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  • 1
    Online Resource
    Online Resource
    Dordrecht :Springer Netherlands,
    Keywords: Oceanography. ; Electronic books.
    Description / Table of Contents: Proceedings of the NATO Advanced Research Workshop on Geohydrological Management of Sea Level and Mitigation of Drought, Fuerteventura, Canary Islands, Spain, March 1-7, 1989.
    Type of Medium: Online Resource
    Pages: 1 online resource (711 pages)
    Edition: 1st ed.
    ISBN: 9789400907010
    Series Statement: Nato Science Series C: Series ; v.325
    Language: English
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  • 2
    Online Resource
    Online Resource
    Amsterdam :IOS Press, Incorporated,
    Keywords: Exobiology-Congresses. ; Life on other planets-Congresses. ; Electronic books.
    Description / Table of Contents: Astrobiology is the multi-disciplinary field devoted to the investigation of the origin; physical, chemical and environmental limitations; and the distribution in space and time of life on Earth and in the Cosmos. Astrobiology seeks an answer to one of the most fundamental of all questions: Is Life Restricted to Planet Earth or is Life a Cosmic Imperative? Understanding the characteristics, properties, habits and diversity of living organisms on Earth is crucial to determine where and how to search for evidence of life elsewhere. New techniques and methodologies must be developed in order to determine a suitable suite of valid biomarkers that is needed to facilitate the differentiation of abiotic processes from true signatures of life. This is crucial to establish the criteria needed to properly evaluate potential biosignatures in ancient Earth rocks and in a wide variety of Astromaterials. This volume includes papers treating many of these topics. They range from considerations of relict microbial communities of extreme environments to complex organic molecules. Other papers discuss the use of stable isotopes and their biological fractionation as a baseline for evaluating extraterrestrial evidence and the use of chirality and composition of indigenous amino acids for differentiating between terrestrial and extraterrestrial organic matter in Astromaterials. Also treated in this volume are geomorph parallels, sediment patterns, and cyclicities in permafrost sediments of Earth and Mars; the survival of bacteria in space, eclipsing binaries and advanced DNA and protein chip technology for future robotic missions to search for life in the Solar System.
    Type of Medium: Online Resource
    Pages: 1 online resource (232 pages)
    Edition: 1st ed.
    ISBN: 9781607501152
    Series Statement: NATO Science Series, I: Life and Behavioural Sciences Series ; v.366
    DDC: 576.839
    Language: English
    Note: Title page -- Preface -- Acknowledgements -- NATO Participants -- List of Student Participants -- Contents -- Nature of Framboidal Structures in Black Shales (the Cambrian of the Siberian Platform and the Permian of the Barents Sea Shelf) -- Bacteriomorphic Structures From the Sinsk Formation (Lower Cambrian of the Siberian Platform) -- Constraining Subglacial Settings Using Clay-Supported Ice Rafted Detritus (Mud Grains) in Antarctic Marine Sediment: A Framework for Astrobiology -- Apsidal Motion Problem in the Eclipsing Binary Star DR Vulpeculae -- Amino Acids: Probes for Life's Origin in the Solar System -- Mineralization of Cyanobacteria -- Microfossils, Biominerals, and Chemical Biomarkers in Meteorites -- Survival of Microorganisms in Space, an Experimental Contribution to the Discussion on Viable Transfer of Life in the Solar System -- Reactions of Urazole and its Analogs with Sugars and Metals under Prebiotic Conditions -- Apatite as Biosignature -- Tikhov's Astrobotany as a Prelude to Modern Astrobiology -- Computation of Sediment Cycles on Mars and Earth -- Landscape, Sediment, Red Soil, Permafrost Geomorph Parallels on Earth and Mars -- Biochemical Markers in Rock Coatings -- The Influence of Space Parameters like Solar Ultraviolet Radiation on the Survival of Microorganisms -- Bacterial Paleontology -- Paleobiological and Biogeochemical Vestiges of Early Terrestrial Biota: Baseline for Evaluation of Extraterrestrial Evidence -- Formation of Ordered Structures of Charged Grains in Gas-Dusty Atmospheres of Planets and Comets during Lightning Discharge -- Exobiology of Titan -- The Role of Living and Nonliving Organic Matter in Volkonskoite Formation -- Astrobiotechnology: Alternative Concepts for Astrobiology Solar System Exploration -- The Study of Remains of Microorganisms in Ancient Earth Sedimentary Rocks for Astrobiology. , Recent Microbiology and Precambrian Paleontology -- Author Index.
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  • 3
    Online Resource
    Online Resource
    Dordrecht :Springer Netherlands,
    Keywords: Permafrost -- Congresses. ; Electronic books.
    Description / Table of Contents: Proceedings of the NATO Advanced Research Workshop, Novosibirsk, Russia, 12-16 November 1998.
    Type of Medium: Online Resource
    Pages: 1 online resource (625 pages)
    Edition: 1st ed.
    ISBN: 9789401006842
    Series Statement: NATO Science Partnership Subseries: 2 Series ; v.76
    DDC: 577.5/8627
    Language: English
    Note: Intro -- Title page -- Copyright -- TABLE OF CONTENTS.
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  • 4
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Plant Science Letters 31 (1983), S. 19-34 
    ISSN: 0304-4211
    Keywords: Cell size ; Consecutive androgeneses ; Doubled haploid plants ; Leaf morphology ; Nicotiana sylvestris ; Peroxidase
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0168-9452
    Keywords: DNA ; Nicotiana sylvestris ; androgenesis ; cytophotometry ; flow cytometry ; pollen nuclei
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-0983
    Keywords: Somaclonal variation ; Mitochondrial DNA ; Protein synthesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary One fertile and two male-sterile diploid plants were regenerated from the same callus after two cycles of protoplast culture from fertile Nicotiana sylvestris. Genetic studies indicated that the male-sterile trait was under cytoplasmic control. Progenies of each regenerated plant possessed different mitochondrial (mt) DNA restriction patterns. Both cms protoclone types were characterized by specific mtDNA deletions. In addition, a 40 kD mitochondrially encoded polypeptide is lacking in the cms plants.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-0983
    Keywords: mtDNA ; Recombination ; CMS ; N. sylvestris
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Two cytoplasmic male-sterile plants (CMSI and CMSII) were obtained by protoplast culture in Nicotiana sylvestris. Both plants showed large deletions (up to 50 kb) in their mitochondrial DNA. Restriction maps of the reorganized regions suggested that the deletions occurred via two homologous recombination events (rec. 1 and rec. 2) in the parental mitochondrial genome. With the exception of nad5, no mitochondrial DNA polymorphism could be detected between parental and CMS lines using different heterologous genes probes. A sequence homologous to the Oenothera nad5 mitochondrial gene was located close to the CMSI-specific rec. 2 region. Moreover, a cDNA probe corresponding to total mitochondrial RNA from the parent line was found to hybridize to mitochondrial DNA fragments involved in the rec. 1 event common to both CMS lines, suggesting that rec. 1 lies in a transcribed region. Cytoplasmic male sterility in the Nicotiana sylvestris CMS mutants could be due either to gene deletion or to a regulatory effect of such a deletion on mitochondrial gene expression, rather than to the presence of specific polypeptides as has been shown in the T cytoplasm of maize, or in CMS Petunia.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical and applied genetics 59 (1981), S. 177-184 
    ISSN: 1432-2242
    Keywords: Androgenesis ; Doubled-haploid (D.H.) ; Mendelian segregation ; Quantitative variation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary All diploid plants (doubled-haploid plants: D.H.) regenerated by androgenesis from binucleated pollen grains in Nicotiana sylvestris differ genetically from the original line as far as morphological features and growth rates are concerned. This androgenic variation (A.V.) is under nuclear control and is transmitted continuously by some D.H. for at least four generations of selfing; other D.H. progenies segregate. Further androgeneses carried out on one single D.H. reveal a new variability and increase the drift from the original line. All results cannot be explained by the presence of residual heterozygosity in the original line, and we suggest that most of the A.V. could originate from changes that occur in the DNA of the vegetative pollen grain cell. D.H. resulting from endomitosis of the vegetative cell would be ‘homozygous’ and stable, whereas D.H. resulting from nuclear fusion between a vegetative and a generative cell would be ‘heterozygous’ and would segregate in seeds through succeeding generations.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1617-4623
    Keywords: Protoplast culture ; Nuclear male sterility ; Mitochondrial DNA recombination ; Substoichiometric molecules ; Nicotiana sylvestris
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary ANicotiana sylvestris plant regenerated from protoplast culture was found to be mutated in both the mitochondrial (mt) and nuclear genomes. The novel mt DNA organization, called U, is due to the amplification of recombinant substoichiometric DNA sequences that preexist in the parent line. The recombination event involves two 404 by repeats, which hybridize to a 2.1 kb transcript. Although the sequence of both repeats was not altered by the recombination, an additional transcript of 2.5 kb was detected in U mitochondria. In addition to this mitochondrial reorganization, the protoclone carried a recessive nuclear mutation conferring male sterility (ms4). A possible role ofms4 in the appearance of the U mt DNA organization was investigated by introducing this gene into normalN. sylvestris cytoplasm. No mt DNA change could be found in homozygousms4/ms4 plants of the F2 generation.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1617-4623
    Keywords: Protoplast culture ; Nuclear and cytoplasmic male sterility ; Mitochondrial DNA and proteins ; Nicotiana sylvestris
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Male sterile plants appeared in the progeny of three fertile plants obtained after one cycle of protoplast culture from a fertile botanical line and two androgenetic lines ofNicotiana sylvestris. These plants showed the same foliar and floral abnormalities as the cytoplasmic male sterile (cms) mitochondrial variants obtained after two cycles of culture. We show that male sterility in these plants is controlled by three independent nuclear genes,ms1, ms2 andms3, while no changes can be seen in the mitochondrial genome. However, differences were found between thein organello mitochondrial protein synthesis patterns of male sterile and parent plants. Two reproducible changes were observed: the presence of a new 20 kDa polypeptide and the absence of a 40 kDa one. Such variations were described previously in mitochondrial protein synthesis patterns of the cms lines. Fertile hybrids of male sterile plants showed normal synthesis patterns. The male sterile plants are thus mutated in nuclear genes involved in changes observed in mitochondrial protein synthesis patterns.
    Type of Medium: Electronic Resource
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