Wolfgang Schmidt-Heck

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About Wolfgang Schmidt-Heck:

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SEEK ID: https://data.chembiosys.de/people/31

Location: Germany

ORCID: Not specified

Joined: 3rd Feb 2015

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Showing 5 out of a possible 19 Projects Advanced Projects list for this Person with search and filtering

Thiopeptide Signals in Actinomycete Communities

Public web page: Not specified

Organisms: Streptomyces coelicolor, Bacillus subtilis, Streptomyces lividans

Metallophores as Mediators for Metal Cycling: Profiling and Ecological Evaluation of Ligands Involved in the Microbial Cycling of Iron in Complex Systems

Public web page: Not specified

Organisms: Shewanella oneidensis, Pseudomonas sp., Sideroxydans sp.

Z01

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Chemical Factors Structuring Gut Microbial Communities of Insects

Public web page: Not specified

Organisms: Verticillium dahliae , Spodoptora littoralis, Clostridium cellulolyticum, Enterococcus mundtii

Stimuli-Responsive Microcapsules for Transport, Controlled Delivery and Release of Metal Ions and Organic

Public web page: Not specified

Organisms: Serpula lacrymans, Paxillus involutus, Aspergillus nidulans

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Leibniz Institute for Natural Product Research and Infection Biology - Hans Knöll Institute

Country: Germany

City: Jena

Web page: http://www.leibniz-hki.de

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Showing 5 out of a possible 84 Publications Advanced Publications list for this Person with search and filtering

Thermodynamic study on 8-hydroxyquinoline-2-carboxylic acid as a chelating agent for iron found in the gut of Noctuid larvae

C5, Z01

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The recognition of quinolinic carboxylic acids as natural chelants and the recent observation of a high production of 8-hydroxyquinoline-2-carboxylic acid (8-HQA) in the gut of several Noctuid larvae … (e.g. Spodoptera littoralis) has inspired the study of the chelation properties of 8-HQA towards Fe2+ and Fe3+. Here, we report a detailed characterization of the thermodynamic solution behaviour of Fe2+/8-HQA and Fe3+/8-HQA systems as a function of the pH value. The acid–base properties of 8-HQA and its binding ability towards Fe2+ and Fe3+ have been investigated over a wide range of pH values (2.0 ≤ pH ≤ 11.0) by ISE-H+ (glass electrode) potentiometric titrations in KCl(aq) at I = 0.2 mol dm−3 and at T = 298.15 K. For both oxidation states, various FeLqHr species are formed, with q = 1, 2 (and 3), and −2 ≤ r ≤ 1. The presence of the main FeLqHr species was confirmed by HESI-HRMS. ESR measurements have also been performed to get some extra information on the Fe3+ coordination, indicating a distorted octahedral symmetry around the metal center. Quantum mechanical calculations have been carried out in order to characterize the structural features of selected metal complexes. The complexing ability of 8-HQA is generally much higher for Fe3+ than Fe2+. Nevertheless, the sequestering ability of 8-HQA towards these two oxidation states of this metal ion, obtained by the calculation of several pL0.5 values, resulted in it being highly dependent on the pH value: (i) at relatively low pH values, it is higher for Fe3+ (pL0.5 = 6.3 at pH = 3.0) than for Fe2+ (pL0.5 = 3.1 at pH = 3.0); (ii) it is almost the same at pH = 8.1 (Fe3+: pL0.5 = 8.3; Fe2+: pL0.5 = 8.1); (iii) it is higher for Fe2+ at high pH values (pL0.5 = 8.9 for Fe2+ and pL0.5 = 6.2 for Fe3+ at pH = 10.0). The determination of the stability constants of the Fe2+/8-HQA and Fe3+/8-HQA complexes was also complemented by data obtained by the ligand-competition approach, using EDTA as a competing ligand over a wide range of cation and ligand concentrations and ratios. This also allowed a more thorough investigation of both the Fe2+/EDTA and Fe3+/EDTA systems, providing an accurate stability constant dataset for the Fep(EDTA)qHr species under the above-mentioned experimental conditions, which are commonly used in biological studies.

Authors: Sofia Gama, Mariachiara Frontauria, Nico Ueberschaar, Giuseppe Brancato, Demetrio Milea, Silvio Sammartano, Winfried Plass

Date Published: 9th Apr 2018

Publication Type: Not specified

DOI: 10.1039/C7NJ04889K

Citation:

Created: 30th May 2018 at 14:04

Views: 1576, Downloads: 0

DeltaMS: a tool to track isotopologues in GC- and LC-MS data

C5, Z01, INF

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Introduction: Stable isotopic labeling experiments are powerful tools to study metabolic pathways, to follow tracers and fluxes in biotic and abiotic transformations and to elucidate molecules involved …

Authors: Tim U. H. Baumeister, Nico Ueberschaar, Wolfgang Schmidt-Heck, J. Frieder Mohr, Michael Deicke, Thomas Wichard, Reinhard Guthke, Georg Pohnert

Date Published: 27th Feb 2018

Publication Type: Not specified

DOI: 10.1007/s11306-018-1336-x

Citation:

Created: 28th Feb 2018 at 12:35

Views: 1460, Downloads: 0

Plant-mediated RNAi silences midgut-expressed genes in congeneric lepidopteran insects in nature.

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BACKGROUND: Plant-mediated RNAi (PMRi) silencing of insect genes has enormous potential for crop protection, but whether it works robustly under field conditions, particularly with lepidopteran pests, …

Authors: S. Poreddy, J. Li, I. T. Baldwin

Date Published: 15th Nov 2017

Publication Type: Not specified

PubMed ID: 29132300

Citation: BMC Plant Biol. 2017 Nov 13;17(1):199. doi: 10.1186/s12870-017-1149-5.

Created: 23rd Nov 2017 at 09:11

Views: 1381, Downloads: 0

Calcium carbonates: induced biomineralization with controlled macromorphology

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Biomineralization of (magnesium) calcite and vaterite by bacterial isolates has been known for quite some time. However, the extracellular precipitation has hardly ever been linked to different …

Authors: Aileen Meier, Anne Kastner, Dennis Harries, Maria Wierzbicka-Wieczorek, Juraj Majzlan, Georg Büchel, Erika Kothe

Date Published: 6th Nov 2017

Publication Type: Not specified

DOI: 10.5194/bg-14-4867-2017

Citation:

Created: 23rd Nov 2017 at 08:52

Views: 1363, Downloads: 0

In Vivo Isotopic Labeling of Symbiotic Bacteria Involved in Cellulose Degradation and Nitrogen Recycling within the Gut of the Forest Cockchafer (Melolontha hippocastani).

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The guts of insects harbor symbiotic bacterial communities. However, due to their complexity, it is challenging to relate a specific symbiotic phylotype to its corresponding function. In the present …

Authors: P. Alonso-Pernas, S. Bartram, E. M. Arias-Cordero, A. L. Novoselov, L. Halty-deLeon, Y. Shao, W. Boland

Date Published: 28th Oct 2017

Publication Type: Not specified

PubMed ID: 29075241

Citation: Front Microbiol. 2017 Oct 12;8:1970. doi: 10.3389/fmicb.2017.01970. eCollection 2017.

Created: 23rd Nov 2017 at 08:38

Views: 1413, Downloads: 0

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