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AN ANALYSIS OF A PREDATOR-PREY MODEL WITH LANDSCAPE FEATURES
Ana Yun,Junseok Kim,Jisun Lim 한국산업응용수학회 2011 한국산업응용수학회 학술대회 논문집 Vol.6 No.1
We present an analysis of a predator-prey model with landscape features. We give the analysis based on the Hopf bifurcation theory. Moreover, the wave speed for different values is given by means of both nonlinear analysis and numerical simulation for derivation of the phase equation. The obtained results show that numerical simulations are in agreement with mathematical analysis.
AN IMMERSED BOUNDARY METHOD FOR SIMULATING CELL GROWTH AND DIVISION
Yibao Li,Ana Yun,Junseok Kim 한국산업응용수학회 2011 한국산업응용수학회 학술대회 논문집 Vol.6 No.1
For an animal cell, cytokinesis is the process by which a cell divides its cytoplasm to produce two daughter cells. A new mathematical model has been developed for the simulation of cytokinesis. The proposed model is robust and realistic in deciding the position of the cleavage furrow. We use an immersed boundary method to track numerically the morphology of cell membrane during cell division process. We perform numerical simulations of axisymmetric cells to use sufficient resolution and see three-dimensional effects. We investigate the effects of each model parameters and compare a numerical result with the experimental data.
TRAVELLING WAVE SOLUTION IN REACTION-DIFFUSION EQUATIONS WITH ALLEE EFFECT
Jisun Lim,Ana Yun,Darae Jeong,Junseok Kim 한국산업응용수학회 2011 한국산업응용수학회 학술대회 논문집 Vol.6 No.2
We consider a reaction-diffusion system which describes the dynamics of the predator-prey interaction over a spatial bounded domain. We study the travelling wave solutions of the Lotka-Volterra equations with weak Allee effect type growth, in which the prey’s growth rate has an autocatalytic effect. It is known as Holling Type II predator functional response. The existence of travelling wave solutions is shown by means of bifurcation theorem. The stability of travelling wave solutions is established with singularly perturbed reaction-diffusion equations. The methods involve phase space investigation, invariant manifold and spectrum analysis. Numerical examples are provided to verify the main theoretical results.
The Arabidopsis SUMO E3 Iigase SIZ1 controls phosphate deficiency responses
Miura, Kenji,Rus, Ana,Sharkhuu, Altanbadralt,Yokoi, Shuji,Karthikeyan, Athikkattuvalasu S.,Raghothama, Kashchandra G.,Bae k, Dongwon,Koo, Yoon-Duck,Jin, Jing-Bo,Bressan, Ray A.,Yun, Dae-Jin,Hasegawa, Plant molecular biology and biotechnology research 2005 Plant molecular biology and biotechnology research Vol.2005 No.
Plants sense phosphate (Pi) deficiency and initiate signaling that controls adaptive responses necessary for Pi acquisition. Herein, evidence establishes that AtSIZ1 is a plant small ubiquitin-like modifier (SUMO) E3 ligase and is a focal controller of Pi starvation-dependent responses. T-DNA insertional mutated alleles of AtSIZ1(At5g60410) cause Arabidopsis to exhibit exaggerated prototypical Pi starvation responses, including cessation of primary root growth, extensive lateral root and root hair development, increase in root/shoot mass ratio, and greater anthocyanin accumulation, even though intracellular Pi levels in siz1 plants were similar to wild type. AtSIZ1 has SUMO E3 ligase activity in vitro, and immunoblot analysis revealed that the protein sumoylation profile is impaired in siz1 plants. AtSIZ1-GFP was localized to nuclear foci. Steady-state transcript abundances of Pi starvation-responsive genes AtPT2, AtPS2, and AtPS3 were moderate but clearly greater in siz1 seedlings that in wild type, where Pi is sufficient. Pi starvation induced the expression of these genes to the same extent in siz1 and wild-type seedlings. However, two other Pi starvation-responsive genes, AtlPS1 and AtRNS1, are induced more slowly in siz1 seedlings by Pi limitation. PHR1, a MYB transcriptional activator of AtIPS1 and AtRNS1, is as AtRNS1 sumoylation target. These results indicate that AtSIZ1 is a SUMO E3 ligase and that sumoylation is a control mechanism that acts both negatively and positively on different Pi deficiency responses.
The Arabidopsis SUMO E3 ligase SIZ1 controls phosphate deficiency responses.
Miura, Kenji,Rus, Ana,Sharkhuu, Altanbadralt,Yokoi, Shuji,Karthikeyan, Athikkattuvalasu S,Raghothama, Kashchandra G,Baek, Dongwon,Koo, Yoon Duck,Jin, Jing Bo,Bressan, Ray A,Yun, Dae-Jin,Hasegawa, Paul National Academy of Sciences 2005 PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF Vol.102 No.21
<P>Plants sense phosphate (Pi) deficiency and initiate signaling that controls adaptive responses necessary for Pi acquisition. Herein, evidence establishes that AtSIZ1 is a plant small ubiquitin-like modifier (SUMO) E3 ligase and is a focal controller of Pi starvation-dependent responses. T-DNA insertional mutated alleles of AtSIZ1 (At5g60410) cause Arabidopsis to exhibit exaggerated prototypical Pi starvation responses, including cessation of primary root growth, extensive lateral root and root hair development, increase in root/shoot mass ratio, and greater anthocyanin accumulation, even though intracellular Pi levels in siz1 plants were similar to wild type. AtSIZ1 has SUMO E3 ligase activity in vitro, and immunoblot analysis revealed that the protein sumoylation profile is impaired in siz1 plants. AtSIZ1-GFP was localized to nuclear foci. Steadystate transcript abundances of Pi starvation-responsive genes AtPT2, AtPS2, and AtPS3 were moderate but clearly greater in siz1 seedlings than in wild type, where Pi is sufficient. Pi starvation induced the expression of these genes to the same extent in siz1 and wild-type seedlings. However, two other Pi starvation-responsive genes, AtIPS1 and AtRNS1, are induced more slowly in siz1 seedlings by Pi limitation. PHR1, a MYB transcriptional activator of AtIPS1 and AtRNS1, is an AtSIZ1 sumoylation target. These results indicate that AtSIZ1 is a SUMO E3 ligase and that sumoylation is a control mechanism that acts both negatively and positively on different Pi deficiency responses.</P>
Jeong Joon Ahn,Ana Claiza Samayoa,Kyoung San Choi,Yun-Shiuan Wang,Sangwook Koh,Yu-Bing Haung,Shaw-Yhi Hwang 한국응용곤충학회 2018 한국응용곤충학회 학술대회논문집 Vol.2018 No.04
The oriental fruit fly is a major polyphagous insect pest with a worldwide distribution. The effects of temperature on stage-specific development were investigated at eight constant temperatures (13.0, 14.4, 16.2, 19.5, 23.8, 27.7, 31.8 and 34.8℃). Stage-specific lower developmental thresholds and thermal constants were determined using linear regression. The lower and higher temperature threshold (TL and TH) were estimated using the Sharpe-Schoolfield-Ikemoto (SSI) model. The daily adult emergence frequency of B. dorsalis was estimated in relation to adult age and temperature. Thermal performance was compared among B. dorsalis populations from different locations in Taiwan.