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Functional Response and Spatial Distribution of Aphid Parasitoid Aphelinus asychis
Young Woong Byeon,Midori Tuda,Jeong-Hwan Kim,Man-Young Choi 한국응용곤충학회 2010 한국응용곤충학회 학술대회논문집 Vol.2010 No.05
The functional response and spatial distribution of parasitoid may be useful for understanding host-parasitoid dynamics because information on these will give knowledge of the host-parasitoid interaction, which could lead to the development of strategy for biological control of insect pests. The functional responses of A. asychis on the green peach aphid and potato aphid was investigated in eggplant leaf-disc arena. As a result, among the three types of functional response, type III best described the A. asychis response to the aphid densities, according to the Bayesian Information Criterion (BIC). Functional response and spatial distribution of A. asychis on green peach aphid, Myzus persicae, was investigated on 5x5 eggplants in the net cage. After M. persicae were inoculated uniformly at the densities of 1, 3, 6, 9 and 12 (per plant) on upper, middle and lower leaves of each 25 eggplants, one mated female of A. asychis was introduced on the central eggplant. Each aphid density was duplicated. A. asychis showed a type II functional response different from that estimated on the eggplant leaf-disc arena. Although the initial distribution of the aphids in the 25 eggplants was uniform vertically and horizontally, the aphids became gradually concentrated on the upper leaves of eggplants, so did immature A. asychis.
Yang Zhong-qi,Choi Man-Young,Lee Hwi Jong,Byeon Young Woong 한국응용곤충학회 2014 한국응용곤충학회 학술대회논문집 Vol.2014 No.04
Anatatus orientalis is an important natural enemy parasitizing eggs of lanternfly Lycorma delicatula White. In order to effectively utilize this parasitoid, the parasitism rates of lantern-fly and emergence of its parasitoid were surveyed in different areas. Results showed that the emergences of wasp Anatatus orientalis from different areas had significant differences. Those parasitoids emerged from lantern-fly eggs collected from Yangling of Shaanxi province, Qinhuangdao of Hebei province, and Dagang District of Tianjin City came out focus on May only, while wasps from Yantai of Shandong province showed 2 obvious emergence peaks in May and September respectively. Wasp populations with emergence asynchrony in Yantai area were analyzed by different periods. Results revealed that the emergence percentages in spring (May) were significantly lower than that in fall (September), but the sex ratios did not differ significantly between the two seasons. The emergence asynchrony of parasitoid may be induced by the diapause of species, which is a long-term coevolutional outcome of parasitoid with host for maintaining its population. These findings provided some scientific bases for the rational utilization of this parasitoid in practice.
A Choroidal Schwannoma Confirmed by Surgical Excision
Young Jae Cho,Jung Bin Won,Suk Ho Byeon,Woo Ik Yang,Hyoung Jun Koh,Oh Woong Kwon,Sung Chul Lee 대한안과학회 2009 Korean Journal of Ophthalmology Vol.23 No.1
Schwannomas rarely present as intraocular tumors and are often misdiagnosed as malignant melanoma. We describe a choroidal schwannoma confirmed by sclerouvectomy. A 30-year-old woman presented with a large nonpigmented intraocular mass of the choroid in the right eye and underwent surgical excision by sclerouvectomy. Histologically, the tumor was composed of a mixture of cellular solid components (Antoni A) and loose myxoid components (Antoni B). The tumor was eventually diagnosed as a schwannoma. Currently available ancillary studies are still of little value in definitively differentiating schwannomas from other choroidal tumors. In the case of atypical findings for a malignant melanoma, a benign neoplasm should be included in the differential diagnosis. This patient avoided enucleation by first having the mass excised. We are unaware of previous reports in which a choroidal schwannoma was diagnosed by surgical excision.
Byeon, Suk Ho,Chu, Young Kwang,Hong, Young Taek,Kim, Min,Kang, Hae Min,Kwon, Oh Woong Lippincott 2012 Retina Vol.32 No.6
PURPOSE:: To describe the pathoanatomy of diabetic macular edema in optical coherence tomography and its correlation with fluorescein angiography patterns. METHODS:: Sixty eyes of 56 patients were analyzed. Diabetic macular edema was classified into typical focal leakage (from microaneurysm), typical diffuse leakage (the capillary plexus), or combined/questionable leakage using fluorescein angiography and retinal thickness profiles. The leakage and pooling patterns in fluorescein angiography were matched to the corresponding optical coherence tomography images and analyzed. RESULTS:: Focal leakage shows swelling predominantly in the outer plexiform layer (OPL). Deeply located microaneurysms directly leak into the loose fiber portion of OPL (Henle layer) through the “fluid conductivity barrier” (synaptic portion of OPL). Diffuse leakage caused swelling predominantly in the inner nuclear layer and secondarily in the OPL. The deep capillary plexus is located between the two “fluid barriers” (inner plexiform layer and OPL); thus, diffuse leakage is primarily related with swelling in the inner nuclear layer. In the combined/questionable leakage, partial sections consisting of inner nuclear layer swelling and much larger areas of OPL/outer nuclear layer swelling are noticed. CONCLUSION:: Based on the concept of the fluid conductivity barrier, we revealed a correlation between the intraretinal location of the leakage source and where the fluid accumulated within the retinal layers.
Chu, Young Kwang,Hong, Young Taek,Byeon, Suk Ho,Kwon, Oh Woong by Ophthalmic Communications Society, Inc. 2013 Retina Vol.33 No.10
PURPOSE:: To describe characteristic findings of acute retinal ischemic damage in optical coherence tomography. METHODS:: Eighteen cases of acute retinal arterial occlusion with available fundus photography, optical coherence tomography, and/or fluorescein angiography in the early phase (<1 month) with more than 2 months follow-up were reviewed. A site-to-site analysis between optical coherence tomography morphology and correlating fundus images were done on each visit. RESULTS:: Retinal opacities at first presentation were vague to mild opacity in four eyes, moderate (affecting visibility of underlying choroidal vessels) in seven, severe (yellow to whitish) in five, and very severe (chalky white) in two. These changes eventually disappear within 1 month (8 of 9 eyes). Inner retinal hyperreflectivity and a “prominent middle limiting membrane” in optical coherence tomography were consistently noticed up to 1 month showing regional correlation with the retinal opaque areas and was readily identified even in areas with vague or disappeared retinal opacities. Later, inner retinal atrophic changes replace these ischemic optical coherence tomography signs. CONCLUSION:: A prominent middle limiting membrane sign is a useful indicator of acute ischemic retinal damage, especially in cases showing subtle or resolved retinal opacities before the onset of atrophic changes.