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Kazi A,Kader,Robert M,Hunger,Mark E,Payton 한국식물병리학회 2021 Plant Pathology Journal Vol.37 No.4
Prevalence of tan spot of wheat caused by the fungus Pyrenophora tritici-repentis has become more prevalent in Oklahoma as no-till cultivation in wheat has in- creased. Hence, developing wheat varieties resistant to tan spot has been emphasized, and selecting pathogen isolates to screen for resistance to this disease is critical. Twelve isolates of P. tritici-repentis were used to inocu- late 11 wheat cultivars in a greenhouse study in split- plot experiments. Virulence of isolates and cultivar resistance were measured in percent leaf area infection for all possible isolate x cultivar interactions. Isolates differed significantly (P < 0.01) in virulence on wheat cultivars, and cultivars differed significantly in disease reaction to isolates. Increased virulence of isolates de- tected increased variability in cultivar response (percent leaf area infection) (r = 0.56, P < 0.05) while increased susceptibility in cultivars detected increased variance in virulence of the isolates (r = 0.76, P < 0.01). A signifi- cant isolate × cultivar interaction indicated specificity between isolates and cultivars, however, cluster analysis indicated low to moderate physiological specialization. Similarity in wheat cultivars in response to pathogen isolates also was determined by cluster analysis. The use of diverse isolates of the fungus would facilitate evaluation of resistance in wheat cultivars to tan spot.
Induction of the Nuclear Proto-Oncogene c-fos by the Phorbol Ester TPA and c-H-Ras.
Kazi, Julhash U,Soh, Jae-Won Korean Society for Molecular Biology 2008 Molecules and cells Vol.26 No.5
<P>TPA is known to cooperate with an activated Ras oncogene in the transformation of rodent fibroblasts, but the biochemical mechanisms responsible for this effect have not been established. In the present study we used c-fos promoter-luciferase constructs as reporters, in transient transfection assays, in NIH3T3 cells to assess the mechanism of this cooperation. We found a marked synergistic interaction between TPA and a transfected v-Ha-ras oncogene in the activation of c-fos promoter and SRE. SRE has binding sites for TCF and SRF. A dominant-negative Ras (ras-N17) inhibited the TPA-Ras synergy by blocking the PKC-MAPK-TCF pathway. Dominant-negative RhoA and Rac1 (but not Cdc42Hs) inhibited the TPA-Ras synergy by blocking the Ras-Rho-SRF signaling pathway. Constitutively active PKCalpha and PKCepsilon showed synergy with v-Ras. These results suggest that the activation of two distinct pathways such as Ras-Raf-ERK-TCF pathway and Rho-SRF pathway are responsible for the induction of c-fos by TPA and Ras in mitogenic signaling pathways.</P>
Kazi Ahsan Habib,Amit Kumer Neogi,오진아,이윤호,김충곤 한국해양과학기술원 2019 Ocean science journal Vol.54 No.1
The new puffer fish species Chelonodontops bengalensis (Pisces: Tetraodontidae) is described from two specimens collected on the southwest coast of the Bay of Bengal, Bangladesh. C. bengalensis is closely related to C. patoca (Hamilton, 1822), both species being large puffers with a peculiar, disc-shaped exposed nasal organ. The new species however differs from C. patoca with respect to dorsal rays (12 vs 10), anal rays (10 vs 8), pectoral rays (19 vs 15–16) and gill rakers (8 vs 7). C. bengalensis has spinules on its lateral sides but not on the caudal peduncle (vs. a patch of spinules on the back from behind the interorbital nearly to the dorsal fin and another on the throat and abdomen but absent on the lateral sides in C. patoca). Both the DNA barcode region of the mitochondrial COI gene and 16S rRNA gene region of C. bengalensis showed a clear monophyletic clade that distinguishes it as a separate species in the phylogenetic tree from other closely related puffer fish species. The COI barcode region shows a genetic divergence of 6 to 7.6% between C. bengalensis and C. patoca reported in GenBank from different parts of Asia.
Mechanical Properties of Carbon Nanotubes with Randomly Distributed Vacancy Defects
Kazi Tunvir,Seung Hoon Nahm,Amkee Kim,이학주 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.III
Carbon nanotubes (CNTs) offer very high mechanical properties with huge scatter. The scatter in the properties is believed to occur mainly due to the defects originated inherently during production. CNTs under a tensile load having randomly distributed vacancy defects are simulated to investigate the effect of the spatial distribution of defects on the mechanical properties. A simple random unit generation method was used to allocate the defects randomly in the single-walled nanotube's structure. The simulation was carried out a using classical molecular dynamics (MD) simulation technique in atomic scale. Defect density of 1 \% reduced the failure strength, the failure strain and Young's modulus of CNTs by as much as 42 \%, 65 \% and 2 \%, respectively, while a defect density of 8 \% lowered the properties by as much as 52 \%, 71 \% and 14 \%, respectively. The scatter in the properties due to the random distribution of the defects was found to increase with increasing number of defects in the SWNTs. For example, for a defect density of 8 \%, the standard deviations of the data for 20 sample simulations having different distributions normalized to the mean values calculated for the failure strength, the failure strain and Young's modulus were about 11 \%, 20 \% and 8 \%, respectively. The defect arrangement in the SWNT's structure is one of the key factors in determining its mechanical properties and the population of defects.
Population genetic structure and demographic history of the fat greenling Hexagrammos otakii
Kazi Ahsan Habib,정다금,Jung-Goo Myoung,Min Seok Kim,장요순,Jae Seol Shim,Youn-Ho Lee 한국유전학회 2011 Genes & Genomics Vol.33 No.4
Fat greenling (Hexagrammos otakii) is an important commercial fish in the Northwestern Pacific, being distributed along the coastal waters of the East/Japan Sea and the Yellow Sea. To investigate population genetic structure and demographic history of this species, one hundred and fifty five individuals were collected from five localities in the distribution range of the species and sequence variations in the mitochondrial genes COI, COIII-ND3-ND4L, and cytochrome b were examined. For all the genes in every sampling location, the nucleotide diversities were very low (0.001 ~ 0.005) although the haplotype diversities were relatively high, 0.55 ~ 0.81 for COI, 0.79 ~ 0.84 for COIII-ND3-ND4L, and 0.95 ~ 0.97 for cytochrome b. Hierarchical analysis of molecular variance (AMOVA), the conventional population statistic FST, and exact test of population differentiation revealed no significant genetic structuring among the samples, indicating that fat greening is panmictic throughout the range of its distribution. Neutrality tests such as Tajima’s D and Fu’s FS statistics and mismatch distribution analyses suggested that fat greening has undergone the demographic history of population expansion during the late Pleistocene period approximately 91,000 ~327,000 years ago. The star-burst patterns of haplotype networks and low nucleotide diversities also indicated recent population expansion. These results help establish the fisheries management strategy for fat greenling in the Northwestern Pacific.
Ecotourism Carrying Capacity and the Potentiality of the Safari Park of Bangladesh
Kazi Mohammad Masum,Abdullah Al Mamun,Zahed Mohammad Malekur Rahman,Md. Motlubur Rahman,Md. Shah Newaz,Mohammad Redowan 강원대학교 산림과학연구소 2013 Journal of Forest Science Vol.29 No.4
The study was undertaken to assess the tourist’s carrying capacity and to explore ecotourism potential of Bangabandhu Sheikh Mujib Safari Park, the only safari park of Bangladesh. Carrying capacity was assessed both from physical and social aspect. On the other hand, 250 visitors were interviewed with semi structured questionnaire for ecotourism prospect evaluation along with some secondary data. The total daily-allowed visit was 17,300 with rotation coefficient of 3.46. Maximum daily average numbers of tourists were relatively below the physical carrying capacity of the Park (5,000). The social carrying capacity was 4.38 persons per day. As there are different categories of visitors, their choice of encounters and number of expected encounters also varied. Each year, the total tourist’s number varied significantly (p≤0.05). That proved the safari park had immense tourist prospect. 85 percent visitors were from lower and middle class family as entrance fees and other fees inside were very cheap in relation to other private amusement place. The ecological perspective of the park will remain unaltered if the carrying capacities of the area are followed with sustainability. Therefore, it is the proper time for taking appropriate decision.
Kazi Mohammad Masum,Md. Mehedi Hasan 강원대학교 산림과학연구소 2020 Journal of Forest Science Vol.36 No.3
Satchari National Park is one of the most biodiverse forest in Bangladesh and home of many endangered flora and fauna. 206 tons of CO2 per hectare is sequestrated in this national park every year which helps to mitigate climate issues. As people living near the area are dependent on this forest, degradation has become a regular phenomenon destroying the forest biodiversity by altering its forest cover. So, it is important to map land cover quickly and accurately for the sustainable management of Satchari National Park. The main objective of this study was to obtain information on land cover change using remote sensing data. Combination of unsupervised NDVI classification and supervised classification using maximum likelihood is followed in this study to find out land cover map. The analysis showed that the land cover is gradually converting from one land use type to another. Dense forest becoming degraded forest or bare land. Although it was slowed down by the establishment of ‘National Park’ on the study site, forecasting shows that it is not enough to mitigate forest degradation. Legal steps and proper management strategies should be taken to mitigate causes of degradation such as illegal felling.