Oblique propagation of arbitrary amplitude electron acoustic solitary waves in magnetized kappa-distributed plasmas

The linear and nonlinear properties of large amplitude electron-acoustic waves are investigated in a magnetized plasma comprising two distinct electron populations (hot and cold) and immobile ions. The hot electrons are assumed to be in a non-Maxwellian state, characterized by an excess of superthermal particles, here modelled by a kappa-type long-tailed distribution function. Waves are assumed to propagate obliquely to the ambient magnetic field. Two types of electrostatic modes are shown to exist in the linear regime, and their properties are briefly analyzed. A nonlinear pseudopotential type analysis reveals the existence of large amplitude electrostatic solitary waves and allows for an investigation of their propagation characteristics and existence domain, in terms of the soliton speed (Mach number). The effects of the key plasma configuration parameters, namely, the superthermality index and the cold electron density, on the soliton characteristics and existence domain, are studied. The role of obliqueness and magnetic field are discussed.Comment: Submitted to Plasma Physics and Controlled Fusio

Quality evaluation of commercially available instant mango drinks powder in local market of Bangladesh

The upward trend of consumption of processed food must not dim the demand of taking healthy and safe food among population. Thus, six popular commercial brands of instant mango drinks powder of Bangladesh were targeted to investigate some quality parameters (proximate compositions, mineral contents and bioactive compounds). Mineral contents and bioactive compounds of instant mango drinks powder were determined by using biochemical analyzer and UV-visible spectrophotometer, respectively. Results of proximate analysis showed that moisture content, ash content, fiber content, and carbohydrate content of different brands of instant mango drinks powder ranged from 0.21 to 0.25%, 0.45 to 0.55%, 0.10 to 0.40%, and 98.83 to 99.21%, respectively, whereas energy value ranged from 395.32 to 396.84 Kcal/100g. Sodium, potassium, calcium, chloride, phosphorus, iron and vitamin-C were also determined, which showed the significant different (p<0.05) values among different brands. Total anthocyanin content (TAC), Total flavonoid content (TFC), Total phenolic content (TPC), Antioxidant capacity were determined as bioactive compounds. Results of bioactive compounds analysis also showed that the samples were significantly different (p<0.05). Although, the quality varied from brand to brand, but all the samples could be good source of vitamin-C, carbohydrate and energy. Furthermore, health concerning issues can be improved by focusing the bioactive compounds of commercially available instant drinks powder. Int. J. Agril. Res. Innov. Tech. 10(2): 54-58, December 202

Dust-ion-acoustic shock waves in a five component dusty plasma with positive and negative ions

The properties of dust-ion-acoustic (DIA) shock waves in a multi-ion dusty plasma containing Maxwellian distributed electrons, inertial positive and negative ions, immobile positively and negatively charged dust particles have been investigated. The standard reductive perturbation method is employed to derive the Burgers equation, which admits shock waves solution. It is observed that the DIA shock structures associated with positive and negative potential shock are formed depending on the plasma parameters (e.g. number densities ratio of electron-to-positive ion, negative ion-topositive ion, negative dust-to-positive ion, etc.) in such a five component multi-ion dusty plasma. The critical value, above (below) which positive (negative) polarity shock waves are formed, is analysed numerically. The relevance of our results to defferent interstellar space plasma situations are discussed

Phenotypic and genotypic screening of rice genotypes at seedling stage for salt tolerance

Selection for salinity tolerance genotypes of rice based on phenotypic performance alone is less reliable and will delay progress in breeding. Recent advent of molecular markers, microsatellites or simple sequence repeats (SSRs) are used to find out salt tolerant rice genotypes. Three selected SSR markers; RM7075, RM336 and RM253 were used to evaluate rice genotypes for salt tolerance. Phenotypic and genotypic evaluation for salinity tolerance was done at the seedling stage. Phenotypingof 11 genotypes was done in hydroponic system using salinized (EC 12 dS/m) nutrient solution. IRRI standard protocol was followed to evaluate salinity tolerance. Large variation in salinity tolerance among the rice germplasms was detected. Plant height and total dry matter of tolerant lines were reduced by 19.0 and 40.6%, respectively under salt stress (EC 12 dS/m), whereas those of susceptible lines were reduced by 46.0 and 73.5%, respectively. The markers showed polymorphism and were ableto discriminate salt tolerant genotypes from susceptible. The genotypes having similar banding pattern with Pokkali were considered as salt tolerant. The SSR markers (RM7075, RM336 and RM253) identified8, 9 and 7 salt tolerant genotypes, respectively. Through phenotypic and genotypic study, three genotypes viz., Pokkali, TNDB-100 and THDB were identified as salt tolerant rice cultivar. These SSR markers might have sequence homology with salt tolerant rice genotypes and consequently themarkers could able to identify salt tolerant rice genotypes from susceptibles

Unexplored photoluminescence from bulk and mechanically exfoliated few layers of Bi2Te3

We report the exotic photoluminescence (PL) behaviour of 3D topological insulator Bi2Te3 single crystals grown by customized self-flux method and mechanically exfoliated few layers (18 plus minus 2 nm)/thin flakes obtained by standard scotch tape method from as grown Bi2Te3 crystals.The experimental PL studies on bulk single crystal and mechanically exfoliated few layers of Bi2Te3 evidenced a broad red emission in the visible region. These findings are in good agreement with our theoretical results obtained using the ab initio density functional theory framework.Comment: Main MS (17 Pages text including 4 Figs): Suppl. info. (4 pages); Accepted Scientific Report

Structure modeling and mutational analysis of gap junction beta 2 (GJB2)

The genome sequencing accomplishes complete genetic blue prints for hundreds of organisms, including humans. In the current era, we are trying to focus on analyzing, controlling and modifying functions of proteins encoded by these genomes. This task is attained by protein three dimensional structures. Three dimensional (3 D) structure is very useful for understanding biological functions. Gap junction beta 2 (GJB2), human gene encoding for gap junction beta 2 protein is involved in various hearing disorders in Pakistani families. After the first report of GJB2 involvement in Pakistani families, it was necessary to further study this protein. Therefore, a 3D structure of GJB2 was developed using comparative modeling approach. For modeling, a template was selected by blastp at NCBI and the best template selected was 2ZW3. By comparing the template-target sequence, a model was created using MODELLER, a program for homology modeling. The accuracy of the predicted structure was checked using Ramachandran plot which showed that the residue falling in the favored region was 92.4%. The predicted GJB2 model can be used to understand the defects that lead to deafness and eventually in drug designing. Domains and different properties of GJB2 were analyzed by applying online servers. Most frequent mutations of GJB2 were discussed by differentiating between damaging and benignity.Key words: GJB2, 3D structure, 2ZW3, DFNB1, MODELLER