scholarly journals Photoinduced triplet-state electron transfer of platinum porphyrin: a one-step direct method for sensing iodide with an unprecedented detection limit

2015 ◽  
Vol 3 (13) ◽  
pp. 6733-6738 ◽  
Author(s):  
Dilshad Masih ◽  
Shawkat M. Aly ◽  
Erkki Alarousu ◽  
Omar F. Mohammed
Keyword(s):  
Electron Transfer ◽  
Detection Limit ◽  
Triplet State ◽  
Direct Method ◽  
Economical Method ◽  
State Electron ◽  
One Step ◽  
Platinum Porphyrin ◽  
First Time

Herein, we report for the first time the photoinduced triplet-state electron transfer of Pt(ii)TMPyP as an easy, rapid, environmentally friendly, ultra-sensitive and economical method for the determination of iodide in the aqueous phase.

Determination of probabilistic characteristics of random values of estimates of the Lyapunov function when describing a physical process

Metrologiya ◽  
2021 ◽  
pp. 53-67
Author(s):  
Yu. M. Veshkurtsev ◽  
D. A. Titov
Keyword(s):  
Lyapunov Function ◽  
Characteristic Function ◽  
Direct Method ◽  
Special Device ◽  
Transmission Errors ◽  
Matlab Package ◽  
Normal Law ◽  
First Time ◽  
A Direct Method

The applied application of the Lyapunov characteristic function is determined by the properties of its estimates. Probabilistic characteristics of estimates of the Lyapunov characteristic function are described for the first time. The probabilistic characteristics of random values of estimates of the Lyapunov function are empirically estimated using statistical methods. The Matlab package has developed a model of a special device for obtaining estimates of the characteristic function by a direct method. A quasi-deterministic signal is fed to the input of the model, the instantaneous values of which are distributed according to the arcsine law, and an array of values of estimates of the Lyapunov function is obtained at the output, which is used to estimate the probabilistic characteristics of these estimates. Statistical estimation was performed by an indirect method. It is established that the values of the estimates of the Lyapunov characteristic function are distributed according to the normal law. The results of the research will be useful in engineering calculations, for example, when detecting message transmission errors in modems with a modulated characteristic function.

Determination of the photoelectron emission probability with inclined X-ray Laue diffraction

1986 ◽  
Vol 42 (1) ◽  
pp. 24-29 ◽  
Author(s):  
A. M. Afanas'ev ◽  
R. M. Imamov ◽  
E. Kh. Mukhamedzhanov ◽  
A. N. Chuzo
Keyword(s):  
Angular Dependence ◽  
Direct Method ◽  
Simple Relation ◽  
Photoelectron Emission ◽  
Laue Diffraction ◽  
X Ray ◽  
Different Depths ◽  
First Time ◽  
A Direct Method

A simple relation has been established between the Fourier component of the probability density P(z) of photoelectron emission from different depths of a crystal and the angular dependence of the emission of photoelectrons formed in inclined X-ray Laue diffraction, which for the first time permitted the use of a direct method for the reconstruction of the P(z) function. Accurate measurements of the angular dependence of photoelectron emission were carried out on a silicon single crystal with diffraction of Cu Kα radiation for different energy ranges. Photoelectrons were recorded by a proportional gas counter specially designed for the energy analysis of photoelectrons under inclined Laue diffraction conditions. The laws predicted by the theory have been fully confirmed, and the corresponding P(z) functions have been obtained.

Investigation of the Multielement Capability of Laser-Enhanced Ionization Spectrometry in Flames for Analysis of Trace Elements in Water Solutions

1987 ◽  
Vol 41 (1) ◽  
pp. 19-26 ◽  
Author(s):  
O. Axner ◽  
I. Magnusson ◽  
J. Petersson ◽  
S. Sjöström
Keyword(s):  
Trace Elements ◽  
Detection Limit ◽  
Trace Element Analysis ◽  
Frequency Doubling ◽  
Ultraviolet Region ◽  
Element Analysis ◽  
Coumarin 153 ◽  
One Step ◽  
Trace Elements In Water ◽  
First Time

One-step Laser-Enhanced Ionization (LEI) spectrometry of 23 different elements in aqueous solutions has been performed in an acetylene/air flame. All elements were detected by light in the ultraviolet region, produced by frequency doubling of the output from the dye Coumarin 153. This was done in order to investigate the multielement capability of LEI in flames that has been made possible by the recent development of commercially available, widely tunable dyes. Among the elements detected, 9 (As, Au, In, Mn, Pb, Sb, Tl, W, Yb) show detection limits which are superior to those reported in the literature for one-step LEI. The lowest detection limit obtained in this investigation was 1 pg/mL for In. Four of the elements (As, Sb, Yb, W) are reported as being detected by LEI for the first time. The multielement capabilities of LEI as a method for trace element analysis are discussed.

Determination of dehydroepiandrosterone sulfate in plasma by a one-step enzyme immunoassay with a microtitre plate.

1985 ◽  
Vol 31 (11) ◽  
pp. 1876-1879 ◽  
Author(s):  
T K Dhar ◽  
C Müller ◽  
M Schöneshöfer
Keyword(s):  
Hydrogen Peroxide ◽  
Detection Limit ◽  
Enzyme Immunoassay ◽  
Cost Effective ◽  
Dehydroepiandrosterone Sulfate ◽  
Turnaround Time ◽  
Microtitre Plate ◽  
Standard Curve ◽  
One Step

Abstract We have developed a rapid and cost-effective enzyme immunoassay for dehydroepiandrosterone sulfate (DHEA-S) in plasma, performed with samples on a microtitre plate within 2.5 h. No extraction or centrifugation steps are involved. The 3-hemisuccinate of dehydroepiandrosterone is labeled with horseradish peroxidase, then mixed with hydrogen peroxide substrate in the presence of the chromogen, tetramethylbenzidine. The detection limit of the assay is 12.5 pg of DHEA-S per well. Intra- and interassay CVs at three steroid concentrations (12.8, 1.28, and 0.16 mumol/L) ranged from 2.3 to 5.4% and 6.1 to 8.4%, respectively. Results correlated well (r = 0.95) with those of a radioimmunoassay with iodinated DHEA-S. The turnaround time for 41 samples (in duplicate) is 2.5 h, which includes 2 h of incubation time. The sensitivity of this one-step version and the linearity of its standard curve are equivalent to those of a less practicable two-step version. This technique may replace coated-tube enzyme immunoassays for routine use.

Triplet state electron transfer pathway for tetrabenzoporphyrin-diphenyliodonium salt photoinitiator system

1992 ◽  
Vol 64 (1) ◽  
pp. 115-122 ◽  
Author(s):  
Madoka Yasuike ◽  
Motoyuki Shima ◽  
Ken'ichi Koseki ◽  
Tsuguo Yamaoka ◽  
Masako Sakuragi ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Triplet State ◽  
Electron Transfer Pathway ◽  
Diphenyliodonium Salt ◽  
State Electron
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