The determination of potassium on the micro-scale by the phosphomolybdate method

1954 ◽  
Vol 42 (1) ◽  
pp. 49-52 ◽  
Author(s):  
R. Belcher ◽  
J. W. Robinson
Keyword(s):  
Micro Scale

Optical Methodology for Testing of Microsystems

2009 ◽  
Author(s):  
Ryszard J. Pryputniewicz ◽  
Ryan T. Marinis ◽  
Peter Hefti
Keyword(s):  
High Performance ◽  
Emerging Technologies ◽  
Reliability Assessment ◽  
Design Analysis ◽  
Functional Characteristics ◽  
Micro Scale ◽  
Combined Use ◽  
Challenging Tasks ◽  
Micro Structures

Advancing the emerging technologies of MEMS, especially relating to the applications, constitutes one of the most challenging tasks in today’s micromechanics. In addition to design, analysis, and fabrication capabilities, this task also requires advanced test methodologies for determination of functional characteristics of devices produced to enable verification of their operation as well as refinement and optimization of specific designs. The tools used can be categorized as analytical, computational, and experimental. Solutions using the tools from any one category alone do not usually provide all of the necessary information on MEMS and extensive merging, or hybridization, of the tools from different categories is used. One of the approaches employed in the development of micro-structures of contemporary interest, is based on a combined use of the analytical, computational, and experimental solutions (ACES) methodology. In this paper, applicability of the ACES methodology is illustrated by use of selected MEMS samples. The representative results presented in this paper indicate that the optical methodology is a viable tool for micro-scale measurements and, as such, it is particularly useful for development of MEMS, especially while considering MEMS reliability assessment. In fact, this methodology is being used in various manufacturing stages of MEMS for high-performance applications.

Spectrophotofluorometric Assay for Isoniazid and Acetyl Isoniazid in Plasma Adapted to Pediatric Studies

1977 ◽  
Vol 23 (4) ◽  
pp. 745-748 ◽  
Author(s):  
William A Olson ◽  
Peter G Dayton ◽  
Zafar H Israili ◽  
Albert W Pruitt
Keyword(s):  
Clinical Application ◽  
Small Animals ◽  
Micro Scale ◽  
Acid Labile

Abstract We modified the micro-scale spectrophotofluorometric method of Miceli et al. [Biochem. Med. 12, 348 (1975)] for the assay of "apparent" isoniazid (isoniazid plus acid-labile hydrazones) to improve its clinical application. We also adapted the method for determination of acetyl isoniazid. Data are presented showing how long plasma containing isoniazid may validly be stored. The applicability of the method was demonstrated in studies on children and small animals.

New micro-turbidimetric method for determination of protein in cerebrospinal fluid and urine.

1979 ◽  
Vol 25 (7) ◽  
pp. 1317-1319 ◽  
Author(s):  
J Iwata ◽  
O Nishikaze
Keyword(s):  
Cerebrospinal Fluid ◽  
Gamma Globulin ◽  
Sulfosalicylic Acid ◽  
Trichloracetic Acid ◽  
Micro Scale ◽  
Turbidimetric Method ◽  
Classic Method ◽  
Benzethonium Chloride ◽  
Higher Sensitivity

Abstract We report a new micro-scale (0.1-mL sample) turbidimetric method for determination of protein by use of benzethonium chloride in alkali. The method is highly specific for protein, has a higher sensitivity than the classic method of Lowry et al., and shows satisfactory reproducibility and recovery. The turbidity produced in our method is the same for albumin and gamma-globulin and is more stable than in Meulemans' method (in which sulfosalicylic acid is used) or in the method of Bossak et al. (in which trichloracetic acid is used). In contrast to Pesce and Strande's method, there is no manipulative loss of protein.

scholarly journals New Considerations on the Determination of the Apparent Shear Viscosity of Polymer Melt with Micro Capillary Dies

Polymers ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 4451
Author(s):  
Wangqing Wu ◽  
Ke Zeng ◽  
Baishun Zhao ◽  
Fengnan Duan ◽  
Fengze Jiang
Keyword(s):  
Shear Viscosity ◽  
Compaction Pressure ◽  
Experimental Studies ◽  
Polymer Melt ◽  
Rheological Measurement ◽  
Shear Rates ◽  
Micro Scale ◽  
Viscosity Determination ◽  
Main Factor

Capillary rheometers have been widely used for the rheological measurement of polymer melts. However, when micro capillary dies are used, the results are usually neither accurate nor consistent, even under the same measurement conditions. In this work, theoretical modeling and experimental studies were conducted for a more profound understanding of the mechanism by which the initial and boundary conditions influence the inaccuracy in the apparent shear viscosity determination with micro capillary dies (diameters: 500 μm, 200 μm, 100 μm). The results indicate that the amount of polymer initially in the barrel, the pre-compaction pressure and the capillary die diameter have a significant influence on the development of the micro scale inlet pressure, which directly determines the accuracy of the measurement at low and medium shear rates. The varying melt compressibility was confirmed to be the main factor directly related to the inaccuracy in the micro scale apparent shear viscosity determination. It is suggested that measures such as reducing the amount of polymer initially in the barrel and increasing the pre-compaction pressure could be used to reduce the measurement inaccuracy.

Simplified micro-scale procedure for preparing samples for theophylline determination by liquid chromatography.

1977 ◽  
Vol 23 (1) ◽  
pp. 124-126 ◽  
Author(s):  
J W Nelson ◽  
A L Cordry ◽  
C G Aron ◽  
R A Bartell
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
High Performance ◽  
Standard Sample ◽  
Retention Volume ◽  
Internal Standard ◽  
Reverse Phase ◽  
Micro Scale ◽  
Quantitative Results

Abstract We describe an improved procedure for the preparation of plasma or serum for determination of theophylline by reverse phase high-performance liquid chromatography. Quantitative results are available in less than 30 min from receipt of sample. The chromatogram is complete in 8 to 16 min, which includes the use of an internal standard. Sample preparation consists of simple solvent denaturation of the sample proteins, and centrifugation to remove protein before chromatography. No precolumn is required to pretect the separating column. No interference was noted when sodium or lithium heparin or ethylenediaminetetraacetate were used as anticoagulants, but citrate treatment proved to be unsatisfactory because of a highly absorbing band that eluted with the same retention volume as theophylline.

Sign in / Sign up

Export Citation Format

Share Document