First record of threadfin bream, Nemipterus zysron (Bleeker, 1857) from Andhra Pradesh Coast

Threadfin breams, a major demersal resource of Visakhapatnam region is represented by a single genus Nemipterus and is fished extensively by trawlers. Five species of this genus viz., Nemipterus mesoprion, N. japonicus, N. delagoae, N. Iuteus and N. tolu generally contribute to the fishery of the region. A sixth species, Nemipterus zysron was collected and identified from the catch at Visakhapatnam Fishing Harbour on 15th July 2008

Secondary Flow and Heat Transfer of Two Incompressible Immiscible Fluids Between Two Parallel Plates in a Rotating System

When a straight channel formed by two parallel plates, through which two immiscible fluids are flowing under constant pressure gradients is rotated about an axis perpendicular to the plates, secondary motion is set up. The secondary motion is analysed in detail for constant angular velocity ohm', lambda the ratio of their viscosities. The associated heat transfer problems, when the plate temperatures are equal and different, have also been studied

Nonlinear Absorption, Scattering and Optical Limiting Studies of CdS Nanoparticles

The nonlinear optical absorption, scattering and optical limiting properties of CdS nanoparticles dispersed in dimethylformamide (DMF) are investigated. The nanoparticles are synthesized using the standard chemical synthesis method with thioglycerol as the capping agent. The investigations are carried out at 532 nm in the ns regime. Strong two-photon absorption and nonlinear scattering are found to be responsible for good optical limiting characteristics in these nanoparticles

Efficient expression of transgenes in adult zebrafish by electroporation

BACKGROUND: Expression of transgenes in muscle by injection of naked DNA is widely practiced. Application of electrical pulses at the site of injection was demonstrated to improve transgene expression in muscle tissue. Zebrafish is a precious model to investigate developmental biology in vertebrates. In this study we investigated the effect of electroporation on expression of transgenes in 3–6 month old adult zebrafish. RESULTS: Electroporation parameters such as number of pulses, voltage and amount of plasmid DNA were optimized and it was found that 6 pulses of 40 V·cm(-1 )at 15 μg of plasmid DNA per fish increased the luciferase expression 10-fold compared to controls. Similar enhancement in transgene expression was also observed in Indian carp (Labeo rohita). To establish the utility of adult zebrafish as a system for transient transfections, the strength of the promoters was compared in A2 cells and adult zebrafish after electroporation. The relative strengths of the promoters were found to be similar in cell lines and in adult zebrafish. GFP fluorescence in tissues after electroporation was also studied by fluorescence microscopy. CONCLUSION: Electroporation after DNA injection enhances gene expression 10-fold in adult zebrafish. Electroporation parameters for optimum transfection of adult zebrafish with tweezer type electrode were presented. Enhanced reporter gene expression upon electroporation allowed comparison of strengths of the promoters in vivo in zebrafish

Brillouin Scattering Studies of La_{0.77}Ca_{0.23}MnO_3 Across Metal-Insulator Transition

Temperature-dependent Brillouin scattering studies have been carried out on La_{0.77}Ca_{0.23}MnO_3 across the paramagnetic insulator - ferromagnetic metal (I-M) transition. The spectra show a surface Rayleigh wave (SRW) and a high velocity pseudo surface acoustic wave (HVPSAW) besides bulk acoustic waves (BAW). The Brillouin shifts associated with SRW and HVPSAW show blue-shifts, where as the frequencies of the BAW decrease below the I-M transition temperature (T_C) of 230 K. These results can be understood based on the temperature dependence of the elastic constants. We also observe a central peak whose width is maximum at T_C.Comment: 7 pages, 8 figure

Techniques Used in Biometric Authentication - Applicability and Future Scope

In recent past, biometrics has emerged rapidly with its worldwide applications for daily living. Novel trends and new developments have been proposed to obtain and pursue many diverse biometric traits. The ignored challenge in the precedent and potential issues need to be addressed together and intensely integrated. The main objective of the paper is to keep up with the innovative technologies on some current theoretical development as well as fresh trends of biometric applications. The topics covered in this paper reflect well both aspects of development. This paper deals with the techniques used for biometric authentication and their future possibilities. This paper also focus on the applicability, strengths and weaknesses of several biometric recognition systems with a comprehensive review of the developments in this field

Optical power limiting in the femtosecond regime by silver nanoparticle–embedded polymer film

A simple methodology is developed for the fabrication of freestanding polymer films with embedded silver nanoparticles grown in situ. Strong nonlinear absorption, positive nonlinear refraction, and efficient optical limiting in the femtosecond regime are demonstrated with these films. Additional investigations with supported films as well as parallel studies in the nanosecond regime are also presented. The freestanding nature of the films is not only of potential interest from the application perspective but also facilitates the unambiguous determination of the nonlinear coefficients of the metal nanoparticles embedded in polymer matrix without complications arising due to the contributions from the substrate