• Proceedings of the Plant Resources Society of Korea Conference
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• 2010.10a
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• pp.16-16
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• 2010

본 연구는 13과 37종 양치식물의 엽상체(지상부)와 근경의 메탄올 추출물을 대상으로 식품의 오염 및 변질의 원인이 되는 Bacillus subtils, 식중독의 원인이 되는 Escherichia coli, 식중독 및 선회병(listeriosis)의 원인이 되는 Listeria monocytogenes, 피부 여드름의 원인이 되는 Propionibacterium acnes에 대한 항균활성을 탐색하고 항균력이 우수한 천연소재를 선발하기 위하여 시행하였다. $5mg{\cdot}mL^{-1}$의 농도의 추출물을 대상으로 각 미생물에 대하여 50% 이상의 항균활성을 나타낸 양치식물 추출물을 선발하였으며, 선발된 추출물을 2mg/disc의 농도로 조절하여 agar diffusion법으로 항균력을 측정하여 15mm 이상의 억제환을 나타내는 추출물을 선발하였다. 상기의 방법으로 선발된 추출물을 $0.125{\sim}2.000mg{\cdot}mL^{-1}$의 농도로 조절하여 72시간 동안 각 미생육의 생육에 미치는 영향을 분석하여 항균활성이 우수한 양치식물의 추출물을 선발하였다. 연구의 결과, B. subtils의 생육억제에는 야산고비의 성엽과 쇠고비의 근경 추출물, E. coli의 생육 억제에는 설설고사리의 성엽과 나도히초미 및 더부살이고사리의 근경 추출물, L. monocytogenes의 생육억제에는 관중의 성엽과 공작고사리, 꿩고비 및 쇠고비의 추출물이 효과적이었다. 한편 대부분의 양치식물 추출물은 P. acnes의 생육억제 효과가 미비하였으나, 관중과 참지네고사리는 성엽과 근경 모두에서 P. acnes의 생육억제 효과가 매우 우수하였으며, 별도의 제균처리를 하지 않은 관중과 참지네고사리의 메탄올 조추출물의 $MIC_{50}$은 성엽의 추출물에서 66.8과 $80.4{\mu}g{\cdot}mL^{-1}$, 근경의 추출물에서는 8.8과 $54.2{\mu}g{\cdot}mL^{-1}$로 나타났다.

• Korean Journal of Plant Resources
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• v.25 no.4
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• pp.433-446
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• 2012

The preliminary study for providing the relationship of the factors which are climate and the pteridophyta was carried out. Dormancy form and leaf phenology of the 321 taxa belonging to 27 families were analyzed. This survey shows life-form spectrum of Korean ferns. The results obtained from this study were as follows: Deciduous (d), Evergreen (e) and Summer-deciduous (sd) were calculated as 37.4%, 59.2%, 1.9%, respectively and the Evergreen (e) has the highest value compared to the other leaf phenologies. It observed from the life-form spectra that Hemicryptophytes (H) was the most common dormancy form at 42.1%. Geophytes (G), Epiphytes (E) and Chamaephytes (Ch) were calculated at 25.5%, 15.9%, and 11.8%, respectively. There will be a discussion about geographical distribution of Korean ferns and possibility of their distribution range.

• Molecules and Cells
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• v.37 no.5
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• pp.372-382
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• 2014

In this study, the chloroplast (cp) genome sequences from three early diverged leptosporangiate ferns were completed and analyzed in order to understand the evolution of the genome of the fern lineages. The complete cp genome sequence of Osmunda cinnamomea (Osmundales) was 142,812 base pairs (bp). The cp genome structure was similar to that of eusporangiate ferns. The gene/intron losses that frequently occurred in the cp genome of leptosporangiate ferns were not found in the cp genome of O. cinnamomea. In addition, putative RNA editing sites in the cp genome were rare in O. cinnamomea, even though the sites were frequently predicted to be present in leptosporangiate ferns. The complete cp genome sequence of Diplopterygium glaucum (Gleicheniales) was 151,007 bp and has a 9.7 kb inversion between the trnL-CAA and trnV-GCA genes when compared to O. cinnamomea. Several repeated sequences were detected around the inversion break points. The complete cp genome sequence of Lygodium japonicum (Schizaeales) was 157,142 bp and a deletion of the rpoC1 intron was detected. This intron loss was shared by all of the studied species of the genus Lygodium. The GC contents and the effective numbers of codons (ENCs) in ferns varied significantly when compared to seed plants. The ENC values of the early diverged leptosporangiate ferns showed intermediate levels between eusporangiate and core leptosporangiate ferns. However, our phylogenetic tree based on all of the cp gene sequences clearly indicated that the cp genome similarity between O. cinnamomea (Osmundales) and eusporangiate ferns are symplesiomorphies, rather than synapomorphies. Therefore, our data is in agreement with the view that Osmundales is a distinct early diverged lineage in the leptosporangiate ferns.

• Journal of Microbiology and Biotechnology
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• v.23 no.1
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• pp.29-35
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• 2013

A Nodulisporium sp. (Hypoxylon sp.) has been isolated as an endophyte of Thelypteris angustifolia (Broadleaf Leaf Maiden Fern) in a rainforest region of Central America. It has been identified both on the basis of its morphological characteristics and by scanning electron microscopy as well as ITS sequence analysis. The endophyte produces volatile organic compounds (VOCs) that have both fuel (mycodiesel) and use for biological control of plant disease. When grown on potato dextrose agar, the organism uniquely produces a series of ketones, including acetone; 2-pentanone; 3-hexanone, 4-methyl; 3-hexanone, 2,4-dimethyl; 2-hexanone, 4-methyl, and 5-hepten, 2-one and these account for about 25% of the total VOCs. The most abundant identified VOC was 1,8 cineole, which is commonly detected in this group of organisms. Other prominent VOCs produced by this endophyte include 1-butanol, 2-methyl, and phenylethanol alcohol. Moreover, of interest was the presence of cyclohexane, propyl, which is a common ingredient of diesel fuel. Furthermore, the VOCs of this isolate of Nodulisporium sp. were selectively active against a number of plant pathogens, and upon a 24 h exposure caused death to Phytophthora palmivora, Rhizoctonia solani, and Sclerotinia sclerotiorum and 100% inhibition to Phytophthora cinnamomi with only slight to no inhibition of the other pathogens that were tested. From this work, it is becoming increasingly apparent that each isolate of this endophytic Nodulisporium spp., including the Daldina sp. and Hypoxylon spp. teleomorphs, seems to produce its own unique set of VOCs.

• FLOWER RESEARCH JOURNAL
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• v.17 no.2
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• pp.114-120
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• 2009

The most effective conditions of in vitro culture were studied for mass propagation of Pteris cretica 'Wilsonii'. Spores of the species germinated within 7 weeks. The greatest proliferation was obtained with Knop and Hyponex media, but growth was more effective in Hyponex medium. MS medium induced necrosis of prothalli in all strength of nitrogen and sucrose except in case of 0% sucrose. Hyponex medium supplemented with 1% sucrose and 0.6% agar promoted propagation and growth of prothalli. In Hyponex medium, optimal inoculation method was homogenization, but in MS medium dividing colonies of prothalli was more effective. Culturing on solid medium was more effective than liquid culture method. Liquid culture induced necrosis of prothalli. Shaking cultured prothalli showed good growth, but propagation was inhibited compared to those cultured on solid medium.

• Korean Journal of Plant Taxonomy
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• v.49 no.2
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• pp.127-139
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• 2019

The purported four hybrid origins of Asplenium in Korea were tested based on morphological, cytological and DNA sequence data. Asplenium castaneo-viride, A. ${\times}$ uiryeongse, A. ${\times}$ montanus, and A. ${\times}$ kitazawae share several morphological characteristics with the Asian walking fern A. ruprechtii and related taxa as parents and show a sympatric distribution with the putative parents, raising the possibility of hybrid origins: A. castaneo-viride (A. ruprechtii and A. incisum), A. ${\times}$ uiryeongse (A. ruprechtii and A. pekinense), A. ${\times}$ montanus (A. ruprechtii, A. trichomanes, and A. incisum), and A. ${\times}$ kitazawae (A. ruprechtii and A. sarelii). We investigated flow cytometry and chloroplast DNA sequence data (rbcL, rps4-trnS, and rps4-trnS intergenic spacer) to clarify the hybridization and origin of each hybrid. In the flow cytometry analyses, A. ruprechtii shows diploid (2x) only, whereas A. castaneo-viride (3x, 4x), A. ${\times}$ uiryeongse (3x), A. ${\times}$ montanus (3x, 4x), and A. ${\times}$ kitazawae (2x, 4x) exhibit polyploidy, suggesting hybrid events along speciation. The rbcL and rps4-trnS and rps4-trnS intergenic spacer data suggest that A. ruprechtii is one the maternal ancestors of all four hybrids. In addition, the rps4-trnS and rps4-trnS intergenic spacer data indicate that A. incisum is also the maternal ancestor of A. ${\times}$ kitazawae and A. ${\times}$ montanus, proposing multiple hybridization events for these two hybrids. In A. ${\times}$ montanus, morphological features such as the leaf forms and sympatric distributions of the species also support the multimaternal hypothesis, but the morphological features of A. ${\times}$ kitazawae must be examined with consideration of hybrid events. To clarify the complex hybrid evolutionary lineages of the four Asplenium hybrids, further research with taxon sampling and molecular markers should be conducted.

• Korean Journal of Plant Resources
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• v.32 no.5
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• pp.559-564
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• 2019

Cyrtomium yamamotoi Tagawa is an unrecorded species of perennial Pteridophyta that belongs to the genus Cyrtomium of Dryopteriaceae. It is known as native to Taiwan, China and Japan, but we found it in Jeju-si, Jeju-do and Haenam-gun, Jeollanam-do, Republic of Korea in 2018. This species is very similar to C. fortunei J.Sm. having characters such as 1 pinnate compound leaves, globular indusium, but distinguished from the latter by its lanceolate or lanceolate-ovate shaped lateral pinnates of less than 12 pairs, bicolor indusium with dark brown or blackish in center, and margin incised teeth. Here, we provide its description, photographs and a key of related taxa in Korea.

• Safety and Health at Work
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• v.15 no.2
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• pp.129-138
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• 2024

The COVID-19 pandemic has led to a significant surge in glove usage, as recommended by the World Health Organization. Despite efforts to ensure the quality and safety of gloves, glove-associated skin diseases such as hand dermatitis have become ubiquitous, particularly among health care workers. This review discusses the prevalence, causes, and risk factors of hand dermatitis, as well as research efforts in medical gloves in the past decade to overcome glove-related hand dermatitis. Research papers from 2013 to 2022 were reviewed, selecting only 49 relevant papers from the Ovid, PubMed, and Scopus databases. The average prevalence of hand dermatitis among health care workers increased from 21.08% to 37.24% upon the impact of the COVID-19 pandemic. The cases are likely due to allergies to latex proteins, rubber additives, and accelerators commonly found in gloves. Using alternatives to latex gloves, such as accelerator-free and latex-free glove options, can help reduce allergy-induced hand dermatitis. Strict hand hygiene practices, such as frequent hand washing and the use of sanitizers, are also contributing factors in contracting hand dermatitis. Over the past decade, glove research advancements have focused mainly on reducing or immobilizing latex proteins. These include the use of biodegradable dialdehyde, sodium alginate, arctigenin, bromelain, papain, UV-LED, prototype photoreactors, and structure-modified nanosilica with silane A174. Two effective hand dermatitis preventive measures, i.e. an additional layer of glove liners and the use of gentle alcohol-based hand sanitizer, were recommended. These advancements represent promising steps towards mitigating hand dermatitis risks associated with glove usage.

• Journal of Korean Society of Forest Science
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• v.85 no.2
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• pp.329-339
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• 1996

This study is to investigate the effect of mycorrhizal development, growth, nutrient absorption of P. thunbergii seedlings inoculated with Pisolithus tinctorius(Pt. KJ-1) in relation to toxic materials in soil. The concentrations on copper solution applied to the soils were 0, 40, 120, 260, 430ppm. The results are summarized as follows : 1. The germination of P. thunbergii with Pt. increased greater than without ectomycorrhizal fungi. Mycorrhizal development showed a significant decreasing trend at high concentration, and tolerant Cu test with Pt. in agar plate media showed a decreasing trend at a high level. 2. P. thunbergii seedlings inoculated with Pt. showed that the shoot length was significantly promoted at 40, 120ppm copper levels, and that of noninoculated seedlings had the lowest effect in 430ppm copper level. 3. The outer shape of ectomycorrhizal root tips after inoculating Pt. on P. thunbergii seedlings appeared as a monopodial type, a fern-like type, and a cluster-like type at 0ppm, 40ppm levels, but only monopodial type came out at 260ppm, 430ppm copper levels. 4. Root length, no. of juvenile leaves, total length of juvenile leaves, total dry weight, no. of needles and total length of needles of P. thunbergii with Pt. increased greater than those of noninoculated seedling. Growth response of P. thunbergii seedling inoculated with Pt. increased significantly at 40ppm, 120ppm Cu levels. 5. As a result of analysis of growth medium, pH, Na, CEC increased at higher Cu level, and total nitrogen, organic matters, available phosphorous, K, Ca and Mg decreased at 40ppm, 120ppm Cu levels. As a result of an analysis about a copper within soils, it appeared having high Cu-concentration at 0ppm level of an inoculated Pt. and high Cu-concentration in noninoculated Pt. than in inoculated Pt. at higher level. 6. As a result of an analysis of shoot, N, P, and K-concentration were higher in noninoculated seedlings than in inoculated seedlings, and Cu-concentration was higher in inoculated seedlings than in noninoculated seedlings. The analysis of root resulted in a high N-concentration at 40ppm, 120ppm levels, in a high P-concentration in inoculated seedlings and in a high Cu-concentration in noninoculated seedlings. Cu-concentration was significantly higher at root than at shoot.

• Korean Journal of Soil Science and Fertilizer
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• v.19 no.2
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• pp.153-156
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• 1986

A pot (1/200a) experiment was conducted to find out the changes of soil and water temperature on the several paddy soil weeds (Duck weed, Algae and Floatin fern) growing condition. The results obtained were shown as follows; 1. Diurnal maximum soil and water temperature were lowered by 2 to $3^{\circ}C$ under duck weed growing condition while minimum soil and water temperature were higher in $0.5^{\circ}C$ and/or similar tendency than that of bare paddy soil condition. 2. The changes of soil and water temperature were lowered by 0.1 to $0.3^{\circ}C$ at sunny day under Duck weed growing condition but was higher in 0.1 ta $0.4^{\circ}C$ at rainy, cloudy and after rainy day than that of bare paddy soil. 3. Soil and water temperature were higher about 0.3 to $1.0^{\circ}C$ under algae growing condition than that of bare paddy condition. 4. The effects of keeping warm efficiency were high in order of Duck weed > Duck weed with algae > algae > bare paddy soil condition.