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RISS 인기검색어
- 검색키워드
- 저자 : Yung-Ta Chang (검색결과 5 건)
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Kim, Changkyun,Shin, Hyunchur,Chang, Yung-Ta,Choi, Hong-Keun Botanical Society of America] 2010 American journal of botany Vol.97 No.6
<P>Polyploidy plays an important role in the speciation of Iso?tes. Increasing our knowledge about the specific origin of each polyploid or phylogenetic relationship among species has been hampered because of conserved morphological variation and scarce habitats. We present several hypotheses concerning the speciation pathways of Iso?tes species distributed in East Asia. Our hypotheses are inferred from phylogenetic relationships that were elucidated using sequences of the internal transcribed spacer regions of nuclear ribosomal DNA, a second intron of LEAFY, and chloroplast DNA trnS-psbC spacer regions. These inferred phylogenetic relationships indicated that (1) the Chinese tetraploid, I. sinensis, is closely related to I. yunguiensis; (2) the Korean endemic species, I. hallasanensis, is an autotetraploid derived from I. taiwanensis or closely related taxa; (3) the hexaploid I. coreana forms a clade and has its closest evolutionary relationships with I. taiwanensis or I. hallasanensis; and (4) the Japanese hexaploid I. japonica is closely related to I. taiwanensis-I. coreana and I. sinensis-I. yunguiensis. These results suggest that interspecific hybridization and polyploidization have played central roles in speciation of East Asian Iso?tes. Furthermore, I. taiwanensis, an endemic species in Taiwan, has been involved in at least three cases of autopolyploid or allopolyploid speciation in East Asia.</P>
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The number of cecidomyiid insect galls affects the photosynthesis of Machilus thunbergii host leaves
Meng-Yuan Huang,Hsueh-Mei Chou,Yung-Ta Chang,Chi-Ming Yang 한국응용곤충학회 2014 Journal of Asia-Pacific Entomology Vol.17 No.2
Previous studies of the impacts of galls on host leaf photosynthesis do not suggest any general trends, with a reportedrange of effects from negative to positive. In this study, photosynthetic characteristics such as chlorophyllfluorescence (Fv/Fm), photosynthetic capacity, and stomata conductancewere determined in two types of fruitlikegalls (red ovoid and green obovate galls) induced by Daphnephila taiwanensis and Daphnephila sueyenae, respectively,in order to investigate whether the number of galls affects the photosynthesis of galled leaves ofMachilus thunbergii. In 2008, chlorophyll fluorescence and photosynthetic capacity were negatively correlatedwith gall numbers, non-significantly and significantly, respectively,whereas stomata conductancewas positivelybut non-significantly correlated with gall numbers. In 2009, photosynthesis capacity and stomata conductancewere negatively, but non-significantly, correlated with gall numbers. Results imply that photosynthesis in M. thunbergii leaves is slightly affected by the number of cecidomyiid insect galls, and that the higher the gall number,the greater the negative effect that galls have on host leaf photosynthesis and subsequent infection.
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Meng-Yuan Huang,Chi-Ming Yang,Man-Miao Yang,Wann-Neng Jane,Yung-Ta Chang 한국응용곤충학회 2009 Journal of Asia-Pacific Entomology Vol.12 No.3
It has been postulated that grana stacking and destacking are mediated by the alteration of the surface charge density on the thylakoid membrane, which is regulated by the LHCII phosphorylation and dephosphorylation cycle. Insect-induced cecidomyiid galls, transformed from Machilus thunbergii Sieb & Zucc. (Lauraceae) leaves, are totally deficient in the pigment–protein complexes CPI and A1 of PSI and AB1 and AB2 of PSII. Although the galls are deficient in LHCII complex, grana stacking is normal. Our data suggest that the LHCII complex may not be the only factor responsible for grana stacking of thylakoid membranes.
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Herbivorous insects alter the chlorophyll metabolism of galls on host plants
Meng-Yuan Huang,Wen-Dar Huang,Hsueh-Mei Chouc,Chang-Chang Chen,Yung-Ta Chang,Chi-Ming Yang 한국응용곤충학회 2014 Journal of Asia-Pacific Entomology Vol.17 No.3
Five types of insect-induced galls derived from three host plant leaveswere analyzed for their carotenoid (Car), chlorophyll(Chl), and Chl biosynthesis porphyrins such as protoporphyrinogen IX (PPIX), magnesium protoporphyrin(MGPP) and protochlorophyllide (Pchlide), and Chl degradation intermediates including chlorophyllide (Chlide),pheophytin (Phe), pheophorbide (Pho), and phytylated and dephytylated pigments, and compared to ungalledportions of the same leaf. Galls contain significantly lower levels of Chl-related compounds (CRCs) than ungalledportions of host leaves. The mole percent of porphyrin and the ratios of Chlide/Phe and phytylated/dephytylatedpigments are both very different between galls and host leaves.We, therefore, conclude that leaf-derived gall is akind of non-leaf green tissue, that herbivorous insects alter gall Chl biosynthesis and degradation pathways, thatMg-chelatase, Mg-dechelatase, and chlorophyllase may be the major non-lethal enzymes in galls, and thatwhile ungalled host leaves take Chl → Phe → Pho and Chl → Chlide → Pho as the major and minor degradationroutes, respectively, all galls are in contrast with the host leaves.
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Fa-Po Chung,Chin-Yu Lin,Yenn-Jiang Lin,Shih-Lin Chang,Li-Wei Lo,Yu-Feng Hu,Ta-Chuan Tuan,Tze-Fan Chao,Jo-Nan Liao,Ting-Yung Chang,Shih-Ann Chen 대한심장학회 2018 Korean Circulation Journal Vol.48 No.10
Arrhythmogenic right ventricular dysplasia/cardiomyopathy (ARVD/C) is predominantly an inherited cardiomyopathy with typical histopathological characteristics of fibro-fatty infiltration mainly involving the right ventricular (RV) inflow tract, RV outflow tract, and RV apex in the majority of patients. The above pathologic evolution frequently brings patients with ARVD/C to medical attention owing to the manifestation of syncope, sudden cardiac death (SCD), ventricular arrhythmogenesis, or heart failure. To prevent future or recurrent SCD, an implantable cardiac defibrillator (ICD) is highly desirable in patients with ARVD/C who had experienced unexplained syncope, hemodynamically intolerable ventricular tachycardia (VT), ventricular fibrillation, and/or aborted SCD. Notably, the management of frequent ventricular tachyarrhythmias in ARVD/C is challenging, and the use of antiarrhythmic drugs could be unsatisfactory or limited by the unfavorable side effects. Therefore, radiofrequency catheter ablation (RFCA) has been implemented to treat the drug-refractory VT in ARVD/C for decades. However, the initial understanding of the link between fibro-fatty pathogenesis and ventricular arrhythmogenesis in ARVD/C is scarce, the efficacy and prognosis of endocardial RFCA alone were limited and disappointing. The electrophysiologists had broken through this frontier after better illustration of epicardial substrates and broadly application of epicardial approaches in ARVD/C. In recent works of literature, the application of epicardial ablation also successfully results in higher procedural success and decreases VT recurrences in patients with ARVD/C who are refractory to the endocardial approach during long-term follow-up. In this article, we review the important evolution on the delineation of arrhythmogenic substrates, ablation strategies, and ablation outcome of VT in patients with ARVD/C.
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