1
|
Doran PT, Hayes A, Grasset O, Coustenis A, Prieto-Ballesteros O, Hedman N, Al Shehhi O, Ammannito E, Fujimoto M, Groen F, Moores JE, Mustin C, Olsson-Francis K, Peng J, Praveenkumar K, Rettberg P, Sinibaldi S, Ilyin V, Raulin F, Suzuki Y, Xu K, Whyte LG, Zaitsev M, Buffo J, Kminek G, Schmidt B. The COSPAR planetary protection policy for missions to Icy Worlds: A review of history, current scientific knowledge, and future directions. Life Sci Space Res (Amst) 2024; 41:86-99. [PMID: 38670657 DOI: 10.1016/j.lssr.2024.02.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2023] [Revised: 02/03/2024] [Accepted: 02/07/2024] [Indexed: 04/28/2024]
Abstract
Recent discoveries related to the habitability and astrobiological relevance of the outer Solar System have expanded our understanding of where and how life may have originated. As a result, the Icy Worlds of the outer Solar System have become among the highest priority targets for future spacecraft missions dedicated to astrobiology-focused and/or direct life detection objectives. This, in turn, has led to a renewed interest in planetary protection concerns and policies for the exploration of these worlds and has been a topic of discussion within the COSPAR (Committee on Space Research) Panel on Planetary Protection. This paper summarizes the results of those discussions, reviewing the current knowledge and the history of planetary protection considerations for Icy Worlds as well as suggesting ways forward. Based on those discussions, we therefore suggest to (1) Establish a new definition for Icy Worlds for Planetary Protection that captures the outer Solar System moons and dwarf planets like Pluto, but excludes more primitive bodies such as comets, centaurs, and asteroids: Icy Worlds in our Solar System are defined as all bodies with an outermost layer that is believed to be greater than 50 % water ice by volume and have enough mass to assume a nearly round shape. (2) Establish indices for the lower limits of Earth life with regards to water activity (LLAw) and temperature (LLT) and apply them into all areas of the COSPAR Planetary Protection Policy. These values are currently set at 0.5 and -28 °C and were originally established for defining Mars Special Regions; (3) Establish LLT as a parameter to assign categorization for Icy Worlds missions. The suggested categorization will have a 1000-year period of biological exploration, to be applied to all Icy Worlds and not just Europa and Enceladus as is currently the case. (4) Have all missions consider the possibility of impact. Transient thermal anomalies caused by impact would be acceptable so long as there is less than 10-4 probability of a single microbe reaching deeper environments where temperature is >LLT in the period of biological exploration. (5) Restructure or remove Category II* from the policy as it becomes largely redundant with this new approach, (6) Establish that any sample return from an Icy World should be Category V restricted Earth return.
Collapse
Affiliation(s)
- P T Doran
- Department of Geology and Geophysics, Louisiana State, Baton Rouge, LA, USA.
| | - A Hayes
- Cornell University, Ithaca, NY, 14853-6801, USA
| | | | - A Coustenis
- LESIA, Paris Observatory, PSL University, CNRS, Paris University, 92195, Meudon Cedex, France
| | - O Prieto-Ballesteros
- Centro de Astrobiología (CAB), CSIC-INTA, 28850, Torrejón de Ardoz, Madrid, Spain
| | - N Hedman
- Committee, Policy and Legal Affairs Section, Office for Outer Space Affairs, United Nations Office at Vienna, Austria
| | | | | | - M Fujimoto
- Japan Aerospace Exploration Agency (JAXA), Institute of Space and Astronautical Science (ISAS), Kanagawa, Japan
| | - F Groen
- Office of Safety and Mission Assurance, NASA Headquarters, Washington, DC, 20546, USA
| | | | - C Mustin
- Centre National des Etudes Spatiales (CNES), France
| | - K Olsson-Francis
- AstrobiologyOU, Faculty of Science, Technology, Engineering and Mathematics, The Open University, Milton Keynes, UK
| | - J Peng
- China National Space Administration, Beijing, China
| | | | - P Rettberg
- German Aerospace Center (DLR), Institute of Aerospace Medicine, Radiation Biology Department, Research Group Astrobiology, 51147, Cologne, Germany
| | - S Sinibaldi
- European Space Agency, ESA-ESTEC, Noordwijk, the Netherlands
| | - V Ilyin
- Institute for Biomedical Problems, Russian Academy of Sciences, Moscow, Russia
| | - F Raulin
- Univ Paris Est Créteil and Université Paris Cité, CNRS, LISA, F-94010, Créteil, France
| | - Y Suzuki
- Department of Earth and Planetary Science, The University of Tokyo,7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
| | - K Xu
- Laboratory of Space Microbiology, Shenzhou Space Biotechnology Group, Chinese Academy of Space Technology, Beijing, China
| | - L G Whyte
- Department of Natural Resource Sciences, McGill University, Montreal, Canada
| | - M Zaitsev
- Planetary Physics Department, Space Research Inst. of Russian Acad. of Sciences, Moscow, Russia
| | - J Buffo
- Thayer School of Engineering, Dartmouth College, Hanover, NH, USA
| | - G Kminek
- European Space Agency, ESA-ESTEC, Noordwijk, the Netherlands
| | - B Schmidt
- Cornell University, Ithaca, NY, 14853-6801, USA
| |
Collapse
|
2
|
Zorzano MP, Olsson-Francis K, Doran PT, Rettberg P, Coustenis A, Ilyin V, Raulin F, Shehhi OA, Groen F, Grasset O, Nakamura A, Ballesteros OP, Sinibaldi S, Suzuki Y, Kumar P, Kminek G, Hedman N, Fujimoto M, Zaitsev M, Hayes A, Peng J, Ammannito E, Mustin C, Xu K. The COSPAR planetary protection requirements for space missions to Venus. Life Sci Space Res (Amst) 2023; 37:18-24. [PMID: 37087175 DOI: 10.1016/j.lssr.2023.02.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Revised: 01/30/2023] [Accepted: 02/01/2023] [Indexed: 05/03/2023]
Abstract
The Committee on Space Research's (COSPAR) Planetary Protection Policy states that all types of missions to Venus are classified as Category II, as the planet has significant research interest relative to the processes of chemical evolution and the origin of life, but there is only a remote chance that terrestrial contamination can proliferate and compromise future investigations. "Remote chance" essentially implies the absence of environments where terrestrial organisms could survive and replicate. Hence, Category II missions only require simplified planetary protection documentation, including a planetary protection plan that outlines the intended or potential impact targets, brief Pre- and Post-launch analyses detailing impact strategies, and a Post-encounter and End-of-Mission Report. These requirements were applied in previous missions and are foreseen for the numerous new international missions planned for the exploration of Venus, which include NASA's VERITAS and DAVINCI missions, and ESA's EnVision mission. There are also several proposed missions including India's Shukrayaan-1, and Russia's Venera-D. These multiple plans for spacecraft coincide with a recent interest within the scientific community regarding the cloud layers of Venus, which have been suggested by some to be habitable environments. The proposed, privately funded, MIT/Rocket Lab Venus Life Finder mission is specifically designed to assess the habitability of the Venusian clouds and to search for signs of life. It includes up to three atmospheric probes, the first one targeting a launch in 2023. The COSPAR Panel on Planetary Protection evaluated scientific data that underpins the planetary protection requirements for Venus and the implications of this on the current policy. The Panel has done a thorough review of the current knowledge of the planet's conditions prevailing in the clouds. Based on the existing literature, we conclude that the environmental conditions within the Venusian clouds are orders of magnitude drier and more acidic than the tolerated survival limits of any known terrestrial extremophile organism. Because of this future orbital, landed or entry probe missions to Venus do not require extra planetary protection measures. This recommendation may be revised in the future if new observations or reanalysis of past data show any significant increment, of orders of magnitude, in the water content and the pH of the cloud layer.
Collapse
Affiliation(s)
- María Paz Zorzano
- Centro de Astrobiología (CAB), CSIC-INTA, Carretera de Ajalvir km 4, 28850, Torrejón de Ardoz, Madrid, Spain.
| | - Karen Olsson-Francis
- AstrobiologyOU, Faculty of Science, Technology, Engineering and Mathematics, The Open University, Milton Keynes, UK
| | - Peter T Doran
- Department of Geology and Geophysics, Louisiana State University, Baton Rouge, LA, USA
| | - Petra Rettberg
- Research Group Astrobiology, Institute of Aerospace Medicine, DLR, Koeln, Germany
| | - Athena Coustenis
- LESIA, Paris Observatory, CNRS, PSL Univ., 92195, Meudon Cedex, France
| | - Vyacheslav Ilyin
- Institute for Biomedical Problems, 123007, Khoroshevskoye shosse 76a, Moscow, Russia
| | - Francois Raulin
- Univ Paris Est Créteil and Université Paris Cité, CNRS, LISA, F-94010, Créteil, France
| | | | - Frank Groen
- NASA Headquarters, Washington, DC, 20546, USA
| | - Olivier Grasset
- Nantes Université, Univ Angers, Le Mans Université, CNRS, UMR 6112, Laboratoire de Planétologie et Géosciences, F-44000, Nantes, France
| | - Akiko Nakamura
- Department of Planetology, Kobe University, 657-8501, Kobe, Japan
| | - Olga Prieto Ballesteros
- Centro de Astrobiología (CAB), CSIC-INTA, Carretera de Ajalvir km 4, 28850, Torrejón de Ardoz, Madrid, Spain
| | - Silvio Sinibaldi
- Planetary Protection Officer, Independent Safety Office (TEC-QI), European Space Agency (ESA) - ESTEC, Keplerlaan 1, 2201, AZ, Noordwijk, the Netherlands
| | - Yohey Suzuki
- Department of Earth and Planetary Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
| | | | - Gerhard Kminek
- European Space Agency (ESA) - ESTEC, Keplerlaan 1, 2201, AZ, Noordwijk, the Netherlands
| | - Niklas Hedman
- Committee, Policy and Legal Affairs Section, Office for Outer Space Affairs, United Nations Office at Vienna, Austria
| | - Masaki Fujimoto
- Japan Aerospace Exploration Agency (JAXA), Institute of Space and Astronautical Science (ISAS), Kanagawa, Japan
| | - Maxim Zaitsev
- Planetary Physics Dept., Space Research Inst. of Russian Acad. of Sciences, Moscow, Russia
| | - Alex Hayes
- Cornell University, Ithaca, NY, 14853-6801, USA
| | - Jing Peng
- China National Space Administration, Beijing, China
| | | | | | - Kanyan Xu
- Laboratory of Space Microbiology, Shenzhou Space Biotechnology Group, Chinese Academy of Space Technology, Beijing, China
| |
Collapse
|
3
|
Ilyin V, Orlov O, Skedina M, Korosteleva A, Molodtsova D, Plotnikov E, Artamonov A. Mathematical Model of Antibiotic Resistance Determinants' Stability Under Space Flight Conditions. Astrobiology 2023; 23:407-414. [PMID: 36827596 DOI: 10.1089/ast.2022.0076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Increasing antibiotic resistance (AR) poses dangers of treatment complications and even treatment failure to astronauts. An AR determinant is a gene of resistance carried by bacteria. This article considers the issue of the stability of AR determinants and the influence of manned spaceflight conditions on this characteristic. A phenomenological model has been developed that makes it possible to evaluate the integral value of the stability of determinants of AR in bacteria as a function of time. Based on experimental results obtained during implementation of the SALYUT 7 space program, the stability of determinants of AR in Escherichia coli strains isolated before and after a spaceflight in 16 astronauts was evaluated. In addition, an assessment was made of the integral value of the stability of determinants of AR in bacteria during in vitro experiments, both in spaceflight and terrestrial conditions, after preincubation in space. The calculation using the developed phenomenological model showed that the stability of AR determinants in E. coli bacteria isolated from astronauts before the spaceflight is 33% higher than after the flight. The in vitro experiment carried out on board the International Space Station showed the opposite situation-an increase in the stability of AR determinants by 33% in cultures that have been in space compared with terrestrial control. This indicates an additional influence on the stability of determinants and of the astronaut's immune system, as well as space conditions. The common result in these two types of studies is the experimental fact that the largest number of bacteria, in space conditions, had two determinants of AR. The importance of fighting bacteria with two determinants is that at least three different antibiotics are required to have an effect. This circumstance makes it possible to predict a possible strategy for the use of antibiotics in autonomous spaceflights.
Collapse
Affiliation(s)
- Vyacheslav Ilyin
- Institute for Biomedical Problems, Russian Academy of Sciences (IMBP RAS), Moscow, Russia
| | - Oleg Orlov
- Institute for Biomedical Problems, Russian Academy of Sciences (IMBP RAS), Moscow, Russia
| | - Marina Skedina
- Institute for Biomedical Problems, Russian Academy of Sciences (IMBP RAS), Moscow, Russia
| | - Alexandra Korosteleva
- Institute for Biomedical Problems, Russian Academy of Sciences (IMBP RAS), Moscow, Russia
| | - Daria Molodtsova
- State Research Center-Burnasyan Federal Medical Biophysical Center of Federal Medical Biological Agency (SRC-FMBC), Moscow, Russia
| | - Evgenii Plotnikov
- Research School of Chemistry and Applied Biomedical Sciences, National Research Tomsk Polytechnic University, Tomsk, Russia
| | - Anton Artamonov
- Institute for Biomedical Problems, Russian Academy of Sciences (IMBP RAS), Moscow, Russia
| |
Collapse
|
4
|
Olsson-Francis K, Doran PT, Ilyin V, Raulin F, Rettberg P, Kminek G, Mier MPZ, Coustenis A, Hedman N, Shehhi OA, Ammannito E, Bernardini J, Fujimoto M, Grasset O, Groen F, Hayes A, Gallagher S, Kumar K P, Mustin C, Nakamura A, Seasly E, Suzuki Y, Peng J, Prieto-Ballesteros O, Sinibaldi S, Xu K, Zaitsev M. The COSPAR Planetary Protection Policy for robotic missions to Mars: A review of current scientific knowledge and future perspectives. Life Sci Space Res (Amst) 2023; 36:27-35. [PMID: 36682826 DOI: 10.1016/j.lssr.2022.12.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Revised: 12/07/2022] [Accepted: 12/09/2022] [Indexed: 06/17/2023]
Abstract
Planetary protection guidance for martian exploration has become a notable point of discussion over the last decade. This is due to increased scientific interest in the habitability of the red planet with updated techniques, missions becoming more attainable by smaller space agencies, and both the private sector and governments engaging in activities to facilitate commercial opportunities and human-crewed missions. The international standards for planetary protection have been developed through consultation with the scientific community and the space agencies by the Committee on Space Research's (COSPAR) Panel on Planetary Protection, which provides guidance for compliance with the Outer Space Treaty of 1967. In 2021, the Panel evaluated recent scientific data and literature regarding the planetary protection requirements for Mars and the implications of this on the guidelines. In this paper, we discuss the COSPAR Planetary Protection Policy for Mars, review the new scientific findings and discuss the next steps required to enable the next generation of robotic missions to Mars.
Collapse
Affiliation(s)
- Karen Olsson-Francis
- AstrobiologyOU, Faculty of Science, Technology, Engineering and Mathematics, The Open University, Milton Keynes, UK.
| | - Peter T Doran
- Department of Geology and Geophysics, Louisiana State, Baton Rouge, Louisiana, USA
| | - Vyacheslav Ilyin
- Institute for Biomedical Problems, Russian Academy of Sciences, Moscow, Russia
| | - Francois Raulin
- Univ Paris Est Cr Univ Paris Est Créteil and Université Paris Cité, CNRS, LISA, F-94010 Créteil, France
| | - Petra Rettberg
- German Aerospace Center (DLR), Institute of Aerospace Medicine, Radiation Biology Department, Research Group Astrobiology, 51147 Cologne, Germany
| | | | - María-Paz Zorzano Mier
- Centro deAstrobiología (CAB), CSIC-INTA, Carretera de Ajalvir km 4, 28850 Torrejón de Ardoz, Madrid, Spain
| | - Athena Coustenis
- LESIA, Paris Observatory, PSL University, CNRS, Paris University, 92195 Meudon Cedex, France
| | - Niklas Hedman
- Committee, Policy and Legal Affairs Section, Office for Outer Space Affairs, United Nations Office at Vienna, Austria
| | | | | | - James Bernardini
- Office of Safety and Mission Assurance, NASA Headquarters, Washington, DC 20546, USA
| | - Masaki Fujimoto
- Japan Aerospace Exploration Agency (JAXA), Institute of Space and Astronautical Science (ISAS), Kanagawa, Japan
| | | | - Frank Groen
- Office of Safety and Mission Assurance, NASA Headquarters, Washington, DC 20546, USA
| | - Alex Hayes
- Cornell University, Ithaca, NY 14853-6801, USA
| | - Sarah Gallagher
- Institute of Earth and Space Exploration, Western University, London, Ontario, Canada
| | | | | | - Akiko Nakamura
- Department of Earth and Planetary Science, The University of Tokyo,7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Elaine Seasly
- Office of Safety and Mission Assurance, NASA Headquarters, Washington, DC 20546, USA
| | - Yohey Suzuki
- Department of Earth and Planetary Science, The University of Tokyo,7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Jing Peng
- China National Space Administration, Beijing, China
| | - Olga Prieto-Ballesteros
- Centro deAstrobiología (CAB), CSIC-INTA, Carretera de Ajalvir km 4, 28850 Torrejón de Ardoz, Madrid, Spain
| | | | - Kanyan Xu
- Laboratory of Space Microbiology, Shenzhou Space Biotechnology Group, Chinese Academy of Space Technology, Beijing, China
| | - Maxim Zaitsev
- Planetary Physics Dept., Space Research Inst. of Russian Acad. of Sciences, Moscow, Russia
| |
Collapse
|
5
|
|
6
|
Rose M, Bobkov S, Ayyer K, Kurta RP, Dzhigaev D, Kim YY, Morgan AJ, Yoon CH, Westphal D, Bielecki J, Sellberg JA, Williams G, Maia FR, Yefanov OM, Ilyin V, Mancuso AP, Chapman HN, Hogue BG, Aquila A, Barty A, Vartanyants IA. Single-particle imaging without symmetry constraints at an X-ray free-electron laser. IUCrJ 2018; 5:727-736. [PMID: 30443357 PMCID: PMC6211532 DOI: 10.1107/s205225251801120x] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2018] [Accepted: 08/06/2018] [Indexed: 05/19/2023]
Abstract
The analysis of a single-particle imaging (SPI) experiment performed at the AMO beamline at LCLS as part of the SPI initiative is presented here. A workflow for the three-dimensional virus reconstruction of the PR772 bacteriophage from measured single-particle data is developed. It consists of several well defined steps including single-hit diffraction data classification, refined filtering of the classified data, reconstruction of three-dimensional scattered intensity from the experimental diffraction patterns by orientation determination and a final three-dimensional reconstruction of the virus electron density without symmetry constraints. The analysis developed here revealed and quantified nanoscale features of the PR772 virus measured in this experiment, with the obtained resolution better than 10 nm, with a clear indication that the structure was compressed in one direction and, as such, deviates from ideal icosahedral symmetry.
Collapse
Affiliation(s)
- Max Rose
- Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, Hamburg D-22607, Germany
| | - Sergey Bobkov
- National Research Centre ’Kurchatov Institute’, Akademika Kurchatova pl. 1, Moscow 123182, Russia
| | - Kartik Ayyer
- Center for Free Electron Laser Science (CFEL), Notkestrasse 85, Hamburg 22607, Germany
| | | | - Dmitry Dzhigaev
- Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, Hamburg D-22607, Germany
| | - Young Yong Kim
- Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, Hamburg D-22607, Germany
| | - Andrew J. Morgan
- Center for Free Electron Laser Science (CFEL), Notkestrasse 85, Hamburg 22607, Germany
| | - Chun Hong Yoon
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Daniel Westphal
- Laboratory of Molecular Biophysics, Department of Cell and Molecular Biology, Uppsala University, Sweden
| | - Johan Bielecki
- European XFEL GmbH, Holzkoppel 4, Schenefeld 22869, Germany
- Laboratory of Molecular Biophysics, Department of Cell and Molecular Biology, Uppsala University, Sweden
| | - Jonas A. Sellberg
- Laboratory of Molecular Biophysics, Department of Cell and Molecular Biology, Uppsala University, Sweden
- Biomedical and X-Ray Physics, Department of Applied Physics, AlbaNova University Center, KTH Royal Institute of Technology, Stockholm SE-106 91, Sweden
| | - Garth Williams
- Brookhaven National Laboratory, 98 Rochester St, Shirley, NY 11967, USA
| | - Filipe R.N.C. Maia
- Laboratory of Molecular Biophysics, Department of Cell and Molecular Biology, Uppsala University, Sweden
- NERSC, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Olexander M. Yefanov
- Center for Free Electron Laser Science (CFEL), Notkestrasse 85, Hamburg 22607, Germany
| | - Vyacheslav Ilyin
- National Research Centre ’Kurchatov Institute’, Akademika Kurchatova pl. 1, Moscow 123182, Russia
| | | | - Henry N. Chapman
- Center for Free Electron Laser Science (CFEL), Notkestrasse 85, Hamburg 22607, Germany
| | - Brenda G. Hogue
- Biodesign Center for Immunotherapy, Vaccines, and Virotherapy, Biodesign Institute at Arizona State University, Tempe 85287, USA
- Biodesign Center for Applied Structural Discovery, Biodesign Institute at Arizona State University, Tempe, AZ 85287, USA
- Arizona State University, School of Life Sciences (SOLS), Tempe, AZ 85287, USA
| | - Andrew Aquila
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
| | - Anton Barty
- Center for Free Electron Laser Science (CFEL), Notkestrasse 85, Hamburg 22607, Germany
| | - Ivan A. Vartanyants
- Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, Hamburg D-22607, Germany
- National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Kashirskoe shosse 31, Moscow 115409, Russia
| |
Collapse
|
7
|
Lindeboom REF, Ilgrande C, Carvajal-Arroyo JM, Coninx I, Van Hoey O, Roume H, Morozova J, Udert KM, Sas B, Paille C, Lasseur C, Ilyin V, Clauwaert P, Leys N, Vlaeminck SE. Nitrogen cycle microorganisms can be reactivated after Space exposure. Sci Rep 2018; 8:13783. [PMID: 30214003 PMCID: PMC6137101 DOI: 10.1038/s41598-018-32055-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2018] [Accepted: 08/28/2018] [Indexed: 11/09/2022] Open
Abstract
Long-term human Space missions depend on regenerative life support systems (RLSS) to produce food, water and oxygen from waste and metabolic products. Microbial biotechnology is efficient for nitrogen conversion, with nitrate or nitrogen gas as desirable products. A prerequisite to bioreactor operation in Space is the feasibility to reactivate cells exposed to microgravity and radiation. In this study, microorganisms capable of essential nitrogen cycle conversions were sent on a 44-days FOTON-M4 flight to Low Earth Orbit (LEO) and exposed to 10-3-10-4 g (gravitational constant) and 687 ± 170 µGy (Gray) d-1 (20 ± 4 °C), about the double of the radiation prevailing in the International Space Station (ISS). After return to Earth, axenic cultures, defined and reactor communities of ureolytic bacteria, ammonia oxidizing archaea and bacteria, nitrite oxidizing bacteria, denitrifiers and anammox bacteria could all be reactivated. Space exposure generally yielded similar or even higher nitrogen conversion rates as terrestrial preservation at a similar temperature, while terrestrial storage at 4 °C mostly resulted in the highest rates. Refrigerated Space exposure is proposed as a strategy to maximize the reactivation potential. For the first time, the combined potential of ureolysis, nitritation, nitratation, denitrification (nitrate reducing activity) and anammox is demonstrated as key enabler for resource recovery in human Space exploration.
Collapse
Affiliation(s)
- Ralph E F Lindeboom
- Center for Microbial Ecology and Technology (CMET), Ghent University, Coupure Links 653, 9000, Gent, Belgium.,Section Sanitary Engineering, Department of Water Management, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, 2628CN, Delft, The Netherlands
| | - Chiara Ilgrande
- Center for Microbial Ecology and Technology (CMET), Ghent University, Coupure Links 653, 9000, Gent, Belgium
| | - José M Carvajal-Arroyo
- Center for Microbial Ecology and Technology (CMET), Ghent University, Coupure Links 653, 9000, Gent, Belgium
| | - Ilse Coninx
- Unit of Microbiology, Belgian Nuclear Research Centre (SCK•CEN), Boeretang 200, 2400, Mol, Belgium
| | - Olivier Van Hoey
- Unit of Research in Dosimetric Applications, Belgian Nuclear Research Centre (SCK•CEN), Boeretang 200, 2400, Mol, Belgium
| | - Hugo Roume
- Center for Microbial Ecology and Technology (CMET), Ghent University, Coupure Links 653, 9000, Gent, Belgium.,MetaGenoPolis, INRA, Université Paris-Saclay Domaine de Vilvert, Bat. 325 78352, Jouy-en-Josas, France
| | - Julia Morozova
- Institute of Biomedical Problems (IMBP), State Research Center of The Russian Federation, Khoroshevskoye Shosse, 76a, 123007, Moscow, Russia
| | - Kai M Udert
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600, Dübendorf, Switzerland.,ETH Zürich, Institute of Environmental Engineering, 8093, Zürich, Switzerland
| | - Benedikt Sas
- Laboratory of Food Microbiology and Food Preservation, Ghent University, Coupure links 653, 9000, Gent, Belgium
| | | | | | - Vyacheslav Ilyin
- Institute of Biomedical Problems (IMBP), State Research Center of The Russian Federation, Khoroshevskoye Shosse, 76a, 123007, Moscow, Russia
| | - Peter Clauwaert
- Center for Microbial Ecology and Technology (CMET), Ghent University, Coupure Links 653, 9000, Gent, Belgium
| | - Natalie Leys
- Unit of Microbiology, Belgian Nuclear Research Centre (SCK•CEN), Boeretang 200, 2400, Mol, Belgium
| | - Siegfried E Vlaeminck
- Center for Microbial Ecology and Technology (CMET), Ghent University, Coupure Links 653, 9000, Gent, Belgium. .,Research of Sustainable Energy, Air and Water Technology, Department of Bioscience Engineering, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerpen, Belgium.
| |
Collapse
|
8
|
Byloos B, Coninx I, Van Hoey O, Cockell C, Nicholson N, Ilyin V, Van Houdt R, Boon N, Leys N. The Impact of Space Flight on Survival and Interaction of Cupriavidus metallidurans CH34 with Basalt, a Volcanic Moon Analog Rock. Front Microbiol 2017; 8:671. [PMID: 28503167 PMCID: PMC5408026 DOI: 10.3389/fmicb.2017.00671] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2017] [Accepted: 03/31/2017] [Indexed: 11/13/2022] Open
Abstract
Microbe-mineral interactions have become of interest for space exploration as microorganisms could be used to biomine from extra-terrestrial material and extract elements useful as micronutrients in life support systems. This research aimed to identify the impact of space flight on the long-term survival of Cupriavidus metallidurans CH34 in mineral water and the interaction with basalt, a lunar-type rock in preparation for the ESA spaceflight experiment, BIOROCK. Therefore, C. metallidurans CH34 cells were suspended in mineral water supplemented with or without crushed basalt and send for 3 months on board the Russian FOTON-M4 capsule. Long-term storage had a significant impact on cell physiology and energy status (by flow cytometry analysis, plate count and intracellular ATP measurements) as 60% of cells stored on ground lost their cell membrane potential, only 17% were still active, average ATP levels per cell were significantly lower and cultivability dropped to 1%. The cells stored in the presence of basalt and exposed to space flight conditions during storage however showed less dramatic changes in physiology, with only 16% of the cells lost their cell membrane potential and 24% were still active, leading to a higher cultivability (50%) and indicating a general positive effect of basalt and space flight on survival. Microbe-mineral interactions and biofilm formation was altered by spaceflight as less biofilm was formed on the basalt during flight conditions. Leaching from basalt also changed (measured with ICP-OES), showing that cells release more copper from basalt and the presence of cells also impacted iron and magnesium concentration irrespective of the presence of basalt. The flight conditions thus could counteract some of the detrimental effects observed after the 3 month storage conditions.
Collapse
Affiliation(s)
- Bo Byloos
- Microbiology Unit, Belgian Nuclear Research Centre, SCK•CENMol, Belgium.,Center for Microbial Ecology and Technology, Ghent UniversityGhent, Belgium
| | - Ilse Coninx
- Microbiology Unit, Belgian Nuclear Research Centre, SCK•CENMol, Belgium
| | - Olivier Van Hoey
- Research in Dosimetric Applications, Belgian Nuclear Research Centre, SCK•CENMol, Belgium
| | - Charles Cockell
- UK Centre for Astrobiology, School of Physics and Astronomy, University of EdinburghEdinburgh, UK
| | - Natasha Nicholson
- UK Centre for Astrobiology, School of Physics and Astronomy, University of EdinburghEdinburgh, UK
| | - Vyacheslav Ilyin
- Institute of Medical and Biological Problems of Russian Academy of SciencesMoscow, Russia
| | - Rob Van Houdt
- Microbiology Unit, Belgian Nuclear Research Centre, SCK•CENMol, Belgium
| | - Nico Boon
- Center for Microbial Ecology and Technology, Ghent UniversityGhent, Belgium
| | - Natalie Leys
- Microbiology Unit, Belgian Nuclear Research Centre, SCK•CENMol, Belgium
| |
Collapse
|
9
|
Abstract
Optically transparent, crack-free mesoporous titania and zirconia-doped titania thin films were fabricated by the sol—gel technique using the non-ionic amphiphilic triblock copolymer Pluronic P123 as the template. The structure and optical properties of these films were characterized using TEM, low-angle XRD, DTA/TG measurements, UV—vis spectroscopy and hexane adsorption investigations. It was found that addition of ZrO2 into the TiO2 matrix retarded sintering of the films, thereby increasing the specific surface area after treatment up to 500°C. The catalytic activity of the mesoporous TiO2 and TiO2/(5–30%) ZrO2 films in ethanol photo-oxidation increased with increasing specific surface area and surface acidity of the samples.
Collapse
Affiliation(s)
- Yu. Gnatyuk
- Institute of Surface Chemistry, Ukrainian National Academy of Sciences, 17 General Naumov Str., Kiev 03164, Ukraine
| | - N. Smirnova
- Institute of Surface Chemistry, Ukrainian National Academy of Sciences, 17 General Naumov Str., Kiev 03164, Ukraine
| | - A. Eremenko
- Institute of Surface Chemistry, Ukrainian National Academy of Sciences, 17 General Naumov Str., Kiev 03164, Ukraine
| | - V. Ilyin
- L.V. Pisarzhevsky Institute of Physical Chemistry, Ukrainian National Academy of Sciences, 31 Nauki Str., Kiev 03039, Ukraine
| |
Collapse
|
10
|
|
11
|
Sali A, Eswar N, Pieper U, Marti-Renom MA, Madhusudhan M, Fiser A, Ilyin V. Comparative protein structure modeling of genes and genomes. Acta Crystallogr A 2002. [DOI: 10.1107/s0108767302087068] [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: 11/11/2022] Open
|
12
|
Bonanno JB, Edo C, Eswar N, Pieper U, Romanowski MJ, Ilyin V, Gerchman SE, Kycia H, Studier FW, Sali A, Burley SK. Structural genomics of enzymes involved in sterol/isoprenoid biosynthesis. Proc Natl Acad Sci U S A 2001; 98:12896-901. [PMID: 11698677 PMCID: PMC60796 DOI: 10.1073/pnas.181466998] [Citation(s) in RCA: 100] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
X-ray structures of two enzymes in the sterol/isoprenoid biosynthesis pathway have been determined in a structural genomics pilot study. Mevalonate-5-diphosphate decarboxylase (MDD) is a single-domain alpha/beta protein that catalyzes the last of three sequential ATP-dependent reactions which convert mevalonate to isopentenyl diphosphate. Isopentenyl disphosphate isomerase (IDI) is an alpha/beta metalloenzyme that catalyzes interconversion of isopentenyl diphosphate and dimethylallyl diphosphate, which condense in the next step toward synthesis of sterols and a host of natural products. Homology modeling of related proteins and comparisons of the MDD and IDI structures with two other experimentally determined structures have shown that MDD is a member of the GHMP superfamily of small-molecule kinases and IDI is similar to the nudix hydrolases, which act on nucleotide diphosphatecontaining substrates. Structural models were produced for 379 proteins, encompassing a substantial fraction of both protein superfamilies. All three enzymes responsible for synthesis of isopentenyl diphosphate from mevalonate (mevalonate kinase, phosphomevalonate kinase, and MDD) share the same fold, catalyze phosphorylation of chemically similar substrates (MDD decarboxylation involves phosphorylation of mevalonate diphosphate), and seem to have evolved from a common ancestor. These structures and the structural models derived from them provide a framework for interpreting biochemical function and evolutionary relationships.
Collapse
Affiliation(s)
- J B Bonanno
- Laboratories of Molecular Biophysics, Howard Hughes Medical Institute, The Rockefeller University, 1230 York Avenue, New York, NY 10021, USA
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
13
|
Cai SX, Kher SM, Zhou ZL, Ilyin V, Espitia SA, Tran M, Hawkinson JE, Woodward RM, Weber E, Keana JF. Structure-activity relationships of alkyl- and alkoxy-substituted 1,4-dihydroquinoxaline-2,3-diones: potent and systemically active antagonists for the glycine site of the NMDA receptor. J Med Chem 1997; 40:730-8. [PMID: 9057859 DOI: 10.1021/jm960654b] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
We report on a series of alkyl- and alkoxy-substituted 1,4-dihydroquinoxaline-2,3-diones (QXs), prepared as a continuation of our structure-activity relationship (SAR) study of QXs as antagonists for the glycine site of the N-methyl-D-aspartate (NMDA) receptor. The in vitro potency of these antagonists was determined by displacement of the glycine site radioligand [3H]-5,7-dichlorokynurenic acid ([3H]DCKA) in rat brain cortical membranes. In general, methyl is a good replacement for chloro or bromo in the 6-position, and alkoxy-substituted QXs have lower potencies than alkyl- or halogen-substituted QXs. Ethyl-substituted QXs are generally less potent than methyl-substituted QXs, especially in the 6-position of 5,6,7-trisubstituted QXs. Fusion of a ring system at the 6,7-positions results in QXs with low potency. Several methyl-substituted QXs are potent glycine site antagonists that have surprisingly high in vivo activity in the maximal electroshock (MES) test in mice. Among these, 7-chloro-6-methyl-5-nitro QX (14g) (IC50 = 5 nM) and 7-bromo-6-methyl-5-nitro QX (14f) (IC50 = 9 nM) are comparable in potency to 6,7-dichloro-5-nitro QX (2) (ACEA 1021) as glycine site antagonists. QX 14g has an ED50 value of 1.2 mg/kg iv in the mouse MES assay. Interestingly, alkyl QXs with log P values of 0.5 or less tend to be more bioavailable than QXs with higher log P values. QX 14g has 440-fold selectivity for NMDA vs alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptors, as determined electrophysiologically under steady-state conditions in oocytes expressing rat cerebral cortex poly(A)+ RNA. Overall, 14g was found to have the best combination of in vitro and in vivo potency of all the compounds tested in this and previous studies on the QX series.
Collapse
Affiliation(s)
- S X Cai
- CoCensys Inc., Irvine, California 92618, USA
| | | | | | | | | | | | | | | | | | | |
Collapse
|
14
|
Carter Jr CW, Ilyin V, Huang X, Li G. Joint maximum entropy and non-crystallographic symmetry constraints in model-independent map refinement. Acta Crystallogr A 1996. [DOI: 10.1107/s0108767396095839] [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: 11/10/2022] Open
|
15
|
Ilyin V, Carter Jr CW, Winborne E, Temple B, Li G. 2.9 Å crystal structure of ligand-free tryptophanyl-tRNA synthetase. Acta Crystallogr A 1996. [DOI: 10.1107/s0108767396092689] [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: 11/10/2022] Open
|
16
|
Abstract
Inositol 1,4,5-trisphosphate (InsP3) acts on intracellular receptors to cause liberation of Ca2+ ions into the cytosol as repetitive spikes and propagating waves. We studied the processes underlying this regenerative release of Ca2+ by monitoring with high resolution the kinetics of Ca2+ flux evoked in Xenopus oocytes by flash photolysis of caged InsP3. Confocal microfluorimetry was used to monitor intracellular free [Ca2+] from femtoliter volumes within the cell, and the underlying Ca2+ flux was then derived from the rate of increase of the fluorescence signals. A threshold amount of InsP3 had to be photoreleased to evoke any appreciable Ca2+ signal, and the amount of liberated Ca2+ then increased only approximately fourfold with maximal stimulation, whereas the peak rate of increase of Ca2+ varied over a range of nearly 20-fold, reaching a maximum of approximately 150 microMs-1. Ca2+ flux increased as a first-order function of [InsP3]. Indicating a lack of cooperativity in channel opening, and was half-maximal with stimuli approximately 10 times threshold. After a brief photolysis flash, Ca2+ efflux began after a quiescent latent period that shortened from several hundred milliseconds with near-threshold stimuli to 25 ms with maximal flashes. This delay could not be explained by an initial "foot" of Ca2+ increasing toward a threshold at which regenerative release was triggered, and the onset of release seemed too abrupt to be accounted for by multiple sequential steps involved in channel opening. Ca2+ efflux increased to a maximum after the latent period in a time that reduced from > 100 ms to approximately 8 ms with increasing [InsP3] and subsequently declined along a two-exponential time course: a rapid fall with a time constant shortening from > 100 ms to approximately 25 ms with increasing [InsP3], followed by a much smaller fail persisting for several seconds. The results are discussed in terms of a model in which InsP3 receptors must undergo a slow transition after binding InsP3 before they can be activated by cytosolic Ca2+ acting as a co-agonist. Positive feedback by liberated Ca2+ ions then leads to a rapid increase in efflux to a maximal rate set by the proportion of receptors binding InsP3. Subsequently, Ca2+ efflux terminates because of a slower inhibitory action of cytosolic Ca2+ on gating of InsP3 receptor-channels.
Collapse
MESH Headings
- Animals
- Biophysical Phenomena
- Biophysics
- Calcium/metabolism
- Calcium Channels/drug effects
- Calcium Channels/metabolism
- Cytosol/metabolism
- Female
- In Vitro Techniques
- Inositol 1,4,5-Trisphosphate/analogs & derivatives
- Inositol 1,4,5-Trisphosphate/pharmacology
- Inositol 1,4,5-Trisphosphate/radiation effects
- Inositol 1,4,5-Trisphosphate Receptors
- Ion Channel Gating
- Ion Transport/drug effects
- Kinetics
- Oocytes/drug effects
- Oocytes/metabolism
- Photolysis
- Receptors, Cytoplasmic and Nuclear/drug effects
- Receptors, Cytoplasmic and Nuclear/metabolism
- Receptors, Nicotinic/metabolism
- Stochastic Processes
- Xenopus laevis
Collapse
Affiliation(s)
- I Parker
- Department of Psychobiology, University of California, Irvine 92717 USA.
| | | | | |
Collapse
|
17
|
Keana JF, Kher SM, Cai SX, Dinsmore CM, Glenn AG, Guastella J, Huang JC, Ilyin V, Lü Y, Mouser PL. Synthesis and structure-activity relationships of substituted 1,4-dihydroquinoxaline-2,3-diones: antagonists of N-methyl-D-aspartate (NMDA) receptor glycine sites and non-NMDA glutamate receptors. J Med Chem 1995; 38:4367-79. [PMID: 7473565 DOI: 10.1021/jm00022a003] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
A series of mono-, di-, tri-, and tetrasubstituted 1,4-dihydroquinoxaline-2,3-diones (QXs) were synthesized and evaluated as antagonists at N-methyl-D-aspartate (NMDA)/glycine sites and alpha-amino-3-hydroxy-5-methylisoxazole-4-propionic acid-preferring non-NMDA receptors. Antagonist potencies were measured by electrical assays in Xenopus oocytes expressing rat whole brain poly(A)+ RNA. Trisubstituted QXs 17a (ACEA 1021), 17b (ACEA 1031), 24a, and 27, containing a nitro group in the 5 position and halogen in the 6 and 7 positions, displayed high potency (Kb approximately 6-8 nM) at the glycine site, moderate potency at non-NMDA receptors (Kb = 0.9-1.5 microM), and the highest (120-250-fold) selectivity in favor of glycine site antagonism over non-NMDA receptors. Tetrasubstituted QXs 17d,e were more than 100-fold weaker glycine site antagonists than the corresponding trisubstituted QXs with F being better tolerated than Cl as a substituent at the 8 position. Di- and monosubstituted QXs showed progressively weaker antagonism compared to trisubstituted analogues. For example, removal of the 5-nitro group of 17a results in a approximately 100-fold decrease in potency (10a,b,z), while removal of both halogens from 17a results in a approximately 3000-fold decrease in potency (10v). In terms of steady-state inhibition, most QX substitution patterns favor antagonism at NMDA/glycine sites over antagonism at non-NMDA receptors. Among the QXs tested, only 17i was slightly selective for non-NMDA receptors.
Collapse
Affiliation(s)
- J F Keana
- Department of Chemistry, University of Oregon, Eugene 97403, USA
| | | | | | | | | | | | | | | | | | | |
Collapse
|
18
|
Abstract
1. Calcium liberation induced in Xenopus oocytes by flash photorelease of inositol 1,4,5-trisphosphate (InsP3) from a caged precursor was monitored by confocal microfluorimetry. The object was to determine whether inhibition of Ca2+ release seen with paired flashes arose as a direct consequence of elevated cytosolic free [Ca2+]. 2. Responses evoked by just-suprathreshold test flashes were not inhibited by subthreshold conditioning flashes, but were strongly suppressed when conditioning flashes were raised above threshold. 3. Inhibition at first increased progressively as the inter-flash interval was lengthened to about 2 s and thereafter declined, with a half-recovery at about 4 s. 4. Intracellular injections of Ca2+ caused relatively slight inhibition of InsP3-evoked signals, even when cytosolic free [Ca2+] was elevated to levels similar to those at which strong inhibition was seen in paired-flash experiments. 5. Recovery from inhibition was not appreciably slowed when Ca2+ was injected to raise the free Ca2+ level between paired flashes. 6. We conclude that inhibition of InsP3-evoked Ca2+ liberation is not directly proportional to cytosolic free Ca2+ level and that recovery from inhibition in paired-pulse experiments involves factors other than the decline of cytosolic [Ca2+] following a conditioning response.
Collapse
Affiliation(s)
- V Ilyin
- Department of Psychobiology, University of California, Irvine 92717
| | | |
Collapse
|
19
|
Abstract
1. The effects of ethanol and other alcohols on inositol 1,4,5-trisphosphate (InsP3) signalling were studied in Xenopus oocytes by the use of flash photolysis of caged InsP3. Calcium liberation induced by InsP3 was monitored by voltage-clamp recording of Ca(2+)-activated membrane currents, and by fluorescence of the Ca2+ indicator Fluo-3. 2. Membrane current and fluorescence Ca2+ signals evoked by light flashes giving small responses were initially potentiated by bath application of ethanol (80-400 mM). However, the responses subsequently declined while ethanol was present and were strongly reduced or suppressed when it was removed. 3. These effects did not arise artifactually from changes in photolysis of caged InsP3, as similar results were seen with responses evoked by intracellular injections of InsP3. Also, the effects on the membrane current did not arise primarily through actions on the Ca(2+)-dependent Cl- channels, since currents evoked by intracellular injections of Ca2+ were little changed by ethanol. 4. Ethanol reduced the threshold level of InsP3 required to cause Ca2+ liberation. Thus, potentiation was most prominent with small responses evoked by brief light flashes, whereas the predominant effect on larger responses was inhibitory. 5. The facilitatory and inhibitory actions of ethanol persisted after removing extracellular Ca2+. 6. Intracellular injections of ethanol produced an initial inhibition of InsP3 responses, followed, in some oocytes, by a potentiation. 7. Methanol had little effect on InsP3 responses, whereas butanol and other long-chain alcohols produced strong inhibition, but little or no potentiation. 8. We conclude that extracellular application of ethanol produces a rapid potentiation of InsP3-mediated Ca2+ liberation, and a more slowly developing inhibition. The potentiation may arise through stimulation of InsP3 formation at the plasma membrane, whereas the inhibition occurs more deeply in the cell. Both actions were evident at relatively low concentrations (a few tens of millimoles per litre), and might thus be important in the behavioural effects of ethanol intoxication.
Collapse
Affiliation(s)
- V Ilyin
- Department of Psychobiology, University of California, Irvine 92717
| | | |
Collapse
|