• Title, Summary, Keyword: Acetate

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The Determination of Turnover Rate and Pool Size of Acetate in the Goat Rumen by The Isotope Dilution Method (동위원소희석법에 의한 염소위의 Acetate 함량 및 흡수율의 측정)

  • 하두봉
    • The Korean Journal of Zoology
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    • v.3 no.1
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    • pp.24-30
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    • 1960
  • 본실험의 목적은 탄산기에 방사성동위원소 C14를 표식한 sodium acetate ($CH_3$C14 OONA)를 사용하여 염소의 위내에 존재하는 acetate 의 위벽으로부터의 흡수율과 위의 acetate의 평균함량을 측정하는데 있다. C14 로 표식된 sodium acetate(specific activity 1.35$\times$108 cpm./g.)를 급사 3 시간후의 염소의 위내에 주입하고 주입 2분후부터 약 2분간격으로 위 내용물을 추울하여 column chromatograpy를 이용하여 acetate를 분리정량한 후 그의 specific activity를 측정하였다. 주입후 3 분경까지는 위내에 존재하는 acetate에 의한 표식 acetate의 희석으로 말미암아 specific activity 는 급격히 감소되어 갔고 3 분후부터는 감소도가 비교적 완만하였으나 역시 계속적으로 감소되어갔다. 희석완료후의 이 specific activity 감소는 위벽을 통한 acetate를 흡수와 위 내용물로부터의 acetate 생성으로 인한 것으로서, 이 감소율로부터 acetate의 위벽흡수속도를 추정할 수 있다. 상기 specific activity의 감소 graph 로부터 추정된 위내 acetate의 량은 본실험의 제조건하에서 약 30 g이었으며 위내 acetate 의 specific activity가 1/2 로 감소되는데 요하는 평균 시간은 약 4 분이었다. 이는 위내에 존재하는 acetate량의 약 절반은 4 분동안에 위벽을 통과함을 의미한다.

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The Effect of Sodium Acetate in Alkaline Treatment of Acetate Fabrics (아세테이트 직물의 NaOH 처리시 무기염 첨가에 따른 영향)

  • Sung, Jong-Mi;Kim, Hye-Rim;Song, Wha-Soon
    • Fashion & Textile Research Journal
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    • v.7 no.1
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    • pp.85-90
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    • 2005
  • The effect of sodium acetate to reduce the fiber damage and hardening of acetate fabrics during alkaline treatment is studied. The optimal condition is controlled concentration 2%, at $50^{\circ}C$ for 6 minutes and at $70^{\circ}C$ for 2 minutes through the result of weight loss, shrinkage and tensile strength. Alkaline treated acetate fabrics under optimal condition show softer than untreated acetate fabrics. Alkaline treatment with sodium acetate brings the reduction in hardening and shrinkage in internal fiber of acetate fabric. Also, alkaline treatment with sodium acetate improves the tensile strength of acetate fabrics compared with only alkaline treatment. The moisture regain of acetate fabrics is also improved by alkaline treatment under optimal condition.

The Entrapment of Vitamin E Acetate in Porous Spheres (다공성 미소구체 중 초산토코페롤의 봉입에 관한 연구)

  • Yang, Yoon-Jeong;Bae, Bong-Jin;Lee, Kyu-Sik;Chun, In-Koo
    • Journal of Pharmaceutical Investigation
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    • v.21 no.1
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    • pp.51-55
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    • 1991
  • Porous spheres composed of natural waxes and inorganic materials containing vitamin E acetate as a drug were prepared by impregnation method. Furthermore, the amount of vitamin E acetate entrapped in the spheres and the release rate of vitamin E acetate from the spheres were studied. The impregnation of vitamin E acetate was carried out by dipping the spheres in vitamin E acetate solutions. Entrapment mechanism of vitamin E acetate could be expressed in terms of Langmuir's adsorption isotherm. The amount of vitamin E acetate entrapped in porous spheres was influenced by the structure and concentration of the polymer used in vitamin E acetate solutions, and the concentration of vitamin E acetate. Release characteristics of vitamin E acetate from the spheres were investigated by withdrawing samples periodically and analyzing them by spectrophotomer.

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Studies on the Effect of Biotin Vitamers as a Growth Factors in the L-Glutamic Acid Fermentation (Biotin Vitamer를 Growth Factor로 사용시 L-Glutamic Acid 발효에 미치는 영향)

  • 양한철;김혁일;성하진
    • Microbiology and Biotechnology Letters
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    • v.1 no.2
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    • pp.105-113
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    • 1973
  • The effect of biotin and biotin vitamer on the fermentative production of L-glutamic acid (L-GA) by Brevibacterium flavum was studied. And results were as follows. 1) L-GA production in the medium containing 10% Glucose was the best at the concentration of Biotin 5${\gamma}$/l, Desthiobiotin 5${\gamma}$/1, and 7,8-Diaminopelargonic acid 10${\gamma}$/1, respectively. 2) In the experiment using the Glucose-Acetate mixed media derided into four parts, considerable amounts of cell growth and L-GA production were observed in the mixed medium containing 2% Glucose-Acetate. 3) In the cases of using the media containing methanol, ethanol, ethylacetate, acetic acid (free acetate), Na-acetate:NH$_4$-acetate=2 : 1, the production of L-GA were in decreasing order as follows; Na-Acetate:NH-Acetate=2 : 1> Acetic acid (free acetate)> Ethylacetate> Ethanol> Methanol. 4) When biotin vitamers as growth factors were added in the medium containing Glucose or Acetate as the source of carbon, the substitution effect of Desthiobiotin was almost the same, 7,8-Diaminopelargonic acid 3 or 4 times stronger, and Bisnorbiotin has no substitution effect, compared with Biotin.

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Effects of Low Workfunction Metal Acetate Layers on the Electroluminescent Characteristics of Organic Light-Emitting Diodes (저일함수 금속 아세트산 화합물 층을 사용한 유기발광다이오드의 전기발광 특성 향상)

  • Kim, Mansu;Yu, Geun-Chae;Kim, Young Chul
    • Korean Chemical Engineering Research
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    • v.51 no.5
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    • pp.634-639
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    • 2013
  • We investigated the effects of a cathode underlayer on the electroluminescence (EL) characteristics of organic light-emitting diodes (OLEDs) using various metal acetates (M-acetate, M = Li, Na, K, Cs) as a cathode underlayer. When 1 nm thick M-acetate layers were used as a cathode underlayer, the OLEDs with M-acetate showed better EL performance than the device with the conventional LiF electron injection layer except the device with Cs-acetate. More enhanced current density and improved EL characteristics were obtained when lower work function metal acetate was employed. In addition, the optimum M-acetate layer thickness that gives the best device performance proved to be 0.7 and 2.0 nm for Li-acetate and Cs-acetate, respectively, probably depending on the molecular size of M-acetate. The OLEDs with the M-acetate layers of optimized thickness demonstrated more than 60% enhanced current efficiency compared with that of the device using an LiF layer at the same applied voltage.

Effect of Sodium Acetate on the Production of Sisomicin by Micromonospora inyoensis (Micromonospora inyoensis에 의한 Sisomicin 생산에서 Sodium Acetate의 영향)

  • 최신원;유연우
    • Microbiology and Biotechnology Letters
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    • v.23 no.5
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    • pp.519-525
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    • 1995
  • This study was carried out to enhance the production of sisomicin by Micromonospora inyoensis ATCC 276000. The effect of various sugars and organic acids as the supplements to a basal mineral medium was tested for the sisomicin production by fully grown mycelium. Among the substances tested, acetate and citrate greatly increased the production of sisomicin at the sixth day of culture. Especially, in the basal mineral medium containing 0.1M sodium acetate, sisomicin production was 6.7 times more than that in the same medium with glucose. When 0.1M sodium acetate was added in the fermentation medium initially, the cell growth was inhibited by sodium acetate, although specific productivity was higher than that in the same medium without sodium acetate. On the contrary, when sodium acetate was added to the culture after three days, the sisomicin production and specific productivity were 1.6 times higher than those in the same medium without sodium acetate. The results suggested that sodium acetate was a stimulating substance of sisomicin production by M. inyoensis.

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Selection of Organic Carbon (Different Form of Acetate Compounds and Concentration) for Cultivation of Anabena under Mixotrophic Cultivation Mode (혼합영양 배양조건에서의 Anabena 배양을 위한 유기탄소(acetate 종류 및 농도) 선정 연구)

  • Hong, Kai;Gao, Siyuan;Lee, Taeyoon
    • Korean Chemical Engineering Research
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    • v.56 no.1
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    • pp.73-78
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    • 2018
  • The main objective of this study was to evaluate the effects of acetate on the cultivation of anabena under mixotrophic condition. Four different types of acetates were used for the anebena cultivation. Among them, ethyl acetate was found to be the most effective and the growth rates linearly increased as the amount of ethyl acetate increased. When 40 mM of ethyl acetate was used, the highest values of specific growth rate of $0.979day^{-1}$ and maximum biomass productivity of $0.293g\;L^{-1}\;d^{-1}$ were obtained. On the contrary, input of acetic acid and butyl acetate inhibited the growth of anabena. For aeration tests, 0.54 vvm was optimum for anabena cultivation. For a semi-continuous cultivation test, ethyl acetate was used after 0.54 vvm test was finished. Then, test continued under 0.54 vvm and 40 mM of ethyl acetate. Lower specific growth rate and maximum biomass productivity were obtained compared to those from batch cultivation tests. However, the greatest maximum concentration of 5.91 g/L was obtained during the semi-continuous cultivation test.

Acetate Consumption Activity Directly Determines the Level of Acetate Accumulation During Escherichia coli W3110 Growth

  • Shin, Soo-An;Chang, Dong-Eun;Pan, Jae-Gu
    • Journal of Microbiology and Biotechnology
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    • v.19 no.10
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    • pp.1127-1134
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    • 2009
  • Escherichia coli excretes acetate during aerobic growth on glycolytic carbon sources, which has been explained as an overflow metabolism when the carbon flux into the cell exceeds the capacity of central metabolic pathways. Nonacetogenic growth of E. coli on gluconeogenic carbon sources like succinate or in carbon-limited slow growth conditions is believed an evidence for the explanation. However, we found that a strain defected in the acs (acetyl Co-A synthetase) gene, the product of which is involved in scavenging acetate, accumulated acetate even in succinate medium and in carbon-limited low growth rate condition, where as its isogenic parental strain did not. The acs promoter was inducible in noncatabolite repression condition, whereas the expression of the ackA-pta operon encoding acetate kinase and phosphotransacetylase for acetate synthesis was constitutive. Results in this study suggest that E. coli excretes and scavenges acetate simultaneously in the carbon-limited low growth condition and in nonacetogenic carbon source, and the activity of the acetate consumption pathway directly affects the accumulation level of acetate in the culture broth.

Analysis of Migration Properties and Color Fastness of Disperse Dyes on Acetate, Tri-Acetate, PET and Mixture Fabrics (Acetate, Tri-Acetate, PET 및 복합소재에 대한 염색성 및 물성분석)

  • Kim, Gyeong-Mi;Woo, Jong-Hyeong;Chung, Yean-Kyu
    • Proceedings of the Korean Society of Dyers and Finishers Conference
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    • pp.51-51
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    • 2011
  • Acetate 섬유는 고감성 제품의 대표적 핵심소재로서 실크와 같은 우아한 광택과 청량감을 주어 고가의 의류제품으로 사용되지만 편직 및 염색가공 공정이 까다롭고 비교적 저분자량의 분산염료로 염색되어 내열성, 염색견뢰도 및 물에 대한 형태안정성이 떨어진다. 특히, Acetate 편직물은 이태리나 일본 등 섬유선진국에서도 제조가 까다로운 기술적 난이도가 매우 높은 제품군이다. 반면 Tri-Acetate는 Acetate의 장점을 가지면서 내열성, 내세탁성, 원상회복력(resilience)등이 우수하여 기존 Acetate 시장의 고급제품 용도로의 전개가 가능할 뿐만 아니라 PET 등의 물성 및 형태가 다른 복수의 소재성분을 직물 사이에 공존시킴으로써 새로운 태, 기능, 외관, 광택의 부여가 가능하며 이를 활용한 차별화된 고부가가치 시장의 창출이 기대된다. Acetate와 Tri-Acetate 모두 셀룰로오스의 친수기가 아세틸화된 구조를 가지는 소수성 섬유로 분자구조가 치밀하여 분산염료로 염색된다. 그러나 일반적으로 Acetate 섬유의 경우 Acetate용 일반분산염료를 사용하여 저온상압염색을 하는 반면, Tri-Acetate의 경우 고온고압 분산염료를 사용하여 고온고압염색을 한다. PET와 Tri-Acetate 복합소재의 경우, 두 소재의 염색거동이 비슷하여 고온고압 분산염료로 염색이 가능하지만 T/P 복합소재에 상응하는 염색을 위해서는 복합소재를 구성하는 각각의 섬유소재에 적합한 염료의 선정 및 염색법의 개발이 필요하다. 본 연구에서는 Tri-Acetate 및 T/P 복합소재에 대한 염색최적조건을 규명하고자 염색온도별, 2종의 분산염료의 농도별 염색성, 염색시료의 인열강도 및 견뢰도를 측정하여 적정조건을 도출하였다.

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Studies on Synthesis of Acrylic Water Borne Polymer;Synthesis of Poly(vinyl acetate) and Poly(vinyl acetate-co-2-ethylhexyl acrylate) (Aerylic Water Borne Polymer의 합성 연구;Poly(vinyl acetate)와 poly(vinyl acetate-co-2-ethylhexyl acrylate)의 합성 연구)

  • Kim, Sang-Hern
    • Journal of the Korean Applied Science and Technology
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    • v.13 no.2
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    • pp.77-84
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    • 1996
  • Poly(vinyl acetate)와 poly(vinyl acetate-co-2-ethylhexyl acrylate)를 여러 조건에서 semicontinuous emulsion 중합으로 합성하였다. Overall conversion, emulsion 입자크기, pH, 점도 등을 합성한 두 emulsion polymer에 대해 측정하였다. Vinyl acetate monomer에 2-ethylhexyl acrylate를 도입함으로서 emulsion 입도, 점도, 중합 속도, 유리 전이 속도가 감소함을 확인하였다.