scholarly journals Sulfur analysis of the sediment by the H2O2 treatment-turbidimetric method: A simple method for studying the paleoenvironment.

1989 ◽  
Vol 28 (1) ◽  
pp. 35-40 ◽  
Author(s):  
Hiroshi SATO
Keyword(s):  
H2o2 Treatment ◽  
Simple Method ◽  
Turbidimetric Method

scholarly journals Influence of Supersaturation, Temperature and Rotational Speed on Induction Time of Calcium Sulfate Crystallization

Crystals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1236
Author(s):  
Agata Małysiak ◽  
Szymon Orda ◽  
Michał Drzazga
Keyword(s):  
Data Analysis ◽  
Rotational Speed ◽  
Induction Time ◽  
Calcium Sulfate ◽  
Building Materials ◽  
Simple Method ◽  
Turbidimetric Method ◽  
Impression Materials ◽  
Time Calculation ◽  
Tablet Excipients

Calcium sulfate is a very important product of precipitation reactions in various branches of industry. The most common applications include building materials, impression materials in dentistry, immobilizing casts and an inactive ingredient of tablet excipients. It is also used as a drying agent and color glaze. In this paper, influence of various conditions, i.e., substrates concentration (supersaturation), temperature and rotational speed on induction time was investigated. The range of investigated parameters was 0.15–0.35 M for concentration with step of 0.05 M, 298–323 K with step of 5 K for temperature, and 1.67–8.33 s−1 for rotational speed with change every 1.67 s−1. The experiments were performed using visual and turbidimetric methods. It was proven that increase in all three investigated parameters resulted in shorter induction time. The turbidimetric method was found to be more precise, but still insufficient for concentrations below 0.15 M. Moreover, as a result of data analysis, a simple method of induction time calculation was proposed when arbitrary measurements in various concentrations are known.

scholarly journals A simple method for measuring fibrinogen and evaluating its functionality

2020 ◽  
pp. 74-81
Author(s):  
Б.Б. Шойбонов ◽  
О.М. Драпкина ◽  
Т.П. Баронец ◽  
Н.Ю. Серебрякова ◽  
М.Б. Худяков ◽  
...  
Keyword(s):  
Conversion Coefficient ◽  
Fibrinogen Level ◽  
Degradation Products ◽  
Experimental Sample ◽  
Simple Method ◽  
Turbidimetric Method ◽  
Fibrin Degradation Products ◽  
High Degree ◽  
Test Result ◽  
Citrate Plasma

Актуальность. Определение фибриногена (ФГ) по Клауссу является чувствительным к гипо-, дис- и гипер-фибриногенемии, а также к продуктам деградации фибрина, которые влияют на процесс коагуляции и могут быть причиной занижения или повышения уровня фибриногена. Цель настоящей работы - разработка простого турбидиметрического теста для определения фибриногена и оценка его функциональности. Материалы и методы. В работе определяли фибриноген в цитратных плазмах 96 пациентов по методу Клаусса, модифицированным методом Рутберга и новым турбидиметрическим тестом. Результат. Разработан простой турбидиметрический тест определения фибриногена, основанный на определении коагулированного фибриногена при рекальцификации цитратной плазмы по формуле: ФГ (г / л) = ΔА450 × 5,12, где ΔА450 - изменение оптической плотности в опытной пробе; 5,12 - переводной коэффициент ΔА450 в г/л ФГ. Корреляционный анализ показал высокую степень сходимости результатов (R = 0,843). При разнице ФГ более 10% по Клауссу и по разработанному методу констатируют как нарушенную функциональность ФГ. Заключение. Использование простого, доступного турбидиметрического метода определения фибриногена в рутинных исследованиях позволяет оценивать функциональность фибриногена. Background. The Clauss fibrinogen assay is sensitive to hypo-, dys- and hyper-fibrinogenemia, as well as to fibrin degradation products, which may affect coagulation and cause underestimation of or increase the fibrinogen level. The aim of this study was to develop a simple turbidimetric test to measure fibrinogen and evaluate its functionality. Materials and methods. In this study, fibrinogen was measured in citrate plasma from 96 patients using the Clauss assay, a modified Rutberg method, and a new turbidimetric test. Result. A simple turbidimetric test was developed for measuring fibrinogen. This test is based on measuring coagulated fibrinogen during recalcification of citrate plasma according to the formula, FG (g/l) = ΔА450 × 5.12, where ΔА450 is a change in optical density of the experimental sample; 5.12 is a conversion coefficient ΔА450 in g/l FG. Correlation analysis showed a high degree of agreement between the results (R = 0.843). With a FG difference of more than 10% by the Clauss assay and the developed method, impaired functionality of the FG is stated. Conclusion. Using a simple, affordable turbidimetric method to determine fibrinogen in routine studies allows accessing the fibrinogen functionality.

A simple way for producing holographic filters suitable for image improvement

1978 ◽  
Vol 36 (1) ◽  
pp. 226-227
Author(s):  
K.-H. Herrmann ◽  
E. Reuber ◽  
P. Schiske
Keyword(s):  
Transfer Functions ◽  
Diffraction Order ◽  
Lateral Position ◽  
Simple Method ◽  
Spatial Frequencies ◽  
Resolution Electron ◽  
Wiener Filters ◽  
Image Improvement ◽  
Optical Reconstruction ◽  
Set Up

Aposteriori deblurring of high resolution electron micrographs of weak phase objects can be performed by holographic filters [1,2] which are arranged in the Fourier domain of a light-optical reconstruction set-up. According to the diffraction efficiency and the lateral position of the grating structure, the filters permit adjustment of the amplitudes and phases of the spatial frequencies in the image which is obtained in the first diffraction order.In the case of bright field imaging with axial illumination, the Contrast Transfer Functions (CTF) are oscillating, but real. For different imageforming conditions and several signal-to-noise ratios an extensive set of Wiener-filters should be available. A simple method of producing such filters by only photographic and mechanical means will be described here.A transparent master grating with 6.25 lines/mm and 160 mm diameter was produced by a high precision computer plotter. It is photographed through a rotating mask, plotted by a standard plotter.

Rotary Beveling for In Situ Thin-Section Microscopy of Cell Cultures

1981 ◽  
Vol 39 ◽  
pp. 550-551
Author(s):  
Dean A. Handley ◽  
Jack T. Alexander ◽  
Shu Chien
Keyword(s):  
Cell Growth ◽  
Cell Cultures ◽  
Molecular Interactions ◽  
Convenient Method ◽  
Petri Dish ◽  
Simple Method ◽  
Thin Section Microscopy ◽  
Thin Sectioning ◽  
Organic Fluids

In situ preparation of cell cultures for ultrastructural investigations is a convenient method by which fixation, dehydration and embedment are carried out in the culture petri dish. The in situ method offers the advantage of preserving the native orientation of cell-cell interactions, junctional regions and overlapping configurations. In order to section after embedment, the petri dish is usually separated from the polymerized resin by either differential cryo-contraction or solvation in organic fluids. The remaining resin block must be re-embedded before sectioning. Although removal of the petri dish may not disrupt the native cellular geometry, it does sacrifice what is now recognized as an important characteristic of cell growth: cell-substratum molecular interactions. To preserve the topographic cell-substratum relationship, we developed a simple method of tapered rotary beveling to reduce the petri dish thickness to a dimension suitable for direct thin sectioning.

Development of a simple method for the determination of single nucleotide polymorphisms

2010 ◽  
Vol 34 (8) ◽  
pp. S75-S75
Author(s):  
Weifeng Zhu ◽  
Zhuoqi Liu ◽  
Daya Luo ◽  
Xinyao Wu ◽  
Fusheng Wan
Keyword(s):  
Single Nucleotide Polymorphisms ◽  
Nucleotide Polymorphisms ◽  
Simple Method ◽  
Single Nucleotide
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