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Journal articles on the topic 'ZZS complex'

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Published: 25 May 2024

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1

Zhang, Qianting, Shu-Yan Ji, Kiran Busayavalasa, and Chao Yu. "SPO16 binds SHOC1 to promote homologous recombination and crossing-over in meiotic prophase I." Science Advances 5, no. 1 (January 2019): eaau9780. http://dx.doi.org/10.1126/sciadv.aau9780.

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Segregation of homologous chromosomes in meiosis I is tightly regulated by their physical links, or crossovers (COs), generated from DNA double-strand breaks (DSBs) through meiotic homologous recombination. In budding yeast, three ZMM (Zip1/2/3/4, Mer3, Msh4/5) proteins, Zip2, Zip4, and Spo16, form a “ZZS” complex, functioning to promote meiotic recombination via a DSB repair pathway. Here, we identified the mammalian ortholog of Spo16, termed SPO16, which interacts with the mammalian ortholog of Zip2 (SHOC1/MZIP2), and whose functions are evolutionarily conserved to promote the formation of COs. SPO16 localizes to the recombination nodules, as SHOC1 and TEX11 do. SPO16 is required for stabilization of SHOC1 and proper localization of other ZMM proteins. The DSBs formed in SPO16-deleted meiocytes were repaired without COs formation, although synapsis is less affected. Therefore, formation of SPO16-SHOC1 complex–associated recombination intermediates is a key step facilitating meiotic recombination that produces COs from yeast to mammals.
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2

Wang, Xue-Zhong, Predrag S. Stanimirović, and Yimin Wei. "Complex ZFs for computing time-varying complex outer inverses." Neurocomputing 275 (January 2018): 983–1001. http://dx.doi.org/10.1016/j.neucom.2017.09.034.

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3

Ernits, K., K. Muska, M. Danilson, J. Raudoja, T. Varema, O. Volobujeva, and M. Altosaar. "Anion Effect of Zinc Source on Chemically Deposited ZnS(O,OH) Films." Advances in Materials Science and Engineering 2009 (2009): 1–5. http://dx.doi.org/10.1155/2009/372708.

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The study on the anion effect of different Zn sources—Zn(CH3COO)2, ZnCl2, ZnI2, Zn(NO3)2and ZnSO4—on the chemical deposition of ZnS(O,OH) films revealed that the growth rate and composition of the ZnS(O,OH) layer depend on the instability constant (pK) value of the corresponding Zn-complex Zn(L)nin the chemical bath solution. In the region ofpKZn(NH3)2+>pKZn(L)nthe ZnS(O,OH) film's growth rate and ZnS concentration in films increased with the increasing pK value of the used Zn salt complex up to the pK value of theZn[NH3]2+complex and decreased in the region wherepKZn(NH3)2+<pKZn(L)n. The band gap values (around 3.6 eV in most cases) of deposited ZnS(O,OH) films did not depend on the Zn precursor's instability constant, the ZnS(O,OH) film from zinc nitrate containing bath has higher band gap energy (Eg= 3.8 eV). The maximum efficiency of CISSe and CZTSSe monograin layer solar cells was gained with ZnS(O,OH) buffer layer deposited from CBD solution containing Zn(CH3COO)2as Zn source, which provided the highest growth rate and ZnS concentration in the ZnS(O,OH) film on glass substrates.
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4

ZHANG, JIANJUN, and JUNHONG DUAN. "SYNTHESIS AND CHARACTERIZATION OF SPHERE-LIKE ZnS NANOCRYSTALS BY THERMOLYSIS OF A NEW COMPLEX PRECURSOR." Modern Physics Letters B 24, no. 19 (July 30, 2010): 2091–99. http://dx.doi.org/10.1142/s0217984910024456.

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In this paper, the preparation and optical properties of sphere-like ZnS nanocrystals are reported. Pure and uniform cubic-phase sphere-like ZnS nanocrystals with grain sizes of 30–40 nm were synthesized by thermolysis of a new precursor complex ( enH 2)0.5[ Zn ( en )3]( SCN )3 (en = ethylenediamine) in nitrogen stream at 800°C. The as-synthesized products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS), respectively. The XRD analysis reveals the phase of ZnS with cubic zinc blende. UV-Vis and photoluminescence spectra (PL) were utilized to investigate the optical properties of sphere-like ZnS nanocrystals. By testing on UV-Vis spectra, it is concluded that the limiting wavelength of the ZnS nanocrystals is 320 nm and the band gap is 3.88 eV. In room temperature PL spectra, one strong emission peak centered at 322 nm is discovered, which could be attributed to the band to band transitions. The above-mentioned results showed that the thermolysis method is preferable for synthesizing high-quality sphere-like ZnS nanocrystals. The synthesized precursor could be used as morphological templates to prepare nanostructure inorganic compounds.
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5

Rai, S., and R. Kothari. "Synthesis and Spectroscopic Characterization of Zinc Sulphide nanoparticles using Microwave irradiation of Zinc complex of Thiosemicarbazone ligand as a Single Molecular precursor : Pharmacological activities." Digest Journal of Nanomaterials and Biostructures 18, no. 1 (January 2023): 31–45. http://dx.doi.org/10.15251/djnb.2023.181.31.

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Single molecular precursors are appropriate starting materials for synthesis of semiconductor nanoparticles (NPs), which allow for the control of atomic ratio, monodispersity, composition and particle size of nanoscaled metallic sulfide nanoparticles. In the present study, we have reported the synthesis of nanostructured chalcogenides pharmacologically active active zinc sulfide nanoparticles (ZnS NPs) using Zn (II) ion inserted thiosemicarbazone ligand as a single molecular precursor .The precursors were thermally pyrolysized using high energy microwave radiations to obtain very fine ZnS nanoparticles. In this synthesis, we use DMSO as a nonpolar solvent for the synthesis of all compounds. The heating of Zinc complex in the non- aqueous environment of DMSO plays a very crucial role in decreasing reaction time, reducing the chances of side reactions and proper conversion of Zn complex into ZnS nanoparticles. In this reaction Zn complex of thiosemicarbazone ligand provides both Zn2+ and S2- ions for synthesis of ZnS nanoparticles. The microwave synthesis of ZnS NPs from Zn complex is a very simple, fast, highly effective, efficient and low cost method. All synthesized compounds were characterized by various structural, electronic, vibrational, optical, morphological and pharmacological characterizations. The prepared ZnS NPs were found to crystallize in cubic phase, which generally forms at low temperatures, with the dimensions dependent upon the molar ratio of molecular precursors used. Synthesized ZnS nanomaterials had surface sulfur vacancies that extend their absorption spectra towards the visible region and decreased the bond gap. This allowed ZnS nanoparticles to demonstrate various pharmacological activities like antibacterial, antioxidant and anti-inflammatory activities under normal conditions. Powered X-ray diffraction studies confirms the formation of well -defined equispaced crystalline ZnS NPS. TEM and FE SEM microscopic studies confirmed the elongated tubules structure of ZnS NPs with an average particle size of 60 nm. Sharpe electronic absorption band at 390 nm indicates the synthesis of good quality ZnS NPs. The FT-IR spectral studies confirmed the presence of Zn-S stretching, N-H bending and C=N stretching, vibrations in molecular precursor as Zn(II) complex. The thermal analysis of molecular precursor was performed to investigate the thermal stability of zinc complex. The Zn complex was stable up-to 3800 c. All synthesized compounds demonstrated excellent pharmacological activities like antibacterial, antioxidant and antiinflammatory activities as compared to standards used in analysis of compounds. The microwave synthesis of ZnS nanoparticles via single molecular precursor in proper stoichiometric ratios is an excellent and an efficient method for synthesizing highly effective bioactive agents which can be considered as good drug candidate for the treatment of various diseases in future
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6

Shono, Y., and T. Oka. "Complex defects in electron-irradiated ZnS." Journal of Crystal Growth 210, no. 1-3 (March 2000): 278–82. http://dx.doi.org/10.1016/s0022-0248(99)00696-x.

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7

Ajibade, Peter A., and Abimbola E. Oluwalana. "Photocatalytic Degradation of Single and Binary Mixture of Brilliant Green and Rhodamine B Dyes by Zinc Sulfide Quantum Dots." Molecules 26, no. 24 (December 19, 2021): 7686. http://dx.doi.org/10.3390/molecules26247686.

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We present the preparation of octadecylamine-capped ZnS quantum dots from bis(morpholinyldithiocarbamato)Zn(II) complex. The complex was thermolyzed at 130 °C in octadecylamine at different times, to study the effect of reaction time on the morphological and photocatalytic properties of the ZnS quantum dots. Powder X-ray diffraction patterns confirmed a hexagonal wurtzite crystalline phase of ZnS, while HRTEM images showed particle sizes of about 1–3 nm, and energy band gaps of 3.68 eV (ZnS–1), 3.87 eV (ZnS–2), and 4.16 eV (ZnS–3) were obtained from the Tauc plot for the ZnS nanoparticles. The as-prepared ZnS were used as photocatalysts for the degradation of brilliant green, rhodamine B, and binary dye consisting of a mixture of brilliant green-rhodamine B. The highest photocatalytic degradation efficiency of 94% was obtained from ZnS–3 with low photoluminescence intensity. The effect of catalytic dosage and pH of the dyes solution on the photocatalytic process shows that pH 8 is optimal for the degradation of brilliant green, while pH 6.5 is the best for photocatalytic degradation of rhodamine B. The degradation of the binary dyes followed the same trends. The effect of catalytic dosage shows that 1 mg mL−1 of the ZnS nano-photocatalyst is the optimum dosage for the degradation of organic dyes. Reusability studies show that the ZnS quantum dots can be reused five times without a significant reduction in degradation efficiency.
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8

Benalloul, P., J. Benoit, and A. Geoffroy. "TbF3 complex centre in ZnS ACTFEL devices." Journal of Crystal Growth 72, no. 1-2 (July 1985): 553–58. http://dx.doi.org/10.1016/0022-0248(85)90204-0.

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9

Fortmann, Christian. "Bewegungsresistente Verben." Zeitschrift für Sprachwissenschaft 26, no. 1 (January 19, 2007): 1–40. http://dx.doi.org/10.1515/zfs.2007.009.

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AbstractIn German, three types of morphologically complex verbs have to be distinguished with respect to V2-movement. Complex verbs either move as a whole or leave behind a particle or do not move at all. I argue that the latter type –
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10

Koo, Eunhae, and Jong-Chul Lee. "A Turn-On Fluorescent Probe for Detecting Nitric Oxide in Aqueous Media." Journal of Nanomaterials 2014 (2014): 1–5. http://dx.doi.org/10.1155/2014/276057.

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Imaging of nitric oxide (NO) in living cells can provide new insights in understanding unsolved pathways in the cardiovascular and neurological dysfunction and many types of cancers. For the detection of NO under physiological conditions, we synthesized a turn-on fluorescent probe comprising CdSe/ZnS quantum dots (QDs) coordinated with dirhodium complex. Emission from CdSe/ZnS-QDs is quenched when coordinated with the dirhodium complex but can be restored upon the displacement by nitric oxide.
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11

Roy, Shilaj, Satyapriya Bhandari, Mihir Manna, Suranjan De, and Arun Chattopadhyay. "The nature of binding of quinolate complex on the surface of ZnS quantum dots." Physical Chemistry Chemical Physics 21, no. 2 (2019): 589–96. http://dx.doi.org/10.1039/c8cp06235h.

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12

Tsang, Jeffrey J., and David L. Parry. "Metal Mobilization from Complex Sulfide Ore Concentrate: Effect of Light and pH." Australian Journal of Chemistry 57, no. 10 (2004): 971. http://dx.doi.org/10.1071/ch04081.

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The aim of this study was to determine the influence of photo-irradiation and pH on the mobilization of metals from a complex sulfide ore concentrate containing known semiconductors (PbS, ZnS, CdS, FeS2, and CuFeS2). The mobilization of Zn, Fe, and Cd increased under illumination, which is attributed to the semiconductor nature of ZnS, FeS2, and CdS, respectively. An increase in mobilization of Zn, Fe, and Cd under light is observed with decreasing pH, because of increased surface protonation and the greater oxidizing property of photoholes. The semiconductor nature of PbS and CuFeS2 is observed at pH 2. However, at higher pH the concentrations of mobilized Pb and Cu are greater in darkness than under illumination. This is attributed to the light enhanced exchange reactions involving dissolved Pb and Cu with metal sulfides more soluble than PbS and CuS.
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13

Liao, Bolin, and Yunong Zhang. "Different Complex ZFs Leading to Different Complex ZNN Models for Time-Varying Complex Generalized Inverse Matrices." IEEE Transactions on Neural Networks and Learning Systems 25, no. 9 (September 2014): 1621–31. http://dx.doi.org/10.1109/tnnls.2013.2271779.

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14

Pramanik, Sabyasachi, Satyapriya Bhandari, and Arun Chattopadhyay. "Zinc quinolate complex decorated CuInS2/ZnS core/shell quantum dots for white light emission." Journal of Materials Chemistry C 5, no. 29 (2017): 7291–96. http://dx.doi.org/10.1039/c7tc01751k.

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15

Cardoso Castaldo, Fernando, Denizar Cruz Martins, and Ivo Barbi. "Aplicação da célula de comutação ZVS-PWM no conversor CC-CC ponte completa." Eletrônica de Potência 3, no. 1 (November 1, 1998): 1–8. http://dx.doi.org/10.18618/rep.1998.1.001008.

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16

Jang, Ji Wook, Sun Hee Choi, Jum Suk Jang, Jae Sung Lee, Seungho Cho, and Kun-Hong Lee. "N-Doped ZnS Nanoparticles Prepared through an Inorganic−Organic Hybrid Complex ZnS·(piperazine)0.5." Journal of Physical Chemistry C 113, no. 47 (October 28, 2009): 20445–51. http://dx.doi.org/10.1021/jp907526e.

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17

Liang, Caishuang, Xiaoqing Liu, Chunyan Chen, Xiaoming Chen, and Changqun Cai. "Vitro toxicity assessments of nano-ZnS on bovine serum albumin by multispectroscopic methods." Canadian Journal of Chemistry 94, no. 10 (October 2016): 877–81. http://dx.doi.org/10.1139/cjc-2016-0060.

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Measuring protein damaged by nanomaterials may give insight into the mechanisms of toxicity of nanomaterials. The toxic effects of nano-ZnS, nano-Al2O3, nano-ZnCO3, and nano-SiO2 on bovine serum albumin (BSA) were thoroughly studied by multispectroscopic methods, including resonance light scattering, UV-vis absorption spectroscopy, fluorescence spectroscopy, circular dichroism, etc., and the most obvious changes were observed when nano-ZnS interacted with BSA among the four nanoparticles. The experimental results showed that nano-ZnS can bind with BSA to form a complex when the conjugating ratio is 1:1. nano-ZnS can alter the structure of BSA, leading to a loosening of the protein skeleton, and therefore, the internal hydrophobic amino acids are exposed in the loose structure, which indicated that nano-ZnS has an obvious toxic effect on BSA. This work provides a new perspective and method for determining the toxic effects of nanomaterials on biological macromolecules.
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18

Dais, Tyson N., Rina Takano, Takayuki Ishida, and Paul G. Plieger. "Lanthanide induced variability in localised CoII geometries of four triangular L3Co3IILnIII complexes." RSC Advances 12, no. 8 (2022): 4828–35. http://dx.doi.org/10.1039/d1ra08797e.

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Four acyclic CoII–3LnIII triangle complexes are reported in which two Co ions in each complex are octahedral while the third Co exhibits a lanthanide dependent coordination geometry. Magnetic analysis of the La complex shows a large ZFS effect for Co.
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19

Tovstun, S. A. "Calculation of the Molar Absorption Coefficients of InP, ZnS, and InP/ZnS Nanoparticles from the Complex Permittivities of the Corresponding Bulk Semiconductors." Химия высоких энергий 57, no. 2 (March 1, 2023): 114–19. http://dx.doi.org/10.31857/s0023119323020158.

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The molar absorption coefficients of spherical InP, ZnS, and InP(core)/ZnS(shell) nanoparticles have been calculated from the complex permittivities of the corresponding bulk semiconductors. The results are valid in the short-wavelength region of the absorption spectrum, where the quantum size effect is insignificant. For the imaginary part of the polarizability of core/shell nanoparticles, a formula has been obtained that is convenient for calculations in real numbers
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20

Isaeva, Anastasya A., and Vladimir P. Smagin. "INFLUENCE OF LEAD IONS ON PHOTOLUMINESCENT PROPERTIES OF POLYMETHYL METACRYLATE /(Zn,Pb)S/CdS/(Zn,Pb)S COMPOSITIONS." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 63, no. 11 (October 27, 2020): 82–87. http://dx.doi.org/10.6060/ivkkt.20206311.6231.

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The paper presents the results of a study of the effect of lead ions on the photoluminescent properties of core / shell / shell nanostructures based on zinc and cadmium sulfides synthesized in situ during the formation of polyacrylate composition. ZnS/CdS/ZnS and (Zn,Pb)S/CdS/(Zn,Pb)S nanoparticles were obtained by colloidal synthesis in a medium of (poly) methyl methacrylate. Colloidal solutions are solidified to a glassy state by radical thermal polymerization of methyl methacrylate in a block. To initiate the polymerization, benzoyl peroxide was introduced into the solutions in an amount of 0.1% by weight of methyl methacrylate. The conclusion on the formation of nanosized particles of complex composition in the polymer matrix is made by comparing the luminescence and luminescence spectra of the compositions containing ZnS and CdS particles and their structure. In the photoluminescence spectra of the (poly) methyl methacrylate/(ZnS/CdS/ZnS) composition, two complex bands associated with crystal lattice defects of ZnS particles (380 - 530 nm) and CdS (530 - 840 nm) were detected. The excitation of photoluminescence occurs as a result of interband transitions of electrons in each of the semiconductor layers, as well as during transitions of electrons from the conduction band to defect levels located in the forbidden band of the semiconductor structure. In the luminescence excitation spectrum, they correspond to bands of various intensities in the range of 300–420 nm and 300–480 nm. From the overlap of the ZnS luminescence bands and the excitation of CdS luminescence, it was concluded that the radiation of the core is absorbed by the CdS coating layer and that energy is transferred from the levels of structural defects of ZnS to the levels of structural defects of CdS at the layer boundary. Doping of zinc sulfide layers with lead ions leads to a change in the luminescence spectrum in the region of 380 - 530 nm and the disappearance of the CdS luminescence band in the range of 530 - 840 nm. The observed changes are associated with defects that create Pb2+ ions in the crystal lattice of the ZnS outer shell and the screening of the (Zn,Pb)S shell of the inner layers from the penetration of exciting radiation.
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21

Phoohinkong, Weerachon, Thitinat Sukonket, and Udomsak Kitthawee. "A Facile Fynthesis of ZnS Nanostructures via Liquid-Solid Reactions." Advanced Materials Research 979 (June 2014): 184–87. http://dx.doi.org/10.4028/www.scientific.net/amr.979.184.

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Zinc sulfide (ZnS) nanostructures are important materials for many technologies such as sensors, infrared windows, transistors, LED displays, and solar cells. However, many methods of synthesizing ZnS nanostructures are complex and require expensive equipment. In this study, a liquid-solid chemical reaction without surfactant was used to synthesize ZnS at room temperature. In addition, commercial grade zinc oxide (ZnO) particles were used as a precursor. The effect of the addition of acids and inorganic salts were investigated. The products were characterized by field emission scanning electron microscopy (FESEM) coupled with energy-dispersive X-ray spectroscopy (EDX), and transmission electron microscopy (TEM). The results show that the nanoparticles of ZnS were obtained in hydrochloric acid and acetic acid addition. The diameters were in the range of 10 to 20 nm and 50 to 100 nm, respectively. In the case of a sodium chloride salt addition, a ZnS structure was obtained with a particle size of approximately 5 nm and a flake-like morphology.
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22

Sheng, Wei Chen, Jing Tan, Ping Wu, Qiao Chen, and Zhi Ping Zhou. "Synthesis and Optical Properties of ZnS Nanoparticles Using Multi-Mercaptan-Terminated Thio Ether as Surface Modifier." Key Engineering Materials 575-576 (September 2013): 24–29. http://dx.doi.org/10.4028/www.scientific.net/kem.575-576.24.

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ZnS nanoparticles have been prepared by using 2, 3-dimercaptoethylthiopropanethiol (BES) as the coordinating modifier reagent to form Zn-thiol complex at low reaction temperatures. By controlling the experimental conditions, the diameter of the ZnS nanopaticles can be tuned from 43 nm to 115 nm. Systematic experiments were carried out to investigate the factors such as the amounts of the reagents (thiourea and BES) and the temperature, which have great influence on the sizes of the products. And when the content of BES is much higher, ZnS nanopaticles with mercapto surface modification were synthesized. In addition, massive blue shift in UV-vis spectra has been observed and the photoluminescence spectra of the ZnS show a strong emission at approximate 432 nm and 527 nm. Therefore, the preparation and properties studies of different ZnS sizes will offer great opportunities to explore the dependence of a material’s properties and find many interesting applications in the optical devices.
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23

Chen, Kai, Yanling Wu, Xia Kong, Pingshun Zhang, Feifei Sun, Yanli Chen, and Jianzhuang Jiang. "Controlled preparation of ZnS nanoparticle arrays in Langmiur monolayer of an unsymmetrical phthalocyaninato zinc complex: Synthesis, organization and semiconducting properties." Journal of Porphyrins and Phthalocyanines 20, no. 08n11 (August 2016): 1334–41. http://dx.doi.org/10.1142/s1088424616500917.

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A new unsymmetrical phthalocyaninato zinc complex with typical amphiphilic nature, namely 2,3-di(4-hydroxyphenoxy)-9,10,16,17,24,25-hexakis([Formula: see text]-octyloxy)phthalocyaninato zinc, Zn[Pc(OC8H[Formula: see text](OPhOH)2], has been designed, synthesized, and characterized by a range of spectroscopic methods. The Langmuir monolayer of this amphiphilic complex has been used as not only an organic template but also as a good functional organic material to produce the monodispersed nanoparticles of Zn[Pc(OC8H[Formula: see text](OPhOH)2]/ZnS nanocomposite. In addition, multilayer pure and hybrid films have also been obtained by depositing monolayers of the amphiphilic complex and Zn[Pc(OC8H[Formula: see text](OPhOH)2]/ZnS nanocomposite, respectively, using the Langmuir–Shäfer (LS) method. Surface pressure-area isotherms, UV-vis spectroscopic, and XRD studies indicate that the molecules adopted a face-to-face configuration and edge-on orientation in both the multilayer pure LS and Zn[Pc(OC8H[Formula: see text](OPhOH)2]/ZnS hybrid films. In particular, current–voltage (I–V) measurements reveal the superior conductivity of the Zn[Pc(OC8H[Formula: see text](OPhOH)2]/ZnS hybrid film nanocomposites to that of the stand-alone films, and this is due to the existence of the densely packed molecular architecture in the film matrix and the large interfacial area between the two components. These characteristics remove the charge transporting bottleneck by creating an interpenetrating consistent thin film of hybrid materials. The result sheds lights on new ways for developing organic-inorganic hybrid nanostructures with good semiconducting properties.
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Aikawa, Kosei, Mayumi Ito, Atsuhiro Kusano, Sanghee Jeon, Ilhwan Park, and Naoki Hiroyoshi. "Development of a Sustainable Process for Complex Sulfide Ores Containing Anglesite: Effect of Anglesite on Sphalerite Floatability, Enhanced Depression of Sphalerite by Extracting Anglesite, and Recovery of Extracted Pb2+ as Zero-Valent Pb by Cementation Using Zero-Valent Fe." Minerals 12, no. 6 (June 6, 2022): 723. http://dx.doi.org/10.3390/min12060723.

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The presence of anglesite (PbSO4) in complex sulfide ores negatively affects the separation of Cu-Pb sulfides and sphalerite (ZnS) due to lead activation, and PbSO4 rejected to tailings dams contaminates the surrounding environment with lead. To address these problems, this study investigated the application of ethylene diamine tetra acetic acid (EDTA) pretreatment extracting PbSO4 to ZnS flotation and the recovery of the extracted Pb2+ as zero-valent Pb by cementation using zero-valent iron (ZVI). The application of EDTA pretreatment could extract ~99.8% of PbSO4, thus depressing ZnS floatability from 82% to 30%. In addition, cementation using ZVI could recover ~99.7% of Pb2+ from the leachate of EDTA pretreatment.
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Goswami, M. N., and Nilkamal Maiti. "Facile Synthesis of Nanosize ZnS via Complex Decomposition Method." Journal of Chemistry and Chemical Sciences 8, no. 2 (February 6, 2018): 125–34. http://dx.doi.org/10.29055/jccs/567.

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26

Okamoto, Kenji, Takuya Yoshimi, and Shoshin Miura. "TbOF complex centers in ZnS thin‐film electroluminescent devices." Applied Physics Letters 53, no. 8 (August 22, 1988): 678–80. http://dx.doi.org/10.1063/1.99848.

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27

Sliusariak, T. K., Y. M. Andriichuk, S. A. Vojtovych, M. A. Zhukovskyi, and Y. B. Khalavka. "Synthesis of CdSe/ZnS Nanoparticles with Multiple Photoluminescence." Фізика і хімія твердого тіла 21, no. 1 (March 29, 2020): 105–12. http://dx.doi.org/10.15330/pcss.21.1.105-112.

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The CdSе/ZnS nanostructures of Core-Shell type, that have multi-wave emission, are described and a scheme of possible energy transitions in the studied system is presented. CdSe nuclei were synthesized by mixing cadmium and selenium precursors without creating an inert atmosphere. The cadmium complex with sulphanilamide was used as a cadmium precursor and simultaneously as a stabilizing ligand. To grow the shell, zinc stearate and thiourea were gradually added to the solution of cadmium selenide nuclei in octadecene at 200°C. TEM studies show that the obtained CdSe/ZnS nanoparticles have the shape close to tetrahedral with an effective diameter up to 10 nm. The thickness of the ZnS shell is about 3-4 nm. From the absorption spectra of the CdSe/ZnS nanoparticles, it is clear that the shell growth leads to a sharp increase in the absorption in the short wavelentgh area, which means the formation of a wide gap ZnS material. The obtained CdSe/ZnS nanostructures emit three fluorescence peaks in the visible range. They are attributed to exciton transitions in the nucleus, recombination at defects of the boundary between the core and the shell, and recombination at defects of the shell. Such property provides CdSe/ZnS nanocrystals with a wide range of functionalities.
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Hernández-Gordillo, Agileo, C. García-Mendoza, M. A. Alvarez-Lemus, and Ricardo Gómez. "Photocatalytic reduction of Cr(VI) by using stacked ZnS layers of ZnS( en ) x complex." Journal of Environmental Chemical Engineering 3, no. 4 (December 2015): 3048–54. http://dx.doi.org/10.1016/j.jece.2015.02.028.

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29

Смагин, В. П., Л. В. Затонская, Е. Г. Ильина, and Е. П. Харнутова. "Фотолюминесценция композиций полиметилметакрилат/(Zn, Cu, Ag)S : Eu-=SUP=-3+-=/SUP=-." Физика твердого тела 62, no. 7 (2020): 1074. http://dx.doi.org/10.21883/ftt.2020.07.49476.037.

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Luminescent nanoscale particles (quantum dots) (Zn,Cu,Ag)S:Eu3+ were synthesized during decomposition of thioacetamide complexes of metals in a methylmethacrylate medium during block polymerization under heating. The formation of quantum dots is confirmed by the corresponding band in the optical absorption spectrum of polymer compositions. Photoluminescence of PMMA/(Zn,Cu,Ag)S:Eu3+ compositions is manifested as a complex band associated with defects in the crystal structure formed when ZnS was doped with copper and silver ions, and a set of narrow bands of luminescence of Eu3+ ions. Luminescence excitation occurs as a result of inter-zone transitions and electron transitions from the valence band to the ZnS defect levels, and self-absorption of energy by Eu3+ ions. The relationship of ions Eu3+ particles of ZnS is confirmed by the dependence of the intensity of the broadband luminescence of ZnS with increasing concentration of ions Eu3+ and an increase in intensity narrow-band luminescence of ions Eu3+ as a result of energy transfer from levels of doped ZnS crystals on the energy levels of the ions Eu3+.
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Liu, Wei, Xian Lan Chen, Ju Cheng Zhang, Yun Hui Long, Ling Shi, and Na Wu. "Preparation ZnS Quantum Dots via Water-Phase Synthesis Method." Advanced Materials Research 706-708 (June 2013): 230–33. http://dx.doi.org/10.4028/www.scientific.net/amr.706-708.230.

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With water as the medium, PVP as stabilizer and ammonia as complexing agents and adjusting pH value of the solution, we report an all-aqueous synthesis of highly photoluminescent and stable ZnS quantum dots (QDs) by water-phase synthesis reaction between ZnCl2 and NaS at different temperatures and times. The optimal reaction conditions of PVP-capped ZnS QDs were obtained through experiment as follows: the concentration ZnCl2 and NaS solution both are 1 mM, (PVP):(ZnCl2) = 0.0167 (v/v), (NH3):(ZnCl2)=1:300 (v/v), the optimal reaction temperature is 40 °C, the optimal reaction time is 30 min. With ammonia as complexing agents, Zn(OH)2 can dissolve in ammonia and form to complex ions ((Zn(NH3)4)2+), which make Zn2+ release slowly to control the nucleus growth rate of ZnS, thus obtain small size of nanoparticles. The fluorescence spectra shows that the emission peaks of ZnS QDs around ~395 nm and ~470 nm on the emission spectra, which are consistent with literatures, so nano-ZnS QDs was synthesized successfully in this paper.
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Nie, Chengming, Wenjun Ni, Lunlun Gong, Jian Jiang, Junhui Wang, and Mei Wang. "Charge transfer dynamics and catalytic performance of a covalently linked hybrid assembly comprising a functionalized cobalt tetraazamacrocyclic catalyst and CuInS2/ZnS quantum dots for photochemical hydrogen production." Journal of Materials Chemistry A 7, no. 48 (2019): 27432–40. http://dx.doi.org/10.1039/c9ta10479h.

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Covalently attaching the cobalt tetraazamacrocyclic complex to the surface of CuInS2/ZnS quantum dots enhanced the charge-separation efficiency and photocatalytic activity of the hybrid system.
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32

Feng, Chen, Liu Ping Zheng, Gui Yang Yan, and Meiu Qin Zheng. "Photocatalytic Degradation of Eosin B by ZnS Nanoparticles under Visible Light." Advanced Materials Research 236-238 (May 2011): 2080–85. http://dx.doi.org/10.4028/www.scientific.net/amr.236-238.2080.

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Nanocrystalline ZnS particles were prepared by hydrothermal method and characterized by XRD, FT-IR, TEM and UV-vis DRS and their photocatalytic activities were evaluated by the photodegradation of Eosin B under visible light. The results showed that the ZnS nanoparticles we prepared were in hexagonal phase, their average size of the complex particles varies from 10 nm to 20 nm, and also revealed well photocatalytic activity under visible light, the photocatalytic decolouration rate of Eosin B in 3 h reached 70 %.
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33

Valanciunaite, Jurga, Andrey S. Klymchenko, Artiom Skripka, Ludovic Richert, Simona Steponkiene, Giedre Streckyte, Yves Mely, and Ricardas Rotomskis. "A non-covalent complex of quantum dots and chlorin e6: efficient energy transfer and remarkable stability in living cells revealed by FLIM." RSC Adv. 4, no. 94 (2014): 52270–78. http://dx.doi.org/10.1039/c4ra09998b.

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Non-covalent complex of lipid-coated CdSe/ZnS quantum dots and second-generation photosensitizer, chlorin e6 can enter living HeLa cells with maintained integrity that ensures efficient FRET.
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34

Bahena-Martínez, Claudia J., Nayely Torres-Gómez, and Alfredo R. Vilchis-Néstor. "Study of the temperature effect on the morphology and structure of ZnS nanoparticles synthesized by hydrothermal method." MRS Advances 5, no. 63 (2020): 3379–88. http://dx.doi.org/10.1557/adv.2020.409.

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AbstractThe control over the materials structure is crucial for the modulation of its properties, in order to achieve this control is important to know the formation mechanism of the material as function of parameters used. For this purpose, the effect of temperature (120, 140, 160 and 180 °C) on the hydrothermal synthesis of zinc sulphide is evaluated and a proposal of the sequence of reactions formation of zinc sulphur is presented. ZnS nanostructures with blend-phase were obtained, the temperature increment induces the growth of the nanostructure ranged between .62 and 12.72 nm, furthermore, increase the crystallinity of the ZnS nanostructures. The proposed reactions suggest the formation of a complex of thioacetamide with the Zn+2 and its subsequent decomposition into ZnS.
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35

Halaš, Petr, Ivan Nemec, and Radovan Herchel. "Honey-like Odor Meets Single-Ion Magnet: Synthesis, Crystal Structure, and Magnetism of Cobalt(II) Complex with Aromatic Trans-Cinnamic Acid." Magnetochemistry 9, no. 11 (November 16, 2023): 229. http://dx.doi.org/10.3390/magnetochemistry9110229.

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The hexacoordinate Co(II) complex [Co(neo)2(cin)][BPh4]·½Me2CO (1·½Me2CO) containing trans-cinnamic acid (Hcin) and neocuproine (neo) was prepared. The compound 1·½Me2CO was characterized via single-crystal X-ray analysis, FT-IR spectroscopy, and magnetic measurements. The coordination polyhedron of the complex cation adopts a deformed octahedron shape, and cinnamate exhibits a bidentate mode of coordination, which is unusual for mononuclear Co(II) cinnamate complexes. The analysis of DC magnetic measurements with zero-field splitting (ZFS) spin Hamiltonian revealed large magnetic anisotropy defined by the axial ZFS parameter D = +53.2 cm−1. AC susceptibility measurements revealed the slow relaxation of magnetization under the applied field; thus, 1·½Me2CO behaves as a field-induced single-molecule magnet. The analysis of magnetic properties was also supported by CASSCF/NEVPT2 calculations.
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36

Chong, Eric, Kian Keong Poh, Shen Liang, Xu Min Hou, and Huay Cheem Tan. "Eighteen-Month Clinical Safety and Efficacy Outcomes of Sirolimus-, Paclitaxel and Zotarolimus-drug Eluting Stents in Diabetic Patients Undergoing Percutaneous Coronary Intervention for Complex Coronary Artery Stenosis." Annals of the Academy of Medicine, Singapore 39, no. 5 (May 15, 2010): 381–84. http://dx.doi.org/10.47102/annals-acadmedsg.v39n5p381.

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Introduction: This was a single centre registry study on clinical efficacy and safety of drug-eluting stent (DES) in diabetic patients undergoing percutaneous coronary intervention (PCI) for complex coronary lesions. Materials and Methods: A total of 288 diabetic patients who underwent elective PCI between September 2003 and June 2006 in our centre were enrolled and followed-up for 18 months. Among them, 79 (27.4%) patients received sirolimus-eluting stent (SES), 138 (47.9%) paclitaxel-eluting stent (PES) and 71 (24.7%) zotarolimus-eluting stent (ZES). The endpoints were major adverse cardiac events (MACE) and stent thrombosis rates. Results: Baseline demographics were comparable among the 3 DES groups (median age was 60 years; 69% men). Complex lesions (defined as ACC/AHA type C stenosis) accounted for 55.6% of the total lesions: SES (50.6%), PES (65.2%) and ZES (43.7%), P = 0.005. At 18 months follow-up, the composite endpoint of MACE was found in 12.7% in SES group, 8.7% in the PES group, 12.7% in ZES group and (P = 0.55). Stent thrombosis (ST) occurred in 1 patient (1.3%) in the SES group, 2 patients (1.4%) in PES group and 1 patient (1.4%) in ZES group, respectively (P = 1.00). Conclusion: The use of DES for elective PCI in diabetic patients was associated with favourable intermediate-term clinical outcomes with no significant differences in efficacy among the 3 groups. Stent thrombosis had low event occurrence rate. Key words: Drug-eluting coronary stents, Diabetes mellitus, Stent thrombosis
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Guediri, Abderraouf, Abdallah Bouguettoucha, Hichem Tahraoui, Derradji Chebli, Jie Zhang, Abdeltif Amrane, Lotfi Khezami, and Amin Aymen Assadi. "The Enhanced Adsorption Capacity of Ziziphus jujuba Stones Modified with Ortho-Phosphoric Acid for Organic Dye Removal: A Gaussian Process Regression Approach." Water 16, no. 9 (April 24, 2024): 1208. http://dx.doi.org/10.3390/w16091208.

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Here, the chemical modification of Ziziphus jujuba stones (ZJS) treated with ortho-phosphoric acid (ZJS-H3PO4) is investigated to enhance its adsorption properties for organic dyes. The physicochemical properties of ZJS-H3PO4 reveal increased porosity (87.29%), slightly higher bulk density (0.034 g mL−1), and enhanced acidity (31.42 m eq g g−1) compared to untreated ZJS. XRF analysis confirms the successful incorporation of orthophosphoric acid during treatment due to a significant increase in phosphorus content. The maximum adsorption capacity of methylene blue on ZJS-H3PO4 is found to be 179.83 mg g−1, demonstrating its efficacy as a potential adsorbent for organic dyes. These findings suggest that modifying ZJS with orthophosphoric acid could be a promising strategy to enhance its adsorption performance in various environmental applications. Furthermore, Gaussian process regression (GPR) is employed to model MB adsorption by ZJS-H3PO4. Optimization of the GPR model involves evaluating different kernel functions and meticulously adjusting parameters to maximize its ability to capture complex relationships in the data. The obtained GPR model demonstrates remarkable performance with high correlation coefficients (R) and low root mean square errors (RMSEs) across all study phases. Model validation is performed through residual analysis, confirming its effectiveness and accuracy in predicting MB adsorption. Finally, a user-friendly interface is developed to facilitate the usage of the GPR model in future applications, representing a significant advancement in environmental process modeling and ecosystem management.
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38

Mirnaya, Tatiana, Galina Yaremchuk, and Alexander Kosheliev. "SYNTHESIS AND OPTICAL PROPERTIES OF MESOMORPHIC GLASSY NANOCOMPOSITES BASED ON CADMIUM CAPRYLATE WITH CdSe / ZnS HETERONANOPARTICLES." Ukrainian Chemistry Journal 85, no. 1 (February 15, 2019): 13–18. http://dx.doi.org/10.33609/0041-6045.85.1.2019.13-18.

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The paper presents on the synthesis and optical properties of mesomorphic composites, based on a glassy liquid-crystalline caprylate matrix, with CdSе/ZnS hetero-nanoparticles. The synthesis of complex core-shell semiconductor nanoparticles was carried out by fusing together a cadmium caprylate composite with CdSе nanoparticles and zinc caprylate composite with ZnS nanoparticles. The cadmium and zinc chalcogenide nanoparticles have been synthesized in molten cadmium caprylate and zinc caprylate respectively. It has been found by optical spectroscopy that the have hetero-nanoparticles a core-shell structure. The effect of the composition (molar ratio of the components) of CdSе/ZnS hetero-nanoparticles on their spectral characteristics has been studied. It has been shown that the nanocomposites with hetero-nanoparticles are characterized by a more intense exciton fluorescence band than composites with individual CdSе or ZnS nanoparticles. It has been found that by varying the hetero-nanoparticle composition, one can change the core-shell thickness ratio and adjust thereby the absorption and emission band edge. As the number of ZnS nanoparticles in CdSе/ZnS hetero-nanoparticles increases some narrowing of the long- wavelength emission region first takes plase, which may be attributed to a reduction in the recombination of the smaller number of surface trapped exciton, and then, at a large ZnS content, a broadening of the long- wavelength emission region takes plase due to the extended CdSе/ZnS surface. It has been found that the main contribution to the exciton fluorescence of nanocomposites with CdSе/ZnS hetero-nanoparticles is made by cadmium selenide nanoparticles, and that zinc sulfide nanoparticles enhance exciton fluorescence, also due to decrease in surface emission. It has been shown that the nanocomposites with hetero-nanoparticles are characterized by a more intense exciton fluorescence band that the nanocomposites with individual CdSе. The highest emission is observed in the case of the 35-55 % ZnS content of the shell, and at a smaller or larger amount of ZnS, emission intensity decreases.
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39

Stephen, Tom Li, Marcus Niemeyer, Arthur O. Tzianabos, Martin Kroenke, Dennis L. Kasper, and Wiltrud M. Kalka-Moll. "Effect of B7-2 and CD40 Signals from Activated Antigen-Presenting Cells on the Ability of Zwitterionic Polysaccharides To Induce T-Cell Stimulation." Infection and Immunity 73, no. 4 (April 2005): 2184–89. http://dx.doi.org/10.1128/iai.73.4.2184-2189.2005.

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ABSTRACT Carbohydrates have been thought to stimulate immune responses independently of T cells; however, zwitterionic polysaccharides (ZPSs) from the capsules of some bacteria elicit potent CD4+-T-cell responses in vivo and in vitro. We demonstrated that HLA-DR on professional antigen-presenting cells (APCs) is required for ZPS-induced T-cell proliferation in vitro (15). Recently, it was shown that ZPSs are processed to low-molecular-weight carbohydrates by a nitric oxide-mediated mechanism in endosomes and locate in the major histocompatibility complex class II pathway (5, 15). The effect of the ZPS-mediated expression of HLA-DR and costimulatory molecules on the APC and T-cell engagement and subsequent T-cell activation has not been elucidated. Herein, we report that ZPS-mediated induction of HLA-DR-surface expression and T-cell proliferation are maximally enhanced after incubation of APCs for 8 h with ZPS. Treatment of APCs with bafilomycin A inhibits the up-regulation of ZPS-mediated HLA-DR surface expression and leads to inhibition of T-cell proliferation. Monoclonal antibodies (MAbs) to the costimulatory molecules B7-2 and CD40L specifically block ZPS-mediated T-cell activation, while a MAb to B7-1 does not. Surface expression of B7-2 and B7-1 but not of CD40 is maximally enhanced at 8 to 16 h of treatment of APCs with ZPS. The results demonstrate that the cellular immune response to ZPS depends on the translocation of HLA-DR to the cell surface and requires costimulation via B7-2 and CD40 on activated APCs. The implication is that activation of ZPS-specific T cells requires an orchestrated arrangement of both presenting and costimulatory molecules to form an immunological synapse.
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40

Mangal, Utkarsh, Jae-Sung Kwon, and Sung-Hwan Choi. "Bio-Interactive Zwitterionic Dental Biomaterials for Improving Biofilm Resistance: Characteristics and Applications." International Journal of Molecular Sciences 21, no. 23 (November 29, 2020): 9087. http://dx.doi.org/10.3390/ijms21239087.

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Biofilms are formed on surfaces inside the oral cavity covered by the acquired pellicle and develop into a complex, dynamic, microbial environment. Oral biofilm is a causative factor of dental and periodontal diseases. Accordingly, novel materials that can resist biofilm formation have attracted significant attention. Zwitterionic polymers (ZPs) have unique features that resist protein adhesion and prevent biofilm formation while maintaining biocompatibility. Recent literature has reflected a rapid increase in the application of ZPs as coatings and additives with promising outcomes. In this review, we briefly introduce ZPs and their mechanism of antifouling action, properties of human oral biofilms, and present trends in anti-biofouling, zwitterionic, dental materials. Furthermore, we highlight the existing challenges in the standardization of biofilm research and the future of antifouling, zwitterated, dental materials.
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41

Yao, Bing, Ying Chen, Mengzhe Wang, and Min Liu. "Fenton process enhanced by metal sulfide for treating the actual evaporated mother liquid of gas field wastewater." Water Reuse 13, no. 2 (March 22, 2023): 193–204. http://dx.doi.org/10.2166/wrd.2023.081.

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Abstract Evaporated mother liquor of gas field wastewater (EML-GFW) is a form of wastewater generated by the triple-effect evaporation treatment of gas field wastewater containing complex pollutants. In this study, four metal sulfides, CuS, ZnS, MoS2, and WS2, were used to strengthen the Fenton process in EML-GFW treatment. The optimum Fenton/ZnS process for the highest removal of TOC from EML-GFW was achieved at the initial pH of 3.0 and in a mixture of FeSO4·7H2O:ZnS:H2O2 in the ratio of 30 g/L:10 g/L:1.2 mol/L, with a TOC removal efficiency of 74.5%. The organic components analysis of EML-GFW over four distinct periods demonstrated that the presence of N,N-dimethylethanolamine (DMEA) persisted and accounted for the greatest proportion of pollutants, identifying it as the characteristic pollutant. The TOC removal mechanism by Fenton/ZnS was revealed via analysis of organic materials obtained from the Fenton/ZnS process, tert-butanol quenching experiment, and illumination experiment. ZnS-generated hole–electron pairs under illumination, which promoted the reduction of Fe3+ to Fe2+, followed by an acceleration of •OH generation, thus improving TOC removal efficiency. The Fenton/ZnS process improved the treatment of EML-GFW in the laboratory, providing strong data support and theoretical guidance for expanding this technology at the gas field project site.
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42

Chai, Lanlan, Wen He, Lin Sun, Feng Jin, Xiangyang Hu, and Jilong Ma. "Solvothermal synthesis of wurtzite ZnS complex spheres with high hierarchy." Materials Letters 120 (April 2014): 26–29. http://dx.doi.org/10.1016/j.matlet.2014.01.028.

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43

Kreissl, J., B. Litzenburger, U. W. Pohl, W. Gehlhoff, and H. E. Gumlich. "EPR identification of a monoclinic Fe-related complex in ZnS." Solid State Communications 94, no. 8 (May 1995): 667–72. http://dx.doi.org/10.1016/0038-1098(95)00004-6.

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44

Mi, Liwei, Minle Han, Zhen Li, Fengling Yang, Changyu Shen, and Zhi Zheng. "Zinc Coordination Complex for use in Uniform ZnS Microflowers Synthesis." Zeitschrift für anorganische und allgemeine Chemie 636, no. 11 (June 16, 2010): 1913–16. http://dx.doi.org/10.1002/zaac.201000136.

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45

Onwudiwe, Damian C., Jerry O. Adeyemi, Rebecca T. Papane, Felicia F. Bobinihi, and Eric Hosten. "Synthesis, optical and structural characterisation of ZnS nanoparticles derived from Zn(ii) dithiocarbamate complexes." Open Chemistry 19, no. 1 (January 1, 2021): 1134–47. http://dx.doi.org/10.1515/chem-2021-0094.

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Abstract Zinc sulphide nanoparticles represented as ZnS1, ZnS2 and ZnS3 have been prepared from Zn(ii) N-methyl-N-ethanoldithiocarbamate (1) complex and its 2,2′-bipyridine (2) and 1,10′-phenanthroline (3) adducts, respectively. Both the parent complex (1) and the adducts (2) and (3) were characterised by spectroscopic techniques and elemental analysis. In the solid state, the structures of complexes (1) and (2) were established using single-crystal X-ray analysis. Complex (1) possessed a distorted trigonal bipyramidal geometry about the zinc centre, whilst forming a dimer via bidentate bridging coordination between two opposite dithiocarbamate motifs. On the other hand, complex (2) formed a trigonal prismatic geometry about the Zn centre with a ZnS4N2 chromophore. The decomposition of the complexes in hexadecylamine afforded spherical-shaped ZnS nanoparticles of the cubic sphalerite crystal phase. The transmission electron microscopy (TEM) micrographs showed that the average particles size of ZnS1, ZnS2 and ZnS3 were 2.63, 5.27 and 6.52 nm, respectively. In the optical study, the estimated bandgap energies were found in the range between 4.34 and 4.08 eV, which indicated a blue shift when compared with the bandgap energy of bulk ZnS.
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46

Shilovskikh, O. V., V. O. Ponomarev, V. N. Kazaykin, K. A. Tkachenko, A. S. Vokhmintsev, I. A. Weinstein, S. M. Rozanova, M. V. Kirf, and S. V. Marysheva. "Evaluation of the Anti-Infectious Activity of the Complex Based on Quantum Dots InP / ZnSe / ZnS 650 and Tobramycin Against <i>Pseudomonas Aeruginosa</i> Infection of the Cornea. Experimental Research." Ophthalmology in Russia 20, no. 1 (April 6, 2023): 157–64. http://dx.doi.org/10.18008/1816-5095-2023-1-157-164.

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Microbial keratitis (MK) is a homogeneous group of diseases accompanied by loss of the corneal epithelium, stromal leukocyte infiltration and/or destructive tissue breakdown, occurring when the protective mechanisms of the ocular surface are disturbed, which require an immediate set of therapeutic measures, including, first of all, massive etiotropic therapy, which is represented, as a rule, by broad-spectrum antibiotics (AB) and anti-inflammatory drugs. One of the most threatening MK pathogens is P. aeruginosa (PA) (Pseudomonas aeruginosa). Multiple drug resistance, the highest pathogenicity, numerous RA virulence factors dictate the need to search for new highly effective methods to combat MC, in the etiological structure of which RA dominates. The most promising direction in this area is the use of artificial fluorophores, in particular quantum dots (QDs). The objective of this study was to evaluate the anti-infectious activity of the complex based on InP/ZnSe/ZnS 650 quantum dots and Tobramycin against Pseudomonas aeruginosa infection of the cornea. As an object of study, laboratory New Zealand rabbits (No. 6) were studied — 2 females, 4 males, which were induced bacterial keratitis by introducing a nosocomial Ps strain. aeruginosa in the structure of the cornea. The following antimicrobial agents were used: Tobramycin solution 5 ml for epibulbar application and a bioconjugate based on QD InP/ZnSe/ZnS 650 and tobramycin. Laboratory animals were divided into 2 groups. Rabbits of the 1st group, after the manifestation of the clinical picture of microbial keratitis, received instillations of tobramycin drops into the conjunctival sac every 2 hours for 3 days with a complete absence of positive clinical dynamics and a subsequent transition from day 4 in order to anatomically preserve the eyeball to instillations of the CT InP/ZnSe/ZnS complex 650 + Tobramycin. Rabbits of the 2nd group received instillations of the CT + Tobramycin complex and showed positive dynamics in relation to the regression of symptoms from the 2nd day of therapy. As methods of dynamic observation, photoregistration of the anterior segment with fluorescein staining and optical coherence tomography of the anterior segment were used. A clinical experiment has demonstrated the highest efficiency of the InP/ZnSe/ZnS 650 + Tobramycin complex in relation to Pseudomonas aeruginosa strain resistant to Tobramycin monotherapy.
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47

George, Jisha, G. Rathika Nath, V. S. Lekha, and K. Rajesh. "Zinc Complex of Cyclododecanone Thiosemicarbazone as Single Source Precursor for ZnS Nanoparticles by Polyol Method." Asian Journal of Chemistry 34, no. 8 (2022): 2055–60. http://dx.doi.org/10.14233/ajchem.2022.23742.

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Zn(II) complex of a newly synthesized ligand cyclododecanone thiosemicarbazone (CDDTSC) have been synthesized and characterized by UV-visible spectroscopy, photoluminescence, X-ray diffraction, scanning electron microscopy, EDX and transmission electron microscopy studies. Thermal decomposition properties of the complex also were studied. The complex was subjected to thermal decomposition in a high boiling solvent glycerol to get zinc sulphide nanoparticles. Highly crystalline, mono-dispersed and well defined ZnS nanoparticles were obtained in good quantity, even in the absence of capping agents.
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48

Bédard, Mikaël, Vincent Roy, Martin Montagne, and Pierre Lavigne. "Structural Insights into c-Myc-interacting Zinc Finger Protein-1 (Miz-1) Delineate Domains Required for DNA Scanning and Sequence-specific Binding." Journal of Biological Chemistry 292, no. 8 (December 29, 2016): 3323–40. http://dx.doi.org/10.1074/jbc.m116.748699.

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c-Myc-interacting zinc finger protein-1 (Miz-1) is a poly-Cys2His2 zinc finger (ZF) transcriptional regulator of many cell cycle genes. A Miz-1 DNA sequence consensus has recently been identified and has also unveiled Miz-1 functions in other cellular processes, underscoring its importance in the cell. Miz-1 contains 13 ZFs, but it is unknown why Miz-1 has so many ZFs and whether they recognize and bind DNA sequences in a typical fashion. Here, we used NMR to deduce the role of Miz-1 ZFs 1–4 in detecting the Miz-1 consensus sequence and preventing nonspecific DNA binding. In the construct containing the first 4 ZFs, we observed that ZFs 3 and 4 form an unusual compact and stable structure that restricts their motions. Disruption of this compact structure by an electrostatically mismatched A86K mutation profoundly affected the DNA binding properties of the WT construct. On the one hand, Miz1–4WT was found to bind the Miz-1 DNA consensus sequence weakly and through ZFs 1–3 only. On the other hand, the four ZFs in the structurally destabilized Miz1–4A86K mutant bound to the DNA consensus with a 30-fold increase in affinity (100 nm). The formation of such a thermodynamically stable but nonspecific complex is expected to slow down the rate of DNA scanning by Miz-1 during the search for its consensus sequence. Interestingly, we found that the motif stabilizing the compact structure between ZFs 3 and 4 is conserved and enriched in other long poly-ZF proteins. As discussed in detail, our findings support a general role of compact inter-ZF structures in minimizing the formation of off-target DNA complexes.
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49

JAWORE, ABERA MADISHA, THOKOZANI XABA, ZONDI NATE, TSHEPO NTSOANE, and MAKWENA JUSTICE MOLOTO. "Optimization of Reaction Parameters during the Synthesis of Hexagonal Hexadecylamine Capped ZnS Nanoparticles." Asian Journal of Chemistry 35, no. 10 (September 28, 2023): 2487–92. http://dx.doi.org/10.14233/ajchem.2023.28055.

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Zinc sulphide nanoparticles capped with hexadecylamine (ZnS-HDA) have been synthesized through thermal decomposition of (Z)-2- (pyrrolidin-2-ylidene)thiourea zinc(II) complex. The effects of temperature, time and concentration of the precursor on the properties of ZnS-HDA capped nanoparticles were investigated. The values of the optical band edges were increasing when the temperature, reaction tim and the amount of the precursor were elevated. X-ray diffraction patterns of all the synthesized nanoparticles mainly exhibited hexagonal phase structures. The morphologies of the particles were increasing with the increase in temperature, time and precursor concentration.
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50

Manziuc, Manuela, Andreea Kui, Andrea Chisnoiu, Anca Labuneț, Marius Negucioiu, Ana Ispas, and Smaranda Buduru. "Zirconia-Reinforced Lithium Silicate Ceramic in Digital Dentistry: A Comprehensive Literature Review of Our Current Understanding." Medicina 59, no. 12 (December 8, 2023): 2135. http://dx.doi.org/10.3390/medicina59122135.

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Zirconia-reinforced lithium silicate (ZLS) ceramic is a new innovative dental material with unique a chemical composition that is designed to combine harmoniously with the appropriate optical properties of lithium disilicate and the enhanced mechanical strength of zirconia. A thorough understanding of ZLS materials is essential for both clinicians and dental technicians. At present, the mechanical behavior and optical properties of the ZLS ceramic system have not been extensively researched, and there is still a lack of consensus regarding the fabrication process and clinical behavior of ZLS all-ceramic restorations. The aim of the present study was to present a selection of comprehensive information concerning zirconia-reinforced lithium silicate ceramics and their optical and mechanical properties, as well as to assess data regarding cementation procedures and clinical outcomes for ZLS all-ceramic restorations. Three electronic databases (PubMed, Web of Science, and the Cochrane Library) were used for the research by two independent reviewers. The search was limited to articles published in the English language, as well as clinical and in vitro studies of color and studies on mechanical behavior and the cementation procedures of ZLS restorations. The exclusion criteria comprised abstracts, questionnaire-based studies, case reports, literature reviews, and studies that were not available in English. Zirconia-reinforced lithium-silicate-based ceramic presents a unique and complex microstructure that increases mechanical resistance but decreases aesthetic appearance, especially its translucency, due to tetragonal zirconia content. A material’s thickness, the color of the underlying tooth structure, and the resin cement shade are important factors that influence the final shade and aesthetic appearance of ZLS restorations. Mechanical properties, which are defined by the fracture toughness, flexural strength, elastic modulus, and hardness of ZLS ceramic are higher compared to feldspathic, lithium disilicate, and hybrid ceramics, as well as resin nanoceramics; however, they are lower than translucent or high-translucency zirconia. Acid etching, sandblasting, and laser etching represent the most used methods to prepare the ZLS restoration surfaces for proper bonding procedures.
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