• 고려인삼학회:학술대회논문집
• /
• 고려인삼학회 1988년도 학술대회지
• /
• pp.129-132
• /
• 1988

인삼은 한국, 일본, 소련, 북미에서 재배되고 있다. 이들 생산지역의 미세기상을 각각 조사해 보면, 인삼의 생육에 필요한 필수조건을 갖고 잇으며 각 지역에 따라 미세기상은 다른 방법으로 조절되고 있다, 한국, 중국에서의 최근연구자료를 비교해 보면 인삼생산에 맞는 여러가지 미세기상 조건들을 구명 할 수 있을 것이며, 여러가지 해가림 재료에 따른 일광차단에 관한 연구도 미세기상 조건구명의 한가지 방법이 되고 있다. 북미에서는 나무와 polypropylene 해가림 재료가 사용되지만, 중국에서는 마른 풀을 엮은 이엉사이에 polyvinylchloride film을 넣어 해가림을 한다. 이러한 해가림 재료들이 인삼생육과 수량에 미치는 효과는 뿌리생육에 있는 것 같으며, 생육기간 중 대부분 뿌리의 생육 적온에 미치지 못하고 있다. 년근별 생육자료를 분석해 보면, 근권의 토양온도가 지상부와 뿌리의 건물 분배에 미치는 효과를 구명하는데 유용할 것이다.

• 분석과학
• /
• 제35권3호
• /
• pp.124-128
• /
• 2022

혈액을 증강하기 위해 사용하는 시약은 혈액 이외의 다른 물질의 영향을 받아 위양성 혹은 위음성을 나타낼 수 있다. 이런 반응이 일어나면 혈액 증거를 잘못 해석할 수 있으므로 혈흔 증강 시약의 위양성 및 위음성 가능성에 대한 조사는 필수적이다. 산성 과산화수소(acidic hydrogen peroxide, AHP)는 최근에 알려진 혈액 증강 시약으로, 위양성 혹은 위음성을 유발하는지에 대해 알려진 바가 없다. 이를 확인하기 위해 금속 표면, 플라스틱 표면, 종이 표면, 페인트 표면, 음식류, 식물성 기름, 세제류, 석유계 탄화수소에 혈액 20 µL을 남긴 후 AHP를 처리하였다. 이 혈액을 505 nm 광원을 비추며 오렌지색 필터를 통해 관찰 한 결과 모든 물질에서 위양성 혹은 위음성 반응이 관찰되지 않았다. 그러나 polyethylene terephthalate 표면, polyvinylchloride 표면, 일부 페인트 표면, 음식류는 AHP를 처리한 혈액 관찰 조건에서 자체 광발광을 나타내 혈액 관찰을 방해한다는 점을 확인할 수 있었다.

• 대한미생물학회지
• /
• 제18권1호
• /
• pp.73-85
• /
• 1983

The advantages of the enzyme-linked immunosorbent assay(ELISA) are its sensitivity and its simplicity in detecting IgM and IgG antibodies. For applying the ELISA to the diagnosis of typhoid fever, first of all, experiments were performed to determine which concentration of killed whole cell antigens and lipopolysaccharide(LPS) antigens of S. typhi(0.901 w) were optimally coated to the wells of the polystyrene and polyvinylchloride microplate, using the hyperimmune sera from rabbits against S. typhi. By using both kinds of antigens of S. typhi adsorbed to the ELISA microplate, the changing patterns of IgG and IgM antibodies in the sera from rabbits responding to the killed whole cell antigens of S. typhi(0901 w) during the prolonged immunization were serially traced by the ELISA. At the same time, the level of antibodies against S. typhi in sera fron patients with typhoid fever and from normal healthy persons were measured by the ELISA employing the killed whole cell antigens and LPS antigens as the coating antigens. The results obtained were summerized as follow: 1. The optimal concentration of the killed whole cell antigens, which were more easily adsorbed to the polystyrene plate than the polyvinylchloride plate, was $10^8cells/ml$ of carbonate buffer(pH. 9.6) on the wells of the polystyrene plate when treated at $37^{\circ}C$ for 4 hours. On the other hand, the optimal concentration of lipopolysaccharide antigens, which were adsorbed only to the polyvinylchloride plate, was $100{\mu}g/ml$ of carbonate buffer(pH. 9.6) on the wells of the polyvinylchloride plate when treated at $37^{\circ}C$ for 4 hours. 2. IgM antibody response were dominating in rabbits responding to the killed whole cell antigens of S. typhi(0.901 w), and were more specific to the LPS antigens than to the killed whole cell antigens in the ELISA. Good correlations were made between the IgM titers by the ELISA and the aggglutinating titers of sera from the immunized rabbits. 3. Both IgG and IgM agglutination titers by the ELISA in sera from most of patients with typhoid fever were above 1:320 but those in sera from most of normal, healthy persons were below 1:80. 4. There were close correlations between the antibody titers by the ELISA and the agglutinating titers to the killed whole cell antigens in the tested human sera, IgM titers being more correlated with the agglutinating titers than IgG titers. But a little correlations were made between the antibody titers by the ELISA and the agglutinating titers to the LPS antigens. 5. IgM titers in the tested human sera were similar to IgG titers detected by the ELISA employing the killd whole cells antigens and the LPS antigens. 6. Good correlations were made between the antibody titers demonstrated by the ELISA performed on the killed whole cell antigens and the LPS antigens as the different, coating antigens on the ELISA microplates.

• 한국식품영양과학회지
• /
• 제27권6호
• /
• pp.1137-1142
• /
• 1998

Modified atmosphere packagings were designed by combining the respiration characteristics of the enoki mushroom at 10oC and the measured film permeabilities to O2 and CO2 gases to attain the beneficial package atmosphere were fabricated and tested during storage. The packages of 100g size with 30 m low density polyethylene and cast polypropylene showed the good agreement between estimated and experimental package atmospheres. However, polyvinylchloride stretch wrap packs showed the gas composition close to the air, which was due to leaking of stretch wrapping. The CPP package attaining O2 below 1% and CO2 concentration of 15~20% gave the best retention of quality and thus the longest shelf life among the tried packages, and it was superior to the others in the Hunter L value, stipe elongation and sensory qualties.

• 한국생물환경조절학회:학술대회논문집
• /
• 한국생물환경조절학회 1998년도 임시총회 및 학술논문발표요지
• /
• pp.99-102
• /
• 1998

우리나라 윈예생산 시설의 피복에 사용되는 피복자재는 값이 싸고 설치가 쉬우며 비교적 광투과율이 높고 시설에 피복할 경우 긴밀도가 뛰어나 보온력이 우수한 플라스틱 필름이 99 % 이상을 차지하고 있다. 최근에 플라스틱 필름의 종류는 다양하게 발전하여 소재는 PE(polyethylene), EVA(ethylene vinylacetate), PVC(polyvinylchloride), 등의 연질필름과 PET(poly ethylene terephthalate) 그리고 ETFE(ethylene tetrafluoride ethylene) 등의 반경질핌름으로 되어 있다. (중략)

• Journal of Mechanical Science and Technology
• /
• 제17권10호
• /
• pp.1485-1495
• /
• 2003

We investigate the triboelectrostatic separation of polyvinylchloride (PVC) from mixed plastics in the laboratory scale triboelectrostatic separation system. The flow and electric fields in the precipitator are obtained from the numerical solution of finite volume method. Using these flow and electric fields, we solved the particle motion equation considering the inertia, drag, gravity and electrostatic forces acted on the particles. The particle trajectories are obtained using a Lagrangian method as a function of different important variables such as Reynolds number, Stokes number, electrostatic force, electric charge and electric field distribution, inclined angle of plane electrodes, particle rebounding, particle charge decay rate after impact on the electrode surface, etc., in order to determine the optimal design conditions. The present predicted results for the cumulative yield represent well the experimental ones.

• 한국생물환경조절학회:학술대회논문집
• /
• 한국생물환경조절학회 2003년도 춘계 학술대회 논문집
• /
• pp.92-97
• /
• 2003

비닐하우스에서 피복자재로 폴리에틸렌(polyethylene), 초산비닐(ethylene vinyl-acetate) 및 염화비닐(polyvinylchloride)와 같은 연질필름을 90% 이상 사용하고 있으나 필름 표면에 물방울이 맺히는 것을 방지하는 무적성과 각종 먼지 등이 부착하는 것을 억제하는 방진성의 저하로 시설내 투광률이 5-l5% 떨어지고 다습하여 딸기와 같은 작물에 해로운 잿빛곰팡이병 발생이 심하여 생산성이 크게 떨어지고 있다('92, '97 원예연구소, '91 Jaffrin). (중략)

• Toxicological Research
• /
• 제17권2호
• /
• pp.91-96
• /
• 2001

Phthalates are widely used as plasticizers to impart softness and flexibility to normally rigid polyvinylchloride products. However, there are not much studies jar dermal and ocular irritation toxicity of phthalates. So we investigated the skin or eye irritation effect of some phthalates which was not reported. The primary skin irritation of diethyl phthalate (DEP), diisodecyl phthalate (DIDP), diisononyl phthalate (DINP), dipropyl phthalate (DPP) and dipropyl phthalate (DPrP) was studied. The ocular irritation of dibutyl phthalate(DBP), DIDP, DINP, DPP and DPrP was also studied. DEP, DIDP, DINP, DPP, and DPrP were found to be non-irritating to the skin of the test animals. DBP, DIDP, DINP and DPP were found to be non-irritating to the eye of the rabbits. DPrP caused the slight irritations to the eye in 1 or 2 days after treatment but irritation of the animals was soon recovered.

• Journal of Biosystems Engineering
• /
• 제37권3호
• /
• pp.209-213
• /
• 2012

Purpose: This study was performed to develop a simple, disposable thin-film optical nitrate sensor. Methods: The sensor was fabricated by applying a nitrate-selective polymer membrane on the surface of a thin polyester film. The membrane was composed of polyvinylchloride (PVC), plasticizer, fluorescent dye, and nitrate-selective ionophore. Fluorescence intensity of the sensor increased on contact with a nitrate solution. The fluorescence response of the optical nitrate sensor was measured with a commercial fluorospectrometer. Results: The optical sensor exhibited linear response over four concentration decades. Conclusions: Nitrate ion concentrations in plant nutrient solutions can be determined by direct optical measurements without any conditioning before measurements.

• 멤브레인
• /
• 제3권3호
• /
• pp.136-139
• /
• 1993

It is well known that the membrane permeation in pervaporation is governed by both the chemical nature of the membrane material and the physical structure of the membrane and also the separation can be achieved by differences in either solubility, size or shape. The solubility of the penerrant in the polymeric membrane can be described qualitively by applying the Hildebrand relation [1] which relates the energy of mixing of the penerrant and the polymer material. Froehling et al. have tried to predict the swelling behavior of polymers for the systems of polyvinylchloride(PVC)-toluene-methanol, PVC-trichloroethylene-nitromethane and PVC-n-butylacetate-nitromethane[2]. The former two systems which do not show the donor/acceptor interactions upon mixing showed the successful results[2]. In addition to this technique, there are several other possible approaches to predict the swelling behaviors of polymers, such as the surface thermodynamic approach[3, 4], the comparison of the membrane polarity with the solvent polarity in terms of Dimroth's solvent polarity value[5].