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Lisa Kervin 경인교육대학교 교육연구원 2020 The Journal of Education Vol.3 No.2
The everyday use of digital technologies influences the literacy practices of young children and their families. Literate knowledge, skills, and understandings emerge through interactions between elements of the environment, artefacts or ‘tools’ (digital and non-digital), and people. As technologies become increasingly portable, affordable and efficient there is need to examine how digital experiences contribute to emergent literacy development. I draw upon the 2020 Australian COVID-19 experience which saw children and their families using technology in unprecedented ways. Using a television advertisement that showcased children at play, and was first seen during the isolation period, I look to how various semiotics including speech, colour, movement, image and sound work together to build our understanding of the potential for children’s digital literacy. Looking at this as an instance of social semiotics, I then use Engeström s (1993) activity theory to further understand digital experiences in home contexts as I examine the relationships between issues of access, the affordances of the digital resources, potential for interaction and literacy learning opportunities. Drawing upon these two theoretical perspectives enables an agenda to be set to more fully examine implications for digital literacy practices in home contexts.
Eric T. Johnson,Kervin O. Evans,Patrick F. Dowd 한국식물병리학회 2015 Plant Pathology Journal Vol.31 No.3
A small cationic peptide (JH8944) was tested for activity against a number of pathogens of agricultural crops. JH8944 inhibited conidium growth in most of the tested plant pathogens with a dose of 50 μg/ml, although one isolate of Fusarium oxysporum was inhibited at 5 μg/ ml of JH8944. Most conidia of Fusarium graminearum were killed within 6 hours of treatment with 50 μg/ ml of JH8944. Germinating F. graminearum conidia required 238 μg/ml of JH8944 for 90% growth inhibition. The peptide did not cause any damage to tissues surrounding maize leaf punctures when tested at a higher concentration of 250 μg/ml even after 3 days. Liposomes consisting of phosphatidylglycerol were susceptible to leakage after treatment with 25 and 50 μg/ ml of JH8944. These experiments suggest this peptide destroys fungal membrane integrity and could be utilized for control of crop fungal pathogens.
Johnson, Eric T.,Evans, Kervin O.,Dowd, Patrick F. The Korean Society of Plant Pathology 2015 Plant Pathology Journal Vol.31 No.3
A small cationic peptide (JH8944) was tested for activity against a number of pathogens of agricultural crops. JH8944 inhibited conidium growth in most of the tested plant pathogens with a dose of $50{\mu}g/ml$, although one isolate of Fusarium oxysporum was inhibited at $5{\mu}g/ml$ of JH8944. Most conidia of Fusarium graminearum were killed within 6 hours of treatment with $50{\mu}g/ml$ of JH8944. Germinating F. graminearum conidia required $238{\mu}g/ml$ of JH8944 for 90% growth inhibition. The peptide did not cause any damage to tissues surrounding maize leaf punctures when tested at a higher concentration of $250{\mu}g/ml$ even after 3 days. Liposomes consisting of phosphatidylglycerol were susceptible to leakage after treatment with 25 and $50{\mu}g/ml$ of JH8944. These experiments suggest this peptide destroys fungal membrane integrity and could be utilized for control of crop fungal pathogens.