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Institution

University of Hohenheim

EducationStuttgart, Germany
About: University of Hohenheim is a education organization based out in Stuttgart, Germany. It is known for research contribution in the topics: Population & Soil water. The organization has 8585 authors who have published 16406 publications receiving 567377 citations.


Papers
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Journal ArticleDOI
TL;DR: This paper marks the first report on HPLC-DAD/ESI-MSn investigations of phenolic compounds in dandelion and reveals that even more quercetin glycosides were found in dandalion than hitherto assumed.
Abstract: Phenolic acids and flavonoids were extracted from a dandelion (Taraxacum officinale WEB. ex WIGG.) root and herb juice and characterized by high-performance liquid chromatography/electrospray ionization mass spectrometry. Among the 43 compounds detected, 5 mono- and dicaffeoylquinic acids, 5 tartaric acid derivatives, 8 flavone and 8 flavonol glycosides were characterized based on their UV spectra and their fragmentation patterns in collision-induced dissociation experiments. The predominant compound was chicoric acid (dicaffeoyltartaric acid). Furthermore, several caffeoylquinic acid isomers were distinguished in dandelion extracts for the first time by their specific mass spectral data. The present study reveals that even more quercetin glycosides were found in dandelion than hitherto assumed. The occurrence of di- and triglycosylated flavonoids in particular has not yet been described. This paper marks the first report on HPLC-DAD/ESI-MSn investigations of phenolic compounds in dandelion.

195 citations

Journal ArticleDOI
TL;DR: The results demonstrate that the maintenance of rat and chicken endothelial barrier function depends on the brain microenvironment, and the alteration of tight junctions is different in rat and Chicken, implying that the rat andChicken brain endothelial tight junitions are regulated differently.

195 citations

Journal ArticleDOI
TL;DR: In this article, a tree-ring-based radiocarbon record is reconciled with simulated production rates and carbon-cycle changes associated with reduced ocean ventilation during the Younger Dryas.
Abstract: The Younger Dryas interval during the Last Glacial Termination was an abrupt return to glacial-like conditions punctuating the transition to a warmer, interglacial climate. Despite recent advances in the layer counting of ice-core records of the termination, the timing and length of the Younger Dryas remain controversial. Also, a steep rise in the concentration of atmospheric radiocarbon at the onset of the interval, recorded primarily in the Cariaco Basin, has been difficult to reconcile with simulations of the Younger Dryas carbon cycle. Here we discuss a radiocarbon chronology from a tree-ring record covering the Late Glacial period that has not been absolutely dated. We correlate the chronology to ice-core timescales using the common cosmic production signal in tree-ring 14C and ice-core 10Be concentrations. The results of this correlation suggest that the Cariaco record may be biased by changes in the concentration of radiocarbon in the upper ocean during the early phase of the Younger Dryas climate reversal in the Cariaco basin. This bias in the marine record may also affect the accuracy of a widely used radiocarbon calibration curve over this interval. Our tree-ring-based radiocarbon record is easily reconciled with simulated production rates and carbon-cycle changes associated with reduced ocean ventilation during the Younger Dryas. Attaching a ‘floating’ tree-ring chronology to ice core records that cover the abrupt Younger Dryas cold interval during the last glacial termination provides a better estimate of the onset and duration of the radiocarbon anomaly. The chronology suggests that marine records may be biased by changes in the concentration of radiocarbon in the ocean, which may affect the accuracy of a popular radiocarbon calibration program during this interval.

194 citations

Journal ArticleDOI
01 Dec 2001-Geology
TL;DR: Early Holocene lacustrine, tree-ring, ice-core, and marine records reveal that the Northern Hemisphere underwent a short cooling event at 10 300 calendar yr B.P. as mentioned in this paper.
Abstract: Early Holocene lacustrine, tree-ring, ice-core, and marine records reveal that the Northern Hemisphere underwent a short cooling event at 10 300 calendar yr B.P. (9100 14 C yr B.P.). The records were compared on a common high-resolution time scale and show that the event lasted less than 200 yr, with a cooling peak of 50 yr, and the event coincides with a distinct Holocene thermohaline disturbance recognized in the North Atlantic Ocean. In spite of wellknown freshwater forcings at the time of the event, the negligible difference between the modeled D 14 C record, based on the GISP2 (Greenland Ice Sheet Project 2) 10 Be data, and the measured values, does not allow for detectable D 14 C changes related to global ocean ventilation. We can, however, show that the onset of the cooling coincides with the onset of one of the largest Holocene 10 Be flux peaks. This finding may imply that the climate system is more

194 citations

Journal ArticleDOI
TL;DR: Investigation of the binding properties and specificity of PBPs from Mamestra brassicae, Antheraea polyphemus, Bombyx mori, and a hexa-mutant of MbraPBP1, indicates that relatively limited modifications to the PBP cavity actually interfere with AMA binding, suggesting that AMA binds in the internal cavity.

193 citations


Authors

Showing all 8665 results

NameH-indexPapersCitations
Robert J. Lefkowitz214860147995
Patrick O. Brown183755200985
Mark Stitt13245660800
Wolf B. Frommer10534530918
Muhammad Imran94305351728
Muhammad Farooq92134137533
Yakov Kuzyakov8766737050
Werner Goebel8536726106
Ismail Cakmak8424925991
Reinhold Carle8441824858
Michael Wink8393832658
Albrecht E. Melchinger8339823140
Tilman Grune8247930327
Volker Römheld7923120763
Klaus Becker7932027494
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
202344
2022161
20211,045
2020954
2019868
2018802