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.
A device for studying the scattering properties of fluid droplet samples
Scattering indicatrices can yield substantial information on the composition and properties of samples in studies of dispersive media by optical methods. This paper describes a simple and convenient experimental setup that allows measurements of the scattering indicatrices (at angles from −90° to +90°) of fluid samples in the form of sessile droplets with concurrent recording and estimation of the geometrical parameters of the lateral projection of a droplet sample. The results of studying samples of blood with different levels of hematocrit and different types of erythrocyte aggregation are presented. The device can be used both in scientific research for studying physical properties of liquids and in clinical diagnostic practice for staging a number of existing hematological, immunological, and biochemical tests.
Water vapor continuum in the 15- to 25-micron spectral region: evidence for (H20)2 in the atmosphere
Recent investigations of the atmospheric transmittance in the 15- to 25-μm spectral region have produced experimental results of the absorption of the water vapor continuum. From these results it is evident that the excessive absorption of the water vapor (the water continuum) cannot be explained simply by the theoretical continuum model based on the modified impact theory and the Van Vleck-Huber model of line broadening. The measured continuum absorption has spectral features similar to those roughly predicted by the water dimer theory. A quantitative agreement between the experimental results and the prediction according to the dimer theory was found.