• Journal of Pharmaceutical Investigation
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• 제25권3호
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• pp.223-226
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• 1995

A new method to study water uptake into biodegradable polymer was developed. Polymer was gently mixed with the tritiated buffer and the radioactivity level of the polymer due to water uptake was measured by liquid scintillation counting. The rate of water uptake was estimated from the plot of the amount of water in the device as a function of time. The technique used in this study is particularly useful for estimating water uptake of biodegradable polymers which were difficult to study by other techniques such as weight gain used for hydrogel.

• 한국작물학회지
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• 제44권3호
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• pp.288-295
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• 1999

Nineteen japonica and Tongil-type rices were selected from seventy nine Korean and Japanese rice cultivars grown in 1989 based on the water uptake behavior of milled rice under the room temperature and boiling conditions. The selected rice cultivars were investigated for water absorbability and some physicochemical characteristics of milled rice, proper water amount for cooking and sensory evaluation of cooked rice. The relationships among the tested grain properties were also examined. The highest varietal variation of water uptake rate was observed at twenty minutes after soaking in water. The maximum water uptake of milled rices at room temperature occurred mostly at about eighty minutes after soaking in water. Newly harvested rices showed a significantly lower water uptake rate of milled rice at 20 minutes after soaking, a relatively higher maximum water absorption ratio under the room temperature, and the less water uptake and volume expansion of boiled rice compared with the one-year old rice samples. The water uptake rate and the maximum water absorption ratio showed significantly negative correlations with the K/Mg ratio and alkali digestion value(ADV) of milled rice. The rice materials showing the higher amount of hot water absorption exhibited the larger volume expansion of cooked rice. The harder rices with lower moisture content revealed the higher rate of water uptake at twenty minutes after soaking and the higher ratio of maximum water uptake under the room temperature condition. These water uptake characteristics were not associated with the protein and amylose contents of milled rice ansd the palatability of cooked rice. The water/rice ratio(in w/w basis) for optimum cooking was averaged to 1.52 in dry milled rices (12% wet basis) with varietal range from 1.45 to 1.61 and the expansion ratio of milled rice after proper boiling was averaged to 2.63(in v/v basis). The water amount needed for optimum cooking was the lowest in Cheongcheongbyeo (Tongil-type rice) and the highest in Jinbubyeo, and the amount could be estimated with about 70% fittness by the multiple regression formula based on some water uptake characteristics, ADV and amylose content of milled rice as the independent variables. Nineteen rice cultivars were classified into seven groups based on scatter diagram projected by principal component analysis using eight properties related to water uptake and gelatinization of milled rice.

• 한국작물학회지
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• 제41권1호
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• pp.95-102
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• 1996

변화하는 환경조건에서 종자의 장기간 저장시발아율, 용출정도 및 수분흡수율을 밝혀서 장기저장 가능한 품종의 선발기준과 그의 특성을 알아보기 위하여 본 실험을 실시하였던 바, 다음과 같은 결과를 얻었다. 1. 콩나물재배기와 petri dish에서의 발아율은 20개월 저장시 품종간의 차이가 컸으며, 8개월 저장에서도 차이가 있었다. 2. 배축의 길이와 두께는 저장기간 간에 유의한 차이가 있었다. 3. 용출정도는 20개월 저장에서 팔달콩과 풀무원이 SS88038계통보다 2배 정도 높았다. 4. 초기 30분의 수분흡수율은 20개월 저장에서는 품종간 차이가 있었으며, 8개월 저장에서는 팔달콩과 풀무원이 SS88038보다 1.5배와 2배 빨랐다. 5. 발아율과 용출정도는 20개월 저장에서 고도로 유의한 부의 상관을 나타내었고, 100립중은 발아율 및 용출정도와 상관이 없었다. 6. 수분흡수율과 용출정도는 8개월 저장에서 침종 30분과 1시간에서 고도로 유의한 정의 상관을 나타내었고, 20개월 저장에서는 침종 30분, 1시간, 3시간에서 고도로 유의한 정의 상관을 나타내었으며, 주공의 열림과 수분흡술율은 상관이 없었다.

• Applied Biological Chemistry
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• 제33권3호
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• pp.261-263
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• 1990

The water uptake rates of thirty-four japonica and twenty-five j x indica brown rices at $100^{\circ}C$ were analyzed. The water uptake rates had no correlation with size or volume of brown rice kernel. The regression equations for water uptake rates between brown rice at $100^{\circ}C$(Y) and milled rice at $23^{\circ}C(X)$ for japonica and j x indica varieties were Y = 1.12X-0.34(r = 0.976, p<0.001) and Y = 1.16X-0.54(r = 0.990, p<0.001), respectively (Received August 13, 1990 and accepted September 20,1990).

• 한국물환경학회지
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• 제26권3호
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• pp.468-473
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• 2010

The purpose of this study is to derive the correlation between the Specific Phosphorus Release Rate (SPRR), Specific Phosphorus Uptake Rate (SPUR) and Specific Oxygen Uptake Rate (SOUR) at various Sludge Retention Time (SRT) condition in the A/O process. The laboratory scale reactor was operated on various SRT (10 day, 20 day, 30 day, 40 day). In this study, the SPRR, SPUR and SOUR tended to decrease with the SRT increase. Empirical equations was be obtained $y=4.54E-006x^2+0.0007x-0.0315$, $R^2=0.925$ (SOUR vs. SPRR) and $y=3.22E-006x^2+0.0004x-0.0173$, $R^2=0.928$ (SOUR vs. SPUR) from the relationship between SRT, SPRR and SPUR and SOUR. Therefore, the anaerobic tank design based on the research result such as SPRR, SPUR of a phosphorus design and SOUR would be possible.

• 한국환경생물학회:학술대회논문집
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• 한국환경생물학회 2002년도 춘계공동학술대회 및 심포지움 초록집
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• pp.19-19
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• 2002

• 한국패류학회지
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• 제21권1호
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• pp.41-46
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• 2005

A series of radiotracer studies were conducted to evaluate the influence of water temperature and/or body size on the clearance rates and uptake rates of Cd, Se and Zn in the Asiatic clam, Corbicula fluminea, Asian clam Potamocorbula amurensis and Balthic clam, Macoma balthica. Uptake rates of Cd, Se and Zn were estimated simultaneously with clearance rate of clams under 3 different water temperature conditions (5, 13 and $21^{\circ}C$). The weight specific clearance and metal uptake rates of P. amurensiswere increased with temperature, however, no consistent temperature effect was observed for the other clams. The variation of uptake rates of Cd, Se and Zn along with temperature or body size in each clam species was well associated with clearance rates. The inter-species as well as the intra-species difference of metal uptake rates could be well explained by the variation of clearance rates of clam individuals.

• 한국해양학회지:바다
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• 제18권2호
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• pp.80-88
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• 2013

본 연구에서는 두 개의 크기집단의 바지락(Ruditapes philippinarum), 재첩(Corbicula japonica), 홍합(Mytilus edulis)을 세 개의 수온 조건(5, 13 그리고 $18^{\circ}C$)에서 용존 노닐페놀에 노출시킴으로써 개체 크기와 수온 변화가 여수율과 용존 노닐페놀 흡수율에 미치는 영향을 조사하였다. 이를 통해 이매패류의 여수율과 유기화합물질 흡수과정의 관련성에 대해 평가하고자 하였다. 단위무게당 여수율($CR_{wt}$)은 모든 개체 크기와 온도 범위에서 홍합(0.3-4.9 L $g^{-1}\;h^{-1}$)이 가장 높았으며, 재첩(0.44-1.98 L $g^{-1}\;h^{-1}$), 바지락(0.08-0.6 L $g^{-1}\;h^{-1}$) 순으로 나타났다. 한편 단위무게당 노닐페놀의 흡수율은 종 간 뚜렷한 차이를 보이지 않았다. 단위무게당 여수율과 노닐페놀 흡수율은 일반적으로 개체의 크기가 증가함에 따라 감소하고, 온도가 증가함에 따라 증가하는 경향을 보였다. 세 종 모두에서 노닐페놀 흡수율은 여수율과 높은 상관관계를 보였다. 한편 노닐페놀 흡수율은 같은 여수율 범위에서 홍합, 재첩, 바지락 순으로 증가하였다. 여수율과 노닐페놀 흡수율의 높은 상관관계로부터 여수율이 이매패류의 용존 유기화합물 흡수에 중요한 역할을 한다는 것을 추정할 수 있다.

• Applied Biological Chemistry
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• 제37권2호
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• pp.94-99
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• 1994

일반계(13품종)와 통일계(12품종) 현미의 겨층구조와 수분 흡수 속도를 조사하고 각 특성들간의 유의성을 분석하였다. 일반계 현미의 길이는 통일계보다 유의적으로 짧았으나, 폭과 무게는 유의적인 차이가 없었다. 호분층과 과피의 두께는 일반계와 통일계 모두 등부가 배부보다 두꺼웠으며, 호분층 수는 일반계가 통일계보다 많았으나 배부 또는 등부의 호분층과 과피의 두께는 일반계와 통일계 사이에 유의적인 차이가 없었다. $60^{\circ}C$ 에서의 수분 흡수 속도는 일반계가 폭이 컸으나 통일계와 유의성은 없었으며, 겨층의 구조와는 상관을 보이지 않았다.

• 대한가정학회지
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• 제26권4호
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• pp.1-13
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• 1988

The purpose of this study is to investigate water and after vapor transport characteristics of underwear fabrics. Experimental materials were cotton woven fabric and cotton knitted fabric, nylon tricot (untreated and hydrophilic finished) and cotton/polyester/cotton triple layer. Cotton knitted fabric have three types of knit structure (interlock, rib, plain stitch) and knit with either 38's or 60's combed yarn. And cotton woven fabric have plain weave with 60's combed yarn. As experimental methods, vapor cup test, dynamic method, vertical wicking test and transplanar uptake test were used. The results are as follows. 1) In cotton specimens, the order of water vapor transpiration (wvt) was plain > rib > interlock in the same yarn diameter. The knit fabric of thinner yarn showed the better wvt among the same knit structure. 2) In cotton specimens, the order of water absorbency was interlock > rib > plain in the same yarn diameter. the knit fabric of thicker yarn showed the better absorbency among the same knit structure. 3) When knit fabric (60's plain) is compared with woven fabric 960's plain), knit fabric showed faster rate of wvt, more amount of uptake and slower rate of water uptake than woven fabric did. 4) When compared untreated nylon with hydrophilic finished nylon, hydrophilic finished nylon showed much more water absorbency than untreated nylon did, but showed same rate of wvt. 5) The water transport characteristics of triple layer underwear fabric showed that the thinner and the lighter one, the better wvt and absorbency did.