FROM A STUDY OF THE ACCOMPANYING TRACINGS WE MAY CONCLUDE THAT: 1. The delicate mechanism of the micrograph registers the movements in the heart and blood-vessels more accurately than does the polygraph. 2. The inertia of the polygraph lever and diaphragm distorts the tracing. The difference between the results obtained with the two instruments is shown by the records made simultaneously with t...

We present a fast, novel method for building porous silicon-based silicon-on-insulator photonic crystals in which a periodic modulation of the refractive index is built by alternating different electrochemical etching currents. The morphology and reflectance spectra of the photonic crystals, prepared by the proposed method, are investigated. The scanning electron micrograph and atomic force mic...

This work describes the development of a dedicated system capable of identifying, measuring and counting various types of fibers and other objects in digitized scanning electron micrograph (SEM) imagery. The system uses a recursive high order correlation (HOC) process to extract the corner pixels of the fibers. The objects are defined by grouping connected corners, so that morphometric analysis...

In the previous papers, some attempts for purification and concentration of the GDVII strain of mouse encephalomyelitis virus by means of ether extraction, metanol-acetone precipitation, hemagglutination , and agglutination to red cell stroma were reported. Purification of the GDVI virus by hemagglutination was described by Lahelle and Ward. The presenting paper is to describe a method for puri...

FIOURE 1 This electron micrograph shows a nerve process (gr) containing predominantly granular vesicles which makes intimate contact with the surface of a cardiac muscle cell (arrows). A portion of a nerve process (affr) containing only agranular vesicles is situated above the other nerve process. Serial sections would most likely show these two nerve processes lying side-by-side, g, glycogen p...

Nano-Au and methylene blue (MB) were assembled layer-by-layer (LBL) into films on the glassy carbon electrode modified by thiourea for detection of human chorionic gonadotrophin (HCG). The electrode modification process was characterized by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and scanning electron micrograph (SEM). The factors influencing the performance of the...

The follicle epithelial cells of the thyroid gland from three horses were subjected to x-ray microanalysis to identify directly the distribution of iodine and other elements. The scanning transmission electron micrograph of the thyroid was directly correlated with the distribution of these elements detected by energy dispersive x-ray microanalyzer. Higher level of I, S, P, and Cl was detected i...

Rotational power spectrum analysis of scanning transmission electron micrographs of negatively stained herpesvirus capsids has given direct evidence for the 6-fold symmetry of the herpesvirus hexon capsomere. Individual hexons have been analyzed in situ without interference from other parts of the capsid because only one level of the capsid was in focus in the micrograph. This study found hexon...

Two Leuconostoc mesenteroides strains NCDC 744 and NCDC 745 were evaluated for exopolysaccharides (EPS) production in whey and MRS medium. Paneer whey medium supplemented with 10% sucrose, 0.1 % yeast extract and 0.1 % K2HPO4 was found to be proferred medium for EPS production. Among two strains L. mesenteroides NCDC 744 produced significantly higher EPS (12.7 ± 0.24 gm/L) as compared to NCDC 7...

We describe the fabrication of optimized plasmonic substrates in the form of immobilized nanorod assemblies (INRA) for surface-enhanced Raman spectroscopy (SERS). Included are high-resolution scanning electron micrograph (SEM) images of the surface structures, along with a mechanistic description of their growth. It is shown that, by varying the size of support microspheres, the surface plasmon...