• 한국자원식물학회지
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• 제34권6호
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• pp.616-632
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• 2021

We performed taxonomic reviews and habitat circumstances survey for 41 un-introduced environmentally harmful plants (as designated by the Ministry of Environment, Korea in 2016). And we investigated plant specimens from several herbaria and performed a field survey in the southeastern region of the United States. Based on the result, we presented the most comprehensive results of weed risk evaluation and taxonomic description up to now as well as classification keys for 11 species to apply the regulation management of putative invasive alien species - Senecio madagascariensis Poir., Sphagneticola trilobata (L.) Pruski, Ageratina riparia (Regel) R.M. King & H. Rob. (Asteraceae), Andropogon gayanus Kunth (Poaceae), Echinocystis lobata (Michx.) Torr. & A. Gray (Cucurbitaceae), Salvinia minima Baker (Salviniaceae), Vincetoxicum rossicum (Kleopow) Barbar. (Asclepiadaceae), Asparagus asparagoides (L.) Druce (Asparagaceae), Alternanthera pungens Kunth (Amaranthaceae), Salpichroa origanifolia (Lam.) Thell., and Lycium ferocissimum Miers (Solanaceae).

• The Korean Journal of Physiology
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• 제2권2호
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• pp.45-52
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• 1968

Maximal oxygen uptake was measured in twenty-eight middle-aged men aged 45.0 (range: 40.3-50.7) years and fourteen middle-aged women aged 40.5 (range: 34.3-47.5) years by means of a treadmill test. The physique of subjects were:mean skinfold thickness at 4 sites, namely, back, arm, waist and abdomen was 7.59 mm in men and 14.5 mm in women; total body fat estimated from the mean skinfold thickness, 11.9% fat in men and 25.5% fat in women. The detailed observations are as follows: 1. Maximal oxygen uptake expressed on any reference unit in men was greater than that of women. The values of men to women were: 2.61 to 1.92l/min., 45.1 to 37.0 ml/min./kg, 51.8 to 46.5 ml/min./kg lean body mass (LBM), 15.7 to 12.6 ml/min./cm body height. 2. Maximal pulmonary ventilation in men was 80.2 l/min. and 63.5 l/min. in women. 3. There was a correlation of fairly high degree between maximal oxygen uptake and body weight, namely, r=0.56 in men and r=0.79 in women. The correlation between maximal oxygen uptake and lean body mass also was fairly high, namely, r=0.58 in men and r=0.69 in women. 4. The correlation between maximal pulmonary ventilation and body weight or lean body mass was r=0.51 and r=0.25 in middle-aged men and r=0.41 and r=0.19 in middle-aged women, respectively. 5. Maximal heart rate in men was 176.4 beat/min. and it was 183.9 beat/min. in women. 6. Maximal oxygen pulse in men was 14.6 ml/beat and 9.5 ml/beat in women. 7. Aerobic work capacity of korean middle-aged men and women maintained the same level as that of young men and women, respectively, as shown by maximal oxygen uptake expressed ml/min./kg or ml/min./kg lean body mass.

• 성인간호학회지
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• 제28권2호
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• pp.202-212
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• 2016

Purpose: The purpose of this study was to assess the relationship between cognitive function impairment and quality of life (QoL) among patients with breast cancer. Specifically, the intention was to verify the mediating effects for promoting behaviors leading to better health and QoL. Methods: A purposive sample of 152 patients undergoing chemotherapy was recruited. A cross-sectional survey design was used. Data were collected using four instruments: Everyday Cognition Scale, Korean Mini-Mental State Examination, Functional Assessment of Cancer Therapy-Breast Cancer Version 4, and Health Promoting Lifestyle Profile. Results: The mean score for subjective cognitive decline was 65.84; the health promotion behavior was 95.89, and 83.34 for QoL. Health promotion behavior was directly affected by cognitive decline ($R^2=6.0%$) as was QoL ($R^2=43%$). Subjective cognitive decline (${\beta}=-.57$ p<.001) and health promotion behavior (${\beta}=.37$, p<.001) were seen as predicting factors in QoL and explained 56% ($R^2=56%$). Health promotion behavior had a partial mediating effect in the relationship between self-reported cognitive decline and QoL (Sobel test: Z=-3.37, p<.001). Conclusion: Based on the findings of this study, nursing intervention programs focusing on managing cognitive decline and promoting health promotion behavior are highly recommended to improve QoL in cancer patients.

• 한국유체기계학회 논문집
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• 제7권2호
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• pp.14-20
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• 2004

In this study, the overall performance and the local flow field of the centrifugal compressor with the refrigerant HFC-l34a were numerically studied using CFX-TASCflow. The thermodynamic and transport properties of the refrigerant gas were modeled by REFPROP which is NIST refrigerant properties database. The impacts of a grid qualify, discretization scheme, turbulent model and interaction between a impeller and a cascade diffuser were analyzed comparatively. The results were compared with experimental data and 1-D design results using COMPAL and agreed well with others. The numerical method and data obtained in this study can be applied to the design and modification of centrifugal compressors with real gases

• 식물분류학회지
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• 제34권4호
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• pp.335-358
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• 2004

미나리아재비속(Ranunculus)의 털개구리미나리(R. cantonienesis)의 분자계통학적 유연관계를 조사하고 잡종화 가설을 추정하기 위하여, 군외군을 포함한 8분류군의 25개 DNA재료를 대상으로 핵 DNA와 엽록체 DNA의 염기서열을 분석하였다. 털개구리미나리와 근연종에 대하여 maximum parsimony와 maximum likelihood방법으로 분석한 핵 DNA의 ITS 계통수와 psbA-trnH, rps16, trnL 유전자 구간의 염기서열을 조합한 엽록체 DNA 계통수에서, 털개구리미나리는 젓가락나물과 가장 가깝고, 개구리미나리, 왜젓가락나물 순으로 유연관계를 나타내었다. 이러한 분자계통학적 유연관계는 털개구리미나리가 왜젓가락나물과 가장 가깝다는 기존의 외부형태학적 보고와 일치하지 않았다. 염기서열 분석에서 털개구리미나라는 조사된 분류군 중 유일하게 다형성을 나타냄으로서, 염색체수와 핵형에 의하여 보고된 털개구리미나라의 다형성을 지지하였다. 털개구리미나리는 ITS 에서 젓가락나물과 왜젓가락나물의 표지 유전자를 공유하고, 엽록체 DNA에서 왜젓가락나물의 표지 유전자를 공유하였다. 이 결과는 염색체수와 핵형에 의하여 제시되었던 털개구리미나리가 젓가락나물과 왜젓가락나물의 잡종화에 의하여 종분화되었다는 가설을 지지하였으며, 왜젓가락나물이 모계이며, 젓가락나물이 부계로 추정된다.

• 한국지반환경공학회 논문집
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• 제11권2호
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• pp.33-42
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• 2010

본 연구는 부산시에 위치한 하천퇴적물에 대한 현재의 오염상태와 혐기성 상태에서의 잠재메탄발생량을 평가하기 위해 실시하였다. 먼저 부산시 하천중 총 5곳을 선정하였고 대상하천의 퇴적물을 채집하였다. 그리고 퇴적물특성을 알아보기 위해 퇴적물의 화학적산소요구량, 강열감량, 총 유기탄소에 대해서 분석을 실시하였고 그 결과 각각 15.20~75.07mg $15.20{\sim}75.07mg\;g^{-1}$, 2.34~11.54%, 1.28~34.21%로 나타났다. 또한 실험실규모의 BMP Test를 실시하였고 그 결과 pH가 약간 증가하다가 약 7.11~7.35에서 평형을 이루었으며, C/N, 최종메탄 및 이산화탄소수율 그리고 생분해도는 각각 1.05~10.27, 10.1~179.4, 10.3~34.4, 4.0~30.1을 나타내었다. 그리고 최종메탄수율과 C/N비, 최종이산화탄소수율, COD, 강열감량, 총유기탄소와의 상관관계를 알아보기 위해 선형모델에 최소자승법을 적용해 평가하였고 그 결과, COD($r^2=0.7586$)와 강열감량($r^2=0.7876$)을 제외한 나머지 모든 항목에서 최종메탄수율과 높은 상관관계를 띔을 알 수 있었다($r^2=0.9795{\sim}0.9858$). 따라서 C/N 또는 TOC 분석결과를 통해 메탄발생수율을 예측 가능할 것으로 판단된다.

• 농업과학연구
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• 제40권1호
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• pp.27-34
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• 2013

본 연구는 원유의 내냉성 미생물의 계절별 분포에 관해 조사하기 위해서 수행하였다. 내냉성 미생물은 최적 생장온도가 $30^{\circ}C$ 근처이지만, $7^{\circ}C$ 이하에서도 생존가능한 균으로 Pseudomonas, Achromobacter, Aeromonas 속 등이 있다. 원유로부터 분리한 총 내냉성 미생물 균수는 다른 계절에 비해 겨울철 원유에서 $3.0{\times}10^4$ CFU/mL로 가장 높은 수준으로 검출되었고, 다른 지역에 비해 B 지역에서 $2.4{\times}10^5$ CFU/mL로 유의적으로 높은 균수가 측정되었다(p<0.05). 분리한 총 706개의 균을 동정한 결과는 Gamma-proteobacteria 강이 전체의 81.02%로 가장 우세하였고, 그 중 Pseudomonas 속이 32.34%로 가장 높은 검출 빈도수를 나타내었으며, 특히 Pseudomonas fluorescens가 39.46%로 가장 우세하였다. 동정된 내냉성 미생물의 지역별 분포는 A 지역은 12개의 Acinetobacter johnsonii, B 지역은 21개의 Pseudomonas fluorescens, C 지역은 13개의 Enterobacter amnigenus, D 지역은 19개의 Psychrobacter maritimus, E 지역은 19개의 Acinetobacter johnsonii, F 지역은 8개의 Acinetobacter haemolyticus, G 지역은 20개의 Pseudomonas fluorescens, H 지역은 9개의 Acinetobacter johnsonii, I 지역은 17개의 Pseudomonas mucidolens가 높은 검출 빈도수를 나타내었다.

• 천문학회보
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• 제46권1호
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• pp.34.4-35
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• 2021

We present the TESS photometry and our high-resolution spectra of the semi-detached Algol EW Boo. For an orbital period study, we collected all available times of minima including ours for the last 30 years. It is found that the eclipse timing variation of the system can be represented by a periodic oscillation of 18.5±1.0 yr plus a secular period increase with a rate of [dP/dt]_orb=-6(±3)×10^-8 d yr^-1. From our observed spectra, the effective temperature of the primary star was determined to be T_eff,1=8560±118 K. From a simultaneous analysis of the TESS light and our double-lined radial velocity curves, the absolute masses, radii, and luminosities are M₁=2.30±0.07M_⊙, M₂=0.38±0.01M_⊙, R₁=1.92±0.02 R_⊙, R₂=1.27±0.01 R_⊙, L₁=1.92±0.02 L_⊙, and L₂=0.752±0.007 L_⊙, respectively. Multiple frequency analyses were carried out for the light residuals after subtracting the binary star model. We detected a total of 75 frequencies in the region of 16.50-104.8 day-1. Our results demonstrate that the more hotter primary star of EW Boo is a δ Sct pulsator by considering its position in the δ Scuti region of the Cepheid instability strip and pulsational characteristics.

• 한국균학회지
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• 제45권4호
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• pp.336-344
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• 2017

본 연구에서는 우리나라 주요 산과 섬에서 분리한 비병원성 야생효모들 중 항염 효과가 우수했던 Meyerozyma guilliermondii YJ34-2와 Rhodotorula graminis YJ36-1의 무세포 추출물들을 제조하여 대식세포 계열 RAW 264.7 세포에 대한 이들의 NO 생성 저해활성과 세포독성을 조사하였다. NO 생성 저해활성은 농도 의존적으로 높아 M. guilliermondii YJ34-2와 R. graminis YJ36-1 무세포 추출물을 1,000 mg/mL 처리 시 각각 51.6%와 81.4%를 보여 가장 높았고 RAW 264.7 세포에 대한 세포 생존율도 1,000 mg/mL 처리시 각각 88.4% (${\pm}3.1$)와 77.1% (${\pm}0.3$)로 가장 높았다. 두 효모들의 무세포 추출물 처리에 따른 prostaglandin $E_2$ 생성량은 농도 의존적으로 감소하여 각각의 무세포 추출물을 1,000 mg/mL 처리했을 때, tumor necrosis factor $(TNF)-{\alpha}$ 생성량이 59.2 (${\pm}43.1$), 73.2 (${\pm}38.1$)%로 감소하였고 prostaglandin $E_2$의 생성량도 52.8 (${\pm}1.9$), 71.2 (${\pm}3.7$)%로 감소하여 이 두 효모들의 항균활성을 검증할 수 있었다. 두 효모들의 NO 생성 저해물질 최적 생산조건을 조사한 결과 M. guilliermondii YJ34-2를 yeast extract-peptone- dextrose (YPD) 배지에 접종하여 $30^{\circ}C$에서 24시간 배양하여 얻은 무세포 추출물이 가장 높은 51.6 (${\pm}0.3$)%의 NO 생성 저해율을 보였고 R. graminis YJ36-1를 YPD 배지에 접종하여 $25^{\circ}C$에서 24시간 배양하였을 때 81.4 (${\pm}1.3$)%의 가장 높은 NO 생성 저해활성을 보였다.

• Biomolecules & Therapeutics
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• 제32권1호
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• pp.154-161
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• 2024

Amyotrophic lateral sclerosis (ALS) is a fatal motor neuron disorder that causes progressive paralysis. L-Citrulline is a nonessential neutral amino acid produced by L-arginine via nitric oxide synthase (NOS). According to previous studies, the pathogenesis of ALS entails glutamate toxicity, oxidative stress, protein misfolding, and neurofilament disruption. In addition, L-citrulline prevents neuronal cell death in brain ischemia; therefore, we investigated the change in the transport of L-citrulline under various pathological conditions in a cell line model of ALS. We examined the uptake of [¹⁴C]L-citrulline in wild-type (hSOD1wt/WT) and mutant NSC-34/ SOD1^G93A (MT) cell lines. The cell viability was determined via MTT assay. A transport study was performed to determine the uptake of [¹⁴C]L-citrulline. Quantitative real-time polymerase chain reaction (qRT-PCR) analysis was performed to determine the expression levels of rat large neutral amino acid transported 1 (rLAT1) in ALS cell lines. Nitric oxide (NO) assay was performed using Griess reagent. L-Citrulline had a restorative effect on glutamate induced cell death, and increased [¹⁴C]L-citrulline uptake and mRNA levels of the large neutral amino acid transporter (LAT1) in the glutamate-treated ALS disease model (MT). NO levels increased significantly when MT cells were pretreated with glutamate for 24 h and restored by co-treatment with L-citrulline. Co-treatment of MT cells with L-arginine, an NO donor, increased NO levels. NSC-34 cells exposed to high glucose conditions showed a significant increase in [¹⁴C]L-citrulline uptake and LAT1 mRNA expression levels, which were restored to normal levels upon co-treatment with unlabeled L-citrulline. In contrast, exposure of the MT cell line to tumor necrosis factor alpha, lipopolysaccharides, and hypertonic condition decreased the uptake significantly which was restored to the normal level by co-treating with unlabeled L-citrulline. L-Citrulline can restore NO levels and cellular uptake in ALS-affected cells with glutamate cytotoxicity, pro-inflammatory cytokines, or other pathological states, suggesting that L-citrulline supplementation in ALS may play a key role in providing neuroprotection.