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https://www.readbyqxmd.com/read/29145527/evaluation-of-operating-time-and-patient-perception-using-conventional-impression-taking-and-intraoral-scanning-for-crown-manufacture-a-split-mouth-randomized-clinical-study
#1
Yasser Haddadi, Golnosh Bahrami, Flemming Isidor
PURPOSE: To compare operating time and patient perception of conventional impression (CI) taking and intraoral scanning (IOS) for manufacture of a tooth-supported crown. MATERIALS AND METHODS: A total of 19 patients needing indirect full-coverage restorations fitting the requirements for a split-mouth design were recruited. Each patient received two lithium disilicate crowns, one manufactured from CI taking and one from IOS. Both teeth were prepared following the manufacturers' recommendations...
November 16, 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29145289/mercury-poisoning-through-intravenous-administration-two-case-reports-with-literature-review
#2
Qiuying Lu, Zilong Liu, Xiaorui Chen
RATIONALE: Metallic mercury poisoning through intravenous injection is rare, especially for a homicide attempt. Diagnosis and treatment of the disease are challenging. PATIENT CONCERNS: A 34-year-old male presented with pyrexia, chill, fatigue, body aches, and pain of the dorsal aspect of right foot. Another case is that of a 29-year-old male who committed suicide by injecting himself metallic mercury 15 g intravenously and presented with dizzy, dyspnea, fatigue, sweatiness, and waist soreness...
November 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29145152/possible-role-of-arthrospira-platensis-in-reversing-oxidative-stress-mediated-liver-damage-in-rats-exposed-to-lead
#3
Samah R Khalil, Walaa M Elhady, Yaser H A Elewa, Noura E Abd El-Hameed, Sozan A Ali
Environmental pollutants, particularly metallic elements, mobilized and released into the environment, eventually accumulate in the food chain and thus pose a serious threat to human and animal health. In the present study, the role of Arthrospira (Spirulina platensis; SP) as a protector against oxidative stress-mediated liver damage induced by an exposure to lead acetate (LA; as a metallic pollutant) was assessed. To achieve this aim, rats were orally administered with 300 mg/kg bw SP for 15 days, before and concurrently with an intraperitoneal injection of 50 mg/kg bw LA (6 injections throughout 15 days)...
November 13, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29145136/lead-cadmium-and-arsenic-in-human-milk-and-their-socio-demographic-and-lifestyle-determinants-in-lebanon
#4
Maya Bassil, Farah Daou, Hussein Hassan, Osama Yamani, Joelle Abi Kharma, Zouheir Attieh, Jomana Elaridi
INTRODUCTION: Exposure of newborns to toxic metals is of special interest due to their reported contamination in breast milk and potential harm. The aim of this study was to assess the occurrence and factors associated with lead, cadmium and arsenic contamination in breast milk collected from lactating mothers in Lebanon. METHODS: A total of 74 breast milk samples were collected from primaparas according to guidelines set by the World Health Organization. A survey was administered to determine the demographic and anthropometric characteristics of participating lactating mothers...
October 27, 2017: Chemosphere
https://www.readbyqxmd.com/read/29145129/high-contamination-in-the-areas-surrounding-abandoned-mines-and-mining-activities-an-impact-assessment-of-the-dilala-luilu-and-mpingiri-rivers-democratic-republic-of-the-congo
#5
Emmanuel K Atibu, Pierre Lacroix, Periyasamy Sivalingam, Nicolas Ray, Gregory Giuliani, Crispin K Mulaji, Jean-Paul Otamonga, Pius T Mpiana, Vera I Slaveykova, John Poté
Abandoned mines and mining activities constitute important sources of toxic metals and Rare Earth Elements (REEs) affecting surrounding environmental compartments and biota. This study investigates the contamination degree and distribution of toxic metals and REEs in contrasting sediment, soil and plant samples surrounding rivers in the African copperbelt area characterized by the presence of numerous abandoned mines, artisanal and industrial mining activities. ICP-MS results highlighted the highest concentration of Cu, Co and Pb in sediments reaching values of 146,801, 18,434 and 899 mg kg(-1), respectively...
October 21, 2017: Chemosphere
https://www.readbyqxmd.com/read/29145092/ionic-liquid-solvent-bar-micro-extraction-of-cdcln-n-2-species-for-ultra-trace-cd-determination-in-seawater
#6
Belén Herce-Sesa, José A López-López, Carlos Moreno
Water analysis of trace metals has been benefited by recent studies on sample preparation by liquid micro-extraction. However, there are still limitations for its application to seawater, such as the need of additives to preserve the sample or the availability of chemical extractants for the selective extraction from highly saline samples. In this work, a three phase solvent bar micro-extraction (3SBME) system containing the ionic liquid trioctylmethylammonium chloride (Aliquat(®) 336) has been used for isolation and pre-concentration of Cd from seawater samples, due to its ability for ionic exchange of CdCln((n-2)-)...
November 1, 2017: Chemosphere
https://www.readbyqxmd.com/read/29145088/phosphorus-recovery-and-leaching-of-trace-elements-from-incinerated-sewage-sludge-ash-issa
#7
Le Fang, Jiang-Shan Li, Ming Zhi Guo, C R Cheeseman, Daniel C W Tsang, Shane Donatello, Chi Sun Poon
Chemical extraction of phosphorus (P) from incinerated sewage sludge ash (ISSA) is adversely influenced by co-dissolution of metals and metalloids. This study investigated P recovery and leaching of Zn, Cu, Pb, As and Ni from ISSA using inorganic acids (sulphuric acid and nitric acid), organic acids (oxalic acid and citric acid), and chelating agents (ethylenediaminetetraacetic acid (EDTA) and ethylene diamine tetramethylene phosphonate (EDTMP)). The aim of this study was to optimize a leaching process to recover P-leachate with high purity for P fertilizer production...
November 8, 2017: Chemosphere
https://www.readbyqxmd.com/read/29145059/binding-of-naringin-and-naringenin-with-hen-egg-white-lysozyme-a-spectroscopic-investigation-and-molecular-docking-study
#8
Sourav Das, Pooja Ghosh, Sudipta Koley, Atanu Singha Roy
The interactions of naringenin (NG) and naringin (NR) with Hen Egg White Lysozyme (HEWL) in aqueous medium have been investigated using UV-vis spectroscopy, steady-state fluorescence, circular dichroism (CD), Fourier Transform infrared spectroscopy (FT-IR) and molecular docking analyses. Both NG and NR can quench the intrinsic fluorescence of HEWL via static quenching mechanism. At 300K, the value of binding constant (Kb) of HEWL-NG complex (5.596±0.063×10(4)M(-1)) was found to be greater than that of HEWL-NR complex (3...
November 8, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29144983/albumin-coordinated-assembly-of-clearable-platinum-nanodots-for-photo-induced-cancer-theranostics
#9
Yong'an Tang, Tao Yang, Qiaoli Wang, Xiaoyan Lv, Xue Song, Hengte Ke, Zhengqing Guo, Xiaoqing Huang, Jun Hu, Zifu Li, Peng Yang, Xiangliang Yang, Huabing Chen
Photoactive noble metal nanoparticles are of increasing importance toward personalized cancer therapy in the field of precision nanomedicine. A critical challenge remains in the exploration of clinically potential noble metal nanoparticles for highly efficient cancer theranostics. Here, we introduce albumin-coordinated assembly of clearable Pt nanodots (Pt-NDs) with monodisperse nanostructure as high-performance theranostic agents for imaging-guided photothermal tumor ablation. We precisely manipulate the reduction and growth of tetravalent Pt ions into ultrasmall nanodots through albumin-directed growth kinetics, thereby leading to the synthesis of monodisperse 6...
October 20, 2017: Biomaterials
https://www.readbyqxmd.com/read/29144751/dendrimer-stabilized-metal-nanoparticles-as-efficient-catalysts-for-reversible-dehydrogenation-hydrogenation-of-n-heterocycles
#10
Christophe V Deraedt, Rong Ye, Walter Ralston, F Dean Toste, Gabor A Somorjai
Nanoparticles (Pd, Pt, Rh) stabilized by G4OH PAMAM dendrimers and supported in SBA-15 (MNPs/SBA-15 with M= Pd, Pt, Rh) were efficiently used as catalysts in the acceptorless dehydrogenation of tetrahydroquinoline/indoline derivatives in toluene (release of H2) at 130 °C. These catalysts are air stable, very active, robust, and recyclable during the process. The reverse hydrogenation reaction of quinoline derivatives (H2 storage) was also optimized and successfully performed in presence of the same catalysts in toluene at 60 °C under only 1 atmosphere of hydrogen gas...
November 16, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29144747/structural-variability-of-4f-and-5f-thiocyanate-complexes-and-dissociation-of-uranium-iii-thiocyanate-bonds-with-increased-ionicity
#11
Saptarshi Biswas, Shuwen Ma, Stefano Nuzzo, Brendan Twamley, Andrew T Russell, James A Platts, František Hartl, Robert J Baker
A series of complexes [Et4N][Ln(NCS)4(H2O)4] (Ln = Pr, Tb, Dy, Ho, Yb) have been structurally characterized, all showing the same structure, namely a distorted square antiprismatic coordination geometry, and the Ln-O and Ln-N bond lengths following the expected lanthanide contraction. When the counterion is Cs(+), a different structural motif is observed and the eight-coordinate complex Cs5[Nd(NCS)8] isolated. The thorium compounds [Me4N]4[Th(NCS)7(NO3)] and [Me4N]4[Th(NCS)6(NO3)2] have been characterized, and high coordination numbers are also observed...
November 16, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/29144744/partially-oxidized-sns2-atomic-layers-achieving-efficient-visible-light-driven-co2-reduction
#12
Xingchen Jiao, Xiaodong Li, Xiuyu Jin, Yongfu Sun, Jiaqi Xu, Liang Liang, Huanxin Ju, Junfa Zhu, Yang Pan, Wensheng Yan, Yue Lin, Yi Xie
Unraveling the role of surface oxide on affecting its native metal disulfide' CO2 photoreduction remains a grand challenge. Herein, we initially construct metal disulfide atomic layers and hence deliberately create oxidized domains on their surfaces. As an example, SnS2 atomic layers with different oxidation degrees are successfully synthesized. In situ FTIR spectra disclose the COOH* radical is the main intermediate, while density-functional-theory calculations reveal the COOH* formation is the rate-limiting step...
November 16, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29144735/removal-of-pb-ii-ion-using-pamam-dendrimer-grafted-graphene-and-graphene-oxide-surfaces-a-molecular-dynamics-study
#13
Anitha Kommu, Vasumathi Velachi, M Natalia Dias Soeiro Cordeiro, Jayant Kumar Singh
The dendrimer polyamidoamine (PAMAM) has been widely applied in environmental applications as adsorbents for wastewater treatment. In this work, molecular dynamics simulations are conducted to understand the effect of dendrimer grafted graphene and graphene oxide on the structural and dynamical properties of Pb2+ ion. The adsorption capacity of the metal ion is improved significantly, over 60%, using carboxyl terminal groups of dendrimer molecule grafted on graphene oxide surface. We examine the self-diffusion coefficient and residence time of Pb2+ ion near graphene and graphene oxide surfaces grafted with PAMAM dendrimers using terminal groups, -COO- and -OH...
November 16, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/29144734/physically-unclonable-cryptographic-primitives-by-chemical-vapor-deposition-of-layered-mos2
#14
Abdullah Alharbi, Darren Armstrong, Somayah Alharbi, Davood Shahrjerdi
Physically unclonable cryptographic primitives are promising for securing the rapidly growing number of electronic devices. Here, we introduce a new class of physically unclonable primitives from layered molybdenum disulfide (MoS2) by leveraging the natural randomness of their island growth during chemical vapor deposition (CVD). We synthesize a MoS2 monolayer film covered with speckles of multilayer islands, where the growth process is engineered for an optimal speckle density. Using the Clark-Evans test, we confirm that the distribution of islands on the film exhibits complete spatial randomness, hence indicating the growth of multilayer speckles is a spatial Poisson process...
November 16, 2017: ACS Nano
https://www.readbyqxmd.com/read/29144731/zwitterionic-manganese-and-gadolinium-metal-organic-frameworks-as-efficient-contrast-agents-for-in-vivo-magnetic-resonance-imaging
#15
Liang Qin, Zi-Yan Sun, Kai Cheng, Shu-Wen Liu, Jian-Xin Pang, Li-Ming Xia, Wen-Hua Chen, Zhen Cheng, Jin-Xiang Chen
Two water-stable three-dimensional Mn- and Gd-based metal-organic frameworks (MOFs), {[Mn2(Cmdcp)2(H2O)2]·H2O}n (1) and {[Gd(Cmdcp)(H2O)3](NO3)·3H2O}n (2, H3CmdcpBr = N-(4-carboxy benzyl)-(3,5-dicarboxyl)pyridinium bromide), have been prepared and analyzed. In vitro magnetic resonance imaging indicated that MOFs 1 and 2 possess relaxivity r1 values of 17.50 and 13.46 mM(-1)·S(-1), respectively, which are superior to that of the control Gd-DTPA (r1 = 4.87 mM(-1)·S(-1), DTPA = diethylene triamine pentaacetate)...
November 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29144729/an-optical-nanoantenna-for-single-molecule-based-detection-of-zika-virus-nucleic-acids-without-molecular-multiplication
#16
Sarah Elisabeth Ochmann, Carolin Vietz, Kateryna Trofymchuk, Guillermo P Acuna, Birka Lalkens, Philip Tinnefeld
Due to the limited signal-to-background ratio, molecular diagnostics requires molecular amplification of the target molecules or molecular signal amplification after target recognition. For direct molecular detection, we demonstrate a purely physical fluorescence enhancement process which can elevate the fluorescence signal of single fluorescent dyes by several orders of magnitude. To this end, DNA origami-based optical antennas with a height of around 125 nm are used, which utilize metallic nanoparticles to create a hotspot where fluorescence signals are enhanced by plasmonic effects...
November 16, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29144722/transport-across-heterointerfaces-of-amorphous-niobium-oxide-and-crystallographically-oriented-epitaxial-germanium
#17
Mantu K Hudait, Michael Brian Clavel, Jheng-Sin Liu, Aheli Ghosh, Nikhil Jain, Robert J Bodnar
Due to the high carrier mobility of germanium (Ge) and high dielectric permittivity of amorphous niobium pentoxide (a-Nb2O5), Ge/a-Nb2O5 heterostructures offer several advantages for the rapidly developing field of oxide-semiconductor-based multifunctional devices. To this end, we investigation the growth, structural, band alignment, and metal-insulator-semiconductor (MIS) electrical properties of physical vapor deposited Nb2O5 on crystallographically oriented (100)Ge, (110), and (111)Ge epilayers. The as-deposited Nb2O5 dielectrics were found to be in the amorphous state, demonstrating an abrupt oxide/semiconductor heterointerface with respect to Ge, when examined via low- and high-magnification cross-sectional transmission electron microscopy...
November 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29144606/mesoporous-nickel-and-cobalt-based-oxides-nanorods-catalytic-effects-on-improving-libh4-dehydrogenation-properties
#18
Lei Zang, Qiuyu Zhang, Li Li, Yike Huang, Xiaoya Chang, Lifang Jiao, Huatang Yuan, Yijing Wang
Lithium borohydride (LiBH4) with a theoretical hydrogen storage capacity of 18.5 wt% has attracted intense interest as a high-density hydrogen storage material. However, high dehydrogenation temperatures and limited kinetics restrict its practical applications. In this study, the mesoporous nickel- and cobalt-based oxides nanorods (NiCo2O4, Co3O4 and NiO) were controlled synthesized by hydrothermal method and mixed with LiBH4 by ball milling. It is found that the dehydrogenation properties of LiBH4 are remarkably enhanced by doping the as-synthesized metal oxides nanorods...
November 16, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29144431/bioabsorption-and-bioaccumulation-of-cadmium-in-the-straw-and-grain-of-maize-zea-mays-l-in-growing-soils-contaminated-with-cadmium-in-different-environment
#19
Jorge Retamal-Salgado, Juan Hirzel, Ingrid Walter, Iván Matus
There is a worldwide increase of heavy metal or potentially toxic element (PTE), contamination in agricultural soils caused mainly by human and industrial action, which leads to food contamination in crops such as in maize. Cadmium (Cd) is a PTE often found in soils and it is ingested through food. It is necessary to determine the bioabsorption, distribution, and accumulation levels in maize to reduce or prevent food chain contamination. Cadmium absorption and accumulation in three maize cultivars were evaluated in three agricultural environments in Chile by increasing CdCl₂ rates (0, 1, and 2 mg·kg(-1))...
November 16, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29144428/resistance-of-magnesium-alloys-to-corrosion-fatigue-for-biodegradable-implant-applications-current-status-and-challenges
#20
REVIEW
R K Singh Raman, Shervin Eslami Harandi
Magnesium (Mg) alloys are attracting increasing interest as the most suitable metallic materials for construction of biodegradable and bio-absorbable temporary implants. However, Mg-alloys can suffer premature and catastrophic fracture under the synergy of cyclic loading and corrosion (i.e., corrosion fatigue (CF)). Though Mg alloys are reported to be susceptible to CF also in the corrosive human body fluid, there are very limited studies on this topic. Furthermore, the in vitro test parameters employed in these investigations have not properly simulated the actual conditions in the human body...
November 16, 2017: Materials
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