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RISS 인기검색어
- 검색키워드
- 저자 : J. Liesegang (검색결과 3 건)
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A surface and electrochemical study of polypyrrole coated on stainless steel and copper
J. Liesegang,N. Brack,P. J. Pigram,W. Prissanaroon 한국물리학회 2004 Current Applied Physics Vol.4 No.2-4
The micro-contact printing process (l CP) oers an alternative route for the formation of conducting polymer structures onvarious substrates for application in polymer-based electronic devices. Understanding the surface and interface chemistry of thepolymer/substrate system is a vital element in the production of adherent polymer patterns vial CP. In the present study, electricallyconducting polypyrrole lms doped with dodecylbenzenesulfonic acid, PPy(DBSA), have been electropolymerised on stainless steeland copper substrates in aqueous media. PPy(DBSA)/metal interfaces and PPy(DBSA) surfaces have been characterised by X-rayphotoelectron spectroscopy (XPS) and time-of-ight secondary ion mass spectrometry (TOF-SIMS). An electrochemical study ofPPy(DBSA) growth has been carried out by cyclic voltammetry (CV). Iron and copper were detected at the polymer/electrodeinterfaces indicating their dissolution from the stainless steel and copper substrates, respectively, during electropolymerisation. Inaddition, a thin layer of DBSA was observed at the polymer/electrode interface. The eect of growth potential on doping level wasalso investigated. Adherent PPy coatings on the metal electrodes have been produced and the doping level tailored for optimisationof electroactive devices produced via l CP.
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Mineral Metabolism in Singleton and Twin-pregnant Dairy Goats
C.J. Harter,D.S. Castagnino,A.R. Rivera,L.D. Lima,H.G.O. Silva,A.N. Mendonca,G.F. Bonfim,A. Liesegang,N. St-Pierre,I.A.M.A. Teixeira 아세아·태평양축산학회 2015 Animal Bioscience Vol.28 No.1
During pregnancy, the maternal body undergoes significant physiological changes. The present study assessed the changes on calcium (Ca), phosphorus (P), magnesium (Mg), sodium (Na) and potassium (K) metabolism in singleton and twin-pregnant dairy goats. The 42 goats used (49.5 kg±7.6 body weight [BW]) were assigned at random to treatments that were factorially arranged to account for 2 breeds (Oberhasli and Saanen), 2 pregnancy types (singleton and twin) and 3 gestation periods (80, 110, and 140 days). Digestibility trials were performed at 80, 110, and 140 days of gestation. Mineral retention during pregnancy was determined in the maternal body, femur, uterus, mammary gland, fetus and fetal fluid. Blood samples were taken during pregnancy before and after a meal, and Ca, P, Mg, Na, K ions and alkaline phosphatase activity determined in serum. Bone mineral density was determined in the right femur. Statistical analyses were performed using the SAS MIXED procedure. Dry matter intake decreased linearly up to 140 days of gestation. Maternal BW gain, and Ca, P, and Mg retention (g/kg) decreased linearly with the advance of gestation days. Macromineral retention in maternal body (g/kg) was greater in Oberhasli than Saanen goats, and their fetuses had higher Ca, P, and Mg deposition (mg/g). Mineral retention (mg/g) increased in fetuses according to pregnancy development, with no differences between singleton and twin pregnancy. In the mammary gland, the retention of all minerals (g) increased with the days of pregnancy. In conclusion, related to Ca, P, and Mg metabolism can be divided into two stages. Up to 80 days of gestation, was characterized by the preparation of the maternal body reserves for future mineral demands. From 80 days of gestation onward, was characterized by the transfer of maternal body reserves for fetal development and colostrum production. Na and K supply was provided by adjustments in endogenous excretion and an increase in intestinal absorption. Finally, mineral metabolism was specific to each genotype and, except for Na, was not affected by the number of fetuses.
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Mineral Metabolism in Singleton and Twin-pregnant Dairy Goats
Harter, C.J.,Castagnino, D.S.,Rivera, A.R.,Lima, L.D.,Silva, H.G.O.,Mendonca, A.N.,Bonfim, G.F.,Liesegang, A.,St-Pierre, N.,Teixeira, I.A.M.A. Asian Australasian Association of Animal Productio 2015 Animal Bioscience Vol.28 No.1
During pregnancy, the maternal body undergoes significant physiological changes. The present study assessed the changes on calcium (Ca), phosphorus (P), magnesium (Mg), sodium (Na) and potassium (K) metabolism in singleton and twin-pregnant dairy goats. The 42 goats used ($49.5kg{\pm}7.6$ body weight [BW]) were assigned at random to treatments that were factorially arranged to account for 2 breeds (Oberhasli and Saanen), 2 pregnancy types (singleton and twin) and 3 gestation periods (80, 110, and 140 days). Digestibility trials were performed at 80, 110, and 140 days of gestation. Mineral retention during pregnancy was determined in the maternal body, femur, uterus, mammary gland, fetus and fetal fluid. Blood samples were taken during pregnancy before and after a meal, and Ca, P, Mg, Na, K ions and alkaline phosphatase activity determined in serum. Bone mineral density was determined in the right femur. Statistical analyses were performed using the SAS MIXED procedure. Dry matter intake decreased linearly up to 140 days of gestation. Maternal BW gain, and Ca, P, and Mg retention (g/kg) decreased linearly with the advance of gestation days. Macromineral retention in maternal body (g/kg) was greater in Oberhasli than Saanen goats, and their fetuses had higher Ca, P, and Mg deposition (mg/g). Mineral retention (mg/g) increased in fetuses according to pregnancy development, with no differences between singleton and twin pregnancy. In the mammary gland, the retention of all minerals (g) increased with the days of pregnancy. In conclusion, related to Ca, P, and Mg metabolism can be divided into two stages. Up to 80 days of gestation, was characterized by the preparation of the maternal body reserves for future mineral demands. From 80 days of gestation onward, was characterized by the transfer of maternal body reserves for fetal development and colostrum production. Na and K supply was provided by adjustments in endogenous excretion and an increase in intestinal absorption. Finally, mineral metabolism was specific to each genotype and, except for Na, was not affected by the number of fetuses.
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