Method of evaluation of process of red blood cell sedimentation based on photometry of droplet samples
The paper focuses on research aimed at creating and testing a new approach to evaluate the processes of aggregation and sedimentation of red blood cells for purpose of its use in clinical laboratory diagnostics. The proposed method is based on photometric analysis of blood sample formed as a sessile drop. The results of clinical approbation of this method are given in the paper. Analysis of the processes occurring in the sample in the form of sessile drop during the process of blood cells sedimentation is described. The results of experimental studies to evaluate the effect of the droplet sample focusing properties on light radiation transmittance are presented. It is shown that this method significantly reduces the sample volume and provides sufficiently high sensitivity to the studied processes.
An Automated Method for Blood Type Determination by Red Blood Cell Agglutination Assay
A new automated method for assaying specific agglutination of red blood cells upon addition of monoclonal antibodies to whole blood test samples is presented. The method can be used for blood type determination. The method is based on lying drop photometry of blood samples with added Tsoliclone monoclonal antibodies. Mechanical vibration of drop samples promotes better cell agglutination and redistribution through the volume of the sample. Experimental studies revealed significant differences in photometric values for samples with and without agglutination. This method may provide the basis for developing a portable automatic blood-typing device.
Compressive and flexural properties of hemp fiber reinforced concrete
The compressive and flexural properties of hemp fiber reinforced concretes (FRC) were examined in this paper. Natural hemp fiber was mixed using dry and wet mixing methods to fabricate the FRC. Mechanical properties of the FRC were investigated. The main factors affecting compressive and flexural properties of the FRC materials were evaluated with an orthogonal test design. Fiber content by weight has the largest effect. The method for casting hemp FRC has been optimised. Under the optimum conditions, compressive strength increased by 4 %, flexural strength increased by 9 %, flexural toughness increased by 144 %, and flexural toughness index increased by 214 %.