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Basanta Kumar Das,Ji Gang Kim 한국원예학회 2010 Horticulture, Environment, and Biotechnology Vol.51 No.4
The combined effect of washing solutions and heat treatment was investigated as potential sanitizers for maintaining the quality and microbial safety of fresh-cut paprika. Freshly collected red colored paprika fruits were cut into 2 × 5cms pieces, washed in 1% calcium chloride and 6% calcium ascorbate (NatureSeal <SUP>TM</SUP>, USA) combined with 19℃ (control) and 50℃ water temperature for 2 minutes. Then, samples were packaged in 30 ㎛ polypropylene bags and stored at 5℃ for 12 days. Various quality and safety parameters like gas composition, electrical conductivity, off-odor, color, texture, and microbial numbers were evaluated during storage. No significant differences were observed in color, gas composition, texture and no off-odor detected among water temperature and washing solutions. However, 50℃ water temperature with calcium ascorbate or calcium chloride had lower microbial numbers up to the end of storage period in comparison with tap water. The result reveals that 50℃ water temperature with calcium ascorbate or calcium chloride can be used as a washing solution to maintain the microbial quality in fresh-cut Paprika fruits.
Synthesis and Characterization of Copper Nanoparticles by Using the Exploding Wire Method
Rashmita Das,Basanta Kumar Das,Anurag Shyam 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.5
During the past few years, the synthesis of copper nanoparticles has attracted much attention because of their huge potential for replacing the expensive nano silver inks utilized in conductive printing. This opens a new possibility in printed electronics. Copper-based inkjet inks can be used to form various devices such as solar cells, RF identification tags and electroluminescence devices. This paper describes controlled synthesis of pure copper nanoparticles, mainly by using the exploding wire method. A wire of 0.26 mm in diameter was exploded in a nitrogen environment. The sample was characterized by using X-ray diffraction (XRD) and atomic force microscopy (AFM). XRD revealed the presence of pure copper and AFM revealed the presence of nanoparticles with an average size of 55 nm.
Ji Gang Kim,Basanta Kumar Das,Seon Woo Cha,Yong Phil Kim,Won-Sik Kong 한국버섯학회 2010 한국버섯학회지 Vol.8 No.4
This study was conducted to determine changes in quality and microbial population of intact and fresh-cut button mushrooms (Agaricus bisporus). Freshly collected mushroom was cut into approximately 0.5 cm thick slices and washed in tap water or 100 ㎕L-1 chlorine solution (pH 7) for 60 seconds. Intact mushrooms were washed in the same condition as cut samples. Both intact and fresh-cut samples were then dried, packaged in 50㎛ poly ethylene bags, and stored at 5 ℃ for up to 9 days. Quality and microbial safety parameters such as gas composition, color, off-odor, visual quality, electrical conductivity, E. coli / coliform count, and total aerobic population were evaluated during storage. All sample packages exhibited a rapid depletion of O2 (to ~0 kPa) and accumulation of CO2 (10.3 to 12.6 kPa) throughout the storage period. No significant color difference was found between tap water and chlorine. However, chlorine treatment was effective in reducing off-odor development of intact and fresh-cut samples at the end of storage. The chlorine application also reduced aerobic bacterial populations. Both Intact and cut mushrooms had ≤ 5 log CFU/g of total aerobic plate counts until the end of storage. Fresh-cut samples regardless of chlorine sanitation had higher overall visual quality score than intact samples. Results indicated that fresh-cut mushrooms treated with chlorine maintained quality and shelf-life throughout the 9 day storage period.
Molecular Markers: It's Application in Crop Improvement
Kesawat, Mahipal Singh,Das, Basanta Kumar 한국작물학회 2009 Journal of crop science and biotechnology Vol.12 No.4
Over the past few decades, plant genomics research has been studied extensively bringing about a revolution in the field of plant biotechnology. Molecular markers, useful for plant genome analysis, have now become an important tool in crop improvement. The development and use of molecular markers for the detection and exploitation of DNA polymorphism is one of the most significant developments in the field of molecular genetics. The presence of various types of molecular markers, and differences in their principles, methodologies and applications require careful consideration in choosing one or more of such methods. No molecular markers are available yet that fulfill all requirements needed by researchers. In this article we attempt to review most of the available DNA markers that can be routinely employed in various aspects of plant genome analysis such as characterization of genetic variability, genome fingerprinting, genome mapping, gene localization, analysis of genome evolution, population genetics, taxonomy, plant breeding, and diagnostics. The emerging patterns make up a unique feature of the analyzed individual and are currently considered to be the ultimate tool for biological individualization.
Isolation and Characterization of Lipopolysaccharides from Different Rhizobial Isolates
Mahipal Singh Kesawat,Basanta Kumar Das,GR Bhaganagare,Vinay Sharma,Manorama 한국작물학회 2009 Journal of crop science and biotechnology Vol.12 No.3
Formation of nodules on roots or in stems (in some cases) of leguminous plants is the unique ability of gram-negative bacteria, Rhizobia, which converts atmospheric nitrogen into usable forms by the host plant. Lipopolysaccharide (LPS) is the outer membrane component of the gram-negative bacteria, known to be an essential factor in host recognition, specificity, and initial infection processes. In the present study, we extracted lipopolysaccharides from different rhizobial isolates by a modified phenol-water method and partially characterized by polyacrylamide gel electrophoresis with silver staining. The results showed two separate banding regions, LPS-I and LPS-II. The high molecular weight and electrophoretic mobility of LPS-I region resembles that of lysozyme, used as a standard marker. The LPS-II region has a low molecular weight and electrophoretic mobility greater than that of lysozyme. The LPS-II region was due to incomplete LPS, which either lacks the entire O-antigen repeating unit or contains only one or two repeating units. The banding patterns of LPS vary among the different rhizobial isolates. Results revealed that the type of LPS structure and banding regions greatly facilitate the further characterization of the LPS modifications required for symbiosis. Formation of nodules on roots or in stems (in some cases) of leguminous plants is the unique ability of gram-negative bacteria, Rhizobia, which converts atmospheric nitrogen into usable forms by the host plant. Lipopolysaccharide (LPS) is the outer membrane component of the gram-negative bacteria, known to be an essential factor in host recognition, specificity, and initial infection processes. In the present study, we extracted lipopolysaccharides from different rhizobial isolates by a modified phenol-water method and partially characterized by polyacrylamide gel electrophoresis with silver staining. The results showed two separate banding regions, LPS-I and LPS-II. The high molecular weight and electrophoretic mobility of LPS-I region resembles that of lysozyme, used as a standard marker. The LPS-II region has a low molecular weight and electrophoretic mobility greater than that of lysozyme. The LPS-II region was due to incomplete LPS, which either lacks the entire O-antigen repeating unit or contains only one or two repeating units. The banding patterns of LPS vary among the different rhizobial isolates. Results revealed that the type of LPS structure and banding regions greatly facilitate the further characterization of the LPS modifications required for symbiosis.