• Title, Summary, Keyword: NMA

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Interplay of the Intramolecular Water Vibrations and Hydrogen Bond in N-Methylacetamide-Water Complexes: Ab Initio Calculation Studies

  • Kim, Joo-Hee;Cho, Min-Haeng
    • Bulletin of the Korean Chemical Society
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    • v.24 no.8
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    • pp.1061-1068
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    • 2003
  • The correlation between the water and N-methylacetamide (NMA) intramolecular vibrational frequencies and the hydrogen-bond length in a variety of NMA-H₂O and NMA-D₂O complexes was investigated by carrying out ab initio calculations. As the hydrogen-bond length decreases, the frequencies of bending and stretching modes of the hydrogen-bonding water increases and decreases, respectively, and the amide I and II (III) mode frequencies of the NMA decreases and increases, respectively. In this paper, correlation maps among the amide (I, II, and III) modes of NMA and three intramolecular water modes are thus established, which in turn can be used as guidelines for interpreting two-dimensional vibrational spectra of aqueous NMA solutions.

Growth Associated Hormones Response and Fat Metabolism Change in Finishing Pigs Fed with n-Methyl-d, L-Aspartate

  • Xi, Gang;Xu, Zirong;Xiao, Ping
    • Asian-Australasian Journal of Animal Sciences
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    • v.15 no.7
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    • pp.1026-1030
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    • 2002
  • A trial was conducted to investigate the effect of dietary NMA on several growth associated hormones and fat metabolism in finishing pigs. A total of 84 crossbred finishing pigs (average initial BW of $56{\pm}$0.37kg) were divided into 6 pens, 14 pigs per pen (7 gilts and 7 barrows per pen). 3 pens of pigs were fed with control diet (corn-soybean meal) and the others were fed control diet addition with 50 mg/kg NMA. During the trial, all pigs were given free access to feed and water. After 44 days trial, 8 pigs from each treatment (4 gilts and 4 barrows, weight similar to average group weight, $86.94{\pm}0.71kg$ for control group, and $90.55{\pm}1.51kg$ for NMA treated group) were sacrificed to collect the sample of the liver, longissimus muscle, subcutaneous fat (10th rib). The addition of NMA in diet increased the IGF-I, Insulin, T3, T4 levels in serum by 50.68% (p<0.05), 38.36% (p<0.05), 123.33% (p<0.01), 60.58% (p<0.03), respectively. Meanwhile, IGF-I level in the liver and the muscle were increased with 17.83% (p<0.03) and 26.00% (p<0.03) with addition of NMA. The data from subcutaneous fat (10th rib) analysis showed that supplement of 50 mg/kg NMA decreased the total activities of malic dehydrogenase (MDH) by 20.54% (p<0.05), glucose-6- phosphate dehydrogenase (G-6-DPH) by 16.97% (p<0.05), and decreased the specific activities of MDH and G-6-DPH by 37.46% (p<0.01) and 35.06% (p<0.01), respectively. The hormone sensitive lipase (HSL) total activity was increased by 25.00% (p<0.05) in NMA treated pigs. These results indicated that addition of 50 mg/kg NMA to diet can induce the endocrine great change in finishing pigs, furthermore, inhibit the fat synthesis through suppressing lipogenic enzymes and promote the fat degradation by elevating HSL activity in finishing pigs.

Phosphorus-nitrogen Synergism and Their Thermal Behavior of Vinyl Phosphonate Oligomer-NMA Treated Cotton Fabrics (Vinyl Phosphonate Oligomer-NMA 처리 면직물에 있어서의 인-질소상승효과와 처리직물의 열적성질)

  • 김영호;고양원
    • Textile Science and Engineering
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    • v.18 no.2
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    • pp.38-48
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    • 1981
  • Phosphorus-nitrogen synergism in vinyl phosphonate oligomer (Fyrol 76) and N-methylol-acrylamide (NMA) treated cotton fabrics was studied through LOI and char length. And their thermal behavior under inert gas was also investigated through DSC, TGA and GC. When the total content of flame retarding element P and N was held constant, the maximum synergistic effect was observed at the P to N ratio 7:3-6:4. The DSC curves for Fyrol 76/NMA treated cotton fabrics under nitrogen atmosphere show an exothermic peak and two endothermic peaks. The second endothermic peak which is due to the decomposition of cellulose shifts 50-60$^{\circ}$C lower than the untreated cotton fabric. In the GC and TGA analysis of Fyrol 76/NMA treated cotton fabrics, the amount of evolved CO2 and remained char increased as the amount of flame retardant material increased. These facts show empirically that the pyrolysis of flame retardant finished cotton fabrics follows the dehydration theory.

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Dyeing of Poly(ethylene terephthalate)/Cotton Blends Modified with Cationic Agents (카티온화에 의한 폴리에틸렌테레프탈레이트/면 혼방직물의 염색)

  • 정용식;이학노
    • Textile Science and Engineering
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    • v.33 no.9
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    • pp.805-813
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    • 1996
  • Dyeing properties of poly(ethylene terephthalate) and cotton modified with cationic agents were investigated. N-methylol compounds such as N-methylolacrylamide(NMA) are highly reactive toward cotton in the presence of Lewis acid catalysts. Modified cotton with NMA has the pendant double bond as a site for Michael addition to various amines such as ethylene diamine(ED), methylamine and so on. NMA is expected to react with terminal hydroxy group of PET, and ED causes the aminolysis of ester groups of PET main chain besides the modified PET with NMA. Therefore PET and cotton modified with NMA and ED have acid dyeing sites and cotton had a good dyeing property for acid dye even at low concentration of ED. High concentration of ED was needed for acct dyeable PET in exchange for the physical properties of the fiber. PET modified with ED have amino functional groups which act as ligands to transition metals and form metal chelate resin. This enables PET to be dyed with 1:1 metal complex dye.

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Antimicrobial Finish of Cotton Fabric with Acrylamidomethyl Chito-oligosaccharide (Acrylamidomethyl Chito-oligosaccharide를 이용한 면직물의 항미생물 가공)

  • 이재원;남창우;고석원
    • Textile Science and Engineering
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    • v.36 no.10
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    • pp.769-775
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    • 1999
  • Chito-oligosaccharide (COS) was prepared by depolymerizing chitosan using sodium nitrite. The COS has many advantages in the application to fabrics compared with high molecular-weight chitosan, such as soft handle and uniform distribution. to introduce the reactive groups to COS, we prepared acrylamidomethyl chito-oligosaccharide (COS-NMA) by the reaction of COS with N-methylolacrylamide (NMA) in acidic medium, and the reaction product was characterized by $^1$H-NMR analysis. Cotton fabrics were treated with COS-NMA by a two-step process: the application of an acidic COS-NMA solution to cotton fabrics in the first step and then its reaction in an alkaline medium. Antimicrobial activity of the COS-NMA treated cotton fabrics was excellent. Durability to laundering of the treated fabrics was high enough to retain antimicrobial activity after twenty cycles of laundering.

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Curing Behavior and Morphology of DGEBA/NMA/2,4,6-tris(dimethylaminomethyl) phenol System (DGEBA/NMA/2,4,6-tris(dimethylaminomehyl)phenol 시스템의 경화거동 및 Morphology)

  • 김민영;김성호;최영선;김원호;황병선
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.118-121
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    • 2001
  • The investigation of cure kinetics and morphology studies on DGEBA/PEI/Anhydride system were performed by differential scanning calorimetry and scanning electron microscopy. Autocatalystic kinetics model was applied by isothermal scan test. Ozawa method and Kissinger method was applied by temperature scan. Activation energy was 95kJ/mol for neat DGEBA/NMA, 120kJ/mol for DGEBA/PEI(10p.h.r.)/NMA. The generation of secondary phase of PEI was observed and its size was grown up by increasing contents of PEI.

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Study on the Gastrodiae rhizoma as Applications in YackSun(Medicated Diets) for Preventing of Cerebral Cardiovascular Disease (2). Development and Sensory Characteristics of Dasik Made from Gastrodiae rhizoma (천마를 이용한 뇌혈관성 질환의 예방을 위한 양생약선(養生藥膳)의 개발을 위한 연구 (2). 천마를 주재료로 한 다식의 제조 및 관능적 특성)

  • Jung, In-Chang;Na, Hye-Young;Lee, Youn-Hee;Park, Sung-Hye
    • Journal of the East Asian Society of Dietary Life
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    • v.17 no.2
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    • pp.250-257
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    • 2007
  • This study was performed to provide basic for predicting the usefulness of Gastrodiae rhizoma(Cho'nma) as a food material for oriental applied diet therapy(YackSun). Thus, Gastrodiae rhizoma was used to develop a traditional Korean snack, Dasik. As a useful food resource, Gastrodiae rhizoma along with Cortex fraxini powder, was used to prepare Dasik. Cho'nma powder was added to the Dasik 63.2%(Dasik-1), 42.2%(Dasik-2) and 21.0%(Dasik-5) of Cho'nma powder to Dasik in one piece(5 g). The moisture and crude ash contents of the Dasik-1, 2 and 3 were analyzed. Physio-chemical analysis and a sensory test were also performed on the Dasik. Moisture and crude ash contents of Dasik-1 were 20.16% and 0.65%, respectively. Moisture and crude ash contents of Dasik-2 and Dasik-3 were 22.92 and 27.17% and 0.49 and 0.23% respectively. from the color test, the t value of Dasik-1 was found to be significantly low but the b value of Dasik-1 significantly high compared with the other preparations. The addition of Cho'nma had a tendency to impart high hardness, fracturability, gumminess and chewiness. Therefore, the addition of Cho'nma made the texture of Dasik denser. From the sensory test, the color, chewiness and overall acceptability of Dasik-1 were found to be significantly high. In conclusion, the addition of 63.2% Cho'nma per piece would be a useful recipe to enhance the quality of Dasik, and the flour Cho'nma showed better result than the Dasik-2 and Dasik-3.

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Introduction of Reactive Groups to Cotton Fabrics Using N-methylolacrylamide (N-methylolacrylamide에 의한 면직물에의 반응성기 도입)

  • 이승구;이의소
    • Textile Science and Engineering
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    • v.26 no.4
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    • pp.21-26
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    • 1989
  • When cellulose is treated with N-methylolacrylamide(NMA) in the presence of acid catalysts, pendant C=C double bonds (vinyl group) are created on cellulose. These double bonds are capable of addition reaction with the residual hydroxyl group of cellulose fibers or other reactive groups of dyestuffs. In this study the effect of NMA concentration, amount of catalysts, and curing time was in vestigated when the C=C double bonds are introduced to cellulose using NMA. Furthermore the effect of NaOH concentration, reaction temperature and time was studied when the created C=C double bonds react with the unreacted hydroxyl groups of cellulose in the presence of NaOH catalysts.

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A Study Improving the Dyeing Properties of Cationized Cotton Fabrics with Reactive Dyes (캐티온화제 처리 면직물에 대한 반응염료의 염색성 향상)

  • 이학노;김명균
    • Textile Science and Engineering
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    • v.33 no.11
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    • pp.955-966
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    • 1996
  • Four kinds of cationized cottons such as acrylamide-cotton(AAM-cotton), aminoethyl cotton(AME-cotton), N-methylolacrylamide-methylamine-cotton(NMA-MA-cotton) and poly-epichlorohydrin-ethanolamine -cotton(PECH-EA-cotton) were prepared and their dyeing properties with reactive dyes were examined. All four cationized cottons could be dyed with reactive dyes using a small amount of electrolyte and alkali, especially NMA-MA-cotton could be dyed without electrolyte and alkali. The dye fixation on AAM-cotton, AME-cotton and PECH-EA-cotton were increased with alkali concentration in dyebath but that of NMA-MA-cotton was decreased. The wash fastness of cationized cottons was generally good and light fastness of AME-cotton was grade 4~5.

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Mechanical Properties of Recycled Coarse Aggregate concrete using Two-Stage Mixing Approach (TSMA 방법을 이용한 순환 굵은골재 콘크리트의 기계적 성능)

  • Kwon, Seung Jun;Lim, Hee Seob;Lee, Han Seung;Lim, Myung Kwan
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.22 no.4
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    • pp.60-67
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    • 2018
  • As the lack of specific aggregation intensifies, the development of alternative resources is urgent. Construction waste is increasing every year, but recycled aggregate is used as a low value added material. Various studies are currently underway at the national level. In this paper, the mechanical performance of the concrete according to the concrete mixing method and the replacement amount of the circulating coarse aggregate was compared and evaluated. Concrete mixing method was normal mixing approach(NMA) method, two-stage mixing approach1 (TSMA1) method, two-stage mixing approach2 (TSMA2) method. Fresh concrete was tested for air content, slump test, and unit volume weight. Compressive strength and flexural strength were tested in hardened concrete. According to the TSMA method, the mechanical performance difference of concrete is shown, and the strength is decreased according to the circulating coarse aggregate replacement amount.