Macro and Micro-fungi mediated synthesis of Silver

Silver nanoparticles of size ranging from 1 ∼ 100 nm are petite metallic colloidal particles, with its applications in diagnostics, biomarkers, imaging, cell labeling and drug delivery. Fungus-mediated synthesis of silver nanoparticles is an ecofriendly andgreen process with a comparatively simpler downstream processing. In the presentstudy, the ability of macrofungi and pine stand soil fungi was evaluated for their ability tosynthesize both extracellular as well as intracellular silver nanoparticles. When the macroand microfungi were challenged with 1 mM silver nitrate, colour change of the cell freefiltrates indicated the formation of silver nanoparticles. The presence of silvernanoparticles was confirmed by Surface Plasmon Resonance absorption band in visiblewavelength visualized every 24h upto 72h.Silver nanoparticles are known to possess asharp peak in a range of 400-450 nm and peaks observed at 457nm, 403nm and 414nm bymushroom support their synthesis in comparison to that of 349nm by soil fungi.Transmission Electron Microscopic analysis of the silver nanoparticles revealed thenanorange, dimensions and structural conformation ofbio synthesized nanoparticles.Synergistic study of the synthesized nanoparticles revealed a significant antibacterialactivity against four pathogens viz. MTCC 730 (Escherichia coli), MTCC 1925(Streptococcus pyogenes), MTCC 96 (Staphylococcus aureus) and MTCC 430 (Bacilluscereus).Additionally, the silver nanoparticles inhibited the growth of the yeastpathogen MTCC 183 (Candida albicans) which showed synergistic enhancement inactivity along with flucanazole. The fungal samples were analyzed for phytochemicalconstituents who led to reduction of silver nitrate into nanoparticles. The results obtainedindicated that the experimental voucher fungus are more competent than soil fungi insynthesizing silver nanoparticles and can be used a potent natural antibacterial source forvarious pharmaceutical and textile applications

Probing gas and dust in the tidal tail of NGC 5221 with the type Ia supernova iPTF16abc

Context. Type Ia supernovae (SNe Ia) can be used to address numerous questions in astrophysics and cosmology. Due to their well known spectral and photometric properties, SNe Ia are well suited to study gas and dust along the lines-of-sight to the explosions. For example, narrow Na I D and Ca II H&K absorption lines can be studied easily, because of the well-defined spectral continuum of SNe Ia around these features. Aims. We study the gas and dust along the line-of-sight to iPTF16abc, which occurred in an unusual location, in a tidal arm, 80 kpc from centre of the galaxy NGC 5221. Methods. Using a time-series of high-resolution spectra, we examine narrow Na I D and Ca II H&K absorption features for variations in time, which would be indicative for circumstellar (CS) matter. Furthermore, we take advantage of the well known photometric properties of SNe Ia to determine reddening due to dust along the line-of-sight. Results. From the lack of variations in Na I D and Ca II H&K, we determine that none of the detected absorption features originate from the CS medium of iPTF16abc. While the Na I D and Ca II H&K absorption is found to be optically thick, a negligible amount of reddening points to a small column of interstellar dust. Conclusions. We find that the gas along the line-of-sight to iPTF16abc is typical of what might be found in the interstellar medium (ISM) within a galaxy. It suggests that we are observing gas that has been tidally stripped during an interaction of NGC 5221 with one of its neighbouring galaxies in the past $\sim10^9$ years. In the future, the gas clouds could become the locations of star formation. On a longer time scale, the clouds might diffuse, enriching the circum-galactic medium (CGM) with metals. The gas profile along the line-of-sight should be useful for future studies of the dynamics of the galaxy group containing NGC 5221.Comment: 8 pages, 6 figure

Modeling of Photovoltaic Array

Day-by-day the energy demand is increasing and thus the need for a renewable source that will not harm the environment are of prime importance. Some projections state that by 2050 the energy demand will triple. Yet majority of the energy requirements is satisfied by fossil fuels but by the use of photovoltaic systems could help in supplying the energy demands. In this project we have dealt with problem that persists with the modeling of photovoltaic device. The problem that various models of photovoltaic device face is the number of unknown parameters which are not mentioned in the datasheet. Various methods have been proposed in order to determine these unknown parameters. Basically, in this project, two of the proposed methods are being studied and then compared. This can give a brief idea to the manufacturers who design power electronics products about the easy-to-use modeling methods that can be used in simulation of photovoltaic arrays

Artisans of Meitei-Pangal/Pangal Community (Muslims) in the Making of Some Bamboo Tools and it’s Implements and Their Role in the Conservation of Bio-Resource in Manipur

Tools and itrsquos implements especially of bamboos have been searched, took photograph and documented their useful aspects. T3he information of artisans in relation with the tool creation by bamboo plants and their view of earning family income in deference with their traditional knowledge have been recorded during a study period (January, 2012 to Nov. 2014). A total of 3 genus 8 bamboo species useful in 5 (five) categories of human affairs i. e. Agriculture amp Horticulture, Fishery, House making, Weaving and Others (household) to make tool amp itrsquos implements has been recorded.nbsp The plants are Dendrocalamus sericious Munro.(Ui), D.longifimbriatus Gamble.(Unan), D.giganteus Munro.(Marubob/Mareebob), B. tulda Roxb. (Saneibi), B. nana Roxb., B. kingiana Gamble (Watangkhoi), B.nutans Wall Ex. Munro.(Oootang) and Melocanna bambusoides Trin. (Moubi).nbsp The plants have been found to be conserved in the villages. It is believed that the long tradition of bamboo plantation has been converted to useful bio-resources of bamboo stalks in the villages

A microwave promoted and Lewis acid catalysed solventless approach to 4-azasteroids

The preparation of 3-oxo-4-azasteroid fromA-nor-3,5-secosteroid-3-oic acid is described in a solventless condition catalysed by Lewis acid under microwave irradiation.We utilized urea as an environmentally benign source for the generation of ammonia for the aza cyclization reaction

Acidity & Catalytic Activity of Modified Zeolite-X

554-55

Mechanical Ventilator for Delivery of 17O2 in Brief Pulses

The 17O nucleus has been used recently by several groups for magnetic resonance (MR) imaging of cerebral metabolism. Inhalational delivery of 17O2 in very brief pulses could, in theory, have significant advantages for determination of the cerebral metabolic rate for oxygen (CMRO2) with MR imaging. Mechanical ventilators, however, are not typically capable of creating step changes in gas concentration at the airway. We designed a ventilator for large animal and human studies that provides mechanical ventilation to a subject inside an MR scanner through 25 feet of small-bore connecting tubing, and tested its capabilities using helium as a surrogate for 17O2. After switching the source gas from oxygen to helium, the 0-90% response time for helium concentration changes at the airway was 2.4 seconds. The capability for creating rapid step changes in gas concentration at the airway in large animal and human studies should facilitate the experimental testing of the delivery 17O2 in brief pulses, and its potential use in imaging CMRO2