Differentiation of lysozyme activity in the fast, slow and cardiac muscles of chick

Lysosomal activity did not vary in embryonic muscles, whereas adult posterior latissimus dorsi muscles (PLD) of the wing of White Leghorn chicks showed greater activity than adult anterior latissimus dorsi muscles (ALD)​. Cardiac muscle showed very low lysosomal activity, that of embryo as well as of adult exhibiting the same specific activity. These results suggested that lysosomal activity was initially the same in all 3 embryonic muscles but, as the skeletal muscles differentiated into the adult types, they synthesized more active lysozyme than the heart. Among the skeletal muscles, the PLD synthesized more active enzyme than the ALD. Since greater lysozyme activity implied a well-​organized lysosomal activity existing in the muscle, from the standpoint of pathophysiol. significance, it was suggested that the adult skeletal muscles had to synthesize more lysozyme for protection, whereas the embryonic muscles were well-​protected by the lysozyme of the egg albumin

Beam Switching Cylindrical Array Antenna System for Communication

The beam switching cylindrical array, which is a unique system, has been designed and developed to cover 360° in azimuth plane by generating 16 beams with specified elevation coverage.In this design, the concept of fast aperture selection (4 x 4) in microseconds from the total cylindrical array has been realised successfully to meet the requirement of point-to-multipoint communication. The components of the array, viz., radiating elements, powder dividers, switches, etc., are designed in printed circuit type, and hence, objectives of lightweight and ease of reproducibility are achieved. The lightweight of the array makes it accessible for easy mounting at a specified height for achieving longer communication range. Finally, a low-loss radome is incorporated to protect the array from environmental conditions. The various parameters, viz., return loss, gain, and switched-beam radiation patterns were measured over a bandwidth of 300 MHz in L- band and typical measured results are presented in this paper

Self-healing epoxy/PDMS/graphene oxide nanocomposites for anti-corrosive applications

This study discusses the synthesis, characterization and development of self-healing nanocomposite of amino-terminated PDMS (Polydimethylsiloxane), Epoxy (EPON828 ̧ Diethylenetriamine (DETA)), and Graphene Oxide (GO). GO was prepared using a modified Hummer’s method and was incorporated into the PDMS-Epoxy composite in various ratios (0.1 wt.%, 0.3 wt.%, and 0.5 wt.%) using toluene as the dispersing medium. Fourier Transform Infrared Spectroscopy was used for confirming the presence of the designed/prepared structures, and thermo-mechanical analysis was performed to test the change in glass transition temperature and initiation temperature of self-healing process. The composite resins were coated on mild steel substrates by curing freshly prepared resins over the substrates at elevated temperatures. The corrosion behavior of mild steel in 3.5 wt.% NaCl solution before and after the coatings was studied using Tafel Electrochemical Polarization test. The self-healing properties of the materials were also studied by applying cuts on the material and letting them heal under elevated temperatures, and the results showed that the prepared coating demonstrated an effective corrosion resistance for mild steel for various marine application