4,545 research outputs found
Structural and Magnetic Characterizations of Co2FeGa/SiO2 Nanoparticles Prepared via Chemical Route
We report the synthesis of Co2FeGa/SiO2 nanoparticles by sol-gel method and
characterization using x-ray diffraction (XRD), transmission electron
microscopy (TEM) and magnetic measurements. The Rietveld refinements of XRD
data with space group Fm-3m clearly show the formation of A2 disorder single
phase and the lattice constant is found to be 5.738 {\AA}. The
energy-dispersive x-ray spectroscopy (EDX) confirm the elemental composition
close the desired values. The value of coercivity is found to be around 283 Oe
and 126 Oe, measured at 10 K and 300 K, respectively. We observed the
saturation magnetization significantly lower than expected from Slater-Pauling
rule. This decrease in the magnetic moment might be due to the presence of
amorphous SiO2 during the synthesis process. A large content of small size SiO2
particles along with Co2FeGa nanoparticles are also found in TEM study.Comment: 4 pages, AIP conferenc
Field Screening of Lentil Genotypes Against Aphid Infestation in Inner Tarai of Nepal
Twenty lentil (Lens culinaris Medik) genotypes received from Grain Legumes Research Program, Khajura, Banke were screened for relative tolerance against aphid (Aphis craccivora Koch.) at the research field of National Maize Research Program, Rampur, Chitwan during winter seasons of two consecutive years 2016 and 2017. The design of the experiment was Randomized Complete Block having three replications. The unit plot size was 4m × 1 m with 25cm row to row spacing and continue plant to plant spacing was maintained and net harvested plot was 4 square meters. The recommended dose of fertilizer was 20:40:20 N:P2O5:K2O kg/ha and seed rate 30 kg/ha. Insect data were collected based on aphid population found at apical twigs (10 cm) per plant and scoring was done during flowering and pod formation stage. The grain yield was recorded. All screened genotypes differed significantly (p<0.05) on aphid population and grain yield. Genotypes, ILL 9924, RL 83, ILL 10856, ILL 6458 and RL 67 were less susceptible with higher grain yield. These results have important implications for the development of aphid tolerant high yielding lentil variety in inner Tarai of Nepal
Growth and Characterization of Fe0.95Se0.6Te0.4 Single Crystal
In this paper we present the single crystal growth of Fe0.95Se0.6Te0.4 high
TC superconducting sample by the modified Bridgman technique. The x-ray
diffraction pattern shows the single crystal nature of the sample, as only
(00l) peaks are detectable. The stoichiometric composition has been verified by
energy dispersive x-ray analysis. The superconducting transition temperature at
14 K was confirmed through DC magnetization (ZFC-FC) and resistivity
measurements. By analyzing the isothermal M-H curves, we determined the value
of H_c1 (0) ~360 Oe by extrapolating the data. The temperature coefficient of
resistivity obtained using the power law fitting was found to be 0.6. The
obtained Raman spectra at room temperature can be interpreted with the
tetragonal crystal structure and space group P4/nmm.Comment: conference pape
Marine Polysaccharides in Medicine
About 70% of the Earth\u27s surface is covered with seawater and 90% biosphere wraps maximum biodiversity that offers resourceful novel bio‐molecules. Marine species are enriched with organic compounds viz. terpenoids, polyethers/ketides, lipo‐glycoproteins, peptides and polysaccharides that act as cell surface receptors and involve in cell development/differentiation, besides being antimicrobial agents. Algae, sponge and fish have various defense mechanisms developed via specific/potent natural molecules to survive under hostile, extreme conditions such as various degrees of salinity, pressure, temperature, darkness, besides microbial and viral attacks. Marine seaweeds and algae enriched with polysaccharides such as glycosaminoglycans, agar, alginate and chitin/chitosan owing to their diversified significance have received growing attention among researchers. Currently, marine‐derived biomolecules cater 20% market drug load while other natural products bear 30% share. Chitins exhibit various biological and physicochemical properties that can be exploited in biotechnology and medicine/drug, cosmetic, food and textile industries. This chapter focuses on chitin/chitosan production, its physicochemical characterization and biological activities and relationship between its chemical structure and bio‐activity, including chemical modification reactions such as acylation, substitution, sulfonation and other cross‐linking strategies applied to skeletal modification with the recently updated literature
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