Search results for "nuclear chemistry"

Caries arresting effect of silver diamine fluoride on dentine carious lesion with S. mutans and L. acidophilus dual-species cariogenic biofilm

2013

OBJECTIVES: This in vitro study investigated the effects of silver diamine fluoride (SDF) on dentine carious lesion with cariogenic biofilm. STUDY DESIGN: Thirty human dentine blocks were inoculated with Streptococcus mutans and Lactobacillus acidophilus dual-species biofilm to create carious lesion. They were equally divided into test and control group to receive topical application of SDF and water. After incubation anaerobically using micro-well plate at 37oC for 7 days, the biofilms were evaluated for kinetics, morphology and viability by colony forming units (CFU), scanning electron microscopy (SEM), and confocal microscopy (CLSM), respectively. The carious lesion underwent crystal cha…

Comparison of thermal‐ and photo‐polymerization of lauryl methacrylate monolithic columns for CEC

2009

Lauryl methacrylate-based (LMA) monolithic columns for CEC, prepared using either thermal initiation or by UV-irradiation in the presence of AIBN have been compared. Thermal polymerization was carried out at 70 degrees C for 20 h. For UV initiation, the effects of the time exposure to UV light and irradiation energy were investigated. For each initiation process, the influence of composition of porogenic solvent (1,4-butanediol/1-propanol ratio) on the physical and electrochromatographic properties of the resulting monoliths was also evaluated. Photochemically lauryl methacrylate stationary phases initiated showed higher permeabilities and better efficiencies than those prepared by thermal …

Green synthesis of Pd@graphene nanocomposite: Catalyst for the selective oxidation of alcohols

2016

Abstract Due to their excellent physicochemical properties and synergistic effect, graphene metallic NPs based nanocomposites have gained significant attention in various technological fields including catalysis. Here we demonstrate a single pot, facile and environmental friendly synthesis of catalytically active palladium(Pd)@graphene nanocomposites (SP-HRG-Pd) by the simultaneous reduction of graphene oxide (GRO) and PdCl 2 using Salvadora persica L. (miswak) root extract (RE) as bioreductant. The synthesis of SP-HRG-Pd was confirmed by various spectroscopic and microscopic techniques, including ultraviolet–visible (UV–vis), Fourier-transform infrared (FT-IR), Raman and X-ray photoelectro…

Synthesis and antimicrobial screening of tetra Schiff bases of 1,2,4,5-tetra (5-amino-1,3,4-thiadiazole-2-yl)benzene

2014

Abstract In the present study, novel tetra Schiff bases were synthesized by condensation of 1,2,4,5-tetra (5-amino-1,3,4-thiadiazole-2-yl)benzene with different aromatic aldehydes. The chemical structures were confirmed by means of IR, 1 H NMR, 13 C NMR, and elemental analysis. All compounds were screened for antibacterial ( Staphylococcus aureus ATCC-9144, Staphylococcus epidermidis ATCC-155, Micrococcus luteus ATCC-4698, Bacillus cereus ATCC-11778, Escherichia coli ATCC-25922, and Pseudomonas aeruginosa ATCC-2853) and antifungal ( Aspergillus niger ATCC-9029 and Aspergillus fumigatus ATCC-46645) activities by paper disc diffusion technique. The minimum inhibitory concentrations (MICs) of …

FT-IR spectroscopy studies of the breast cancer cell composition changes induced by Au-BSA nanoclusters

2016

Examination of Dyeing Properties on Silk of Some Flavonoids by Spectroscopic Techniques

2019

In this study, the silk fabrics mordanted at the rates of 1%, 2%, 3%, 4%, 6%, 9%, 12%, 14%, 18%, 21%, 24%, 27%, 30%, 33% and 36% of alum (KAl(SO4)2.12H2O) were separately dyed with chrysin, quercet...

Fluoreszenzanalytische bestimmung von sulfidionen im nanogrammbereich

1968

Zusammenfassung Zur Bestimmung von Sulfid im Bereich von 1–10 ng ml wurde eine Methode ausgearbeitet, die auf der Fluoreszenzloschung einer alkalischen Losung von Fluorescein-mercuri-acetat (FMA) durch Sulfid oder andere Schwefelverbindungen beruht. Zur Standardisierung wird eine Diphenylthioharnstofflosung verwendet. Die Standardabweichung fur die Bestimmung von 3,5 ng ml Sulfid war 0,17 ng ml . Die Methode eignet sich zur Bestimmung kleinster Schwefelmengen in organischen Substanzen nach einem hydrierenden Aufschlus.

Tansy fruit mediated greener synthesis of silver and gold nanoparticles

2010

Abstract In this paper we have reported the green synthesis of silver (AgNPs) and gold (AuNPs) nanoparticles by reduction of silver nitrate and chloroauric acid solutions, respectively, using fruit extract of Tanacetum vulgare ; commonly found plant in Finland. The process for the synthesis of AgNPs and AuNPs is rapid, novel and ecofriendly. Formation of the AgNPs and AuNPs were confirmed by surface plasmon spectra using UV–Vis spectrophotometer and absorbance peaks at 452 and 546 nm. Different tansy fruit extract concentration (TFE), silver and gold ion concentration, temperature and contact times were experimented in the synthesis of AgNPs and AuNPs. The properties of prepared nanoparticl…

Über Tetrathiowolframsäure und Tetrathiomolybdänsäure

1966

Durch Behandeln mit einem Kationenaustauscher in der H+-Form werden aus verdunnten wasrigen Losungen von (NH4)2WS4 und (NH4)2MoS4 die entsprechenden freien Sauren hergestellt. Die Tetrathiomolybdansaure ist wesentlich unbestandiger als die Tetrathiowolframsaure.

Zur inversvoltammetrischen Bestimmung des Zinks in Grundlösungen mit Triäthanolamin

1977

Zur inversvoltammetrischen Bestimmung des Zinks werden triathanolaminhaltige Grundlosungen vorgeschlagen. Der Einflus niederschlagbildender Ionen ist in diesen Grundlosungen erheblich herabgesetzt. Arbeitsbedingungen fur die Zinkbestimmung werden angegeben.