• Advances in environmental research
• /
• 제3권2호
• /
• pp.163-172
• /
• 2014

Magnetite was chosen as a typical adsorbent to study its phosphate adsorption capacity in water body with low concentration of phosphorus (below $2mg\;PL^{-1}$). Magnetite was collected from Luoyang City, Henan Province, China. In this research, three factors have been studied to describe the adsorption of phosphate on magnetite, which was solution concentration (concentration ranging from 0.1 to $2.5mg\;PL^{-1}$), suspension pH (1 to 13) and temperature (ranging from $10^{\circ}C$ to $40^{\circ}C$). In addition, the modified samples had been characterized with XRD and FE-SEM image. The results show that iron ions contains in magnetite were the main factors of phosphorus removal. The behavior of phosphorus adsorption to substrates could be fitted to both Langmuir and Freundlich isothermal adsorption equations in the low concentration phosphorus water. The theoretical saturated adsorption quantity of magnetite is 0.158 mg/g. pH has great influence on the phosphorus removal of magnetite ore by adsorption. And pH of 3 can receive the best results. While temperature has little effect on it. Magnetite was greatly effective for phosphorus removal in the column experiments, which is a more practical reflection of phosphorous removal combing the adsorption isotherm model and the breakthrough curves. According to the analysis of heavy metals release, the release of heavy metals was very low, they didn't produce the secondary pollution. The mechanism of uptake phosphate is in virtue of chemisorption between phosphate and ferric ion released by magnetite oxidation. The combined investigation of the magnetite showed that it was better substrate for water body with low concentration of phosphorus.

• 한국식품과학회지
• /
• 제48권6호
• /
• pp.565-568
• /
• 2016

고온에서 가열 살균한 쇠고기의 복합인산염 전처리 유무에 따른 조직 경화 개선 효과를 고기 보수력 증가 측면에서 고찰한 결과 고기 중량 대비 0.35% (w/w) 복합인산염을 갈비살 및 우둔살에 각각 1시간 혼합, 방치한 후 $100^{\circ}C$에서 5-40분간 가열시 무처리구 대비 보수력의 간접 지표인 중량 기반 수율이 5-10% 내외 향상되는 것으로 나타났다. $115^{\circ}C$에서 30분간 가열 살균한 쇠고기에 대한 0.35% (w/w) 복합인산염 1시간 염지 및 $100^{\circ}C$, 2분 조건의 블렌칭 공정 조합 전처리 효과를 무처리구와 비교한 결과 텍스처 개선 효과가 유의차(p<0.05) 있게 나타났다. 전처리 우둔살 및 갈비살의 기계적 질김 강도가 각각 1.3, $1.4kg_f$로서 무처리구의 2.0, $1.8kg_f$에 비해 36, 19% 텍스처 질김 정도가 개선되었다. 전처리 후 가열 살균한 쇠고기에 대한 저장시 질긴 텍스처 변화를 $10^{\circ}C$, 30일 보관 후 기계적 질김 강도 비교를 통해 고찰한 결과 갈비살 및 사태살에서 무처리구 $1.7kg_f$에 비해 $1.1kg_f$의 값을 보여 평균 35% 내외의 질긴 텍스처 개선 효과가 유의차 있게 나타났다(p<0.05).

• Journal of the Korean Wood Science and Technology
• /
• 제28권1호
• /
• pp.55-64
• /
• 2000

본 연구는 표고의 톱밥재배시 재배배지의 숙도, 자실체 발생단계 및 버섯생산 수량을 정량화하고 예측하고자 실시하였다. 배지의 성숙도는 자실체 발생시기를 결정하는데 매우 유용한 지표로서, 균주, 영양생장기간, 여러 가지 효소의 활성이 관여하며, 배지내의 성분변화, pH 변화 및 수분포텐셜 등이 영향한다. 자실체발생 초기에 배지내의 glucosamine 의 함량이 최고치를 나타냈으며, 자실체 발생후 신속히 감소하였다. lipid phosphate 및 ergosterol 함량도 버섯원기 형성 시에 높은 값을 보였으며, 자실체 발생직전 최고값에 달하였다. 따라서 lipid phosphate 및 ergosterol 함량이 배지의 숙도 및 자실체형성을 예측하는 주요수단으로 사용될 수 있다. 기질내의 pH는 종균접종전 6.3으로부터 자실체형성단계에서 4.0으로 변화하였으며, pH측정으로 자실체수량을 예측할 수 있었는데, 이러한 pH를 bromphenol blue(BPB)의 스프레이로 간단히 측정할 수 있었다. 아울러 기질의 수분포텐셜과 관련하여, -0.5MPa 정도의 수분포텐셜감소가 생장 및 자실체형성에 크게 영향하였으며, 우수한 숙도외 버섯재배 기질이 가지는 수분포텐셜은 버섯발생 전후 각각 -0.7MPa, -4.0MPa 였다. 높은 수분포텐셜은 고밀도의 균체콜로니를 만들 수 있었으며 균주 및 배양기간중의 상호작용이 기질의 수분포텐셜에 현저히 영향하였다.

• 한국축산식품학회지
• /
• 제38권2호
• /
• pp.273-281
• /
• 2018

Preheating conditions (low-, medium-, and high heat-) did not significantly affect the buffering capacity (BC) of skim milk powder (SMP), whereas the level of demineralization significantly affected the BC of whey powders (WP). Heat treatment ($85^{\circ}C$ for 30 min) of both SMP and WP (90% demineralized) mixtures (88:12, 76:24, 64:36 and 52:48; SMP:WP) resulted in a reduced BC, and the extent of this reduction increased with the proportion of WP increased in the samples. High-buffering milk prepared by the addition of phosphate salts (40 mM $NaH_2PO_4$ and 60 mM $Na_2HPO_4$) delayed the rate of pH decline during yoghurt fermentation. The high-buffering yoghurt showed a significantly higher water holding capacity (WHC) than that of control yoghurt (p<0.05), as well as a more uniform and interconnected microstructure with small pore sizes than those of control yoghurt. No significant differences were found between high-buffering and control yoghurt regarding the viable bacterial counts of starter. The manipulation BC can potentially improve the quality characteristics of yoghurts, such as WHC and texture.

• 한국환경과학회지
• /
• 제9권5호
• /
• pp.365-368
• /
• 2000

The antibacterial effect amino acid-copper(II) surfactant on fish pathogens was studied. Fish pathogens of Edwardsiella tarda Vibrio anguillarum Aeromonas hydrophila and Streptococcus sp. were selected cultured in nutrient agar and adjusted at $2{\times}10^5~10^6 CFU/$m\ell$$ in phosphate buffer saline before the addtion of amino acid-copper(II) surfactant with different concentrations. All tested pathogens died within 1 hour with 1 ppm of amino acid-copper(II) surfactant. In comparison with formalin and ET. amino acid-copper (II) surfactnat was more effective in antibacterial capacity.

• 한국동물학회:학술대회논문집
• /
• 한국동물학회 2000년도 한국생물과학협회 학술발표대회
• /
• pp.226.3-227
• /
• 2000

No Abstract, See Full Text

• Journal of Pharmaceutical Investigation
• /
• 제6권1호
• /
• pp.14-17
• /
• 1976

Binding of nalidixic acid with plasma of male and female rats, dogs, and rabbits was studied in vitro using the method of equilibrium dialysis in 1/15 mole phosphate buffer (pH 7.4). Rat plasma had the most extensive binding capacity followed by dog and rabbit plasma, and the plasma of female had more extensive capability than male in rat and rabbit but it was reversed in dog.

• 한국물환경학회지
• /
• 제23권6호
• /
• pp.966-972
• /
• 2007

A novel organoclay has been developed with aluminium-pillared clay modified with an amphoteric surfactant, N-Dodecyl-N,N-dimethyl-3-ammonio-1-propanesulfonate (DDAPS). This novel organoclay is expected to have phosphorus removal capacity as well as organic and inorganic contaminant removal capacity, due to aluminum inside the clay structure. It also exhibited less surfactant desorption than conventional cation surfactant-based organoclays. Phosphorus in water can be decreased from 0.2 mg/L to 0.0012 mg/L in 27 hours with this organoclay. Also, cadmium could removed from water using this proposed organo-clay. Experiments were performed under various pHs and amphoteric surfactants sorption capability was the highest at pH 5 when more of the amphoteric surfactant head group took on positive charges.

• Bulletin of the Korean Chemical Society
• /
• 제25권6호
• /
• pp.791-795
• /
• 2004

The binding of cethyl trimethylammonium bromide, (CTAB) with human serum albumin (HSA) has been investigated at 5 mM phosphate buffer pH 7.0, 27 $^{\circ}C$ and various ionic strength using ion selective membrane electrodes. This method is faster and much more accurate than equilibrium dialysis technique, so provides sufficient and accurate data for binding data analysis. A novel and simple method was introduced for resolution and characterization of binding sets on basis of binding capacity concept. The values of Hill binding parameters were estimated for each set and used for calculation of intrinsic binding affinity. The results interpreted on basis of nature of forces which interfered in the interaction and represent the existence of three and two binding sets for binding of CTAB at $10^{-4}$ and $10^{-3}$ M of NaBr, respectively.

• 한국광물학회지
• /
• 제21권2호
• /
• pp.117-127
• /
• 2008

카올리나이트 KGa-2 (표준 점토)의 인산염 흡착-탈착 특성을 규명하기 위하여 벳치(batch) 흡착 실험을 실시하였으며, 흡착 상태를 알아보기 위하여 ATR-FTIR (Attenuated Total Reflectance-Fourier Transform Infrared) 분광분석을 실시하였다. 인의 함량은 UV-VIS-IR 분광분석 기를 사용하여 측정하였으며, 이 때 파장은 820 nm를 이용하였다. pH 4에서 pH 9 범위 내에서 카올리나이트 KGa-2의 인산염 흡착량은 pH가 증가하면 대체적으로 증가하는 경향을 나타내지만, 인산염 농도에 따라 매우 다른 형태를 보여준다. 카올리나이트 KGa-2의 인산염 흡착 특성은 랑미어 흡착등온선, 템킨 흡착등온선, 프로인드리히 흡착등온선 순으로 잘 부합하며, 랑미어 최대 흡착능은 $204.1{\sim}256.5\;mg/kg$, 평균간은 232.5 mg/kg으로서, 카올리나이트 KGa-1b에 비하여 높은 인산염 흡착능을 가진다. 카올리나이트에 흡착된 대부분의 인산염이 탈착되기보다, 광물 내에 고착되는 경향을 나타내지만 이에 대해서는 후속적인 실험이 필요한 것으로 판단된다. ATR${\sim}$FTIR 스펙트럼에서 카올리나이트에 의한 흡수피크의 위치가 인 피크와 거의 중첩되고, 카올리나이트에 의한 흡수 피크의 강도가 인 피크에 비하여 월등히 크기 때문에 카올리나이트에 흡착된 인에 의한 피크를 카올리나이트 자체에 의한 피크로부터 분리하는 것이 거의 불가능하였다.