• 수산해양기술연구
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• 제52권1호
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• pp.42-47
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• 2016

This study was conducted to investigate visual threshold of nigro (Cichlasoma nigrofasciatum) on white LED light. The visual threshold was obtained by analyzing electrocardiogram (ECG) of the nigro. 5 individuals (body weight: 15.62~45.49 g; TL: 8.9~12.4 cm) were trained for lights by an electric stimulus. And then the heart rate (beats/10s) before and after switching on the light were compared. Light intensity range was from 0.00 to 226.4 lux. Average heart rate was 10.36 beats/10s in the normal condition. When the fish perceived the light, the heart rate was decreased. Visual threshold of the fish was 2.59 lux.

• 한국어업기술학회:학술대회논문집
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• 한국어업기술학회 2003년도 춘계 수산관련학회 공동학술대회발표요지집
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• pp.397-399
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• 2003

전세계적으로 연안환경에서의 중금속 오염을 모니터링 하는 데에는 Mussel Watch Program을 중심으로 담치류(mussel)와 굴(oyster) 등이 지표종(indicator species)으로 널리 사용되어 왔다(O'Conner et al.,1994). 그러나 남극에는 이 두종이 서식하고 있지 않으며, 현재까지 연구에 따르면 남극큰띠조개와 남극가리비(Adamussium cozbecki)가 담치류에 상응하는 유용한 생물지표종으로 사용될 수 있다고 알려져 있다(안 등, 1996, 2001 ; SCAR, 1996 ; Nigro et al., 1992). (중략)

• E2M - 전기 전자와 첨단 소재
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• 제16권9호
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• pp.65.2-65
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• 2003

Praseodymium oxid ($Pr_2$$O_3$) thin films have been deposited on Si(100) substrates by metalorganic chemical vapor deposition using praseodymium tris-2,2,6,6-tetramethyl-3,5-heptandionate as source material. Film structural, morphological, and compositional characterizations have been carried out. Dielectric properties have been studied as well by capacitance-voltage and current-voltage measurements on metal-oxide-semiconductor capacitors of several areas. The $Pr_2$$O_3$ films have shown a dielectric constant = 23-25 and a leakage current density of $8.8{\times}10$-e $A/\textrm{mm}^2$ at ＋1 V.

• 생명과학회지
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• 제26권10호
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• pp.1202-1206
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• 2016

Subsection I과 II의 시아노박테리아 균주들은 단세포성이며, Subsection III의 시아노박테리아 균주들은 섬유상의 다계통성, 이형 사이토시스 형성성 균주들인 반면, Subsections IV와 V는 단일계통성으로 보고되어있다. 본 연구에서 13 균주의 시아노박테리아의 the small subunit rRNA (16S rRNA) 염기서열들이 - Subsection III의 Oscillatoria nigro-viridis PCC7112, Subsection IV에 속하는 Anabaena, Nostoc, Tolypothrix, Calothrix 및 Scytonema속을 포함한 6 균주, Subsection V에 속하는 Hapalosiphon, Fischerella and Chlorogloeopsis 속의 6 균주 - 결정되었다. 결정된 16S rRNA 염기서열을 이용하여 시아노박테리아의 분자계통분석을 수행하였다. 그러나, 16S rRNA의 염기서열 결정을 근거로 한 본 연구의 계통분석결과 Subsection IV는 단일 계통성이 아닌 다계통성이며, 반면 Subsection V는 이전에 보고되어진 것처럼 단일 계통성임을 나타내었다. 또한, 본 연구 결과는 Scytonema속이 이형 사이토시스 형성성 시아노박테리아인 Subsection IV 및 V의 공통 조상일 수 있음을 강력하게 나타낸다. 부가적으로, 본 연구의 분자계통 분석을 통해 Anabaena속은 다계통성으로 계통학적으로 다양한 종들로 구성되어 있음을 나타내고 있다. 본 연구 결과는 Anabaena속이 좀 더 세밀하게 재분류 되어져야 함을 나타낸다.

• Parasites, Hosts and Diseases
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• 제48권2호
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• pp.167-169
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• 2010

We report a case of Hymenolepis diminuta infection in a 2-year-old child living in a suburban area of Catania, Italy. This case was initially referred to us as Dipylidium caninum infection, which was not cured after being treated twice with mebendazole. However, by analyzing the clinical presentation and stool samples we arrived to the diagnosis of H. diminuta infection. The case presented with atypical allergic manifestations which had never been reported as clinical features of symptomatic H. diminuta infection; remittent fever with abdominal pain, diffuse cutaneous itching, transient thoracic rash, and arthromyalgias. The patient was treated with a 7-day cycle of oral niclosamide, which proved to be safe and effective. This case report emphasizes that a correct parasitological diagnosis requires adequate district laboratories and trained personnel. In addition, we recommend the importance of reporting all H. diminuta infection cases, in order to improve knowledge on epidemiology, clinical presentation, and treatment protocols.

• Journal of Plant Biotechnology
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• 제3권3호
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• pp.135-140
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• 2001

An Agrobacterium tumefaciens LBA4404 (harboring antisense OMT gene)-mediated transformation method has been developed for poplar (P.nigra x maximowiczii) using prolonging co-cultivation time. Explants on LT (longterm) were induced transgenic calli one month earlier than those from ST (short-term) co-cultivation and remained healthier on LT than ST. With this approach, LT method reduced time to produce transgenic calli. Shoots were successfully regenerated from transgenic calli on SIM (Shoot Induction Medium) and rooted well on the basal medium spontaneously. The presence of antisense OMT gene was verified both by PCR and Southern analysis. Each transgenic poplar was phenotypically indishtinguishable when compared with controls for their growth pattern, leaf morphologies and xylem coloration.

• 한국조경학회지
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• 제28권5호
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• pp.93-103
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• 2000

This research is to propose a rational criterion of the selection and the management f the roadside trees, and to establish the planting design and system with the objective of improving the roadside environment. All of the roadside trees in each objective courses in Kangnung, and the soil disposition, hardness of the soil in the planting areas have been investigated. Also, we have surveyed the kinds of the trees which kandgnung inhabitants want. The conclusion is as follows Most of roadsides have trees, but they need the introduction of shrubs or ground covering plants according to the locations and the environmental conditions. We have selected nineteen species in regard to the roadside tree criterion and the growing conditions living in Kangnung. It is desirable that we make banding style planting space between each roadside tree to improve the low ratio of green coverage. We have found out that Ligustrum obtusifolium, Buxus micropnylla, Euonymus japonica, Rhododendron schlippenbachii, Phyllostachys nigro and Rosa rugosa, ect. are suitable. In order to soften and weaken the rigidity of the hard substances on a paved roadside, the climbers such as the perennial herbaceous flowering and hedera rhombea should be preferred rather than annual herbaceous flowering because of curtailment of expenditure. To posses a systematical greenery frame in kangnung, we have planned a planting design system that would expand the greenery space every year. Moreover, we have to make a plan to overcome space restrictions. We have established a flexible plan considering the roadside conditions and the improved standard planting methods with an ultimate aim to create a special roadside view.

• Animal cells and systems
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• 제4권1호
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• pp.31-37
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• 2000

The genetic variations among six species of Rana from Korea (R. nigro-maculata, R. piancyi, R. dybowskii, R. sp, R. rugosa type A, B and R. amurensis) were investigated using 499 bases of mitochondrial DNA sequences for ND2 (NADH dehydrogenase subunit 2) gene and $tRNA^{Trp}$ gene. Partial sequences of ND2 gene (427 bp) and full sequences of $tRNA^{Trp}$ gene (73 bp) were identified. The level of sequence divergences ranged from 0.2 to 5.2% within species and 4.9-28.0% among 6 species of the genus Rana. The $tRNA^{Trp}$ gene of the genus Rana was composed of 77 nucleotides which showed a two dimensional "cloverleaf" structure. The secondary structure of $tRNA^{Trp}$ was not found compensatory changes which could potentially confound phylogenetic inference. In the neighborjoining tree, brown frogs were clustered first with the level of sequence divergence of 13.20% between R. amurensis and R. dybowskii, and 9% between R. dybowskii and R. sp. supported by 99% bootstrap iterations, respectively. R. nigromaculata and R. plancyi were clustered into another group with 5.1% divergence supported by 100% bootstrap iteration. R. rugosa A 8nd B types were grouped by 4.9% divergence and clustered into the last group with other two groups with 100% bootstrap iterations.

• Nuclear Engineering and Technology
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• 제55권5호
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• pp.1911-1923
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• 2023

The nuclear safety assessment involving large transient simulations is forcing the community to develop methods for coupling thermal-hydraulics and neutronic codes and three-dimensional (3D) Computational Fluid Dynamics (CFD) codes. In this paper a set of dynamic boundary conditions are implemented in OpenFOAM^Ⓡ in order to apply zero-dimensional (0D) approaches coupling with 3D thermal-hydraulic simulation in a single framework. This boundary conditions are applied to model pipelines, tanks, pumps, and heat exchangers. On a first stage, four tests are perform in order to assess the implementations. The results are compared with experimental data, full 3D CFD, and system code simulations, finding a general good agreement. The semi-implicit implementation nature of these boundary conditions has shown robustness and accuracy for large time steps. Finally, an application case, consisting of a simplified open pool with a cooling external circuit is solved to remark the capability of the tool to simulate thermal hydraulic systems commonly found in nuclear installations.

• 한국산림과학회지
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• 제10권1호
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• pp.5-6
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• 1970

한라산에 자라는 구상나무는 4개의 품종으로 구성되었다. 이 중에서 푸른 구상나무와 붉은 구상나무는 학계에 새로 보고하는 것이기에 그의 원기재(原記載)와 더불어 발표한다. 검 구상나무는 지리산에서 발견된바 있으나 한라산에서는 이번이 처음이다. 목련나무의 대목(大木)도 여기에서 처음발견 되었다.