample sizes were estimated and the importance of survival rates to assess rebleeds during recovery was evaluated by correlating initial blood loss to mortality. Relative dose effects increased with higher doses in both models. The COM was more sensitive at lower doses than the CUT, had up to 82% less variation across doses and clearly showed superior accuracy. Only 5% of the sample size required for the CUT would be needed to establish non-inferiority between a specific therapeutic dose in haemophilia A mice and healthy wild-type animals. A strong statistically significant correlation was found between initial blood loss and mortality within 24 h. Our findings clearly suggest that the COM is a valid tool for assessing haemophilia A treatment in vivo. The highly reproducible data means that significantly fewer animals are required and a more humane endpoint can be used by directly assessing clot stability instead of survival rate.
Collapse
Affiliation(s)
- B Baumgartner
- Technology Resources, Baxter Healthcare Corporation, Round Lake, IL, USA.
| | | | | | | | | | | | | |
Collapse
|
9
|
Pollard M, Eder B, Fischer P, Windhab E. Characterization of galactomannans isolated from legume endosperms of Caesalpinioideae and Faboideae subfamilies by multidetection aqueous SEC. Carbohydr Polym 2010. [DOI: 10.1016/j.carbpol.2009.07.028] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
10
|
Pollard MA, Kelly R, Fischer PA, Windhab EJ, Eder B, Amadò R. Investigation of molecular weight distribution of LBG galactomannan for flours prepared from individual seeds, mixtures, and commercial samples. Food Hydrocoll 2008. [DOI: 10.1016/j.foodhyd.2007.11.004] [Citation(s) in RCA: 20] [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: 10/22/2022]
|
11
|
Pohlig G, Fendrich G, Knecht R, Eder B, Piechottka G, Sommerhoff CP, Heim J. Purification, characterization and biological evaluation of recombinant leech-derived tryptase inhibitor (rLDTI) expressed at high level in the yeast Saccharomyces cerevisiae. Eur J Biochem 1996; 241:619-26. [PMID: 8917464 DOI: 10.1111/j.1432-1033.1996.00619.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
An efficient expression/purification procedure has been developed which allows the production of pure, biologically active recombinant leech-derived tryptase inhibitor (rLDTI), originally found in the leech Hirudo medicinalis. The gene for LDTI was generated synthetically from three overlapping oligonucleotides by PCR synthesis. LDTI was expressed in the yeast Saccharomyces cerevisiae under the control of the copper-inducible CUP1 promoter and fused to the invertase signal sequence (SUC2). The entire expression cassette was inserted into the yeast high-copy vector pDP34. Appropriate host strains transformed with the expression plasmid secreted rLDTI into the medium upon copper addition. Proteinchemical analysis of the secreted rLDTI revealed exclusively inhibitor with the correct N-terminal sequence. Up to 60% of the rLDTI, however, appeared to be modified by glycosylation and the unglycosylated material showed heterogeneity at the C-terminus. Besides full-length rLDTI, truncated rLDTI species lacking either the terminal Asn46 or in addition the penultimate Leu45 were isolated. The C-terminally truncated variants were eliminated using a S. cerevisiae host strain disrupted in the structural genes of carboxypeptidases yscY and ysca, thus identifying these proteases as being responsible for the degradation of rLDTI. Mature rLDTI was purified in high yields from the culture supernatant of the carboxypeptidase-deficient yeast strain by cation-exchange chromatography and reverse-phase HPLC. The recombinant protein is at least 98% pure, based on HPLC and capillary electrophoresis, and is fully biologically active. Structural identity with the authentic leech protein was confirmed by sequence analysis and molecular-mass determination. The purified protein was tested for its ability to inhibit tryptase and trypsin in vitro and to interfere with the tryptase-induced proliferation of human fibroblasts and keratinocytes. Recombinant LDTI appears to be as potent as the authentic leech protein, exhibiting Ki-values of approximately 1.5 nM and approximately 1.6 nM against human tryptase and bovine trypsin, respectively. The tryptase-induced proliferation of human fibroblasts and keratinocytes was inhibited with half-maximum values of approximately 0.1 nM and approximately 1 nM, respectively. The availability of the recombinant material will allow evaluation of the concept of tryptase inhibition in various disease models and to test the therapeutic potential of LDTI in mast-cell-related disorders.
Collapse
Affiliation(s)
- G Pohlig
- Department of Core Drug Discovery Technologies, Ciba-Geigy Ltd, Basel, Switzerland.
| | | | | | | | | | | | | |
Collapse
|
12
|
Abstract
Portable emergency ventilators are commonly used in the prehospital setting in the transport of critically ill patients in hypobaric environments. The aim of our trial was to evaluate the influence on minute ventilation and blood gas analysis of moderate altitude (3000 m) compared to 171 m in healthy volunteers during mechanical ventilation with the Draeger Oxylog ventilator. At 3000 m, the delivered minute volume increased by 9.8% in the air mix mode and by 14.6% in the no air mix mode. PaO2 at 3000 m altitude decreased by 33.3% in the air mix mode, and no statistical change was observed in the no air mix mode. PaCO2 at 3000 m altitude decreased by 9.0% in the air mix mode and by 12.8% in the no air mix mode. These changes are of sufficient magnitude and importance to require monitoring of minute volume to prevent barotrauma or volume-related trauma and to monitor oxygenation by pulse oximetry during emergency mechanical ventilation at moderate altitude.
Collapse
Affiliation(s)
- M Roeggla
- Department of Emergency Medicine, University of Vienna, Austria
| | | | | | | | | |
Collapse
|
13
|
Bode HP, Eder B, Trautmann M. An investigation on the role of vacuolar-type proton pumps and luminal acidity in calcium sequestration by nonmitochondrial and inositol-1,4,5-trisphosphate-sensitive intracellular calcium stores in clonal insulin-secreting cells. Eur J Biochem 1994; 222:869-77. [PMID: 8026497 DOI: 10.1111/j.1432-1033.1994.tb18934.x] [Citation(s) in RCA: 13] [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: 01/28/2023]
Abstract
To test whether in RINm5F rat insulinoma cells luminal acidity and the activity of a vacuolar-type proton pump are involved in calcium sequestration by intracellular calcium stores sensitive to inositol 1,4,5-trisphosphate (InsP3) we examined the effects of various proton-conducting ionophores and ammonium chloride, and of bafilomycin, a specific inhibitor of vacuolar proton pumps, on this parameter. Bafilomycin in concentrations up to 1 microM did not affect calcium sequestration by nonmitochondrial, InsP3-sensitive stores at all; 50 microM carbonylcyanide m-chlorophenylhydrazone, 50 microM monensin and 30 mM NH4Cl, which are diverse ways to dissipate transmembrane pH gradients, did not inhibit calcium sequestration. This argues against signficant involvement of internal acidity and vacuolar proton pumps in calcium sequestration by InsP3-sensitive stores in RINm5F cells. The proton-potassium-exchanging ionophore nigericin (20-100 microM), however, inhibited calcium sequestration by nonmitochondrial and InsP3-sensitive stores. This effect was dependent on the presence of potassium and could be reversed by inclusion of carbonylcyanide m-chlorophenylhydrazone or acetate in the incubation medium. Thus, the inhibitory effect of nigericin appears to be based on proton extrusion coupled to potassium influx across the membrane of calcium stores in RINm5F cells, creating an internal alkalinization of these stores. The effect of nigericin implies the continuous maintenance of an outside-to-inside potassium concentration gradient by nonmitochondrial calcium stores in RINm5F cells. This feature will be of potential interest in the identification of InsP3-sensitive calcium-storing organelles.
Collapse
Affiliation(s)
- H P Bode
- Institut für Pharmakologie und Toxikologie, Philipps-Universität, Marburg, Germany
| | | | | |
Collapse
|