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  • Nature Publishing Group  (363,841)
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Language
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  • 1
    Journal cover
    Shanghai Institute of Materia Medica, Chinese Academy of Sciences | Nature Publishing Group
    Online: 1.1980 – (older than 12 months)
    Publisher: Shanghai Institute of Materia Medica, Chinese Academy of Sciences , Nature Publishing Group
    Print ISSN: 1671-4083
    Electronic ISSN: 0253-9756
    Topics: Chemistry and Pharmacology , Medicine
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  • 2
    Journal cover
    Nature Publishing Group | Cell Death Differentiation Association
    Online: 2015 –
    Publisher: Nature Publishing Group , Cell Death Differentiation Association
    Electronic ISSN: 2058-7716
    Topics: Biology , Medicine
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  • 3
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    Nature Publishing Group | ISME (International Society for Microbial Ecology)
    Online: 1.2007 –
    Publisher: Nature Publishing Group , ISME (International Society for Microbial Ecology)
    Corporation: International Society for Microbial Ecology, ISME
    Print ISSN: 1751-7362
    Electronic ISSN: 1751-7370
    Topics: Biology
    Keywords: Mikrobiologie ; Mikrobiologie
    Parallel titles: The ISME Journal
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  • 4
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    Nature Publishing Group | ISME (International Society for Microbial Ecology), PubMed Central
    Online: 1.2007 – (older than 12 months)
    Publisher: Nature Publishing Group , ISME (International Society for Microbial Ecology), PubMed Central
    Corporation: International Society for Microbial Ecology, ISME
    Print ISSN: 1751-7362
    Electronic ISSN: 1751-7370
    Topics: Biology
    Keywords: Mikrobiologie ; Mikrobiologie
    Parallel titles: The ISME Journal
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  • 5
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    Nature Publishing Group
    Online: 22.1977 – (older than 5 years)
    Publisher: Nature Publishing Group
    Print ISSN: 1434-5161
    Electronic ISSN: 1435-232X
    Topics: Biology , Medicine
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  • 6
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    Nature Publishing Group
    Online: 1.1983 –
    Formerly as: Bio-Technology  (1983–1996)
    Publisher: Nature Publishing Group
    Print ISSN: 0733-222X , 1087-0156
    Electronic ISSN: 1546-1696
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
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  • 7
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    Nature Publishing Group
    Online: 229(1).1971 – 246(155).1973
    Publisher: Nature Publishing Group
    Print ISSN: 0090-0028 , 0369-4887
    Electronic ISSN: 1476-4687
    Topics: Biology
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  • 8
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    Nature Publishing Group
    Online: 1.2015 –
    Publisher: Nature Publishing Group
    Print ISSN: 2055-026X
    Electronic ISSN: 2055-0278
    Topics: Chemistry and Pharmacology
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  • 9
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    Nature Publishing Group
    Online: 1.2000 –
    Publisher: Nature Publishing Group
    Print ISSN: 1471-0072
    Electronic ISSN: 1471-0080
    Topics: Biology
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  • 10
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    Nature Publishing Group
    Online: 1.2004 –
    Publisher: Nature Publishing Group
    Print ISSN: 1548-7091
    Electronic ISSN: 1548-7105
    Topics: Biology , Medicine
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  • 11
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    Nature Publishing Group
    Online: 1.1999 –
    Publisher: Nature Publishing Group
    Print ISSN: 1465-7392
    Electronic ISSN: 1476-4679
    Topics: Biology , Medicine
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  • 12
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    Nature Publishing Group
    Online: 1(1).2010 –
    Publisher: Nature Publishing Group
    Electronic ISSN: 2041-1723
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General , Physics
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  • 13
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    Nature Publishing Group
    Online: 1.1992 –
    Publisher: Nature Publishing Group
    Print ISSN: 1061-4036
    Electronic ISSN: 1546-1718
    Topics: Biology , Medicine
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  • 14
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    Nature Publishing Group
    Online: 1998 –
    Publisher: Nature Publishing Group
    Electronic ISSN: 1744-7933
    Topics: Natural Sciences in General
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  • 15
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    Nature Publishing Group
    Online: 1.2007 –
    Publisher: Nature Publishing Group
    Print ISSN: 1754-2189
    Electronic ISSN: 1750-2799
    Topics: Natural Sciences in General
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  • 16
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    Nature Publishing Group | Tokyo Institute of Technology
    Online: 1(1).2009 –
    Publisher: Nature Publishing Group , Tokyo Institute of Technology
    Print ISSN: 1884-4049
    Electronic ISSN: 1884-4057
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 17
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    Nature Publishing Group
    Online: 1.2001 –
    Publisher: Nature Publishing Group
    Print ISSN: 1470-269X
    Electronic ISSN: 1473-1150
    Topics: Chemistry and Pharmacology
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  • 18
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    Nature Publishing Group | JSTOR
    Online: 1(1).1845 –
    Print: 268.1993 – 303(5).2010 (Location: A17, Kompaktmagazin, 64/5-6)
    Print: 270.1994 – 282.2000 (Location: A17, Kompaktmagazin, 64/5-6)
    Publisher: Nature Publishing Group , JSTOR
    Print ISSN: 0036-8733
    Electronic ISSN: 1946-7087
    Topics: Biology , Natural Sciences in General , Physics
    Abbreviation: Sci Am
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  • 19
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    Nature Publishing Group
    Online: 1.2010 –
    Publisher: Nature Publishing Group
    Electronic ISSN: 2041-4889
    Topics: Biology , Medicine
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  • 20
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    Shanghai Institute of Cell Biology | Nature Publishing Group
    Online: 1.1990 – (older than 12 months)
    Publisher: Shanghai Institute of Cell Biology , Nature Publishing Group
    Print ISSN: 1001-0602
    Electronic ISSN: 1748-7838
    Topics: Biology , Medicine
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  • 21
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    Nature Publishing Group
    Online: 1.1999 – (older than 5 years)
    Publisher: Nature Publishing Group
    Print ISSN: 1466-4879
    Electronic ISSN: 1476-5470
    Topics: Biology , Medicine
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  • 22
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    Nature Publishing Group
    Online: 4.1997 – (older than 5 years)
    Publisher: Nature Publishing Group
    Print ISSN: 0969-7128
    Electronic ISSN: 1476-5462
    Topics: Biology , Medicine
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  • 23
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    Nature Publishing Group
    Online: 4.1997 –
    Publisher: Nature Publishing Group
    Print ISSN: 0969-7128
    Electronic ISSN: 1476-5462
    Topics: Biology , Medicine
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  • 24
    Journal cover
    Nanjing Agricultural University | Nature Publishing Group
    Online: 1.2014 –
    Publisher: Nanjing Agricultural University , Nature Publishing Group
    Electronic ISSN: 2052-7276
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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  • 25
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    Japan Antibiotics Research Association | Nature Publishing Group
    Online: 58.2005 – (older than 5 years)
    Publisher: Japan Antibiotics Research Association , Nature Publishing Group
    Print ISSN: 0021-8820 , 0368-3532
    Electronic ISSN: 1881-1469
    Topics: Chemistry and Pharmacology , Medicine
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  • 26
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    Japan Antibiotics Research Association | Nature Publishing Group
    Online: 58.2005 –
    Publisher: Japan Antibiotics Research Association , Nature Publishing Group
    Print ISSN: 0021-8820 , 0368-3532
    Electronic ISSN: 1881-1469
    Topics: Chemistry and Pharmacology , Medicine
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  • 27
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    Nature Publishing Group
    Online: 22.1977 –
    Publisher: Nature Publishing Group
    Print ISSN: 1434-5161
    Electronic ISSN: 1435-232X
    Topics: Biology , Medicine
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  • 28
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    Nature Publishing Group
    Online: 2006 – 2012
    Publisher: Nature Publishing Group
    Electronic ISSN: 1756-0357
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Medicine , Natural Sciences in General , Physics
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  • 29
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    Nature Publishing Group
    Online: 2007 – 2009
    Publisher: Nature Publishing Group
    Electronic ISSN: 1754-8705
    Topics: Biology , Medicine
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  • 30
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    Nature Publishing Group
    Online: 1.2000 –
    Publisher: Nature Publishing Group
    Print ISSN: 1471-0056
    Electronic ISSN: 1471-0064
    Topics: Biology , Medicine
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  • 31
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    Nature Publishing Group
    Online: 1.2000 –
    Publisher: Nature Publishing Group
    Print ISSN: 1471-003X
    Electronic ISSN: 1471-0048
    Topics: Biology , Medicine
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  • 32
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    Nature Publishing Group
    Online: 1.2000 –
    Publisher: Nature Publishing Group
    Print ISSN: 1529-2908
    Electronic ISSN: 1529-2916
    Topics: Biology , Medicine
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  • 33
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    Nature Publishing Group
    Online: 1.1995 –
    Publisher: Nature Publishing Group
    Print ISSN: 1078-8956
    Electronic ISSN: 1546-170X
    Topics: Biology , Medicine
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  • 34
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    Nature Publishing Group
    Online: 1.2009 –
    Publisher: Nature Publishing Group
    Print ISSN: 1755-4330
    Electronic ISSN: 1755-4349
    Topics: Chemistry and Pharmacology
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  • 35
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    Nature Publishing Group
    Online: 1.1998 – 20.2017
    Publisher: Nature Publishing Group
    Print ISSN: 1097-6256
    Electronic ISSN: 1546-1726
    Topics: Biology , Medicine
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  • 36
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    Nature Publishing Group
    Online: 1.2002 –
    Publisher: Nature Publishing Group
    Print ISSN: 1474-1776
    Electronic ISSN: 1474-1784
    Topics: Chemistry and Pharmacology , Medicine
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  • 37
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    Nature Publishing Group
    Online: 1.2016 –
    Publisher: Nature Publishing Group
    Electronic ISSN: 2058-8437
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 38
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    Nature Publishing Group
    Online: 1.1994 –
    Formerly as: Nature Structural Biology  (1994–2003)
    Publisher: Nature Publishing Group
    Print ISSN: 1072-8368 , 1545-9993
    Electronic ISSN: 1072-8368 , 1545-9985
    Topics: Biology , Medicine
    Acronym: NSMB
    Abbreviation: Nat Struct Mol Biol
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  • 39
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    Nature Publishing Group | Shanghai Institute of Ceramics of the Chinese Academy of Sciences
    Online: 2015 –
    Publisher: Nature Publishing Group , Shanghai Institute of Ceramics of the Chinese Academy of Sciences
    Electronic ISSN: 2057-3960
    Topics: Computer Science , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 40
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    Nature Publishing Group
    Online: 2015 –
    Publisher: Nature Publishing Group
    Electronic ISSN: 2373-8065
    Topics: Physics
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  • 41
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    Nature Publishing Group
    Online: 4(1).1997 –
    Publisher: Nature Publishing Group
    Print ISSN: 1350-9047
    Electronic ISSN: 1476-5403
    Topics: Biology , Medicine
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  • 42
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    Nature Publishing Group | Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences
    Online: 2015 –
    Publisher: Nature Publishing Group , Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences
    Electronic ISSN: 2056-5968
    Topics: Biology , Medicine
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  • 43
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    Nature Publishing Group | PubMed Central
    Online: 6.1998 – (older than 12 months)
    Publisher: Nature Publishing Group , PubMed Central
    Print ISSN: 1018-4813
    Electronic ISSN: 1476-5438
    Topics: Biology , Medicine
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  • 44
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    Nature Publishing Group
    Online: 6.1998 –
    Publisher: Nature Publishing Group
    Print ISSN: 1018-4813
    Electronic ISSN: 1476-5438
    Topics: Biology , Medicine
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  • 45
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    Nature Publishing Group
    Online: 1.1999 –
    Publisher: Nature Publishing Group
    Print ISSN: 1466-4879
    Electronic ISSN: 1476-5470
    Topics: Biology , Medicine
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  • 46
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    Nature Publishing Group
    Online: 2015 –
    Publisher: Nature Publishing Group
    Electronic ISSN: 2055-5008
    Topics: Biology
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  • 47
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    Nature Publishing Group
    Online: 2015 –
    Publisher: Nature Publishing Group
    Electronic ISSN: 2056-7189
    Topics: Biology
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  • 48
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    Nature Publishing Group
    Online: 1.2001 – (older than 5 years)
    Publisher: Nature Publishing Group
    Print ISSN: 1470-269X
    Electronic ISSN: 1473-1150
    Topics: Chemistry and Pharmacology
    Parallel titles: The Pharmacogenomics Journal
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  • 49
    Journal cover
    Nature Publishing Group
    Online: 2014 –
    Publisher: Nature Publishing Group
    Electronic ISSN: 2052-4463
    Topics: Nature of Science, Research, Systems of Higher Education, Museum Science
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  • 50
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    Nature Publishing Group | Biocentury
    Online: 1.2008 – 7.2014
    Publisher: Nature Publishing Group , Biocentury
    Electronic ISSN: 1945-3477
    Topics: Natural Sciences in General
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  • 51
    Journal cover
    Springer Nature | Nature Publishing Group | PubMed Central
    Online: 1.2011 –
    Publisher: Springer Nature , Nature Publishing Group , PubMed Central
    Electronic ISSN: 2045-2322
    Topics: Natural Sciences in General
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  • 52
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    Shanghai Institute of Cell Biology | Nature Publishing Group
    Online: 1(1).1990 –
    Publisher: Shanghai Institute of Cell Biology , Nature Publishing Group
    Print ISSN: 1001-0602
    Electronic ISSN: 1748-7838
    Topics: Biology , Medicine
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  • 53
    Journal cover
    Nature Publishing Group | ChangChun Institute of Optics, Fine Mechanics, and Physics (CIOMP)
    Online: 1.2012 –
    Publisher: Nature Publishing Group , ChangChun Institute of Optics, Fine Mechanics, and Physics (CIOMP)
    Electronic ISSN: 2047-7538
    Topics: Physics
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  • 54
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    Nature Publishing Group
    Online: 1.2005 –
    Publisher: Nature Publishing Group
    Print ISSN: 1552-4450
    Electronic ISSN: 1552-4469
    Topics: Biology , Chemistry and Pharmacology
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  • 55
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    Nature Publishing Group
    Online: 1.2006 –
    Publisher: Nature Publishing Group
    Print ISSN: 1748-3387
    Electronic ISSN: 1748-3395
    Topics: Physics
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  • 56
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    Nature Publishing Group
    Online: 229.1971 – 246.1973
    Publisher: Nature Publishing Group
    Print ISSN: 0300-8746
    Electronic ISSN: 1476-4687
    Topics: Physics
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  • 57
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    Nature Publishing Group
    Online: 1.1869 –
    Print: 289.1981 – 416.2002 (Location: A43, LZ 5-7 Oben)
    Print: 45.1891 – 234.1971 (Location: A62, MOP)
    Print: 173.1954 – 492.2012 (Location: A17, Kompaktmagazin, 49/1 - 51/1)
    Publisher: Nature Publishing Group
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 58
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    Nature Publishing Group
    Online: 1.2007 – 4(5).2010
    Publisher: Nature Publishing Group
    Electronic ISSN: 1753-9315
    Topics: Geosciences
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  • 59
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    Nature Publishing Group
    Online: 1.2003 –
    Publisher: Nature Publishing Group
    Print ISSN: 1740-1526
    Electronic ISSN: 1740-1534
    Topics: Biology , Medicine
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  • 60
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    Nature Publishing Group
    Online: 2015 –
    Publisher: Nature Publishing Group
    Electronic ISSN: 2056-6387
    Topics: Physics
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  • 61
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    Nature Publishing Group
    Online: 38(1).2006 –
    Publisher: Nature Publishing Group
    Print ISSN: 0032-3896
    Electronic ISSN: 1349-0540
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 62
    Publication Date: 2013-10-07
    Type: epup
    Format: application/pdf
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  • 63
    Publication Date: 2016-11-24
    Description: Carbon capture and storage is promoted as a mitigation method counteracting the increase of atmospheric CO2 levels. However, at this stage, environmental consequences of potential CO2 leakage from sub-seabed storage sites are still largely unknown. In a 3-month-long mesocosm experiment, this study assessed the impact of elevated pCO2 levels (1,500 to 24,400 µatm) on Cerastoderma edule dominated benthic communities from the Baltic Sea. Mortality of C. edule was significantly increased in the highest treatment (24,400 µatm) and exceeded 50%. Furthermore, mortality of small size classes (0-1 cm) was significantly increased in treatment levels ≥6,600 µatm. First signs of external shell dissolution became visible at ≥1,500 µatm, holes were observed at >6,600 µatm. C. edule body condition decreased significantly at all treatment levels (1,500-24,400 µatm). Dominant meiofauna taxa remained unaffected in abundance. Densities of calcifying meiofauna taxa (i.e. Gastropoda and Ostracoda) decreased in high CO2 treatments (>6,600 µatm), while the non - calcifying Gastrotricha significantly increased in abundance at 24,400 µatm. In addition, microbial community composition was altered at the highest pCO2 level. We conclude that strong CO2 leakage can alter benthic infauna community composition at multiple trophic levels, likely due to high mortality of the dominant macrofauna species C. edule.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , NonPeerReviewed
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  • 64
    Publication Date: 2016-05-25
    Description: Salinity is a major factor controlling the distribution of biota in aquatic systems, and most aquatic multicellular organisms are either adapted to life in saltwater or freshwater conditions. Consequently, the saltwater–freshwater mixing zones in coastal or estuarine areas are characterized by limited faunal and floral diversity. Although changes in diversity and decline in species richness in brackish waters is well documented in aquatic ecology, it is unknown to what extent this applies to bacterial communities. Here, we report a first detailed bacterial inventory from vertical profiles of 60 sampling stations distributed along the salinity gradient of the Baltic Sea, one of world's largest brackish water environments, generated using 454 pyrosequencing of partial (400 bp) 16S rRNA genes. Within the salinity gradient, bacterial community composition altered at broad and finer-scale phylogenetic levels. Analogous to faunal communities within brackish conditions, we identified a bacterial brackish water community comprising a diverse combination of freshwater and marine groups, along with populations unique to this environment. As water residence times in the Baltic Sea exceed 3 years, the observed bacterial community cannot be the result of mixing of fresh water and saltwater, but our study represents the first detailed description of an autochthonous brackish microbiome. In contrast to the decline in the diversity of multicellular organisms, reduced bacterial diversity at brackish conditions could not be established. It is possible that the rapid adaptation rate of bacteria has enabled a variety of lineages to fill what for higher organisms remains a challenging and relatively unoccupied ecological niche.
    Type: Article , PeerReviewed
    Format: text
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  • 65
    Publication Date: 2017-12-19
    Description: The symbiotic association of corals and unicellular algae of the genus Symbiodinium in the southern Persian/Arabian Gulf (PAG) display an exceptional heat tolerance, enduring summer peak temperatures of up to 36 °C. As yet, it is not clear whether this resilience is related to the presence of specific symbiont types that are exclusively found in this region. Therefore, we used molecular markers to identify the symbiotic algae of three Porites species along >1000 km of coastline in the PAG and the Gulf of Oman and found that a recently described species, Symbiodinium thermophilum, is integral to coral survival in the southern PAG, the world’s hottest sea. Despite the geographic isolation of the PAG, we discovered that representatives of the S. thermophilum group can also be found in the adjacent Gulf of Oman providing a potential source of thermotolerant symbionts that might facilitate the adaptation of Indian Ocean populations to the higher water temperatures expected for the future. However, corals from the PAG associated with S. thermophilum show strong local adaptation not only to high temperatures but also to the exceptionally high salinity of their habitat. We show that their superior heat tolerance can be lost when these corals are exposed to reduced salinity levels common for oceanic environments elsewhere. Consequently, the salinity prevailing in most reefs outside the PAG might represent a distribution barrier for extreme temperature-tolerant coral/Symbiodinium associations from the PAG.
    Type: Article , PeerReviewed
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  • 66
    Publication Date: 2017-08-21
    Description: The interoceanic transfer of seawater between the Indian Ocean and the Atlantic, ‘Agulhas leakage’, forms a choke point for the overturning circulation in the global ocean. Here, by combining output from a series of high-resolution ocean and climate models with in situ and satellite observations, we construct a time series of Agulhas leakage for the period 1870–2014. The time series demonstrates the impact of Southern Hemisphere westerlies on decadal timescales. Agulhas leakage shows a correlation with the Atlantic Multi-decadal Oscillation on multi-decadal timescales; the former leading by 15 years. This is relevant for climate in the North Atlantic
    Type: Article , PeerReviewed
    Format: text
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  • 67
    Publication Date: 2017-10-24
    Description: Mesoscale ocean eddies are ubiquitous coherent rotating structures of water with radial scales on the order of 100 kilometers. Eddies play a key role in the transport and mixing of momentum and tracers across the World Ocean. We present a global daily mesoscale ocean eddy dataset that contains ~45 million mesoscale features and 3.3 million eddy trajectories that persist at least two days as identified in the AVISO dataset over a period of 1993–2014. This dataset, along with the open-source eddy identification software, extract eddies with any parameters (minimum size, lifetime, etc.), to study global eddy properties and dynamics, and to empirically estimate the impact eddies have on mass or heat transport. Furthermore, our open-source software may be used to identify mesoscale features in model simulations and compare them to observed features. Finally, this dataset can be used to study the interaction between mesoscale ocean eddies and other components of the Earth System.
    Type: Article , PeerReviewed
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  • 68
    Publication Date: 2017-07-18
    Description: To survey hepatitis B virus (HBV) integration in liver cancer genomes, we conducted massively parallel sequencing of 81 HBV-positive and 7 HBV-negative hepatocellular carcinomas (HCCs) and adjacent normal tissues. We found that HBV integration is observed more frequently in the tumors (86.4%) than in adjacent liver tissues (30.7%). Copy-number variations (CNVs) were significantly increased at HBV breakpoint locations where chromosomal instability was likely induced. Approximately 40% of HBV breakpoints within the HBV genome were located within a 1,800-bp region where the viral enhancer, X gene and core gene are located. We also identified recurrent HBV integration events (in ≥4 HCCs) that were validated by RNA sequencing (RNA-seq) and Sanger sequencing at the known and putative cancer-related TERT, MLL4 and CCNE1 genes, which showed upregulated gene expression in tumor versus normal tissue. We also report evidence that suggests that the number of HBV integrations is associated with patient survival.
    Type: Article , PeerReviewed
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  • 69
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    Nature Publishing Group
    In:  Scientific Reports, 4 (6972).
    Publication Date: 2017-05-09
    Description: Rhodoliths are coralline red algal assemblages that commonly occur in marine habitats from the tropics to polar latitudes. They form rigid structures of high-magnesium calcite and have a good fossil record. Here I show that rhodoliths are ecosystem engineers in a high Arctic environment that increase local biodiversity by providing habitat. Gouged by boring mussels, originally solid rhodoliths become hollow ecospheres intensely colonised by benthic organisms. In the examined shelf areas, biodiversity in rhodolith-bearing habitats is significantly greater than in habitats without rhodoliths and hollow rhodoliths yield a greater biodiversity than solid ones. This biodiversity, however, is threatened because hollow rhodoliths take a long time to form and are susceptible to global change and anthropogenic impacts such as trawl net fisheries that can destroy hollow rhodoliths. Rhodoliths and other forms of coralline red algae play a key role in a plurality of environments and need improved management and protection plans.
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    Publication Date: 2017-09-07
    Description: The core properties of microbial genomes, including GC content and genome size, are known to vary widely among different bacteria and archaea1,2. Several hypotheses have been proposed to explain this genomic variability, but the fundamental drivers that shape bacterial and archaeal genomic properties remain uncertain3,4,5,6,7. Here, we report the existence of a sharp genomic transition zone below the photic zone, where bacterial and archaeal genomes and proteomes undergo a community-wide punctuated shift. Across a narrow range of increasing depth of just tens of metres, diverse microbial clades trend towards larger genome size, higher genomic GC content, and proteins with higher nitrogen but lower carbon content. These community-wide changes in genome features appear to be driven by gradients in the surrounding environmental energy and nutrient fields. Collectively, our data support hypotheses invoking nutrient limitation as a central driver in the evolution of core bacterial and archaeal genomic and proteomic properties.
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  • 71
    Publication Date: 2017-06-13
    Description: Gombapyrones A–D, new members of the α-pyrone family of secondary metabolites, were produced by Streptomyces griseoruber Acta 3662, which was isolated from bamboo tree rhizosphere. The strain was characterized by its morphological and chemotaxonomical features and by 16S rDNA sequencing as S. griseobuber. The gombapyrone structures were determined by mass spectrometry and by NMR experiments, and were found to have an inhibitory activity against protein tyrosine phosphatase 1B and glycogen synthase kinase 3β.
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  • 72
    Publication Date: 2016-11-03
    Description: During the past decades climate and freshwater dynamics in the northwestern North Atlantic have undergone major changes. Large-scale freshening episodes, related to polar freshwater pulses, have had a strong influence on ocean variability in this climatically important region. However, little is known about variability before 1950, mainly due to the lack of long-term high-resolution marine proxy archives. Here we present the first multidecadal-length records of annually resolved Ba/Ca variations from Northwest Atlantic coralline algae. We observe positive relationships between algal Ba/Ca ratios from two Newfoundland sites and salinity observations back to 1950. Both records capture episodical multi-year freshening events during the 20th century. Variability in algal Ba/Ca is sensitive to freshwater-induced changes in upper ocean stratification, which affect the transport of cold, Ba-enriched deep waters onto the shelf (highly stratified equals less Ba/Ca). Algal Ba/Ca ratios therefore may serve as a new resource for reconstructing past surface ocean freshwater changes.
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  • 73
    Publication Date: 2014-03-11
    Type: Article , PeerReviewed
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  • 74
    Publication Date: 2017-03-09
    Description: Nitrogen fixation, the biological reduction of dinitrogen gas (N2) to ammonium (NH4+), is quantitatively the most important external source of new nitrogen (N) to the open ocean. Classically, the ecological niche of oceanic N2 fixers (diazotrophs) is ascribed to tropical oligotrophic surface waters, often depleted in fixed N, with a diazotrophic community dominated by cyanobacteria. Although this applies for large areas of the ocean, biogeochemical models and phylogenetic studies suggest that the oceanic diazotrophic niche may be much broader than previously considered, resulting in major implications for the global N-budget. Here, we report on the composition, distribution and abundance of nifH, the functional gene marker for N2 fixation. Our results show the presence of eight clades of diazotrophs in the oxygen minimum zone (OMZ) off Peru. Although proteobacterial clades dominated overall, two clusters affiliated to spirochaeta and archaea were identified. N2 fixation was detected within OMZ waters and was stimulated by the addition of organic carbon sources supporting the view that non-phototrophic diazotrophs were actively fixing dinitrogen. The observed co-occurrence of key functional genes for N2 fixation, nitrification, anammox and denitrification suggests that a close spatial coupling of N-input and N-loss processes exists in the OMZ off Peru. The wide distribution of diazotrophs throughout the water column adds to the emerging view that the habitat of marine diazotrophs can be extended to low oxygen/high nitrate areas. Furthermore, our statistical analysis suggests that NO2− and PO43− are the major factors affecting diazotrophic distribution throughout the OMZ. In view of the predicted increase in ocean deoxygenation resulting from global warming, our findings indicate that the importance of OMZs as niches for N2 fixation may increase in the futur
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  • 75
    Publication Date: 2015-01-22
    Description: Permafrost-affected soils of the Siberian Arctic were investigated with regard to identification of nitrite oxidizing bacteria active at low temperature. Analysis of the fatty acid profiles of enrichment cultures grown at 4°C, 10°C and 17°C revealed a pattern that was different from that of known nitrite oxidizers but was similar to fatty acid profiles of Betaproteobacteria. Electron microscopy of two enrichment cultures grown at 10°C showed prevalent cells with a conspicuous ultrastructure. Sequence analysis of the 16S rRNA genes allocated the organisms to a so far uncultivated cluster of the Betaproteobacteria, with Gallionella ferruginea as next related taxonomically described organism. The results demonstrate that a novel genus of chemolithoautotrophic nitrite oxidizing bacteria is present in polygonal tundra soils and can be enriched at low temperatures up to 17°C. Cloned sequences with high sequence similarities were previously reported from mesophilic habitats like activated sludge and therefore an involvement of this taxon in nitrite oxidation in nonarctic habitats is suggested. The presented culture will provide an opportunity to correlate nitrification with nonidentified environmental clones in moderate habitats and give insights into mechanisms of cold adaptation. We propose provisional classification of the novel nitrite oxidizing bacterium as 'Candidatus Nitrotoga arctica'.
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  • 76
    Publication Date: 2017-12-19
    Description: Global warming was reported to cause growth reductions in tropical shallow water corals in both, cooler and warmer, regions of the coral species range. This suggests regional adaptation with less heat-tolerant populations in cooler and more thermo-tolerant populations in warmer regions. Here, we investigated seasonal changes in the in situ metabolic performance of the widely distributed hermatypic coral Pocillopora verrucosa along 12 degrees latitudes featuring a steep temperature gradient between the northern (28.5 degrees N, 21-27 degrees C) and southern (16.5 degrees N, 28-33 degrees C) reaches of the Red Sea. Surprisingly, we found little indication for regional adaptation, but strong indications for high phenotypic plasticity: Calcification rates in two seasons (winter, summer) were found to be highest at 28-29 degrees C throughout all populations independent of their geographic location. Mucus release increased with temperature and nutrient supply, both being highest in the south. Genetic characterization of the coral host revealed low inter-regional variation and differences in the Symbiodinium clade composition only at the most northern and most southern region. This suggests variable acclimatization potential to ocean warming of coral populations across the Red Sea: high acclimatization potential in northern populations, but limited ability to cope with ocean warming in southern populations already existing at the upper thermal margin for corals
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  • 77
    Publication Date: 2017-12-19
    Description: The stomachs of most vertebrates operate at an acidic pH of 2 generated by the gastric H+/K+-ATPase located in parietal cells. The acidic pH in stomachs of vertebrates is believed to aid digestion and to protect against environmental pathogens. Little attention has been placed on whether acidic gastric pH regulation is a vertebrate character or a deuterostome ancestral trait. Here, we report alkaline conditions up to pH 10.5 in the larval digestive systems of ambulacraria (echinoderm + hemichordate), the closest relative of the chordate. Microelectrode measurements in combination with specific inhibitors for acid-base transporters and ion pumps demonstrated that the gastric alkalization machinery in sea urchin larvae is mainly based on direct H+ secretion from the stomach lumen and involves a conserved set of ion pumps and transporters. Hemichordate larvae additionally utilized HCO 3- transport pathways to generate even more alkaline digestive conditions. Molecular analyses in combination with acidification experiments supported these findings and identified genes coding for ion pumps energizing gastric alkalization. Given that insect larval guts were also reported to be alkaline, our discovery raises the hypothesis that the bilaterian ancestor utilized alkaline digestive system while the vertebrate lineage has evolved a strategy to strongly acidify their stomachs.
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  • 78
    Publication Date: 2015-07-16
    Description: Symbiotic relationships between phytoplankton and N-2-fixing microorganisms play a crucial role in marine ecosystems. The abundant and widespread unicellular cyanobacteria group A (UCYN-A) has recently been found to live symbiotically with a haptophyte. Here, we investigated the effect of nitrogen (N), phosphorus (P), iron (Fe) and Saharan dust additions on nitrogen (N-2) fixation and primary production by the UCYN-A-haptophyte association in the subtropical eastern North Atlantic Ocean using nifH expression analysis and stable isotope incubations combined with single-cell measurements. N-2 fixation by UCYN-A was stimulated by the addition of Fe and Saharan dust, although this was not reflected in the nifH expression. CO2 fixation by the haptophyte was stimulated by the addition of ammonium nitrate as well as Fe and Saharan dust. Intriguingly, the single-cell analysis using nanometer scale secondary ion mass spectrometry indicates that the increased CO2 fixation by the haptophyte in treatments without added fixed N is likely an indirect result of the positive effect of Fe and/or P on UCYN-A N-2 fixation and the transfer of N-2-derived N to the haptophyte. Our results reveal a direct linkage between the marine carbon and nitrogen cycles that is fuelled by the atmospheric deposition of dust. The comparison of single-cell rates suggests a tight coupling of nitrogen and carbon transfer that stays balanced even under changing nutrient regimes. However, it appears that the transfer of carbon from the haptophyte to UCYN-A requires a transfer of nitrogen from UCYN-A. This tight coupling indicates an obligate symbiosis of this globally important diazotrophic association.
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  • 79
    Publication Date: 2017-12-19
    Description: Coexisting bacteria form various microbial communities in human body parts. In these ecosystems they interact in various ways and the properties of the interaction network can be related to the stability and functional diversity of the local bacterial community. In this study, we analyze the interaction network among bacterial OTUs in 11 locations of the human body. These belong to two major groups. One is the digestive system and the other is the female genital tract. In each local ecosystem we determine the key species, both the ones being in key positions in the interaction network and the ones that dominate by frequency. Beyond identifying the key players and discussing their biological relevance, we also quantify and compare the properties of the 11 networks. The interaction networks of the female genital system and the digestive system show totally different architecture. Both the topological properties and the identity of the key groups differ. Key groups represent four phyla of prokaryotes. Some groups appear in key positions in several locations, while others are assigned only to a single body part. The key groups of the digestive and the genital tracts are totally different.
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  • 80
    Publication Date: 2016-11-03
    Description: Cold-water corals (CWC) are widely distributed around the world forming extensive reefs at par with tropical coral reefs. They are hotspots of biodiversity and organic matter processing in the world’s deep oceans. Living in the dark they lack photosynthetic symbionts and are therefore considered to depend entirely on the limited flux of organic resources from the surface ocean. While symbiotic relations in tropical corals are known to be key to their survival in oligotrophic conditions, the full metabolic capacity of CWC has yet to be revealed. Here we report isotope tracer evidence for efficient nitrogen recycling, including nitrogen assimilation, regeneration, nitrification and denitrification. Moreover, we also discovered chemoautotrophy and nitrogen fixation in CWC and transfer of fixed nitrogen and inorganic carbon into bulk coral tissue and tissue compounds (fatty acids and amino acids). This unrecognized yet versatile metabolic machinery of CWC conserves precious limiting resources and provides access to new nitrogen and organic carbon resources that may be essential for CWC to survive in the resource-depleted dark ocean.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
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  • 81
    Publication Date: 2017-05-04
    Description: Tropopause temperatures (TPTs) control the amount of stratospheric water vapour, which influences chemistry, radiation and circulation in the stratosphere, and is also an important driver of surface climate. Decadal variability and long-term trends in tropical TPTs as well as stratospheric water vapour are largely unknown. Here, we present for the first time evidence, from reanalysis and state-of-the-art climate model simulations, of a link between decadal variability in tropical TPTs and the Pacific Decadal Oscillation (PDO). The negative phase of the PDO is associated with anomalously cold sea surface temperatures (SSTs) in the tropical east and central Pacific, which enhance the zonal SST gradient across the equatorial Pacific. The latter drives a stronger Walker Circulation and a weaker Hadley Circulation, which leads to less convection and subsequently a warmer tropopause over the central equatorial Pacific. Over the North Pacific, positive sea level pressure anomalies occur, which damp vertical wave propagation into the stratosphere. This in turn slows the Brewer-Dobson circulation, and hence warms the tropical tropopause, enabling more water vapour to enter the stratosphere. The reverse chain of events holds for the positive phase of the PDO. Such ocean-troposphere-stratosphere interactions may provide an important feedback on the Earth’s global surface temperature.
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  • 82
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    Nature Publishing Group
    In:  The ISME Journal, 6 (8). pp. 1526-1534.
    Publication Date: 2016-04-29
    Description: The microenvironmental dynamics of the microbial mat of black band disease (BBD) and its less virulent precursor, cyanobacterial patch (CP), were extensively profiled using microsensors under different light intensities with respect to O(2), pH and H(2)S. BBD mats exhibited vertical stratification into an upper phototrophic and lower anoxic and sulphidic zone. At the progression front of BBD lesions, high sulphide levels up to 4977 μM were measured in darkness along with lower than ambient levels of pH (7.43±0.20). At the base of the coral-BBD microbial mat, conditions were hypoxic or anoxic depending on light intensity exposure. In contrast, CP mats did not exhibit strong microchemical stratification with mostly supersaturated oxygen conditions throughout the mats at all light intensities and with levels of pH generally higher than in BBD. Two of three replicate CP mats were devoid of sulphide, while the third replicate showed only low levels of sulphide (up to 42 μM) present in darkness and at intermediate light levels. The level of oxygenation and sulphide correlated well with lesion migration rates, that is virulence of the mats, which were greater in BBD than in CP. The results suggest that biogeochemical microgradients of BBD shaped by the complex microbial community, rather than a defined pathogen, are the major trigger for high virulence and the associated derived coral mortality of this disease.
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