• 제목/요약/키워드: 2-ET group

검색결과 817건 처리시간 0.024초

The Effect of Polarizability on Reactivity of 4-Nitrophenyl Benzoate and Its Sulfur Containing Analogues with Anionic Nucleophiles in Ethanol

  • Kwon, Dong-Sook;Park, Jee-Young;Um, Ik-Hwan
    • Bulletin of the Korean Chemical Society
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    • 제15권10호
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    • pp.860-864
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    • 1994
  • 2nd-order rate constants have been measured spectrophotometrically for the reactions of 4-nitrophenyl benzoate (1), S-4-nitrophenyl thiobenzoate (2) and 4-nitrophenyl thionbenzoate (3) with alkoxides, aryloxides and thioaryloxides in absolute ethanol at 25.0 ${\pm}0.1$${\circ}C$. The substitution of O by polarizable S in the leaving group has little affected the reactivity of 2 toward the charge localized species (eg. $EtO^-$ and $CF_3CH_2O^-$), while the effect of the similar replacement in the carbonyl group has led to a decrease in reactivity by a factor of 10. However, the reactivity of these esters toward charge delocalized aryloxides has been found to be in the order $1<3{\le}2$. The effect of replaced sulfur atom on reactivity becomes more significant for the reaction with polarizable thioaryloxides, i.e. the reactivity increases in the order $1<2{\ll}3$. The difference in reactivity for the present system is attributed to a polarizability effect.

중학생의 약물남용 비잠재군과 잠재군의 제특성 차이 (A Study on the Differences of Characteristics between Potential Substance-abuse Group and Healthy Group in Middle School Students)

  • 김영혜;주현옥;어용숙
    • Child Health Nursing Research
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    • 제12권3호
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    • pp.351-358
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    • 2006
  • Purpose: This study was attempted to find out the differences of characteristics between potential substance-abuse group and healthy group of middle school students in Busan. Method: The participants were 458 middle school students in Busan. The data were collected from 1st September 2004 to 31th October 2004 using structured questionnaire, and then were analyzed by SPSS-WIN 10.0 program with frequency, percentage, mean, standard deviation and $X^2-test$. Results: 23.6% of the subjects have been smoking, and 16.2% of them have been drinking. 18.6% of the subjects was classified to potential substance-abuse group based on the cut-point suggested by Lee et al.. The characteristics of potential substance-abuse adolescents are that they have religion and siblings, that their parents have divorced, that they don't live with their parents, and that their perceived health state is bad. Conclusion: Based on the findings of this study, It is necessary to develop a substance abuse prevention education program for potential substance-abuse group.

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Glycinato 및 Glycine Ester 리간드의 전자구조와 반응성에 관한 분자궤도함수론적 연구 (MO Studies on the Electronic Structure and Reactivity of Glycinato, Glycine Ester Ligands)

  • 김자홍
    • 대한화학회지
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    • 제24권1호
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    • pp.15-19
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    • 1980
  • Glycinato 및 glycine ester 리간드의 전자구조와 반응성을 조사하기 위하여 CNDO/2와 EHT 분자궤도함수법을 적용하였다. 두자리 배위자로 작용하는 glycinato 리간드의 구조는 탄소에서 질소쪽으로 가는 결합이 ${\Delta}O_4C_3C_2$${\Delta}O_3C_2N_1$ 평면에서 $105^{\circ}9'$의 dihedral angle을 가지는 Gly-I 구조가 Gly Ⅱ 구조보다 안정함을 알았으며, glycine ester 리간드에 대한 에너지 성분 분석 결과로서 alkyl가 치환에 따른 전자효과를 볼 수 있었다. CNDO/2 MO 계산으로 얻은 전자밀도 $q_N$값으로부터 리간드의 안정도 순위는 Glycinato>Gly-Et-Ester>Gly-i-Pr-ester>Gly-Me-ester 순으로 나타났다.

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간호사가 지각하는 임파워먼트와 직무만족, 조직몰입 (Nurses' perceptions of job-related empowerment, job satisfaction, and organizational commitment)

  • 이혜경
    • 간호행정학회지
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    • 제7권1호
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    • pp.65-84
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    • 2001
  • This descriptive study was designed to find out the relation between nurses' perceptions of job-related empowerment, job satisfaction and organizational commitment. The data was collected from 390 staff nurses in a tertiary hospital located in Seoul during the period of 2 weeks from October 6 to October 19, 2000 by means of structures questionnaire. Five instruments were used in this study included the Job Activity Scale(Laschinger et al., 1994, 1999), the Organizational Relationship Scale(Laschinger et al., 1994, 1999), The Conditions of Work Effectiveness Questionnaire(Chandler, 1986), the Minnesota Satisfaction Questionnaire(Weiss et al., 1967) and the Organizational Commitment Questionnaire(Mowday et al., 1979). The results were summarized as follows: 1) The mean of the CWEQ was 49.56percentile, and the support was perceived higher(56 percentile) than the other subscales, opportunity, information and resources. The mean of the MSQ was 49.4 percentile and the OCQ was 54.02 percentile. 2) Nurses' perception of job related empowerment was significantly related to job satisfaction(r=.650, p<.001), and organizational commitment(r=.458, p<.001). And the job satisfaction was related significantly to organizational commitment(r=.426, p<.001). Job satisfaction(r=.583, p<.001) and organizational commitment(r=.426, p<.001)have higher relation with the opportunity subscales of the CWEQ than the others. 3) The significant difference was found in the nurses' perception of the empowerment, job satisfaction and organizational commitment according to the age group, length of nursing career and ward. 4) Results of the stepwise multiple regression shows that the nurses' perception of the empowerment and organizational commitment explained 52% of job satisfaction, and also, the nurses' perceptions of the empowerment and job satisfaction explained 35% of organizational commitment. In conclusion, nurses' perception of the empowerment, job satisfaction and organizational commitment have a strong relationship. The finding suggests the importance of the empowering nurses to increase job satisfaction and organizational commitment.

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Efficacy of oxytocin antagonist infusion in improving in vitro fertilization outcomes on the day of embryo transfer: A meta-analysis

  • Kim, Seul Ki;Han, E-Jung;Kim, Sun Mie;Lee, Jung Ryeol;Jee, Byung Chul;Suh, Chang Suk;Kim, Seok Hyun
    • Clinical and Experimental Reproductive Medicine
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    • 제43권4호
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    • pp.233-239
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    • 2016
  • Objective: Uterine contraction induced by the embryo transfer (ET) process has an adverse effect on embryo implantation. The aim of this study was to determine the effect of oxytocin antagonist supplementation on the day of ET on in vitro fertilization outcomes via a meta-analysis. Methods: We performed a meta-analysis of randomized controlled trials (RCTs). Four online databases (Embase, Medline, PubMed, and Cochrane Library) were searched through May 2015 for RCTs that investigated oxytocin antagonist supplementation on the day of ET. Studies were selected according to predefined inclusion criteria and meta-analyzed using RevMan 5.3. Only RCTs were included in this study. The main outcome measures were the clinical pregnancy rate, the implantation rate, and the miscarriage rate. Results: A total of 123 studies were reviewed and assessed for eligibility. Three RCTs, which included 1,020 patients, met the selection criteria. The implantation rate was significantly better in patients who underwent oxytocin antagonist infusion (19.8%) than in the control group (11.3%) (n = 681; odds ratio [OR], 1.92; 95% confidence interval [CI], 1.25-2.96). No significant difference was found between the two groups in the clinical pregnancy rate (n = 1,020; OR, 1.57; 95% CI, 0.92-2.67) or the miscarriage rate (n = 456; OR, 0.76; 95% CI, 0.44-1.33). Conclusion: The results of this meta-analysis of the currently available literature suggest that the administration of an oxytocin antagonist on the day of ET improves the implantation rate but not the clinical pregnancy rate or miscarriage rate. Additional, large-scale, prospective, randomized studies are necessary to confirm these findings.

Thermo-oxidation behaviour of organic matrix composite materials at high temperatures

  • Cinquin, Jacques;Colin, Xavier;Fayolle, Bruno;Mille, Marion;Terekhina, Svetlana;Chocinski-Arnault, Laurence;Gigliotti, Marco;Grandidier, Jean-Claude;Lafarie-Frenot, Marie-Christine;Minervino, Matteo;Cluzel, Christophe;Daghia, Federica;Ladeveze, Pierre;Zhang, Fangzouh
    • Advances in aircraft and spacecraft science
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    • 제3권2호
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    • pp.171-195
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    • 2016
  • The present paper is a review of the main activities carried out within the context of the COMPTINN' program, a joint research project founded by a FUI program (Fonds $Unifi{\acute{e}}s$ $Interminist{\acute{e}}riels$) in which four research teams focused on the thermo-oxidation behaviour of HTS-TACTIX carbon-epoxy composite at 'high' temperatures ($120^{\circ}C-180^{\circ}C$). The scientific aim of the COMPTINN' program was to better identify, with a multi-scale approach, the link between the physico-chemical mechanisms involved in thermo-oxidation phenomena, and to provide theoretical and numerical tools for predicting the mechanical behaviour of aged composite materials including damage onset and development.

제주도 주목(Taxus cuspidata S. et Z.)의 Taxol 및 Cephalomannine의 함량분석 (Analysis of Taxol and Cephalomannine in Cheju Island Yew (Taxus cuspidata S. et Z.))

  • 곽상수;최명석;박용구;고경수;유장렬
    • 생약학회지
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    • 제26권2호
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    • pp.116-121
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    • 1995
  • To seek for a stable supply source of taxol as an anticancer agent urgently needed for the treatment of ovarian cancer, the concentrations of taxol and cephalomannine in bark and needles of 37 yew (Taxus cuspidata S. et Z.) trees grown in 6 locations of Cheju Island were analyzed by using HPLC. A considerable variation in the content was observed in plant part and the location. The average taxol content in the needles ($220.3{\;}{\pm}{\;}56{\;}{\mu}g$ per g dry wt) was ca. 4 times hgher than that in the bark, whereas the content of cephalomannine in the needles $(353{\;}{\pm}{\;}141{\;}{\mu}g)$ was ca. 5 times higher than that in the bark. Particularly, even within Cheju Island, needles from trees grown near the coast including Sogwipo area contained much higher taxol contents than needles from trees grown at mountain locations, indicating that taxane level is affected by environmental effects. Taxol in the needles was confirmed by electrospray mass spectrometry. These results suggest that the needles of yew trees growing in Cheju Island may provide a renewable source for taxol.

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Efficacy of testicular sperm chromatin condensation assay using aniline blue-eosin staining in the IVF-ET cycle

  • Park, Yong-Seog;Kim, Myo-Kyung;Lee, Sun-Hee;Cho, Jae-Won;Song, In-Ok;Seo, Ju-Tae
    • Clinical and Experimental Reproductive Medicine
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    • 제38권3호
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    • pp.142-147
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    • 2011
  • Objective: This study was performed to evaluate testicular sperm chromatin condensation using aniline blue-eosin (AB-E) staining and its effects on IVF-ET. Methods: Chromatin condensation was analyzed using AB-E staining in 27 cases of testicular sperm extraction. There were 19 cases of obstructive azoospermia (OA) and 8 cases of non-obstructive azoospermia (NOA) in IVF-ET. Mature sperm heads were stained red-pink whereas immature sperm heads were stained dark blue. The percentage of sperm chromatin condensation was calculated from the ratio of the number of red-pink sperm to the total number of sperm analyzed. Results: The overall percentages of chromatin condensation in OA and NOA were $31.1{\pm}11.2%$ and $26.3{\pm}14.4%$, respectively. The fertilization rate was significant higher in OA than NOA ($p$ <0.05); however, the rates of good embryos and clinical pregnancy did not show statistical differences. In OA and NOA, statistical differences were not observed in the rate of chromatin condensation, fertilization, good embryos, and clinical pregnancy between the pregnant group and non-pregnant group. Conclusion: Chromatin condensation is less stable than OA and showed a low fertilization rate in NOA. While there were no significant differences in chromatin condensation results between NOA and OA, we propose that a pattern of decreased chromatin condensation in NOA is one of the factors of low fertilization results requiring further study.

한국형 시판 도시락의 영양가 및 식염함량 (A Study on Nutritive Values and Salt Contents of Commercially Prepared Take-Out Boxed-Lunch In Korea)

  • Kim, Bok-Hee;Lee, Eun-Wha;Kim, Won-Kyung;Lee, Yoon-Na;Kwak, Chung-Shil;Mo, Sumi
    • Journal of Nutrition and Health
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    • 제24권3호
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    • pp.230-242
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    • 1991
  • 시판 도시락의 이용도가 크게 증가함에 따라, 시판 중인 한국형 도시락의 영양가와 염분량 등을 조사하고자 백화점, 체인점, 열차 등에서 10가지 종류의 도시락을 구입하였다. 영양가는 식품분석표에 의하여 계산하였고 염분은 원자흡광법에 의하여 Na 함량을 분석한 후 환산하였다. 도시락은 두가지를 제외하고는 모두 밥과 반찬이 따로 포장되어 있었고, 그 무게는 각각 304.6g, 312.4g으로 무거운 편이었다. 반찬의 수는 평균 12가지였는데 그중 단백질 식품이 6가지로 가장 많았고, 칼슘 식품은 3도시락에만 있었고 그것도 멸치 볶음 한기지였다. 열량은 평균 840.7kral로 남녀성인이 1끼 권장량보다 많았고, 단백질 38.9g, 지질 22.7g, 칼슘 300.8mg, 인 410.8mg, 철분 6.61mg, 비타민 A 219.8R.E., 티아민 0.46mg, 리보플라빈 0.67mg, 나이아신 10.5mg, 비타민 C 27.5mg으로 비타민 A만이 남녀성인 1끼 권장량에 약간 미달하였고, 다른 영양소들은 평균적으로 권장량이상 이었다. 또한 3000원 이상의 도시락은 2000원 이하의 도시락에 비해 동물성 식품이 많아서 단백질, 칼슘, 철, 나이아신이 유의적으로 더 많았다(P<0.05). 탄수화물, 단백질, 지질의 열량비율은 평균 57.4%, 18.3%, 24.3%로 양호하였다. 조리법은 전(22.3%)과 튀김(16.0%)이 가장 많았고 조림, 구이, 볶음 등 건식 조리법이 주로 이용되어 많은 반찬가짓수에 비해, 실제 식단은 단조로운 편이었다. 염분의 함량은 3.53g에서 8.80g으로 평균 5.76g이나 되어, 한끼 필요량을 크게 초과하고 있었다. 앞으로 도시락의 염분함량을 줄이는 동시에 다양한 조리법과 식단으로 맛있고 보기좋고 영양적으로 균형잡힌 도시락 식단을 개발하는 데 노력을 기울여야 하겠다.에 세계적 기술 경쟁력도 확보할 수 있을 것이다. 본 해설에서는 로봇 및 시스템 제어에 관한 기초 이론과 신경회로 적용기술을 소개하고 기존방법과 비교했을 때의 우월성, 전세계적인 응용연구, 국내외 연구개발 현황, 상업화 가능성, 산업계 응용례, 기술상의 문제점, 향후 전망 등을 다루기로 한다.중에 의한 천이 구조응답 해석을 위한 효과적인 방법에 대해서도 연구결과를 발표할 계획이다.이 무거울수록 우화율이 높은 편이었다. 이앙시기별 월동유충에서 우화시기까지의 기간은 조기이앙답이 44일, 중기이앙답이 47일, 후기 이앙답이 51일간으로 늦게 이앙할수록 기간이 더 긴 경향이었다.-35.6dB였다. 또, 50kHz에서 말쥐치, 민어, 노래미, 넙치에 대한 그 값은 각각 -37.2dB, -37.3dB, -31.9dB, -36.0dB였다. 한편, 어체의 평균반사강도의 추정정도는 자원량추정치의 신뢰도를 좌우하는 직접적인 요인이 되므로, 앞으로 이 문제에 대해서는 보다 체계적인 연구가 필요하다고 판단된다. 그물베도라치 Dictyosoma burgeri Van der Hoeven 및 황점 베도라치Dictyosoma wbrimaculata Yatsu, Yasuda et Taki, 그리고 황줄베도라치란 Pholididae의 황줄베도라치 Phoris taczanowskii(Steindachner), 오색베도라치 Phoris omotus (Girad), 베도라치 Pholis nebuloso(Temminck et Schlegel), 횐베도라치 Pholisfangi(Wang et Wang) 및 점베도라치 Pholis crossispino(Temminck et Schlegel)의 17속 25종이 분류되었다. 이중에서 Zoarchias glaber, Chirofophis oui, Alectrias benjamini, Dictyosoma

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몇몇 조경용 관목의 보행제어 효과에 관한 연구 -관목개체의 수지밀도를 중심으로- (A study on rating system of some shrubs for pedestrian control ; concentrate upon the density of branch)

    • 한국조경학회지
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    • 제26권2호
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    • pp.91-100
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    • 1998
  • This paper is to study on rating system of some shrubs for pedestrian control with concentrate upon the density of branch. It was usd that Hibiscus syricacus L., Spiraea prunifolia var. simpliciflora Nak, Ligustrum obtusifolium S. et Z., Callicarpa dichotoma Raeusch., Rhoododendron mucrionulatum Turcz., Syringa vulgaris L., Weigela subsessilis L. H. Bailey, Cercis chinensis bunge, Forsythia koreana Nak., Euonymus alatus Sieb, Chaenomeles speciosa Nak., orbaria sorbifolia var. stellipila Max., Deutzia parviflora Bunge, Kerria japonica De Candolle, Prunus tomentosa Thunberg ex Murray, Purunus grandulosa for. albiplena Koehne. Shrubs are invesitgated ito the density of branch, the power of sprout, height, a rate of growth, hardness of naturalizaton, crown width and existence of thorns. Shrubs belonged to high group of rating system for pedestrian control were Euonymus alatus Sieb, Purunus grandulosa for. albiplena Koehne, Chaenomeles speciosa Nak., Spiraea prunifolia var. simpliciflora Nak., Prunus tomentosa Thunberg ex Murray, Rhododendron mucronulatum Turcz., Hibiscus syricacus L., Ligustrum obtusifolium S. et Z., Syringa vulgaris L., Weigela subsessilis L.H.Bailey.

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