TY  - GEN
A1  - Frimmel, Fritz Hartmann
A1  - Kumke, Michael Uwe
T1  - Optische Parameter zur Stoffcharakterisierung vom Trinkwasser bis zum Abwasser
N2  - Die Anwendung von optischen Parametern zur Stoffcharakterisierung wird diskutiert. Dabei ist der Schwerpunkt der Diskussion auf absorptions- und fluoreszenzspektroskopische Methoden gesetzt. Beide Methoden können schnell und zuverlässig – auch im on-line Betrieb – eingesetzt werden. Der Beitrag soll einen Überblick über die grundlegenden Möglichkeiten der Anwendung beider Methoden geben.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - paper 025 
KW  - Absorptionsspektroskopie
KW  - SAK
KW  - Fluoreszenzspektroskopie
KW  - Summenparameter
KW  - Huminstoffe
KW  - polyzyklische aromatische Kohlenwasserstoffe
Y1  - 1998
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-13088
ER  - 
TY  - GEN
A1  - Kumke, Michael Uwe
A1  - Frimmel, Fritz Hartmann
T1  - Stationary and time-resolved fluorescence for humic substances characterization
N2  - Steady-state and time-resolved fluorescence methods were applied to investigate the fluorescence properties of humic substances of different origins. Using standard 2D emission and total luminescence spectra, fluorescence maxima, the width of the fluorescence band and a relative fluorescence quantum efficiency were determined. Different trends for fulvic acids and humic acids were observed indicating differences in the heterogeneity of the sample fractions. The complexity of the fluorescence decay of humic substances is discussed and compared to simple model compounds. The effect of oxidation of humic substances on their fluorescence properties is discussed as well.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - paper 014 
Y1  - 2002
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-12353
ER  - 
TY  - JOUR
A1  - Kehlmaier, Christian
A1  - Barlow, Axel
A1  - Hastings, Alexander K.
A1  - Vamberger, Melita
A1  - Paijmans, Johanna L. A.
A1  - Steadman, David W.
A1  - Albury, Nancy A.
A1  - Franz, Richard
A1  - Hofreiter, Michael
A1  - Fritz, Uwe
T1  - Tropical ancient DNA reveals relationships of the extinct bahamian giant tortoise Chelonoidis alburyorum
JF  - Proceedings of the Royal Society of London : Series B, Biological sciences
N2  - Ancient DNA of extinct species from the Pleistocene and Holocene has provided valuable evolutionary insights. However, these are largely restricted to mammals and high latitudes because DNA preservation in warm climates is typically poor. In the tropics and subtropics, non-avian reptiles constitute a significant part of the fauna and little is known about the genetics of the many extinct reptiles from tropical islands. We have reconstructed the near-complete mitochondrial genome of an extinct giant tortoise from the Bahamas (Chelonoidis alburyorum) using an approximately 1000-year-old humerus from a water-filled sinkhole (blue hole) on Great Abaco Island. Phylogenetic and molecular clock analyses place this extinct species as closely related to Galapagos (C. niger complex) and Chaco tortoises (C. chilensis), and provide evidence for repeated overseas dispersal in this tortoise group. The ancestors of extant Chelonoidis species arrived in South America from Africa only after the opening of the Atlantic Ocean and dispersed from there to the Caribbean and the Galapagos Islands. Our results also suggest that the anoxic, thermally buffered environment of blue holes may enhance DNA preservation, and thus are opening a window for better understanding evolution and population history of extinct tropical species, which would likely still exist without human impact.
KW  - Bahamas
KW  - biogeography
KW  - extinction
KW  - palaeontology
KW  - phylogeny
Y1  - 2017
U6  - https://doi.org/10.1098/rspb.2016.2235
SN  - 0962-8452
SN  - 1471-2954
VL  - 284
PB  - The Royal Society
CY  - London
ER  - 
TY  - GEN
A1  - Hoehnel, Desirée
A1  - Tagle, Roald
A1  - Hofmann, Axel
A1  - Reimold, W. U.
A1  - Mohr-Westheide, Tanja
A1  - Fritz, Joerg
A1  - Altenberger, Uwe
T1  - MICRO-XRF ANALYSIS OF ARCHEAN SPHERULE LAYERS AND HOST ROCKS FROM THE CT3 DRILL CORE, BARBERTON GREENSTONE BELT, SOUTH AFRICA
T2  - Monthly notices of the Royal Astronomical Society
Y1  - 2016
SN  - 1086-9379
SN  - 1945-5100
VL  - 51
SP  - A334
EP  - A334
PB  - Wiley-Blackwell
CY  - Hoboken
ER  - 
TY  - JOUR
A1  - Kumke, Michael Uwe
A1  - Specht, C. H.
A1  - Frimmel, Fritz Hartmann
T1  - Characterization of NOM adsorption to clay minerals by sizs exclusion chromatography
Y1  - 2000
ER  - 
TY  - JOUR
A1  - Kumke, Michael Uwe
A1  - Zwiener, Christian
A1  - Abbt-Braun, Gudrun
A1  - Frimmel, Fritz Hartmann
T1  - Spectroscopic characterization of fulvic acid fractions of a contaminated groundwater
Y1  - 2000
ER  - 
TY  - JOUR
A1  - Kumke, Michael Uwe
A1  - Ohlenbusch, G.
A1  - Frimmel, Fritz Hartmann
T1  - Sorption of phenols to dissolved organic matter investigaded by solid phase micriextrakrion
Y1  - 2000
ER  -