• 제목/요약/키워드: Castor

검색결과 197건 처리시간 0.028초

Pleuritis and pericarditis associated with Klebsiella pneumoniae in a Eurasian beaver (Castor fiber)

  • You, Mi Hyeon;Kim, Ji Hyung;Kim, Dae Yong;Gomez, Dennis Kaw;Jung, Tae Sung;Park, Se Chang
    • 대한수의학회지
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    • 제48권4호
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    • pp.501-503
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    • 2008
  • An adult one-year-old male Eurasian beaver (Castor fiber) died of a traumatic injury to its right leg from a fall. At necropsy, fibrinopurulent exudates were observed in the thoracic cavity. Histopathologic examination showed that the pericardium, thoracic wall, pulmonary pleura and the lungs were markedly thickened due to mixtures of necrotic cellular debris, neutrophils, fibrin, red blood cells, and bacterial aggregates. Pure culture of Klebsiella (K.) pneumoniae was isolated from the thoracic exudates, pleura and heart tissues. Based on these findings, this is the first report describing pleuritis and pericarditis associated to K. pneumoniae in a beaver.

Safety Evaluation of Polyethylene Glycol (PEG) Compounds for Cosmetic Use

  • Jang, Hyun-Jun;Shin, Chan Young;Kim, Kyu-Bong
    • Toxicological Research
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    • 제31권2호
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    • pp.105-136
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    • 2015
  • Polyethylene glycols (PEGs) are products of condensed ethylene oxide and water that can have various derivatives and functions. Since many PEG types are hydrophilic, they are favorably used as penetration enhancers, especially in topical dermatological preparations. PEGs, together with their typically nonionic derivatives, are broadly utilized in cosmetic products as surfactants, emulsifiers, cleansing agents, humectants, and skin conditioners. The compounds studied in this review include PEG/PPG-17/6 copolymer, PEG-20 glyceryl triisostearate, PEG-40 hydrogenated castor oil, and PEG-60 hydrogenated castor oil. Overall, much of the data available in this review are on PEGylated oils (PEG-40 and PEG-60 hydrogenated castor oils), which were recommended as safe for use in cosmetics up to 100% concentration. Currently, PEG-20 glyceryl triisostearate and PEGylated oils are considered safe for cosmetic use according to the results of relevant studies. Additionally, PEG/PPG-17/6 copolymer should be further studied to ensure its safety as a cosmetic ingredient.

Characteristics and Breeding of a New Thornless Castor aralia Cultivar, 'Cheongsong II'

  • Kim, Sea-Hyun;Jung, Hyun-Kwon;Jang, Yong-Seok
    • Plant Resources
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    • 제7권2호
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    • pp.123-126
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    • 2004
  • New thornless cultivar of castor aralia(Kalopanax septemlobus Koidz.) was developed and selected in Cheongsong, Prov. of GyeongSangbuk-do during the period from 1994 to 1999 by Korea Forest Research Institute(KFRI). The new thornless cultivar, "Cheongsong II" is characterized by a thinner outer-bark and soft, wider leaves, and is particularly characterized by thornless stems. This cultivar has a thinner outer-bark(8.82mm) when compared with thorned type trees(13.95mm). It also has a larger leaves than does thorned type trees. Consequently, the new thornless cultivar, "Cheongsong II" is defined to have thinner bark and longer and wider leaves than do other thorned type trees. thorned type trees.

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흰쥐에서 ${\alpha}$-Adrenaline 效能 藥物등이 피마자油 誘發泄瀉에 미치는 영향 (Effects of ${\alpha}$-Adrenergic Drugs on Castor Oil Induced Diarrhea in Rats)

  • 허인회;이도익;이종흔;김동휘
    • 약학회지
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    • 제28권4호
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    • pp.237-241
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    • 1984
  • The effect of lofexidine, clonidine, and other drugs on castor oilinduced diarrhea in rats was investigated. Castor oil was administered orally and drugs were administered intraperitoneally. The results were as follows. 1. Lofexidine(0.1-43{\mu}mol$/kg) blocked dose dependently caster oil-induced diarrhea like clonidine, but its potency was weaker than that of clonidine, 1. Yohimbine (1-10{\mu}mol/kg$) antagonized the antidiarrheal action of lofexidine and clonidine. 3. Prazosin (3-30{\mu}mol/kg$) did not antagonize the antidiarrheal action of lofexidine and clonidine. 4. Metoclopramide, bromocriptine mesylate, and nadolol did not affect antidiarrheal action of lofexidine significantly. 5. Loperamid prolonged the antidiarrheal action of lofexidine.

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Response Surface-Optimized Isolation of Essential Fatty Acids via Castor Oil Dehydration

  • Suratno, Lourentius;Imanuel, Anugerahwan;Brama, Andika;Adriana Anteng, Anggorowati;Ery Susiany, Retnoningtyas;Kiky Corneliasari, Sembiring;Wiyanti Fransisca, Simanullang
    • 대한화학회지
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    • 제67권1호
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    • pp.28-32
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    • 2023
  • The reaction conditions optimization, including the temperature of the reaction, amount of catalyst required, and reaction time for the linoleic acids (LAs) and conjugated linoleic acids (CLAs) production by catalytic dehydration of castor oil via saponification was investigated by response surface methodology (RSM). It was confirmed that all three parameters (temperature, time, and amount of catalyst) were influential factors in isolating LAs and CLAs. When the temperature was increased, the iodine value increased, and the reaction time and catalyst amount increased. The optimal reaction conditions were: 240 ℃, 2.2 h reaction time, and 7 wt% catalyst amount. The maximum iodine value reached 156.25 with 91.69% conversion to the essential fatty acids.

피마자유와 양명아주 추출물을 원료로 하는 유기농업자재 유효성분의 열 안정성 평가 (Thermal Stability of Representative Bioactive Compounds in Biopesticide Derived from Castor Oil or Wormseed Extract under Controlled Temperature)

  • 최근형;정동규;진초롱;노진호;박병준;문병철;김진효
    • 한국환경농학회지
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    • 제36권1호
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    • pp.17-21
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    • 2017
  • BACKGROUND: Castor oil and wormseed extract are important active ingredients for biopesticide, and ricinoleic acid in castor oil and three monoterpenes (ascaridole, carvacrol and p-cymene) in wormseed extract are known bioactive substances. However, their stabilities had not been studied, even though the stability was the core property for estimation of shelf-life of biopesticide. Aimed to investigate the thermal stabilities of the bioactive substances in castor oil and wormseed extracts. METHODS AND RESULTS: The contents of ricinoleic acid and three monoterpenes (ascaridole, carvacrol and p-cymene) were analyzed by gas chromatography (GC). The thermal stabilities of the bioactive substance were measured at $0^{\circ}C$, $23^{\circ}C$, $30^{\circ}C$, $40^{\circ}C$, $45^{\circ}C$ and $54^{\circ}C$ for 84 d. The half-lives of ricinoleic acid in biopesticides was ranged from 28.9 d to 57.8 d at $30^{\circ}C$, and the stability of pure castor oil were located in the range ($t_{1/2}$=46.2d for Indian product and 27.7 d for Korean product) at the same temperature. The half-lives of the total monoterpenes in biopesticides were ranged from 3.9 d to 27.7 d at $30^{\circ}C$. Among the monoterpenes, the stability ascaridole and p-cymene were decreased in acidic condition. All the bioactive substances showed similar stability on the different thermal conditions. CONCLUSION:The half-lives of most bioactive substance from castor oil and wormseed extracts were less than 100 d. To increase the stability of bioactive substance in biopesticide, stabilizing additives like antioxidant and oxygen remover should be considered to extend of the shelf-life.

Castor Oil과 TDI로 합성한 폴리우레탄 방수코팅이 전분-글리세롤 필름의 습도반응특성에 미치는 영향 (The Effects of Water-Proof Polyurethane Coating based on Castor oil and TDI on the Starch-Glycerol Film Under Humidity)

  • 양영준;신형철;김대현;나성기;박종신
    • 한국섬유공학회:학술대회논문집
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    • 한국섬유공학회 2002년도 봄 학술발표회 논문집
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    • pp.289-292
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    • 2002
  • 전분을 이용한 환경친화성 고분자 플라스틱 재료에는 전분충진형, blend형 등이 있으나, 대체로 전분은 보조재료로 사용된다. 이에 반해 extruder를 이용한 전분발포체나 TPS (Thermoplastic starch) 등은 전분을 주재료로 사용하여 플라스틱 재료를 만드는 것이지만, TPS 필름의 Tg가 실온보다 높아 glassy 상태의 brittle한 성질로 인해 물성이 낮으며, 수분 친화적인 성질로 인해 플라스틱 재료로서의 사용이 제한되는 단점이 있다[1,2]. (중략)

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피마자유 기반 폴리올에 따른 폴리우레탄 폼의 물성 변화 연구 (Study on the Physical Properties of Polyurethane Foam Synthesized by Castor Oil Based Polyol)

  • 이성현;김광인;오정석;윤미정;김상범
    • 한국가스학회지
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    • 제16권5호
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    • pp.66-75
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    • 2012
  • 본 연구에서는 석유계 폴리올을 대체하기 위하여 식물성 천연유인 피마자유를 개질한 천연유 기반 폴리올(Castor Oil based Polyol, COP)을 사용하여 폴리우레탄 폼을 합성하였다. 접촉각과 표면장력실험을 통해 계면활성제에 따른 석유계 폴리올과 COP와의 상용성을 측정하였다. 최적의 COP 함량과 계면활성제(surfactant)를 찾기 위해 COP 함량을 0 wt%에서 80 wt%까지 변화시키고, 계면활성제 L-580K, DC-5950, BF-2470를 사용하여 폴리우레탄 폼을 합성한 결과 COP의 함량이 30wt%이고 계면활성제로 BF-2470을 사용하였을 때 가장 우수한 기계적 물성을 나타내었다.

백출산(白朮散)과 백편두(白扁豆)가 백서(白鼠) 소장(小腸)과 대장(大腸) 배상세포내(杯狀細胞內) 점액질(粘液質)에 미치는 영향(影響) (Effects of Backchulsan and Backpeundu on the mucosubstance of the goblet cells in the small and large intestines of the mouse)

  • 김진택;김태훈;김동환
    • 동국한의학연구소논문집
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    • 제2권2호
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    • pp.69-84
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    • 1993
  • This study was performed to identify the effect of Backchulsan and Backpeundu, on the muco-substances of the goblet cells in the small and large intestines of the mouse. After injected castor oil into oral cavity, the experimental animals were administrated with 5.952mg per 30g body weight of Backchulsan, with 0.519mg per 30g body weight of Backpeundu. The specimens used in this study were obtained from the small and large intestines of the mouse. All specimens were stained with periodic acid-Schiff reaction, alcian blue pH 2.5 and alcian blue pH 1.0 procedures. The results were as follows : 1. The most remarkable decrease of neutral and acid mucosubstance was observed in the control group 1 and 6 hours after castor oil administration. 2. Increase of neutral and mucosubstance was observed in Backchulsan administration group 3 hours in comparision with that of control group administrated of castor oil, especially of the upper and lower villi regions. 3. Increase of neutral and acid mucosubstance was observed in Backpeundu administration group 6 hours in comparision with that of control group administration of castor oil. 4. The most remarkable increase of neutral and acid mucosubstance was observed in Backchulsan administration group after 3 hours in comparision with that of Backpeundu administration group.

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Single and mixed chelants-assisted phytoextraction of heavy metals in municipal waste dump soil by castor

  • Wuana, Raymond A.;Eneji, Ishaq S.;Naku, Julius U.
    • Advances in environmental research
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    • 제5권1호
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    • pp.19-35
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    • 2016
  • The phytoextraction of some toxic heavy metals from municipal waste dump soil by castor plant (Ricinus communis) was tested under natural and single or mixed chelant-assisted scenarios in pot microcosms. A sandy loam with total metal contents (mg/kg): Cd (84.5), Cu (114.5), Ni (70.3), Pb (57.8), and Zn (117.5), was sampled from an active dumpsite in Calabar, Nigeria and used for the study. Castor (small seed variety) was grown under natural phytoextraction or single/binary chelant (citric acid, oxalic acid, and EDTA) applications (5-20 mmol/kg soil) for 63 days. Castor exhibited no visual phytotoxic symptoms with typically sigmoid growth profiles at the applied chelant doses. Growth rates, however, decelerated with increase in chelant dose. Post-harvest biomass yields were higher under chelant application than for natural phytoextraction. Both root and shoot metal concentrations (mg/kg) increased quasilinearly and significantly ($p{\leq}0.05$) with increase in chelant dose, furnishing maximum levels as: Cd (55.6 and 20.9), Cu (89.5 and 58.4), Ni (49.8 and 19.6), Pb (32.1 and 12.1), and Zn (99.5 and 46.6). Ranges of translocation factors, root and shoot bioaccumulation factors were 0.21-3.49, 0.01-0.89 and 0.01-0.51, respectively. Overall, the binary chelant treatments were less toxic for R. communis growth and enhanced metal accumulation in shoots to a greater extent than the single chelant scenarios, but more so when EDTA was present in the binary combination. This suggests that the mixed chelants could be considered as alternative treatments for enhanced phytoextraction and revegetation of degraded waste dump soils.