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National Institute of Food Technology Entrepreneurship and Management (NIFTEM)
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Journal of Biosciences, 2001
Genetic similarity and diversity of cultured catfishSilurus asotus populations collected from two... more Genetic similarity and diversity of cultured catfishSilurus asotus populations collected from two areas in western Korea were examined using randomly amplified polymorphic DNA-polymerase chain reaction (RAPD-PCR). Out of 20 random primers tested, 5 produced 1344 RAPD bands ranging from 8.2 to 13.6 polymorphic bands per primer. The polymorphic bands in these populations ranged from 56.4% to 59.6%. Polymorphic bands per lane within populations ranged from 4.9% to 5.3%. The similarity within the Kunsan population varied from 0.39 to 0.82 with a mean (± SD) of 0.56 ± 0.08. The level of bandsharing values was 0.59 ± 007 within the catfish population from Yesan. The genetic similarity in cultured catfish populations may have been caused because individuals from two populations were reared in the same environmental conditions or by inbreeding during several generations. However, in view of bandsharing values, polymorphic bands and also the specific major bands that were inter-population-specific, significant genetic differentiation between these populations were present even if bandsharing (BS) values were somewhat numerically different. Therefore, the number of RAPD polymorphisms identified in this study may be sufficient to permit estimating genetic similarity and diversity. However, in future, additional populations, sampling sites and individuals will be necessary to make up for these weak points.
As a part of the IGAC Mega-cities program, aerosol optical and chemical properties were continuou... more As a part of the IGAC Mega-cities program, aerosol optical and chemical properties were continuously measured from April 2007 to March 2008 at an urban site (37.57°N, 126.94°E) in Seoul, Korea. Aerosol light scattering and column integrated aerosol optical thickness (AOT) were measured by a nephelometer and a sky-radiometer, respectively. Particulate organic carbon (OC) and elemental carbon (EC) were also measured by a semi-continuous OC/EC monitor. Black carbon (BC) was also measured by a 7-wavelength aethalometer. Multiple scattering correction factor for aethalometer instrument was determined for each measurement date. Mixing state of EC was indirectly determined based on the BC/EC ratio in order to retrieve absorption coefficient of EC, babs from the aethalometer BC data. Mass absorption efficiency of EC at 550nm wavelength has been determined to be 9.1, 9.6, 10.0, and 10.0 m2/g during spring, summer, fall, and winter, respectively. Since the measurement site is located in the downwind area of Asian continental outflow, long-range transport Asian dust (AD) and pollution (LTP) particles frequently affect the local air quality. Ångström exponent of aerosol light extinction coefficient between 550 ~ 1020nm was determined to be <0.2 and >1.4 during AD and LTP periods, respectively. Based on the spectral optical scattering and absorption coefficients obtained, single scattering albedo (SSA) was determined as a function of wavelength for different seasons. This measured spectral signature of SSA can provide information about the chemical characteristics of atmospheric aerosol.
Journal of Biosciences, 2001
Genetic similarity and diversity of cultured catfishSilurus asotus populations collected from two... more Genetic similarity and diversity of cultured catfishSilurus asotus populations collected from two areas in western Korea were examined using randomly amplified polymorphic DNA-polymerase chain reaction (RAPD-PCR). Out of 20 random primers tested, 5 produced 1344 RAPD bands ranging from 8.2 to 13.6 polymorphic bands per primer. The polymorphic bands in these populations ranged from 56.4% to 59.6%. Polymorphic bands per lane within populations ranged from 4.9% to 5.3%. The similarity within the Kunsan population varied from 0.39 to 0.82 with a mean (± SD) of 0.56 ± 0.08. The level of bandsharing values was 0.59 ± 007 within the catfish population from Yesan. The genetic similarity in cultured catfish populations may have been caused because individuals from two populations were reared in the same environmental conditions or by inbreeding during several generations. However, in view of bandsharing values, polymorphic bands and also the specific major bands that were inter-population-specific, significant genetic differentiation between these populations were present even if bandsharing (BS) values were somewhat numerically different. Therefore, the number of RAPD polymorphisms identified in this study may be sufficient to permit estimating genetic similarity and diversity. However, in future, additional populations, sampling sites and individuals will be necessary to make up for these weak points.
As a part of the IGAC Mega-cities program, aerosol optical and chemical properties were continuou... more As a part of the IGAC Mega-cities program, aerosol optical and chemical properties were continuously measured from April 2007 to March 2008 at an urban site (37.57°N, 126.94°E) in Seoul, Korea. Aerosol light scattering and column integrated aerosol optical thickness (AOT) were measured by a nephelometer and a sky-radiometer, respectively. Particulate organic carbon (OC) and elemental carbon (EC) were also measured by a semi-continuous OC/EC monitor. Black carbon (BC) was also measured by a 7-wavelength aethalometer. Multiple scattering correction factor for aethalometer instrument was determined for each measurement date. Mixing state of EC was indirectly determined based on the BC/EC ratio in order to retrieve absorption coefficient of EC, babs from the aethalometer BC data. Mass absorption efficiency of EC at 550nm wavelength has been determined to be 9.1, 9.6, 10.0, and 10.0 m2/g during spring, summer, fall, and winter, respectively. Since the measurement site is located in the downwind area of Asian continental outflow, long-range transport Asian dust (AD) and pollution (LTP) particles frequently affect the local air quality. Ångström exponent of aerosol light extinction coefficient between 550 ~ 1020nm was determined to be <0.2 and >1.4 during AD and LTP periods, respectively. Based on the spectral optical scattering and absorption coefficients obtained, single scattering albedo (SSA) was determined as a function of wavelength for different seasons. This measured spectral signature of SSA can provide information about the chemical characteristics of atmospheric aerosol.