Facies characterisation of sediments from the East Frisian Wadden Sea (Germany): new insights from down-core scanning techniques

Abstract Sediment facies provide fundamental information to interpret palaeoenvironments, climatic variation, archaeological aspects and natural resource potentials since they are summary products of depositional processes, environmental conditions and biological activities for a given time and location. The conventional method of facies discrimination relies on macroscopic and/or microscopic determination of sediment structures combined with basic physical, chemical and biological information. It is a qualitative measure, depending on observer-dependent sedimentological descriptions, which cannot be reanalysed readily by further studies. Quantitative laboratory measurements can overcome this disadvantage, but are in need of large sample numbers and/or high temporal resolution, and are time-, labour- and cost-intensive. In order to facilitate an observer-independent and efficient method of facies classification, our study evaluates the potential of combining four non-destructive down-core scanning techniques: magnetic susceptibility (MS), X-ray computed tomography (CT), X-ray fluorescence (XRF) and digital photography. These techniques were applied on selected sections of sediment cores recovered around the island of Norderney (East Frisian Wadden Sea, Germany). We process and integrate the acquired scanning measurements of XRF elemental intensities, represented by principal components, MS, CT density and lightness of eight sediment facies previously recognised by conventional facies analysis: moraine, eolian/fluvial, soil, peat, lagoonal, sand flat, channel fill and beach-foreshore. A novel type of density plot is introduced to visualise the digitised sediment information that allows an observer-independent differentiation of these facies types. Thus, the presented methodology provides the first step towards automated supervised facies classification with the potential to reproduce human assessments in a fully reproducible and quantitative manner.

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Monoalkylated barbiturate derivatives: X-ray crystal structure, theoretical studies, and biological activities

Journal of Molecular Structure ◽

10.1016/j.molstruc.2017.04.017 ◽

2017 ◽

Vol 1141 ◽

pp. 624-633 ◽

Cited By ~ 5

Author(s):

Assem Barakat ◽

Abdullah Mohammed Al-Majid ◽

Saied M. Soliman ◽

Mohammad Shahidul Islam ◽

Hussain Mansur Ghawas ◽

...

Keyword(s):

Crystal Structure ◽

Biological Activities ◽

Theoretical Studies ◽

X Ray

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A new device to mount portable energy-dispersive X-ray fluorescence spectrometers (p-ED-XRF) for semi-continuous analyses of split (sediment) cores and solid samples

Geoscientific Instrumentation Methods and Data Systems ◽

10.5194/gi-6-93-2017 ◽

2017 ◽

Vol 6 (1) ◽

pp. 93-101 ◽

Cited By ~ 4

Author(s):

Philipp Hoelzmann ◽

Torsten Klein ◽

Frank Kutz ◽

Brigitta Schütt

Keyword(s):

Spatial Resolution ◽

Atlantic Coast ◽

Sediment Cores ◽

Ccd Camera ◽

Energy Dispersive ◽

Solid Samples ◽

Industrial Property ◽

X Ray ◽

New Device ◽

Sample Chamber

Abstract. Portable energy-dispersive X-ray fluorescence spectrometers (p-ED-XRF) have become increasingly popular in sedimentary laboratories to quantify the chemical composition of a range of materials such as sediments, soils, solid samples, and artefacts. Here, we introduce a low-cost, clearly arranged unit that functions as a sample chamber (German industrial property rights no. 20 2014 106 048.0) for p-ED-XRF devices to facilitate economic, non-destructive, fast, and semi-continuous analysis of (sediment) cores or other solid samples. The spatial resolution of the measurements is limited to the specifications of the applied p-ED-XRF device – in our case a Thermo Scientific Niton XL3t p-ED-XRF spectrometer with a maximum spatial resolution of 0.3 cm and equipped with a charge-coupled device (CCD) camera to document the measurement spot. We demonstrate the strength of combining p-ED-XRF analyses with this new sample chamber to identify Holocene facies changes (e.g. marine vs. terrestrial sedimentary facies) using a sediment core from an estuarine environment in the context of a geoarchaeological investigation at the Atlantic coast of southern Spain.

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Synthesis, characterization, x-ray diffraction studies and biological activities of iron(III) and cobalt(II) complexes with alanine

International Journal of Advanced Chemistry ◽

10.14419/ijac.v6i2.13107 ◽

2018 ◽

Vol 6 (2) ◽

pp. 132

Author(s):

Shuaibu Musa ◽

S O. Idris ◽

A D. Onu

Keyword(s):

Amino Acid ◽

Biological Activities ◽

Human Life ◽

Molar Conductance ◽

Biological Molecules ◽

X Ray Diffraction ◽

Monoclinic Crystal ◽

X Ray ◽

Metal Ligands ◽

Elemental Analyses

The resulted complexes produced between Fe (III) and Co (II) with biological molecules like amino acids play an important role in human life. They can be used as bioactive compounds as well as in industries. Fe (III) and Co (II) complexes are synthesized with Alanine amino acid. The complexes were characterized by X-ray diffraction, magnetic suscetivility, elemental analysis (AAS), molar conductance, melting point, infrared and uv-visible spectrophotometry analyses. The elemental analyses were used to determine the chelation ratio, 1:3(metal: ligands) for iron (III) Alanine and 1:2 ratio for cobalt (II) Alanine. The molar conductivity of the complexes show that the complexes are not electrolytic in nature. The x-ray data suggest monoclinic crystal system for all the complexes with the exception of Co-alanine, which is hexagonal. The magnetic susceptivility and electronic spectra suggest the complexes are high spin with octahedral geometry.The complexes show enhance activity in comparable to the amino acid.

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The Variation Effect of Mg-doped NPs Prepared by Sol-Gel Method on its Structural Properties and Biological Activities

Journal of Physics Conference Series ◽

10.1088/1742-6596/2114/1/012004 ◽

2021 ◽

Vol 2114 (1) ◽

pp. 012004

Author(s):

Duha S. Ahmed ◽

Noor Q. Ali ◽

Ali A. Taha

Keyword(s):

Biological Activities ◽

Sol Gel ◽

Spherical Particles ◽

X Ray Diffraction ◽

Gel Method ◽

X Ray ◽

Sol Gel Method ◽

Nio Nps ◽

Dopant Element ◽

Mg Doped

Abstract In this paper, we reported the synthesis of NiO NPs and Mg doped-NiO NPs using the facile sol-gel method. Besides, the influence of the variation of Mg dopant on the structural, morphological and optical properties of the prepared Mg-NiO NPs was studied. The synthesized Mg-NiO NPs nanoparticles were characterized by X-Ray Diffraction Analysis (XRD), Energy Dispersive X-ray Spectroscopy (EDS), Fourier-Transform Infrared Spectroscopy (FTIR), Field-Emission Scanning Electron Microscopy (FE-SEM), and UV-Vis spectrophotometer. The X-ray diffraction confirmed the formation of the cubic structure of Mg doped-NiO NPs after doping with the magnesium. The increase in the crystal size was observed with the increase in the concentration of the Mg dopant element. The FESEM images reveal the formation of nickel oxide through the appearance of spherical clusters, while the hybrids appear as wrinkled surface covered with spherical particles of magnesium. The UV-Vis spectrum showed a shift towards shorter wavelengths with an increase in the concentration of the Mg dopant element due to the quantum confinement effect. The hemolysis activity study showed that NiO NPs had a low hemolysis percentage of 1.47% and increased with increasing concentration. While, increasing of the RBC hemolysis (5.9%) after NiO doped with Mg. The antibacterial activity was studied against S. aureus and P. aeruginosa bacteria, and indicated the highest growth inhibition zones of Mg-doped NiO NPs as compared with NiO NPs against of Staphylococcus aureus and Pseudomonas aeruginosa, respectively.

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Supplementary material to "A new device to mount portable energy dispersive X-ray fluorescence spectrometers (p-ED-XRF) for semi-continuous analyses of split (sediment) cores and solid samples"

10.5194/gi-2016-33-supplement ◽

2016 ◽

Author(s):

Philipp Hoelzmann ◽

Torsten Klein ◽

Frank Kutz ◽

Brigitta Schütt

Keyword(s):

Sediment Cores ◽

Energy Dispersive ◽

Solid Samples ◽

X Ray ◽

New Device ◽

Supplementary Material

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Palaeogeography and Palaeoenvironments – A Multifield Examination of the Devonian-Permian Evolution of the Dneipr-Donets Basin

10.2118/208500-ms ◽

2021 ◽

Author(s):

Christopher James Banks ◽

Bohdan Bodnaruk ◽

Vladislav Kalmutskyi ◽

Yerlan Seilov ◽

Murat Zhiyenkulov ◽

...

Keyword(s):

Pore Space ◽

Donets Basin ◽

Lower Permian ◽

Facies Classification ◽

Potential Development ◽

Sedimentary Architecture ◽

Basin Floor ◽

Facies Types ◽

Architecture Development ◽

Thermal Subsidence

Abstract Context is everything. Not all thick sands pay out and not all thin sands are poorly productive. It is important to understand a basin's palaeogeographical drivers, the resultant palaeoenvironments and their constituent sedimentary architecture. Development of a depositional model can be predictive with respect to the magnitude of accessible pore space for potential development. We present a multi-field study of the Dneipr-Donets basin. Over 600 wells were studied with >4500 lithostratigraphical picks being made. Over 7500 sedimentological picks were made allowing mapping of facies bodies and charting shifts in facies types. A facies classification scheme was developed and applied. The Devonian-Permian sedimentary section records the creation, fill, and terminal closure of the Dneipr-Donets Basin:Syn-rift brittle extension (late Frasnian-Famennian): intracratonic rifting between the Ukrainian Shield and Voronezh Massif formed a NW-SE orientated trough, with associated basaltic extrusion. Basin architecture consists of rotated fault blocks forming graben mini-basins. Sedimentation is dominantly upper shoreface but sand packages are poorly correlatable due to the faulted palaeotopography.Early Post-rift thermal subsidence (Visean-Lower Bashkirian): the faulted palaeotopography was filled and thermal subsidence drove basin deepening. Cyclical successions of offshore, lower shoreface and upper shoreface dominate. Sands are typically thin (<10m) but can be widely correlated and have high pore space connectivity.Mid Post-rift: the Bashkirian (C22/C23 boundary), paralic systems prograde over the shoreface. Changes in vertical facies are abrupt due to a low gradient to basin floor. Deltaic and fluvial facies can produce thick amalgamated sands (>30m), but access limited pore space because they are laterally restricted bodies.Terminal post-rift (Mykytivskan): above the lower Permian, the convergence of the Kazahkstanian and Siberian continents began to restrict the Dnieper-Donets basin's access to open ocean. The basin approached full conditions and deposition was dominated by evaporite precipitation, with periodic oceanic recharge. Ultimately, this sediment records the formation of Pangea. The successions examined were used to construct a basinal relative sea level curve, which can be applied elsewhere in the basin. This can be used to help provide palaeogeographical context to a field, which in turn controls the sedimentary architecture.

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Suitability of calibrated X-ray fluorescence core scanning for environmental geochemical characterisation of heterogeneous sediment cores

Applied Geochemistry ◽

10.1016/j.apgeochem.2020.104824 ◽

2020 ◽

pp. 104824

Author(s):

Tatiana Goldberg ◽

Rick Hennekam ◽

Laura Wasch ◽

Gert-Jan Reichart ◽

Oliver Rach ◽

...

Keyword(s):

Sediment Cores ◽

X Ray

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Discovery of Stealthin Derivatives and Implication of the Amidotransferase FlsN3 in the Biosynthesis of Nitrogen-Containing Fluostatins

Marine Drugs ◽

10.3390/md17030150 ◽

2019 ◽

Vol 17 (3) ◽

pp. 150 ◽

Cited By ~ 2

Author(s):

Chunshuai Huang ◽

Chunfang Yang ◽

Zhuangjie Fang ◽

Liping Zhang ◽

Wenjun Zhang ◽

...

Keyword(s):

Spectroscopic Data ◽

Bioinformatics Analysis ◽

Biological Activities ◽

Side Chain ◽

X Ray Diffraction ◽

X Ray ◽

Aromatic Polyketides ◽

Plausible Mechanism ◽

Encoding Gene

Diazobenzofluorene-containing atypical angucyclines exhibit promising biological activities. Here we report the inactivation of an amidotransferase-encoding gene flsN3 in Micromonospora rosaria SCSIO N160, a producer of fluostatins. Bioinformatics analysis indicated that FlsN3 was involved in the diazo formation. Chemical investigation of the flsN3-inactivation mutant resulted in the isolation of a variety of angucycline aromatic polyketides, including four racemic aminobenzo[b]fluorenes stealthins D–G (9–12) harboring a stealthin C-like core skeleton with an acetone or butanone-like side chain. Their structures were elucidated on the basis of nuclear magnetic resonance (NMR) spectroscopic data and X-ray diffraction analysis. A plausible mechanism for the formation of stealthins D–G (9–12) was proposed. These results suggested a functional role of FlsN3 in the formation/modification of N–N bond-containing fluostatins.

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