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Park Sang‐Hyun,Ha Young‐Ho,Kim Dong Eon,Kim Chang‐Jun,Choi Moon Bo 한국곤충학회 2021 Entomological Research Vol.51 No.3
Argentine ants (Linepithema humile) are one of the world’s most invasive species and were first reported in South Korea, near Busan Port in 2019. The distribution of their initial spread was investigated here from April to July 2020. In the invasion area, numerous nests and individuals were identified, indicating that they had settled and successfully invaded the habitat. To track the invasion of the Argentine ants we conducted haplotype analysis using COI, COII, and Cytb sequences of their mitochondrial DNA. The invasive ants had the same mitochondrial haplotype (H3) as Argentine ants from America (Chile, Ecuador, Bermuda) and East Asia (Japan). When comparing the import trade volumes at Busan port with the Argentine ant haplotypes from other countries, it was determined that the invasive ants may have originated from the United States or Japan. Numerous ecological and economic impacts due to their invasion and spread in other countries has previously been reported. Therefore, prompt control measures for the Argentine ants found at Busan port, at this relatively early stage of settlement, is required.
Park Sang‐Hyun,Moon Tae‐Young 한국곤충학회 2021 Entomological Research Vol.51 No.1
Cadaver insects cause dead bodies to break down in ecological processes. Still, the knowledge has been accumulated slowly about the structure and role of the insect assemblages attending to death scenes. This study analysed the successional patterns of insects on pig cadavers in the spring, summer, and autumn from 2016 to 2019 at Yeongdo Island, Busan, South Korea. A sum of 71 insect species belonging to four orders and 21 families were sampled. Predominant insects were largely Diptera and Coleoptera. The majority of the flies were the calliphorids as Chrysomya pinguis (Walker) and Lucilia porphyrina (Walker). The most common beetles were Creophilus maxillosus (L.), Omosita japonica (Reitter), and Staphylinidae sp. regardless of seasons. Occurrence matrices were made from the successional patterns of insect species during 42 sampling intervals in the spring, 38 sampling intervals in the summer, and 26 sampling intervals in the autumn. Permutation analyses of the occurrence matrices showed that the patterns of succession were similar between spring 2016 and 2017 (P = 0.019), between summer 2016 and 2017 (P = 0.003), and between autumn 2016 and 2019 (P = 0.002). The result shows that there are clear patterns in succession between seasons, and provides the reference data to presume the death time, at least in the southeast part of South Korea.
The impact of blowflies on pig cadaver decomposition on Yeongdo Island, Busan, South Korea
Park Sang‐Hyun,Baek Seung‐Ho,Moon Tae‐Young 한국곤충학회 2021 Entomological Research Vol.51 No.11
The decomposition process is an important factor in forensics, and flies play a crucial role in the decomposition of animals and humans. However, there remains limited information on the effect of flies that attend death scenes. This study assesses the effect of the presence or absence of blowflies on the rate and process of cadaver decomposition in the spring, summer, and autumn from 2016 to 2020 on Yeongdo Island, Busan, South Korea. Nine blowfly species belonging to four genera in two subfamilies were sampled. The blowflies that approached the cadavers differed between seasons, but Chrysomya pinguis (Walker) was the dominant species regardless of the season. Blowfly presence on cadavers significantly affected the duration of the decomposition stage and the pattern of weight loss in nearly all scenarios. With the presence of blowflies, the decomposition rate was four times faster in spring, three times faster in summer, and nine times faster in autumn. These results show that the presence or absence of blowflies is an essential factor in the decomposition process of cadavers. Therefore, it should be taken into account when estimating postmortem intervals in medicolegal forensic entomology.
Park Sang‐Hyun,Moon Tae‐Young 한국곤충학회 2020 Entomological Research Vol.50 No.4
It is noticed by some researchers that ants may cause some forensic confusion in understanding death scenes. In the aspect of relationship between the ant-animal decomposition, we observed the behavior of ants congregating on dead animals. Amongst various species of ants visiting dead rabbits, Tetramorium tsushimae Emery was noticeable in producing scratched scars, mounds, and nests around dead rabbits and covering them with soils. The behaviors are likely to interfere or to disturb the usual process of decomposition succession lead by maggots. We discussed that a series of cadaveric behaviors of T. tsushimae may be used as a potential forensic hint not to misunderstand death scenes disturbed by the species.
Two-dimensional Largest ovarian area to predict ovarian response in in vitro fertilization cycle
( Sang Don Kim ),( Byung Chul Jee ),( Chang Suk Suh ),( Seok Hyun Kim ),( Young Min Choi ),( Jung Gu Kim ),( Shin Yong Moon ) 대한산부인과학회 2010 Journal of Womens Medicine Vol.3 No.2
Objective: To evaluate the usefulness of two dimensional largest ovarian area (LOA) as a predictive parameter of oocyte yield and pregnancy in in vitro fertilization (IVF) cycle. Methods: Ninety-two stimulated IVF cycles from sixty-eight infertile women were included. On the day 3 of cycles, antral follicle count (AFC) and LOA were measured by ultrasonography before starting gonadotropins. LOA was calculated by ellipsoid formula (D1×D2×0.8) using two perpendicular diameters in the largest cross-sectional view of each ovary and then summed. Results: Both LOA and AFC had a positive correlation with the number of retrieved oocytes. The best cut-off value of LOA was 6.14 cm2 for predicting poor ovarian response (area under curve [AUC], 0.783; 95% confidence interval [CI], 0.684 to 0.862), 7.70 cm2 for predicting cycle cancellation (AUC, 0.794; 95% CI, 0.697 to 0.871) and 8.36 cm2 for predicting pregnancy (AUC, 0.641; 95% CI, 0.534 to 0.739). For AFC, the best cut-off value was 9 for poor ovarian response (AUC, 0.877; 95% CI, 0.792 to 0.936), 6 for predicting cycle cancellation (AUC, 0.942; 95% CI, 0.872 to 0.980) and 9 for pregnancy (AUC, 0.683; 95% CI, 0.578 to 0.776). The predictability for pregnancy was similar between LOA and AFC. Conclusion: LOA is easy to measure and a good marker for predicting ovarian response and IVF pregnancy.
Impairment of Lung function in postmenopausal Korean women with pelvic organ prolapse
( Hyun Joo Jung ),( Ga Won Yim ),( Myung Jae Jeon ),( Yeo Jung Moon ),( Sei Kwang Kim ),( Sang Wook Bai ) 대한산부인과학회 2009 Journal of Womens Medicine Vol.2 No.3
Objective: The most significant cause underlying pelvic organ prolapse is connective tissue abnormalities, which might be generalized rather than restricted to certain organs. This study was performed to determine whether lung function impairments were present in women with pelvic organ prolapse. Methods: This case-control study included 207 patients with pelvic organ prolapse and 207 age, height, and years postmenopausal, one-to-one matched controls. All subjects underwent lung function examination by spirometry. All subjects were postmenopausal without hormone replacement therapy, and without clinical signs or histories suggestive of disorders known to affect the pulmonary function. Results: There were significant decreases in the forced vital capacity and peak expiratory flow in the women with pelvic organ prolapse (P-value=0.049 and 0.019, respectively). Significant differences in mean forced vital capacity were found in patients with stage II-IV prolapse (P-value=0.047). There was a positive correlation between the forced vital capacity or peak expiratory flow and age at the time of the pelvic organ prolapse (P-value<0.001 and <0.001, respectively). Conclusion: Restrictive pulmonary impairment was aggravated in advanced stages of pelvic organ prolapse, and was worse if pelvic organ prolapse developed at a younger age.