scholarly journals Reactions of o,o′-Dihydroxy Azo Dyes with the Third Group M(III) Ions: A Spectroscopic and Electrochemical Study

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Solomiya Pysarevska ◽  
Liliya Dubenska ◽  
Ivan Spanik ◽  
Jaroslav Kovalyshyn ◽  
Sofia Tvorynska
Keyword(s):  
Metal Ions ◽  
Azo Dyes ◽  
Reduction Peak ◽  
Ir Spectrometry ◽  
Eriochrome Black T ◽  
The Third ◽  
Linear Behavior ◽  
Hydroxy Groups ◽  
Voltammetric Methods ◽  
Second Peak

The reactions of some metal ions of the third group (M(III)) with azo dyes were studied. Attention was focused on azo dyes with two hydroxy groups inortho-positions to azo group: eriochrome red B (ERB), eriochrome black T (EBT), eriochrome blue SE (EBSE), calcon (Calc), and kalces (KLC). The chelation is responsible for interaction of these dyes with Al(III), Sc(III), rare earth elements (REE) ions, Ga(III), and In(III). The complexes were studied using vis- and IR-spectrometry. One irreversible peak (P1) of complexes reduction was observed on voltammograms for all studied metal ions. The second peak P2 was observed only for Ga complexes with all investigated azo dyes. Based on the study, the possible mechanism of complexes reduction was proposed. Linear behavior has been found between the reduction peak currents of a set of metal complexes and the concentration of the respective metal cations. This can be used for metal ions determination by voltammetric methods.

scholarly journals Subcellular structure of bovine thyroid gland. The localization of the peroxidase activity in bovine thyroid

1978 ◽  
Vol 174 (3) ◽  
pp. 939-949 ◽  
Author(s):  
M J S De Wolf ◽  
A R Lagrou ◽  
H J J Hilderson
Keyword(s):  
Peroxidase Activity ◽  
Buoyant Density ◽  
Thyroid Tissue ◽  
Guaiacol Peroxidase ◽  
Subcellular Structure ◽  
The Third ◽  
Bovine Thyroid ◽  
Two Peaks ◽  
Second Peak ◽  
Membranous Material

1. After differential pelleting of bovine thyroid tissue the highest relative specific activities for plasma membrane markers are found in the L fraction whereas those for peroxidase activities (p-phenylenediamine, guaiacol and 3,3′-diaminobenizidine tetrachloride peroxidases) are found in the M fraction. 2. When M + L fractions were subjected to buoyant-density equilibration in a HS zonal rotor all peroxidases show different profiles. The guaiacol peroxidase activity always follows the distribution of glucose 6-phosphatase. 3. When a Sb fraction is subjected to Sepharose 2B chromatography three major peaks are obtained. The first, eluted at the void volume, consists of membranous material and contains most of the guaiacol peroxidase activity. Most of the protein (probably thyroglobulin) is eluted with the second peak. Solubilized enzymes are recovered in the third peak. 4. p-Phenylenediamine peroxidase activity penetrates into the gel on polyacrylamidegel electrophoresis, whereas guaiacol peroxidase activity remains at the sample zone. 5. DEAE-Sephadex A-50 chromatography resolves the peroxidase activities into two peaks, displaying different relative amounts of the different enzymic activities in each peak. 6. The peroxidase activities may be due to the presence of different proteins. A localization of guaiacol peroxidase in rough-endoplasmic-reticulum membranes (or in membranes related to them) seems very likely.

scholarly journals Study on The Third-Order NLO Properties of Trace Metal Ions in Nitric Acid Solution by Closed-Aperture Z-scan Technique

2020 ◽  
Vol 1484 ◽  
pp. 012005
Author(s):  
Muhammad Izz Rosli ◽  
Afiq Awalludin ◽  
Maisarah Duralim ◽  
Mundzir Abdullah ◽  
Muhammad Safwan Abd Aziz
Keyword(s):  
Nitric Acid ◽  
Acid Solution ◽  
Trace Metal ◽  
Metal Ions ◽  
Nitric Acid Solution ◽  
Closed Aperture ◽  
Third Order ◽  
Nlo Properties ◽  
Trace Metal Ions ◽  
The Third

Sequence Structure of Styrene-Butadiene Copolymer Determined by Ozonolysis-HPLC Method

1987 ◽  
Vol 60 (2) ◽  
pp. 207-216 ◽  
Author(s):  
Yasuyuki Tanaka ◽  
Yasunobu Nakafutami ◽  
Yasushi Kashiwazaki ◽  
Junichi Adachi ◽  
Kaoru Tadokoro
Keyword(s):  
13C Nmr ◽  
Hplc Method ◽  
Nmr Analysis ◽  
Sequence Structure ◽  
1H And 13C Nmr ◽  
The Third ◽  
13C Nmr Analysis ◽  
Styrene Butadiene ◽  
Styrene Unit ◽  
Second Peak

Abstract The configurational sequence of styrene units and the arrangement of styrene and 1,2-butadiene units in styrene-butadiene copolymers were characterized by 1H- and 13C-NMR analysis of the ozonolysis products which were separated by a combination of GPC and HPLC. The ozonolysis products from diad and triad styrene sequences flanked by 1,4-butadiene units showed two and three peaks in HPLC, respectively, reflecting the diad and triad tacticity. The probability of racemic addition was found to be 0.56 and 0.58 for radical and anionic SBR, respectively. The ozonolysis products from styrene-1,2 sequences were separated into three fractions by HPLC. The first and second fractions were assigned to a 1,4-1,2 styrene-1,4 (VS) structure differed only in cotacticity. The third fraction was considered to be a mixture of the meso and racemic forms of the l,4-styrene-l,2-l,4 (SV) sequence. The GPC fraction corresponding to a sequence consisting of two styrenes and one 1,2 units was separated into four peaks by HPLC. Both large peaks contained SSV + VSS structures, where one peak consisted of meso configurations with respect to the two styrene units, and the second peak contained racemic styrene alignments. The two small peaks were SVS with the separation due to cotacticity. Based on the intensity of HPLC peaks, it was deduced that the addition of a 1,2 unit after the styrene terminal predominated the addition of a styrene unit after the 1,2 terminal.

scholarly journals Effect of Sr-P Interaction on the Microstructure and Tensile Properties of A413.0 Type Alloys

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
A. M. Samuel ◽  
H. W. Doty ◽  
S. Valtierra ◽  
F. H. Samuel
Keyword(s):  
Heat Treatment ◽  
Tensile Properties ◽  
Solution Heat Treatment ◽  
Eutectic Silicon ◽  
Low Magnesium ◽  
The Third ◽  
Wide Range ◽  
Eutectic Si ◽  
Second Peak ◽  
Silicon Particles

The present study was performed on low magnesium A413.0 type alloys. The results show that strontium (Sr) is mainly concentrated in the silicon particles. Overmodification occurs when Sr precipitates in the form of Al2SrSi2, which takes place over a wide range of temperatures. The first peak occurs following the precipitation ofα-Al, the second peak is merged with the precipitation of eutectic silicon (Si), and the third peak is a posteutectic reaction. Introduction of phosphorus (P) to Sr-modified alloys leads to the formation of (Al,P,Sr)2O5compound, which reduces the modification effectiveness of Sr. Therefore, in the presence of P, the amount of added Sr should exceed 200 ppm. For the same levels of P, the tensile parameters of well modified alloys (233 ppm Sr) are relatively higher than those partially modified with Sr (about 60 ppm Sr) containing the same amount of P. During solution heat treatment, coarsening of the eutectic Si particles occurs by the growth of some particles at the expense of the dissolution of the smaller ones, as well as by the collision of nearby particles.

scholarly journals A New Generation of Glycoconjugated Azo Dyes Based on Aminosugars

2015 ◽  
Vol 2015 ◽  
pp. 1-7
Author(s):  
Lorenzo Guazzelli ◽  
Giorgio Catelani ◽  
Felicia D’Andrea
Keyword(s):  
Acid Hydrolysis ◽  
Azo Dyes ◽  
Azo Dye ◽  
Protecting Groups ◽  
Third Generation ◽  
Sugar Moiety ◽  
The Third ◽  
New Generation ◽  
Monoazo Dyes ◽  
Hydrolysis Of

The third generation of glycoconjugated azo dyes (GADs) was prepared linking monoazo dyes to 6-amino-6-deoxy-d-galactose or 6′amino-6′-deoxylactose through mixed amido-ester connections. The complementary conjugation reactions were studied using the succinyl derivative of either the acetal protected aminosugar or the azo dye. Target “naturalized” GADs were obtained after acid hydrolysis of the acetal protecting groups present on the sugar moiety.

Effects of metal ions on the interaction between polyethylenimine and azo dyes carrying hydroxyl groups

1985 ◽  
Vol 23 (1) ◽  
pp. 255-259 ◽  
Author(s):  
Toru Takagishi ◽  
Kiyoaki Yoshikawa ◽  
Sadatsugu Okuda ◽  
Nobuhiko Kuroki ◽  
Hiroshi Kozuka
Keyword(s):  
Metal Ions ◽  
Azo Dyes ◽  
Hydroxyl Groups

The Early Days of Commercial FT-IR Spectrometry: A Personal Perspective

2017 ◽  
Vol 71 (3) ◽  
pp. 329-340 ◽  
Author(s):  
Peter R. Griffiths
Keyword(s):  
Phase Modulation ◽  
Near Infrared ◽  
Michelson Interferometer ◽  
Far Infrared ◽  
Personal Perspective ◽  
Ir Spectrometry ◽  
The Third ◽  
Scan Speed ◽  
Ft Ir ◽  
Very High

The development of Fourier transform infrared (FT-IR) spectrometers in the mid-1960s followed along three lines. Interferometers for far-infrared FT spectrometry typically had a slow scan speed and the beam of radiation was modulated by a rotating chopper. Several instruments based on this system were developed commercially. Very high-resolution near-infrared FT spectrometers were based on cats-eye retroreflectors mounted in a step-scan interferometer; the beam of radiation was usually modulated by dithering one of the cats-eyes (phase modulation). No commercial instruments based on this principle were developed. In the third type of FT spectrometer, the beam was modulated by rapidly scanning one of the mirrors of a Michelson interferometer. While the early instruments based on this principle only gave rise to low-resolution spectra, the incorporation of laser fringe referencing at the end of the decade led to instruments that were the fore-runners of contemporary FT-IR spectrometers. In this article, the author’s experiences with instruments of the first and third category are described.

Metal ion binding of the third and fourth domains of Slc11a1 in a model membrane

RSC Advances ◽  
2016 ◽  
Vol 6 (90) ◽  
pp. 87270-87272
Author(s):  
Haiyan Qi ◽  
Wanxia Tang ◽  
Liming Bai ◽  
Lidi Gao
Keyword(s):  
Metal Ions ◽  
Metal Ion ◽  
Model Membrane ◽  
Transmembrane Domains ◽  
Model Membranes ◽  
Differential Scanning Calorimetric ◽  
Ion Binding ◽  
Metal Ion Binding ◽  
The Third

In this paper, differential scanning calorimetric (DSC) experiments have shown that the ability of third and fourth transmembrane domains of Slc11a1 to perturb DMPC model membranes is affected by metal ions.

Patterns of Eimeria excretion in young Icelandic calves

2021 ◽  
Vol 34 ◽  
pp. 29-39
Author(s):  
Charlotta Oddsdóttir ◽  
Guðný Rut Pálsdóttir
Keyword(s):  
Risk Factors ◽  
Eimeria Species ◽  
Dairy Farms ◽  
Oocyst Excretion ◽  
The Third ◽  
Faecal Samples ◽  
Eimeria Spp ◽  
Faecal Consistency ◽  
Second Peak ◽  
Eimeria Infection

Faecal samples were collected from a total of 11 calves on three dairy farms (four from two farms and three from one) where calves generally thrive well and no anti-coccidial treatment is habitually carried out. One of the farms keeps calves in groups on hay/straw bedding, one keeps calves in pairs on plastic slats and then in groups on concrete slats, and the third one keeps calves in groups on concrete slats. Faecal consistency and the total number of Eimeria spp. oocysts per gram faeces (OPG) were determined and species identification was carried out by morphology. Eimeria oocysts were detected in all calves at some point of the study period, and diarrhoea was seen in 55% of the calves. The highest peak in oocyst excretion was 69,300 OPG. The first peak in oocyst excretion was seen 2-3 weeks after calves had been moved to group pens, and a second peak was seen 2-3 weeks later. Nine Eimeria species were found, including E. bovis and E. zuernii. The results are in accordance with previous studies showing that one of the risk factors for Eimeria infection in calves is entering a group pen where older calves are already being kept.

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