Shiv Nadar University

About: Shiv Nadar University is a education organization based out in Dadri, Uttar Pradesh, India. It is known for research contribution in the topics: Population & Graphene. The organization has 1015 authors who have published 1924 publications receiving 18420 citations.

Estimation of genetic parameters of fruit quality traits in mango hybrid population

Abstract: The study was designed to evaluate the genetic variability for fruit quality in mango progenies. The fruit quality traits of F1 progenies were evaluated on the basis of morphological and biochemical parameters. The results showed the existence of genetic variability among progenies with differences in the progeny performance for the traits. Value of phenotypic coefficients of variation was higher than genotypic coefficients of variation but minimum difference was noticed between them. Comparatively high degree of genotypic coefficients of variation (GCV) along with phenotypic coefficients of variation was observed in quality traits like, fruit weight, fruit volume, pulp: stone ratio and total carotenoids. High to moderate broad-sense heritability was estimated for different fruit quality traits. High magnitude of broad-sense heritability was recorded in traits like, fruit weight (0.82), fruit volume (0.80), total carotenoids (0.97), ascorbic acids (0.83), stone width (0.71) and fruit length (0.70). Moderate degree of heritability was noted in traits, viz., titratable acidity (0.58), fruit width (0.62), stone length (0.68), stone thickness (0.62), peel thickness (0.53) and total soluble solids (0.69). High heritability along with high genetic advance was estimated for fruit weight and fruit volume. Genetic parameters estimated for fruit quality traits of mango may be useful to formulate pre-selection criteria and efficient breeding strategies of mango for development of new hybrids.

Darboux chart on projective limit of weak symplectic Banach manifold

Abstract: Suppose M be the projective limit of weak symplectic Banach manifolds {(Mi, ϕij)}i, j∈ℕ, where Mi are modeled over reflexive Banach space and σ is compatible with the projective system (defined in the article). We associate to each point x ∈ M, a Frechet space Hx. We prove that if Hx are locally identical, then with certain smoothness and boundedness condition, there exists a Darboux chart for the weak symplectic structure.

A Study of Eu Doping in Nanolayers of CsPbBr3 using Ab Initio Calculations to Understand f–f Transitions in Eu3+-Doped Nanocrystals for Light-Emitting Diodes

Abstract: Recent experiments on Eu-doped nanocrystals of CsPbX3 (X = Cl, Br) show that Eu exists in the 3+ oxidation state even though it substitutes Pb, which is in the 2+ state in these perovskites. Theref...

Ta-doped SrTiO3 epitaxial thin film: A promising perovskite for optoelectronics

Abstract: SrTiO3 is a wide bandgap cubic perovskite oxide and displays many exotic properties, i.e., transparent conductivity, photocatalysis, metallicity, ferroelectricity, superconductivity, colossal magnetoresistance, two-dimensional electron gas, etc., due to the manipulations of defect chemistry and constituent elements via impurity doping. This paper reports on the intricacy of the structural and optoelectronic properties of the epitaxially stabilized 5 at. % Ta-doped SrTiO3 (001) thin films on LaAlO3 (001) substrates by systematically varying the growth temperature and oxygen partial pressure during the pulsed laser deposition process. The influences of Ta dopant and growth parameters on the epitaxial quality of these layers are understood by determining the dopant location and its concentration in the SrTiO3 lattice. The complex relationships of optical and electronic properties on growth parameters, dopant concentration, and single crystal quality of the films are demonstrated. The observed low resistivity (∼5 × 10−3 Ω cm) and high optical transparency (∼85%–90%) of optimized Ta-doped SrTiO3 films offer it as an exciting material for next generation transparent optoelectronics.

Reduction of Sphingosine Kinase 1 Phosphorylation and Activity in Plasmodium-Infected Erythrocytes

Abstract: Sphingosine-1-phosphate (S1P), a bioactive lipid mediator is involved in an array of biological processes and linked to pathological manifestations. Erythrocyte is known as the major reservoir for S1P as they lack S1P degrading enzymes (S1P lyase and S1P phosphohydrolase) and harbor sphingosine kinase-1 (SphK-1) essential for sphingosine conversion to S1P. Reduced S1P concentration in serum was correlated with disease severity in patients with Plasmodium falciparum and Plasmodium vivax infections. Herein, we aimed to identify the underlying mechanism and contribution of host erythrocytes towards depleted S1P levels in Plasmodium infected patients vs. healthy individuals. The level and activity of SphK-1 were measured in vitro in both uninfected and cultured P. falciparum infected erythrocytes. Infected erythrocytes demonstrated a significant decrease in SphK-1 level in a time-dependent manner. We found that, 10 to 42 hours post invasion (hpi), number of rings, trophozoites and schizonts were predominantly reduced to ~50% as compared to uninfected erythrocytes. We next analyzed the phosphorylation status of SphK-1, a modification responsible for its activity and S1P production, in both uninfected control and Plasmodium infected erythrocytes. Almost ~50% decrease in phosphorylation of SphK-1 was observed that could be corroborated with significant reduction in the production and release of S1P in infected erythrocytes. Serum S1P levels were, studied in parallel in P. falciparum (N = 15), P. vivax (N = 36) infected patients and healthy controls (N = 6). The findings revealed that S1P concentration was significantly depleted in uncomplicated malaria cases and was found to be lowest in complicated malaria and thrombocytopenia in both P. falciparum and P. vivax infected groups (p < 0.01**). The lower serum S1P level could be correlated with the reduced platelet count defining the role of S1P level in platelet formation. In conclusion, erythrocyte SphK-1 and S1P levels were studied in Plasmodium infected individuals and erythrocytes that helped in characterizing the complications associated with malaria and thrombocytopenia, providing insights into the contribution of host-erythrocyte biology in malaria pathogenesis. Finally, this study proposes the use of S1P and its analogue as a novel adjunct therapy for malaria complications.