• Title/Summary/Keyword: W/O/W

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Crystal Structure of Pentapotassium Disodium Hexatungstoantimonate(V) Dodecahydrate, $K_5Na_2[SbW_6O_{24}]\cdot12H_2O$

  • Lee, Uk;Sasaki, Yukiyoshi
    • Bulletin of the Korean Chemical Society
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    • v.8 no.1
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    • pp.1-3
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    • 1987
  • The crystal structure of $K_5Na_2[SbW_6O_{24}]{\cdot}12H_2O$ has been determined. Final R = 0.081 for 890 observed independent reflections collected by diffractometry. Crystal data as follows; trigonal, space group R3m, a = 9.794(1) ${\AA},\;{\alpha}$ = 84.72$(1)^{\circ}$, Z = 1. The heteropolyanion has a structure with point symmetry $D_{3d}$ (3m), of the ideal Anderson-type heteropolyanion. The Sb-W and W-W distances are 3.259(2) and 3.259(3) ${\AA}$. Three types of W-O ($W-O_t,\;W-O_b\;and\;W-O_c$) distances are 1.73(2), 1.95(4) and 2.20(3) ${\AA}$. The Sb-O distance is 1.97(3) ${\AA}$.

Effect of the Addition of Polyvinylpyrrolidone on In Vitro Development and Cell Number of Porcine Embryo after In Vitro Fertilizatin (Polyvinylpyrrolidone 첨가가 돼지 체외 수정란의 발달과 세포수에 미치는 영향)

  • Park Y.S.;Kim J.Y.;Park H.D.
    • Journal of Embryo Transfer
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    • v.21 no.2
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    • pp.121-128
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    • 2006
  • In this study, we examined the effects of molecular weight, concentrations and treat the duration of polyvinylpyrrolidone (PVP) in vitro maturation (IVM) medium (Experiment 1), and the effect of PVP in IVM, in vitro fertilization (IVF) and in vitro culture (IVC) medium on the development and cell number of porcine embryos (Experiment 2). The base mediums were NCSU 23 solution for IVM, mTBM solution for IVF and PZM3 solution for IVC. In experiment 1, the development rates to 2 cell and blastocyst stage were not differ from the different molecular weight (MW), concentration and duration of PVP in IVM medium. However, the hatching rate of blastocyst was significantly higher in the group of MW 40,000, 0.5% and $0{\sim}44hr$ than in the other groups (p<0.05). In experiment 2, the results of IVM, IVF and IVC medium with (W) or without (W/O) 0.5% MW 40,000 PVP are follows. The development rate to 2 cell stage was highest in the group of W-W/O-W (p<0.05). The development rate to blastocyst and hatching rate was higher in the group of W-W/O-W and W-W/O-W/O than that of other treatments (p<0.05).

Flavonoid Analysis from the Leaves of Eucommia ulmoides (두충나무잎의 생리활성 Flavonoid 분석)

  • 박종철;김성환
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.24 no.6
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    • pp.901-905
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    • 1995
  • Three flavonoid compounds, astragalin(1), isoquercitrin(2) and quercetin $3-O-{\beta}-D-xylopyranosyl(1-2)-{\beta}-D-glucopyranoside(3)$ isolated from the leaves of Eucommia ulmoides were identified and quantified by HPLC. All flavonoids were well separated on a ${\mu}-Bondapak\;C_{18}$ column with a mobile phase composed of THF-dioxane-MeOH-HOAc-5% $H_3PO_4-H_2O$(145 : 125 : 50 : 20 : 2 : 658). The contents of compound 1 in the methanol extract and n-butanol fraction were 0.09%(w/w) and 0.46%(w/w), of compound 2 were 0.08%(w/w) and 0.48%(w/w), and of compound 3 were 0.40%(w/w) and 1.22%(w/w), respectively.

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The effect and stability of Retinyl Palmitate(RP) in W/O, W/S, O/W, MLV(Multilamellar Vesicles) cream (W/O, W/S, O/W, MLV(Multilamellar Vesicles) TYPE에서 Retinyl Palmitate(RP)의 열적 안정성과 효능, 효과에 관한 연구)

  • 지홍근;서봉석
    • Journal of the Society of Cosmetic Scientists of Korea
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    • v.22 no.1
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    • pp.40-59
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    • 1996
  • Retinyl Palmitate, the skin normalzer, is useful to promote greater skin elasticity, to diminish lipid peroxidation and skin roughness following UV exposure, and promote a youthfull general skin appearance. We knew that the reduction of retinyl palmitate in W/O, W/S, O/W, MLV cream was caused by variable compound factors. Among the retinoids, we chose retinyl palmitate and studied the stability behavior of retinyl palmitate is liposomed. Furthermore, HPLC, CHROMA METERS, LASER SIGHT SCATTERING SYSTEM and FREEZE FRACTURE SCANNING ELECTROM MICROSCOPY was used to analyzing the stability and efficacy of UV and heat.

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Characteristics of Non-ionic Micellar and O/W Microemulsion Systems and Solubilization of Sudan IV (비이온성 미셀용액과 수중유형 마이크로에멀젼계의 특성 및 수단 IV의 가용화)

  • 지웅길;황성주;장은옥;현종목
    • YAKHAK HOEJI
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    • v.39 no.5
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    • pp.495-505
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    • 1995
  • The O/W microemulsion systems were made from 2 or 4% (w/w) oil (soybean oil, olive oil or isopropyl myristate) and 10, 15 or 20% (w/w) Brij 96. They were compared with micellar solution of equivalent surfactant concentration m therms of physicochemical properties, and the solubilization of sudan IV. They were characterized by dynamic light scattering, stability, surface tension, viscosity and rheogram. The mean diameters of O/W microemulsion systems were 10-15nm, and those of Brij 96 micellar solutions were 18-19 nm. Both of them were monodisperse systems. The O/W microemulsion systems showed Newtonian flow and their apparent viscosities were lower than those of micellar solutions. The surface tensions of O/W microemulsion systems were increased or decreased depending on the types of oil used, when compared with those of micellar solutions. The O/W microemulsion systems were very stable, and did not show any flocculation or aggregation. Their mean diameters were not changed after three months. But oxidation was observed in microemulsions without nitrogen gas at high temperature. There was a significant improvement in the sudan IV solubffimtion in micromulsion compared with that m the micellar solution containing equivalent concentration of surfactant. The size distribution and mean diameters of O/W micromulsions were not changed when sudan IV was solubilized.

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Konzeption $f\"{u}r$ das Koreanisch-Deutsche/ Deutsch - Koreanische $W\"{o}rterbuch\;-\;W\"{o}rterbuchprojekt\;an\;der\;Universit\"{a}t$ Bonn - (주제별 분류사전 편찬기술방법 연구 - 독일 Bonn 대학교 한국어 번역학과 한독/독한 사전 편찬사업을 중심으로)

  • Lee Hae-Wook
    • Koreanishche Zeitschrift fur Deutsche Sprachwissenschaft
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    • v.4
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    • pp.395-411
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    • 2001
  • Die $W\"{o}rterb\"{u}cher$ spielen beim Erwerb einer Sprache eine wesentliche Rolle. Es gibt inzwischen mehrere Deutsch-Koreanische $W\"{o}rterb\"{u}cher$. Die Lage $f\"{u}r$ die Koreanisch-Deutschen $W\"{o}rterb\"{u}cher$ ist aber verbesserungs- $bed\"{u}rftig$. Stellvertretend $f\"{u}r$ das Koreanisch/Deutsche $W\"{o}rterbuch$ steht das 1981 von der Koreanischen Gesellschaft $f\"{u}r$ Germanistik nach $zehnj\"{a}hriger$ Arbeit fertiggestellte Essence Koreanisch-Deutsche $W\"{o}rterb\"{u}ch$ (Minjung seorim 1982). Dieses $W\"{o}rterb\"{u}ch$ weist aber einige Nachteilen auf. Es fehlen jegliche Angaben zum Korpus. Man $st\"{o}{\ss}t$ beispielsweise oft auf selten gebrauchte $W\"{o}rter$, die Grundbedeutungen sind nicht erkennbar, die Erklarungen sind ungenau, manchmal sogar $irref\"{u}hrend\;und\;schlie{\ss}lich$ mitunter stilistisch falsch. Diese negativen Punkte wirken sich $ung\"{u}nstig$ auf den gesamten Lemprozess bis hin zur Lemmotivation aus. Aus diesen Gegebenheiten $erw\"{a}chst$ die Notwendigkeit der Erstellung eines neuen $W\"{o}rterb\"{u}ch$s, das auf die Situation von Sprachlemem abgestimmt ist, die zur Benutzung einsprachiger $W\"{o}rterbticher$ noch nicht imstande sind. Zweck des $W\"{o}rterb\"{u}chs$ ist der Einsatz im Fremdsprachenunterricht, woraus sich ein zweisprachiges $W\"{o}rterb\"{u}ch$ ergibt. Als Benutzerkreis werden insbesondere $Sprachlemanf\"{a}nger$ des Koreanischen und Deutschen ins Auge gefasst. Ihnen soll ein Nachschlagewerk an die Hand gegeben werden, das den koreanischen und deutschen Wortschatz anhand einer Systematik und eines alphabetischen Indexes der jeweiligen Sprache $erschlie{\ss}t$. Ais Zahl der Lemmata wird $f\"{u}r$ jede Sprache ca. 10,000 festgelegt. Ein Grundwortschatz, der die 3000 $h\"{a}ufigsten\;W\"{o}rter$ umfasst wird extra markiert. $Dar\"{u}ber$ hinaus bietet das $W\"{o}rterb\"{u}ch$ den darauf aufbauende Wortschatz von weiteren 7000 $W\"{o}rtern$. Die Teamarbeit der beiden Gruppen von Muttersprachlern steht in allen Arbeitsschritten im Vordergrund. Der damit verbundene Zweck ist die Erzielung der maximalen Genauigkeit der $Lemmaerkl\"{a}rungen$. Da dieses $W\"{o}rterb\"{u}ch$ ein $W\"{o}rterb\"{u}ch$ nach Sachgruppen ist, die Erstellung einer Systematik von $gro{\ss}er$ Bedeutung. $F\"{u}r$ das vorliegende Projekt gait daher eine Systematik zu finden, die nicht nur leicht nachvollziehbar, also praktikabel ist, sondern insbesondere von Benutzern aus zwei Kulturkreisen akzeptiert werden kann. Als $grunds\"{a}tzliche$, allerdings nicht in allen Bereichen $gleicherma{\ss}en$ anwendbare Ordnungsprinzipien gelten: Vom Oberbegriff zum Unterbegriff, vom allgemein zum speziell, vom Einfach zum Komplexen, von $au{\ss}en$ nach innen, Darin spiegelt sich das Prinzip der 'notwendigen Bedingung' wider.

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Synthesis of TAME, ETBE, and MTBE Using Heteropolyacid Catalyst (헤테로폴리산 촉매를 이용한 TAME, ETBE 및 MTBE 합성반응의 연구)

  • Park, Jin-Hwa;Yi, Yong-Woo
    • Applied Chemistry for Engineering
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    • v.8 no.4
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    • pp.582-588
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    • 1997
  • Synthetic reaction of TAME, ETBE, and MTBE compounds used largely for gasoline octane number enhancer to prevent air pollution was investigated using heteropolyacid catalyst in a fixed bed flow reactor. In the synthetic reaction of TAME, ETBE and MTBE, after hetero atom being replaced with poly atom, the activity of the catalyst, $H_4SiW_{12}O_{40}$ with coordinated bond with W and an hetero atom of Si was the highest among the catalysts tested. Also the activity depended upon the metals replaced which are related to the catalyst acidity. $FeHPW_{12}O_{40}$ and $K_3PM_{o12}O_{40}$ catalysts showed high activity in TAME synthesis, while they were not effective in ETBE and MTBE synthesis. In this study catalysts showing high activity were selected and mixed with equal weight combination of $H_4SiW_{12}O_{40}$ and $Sr_2SiW_{12}O_{40}$ ;$H_4SiW_{12}O_{40}$ and $NaH_2PW_{12}O_{40}$ ; $Fe_{1.5}PW_{12}O_{40}$ and $Mg_2SiW_{12}O_{40}$ ; $Mg_2SiW_{12}O_{40}$ and $Ba_2SiW_{12}O_{40}$. The mixed heteropolyacid catalysts showed higher TBA conversion rate and better selectivity of ETBE and MTBE than the single catalysts.

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Mesenteric Lymphatic Delivery of Oral Anticancer Tegafur by Emulsion Formulations (유제화에 의한 경구용 항암제인 테가푸르의 장관 임파수송)

  • Lee, Yong-Bok;Nam, Kweon-Ho;Chang, Woo-Ik;Oh, In-Joon;Koh, Ik-Bae
    • Journal of Pharmaceutical Investigation
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    • v.25 no.1
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    • pp.55-62
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    • 1995
  • W/O and O/W emulsions of tegafur (50 mg/5 ml/kg) were orally administered to rats to compare with their mesenteric lymphatic delivery effects. And also in order to demonstrate the lymph targeting associated to the oral route, it was deemed necessary to investigate the fate of solution after oral administration as a control. Lymph and plasma samples were periodically taken from each subject of mesenteric lymphatic duct cannulated rats. Then, lymph and plasma levels of tegafur and its active metabolite, 5-FU, were simultaneously observed. Also pharmacokinetic parameters were compared with each others. On the other hand, most previous studies of lymphatic transport have not addressed the question of whether an increase in mesenteric or thoracic lymph transport by the manipulation of a suspected variable was due to a selective delivery to the intestinal lymphatics or an overall increase availability. Therefore, based on a physiologically based pharmacokinetic model which represents the characteristics of lymphatic systems, we are also going to determine the contributions of mesenteric lymph transport versus thoracic lymph transport of tegafur reported in reference(13). In comparison with tegafur solution, AUC and mean residence time of plasma tegafur were significantly increased in W/O emulsion but significantly decreased in O/W emulsion. Lymph flow rates were similar in both solution and W/O emulsion but half in O/W emulsion. AUC of tegafur in mesenteric lymph and in plasma for W/O emulsion were 3.7 times and 2.9 times more than those for O/W emulsion, respectively. And AUC of 5-FU in thoracic lymph for W/O emulsion was 3.7 times more than that for O/W emulsion. These results suggested that lymphatic delivery or tegafur by W/O emulsion was more effective than that by on emulsion due to its differences or formation ability of chylomicrons.

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Effect of Tungsten on Selective Oxidation of Acrolein with Mo-V-W-O Mixed Oxide Cataysts (Mo-V-W-O 촉매상에서 아크로레인의 선택산화반응에 대한 텅스텐의 영향)

  • Na, Suk-Eun;Park, Dae-Won;Chung, Jong-Shik
    • Applied Chemistry for Engineering
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    • v.4 no.2
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    • pp.308-317
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    • 1993
  • The study is related to the synthesis of acrylic acid by selective oxidation of acrolein on Mo-V-W multicomponent mixed oxide catalysts. Mo-V-W-O(WVM), Mo-V-O/Mo-W-O(VM/WM), Mo-W-O/Mo-V-O(WM/VM) and mechanical mixtures of Mo-V-O and Mo-W-O(M-VM+WM) were prepared and characterized by BET, XRD, SEM and EPMA. Catalytic activity of these catalysts was tested in a continuous fixed bed reactor. In WVM catalysts small amount of tungsten added to VM increased surface area and selectivity of acrylic acid, but excess amount of tungsten decreased reaction rate of acrolein and selectivity. VM/WM catalysts, VM supported on WM, showed higher activity and selectivity than WM/VM catalysts where WM is supported on VM. Phase cooperation between WM and VM was observed in mechanical mixture of WM and VM and they showed higher yield than WM or VM.

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The Functions of Polyoxyethylene Tocopherylethers in the Formulations of Cosmetics (화장품 제형에서 폴리옥시에틸렌 토코페릴에테르의 기능)

  • 김영대;김창규
    • Journal of the Society of Cosmetic Scientists of Korea
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    • v.19 no.1
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    • pp.108-126
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    • 1993
  • The functions of polyoxyethylene tocopheryl ethers [POE(n)TEs] in emulsion, solubilization and gel were studied. For emulsification of liquid paraffin, POE(10)TE showed better emulsifying effect in O/W emulsions than others tested. The effects of oil and polyol content on the formulation of W/O and O/W emulsions were also studied. In O/W emulsion, the viscosity was increased by increasing the liquid paraffin content, at about 70%, and slightly increased by increasing the propylene glycol content, However, in W/O emulsion, the viscosity was decreased by increasing the oil content, and also decreased by increasing the propylene glycol content, For solubilization of perfume oil, POE(18)TE showed better solubilizing effect than the others tested. The gelling effect of POE(n)TEs increased with ethylene oxide chain length up to 50 moles. The gelling property was evaluated for hardness and viscosity.

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