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Kyuheon Lee,Soon Ju Chung,Gukhoon Chung 한국원예학회 2005 Horticulture, Environment, and Biotechnology Vol.46 No.4
Bionatrol, specified emulsion nano-particle soybean oil, as a non-toxic natural bio-insecticide and minimum risk pesticide (US EPA, Canada PMRA regulation), was evaluated by field tests for insecticidal efficacy on two spotted spider mites (Tetranychus urtiae), aphids (Aphid gossypii), and whiteflies (Trialeurodes Vaporariorum) on greenhouse grown English cucumber (Cucumis ssp. kasa). Bionatrol had a relatively high mortality rate against insects. Phytotoxicity did not occur when Bionatrol at 0.2 and 0.3% was applied with an air blast sprayer. Net CO₂ assimilation on cucumber leaves was not reduced when Bionatrol was applied at concentrations of 0.2, 0.3, and 0.5%, but it was reduced by 4?6% with Bionatrol at 1 and 2%. Bionatrol reduced populations of the insects examined by 88?95%, but it had no harmful side effects on flowers, new and young leaves, and overall leaf growth of English cucumber.
Reports : Phytosphingosine promotes megakaryocytic differentiation of myeloid leukemia cells
( Sang Hee Han ),( Jusong Kim ),( Yerim Her ),( Ikjoo Seong ),( Sera Park ),( Deepak Bhattarai ),( Guanghai Jin ),( Kyeong Lee ),( Gukhoon Chung ),( Sungkee Hwang ),( Yun Soo Bae ),( Jaesang Kim ) 생화학분자생물학회 2015 BMB Reports Vol.48 No.12
We report that phytosphingosine, a sphingolipid found in many organisms and implicated in cellular signaling, promotes megakaryocytic differentiation of myeloid leukemia cells. Specifically, phytosphingosine induced several hallmark changes associated with megakaryopoiesis from K562 and HEL cells including cell cycle arrest, cell size increase and polyploidization. We also confirmed that cell type specific markers of megakaryocytes, CD41a and CD42b are induced by phytosphingosine. Phospholipids with highly similar structures were unable to induce similar changes, indicating that the activity of phytosphingosine is highly specific. Although phytosphingosine is known to activate p38 mitogen-activated protein kinase (MAPK)-mediated apoptosis, the signaling mechanisms involved in megakaryopoiesis appear to be distinct. In sum, we present another model for dissecting molecular details of megakaryocytic differentiation which in large part remains obscure. [BMB Reports 2015; 48(12): 691-695]