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

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

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

Calcium carbonates: induced biomineralization with controlled macromorphology

Abstract (Expand)

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

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

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