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Items from 1 to 20 out of 2,602 results

article

Highly sensitive and selective colorimetric probe for determination of l-cysteine in aqueous media based on Ag/Pd bimetallic nanoparticles

Khalil Farhadi, Mehrdad Forough, Atefeh Pourhossein, Rahim Molaei, more

Sensors & Actuators: B. Chemical > 2014 > 202 > Complete > 993-1001

The interaction between Ag/Pd bimetallic nanoparticles and cysteine was introduced as a new and high potential colorimetric probe for the selective, sensitive and low-cost recognition and monitoring of cysteine in aqueous samples. In the presence of NaCl, cysteine was able to induce the aggregation of Ag/Pd bimetallic nanoparticles thereby resulting in a change in yellowish-brown color of the Ag/Pd...

article

Pressemitteilungen 2.0 – eine Resonanzanalyse im Internet

Wolfgang Schweiger, Katrin Jungnickel

Publizistik > 2011 > 56 > 4 > 399-421

Die Entwicklung des Social Web ermöglicht es Unternehmen und Organisationen, mit ihrer Online-PR nicht mehr nur die Massenmedien zu erreichen, sondern direkt mit ihren Anspruchsgruppen zu kommunizieren. Das gilt auch für das ursprünglich rein auf die Medienarbeit ausgerichtete Instrument der Pressemitteilung. Die Studie untersucht mit einer Input-Output-Inhaltsanalyse in der Tradition der Determinationsforschung,...

article

Entscheidungsverhalten im Gesundheitssport

Stefan Krause

German Journal of Exercise and Sport Research > 2009 > 39 > 2 > 129-136

Bei der Suche nach den Determinanten von Entscheidungsverhalten überwogen lange Jahre kognitive Aspekte, während in der letzten Zeit zunehmend auch die emotionalen Komponenten in den Fokus wissenschaftlicher Betrachtungen gelangten. Angesichts der immer wieder aufflammenden und nicht nur philosophisch relevanten Diskussion über die Willensfreiheit und die Architektur unseres Geistes stellt sich die...

article

Pedicle and first antler formation in deer: Anatomical, histological, and developmental aspects

U. Kierdorf, H. Kierdorf

European Journal of Wildlife Research > 2002 > 48 > 1 > 22-34

Summary Formation of primary cranial appendages (pedicles and first antlers) in deer is initiated by a specialized periosteum, for whichGoss (1983) introduced the term antlerogenic periosteum. The antlerogenic periosteum (AP) is located on the external frontal crests, this area of the deer skull most likely being of neural crest origin. As was discovered byHartwig (1968b) andHartwig andSchrudde (1974),...

article

Sensitive CE‐MS method for monitoring of riociguat and desmethylriociguat levels in human serum

Tomáš Hložek, Martin Štícha, Miroslava Bursová, Ivan Jelínek, more

ELECTROPHORESIS > 41 > 18-19 > 1564 - 1567

Riociguat is novel antihypertensive drug for treatment of pulmonary hypertension. As such, it is still being tested in many clinical and pharmacokinetic trials. Existing methods that determine serum riociguat and desmethylriociguat (DMR) are based solely on liquid chromatography with mass spectrometry. Therefore, we present a novel capillary electrophoresis with mass spectrometry method (CE‐MS) for...

article

Development of an extraction procedure and analysis of electrostatically stabilized silanates from aqueous solutions

Joanna Jabłońska, Mariusz Kluska, Nikolai Erchak, Stanisław Popiel

Oceanological and Hydrobiological Studies > 2020 > Vol. 49, No. 3 > 247--254

The analyzed organosilicon derivatives of electrostatically stabilized silanates belong to a group of pentacoordinated compounds. These derivatives are:1-(N-morpholiniomethyl)spirobi(1-sila-2,5-dioxacyclopentan-3-on)at,1-(N-morpholiniomethyl)spirobi(1-sila-2,5-dioxa-4-methylcyclopentan-3-on)at,1-(N-morpholiniomethyl)spirobi(1-sila-2,5-dioxa-4-(i-propyl)cyclopentan-3-on)at. In the course of the work,...

article

Synthesis of Cysteine Modified MoS₂ Nanocomposite: A Biocompatible Electrochemical Sensor Material and its Application to the Determination of Antidiabetic Dapagliflozin

Ali Kemal Ateş, Hüseyin Çelikkan, Nevin Erk

Electroanalysis > 32 > 7 > 1480 - 1487

Herein, for the first time, a new generation cysteine modified MoS₂ (Cys@MoS₂) based electrochemical sensor was reported. The electrochemical behaviour of dapagliflozin (DAP) was investigated through differential pulse voltammetry (DPV) on the developed sensor (Cys@MoS₂/GCE). The transmission electron microscopy (TEM), fourier transform infrared spectroscopy (FTIR), x‐ray diffraction spectroscopy...

article

Fabrication of novel Ag/g‐C₃N₄ electrode for resveratrol sensors

Zhen Zhu, Tzu‐Ying Pan, Chia‐Ying Hsieh, Ren‐Jang Wu

Journal of the Chinese Chemical Society > 67 > 7 > 1195 - 1200

Ag/g‐C₃N₄ is fabricated and used as an electrode for determining trans‐resveratrol concentration. The compositional and structural characteristics of the as‐fabricated Ag/g‐C₃N₄ are studied through X‐ray diffraction, transmission electron microscopy, and energy dispersive spectroscopy. Additionally, the electrochemical behavior of Ag/g‐C₃N₄ is investigated using cyclic voltammetry. According to the...

article

Sensitive Anodic Stripping Voltammetric Copper Ions Determination Performed in Double Deposition and Double Stripping Steps System for Real Water Samples Analysis

Iwona Gęca, Mateusz Ochab

Electroanalysis > 32 > 6 > 1364 - 1369

The article reports on utilization of double deposition and stripping steps for increasing sensitivity of Cu(II) determination by anodic stripping voltammetry (ASV) at two lead film working electrodes. A significant preconcentration of copper was achieved thanks to utilization of a simple design of four electrodes system that gives possibility to perform one measurement cycle consisting of two deposition...

article

Quantitative determination of rifampicin in aquatic products by stable isotope‐dilution high liquid chromatography–tandem mass spectrometry

Qin Li, Jingyuan Cao, Gang Han, Huan Liu, more

Biomedical Chromatography > 34 > 5 > n/a - n/a

Rifampicin is a semi‐synthetic broad‐spectrum antibiotic obtained from rifamycin B. It is one of the most effective first‐line antituberculosis drugs and is widely used in clinical practice. In the present study, we describe a rapid and sensitive method for the determination of rifampin in aquatic products by stable isotope‐dilution high liquid chromatography–tandem mass spectrometry (HPLC–MS/MS)...

article

Simultaneous determination of 22 residual steroid hormones in milk by liquid chromatography–tandem mass spectrometry

Shenghua He, Rongchun Wang, Wei Wei, Haiyan Liu, more

International Journal of Dairy Technology > 73 > 2 > 357 - 365

Food safety and consumers’ health are paramount; therefore, it is essential to establish a novel method to determine hormone content in milk. Herein, a novel method was developed that can simultaneously determine 22 residual steroid hormones in milk. To obtain the maximum detection sensitivity, the preparation method of sample, mass spectrometer parameters and liquid chromatography conditions were...

article

Sensitive Determination of Folic Acid using a Solid Bismuth Microelectrode by Adsorptive Stripping Voltammetry

Iwona Gęca, Mieczyslaw Korolczuk

Electroanalysis > 32 > 3 > 496 - 502

An adsorptive stripping voltammetric procedure of folic acid determination with the use of a new voltammetric sensor with a prolonged application‐solid bismuth microelectrode was described. The proposed microelectrode is characterized by more eco‐friendly properties as compared to in situ formed bismuth film electrodes due to the fact that bismuth ions are not needed as a component of supporting electrolyte...

article

Serum metabolite profiling of ST‐segment elevation myocardial infarction using liquid chromatography quadrupole time‐of‐flight mass spectrometry

Gulsah Gundogdu, Onur Senol, Fatma Demirkaya Miloglu, Yavuzer Koza, more

Biomedical Chromatography > 34 > 2 > n/a - n/a

ST segment elevation myocardial infarction (STEMI) is one of the most common global causes of cardiovascular disease‐related death. Several metabolites may change during STEMI. Hence, analysis of metabolites in body fluid may be considered as a rapid and accurate test for initial diagnosis. This study has therefore attempted to determine the variation in metabolites identified in the serum of STEMI...

article

Zastosowanie technik łączonych w oznaczaniu i identyfikacji antybiotyków i mikroorganizmów

Katarzyna Pauter, Małgorzata Szultka-Młyńska, Wojciech Kupczyk, Bogusław Buszewski

Analityka : nauka i praktyka > 2020 > nr 1 > 24--31

Zastosowanie technologii MALDI i technik elektromigracyjnych w analizie mikrobiologicznej może stać się kamieniem milowym w diagnostyce i analizie zakażeń.

article

Starch-iodine assay method underestimates alpha-amylase inhibitory potential of antioxidative compounds and extracts

C.J. Ononamadu, O.C. Ezeigwe, T.A. Owolarafe, G.O. Ihegboro, more

BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology > 2020 > 101 > 1

article

Protein-Based Nanobiosensor for Electrochemical Determination of Hydrogen Peroxide

Z. Tamleh, R. Rafipour, S. Kashanian

Russian Journal of Electrochemistry > 2019 > 55 > 10 > 962-969

We designed a hydrogen peroxide biosensor. The electrochemical detection of H₂O₂ was performed based on immobilization of cobalt nanoparticles–ferritin (CoNPs–Fer) onto multiwalled carbon nanotubes (MWCNTS) ensnared into chitosan (CS) matrices. Electrochemical techniques such as differential pulse voltammetry (DPV) and cyclic voltammetry (CV) was used to check the property of biosensor. Energy-dispersive...

article

Sensitive Simultaneous Determination of Rutin and Folic Acid with the Use of a Solid Lead Electrode by Means of Adsorptive Stripping Voltammetry

Mateusz Ochab, Iwona Gęca, Mieczyslaw Korolczuk

Electroanalysis > 31 > 11 > 2206 - 2213

In this article a solid lead electrode (PbE) was utilized for the first time for determination of organic substances by means of adsorptive stripping voltammetry. A new procedure of simultaneous determination of rutin and folic acid was developed. Two well shaped and well separated reduction signals of rutin and folic acid were obtained with the use of PbE. The optimization of analytical procedure...

article

The Most Reliable and Precise Model to Determine Schottky Barrier Height and Photoelectron Yield Spectroscopy

Liu Changshi

Optical and Quantum Electronics > 2019 > 51 > 11 > 1-8

Schottky barrier height (SBH), $$\varphi$$ φ , plays a crucial role in the design of electronic and photo-electronic devices. In order to reckon SBH via internal photoemission (IPE), the technique is through extrapolating square root of IPE yield-and cube root of IPE yield-photon energy plots to zero before this work, this work was motivated by the most reliable and precise model to determine the...

article

Determination of steroid esters in hair of slaughter animals by liquid chromatography with tandem mass spectrometry

I. Matraszek-Zuchowska, B. Wozniak, K. Sielska, A. Posyniak

Journal of Veterinary Research > 2019 > 63 > 4

article

The new Micro‐set for Adsorptive Stripping Voltammetric Simultaneous Determination of Nickel and Cobalt Traces in Aqueous Media

Mateusz Ochab, Iwona Gęca, Mieczyslaw Korolczuk

Electroanalysis > 31 > 9 > 1769 - 1774

This article the first reports on a fabrication and application of an electrochemical three electrode micro‐set containing: in situ plated lead film on carbon fiber working microelectrode, Ag/AgCl reference electrode and a platinum wire counter electrode placed in one casing for simultaneous Ni(II) and Co(II) traces determination by square wave adsorptive stripping voltammetry (SW AdSV). Ni(II) and...

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Search results

Highly sensitive and selective colorimetric probe for determination of l-cysteine in aqueous media based on Ag/Pd bimetallic nanoparticles

Pressemitteilungen 2.0 – eine Resonanzanalyse im Internet

Entscheidungsverhalten im Gesundheitssport

Pedicle and first antler formation in deer: Anatomical, histological, and developmental aspects

Sensitive CE‐MS method for monitoring of riociguat and desmethylriociguat levels in human serum

Development of an extraction procedure and analysis of electrostatically stabilized silanates from aqueous solutions

Synthesis of Cysteine Modified MoS₂ Nanocomposite: A Biocompatible Electrochemical Sensor Material and its Application to the Determination of Antidiabetic Dapagliflozin

Fabrication of novel Ag/g‐C₃N₄ electrode for resveratrol sensors

Sensitive Anodic Stripping Voltammetric Copper Ions Determination Performed in Double Deposition and Double Stripping Steps System for Real Water Samples Analysis

Quantitative determination of rifampicin in aquatic products by stable isotope‐dilution high liquid chromatography–tandem mass spectrometry

Simultaneous determination of 22 residual steroid hormones in milk by liquid chromatography–tandem mass spectrometry

Sensitive Determination of Folic Acid using a Solid Bismuth Microelectrode by Adsorptive Stripping Voltammetry

Serum metabolite profiling of ST‐segment elevation myocardial infarction using liquid chromatography quadrupole time‐of‐flight mass spectrometry

Zastosowanie technik łączonych w oznaczaniu i identyfikacji antybiotyków i mikroorganizmów

Starch-iodine assay method underestimates alpha-amylase inhibitory potential of antioxidative compounds and extracts

Protein-Based Nanobiosensor for Electrochemical Determination of Hydrogen Peroxide

Sensitive Simultaneous Determination of Rutin and Folic Acid with the Use of a Solid Lead Electrode by Means of Adsorptive Stripping Voltammetry

The Most Reliable and Precise Model to Determine Schottky Barrier Height and Photoelectron Yield Spectroscopy

Determination of steroid esters in hair of slaughter animals by liquid chromatography with tandem mass spectrometry

The new Micro‐set for Adsorptive Stripping Voltammetric Simultaneous Determination of Nickel and Cobalt Traces in Aqueous Media

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