Fabrication of electrospun BMIMPF₆/nylon 6,6 nanofibers and their application in the organic vapour sensing

강은수,심상은 한국공업화학회 2010 한국공업화학회 연구논문 초록집 Vol.2010 No.1

Application of PMIPF₆/PA 6, 6Nanofibers as an Organic Vapor Sensing Material

강은수,심상은 한국공업화학회 2010 한국공업화학회 연구논문 초록집 Vol.2010 No.-

미기록 외래식물 모래별꽃(Stellaria palida), 들별꽃(S. ruderalis), 애기점나도나물(Cerastium pumilum)의 보고

강은수,김진숙,김선민,이강협,손동찬,Eun Su Kang,Jin Suk Kim,Seon Min Kim,Kang-Hyup Lee,Dong Chan Son 한국자원식물학회 2023 한국자원식물학회지 Vol.36 No.4

Stellaria pallida (Dumort.) Crép., S. ruderalis M. Lepší, P. Lepší, Z. Kaplan & P. Koutecký, and Cerastium pumilum Curtis are unrecorded alien species of Caryophyllaceae found in Seoul and Gyeonggi-do in the Republic of Korea. Stellaria pallida is readily distinguished from other taxa in the same genus by its petals, as it's considerably smaller than the sepals or absent. In contrast, S. ruderalis is difficult to identify as it has intermediate traits between S. media L. and S. neglecta (Lej.) Weihe. However, S. ruderlais clearly identified by seed morphology, and S. ruderalis, unlike S. media and S. neglecta, has conical shape of outer periclinal wall and papillate on the basely surface of that. Cerastium pumilum is similar to C. glomeratum Thuill. and belongs to the same subgenus (Sub gen. Fugacia); however, it has some distinct characteristics, including stamens that are primarily 8 (5-10), upper bracts with membranous edges, and the length of the pedicels and petals being longer than that of the sepals. The three of alien plants was recorded for the first time in this study, and information of their habitat, distribution map, description and photographs are presented.

Re-identification of herbarium specimens through a morphological analysis reveals two species of <i>Murdannia</i> (Commelinaceae) from South Korea

강은수,이강협,지성진,손동찬 한국식물분류학회 2024 식물 분류학회지 Vol.54 No.1

The previously reported alien plant <i>Murdannia nudiflora</i> is known to be distributed on Jejudo Island and in inland areas of South Korea. However, the species distributed in the Jejudo Island region exhibits differences in the morphology of the stems, leaves, and seeds compared to those in inland areas. Although <i>M. loriformis</i> is morphologically similar to <i>M. nudiflora</i>, it differs in terms of the development of the main stem, the formation of rosettes, and the occurrence of inflorescences that develop from branched stems. The seed testa of <i>M. loriformis</i> exhibits a radiating striated pattern and is not verrucose. Through the re-identification of specimens of <i>M. nudiflora</i> and an examination of individuals and images collected in areas of their distribution, it was determined that the individuals in the Jejudo region are <i>M. loriformis</i>, whereas those distributed inland were found to be <i>M. nudiflora</i>. This study presents revised descriptions and a taxonomic key for both species, with new Korean names designated based on the characteristics of the distribution areas and surrounding growth environments.

Electrospun BMIMPF6/Nylon 6,6 Nanofiber Chemiresistors as Organic Vapour Sensors

강은수,심상은,김민재,오정석,박동화 한국고분자학회 2012 Macromolecular Research Vol.20 No.4

Nylon 6,6 nanofiber containing an ionic liquid, 1-butyl-3-methylimidazolium hexafluorophosphate (BMIMPF6), was prepared via electrospinning and used as a chemiresistor for detecting organic vapors, such as methanol, ethanol, tetrahydrofuran (THF), and acetone. The diameter of the nanofibers was varied by changing the concentration of BMIMPF6 by changing the solution viscosity and surface tension. The surface resistivity of the nanofibers decreased with increasing amounts of BMIMPF6. When the hybrid nanofibers were collected on an interdigitated electrode and exposed to solvent vapors, the resistance suddenly decreased upon exposure to all of the solvent vapors at room temperature. In contrast, the resistance dramatically increased when the organic vapors were removed. The stable cyclic test reveals that the ionic liquid containing nylon nanofiber can be used as a useful sensing material for organic vapors.

Ipomoea heptaphylla and Murdannia nudiflora: New records for the flora of Korea

강은수,김창욱,손동찬,임민영,지성진 한국식물분류학회 2023 식물 분류학회지 Vol.53 No.3

Ipomoea heptaphylla Sweet and Murdannia nudiflora (L.) Brenan have been discovered on arable land on Jejudo Island, Korea. Ipomoea heptaphylla can easily be dis- tinguished from other Korean Ipomoea species by certain distinctive features, which include thin and coiled long pedicels, small corollas, and, most importantly, palmatisect leaves with five to seven lobes. Murdannia nudiflora is characterized by the absence of a rhizome, the presence of caducous bracteoles, by its bearing of more than one flower, and by its fruits with two seeds per valve and foveolate-reticulate seeds, distinguishing it from M. keisak. In this study, we report the plants I. heptaphylla and M. nudiflora and provide their morpho- logical descriptions, photographs, distribution, and keys.

국내 외래식물의 현황

강은수,이수랑,오승환,김동갑,정수영,손동찬 한국식물분류학회 2020 식물 분류학회지 Vol.50 No.2

Species invasions have rapidly increased due to the substantial growth of global trade in the recent past. As the awareness of the negative effects on natural ecosystems derived from alien species has grown, many countries and lawmakers have enacted rules and policies on the conservation of indigenous plants. Unfortunately, in Korea, research on species invasion is seriously lacking despite the growing number of alien species. In the current study, we report alien plants that have intentionally and/or unintentionally been introduced in Korea and also presented a checklist of invasive plants found both in the literature and in field surveys. We reviewed all documented records of alien plants, i.e., scientific papers, illustrated books, and annual reports. We also categorized alien plants by origin, time of introduction, naturalization, and the rate of their spread. The results revealed that there are 619 alien plant taxa (96 families, 353 genera, 595 species, 6 subspecies, 11 varieties, 1 forma, and 6 hybrids) occurring in Korea. Among these, 30 taxa are archaeophytes (Arc.), 214 are potentially invasive plants (PIPs), and 375 are invasive alien plants (IAPs). In addition, IAP taxa consist of grades 5 (widespread, WS) to 1 (potential spread, PS) of alien plants according to the rate of spread in Korea. Our results suggested that the number of alien plants is likely to keep growing; thus, the distribution should be regularly monitored and the list of alien plants must be updated. 세계화에 따른 국제교류가 증가함에 따라 외래식물의 국내 유입 또한 증가하고 있다. 외래식물이 자 연생태계에 미칠 수 있는 여러 부정적인 영향들이 알려지면서 전 세계적으로 자생식물의 보전을 위한 국가 차원의 관리 및 여러 정책들이 수행되고 있지만, 국내의 경우 이들의 현황 파악조차 미흡한 실정이다. 본 연 구는 국립수목원에서 수행하는 ‘외래식물 다양성 변화 및 위험성 평가’ 과제의 일환으로 수행된 연구결과 중 일부로, 국내에 유입되어 정착화되었거나, 재배지로부터 일출되어 자연생태계로 확산 가능성이 높은 외래식 물의 현황을 파악하였고, 산림청 국립수목원을 비롯한 타부처 외래식물 목록과 관련 주요 도감 및 문헌들을 재검토하였다. 또한 이들을 원산지, 도입시기 및 정착 여부에 따라 체계화하였고, 침입외래식물로 분류되는 외래식물들은 국내 분포정보를 바탕으로 확산정도를 등급화 하였다. 그 결과 국내에 분포하는 외래식물은 96과 353속, 595종, 6아종, 11변종, 1품종, 6잡종의 총 619분류군으로 파악되었으며, 이 중 사전귀화식물 30 분류군, 잠재침입식물 214분류군이었고, 침입외래식물은 총 375분류군으로 5등급(widespread, WS)이 19분류 군, 4등급(serious spread, SS) 16분류군, 3등급(concerned spread, CS) 19분류군, 2등급(minor spread, MS) 37분 류군, 1등급(potential spread, PS) 284분류군으로 나타났다. 외래식물은 앞으로도 계속 유입될 것이고, 이들의 분포 또한 환경 및 기타요인에 의해 변하기 때문에 지속적인 현황파악이 수행되어야 한다.

An overlooked invasive alien plant of Jejudo Island: Commelina caroliniana (Commelinaceae)

강은수,이강협,손동찬 한국식물분류학회 2021 식물 분류학회지 Vol.51 No.1

Invasive alien species management is pivotal for biodiversity conservation. Commelina caroliniana Walter, from the family Commelinaceae, is an alien plant native to the Himalayas and India, but it has been widely introduced around the world, including in the United States, Brazil, Philippines, and Japan. In Korea, the first population was found growing adjacent to agricultural land and farm roads on Jejudo Island, and field observations confirmed the presence of at least nine populations there. It is similar morphologically to C. diffusa Burm. f. but can be distinguished by involucral bracts that are ciliate at the base, hairs on the peduncle and obsolete upper cincinnus, brown spots on its 4-lobed antherode, and seed surfaces that are smooth to slightly alveolate. It was determined to have an invasiveness low score of 8 according to the Korean ‘Invasive Alien Plant Risk Assessment’, suggesting that it may spread to natural habitats. Although the current distribution of C. caroliniana is restricted to Jeju-si, it has spread dramatically in many other areas of the world. At present, it has had a limited impact on the local environment, but local and regulatory authorities should pay close attention to this plant and take measures to prevent its expansion in the future.

A complete chloroplast genome of Epilobium parviflorum Schreb. (Onagroideae: Onagraceae)

강은수,정수영,이세령,손동찬,김상철 국립중앙과학관 2023 Journal of Asia-Pacific Biodiversity Vol.16 No.4

We determined the complete chloroplast genome sequence of Epilobium parviflorum Schreb. The genome is 161,284 bp in length [including a large single copy (LSC): 89,063 bp; a small single copy (SSC): 17,323 bp; and two inverted repeat (IR) regions: 27,499 bp] with 38.1% GC content and contains 84 coding genes (CDS), 37 transfer RNA genes, and 8 rRNA genes. Among them, infA was annotated as a pseudogene. The maximum-likelihood analysis based on CDS sequences of chloroplast genomes was conducted for investigating the phylogenetic relationship among Epilobium and related species. The results showed a close relationship between E. parviflorum and E. hirsutum L. Our study added new genetic information of E. parviflorum and helped to understand the relationship with related species and evolutionary history in Onagraceae.

Development of Anti-corrosion Coating Solution Using Surface Modified Nanodiamond for Steel Sheet

강은수,박상후,심상은 한국고분자학회 2011 한국고분자학회 학술대회 연구논문 초록집 Vol.2011 No.2