• The Korean Journal of Ecology
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• 제16권2호
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• pp.191-198
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• 1993

The relationships between microbial activity and disturbance level of soil were investigated from 15 parks in Seoul and undisturbed area. The physico-chemical characteristics of soil and dehydrogenase activity(DHA) as an index of soil microbial activity were analysed. There were ranges of 3.84~7.37 in pH, 9.63~40.33% in moisture content, 3.41~21.49% in organic matter, 0.36~0.79g/g in water holding capacity and 0.03~0.53% in total nitrogen investigated sites. DHA values of soil were 8.64~$146.76{\mu}g/g$ in park soil and 545.14~$1, 198.80{\mu}g/g$ in undisurbed area. DHA of park soil with high traffic density and contamination source from human activities was much lower than that of undisturbed area. DHA was positively correlated with moisture content, organic matter, water holding capacity and total nitrogen.

• 한국환경과학회지
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• 제11권6호
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• pp.529-535
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• 2002

Efffcts of physico-chemical factors on the zonation and vertical distribution of benthic microalgal communities in the tidal flats of Youngkwang and Canaiin, Korea, were studied. Concentrations of nutrients were low throughout the study period. A 38 species of benthic microaigae was identified. Most of the algae were pennate diatoms with small size. Cell numbers at silty sediments were higher than sandy sediments, and showed high patchy distribution. Zonal distributions of benthic microalgae showed higher variation from silty sediment than sandy sediments. Benthic microalgae showed vertical migration within the upper few mm of sediment with periodicity closely related to tidal cycles. Maximum cells were observed from 0 mm depth both sandy and silty sediments. Cells of benthic microalgae in the 1 - 2 mm depth decreased after desiccation of sediments. The variation of cells was higher at sandy sediments than silty sediments. Cell numbers of benthic microalgae showed no positive relationships with pH and nutrinets except NH$_4$-N.

• 한국생활과학회지
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• 제13권6호
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• pp.1031-1036
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• 2004

Effects of irradiation on physico-chemical properties of beef and pork loins were examined. Beef and pork were irradiated at dose levels of 0, 0.5, 1, 2, 3, and 5 kGy with a use of Co-60 source. The drip loss of beef increased from 0 kGy to 5 kGy, whereas that of pork remained unchanged. TBA values of beef and pork increased due to irradiation. Irradiation caused a decrease in the lightness, redness, and yellowness of beef, whereas it did an increase in the same properties of pork. Irradiation also contributed to an increase in the solubility of salt soluble protein.

• 동아시아식생활학회지
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• 제11권3호
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• pp.204-208
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• 2001

This study was conducted to investigate physicochemical properties and anti-allergic properties of walnut oil. pH, acid value and iodine value of walnut oil were respectively 4.9, 0.8 and 117. Most of general composition of walnut oil was crude fat(99.9%) Vitamin A and E were 0.06 and 10.25mg/100g and the major fatty acids of walnut oil was linoleic acid(62.8%). Total phenolics and antiallergic effects of walnut oil were estimated 27mg% and 62.82% at the concentration of 0.5% ethanol walnut oil. These results suggest that the walnut oil can provide one of the valuable resource for the functional foods.

• 한국수산과학회지
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• 제5권2호
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• pp.57-62
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• 1972

잉어의 배육 골격근에서 actomyosin을 추출하여 몇 가지 생물물리화학적인 성질을 측정 검토한 결과는 다음과 같다. 즉, actamyosin의 침강 정수($s_{20},\;_\omega$)는 24.76s이고 그 점성은 단백 농도의 증가와 더불어 급상승하여 다른 actomyosin의 그것과 비숫한 경향을 보였다. 그리고, ATP-sensitivity는 $147\~176$이었고, PH영향하에서 ATPase activity는 산성측이 6,0부근, 알칼리성측이 9.5부근이었으므로 ATPase activating site가 산, 알칼리 양측에 있음을 알았다.

• 한국식품과학회지
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• 제25권1호
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• pp.83-85
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• 1993

밤을 $0.15{\sim}0.45\;kGy$ 범위의 감마선으로 처리하고 이로부터 분리한 전분의 성질을 조사하였다. 감마선 처리에 따라 전분의 물결합 능력은 다소 증가되었고, 고유점도와 아밀로그래프 점도는 일정하게 감소되었다(r=-0.950). 그러나 전분의 팽윤력, blue value 및 광투과도는 발아억제 선량범위에서 변화되지 않았다.

• 한국식생활문화학회지
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• 제10권5호
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• pp.443-448
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• 1995

Korean fresh elephant-foot (Amorphophalus konjak K. Koch) and its powder were analyzed and compared with foreign samples to investigate the physico-chemical characteristics of Korean konjak. The Korean fresh konjak contained 80.6% of moisture content and most of the solid component comprises much of sugar, protein and trace of fat and fibre. The mannan content of Korean konjak powder is far smaller than those of Japanese and Chinese konjak powder. The analysis of the Korean konjak revealed that glutamic acid, aspartic acid and arginine included 45% of total amount, and other amino acid was incresaed with the order of valine, serine, leucine and glycine. The Korean konjak contained a moderate amount of K component and other inorganic component was larger with the order of P, Na and Ca. The yield of refined powder obtained from dried chip of Konjak was 61.0% in Korean one and 57.5% in Chinese one. The degree of lightness of Chinese konjak powder was slightly higher than that of Korean product, but the difference could not be recognized by naked eye.

• 미생물학회지
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• 제15권2호
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• pp.85-92
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• 1977

We have in vestigated on physico-chemical and biological test of plastic transfusion set which was manufactured from the three companies after $Co^{60}\;{\gamma}-radiation$. The results obtained were as follows ; 1) In physico-chemical test generally showed a tendency to decrease of pH and tensile strength, and increase of oxidizable matter, phosphoric acid-phosphosphate and heavy metals in its eluted solution by irradiation of 2,5 Mrad. 2) In biological test including toxicity and safety test were passed but indicating haemolysis range the haemolysis test were failed to pass from 30% to 50%. 3) We have found that the raw materials of plastic transfusion set according to manufactures are all different and especially the most radioresistant raw material wss found in the product which was manufactured from C company.

• 한국연초학회지
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• 제17권2호
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• pp.103-108
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• 1995

Antibiotic and physico-chemical properties of an active compound from actinomycetes isolate G-37, of which the culture filtrate had an inhibitory effect against tobacco mosaic virus(W) infection, were examined. The active compound, which was purified by ethylacetate extraction, silica gel column chromatography, preparative thin layer chromatography, and high performance liquid chromatography, showed strong antibacterial activities especially against Gram-positive bacteria including Bacillus subtillis, Sarcina lutea and Staphylococcus aureus. From the IH-NMR, FAB/RfS, UV spectral data, and physicochemical properties, the active compound of G-37 appears to belong to a peptide antibiotic group. Among the known peptide antibiotics in the antibiotic group, No. 280, A-30912, and Taitomycin showed molecular weights and ultra violet spectrum similar to those of the active compound from G-37, but was not identical to the compound, which suggests that it may be a new peptide antibiotics.

• 한국축산식품학회지
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• 제25권2호
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• pp.226-231
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• 2005

This study was carried out to find the physico-chemical attributes of yogurt base with Lactobacillus case; 00692 during 72 hr fermentation at $37^{\circ}C$. The pH decreased up to 44 hr and plateaued thereafter, and the titratable acidity increased up to 40 hr. The number of lactic acid bacteria sharply increased with $1.0\times10^7cfu/mL$ up to 48 hr of fermentation and slowly increased thereafter. The free amino acids produced during the fermentation reached the maximum value at 40 hr and gradually decreased thereafter. In the result of electrophoresis, the band was the thickest at 44 hr and mostly disappeared at 72 hr fermentation. The present data showed that the range of optimum fermentation time for yogurt base using Lactobacillus casei 00692 was from 40 to 44 hr.