Development of highly sensitive analytical methods for radionuclides in marine environmental studies

2006 ◽  
Vol 25 (S1) ◽  
pp. 209-209
Author(s):  
Jian Zheng ◽  
Masatoshi Yamada
Keyword(s):  
Analytical Methods ◽  
Environmental Studies ◽  
Highly Sensitive ◽  
Marine Environmental

Trace metals speciation in coastal particulate matter for marine environmental studies in Antarctica

2005 ◽  
Vol 7 (12) ◽  
pp. 1287 ◽  
Author(s):  
E. Magi ◽  
C. Ianni ◽  
F. Soggia ◽  
M. Grotti ◽  
R. Frache
Keyword(s):  
Particulate Matter ◽  
Trace Metals ◽  
Environmental Studies ◽  
Marine Environmental

Low fouling and ultrasensitive electrochemical immunosensors with dual assay methods based on Fe3O4 magnetic nanoparticles

2019 ◽  
Vol 7 (38) ◽  
pp. 5842-5847 ◽  
Author(s):  
Wenshi Li ◽  
Gao-Chao Fan ◽  
Xiaojian Fan ◽  
Ruiqiao Zhang ◽  
Lei Wang ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Analytical Methods ◽  
Sensitive Detection ◽  
Fe3o4 Magnetic Nanoparticles ◽  
Cancer Antigen ◽  
Electrochemical Immunosensors ◽  
Highly Sensitive ◽  
Assay Methods ◽  
Highly Sensitive Detection

Low fouling electrochemical immunosensors for the highly sensitive detection of cancer antigen 15-3 with both “signal-off” and “signal-on” analytical methods were developed.

scholarly journals Coelenterazine-Dependent Luciferases as a Powerful Analytical Tool for Research and Biomedical Applications

2020 ◽  
Vol 21 (20) ◽  
pp. 7465 ◽  
Author(s):  
Vasilisa V. Krasitskaya ◽  
Eugenia E. Bashmakova ◽  
Ludmila A. Frank
Keyword(s):  
Analytical Methods ◽  
Analytical Tool ◽  
Biological Research ◽  
Research Areas ◽  
Enzyme Substrate ◽  
Highly Sensitive ◽  
Powerful Analytical Tool ◽  
Fundamental Research ◽  
Common Group ◽  
First Time

The functioning of bioluminescent systems in most of the known marine organisms is based on the oxidation reaction of the same substrate—coelenterazine (CTZ), catalyzed by luciferase. Despite the diversity in structures and the functioning mechanisms, these enzymes can be united into a common group called CTZ-dependent luciferases. Among these, there are two sharply different types of the system organization—Ca2+-regulated photoproteins and luciferases themselves that function in accordance with the classical enzyme–substrate kinetics. Along with deep and comprehensive fundamental research on these systems, approaches and methods of their practical use as highly sensitive reporters in analytics have been developed. The research aiming at the creation of artificial luciferases and synthetic CTZ analogues with new unique properties has led to the development of new experimental analytical methods based on them. The commercial availability of many ready-to-use assay systems based on CTZ-dependent luciferases is also important when choosing them by first-time-users. The development of analytical methods based on these bioluminescent systems is currently booming. The bioluminescent systems under consideration were successfully applied in various biological research areas, which confirms them to be a powerful analytical tool. In this review, we consider the main directions, results, and achievements in research involving these luciferases.

scholarly journals 14C Measurements of Tree Rings of a Japanese Cedar During 1945 to 2000 and Core Sampling for Environmental Studies

Radiocarbon ◽  
2007 ◽  
Vol 49 (2) ◽  
pp. 1045-1053 ◽  
Author(s):  
H Kawamura ◽  
H Kofuji ◽  
S Gasa ◽  
M Kamamoto ◽  
N Sawafuji ◽  
...  
Keyword(s):  
20Th Century ◽  
Tree Rings ◽  
Environmental Studies ◽  
Japanese Cedar ◽  
Nuclear Testing ◽  
Local Effects ◽  
Core Sampling ◽  
Radiocarbon Data ◽  
Marine Environmental ◽  
Aomori Prefecture

Japanese cedar rings sampled from Aomori Prefecture, Japan, were measured to obtain tree-ring radiocarbon data covering a period of the latter half of the 20th century in the northernmost area of Honshu (mainland Japan), to obtain records of variation in atmospheric 14C concentration caused by past atmospheric nuclear testing, and to study any possible local effects. This work, carried out on a partial disk, was also intended to provide a reference for data obtained by core sampling of live, standing Japanese black pines as a part of marine environmental studies.

scholarly journals Rapid and Automated Analytical Methods for Redox Species Based on Potentiometric Flow Injection Analysis Using Potential Buffers

2011 ◽  
Vol 2011 ◽  
pp. 1-14 ◽  
Author(s):  
Hiroki Ohura ◽  
Toshihiko Imato
Keyword(s):  
Flow Injection ◽  
Analytical Methods ◽  
Injection Technique ◽  
Selective Electrode ◽  
Redox Species ◽  
Injection Method ◽  
Highly Sensitive ◽  
Bromide Ion ◽  
Oxidative Species

Two analytical methods, which prove the utility of a potentiometric flow injection technique for determining various redox species, based on the use of some redox potential buffers, are reviewed. The first is a potentiometric flow injection method in which a redox couple such as Fe(III)-Fe(II), Fe-Fe(CN), and bromide-bromine and a redox electrode or a combined platinum-bromide ion selective electrode are used. The analytical principle and advantages of the method are discussed, and several examples of its application are reported. Another example is a highly sensitive potentiometric flow injection method, in which a large transient potential change due to bromine or chlorine as an intermediate, generated during the reaction of the oxidative species with an Fe(III)-Fe(II) potential buffer containing bromide or chloride, is utilized. The analytical principle and details of the proposed method are described, and examples of several applications are described. The determination of trace amounts of hydrazine, based on the detection of a transient change in potential caused by the reaction with a Ce(IV)-Ce(III) potential buffer, is also described.

Green Analytical Methods in Analysis of Aflatoxins

2016 ◽  
Vol 842 ◽  
pp. 172-181
Author(s):  
Sana Ali
Keyword(s):  
Analytical Methods ◽  
High Performance ◽  
Point Of View ◽  
Free Sample ◽  
Highly Sensitive ◽  
Carcinogenic Effects ◽  
Layer Chromatography ◽  
Nanogram Level ◽  
Animal Consumption

The detection and determination of aflatoxins at nanogram level is important from human health point of view. Aflatoxins exhibit acute toxicity demonstrating teratogenic, mutagenic and carcinogenic effects. Amongst the available aflatoxins, B1, B2, G1, G2, M1 and M2 have been the more frequently analysed aflatoxins by chromatographic, spectroscopic and immuochemical methods. Because of the presence of aflatoxins at trace level in food and feedstuff used for human and animal consumption, new analytical methods have been designed for sensitive and selective detection and quantification of aflatoxins. Each of the employed analytical methods, described herein, such as thin layer chromatography, high performance liquid chromatography, gas chromatography and immunochemical methods, among others, has inherent merits and demerits in aflatoxins analysis. This chapter critically examines each of the analytical methods currently in use in the analysis of aflatoxins. Deviating from the earlier approaches, this chapter focuses on the need of methodologies that have negligible environmental impact. Though most of the existing methods are highly sensitive and reasonably safer to use but still there is the need of development of new green methodologies focusing on the reduction of solvent consumption, replacement of environmentally hazardous solvents with more benign alternatives, miniaturization of instrumentation and solvent-free sample preparation.

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