• 생물정신의학
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• 제9권1호
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• pp.3-7
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• 2002

Genes involved in the serotonin system are good candidates for the pathogenesis of mood disorder and mood-related disorders, such as eating disorder, obsessive-compulsive disorder, alcoholism, and suicide. Serotonin type 2A(5-HT2A) receptor gene promoter polymorphism(-1438A/G) has been reported. In this article, authors reviewed the literatures regarding association studies between -1438A/G and mood disorder and mood-related disorders. There are controversial results with limited data to date. Further researches on the -1438A/G in psychiatric disorders are required.

• Asian-Australasian Journal of Animal Sciences
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• 제16권10호
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• pp.1438-1442
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• 2003

A method for the determination of nitrogen in ruminant feedstuffs, products and excreta (e.g. milk and urine) using a spectrophotometer is developed, where samples processed for P determination are also used to determine N. Samples are digested with sulphuric acid and subsequently with hydrogen peroxide in Kjeldahl tubes. Digested solutions along with phenol and buffered alkaline hypochlorite reagents are incubated in a water bath at $37^{\circ}C$ for 30 min and presented in the spectrophotometer. The spectrophotometer set at 625 nm measures the concentration of N of each sample. Nitrogen in 261 of the samples was also determined by the classical Kjeldahl method in order to develop a relationship between N determined by the Kjeldahl method (Y) and the colorimetric method (X). The mean value of Y was as high as that of X (0.92 vs. 0.96; p>0.05). The colorimetric method predicted Kjeldahl N highly significantly (Y=0.985X-0.024, $R^2=0.993$, p<0.001; or more simply Y=0.974X, $R^2=0.993$, p<0.001). An analysis of regression found no difference (p>0.05; both t-test and F-test) between colorimetric (0.96% N) and adjusted (0.96% N) N. In comparison with the Kjeldahl method, the analytical capacity of N by colorimetric method increases greatly, where 200-300 determinations of N are possible in a working day. In addition, the system provides an opportunity to use not only the same digested solution for both N and P determination of a particular sample, but also uses the same spectrophotometer to assay both N and P. Therefore, the system may be attractive in situations where both elements of a sample are to be determined. In conclusion, the speed of N determination, low cost, efficient use of labour, time and reagents, fewer items of equipment, and the reduction of environmental pollution by reducing effluent and toxic elements are the advantages of this method of N determination.

• The Korean Journal of Pain
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• 제31권3호
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• pp.183-190
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• 2018

Background: Vitamin B12 deficiency has been associated with peripheral neuropathy, loss of sensation in the peripheral nerves, and weakness in the lower extremities. Methylcobalamin is the most effective analogue of vitamin B12 used to treat or prevent the complications associated with vitamin B12 deficiency. The current study aimed to compare the serum cobalamin levels after administration of two different regimes of methylcobalamin in peripheral neuropathy patients. Methods: The present study was a prospective, randomized, comparative study. The study consisted of two parallel groups, group A (methylcobalamin $500{\mu}g$ injection intramuscularly three times a week) and group B (methylcobalamin $1500{\mu}g$ injection intramuscularly once a week). A control group of healthy volunteers was also included. Results: A total of 24 patients (12 in each group) were included in the study. Five healthy volunteers were also included as a control in each group. At the end of treatment, serum cobalamin levels were significantly (P = 0.028) higher in group A ($1892.08{\pm}234.50$) as compared with group B ($1438.5{\pm}460.32$). The serum cobalamin levels in Group A healthy volunteers were also two times higher than that of group B (P = 0.056). Both the LANSS scale and DN4 questionnaire reported similar results at end of treatment. Conclusions: The $500{\mu}g$ methylcobalamin thrice weekly regime is more effective in increasing the serum cobalamin levels as compared to the $1500{\mu}g$ methylcobalamin once weekly regime.

• Journal of Microbiology and Biotechnology
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• 제31권10호
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• pp.1438-1445
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• 2021

A bifunctional glycoside hydrolase GH78 from the ascomycete Xylaria polymorpha (XpoGH78) possesses catalytic versatility towards both glycosides and esters, which may be advantageous for the efficient degradation of the plant cell-wall complex that contains both diverse sugar residues and esterified structures. The contribution of XpoGH78 to the conversion of lignocellulosic materials without any chemical pretreatment to release the water-soluble aromatic fragments, carbohydrates, and methanol was studied. The disintegrating effect of enzymatic lignocellulose treatment can be significantly improved by using different kinds of hydrolases and phenoloxidases. The considerable changes in low (3 kDa), medium (30 kDa), and high (> 200 kDa) aromatic fragments were observed after the treatment with XpoGH78 alone or with this potent cocktail. Synergistic conversion of rape straw also resulted in a release of 17.3 mg of total carbohydrates (e.g., arabinose, galactose, glucose, mannose, xylose) per gram of substrate after incubating for 72 h. Moreover, the treatment of rape straw with XpoGH78 led to a marginal methanol release of approximately 17 ㎍/g and improved to 270 ㎍/g by cooperation with the above accessory enzymes. In the case of beech wood conversion, the combined catalysis by XpoGH78 and laccase caused an effect comparable with that of fungal strain X. polymorpha in woody cultures concerning the liberation of aromatic lignocellulose fragments.

• Journal of Microbiology and Biotechnology
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• 제26권8호
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• pp.1428-1438
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• 2016

In the present work, Arthrobacter sp. 25, a lead-tolerant bacterium, was assayed to remove lead(II) from aqueous solution. The biosorption process was optimized by response surface methodology (RSM) based on the Box-Behnken design. The relationships between dependent and independent variables were quantitatively determined by second-order polynomial equation and 3D response surface plots. The biosorption mechanism was explored by characterization of the biosorbent before and after biosorption using atomic force microscopy (AFM), scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. The results showed that the maximum adsorption capacity of 9.6 mg/g was obtained at the initial lead ion concentration of 108.79 mg/l, pH value of 5.75, and biosorbent dosage of 9.9 g/l (fresh weight), which was close to the theoretically expected value of 9.88 mg/g. Arthrobacter sp. 25 is an ellipsoidal-shaped bacterium covered with extracellular polymeric substances. The biosorption mechanism involved physical adsorption and microprecipitation as well as ion exchange, and functional groups such as phosphoryl, hydroxyl, amino, amide, carbonyl, and phosphate groups played vital roles in adsorption. The results indicate that Arthrobacter sp. 25 may be potentially used as a biosorbent for low-concentration lead(II) removal from wastewater.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 춘계학술대회 논문집
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• pp.1438-1441
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• 2005

To establish of standard technique of nano-length measurement in 2D plane, new AFM system has been designed. In this system, measurement uncertainty is dominantly affected by the Abbe error of XY scanning stage. No linear stage is perfectly straight; in other words, every scanning stage is subject to tilting, pitch and yaw motion. In this paper, an AFM system with minimum offset of XY sensing is designed. And XY scanning stage is designed to minimize rotation angle because Abbe errors occur through the multiply of offset and rotation angle. To minimize the rotation angle optimal design has performed by maximizing the stiffness ratio of motion direction to the parasitic motion direction of each stage. This paper describes the design scheme of full AFM system, especially about XY stage. Full range of fabricated XY scanner is $100um\times{100um}$. And tilting, pitch and yaw motion are measured by autocollimator to evaluate the performance of XY stage. Using this AFM system, 3um pitch specimen was measured. As a result, the uncertainty of total system has been evaluated.

• Asian-Australasian Journal of Animal Sciences
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• 제17권10호
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• pp.1438-1445
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• 2004

The objective of this study was to determine the effects of dietary Zn level on performance, serum Zn concentrations, alkaline phosphatase activity (ALP), and immune response of pigs inoculated with Porcine Reproductive and Respiratory Syndrome virus (PRRSv) and Mycoplasma hyopneumoniae. A $2{\times}4$ factorial arrangement of treatments was used in a randomized design. Factors included; 1) PRRSv and M. hyopneumoniae inoculation (n=36 pigs) or sham inoculation (n=36 pigs) with media when pigs entered the grower facility (d 0) at 9 weeks of age and 2) 10, 50, 150 ppm supplemental Zn sulfate (${ZnSO}_4$) from weaning until the completion of the study, or 2,000 ppm supplemental ${ZnSO}_4$for two weeks in the nursery and then supplementation with 150 ppm ${ZnSO}_4$for the remainder of the trial. The basal diet contained 34 ppm Zn. Pigs were weighed on d 0, 10, 17, 24 and 31 and blood samples were collected on d 0, 7, 14, 21 and 28. Pigs inoculated with PRRSv were serologically positive at d 28 and control pigs remained negative to PRRSv. In contrast, the M hyopneumoniae inoculation was inconsistent with 33.3% and 52.8% of pigs serologically positive at d 28 in the control and infected groups, respectively. A febrile response was observed for approximately one week after inoculation with PRRSv. Feed intake (p<0.01) and gain (p<0.1) were less in PRRSv infected pigs than control pigs for the 31 d study. However, performance did not differ among pigs in the four levels of ${ZnSO}_4$. Assessments of immune responses failed to provide unequivocal influence of either PRRSv inoculation or ${ZnSO}_4$level. These data suggest that PRRSv and M. hyopneumoniae act to produce some performance deficits and the influence of Zn supplementation of nursery age pigs does not have clear effect in grower pigs affected with disease.

• Journal of Astronomy and Space Sciences
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• 제34권2호
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• pp.171-182
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• 2017

In this study, the internal structure of a Heumgyeonggak-nu (欽敬閣漏) was designed, and the power transmission mechanism was analyzed. Heumgyeonggak-nu is an automated water clock from the Joseon Dynasty that was installed within Heumgyeonggak (欽敬閣), and it was manufactured in the $20^{th}$ year of the reign of King Sejong (1438). As descriptions of Heumgyeonggak-nu in ancient literature have mostly focused on its external shape, the study of its internal mechanism has been difficult. A detailed analysis of the literature record on Heumgyeonggak-nu (e.g., The Annals of the Joseon Dynasty) indicates that Heumgyeonggak-nu had a three-stage water clock, included a waterfall or tilting vessel (欹器) using the overflowed water, and displayed the time using a ball. In this study, the Cheonhyeong apparatus, water wheel, scoop, and various mechanism wheels were designed so that 16 fixed-type scoops could operate at a constant speed for the water wheel with a diameter of 100 cm. As the scoop can contain 1.25 l of water and the water wheel rotates 61 times a day, a total of 1,220 l of water is required. Also, the power gear wheel was designed as a 366-tooth gear, which supported the operation of the time signal gear wheel. To implement the movement of stars on the celestial sphere, the rotation ratio of the celestial gear wheel to the diurnal motion gear ring was set to 366:365. In addition, to operate the sun movement apparatus on the ecliptic, a gear device was installed on the South Pole axis. It is expected that the results of this study can be used for the manufacture and restoration of the operation model of Heumgyeonggak-nu.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 제37회 하계학술대회 논문집 C
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• pp.1438-1439
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• 2006

$Ge_{2}Sb_{2}Te_5$(GST) thin film at present is a promising candidate for a phase change random access memory (PCRAM) based on the difference in resistivity between the crystalline and amorphous phase. PCRAM is an easy to manufacture, low cost storage technology with a high storage density. Therefore today several major chip in manufacturers are investigating this data storage technique. Recently, A. Pirovano et al. showed that PCRAM can be safely scaled down to the 65 nm technology node. G. T Jeonget al. suggested that physical limit of PRAM scaling will be around 10 nm node. Etching process of GST thin ra films below 100 nm range becomes more challenging. However, not much information is available in this area. In this work, we report on a parametric study of ICP etching of GST thin films in $Cl_2$/Ar chemistry. The etching characteristics of $Ge_{2}Sb_{2}Te_5$ thin films were investigated using an inductively coupled plasma (ICP) of $Cl_2$/Ar gas mixture. The etch rate of the GST films increased with increasing $Cl_2$ flow rate, source and bias powers, and pressure. The selectivity of GST over the $SiO_2$ films was higher than 10:1. X-ray photoelectron spectroscopy(XPS) was performed to examine the chemical species present in the etched surface of GST thin films. XPS results showed that the etch rate-determining element among the Ge, Sb, and Te was Te in the $Cl_2$/Ar plasma.

• 한국식품영양과학회지
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• 제34권7호
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• pp.987-999
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• 2005

본 연구는 단기간의 영양교육캠프가 비만아동의 식품과 영양소 섭취에 미치는 영향을 조사하고자 하였다. 연구대상은 경상북도 구미시에 거주하는 비만도 $130\%$이상 비만아동 30명이었으며, 이들과 학부모를 대상으로 여름과 겨울방학을 이용하여 2회의 영양교육 캠프를 실시하였다. 식품 및 영양소 섭취상태는 영양교육 캠프 전$\cdot$중$\cdot$후의 3회에 걸쳐 3일간 식품기록법을 이 용하여 조사되었다. 평균연령은 남녀 각각 10.2, 10.0세였다. 평 균 체중은 남녀 각각 $51.0\pm9.1kg,\;52.7\pm10.4kg$이었고, 평균 신장은 남녀 각각 $144.7\pm6.8cm,\;142.2\;8.7cm$였으며, BMI는 남아가 $24.3\pm4.5$, 여아가 $26.2\pm5.4$였다. 일일 평균 식품 총섭취량은 캠프 전 $1646.64\pm1403.6g$, 캠프 중 $1438.6\pm 1130.6g$, 캠프 후$1412.66\pm881.43g$으로 차츰 감소하였다. 이중에서 식물성 식품군으로부터 $74.6\~66.7\%$를 섭취하였고, 동물성 식품군으로부터 $25.4\~33.3\%$를 섭취하였다. 섭취량이 가장 높았던 식품군은 곡류였으며, 그 다음이 과실류, 우유류, 채소류, 음료류, 육류, 난류, 두류 순이었다. 곡류, 두류의 섭취량은 영양교육 캠프전에 비해 캠프 중과 후에 유의하게 낮았고, 난류의 섭취는 캠프중에 감소하였다가 캠프후에 다시 증가하였으며 어패류의 섭취량은 캠프 중과 후에 유의하게 높아졌다. 영양교육 캠프 후 섭취량이 유의하게 변화한 것은 에너지와 당질 및 비타민 C였다. 에너지 섭취량은 캠프 전에 RDA의 $105.9\%$에서 캠프 후에 RDA의 $91.6\%$로서 유의하게 낮아졌으며 당질의 섭취량도 캠프 전$(323.02\pm235.83\;g/d)$에 비해 캠프 후 $(282.57\pm143.41\;g/d)$에 유의하게 감소하였다. 비타민 C의 섭취는 캠프 전$(108\%\;RDA)$에 비해 캠프 후$(166\%\;RDA)$에 유의하게 증가하였다. 비만아동들이 RDA에 비해 낮게 섭취한 영양소는 칼슘과 비타민 $B_2$로 나타났다. 3대 열량 영양소로부터의 에너지 섭취비율에서 지방 에너지 섭취율은 경우 기간에 따라 유의한 차이가 없었으나, 단백질 에너지 섭취율은 영양교육 캠프 후 유의하게 높아졌고, 당질 에너지 비율은 유의하게 낮아졌다. 동물성과 식물성 급원별 일일 주요영양소(단백질, 지방, 칼슘, 철) 섭취량은 영양교육 캠프의 영향을 받지 않았다. 칼슘은 동물성$\cdot$식물성 급원의 섭취 비율이 60:40, 철분은 20:80으로 나타났다. 곡류와 우유류의 에너지 섭취율은 캠프 전에 비해 캠프 중과 후에 유의하게 감소하였고, 난류의 에너지 섭취율은 캠프 중에 유의하게 낮았다. 단백질의 경우 곡류와 감자류, 채소류, 어패류로부터의 섭취율이 캠프 후에 유의하게 증가하였고, 지방은 곡류, 우유류로부터의 섭취율이 캠프 후 유의하게 감소하였다 칼슘의 경우 감자류와 우유류로부터의 섭취율이 캠프 중과 후에 유의하게 증가하였고, 난류로부터 유의하게 감소하였다. 철의 경우 감자류와 어패류로부터 섭취율이 캠프 중과 후에 유의하게 증가하였고, 곡류로부터의 섭취율이 캠프 중에 유의하게 낮았다. 비타민 A의 경우 해조류와 난류로부터의 섭취율이 캠프 후에 유의하게 증가하였고, 채소류로부터의 섭취율이 캠프 중에 유의하게 높았고 비타민 $B_1$은 채소류와 어패류로부터의 섭취율이 캠프 중에 유의하게 높은 것으로 나타났다. 조섬유의 경우 곡류로부터 얻은 양이 캠프 중과 후에 유의하게 감소하였으며, 콜레스테롤의 경우 난류로부터 얻은 양이 캠프 중에 유의하게 낮았다. 이상의 결과로부터 2주일간의 하계 영양교육캠프와 3일간의 동계 영양교육캠프 후 비만아동들은 식품 총섭취량과 곡류식품의 유의한 감소와 어패류 섭취량의 유의한 증가를 보였다. 영앙소 섭취면 에서는 열량과 탄수화물 섭취량의 유의한 감소와 단백질과 비타민 C 섭취량의 유의한 증가와 칼슘과 철분의 섭취 증가 양상을 보였다. 열량섭취에서는 당질 에너지 섭취율의 감소와 단백질 에너지섭취율의 증가를 보였다. 따라서 영양교육캠프의 실시가 비만아동들의 전반적인 식품과 영양소 섭취상태의 변화에 긍정적인 효과를 미친 것으로 나타났다.