수목 정유의 생리활성화에 관한 연구(1) : 침엽수 잎 정유의 항균활성 Antimicrobial Activity of Essential Oils from Coniferous Needles

이성숙,강하영,최인규 한국목재공학회 2002 목재공학 Vol.30 No.1

대표적인 침엽수인 소나무, 잣나무, 편백, 화백의 잎 정유를 사용하여 수목 정유의 항균활성에 관하여 조사하였다. 항진균활성은 배지점적법을 이용하여 목재부후균인 Gliocladium virens, Tyromyces palustris, Trametes versicolor를, 비부후성 열화균인 Rhizopus stolonifer를, 수목병원균인 Phomopsis albobestita, Endothia nitschkeii, Melanconis juglandis에 대하여, 그리고 항세균활성은 paper disc법과 탁도측정법을 이용하여 그람양성균인 Staphylococcus aureus, Streptococcus faecalis, Bacillus subtilis 및 그람음성균인 Escherichia coli에 대하여 검정하였다. 그 결과 항진균활성은 편백이 가장 우수한 것으로 나타났으며 그 다음이 소나무와 잣나무로 목재부후균에 대해서는 소나무가 잣나무보다 높은 활성을, 수목병원균에 대해서는 잣나무가 소나무보다 높은 활성을 나타내었다. 그리고 화백 잎 정유가 가장 활성이 낮은 것으로 나타났다. 또한, 항세균활성은 항진균활성과 달리 소나무 잎 정유가 편백보다 높은 활성을 보였으며 그 다음이 잣나무 그리고 화백의 순이었다. 이러한 정유에 따른 항균 스펙트럼의 차이는 각 정유의 성분 변이와 이러한 성분들의 미생물에 대한 작용특이성에 기인하는 것으로 사료되었다. The essential oils were extracted from the needles of several softwood tree species, Pinus densiflora, Pinus koraiensis, Chamaecyparis obtusa and Chamaecyparis pisifera to investigate their biological activities. The antifungal activity by hyphal growth inhibition method was determined by three wood rot fungi, one mouldous fungi, and three tree pathogenic fungi and the antibacterial activity by paper disc method and turbidiometric method by three gram positive bacteria and one gram negative bacteria, Escherichia coli, were also tested. Antifungal activity was the best in the essential oil from C. obtusa, and the following was resulted in order of P. densiflora and P. koraiensis. The essential oil from P.densiflora showed higher antifungal activity against wood rot fungi than that from P. koraiensis, while the result was contrary against tree pathogenic fungi. However, the antibacterial activity was the best in the essential oil from P. densiflora, and the following was in order of C. obtusa and P. koraiensis. From these results, the variation of biological activity seemed to be due to the chemical composition of essential oils.

지지막을 이용하는 액막 추출기 내에서 아연 이온의 이동

주창식,이석희,이민규,홍성수,하홍두,정석기 한국환경과학회 2000 한국환경과학회지 Vol.9 No.2

For the purpose of development of a liquid membrane permeator which separates metal ions from aqueous solutions continuously and effectively, a continuous membrane permeator with the membrane solution trapped between extraction and stripping phases by two micro-porous hydrophilic films was manufactured. Experimental researches on the separation of zinc ion from aqueous solutions were performed in the liquid membrane permeator with 30 vol % D_2EHPA solution in kerosine as liquid membrane. As results, the liquid membrane permeator separates zinc ion from aqueous solutions continuously and effectively in the wide range of operating conditions. A simple mass transfer rate model using equilibrium constant of the extraction reaction for the system used were proposed, and the model was compared with experimental results of separation of zinc ion in the permeator. And the effects of operating factors, such as space time, pH of extraction solution, extraction temperature, on the separation rate of zinc ion in the permeator were experimentally examined.

A Valid Indication and the Effect of Bilateral Inferior Oblique Transposition on Recurrent or Consecutive Horizontal Deviation in Infantile Strabismus

Suk-Gyu Ha,Gun-Hoo Na,Seung-Hyun Kim 대한안과학회 2017 Korean Journal of Ophthalmology Vol.31 No.2

Purpose: To evaluate the effects of bilateral inferior oblique transposition (BIOT) on horizontal deviation from primary position among patients with bilateral dissociated vertical deviation (DVD) associated with inferior oblique overaction (IOOA) in infantile strabismus. Methods: Retrospective chart review was conducted among 19 patients with infantile strabismus. All patients had DVD and IOOA with consecutive or recurrent horizontal deviation and underwent modified BIOT surgery. Patients were divided into three subgroups: patients who underwent BIOT (BIOT group, n = 9) alone, BIOT with medial rectus recession or lateral rectus resection simultaneously (ET BIOT group, n = 6), or BIOT with lateral rectus recession or medial rectus resection simultaneously (XT BIOT group, n = 4). Postoperative angle of horizontal deviation (prism diopter, PD) and corrected magnitude of horizontal deviation (PD) at final visit after surgery were analyzed in each group. Results: The mean age was 55.11 ± 21.05 months (range, 32 to 115). The mean follow-up period was 8.68 ± 2.87 months (range, 6 to 18). Preoperative horizontal deviation was 4.23 ± 5.99 PD (range, 0 to 16) in BIOT, –17.33 ± 6.76 PD (range, –30 to –10) in ET BIOT, and 17.50 ± 2.52 PD (range, 14 to 20) in XT BIOT. Esodeviation is represented by negative values. DVD and IOOA were reduced less than +1 in all patients. The corrected amount of horizontal deviation was 3.56 ± 5.18 PD (range, 0 to 16) in BIOT surgery alone and larger in XT BIOT (18.50 ± 3.41 PD) than in ET BIOT (12.33 ± 5.57 PD, p = 0.004). Conclusions: Minimal exodeviation was corrected by BIOT alone. In addition, secondary eso- or exodeviation at great magnitudes should be corrected with proper horizontal muscle surgery along with BIOT.

Clinical Impact of Smartphone with Iris Recognition Scanner on Visual Function in Normal Adults

Suk-Gyu Ha,Young-Woo Suh,Seung-Hyun Kim 대한검안학회 2019 Annals of optometry and contact lens Vol.18 No.2

Purpose: Smartphone with iris recognition scanner uses using infrared-A wave. The aim of this study was to investigate the impacts of smartphone with iris recognition scanner on the visual function of normal adults. Methods: Normal, healthy volunteers were divided into 2 groups according to the type of smartphone used: the photo camera and iris recognition scanner groups. Ocular changes were measured before and immediately after ocular exposure (both eyes) for 10 seconds. Ocular examinations, including measurement of visual acuity (logarithm of minimal angle of resolution), refractive error (diopters), grading of the corneal stain score (0 to 5), ocular surface temperature (℃), and pupil diameter (mm) were performed. Results: A total of 60 volunteers were enrolled in the study. Thirty volunteers each were included in the photo camera and iris recognition scanner groups. The mean age were 38.5 ± 9.3 years and 37.6 ± 6.8 years, respectively. There were no significant changes in the ocular measurements immediately after exposure to the photo camera and iris recognition scanner (p > 0.05 for all). Conclusions: There were no clinically significant effects on normal adult eyes after exposure to smartphone with iris recognition scanner.

The Prevalence of Hyperopia in Korean Children: The Korea National Health and Nutrition Examination Survey 2008-2011

Suk-Gyu Ha,Seung-Hee Baek,Key-Hwan Lim,Seung-Hyun Kim 대한검안학회 2016 Annals of optometry and contact lens Vol.15 No.3

Purpose: This study sought to estimate the prevalence of hyperopia in Korean school children aged 5-18 years. Methods: The 2008-2011 Korea National Health and Nutrition Examination Survey (KNHNES) used an autorefraction test without cycloplegia to obtain refractive data on the population between 5 and 18 years of age. Using data from the right eye with a spherical equivalent (SE) value. Hyperopia was defined over than +1 diopter (D) of SE. We classified subjects as having mild hyperopia (+1.00 D < SE ≤ +3.00 D), moderate hyperopia (+3.00 D < SE ≤ +5.00 D), or severe hyperopia (SE > +5.00 D). Age, gender, region and horizontal strabismus-specific rates for each type of hyperopia were compared to subjects without hyperopia. Results: Of the 6084 participating children who completed the KNHNES, hyperopia was observed in 2.2% (n=134) of the children. The prevalence of mild (mean, SE: 1.74 ± 0.52 D, range: 1.06-3.00), moderate (mean, SE: 3.84 ± 0.62 D, range: 3.25-5.00), and severe hyperopia (mean, SE: 5.90 ± 0.63 D, range: 5.50-7.00) was 1.9, 0.2, and 0.1%, respectively. Mild hyperopia was more prevalent in girls of preschool age (5-7 years; p=0.02). Esodeviation was also present in 8.2% of the hyperopic population. However, no differences were found with regard to age or region in the hyperopic population. Conclusions: The prevalence of hyperopia was only 2.2% in the children of the study population. Thus, hyperopia is a relatively rare refractive error in Korea.

난독증과 얼렌증후군

하석규(Suk-Gyu Ha),김승현(Seung-Hyun Kim) 대한검안학회 2015 Annals of optometry and contact lens Vol.14 No.4

Meares-Irlen syndrome (MIS) is characterized by symptoms of eye strain, headache and visual perceptual distortions during viewing text. The symptoms of MIS and visual stress are non-specific and the condition needs to be differentially diagnosed from other ocular conditions, such as refractive error, binocular abnormality and accommodative problems. Deficit of magnocellular system and cortical excitation have been suggested as causes of MIS. MIS and primary dyslexia are separate entities and are treated in different ways. The symptoms are alleviated with individually prescribed colored tinted lens, such as MISViS filters. However, there is a controversy of presence of MIS, further long-term studies are needed to investigate pathophysiology of MIS and prove effectiveness of tinted lens on MIS.

Transcriptomic variation in proanthocyanidin biosynthesis pathway genes in soybean (<i>Glycine</i> spp.)

Ha, Jungmin,Kim, Myoyeon,Kim, Moon Young,Lee, Taeyoung,Yoon, Min Young,Lee, Jayern,Lee, Yeong‐,Ho,Kang, Young‐,Gyu,Park, Jun Seong,Lee, John Hwan,Lee, Suk‐,Ha John Wiley & Sons 2018 Journal of the Science of Food and Agriculture Vol.98 No.6

<P>CONCLUSIONWe detected major differences in the transcriptional levels of genes involved in the biosynthesis of proanthocyanidin and anthocyanin among genotypes beginning at the early stage of seed development. The results of the present study provide insights into the underlying genetic variation in proanthocyanidin biosynthesis among soybean genotypes. (c) 2017 Society of Chemical Industry</P>

Numerical analysis of effects of fenestration in type B aortic dissection

Gyu-Han Lee(이규한),Woon Heo(허운),Jongmin Seo(서종민),Suk-Won Song(송석원),Hojin Ha(하호진) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.5

Changes of Chemical Properties in Upland Soils in Korea

Myung-Suk Kong,Seong-Soo Kang,Mi-Jin Chae,Ha-il Jung,Yeon-Gyu Sonn,Deog-Bae Lee,Yoo-Hak Kim 한국토양비료학회 2015 한국토양비료학회지 Vol.48 No.6

Soil testing is one of the major strategies for establishing sustainable agricultural practice as it analyzes nutrient contents of soil and determines the amount of nutrients required for crop growth. Soil testing for the field cultivating regional major crops in Korea has been conducting by National Academy of Agricultural Science (NAAS), provincial agricultural research & extension services and agriculture technology centers since 2000. 1,006,227 soil samples were analyzed and uploaded on Korean soil information system (http://soil.rda.go.kr) from 2003 to 2013. Soil pH has changed from 6.1 to 6.2. Organic matter (OM), available (Avail.) phosphate and exchangeable (Exch.) K have decreased from 24 to 23 g kg<SUP>-1</SUP>, 541 to 399 mg kg<SUP>-1</SUP> and 0.90 to 0.72 cmolc kg<SUP>-1</SUP> between 2003 and 2013, respectively. Especially, Exch. Ca contents decreased to 5.7 cmolc kg<SUP>-1</SUP> in 2009 and increased to 6.2 cmolc kg<SUP>-1</SUP> in 2013. Ratios of optimal ranges for cropping were 48% for pH, 22% for OM, 26% for Avail. phosphate, and 23, 16, 22% for Exch. K, Ca and Mg in 2013. Ratios of optimal ranges for pH increased and low ranges for OM, Avail. phosphate and Exch. K increased. Frequency distribution was 64% for pH 5.5~7.0, 65% for OM 10~30 g kg<SUP>-1</SUP>, 48% for Avail. phosphate under 300 mg kg<SUP>-1</SUP> and 23, 29, 22% for Exch. K 0.2~0.6, Ca 4.0~6.0 and Mg 1.0~1.5 cmolc kg<SUP>-1</SUP>.

딸기의 고설수경재배에서 백납과 발생에 미치는 규소의 영향

전하준(Ha Joon Jun),황진규(Jin Gyu Hwang),손미자(Mi Ja Son),최문환(Moon Hwan Choi),윤혜숙(Hae Suk Yoon) (사)한국생물환경조절학회 2006 생물환경조절학회지 Vol.15 No.4

딸기의 백납과를 유발하는 것으로 추정되는 몇 가지 요인 중에서 규소가 백납과의 발생에 미치는 영향을 검토하였다. 배양액 내에 규소를 첨가하면 약 l개월 후부터 백납과가 발생 하였는데 potassium silicate (K₂SiO₄)의 200㎖ㆍℓ?¹ 처리에서는 최고 90%이상의 백납과 발생율을 나타내었다. 배양액에 규소를 제거하면 약 7~8주 후에 백납과의 발생이 중단되었으나 potassium silicate(K₂SiO₄)의 200㎖ㆍℓ?¹ 처리에서 가장 늦게까지 발생이 지속되었다. 과실의 길이는 대조구에 비해 규소 처리구에서 약간 길었으며, 과경과 과중은 고농도의 규소 처리구에서 감소하는 경향을 나타내었다. 과실내의 가용성 고형물과 과실수, 주당 수확량은 처리 간에 차이가 없었다. 백납과의 발생비율은 규소의 농도가 높을수록 현저하게 증가하였다. 본 실험의 결과에서 왕겨배지를 사용하는 수경재배의 백납과 발생은 왕겨에서 유출된 규소의 영향인 것으로 밝혀졌다. 이 결과는 수경재배농가의 백납과 발생 방지에 유효한 정보로 이용될 수 있을 것이다. This experiment has investigated the effects of silicon on albinism of strawberry. Albino fruit appeared after a month of treatment of potasium silicate(Si) in nutrient solution. When 200 ㎖ㆍℓ?¹ of Si applied, number of albino fruit increased over 90% of total amount of fruit, and the symptom remained lat-est any other treatment. The fruit length of the strawberries in Si treatments were longer than control treatment. However, the diameter and weight of fruit decreased in treatment of Si. The soluble solids of fruits, numbers of fruit and yield per plant were no significant differences among treatments. The rate of albino fruit was significantly increased with increase of concentration of Si. The results of this experiment will be utilized for the cultivation in the new substrate application for strawberry hydroponics.