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- 저자 : Bishnu Kumar Pandey (검색결과 2 건)
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Photo Physical Studies of PVP Arrested ZnS Quantum Dots
Ashutosh Kumar Shahi,Bishnu Kumar Pandey,Bheeshma Pratap Singh,Bipin Kumar Gupta,Sukhvir Singh,Ram Gopal 대한금속·재료학회 2017 ELECTRONIC MATERIALS LETTERS Vol.13 No.2
Monodispersed polyvinylpyrrolidone (PVP) arrested ZnS quantumdots (QDs) having diameter in range ~2-5 nm are synthesized by acolloidal precipitation method using PVP as the stabilizing agent. X-ray diffraction (XRD), transmission electron microscopy (TEM),high resolution transmission electron microscopy (HRTEM),selective area electron diffraction (SAED) and Fourier transforminfrared (FT-IR) spectroscopy are probed to investigate thestructural information. The optical properties are studied usingdiffuse UV-visible reflectance and photoluminescence (PL)spectroscopy techniques. TEM images as well as XRD reflectionpeak broadening indicate the nanometer size particles formationwith cubic (sphalerite) phase within the polymer matrix. Opticalabsorbance studies reveal an excitonic peak at around ~310 nmdictates the effect of quantum confinement effect in the ZnS QDs. PL emission spectra for ZnS QDs in PVP exhibit four emissionpeaks at ~382 nm, ~414 nm, ~480 nm and ~527 nm are observed. These excitonic emissions from ZnS QDs are caused by theinterstitial sulfur/Zn vacancies and surface states.
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Pandey Bishnu Prasad,Pradhan Suman Prakash,Adhikari Kapil,Shresth Rajib Kumar 한국미생물학회 2021 미생물학회지 Vol.57 No.3
Streptomyces are widely distributed in soil and known for the production of bioactive secondary metabolites. It has been reported that among microbial-derived antibiotics, two-third are produced by the Streptomyces species alone. Hence, continuous screening of the Streptomyces species is of growing scientific interest. A small Himalayan country like Nepal is in a unique geographical location with a huge biodiversity. However, little is known about microbial diversity. The aim of this study was to isolate and characterize the Streptomyces species from a high-altitude soil sample collected from an altitude of 4,380 meters above sea level. The 16S rRNA sequence analysis revealed that four isolated strains; G-10, G-14, G-18, and S4L belong to the Streptomyces species. On the basis of phylogenetic analysis of 16S rRNA gene sequences of the isolates with the best match in the database revealed that G-18 isolates closely related to Streptomyces albidoflavus strain PAS-12. Moreover, the ranges of radical scavenging activities by crude extract of isolates were observed against DPPH and ABTS. Furthermore, crude extract of isolates revealed the range of antimicrobial activities against the four pathogenic strains namely Klebsiella pneumoniae, Staphylococcus aureus, Enterococcus species, and Bacillus substilis. Moreover, isolated Streptomyces species revealed amylase, cellulase, and L-asparaginase enzyme activities.
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