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Exposure to iodine, essential and non-essential trace element through seaweed consumption in humans.Scientific Reports Jun 2024Seaweed consumption has gained popularity due to its nutritional value and potential health benefits. However, concerns regarding the bioaccumulation of several trace...
Seaweed consumption has gained popularity due to its nutritional value and potential health benefits. However, concerns regarding the bioaccumulation of several trace elements highlight the need for comprehensive studies on exposure associated with seaweed consumption. To address this gap in knowledge, we carried out a feeding intervention study of three common edible seaweeds (Nori, Kombu, and Wakame) in 11 volunteers, aiming to elucidate the extent of both beneficial and harmful trace element exposure through seaweed consumption in humans. Concentrations of total arsenic, cobalt, copper, cadmium, iodine, molybdenum, selenium, and zinc were measured in urine samples before and following seaweed consumption. Elements concentrations were also measured in the seaweeds provided for the study. Descriptive analysis for each element were conducted and we used quantile g-computation approach to assess the association between the 8-element mixture and seaweed consumption. Differences in urine element concentrations and seaweed consumption were analyzed using generalized estimating equations (GEE). Urinary concentrations of iodine and total arsenic increased after seaweed consumption. When we analyze the 8-element mixture, the largest weight was observed for iodine after Kombu consumption while for total arsenic was observed after Wakame consumption. Similar results were observed when we compared the mean differences between the elements before and after seaweed consumption through the GEE. Seaweed consumption relates with increased urinary iodine and total arsenic concentrations, particularly after Kombu and Wakame consumption.
Topics: Seaweed; Humans; Iodine; Trace Elements; Female; Male; Adult; Arsenic; Middle Aged; Selenium
PubMed: 38871780
DOI: 10.1038/s41598-024-64556-w -
Nanomaterials (Basel, Switzerland) Jun 2024Atomically thin two-dimensional transition metal dichalcogenides (TMDCs) have been regarded as ideal and promising nanomaterials that bring broad application prospects... (Review)
Review
Atomically thin two-dimensional transition metal dichalcogenides (TMDCs) have been regarded as ideal and promising nanomaterials that bring broad application prospects in extensive fields due to their ultrathin layered structure, unique electronic band structure, and multiple spatial phase configurations. TMDCs with different phase structures exhibit great diversities in physical and chemical properties. By regulating the phase structure, their properties would be modified to broaden the application fields. In this mini review, focusing on the most widely concerned molybdenum dichalcogenides (MoX: X = S, Se, Te), we summarized their phase structures and corresponding electronic properties. Particularly, the mechanisms of phase transformation are explained, and the common methods of phase regulation or phase stabilization strategies are systematically reviewed and discussed. We hope the review could provide guidance for the phase regulation of molybdenum dichalcogenides nanomaterials, and further promote their real industrial applications.
PubMed: 38869609
DOI: 10.3390/nano14110984 -
Nanomaterials (Basel, Switzerland) Jun 2024Molybdenum disulfide (MoS), a typical layered material, has important applications in various fields, such as optoelectronics, catalysis, electronic devices, sensors,...
Molybdenum disulfide (MoS), a typical layered material, has important applications in various fields, such as optoelectronics, catalysis, electronic devices, sensors, and supercapacitors. Extensive research has been carried out on few-layered MoS in the field of electrochemistry due to its large specific surface area, abundant active sites and short electron transport path. However, the preparation of few-layered MoS is a significant challenge. This work presents a simple one-pot hydrothermal method for synthesizing few-layered MoS. Furthermore, it investigates the exfoliation effect of different amounts of sodium borohydride (NaBH) as a stripping agent on the layer number of MoS. Na ions, as alkali metal ions, can intercalate between layers to achieve the purpose of exfoliating MoS. Additionally, NaBH exhibits reducibility, which can effectively promote the formation of the metallic phase of MoS. Few-layered MoS, as an electrode for supercapacitor, possesses a wide potential window of 0.9 V, and a high specific capacitance of 150 F g at 1 A g. This work provides a facile method to prepare few-layered two-dimensional materials for high electrochemical performance.
PubMed: 38869593
DOI: 10.3390/nano14110968 -
Nanomaterials (Basel, Switzerland) May 2024This paper presents an application for a molybdenum disulfide nanomaterial with multiwalled carbon nanotubes (MoS@MWCNT/E) in a modified electrode substrate for the...
This paper presents an application for a molybdenum disulfide nanomaterial with multiwalled carbon nanotubes (MoS@MWCNT/E) in a modified electrode substrate for the detection of uric acid (UA). The modified electrode generates a substantial three-fold increase in the anodic peak current for UA compared to the unmodified MWCNT electrode (MWCNT/E). The MoS@MWCNT/E surface was characterized by cyclic voltammetry (CV), scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS) and electrochemical impedance spectroscopy (EIS). The achieved detection limit stood at 0.04 µmol/L, with a relative standard deviation (RSD) of 2.0% (n = 10). The method's accuracy, assessed through relative error and percent recovery, was validated using a urine standard solution spiked with known quantities of UA.
PubMed: 38869583
DOI: 10.3390/nano14110958 -
Science Advances Jun 2024Nitrogenase plays a key role in the global nitrogen cycle; yet, the evolutionary history of nitrogenase and, particularly, the sequence of appearance between the...
Nitrogenase plays a key role in the global nitrogen cycle; yet, the evolutionary history of nitrogenase and, particularly, the sequence of appearance between the homologous, yet distinct NifDK (the catalytic component) and NifEN (the cofactor maturase) of the extant molybdenum nitrogenase, remains elusive. Here, we report the ability of NifEN to reduce N at its surface-exposed L-cluster ([FeSC]), a structural/functional homolog of the M-cluster (or cofactor; [(-homocitrate)MoFeSC]) of NifDK. Furthermore, we demonstrate the ability of the L-cluster-bound NifDK to mimic its NifEN counterpart and enable N reduction. These observations, coupled with phylogenetic, ecological, and mechanistic considerations, lead to the proposal of a NifEN-like, L-cluster-carrying protein as an ancient nitrogenase, the exploration of which could shed crucial light on the evolutionary origin of nitrogenase and related enzymes.
Topics: Nitrogenase; Phylogeny; Nitrogen; Molybdoferredoxin; Models, Molecular; Bacterial Proteins; Nitrogen Fixation
PubMed: 38865457
DOI: 10.1126/sciadv.ado6169 -
Energy & Fuels : An American Chemical... Jun 2024A crucial aspect of adding an economical and environmental dimension to the upgrading of bio-oils is to develop catalysts with enhanced and prolonged activity. In the...
A crucial aspect of adding an economical and environmental dimension to the upgrading of bio-oils is to develop catalysts with enhanced and prolonged activity. In the present study, the effect of doping δ-alumina (AlO) with oxides of cerium (Ce) and lanthanum (La) before thermal treatment was investigated. The performance of such an AlO-supported nickel-molybdenum (Ni-Mo) catalyst was evaluated by studying the selectivity for the direct hydrodeoxygenation (HDO) of vanillin to cresol under continuous-flow conditions. In addition, the effect of adding HS during catalyst activation and/or performance tests was also evaluated. Overall, enhanced performance of the doped NiMo catalyst in the HDO process has been demonstrated and an increased selectivity for cresol via direct HDO observed. The advantage of adding La and Ce is supported by the characterization results, where less sintering and enhanced pore diameter of the doped AlO were observed after thermally inducing the transformation from the δ to θ phases. The improved characteristics and prolonged activity of the doped AlO were also deduced by the lower acidity of the catalyst, which resulted in reduced coke formation during the HDO process.
PubMed: 38863686
DOI: 10.1021/acs.energyfuels.4c00898 -
Optics Express May 2024Two-dimensional molybdenum disulfide (MoS) has been proven to be a candidate in photodetectors, and MoS/lead sulfide (PbS) quantum dots (QDs) heterostructure has been...
Two-dimensional molybdenum disulfide (MoS) has been proven to be a candidate in photodetectors, and MoS/lead sulfide (PbS) quantum dots (QDs) heterostructure has been used to expand the optical response wavelength of MoS. Time-resolved pump-probe transient absorption measurements are performed to clarify the carrier transfer dynamics in the MoS/PbS heterostructure. By comparing the carrier dynamics in MoS and MoS/PbS under different pump wavelengths, we found that the excited electrons in PbS QDs can transfer rapidly (<100 fs) to MoS, inducing its optical response in the near-infrared region, although the pump light energy is lower than the bandgap of MoS. Besides, interfacial excitons can be formed in the heterostructure, prolonging the lifetime of the excited carriers, which could be beneficial for the extraction of the carriers in devices.
PubMed: 38859080
DOI: 10.1364/OE.521726 -
International Journal of Nanomedicine 2024The development of metallic joint prostheses has been ongoing for more than a century alongside advancements in hip and knee arthroplasty. Among the materials utilized,... (Review)
Review
The development of metallic joint prostheses has been ongoing for more than a century alongside advancements in hip and knee arthroplasty. Among the materials utilized, the Cobalt-Chromium-Molybdenum (Co-Cr-Mo) and Titanium-Aluminum-Vanadium (Ti-Al-V) alloys are predominant in joint prosthesis construction, predominantly due to their commendable biocompatibility, mechanical strength, and corrosion resistance. Nonetheless, over time, the physical wear, electrochemical corrosion, and inflammation induced by these alloys that occur post-implantation can cause the release of various metallic components. The released metals can then flow and metabolize in vivo, subsequently causing potential local or systemic harm. This review first details joint prosthesis development and acknowledges the release of prosthetic metals. Second, we outline the metallic concentration, biodistribution, and elimination pathways of the released prosthetic metals. Lastly, we discuss the possible organ, cellular, critical biomolecules, and significant signaling pathway toxicities and adverse effects that arise from exposure to these metals.
Topics: Humans; Animals; Metals; Metal-on-Metal Joint Prostheses; Tissue Distribution; Titanium; Joint Prosthesis; Prosthesis Design; Alloys
PubMed: 38855732
DOI: 10.2147/IJN.S459255 -
ACS Organic & Inorganic Au Jun 2024Molybdenum(III) complexes bearing pincer-type ligands are well-known catalysts for N-to-NH reduction. We investigated herein the impact of an anionic PNP pincer-type...
Molybdenum(III) complexes bearing pincer-type ligands are well-known catalysts for N-to-NH reduction. We investigated herein the impact of an anionic PNP pincer-type ligand in a Mo(III) complex on the (electro)chemical N splitting ([MoCl], , H = 2,6-bis((di--butylphosphaneyl)methyl)-pyridin-4-one). The increased electron-donating properties of the anionic ligand should lead to a stronger degree of N activation. The catalyst is indeed active in N-to-NH conversion utilizing the proton-coupled electron transfer reagent SmI/ethylene glycol. The corresponding Mo(V) nitrido complex exhibits similar catalytic activity as and thus could represent a viable intermediate. The Mo(IV) nitrido complex is also accessible by electrochemical reduction of under a N atmosphere. IR- and UV/vis-SEC measurements suggest that N splitting occurs via formation of an "overreduced" but more stable [((N)Mo)μ-N] dimer. In line with this, the yield in the nitrido complex increases with lower applied potentials.
PubMed: 38855335
DOI: 10.1021/acsorginorgau.3c00056 -
Nanophotonics 2024Hyperbolic phonon polaritons (HPhPs), hybrids of light and lattice vibrations in polar dielectric crystals, empower nanophotonic applications by enabling the confinement...
Hyperbolic phonon polaritons (HPhPs), hybrids of light and lattice vibrations in polar dielectric crystals, empower nanophotonic applications by enabling the confinement and manipulation of light at the nanoscale. Molybdenum trioxide (α-MoO) is a naturally hyperbolic material, meaning that its dielectric function deterministically controls the directional propagation of in-plane HPhPs within its reststrahlen bands. Strategies such as substrate engineering, nano- and heterostructuring, and isotopic enrichment are being developed to alter the intrinsic die ectric functions of natural hyperbolic materials and to control the confinement and propagation of HPhPs. Since isotopic disorder can limit phonon-based processes such as HPhPs, here we synthesize isotopically enriched MoO (Mo: 99.93 %) and MoO (Mo: 99.01 %) crystals to tune the properties and dispersion of HPhPs with respect to natural α-MoO, which is composed of seven stable Mo isotopes. Real-space, near-field maps measured with the photothermal induced resonance (PTIR) technique enable comparisons of inplane HPhPs in α-MoO and isotopically enriched analogues within a reststrahlen band (≈820 cm to ≈ 972 cm). Results show that isotopic enrichment (e.g., MoO and MoO) alters the dielectric function, shifting the HPhP dispersion (HPhP angular wavenumber × thickness vs IR frequency) by ≈-7% and ≈ +9 %, respectively, and changes the HPhP group velocities by ≈ ±12 %, while the lifetimes (≈ 3 ps) in MoO were found to be slightly improved (≈ 20 %). The latter improvement is attributed to a decrease in isotopic disorder. Altogether, isotopic enrichment was found to offer fine control over the properties that determine the anisotropic in-plane propagation of HPhPs in α-MoO, which is essential to its implementation in nanophotonic applications.
PubMed: 38846933
DOI: 10.1515/nanoph-2023-0717