• Journal of Life Science
• /
• v.10 no.1
• /
• pp.1-5
• /
• 2000

Pectinase was isolated from culture medium of Bacillus sp. BS-214 and purified 105-fold with 3.4% yield by ammonium sulfate precipitation, gel filteration using Sephadex G-75 and DEAE-cellulose followed by gel filteration through Sephadex G-100. The molecular weight of the purified enzyme was estimated to be about 43 kDa on SDS-PAGE and by gel filtration, indicating that the enzyme is a monomer. the optium pH and temperature of the enzyme were 9.0 and 55$^{\circ}C$, respectively. the enzyme was stable at 60$^{\circ}C$ for 30min and in a pH range from 7.5 to 10.5 for 12 h ant 4$^{\circ}C$. The enzyme activity was highly enhanced by Ca2+, and also K+, Li+ and Na+showed a positive effect, while stongly inhibited by Zn2+ and Hg2+.

• Textile Coloration and Finishing
• /
• v.8 no.6
• /
• pp.40-46
• /
• 1996

In order to investigate a practical application of fibrous absorbents to transition metals such as copper, nickel, cobalt, chrome, and iron, amidoximated fiber as a particular class of solid chelate agents were prepared from acrylic fibers treatment with hydroxylamine. The adsorption mechanisms of metal ions onto amidoximated acrylic fibers and their complexes were studied. Amidoximation of acrylic fiber with hydroxylamine is found to be first-order reaction, followed by the disappearance of infrared adsorption peaks due to nitrile groups of acrylic fibers. The uptake of metal ions onto amidoximated acrylic fiber is increased with temperature raising and the adsorption is also depended on pH of the soiutions. About 70% of metal ions can be recovered from aqueous solutions of Ni(II), Co(II), Cr(III), and Fe(II) on the concentration below 5x 10$^$^{-4}$ in the range of pH 2.1~10.0. Transition metals are adsorbed to form complex with amidoxime group by the ligand sites such as C=N, NH, NO, NHOH.OH.

• Journal of Environmental Science International
• /
• v.11 no.1
• /
• pp.15-23
• /
• 2002

The total number of flies collected was 9,707, with sex ratio of 27.9% in Chinju National univ. of education campus. The fauna of fly was found to be 37 species consisting of 15 Calliphoridae, 7 Sarcophagidae, 14 Muscidae and 1 other. The dominant species, Lucillia illustris, Limnophora sp. and Phaenicia sericata constituted 48.9% of the total individuals of flies collected with the trap. The seasonal prevalence of flies was shown from the end of February to the middle of December, and the peaks of files appeared quarterly, in the beginning and the middle of April, in the middle and the end of July and from in the end of September till in the beginning of October. The great peak time of prevalence was in the beginning of October. The peaks of species appeared quarterly, during one year, the great peak time of species was in the end of June which appeared sixteen. As the result of the comparison of the seasonal prevalence of nine predominant species among 37 species collected with fly trap, were found to exhibit a specific character and showed the pattern of the each species.

• Korean Journal of Veterinary Research
• /
• v.8 no.2
• /
• pp.80-83
• /
• 1968

This study was conducted to ramify of the Rami lienales at the hilus of the spleen in Korean cattle. The materials used were fifty spleens, 25 fresh samples, and 25 Cast specimens. The results obtained are summarized as follows. 1. The splenic arteries were divided into 2 Rami lienales (32 cases, 64%) and 3 Rami lienales(18 cases, 36%). and their branches were nominated as Aa, terminales superior et inferior and A. polares superior. 2. To ramify the A. terminalis superior and A. terminalis inferior, only one case diverged in the splenic parenchyma and 49 cases diverged in the outside of the spleen. 3. Immediately after dividing from the splenic artery to the Aa. terminales superior and inferior, the calibres of the A. terminalis inferior were larger than the A. terminalis superior (sup. 5.5 mm., inf. 8. 5mm.). 4. It was also observed, in all samples used. that Rami lienalis of the splenic artery were not anastomosis in the out side of the spleen.

• Korean Journal of Veterinary Research
• /
• v.8 no.2
• /
• pp.84-91
• /
• 1968

The arteries in and under the brain of the fowl were invesitigated. Arteries of the brain were injected with neoplen latex into the arteria carotis communis. Those were fixed in 10--- formalin. After fixation, those brain were carefully removed from the cranial cavity doing not wound the arteries of the brain. The results of observation on the arterial supply under the brain surface were essentially the same as those obtained by Hofmann Shiina and Mjyata, Kaku, and Kithoh. The nomenclature of the arteries used by other authers were written in the discussion. In this observation, several conclusions were obtained. 1. In the arteries under the brain of the fowl, their front anastomoses forming the circle of Willis under the brain surface of the mammalia were not seen in all brain. 2. It is very difficult to indicate so called A. cerebri anterior as only one artery ramus. 3. Artery distribution of the two-third in the fissura longitudinal cerebri surface originate from on1y one side in the left or right A. cerebri posterior, and origins of the right side were man number than left. 4. The origin of the A. basilaris originate from only one side R. posterior, therefore their origin were more left than right. 5. There is Rami arteries that branch from A. ethmoidalis to Chiasma opticum in all cases.

• The Plant Pathology Journal
• /
• v.17 no.3
• /
• pp.180-183
• /
• 2001

A corynespora leaf spot of pepper, which has not been reported previously in Korea, occurred severely at the major pepper cultivation area of Chinju, Gyeongnam province in 2001. Infection rate ranged from 48.2 to 84.7% in eight fields surveyed. The causal fungus was identified as Corynespora cassicola based on the following cultural and morphological characteristics. The fungi grew well on potato dextrose agar, showing gray to brown color with cultural age. Conidia formed solitary or catenary were obclavate to cylindrical in shape, and pale olivaceous brown or brown in color. They had 420 pseudoseptate and isthmus, and measured 42.7-197.6 x 9.3-$23.5\mu\textrm{m}$. Septate conidiophores were pale to light brown in color, and measured 116.5-836.0 x 4.2-$11.0\mu\textrm{m}$. Conidia germinated as a bi-polar type. Optimal temperature for mycelial growth and conidial germination was $30^{\circ}$ and 25-$30^{\circ}$, respectively. The fungus showed strong pathogenicity to pepper plant, and the symtoms on pepper by the artificial inoculation were similar to those observed in the field. This is the first report on the corynespora leaf spot on pepper (Capsium annuum) caused by Corynespora cassicola in Korea.

• International Journal of Aeronautical and Space Sciences
• /
• v.2 no.2
• /
• pp.65-72
• /
• 2001

This paper demonstrates an explicit-implicit, finite element analysis for linear as well as nonlinear hygrothermal stress problems. Additional features, such as moisture diffusion equation, crack element and virtual crack extension(VCE) method for evaluating J-integral are implemented in this program. The Linear Elastic Fracture Mechanics(LEFM) Theory is employed to estimate the crack driving force under the transient condition for an existing crack. Pores in materials are assumed to be saturated with moisture in the liquid form at the room temperature, which may vaporize as the temperature increases. The vaporization effects on the crack driving force are also studied. The ideal gas equation is employed to estimate the thermodynamic pressure due to vaporization at each time step after solving basic nodal values. A set of field equations governing the time dependent response of porous media are derived from balance laws based on the mixture theory. Darcy's law is assumed for the fluid flow through the porous media. Perzyna's viscoplastic model incorporating the Von-Mises yield criterion are implemented. The Green-Naghdi stress rate is used for the invariant of stress tensor under superposed rigid body motion. Isotropic elements are used for the spatial discretization and an iterative scheme based on the full Newton-Raphson method is used for solving the nonlinear governing equations.

• East Asian mathematical journal
• /
• v.22 no.2
• /
• pp.223-238
• /
• 2006

• The Plant Pathology Journal
• /
• v.15 no.2
• /
• pp.93-98
• /
• 1999

• 한국정보교육학회:학술대회논문집
• /
• 2004.08a
• /
• pp.389-396
• /
• 2004

입문기 아동의 수학 교육에서의 첫 걸음은 수 개념 형성으로부터 시작되는데 취학 전에 발달 단계나 학습 순차를 무시한 형식적인 수지도가 수 개념을 형성하는데 별다른 도움을 주지 못하는 것으로 나타나 있다. 수학 교과가 가지고 있는 논리적 위계성을 감안할 때 이전 학년에서 발생된 학습 결손이나 개념 이해부족은 다음 학년의 학습을 지속해 나가기가 어렵다. 이와 같은 학습의 과정이 반복되면 학습 부진을 증대시켜 학습에 흥미를 잃게 한다. 이에 본 연구는 수학과 기초 학습력을 신장시키며 취학 전에 발달단계를 무시한 잘못된 수 경험을 개선하고자 멀티미디어 웹 코스웨어인 '50까지의 수'를 설계 및 구현하였다.