Incorporation studies of NH+ 4 during incubation of organic residues by l5 N-CPMAS-NMR-spectroscopy
نویسندگان
چکیده
منابع مشابه
Elemental quantitation of natural organic matter by CPMAS 13C NMR spectroscopy.
Cross-polarized magic-angle-spinning NMR (CPMAS-NMR) techniques are assumed to be only semi-quantitative in the assessment of carbon distribution in humic substances or natural organic matter, due to a number of interferences such as spinning side bands (SSB) in spectra, paramagnetic species in samples, and low or remote protonation of aromatic carbons. Fast rotor spin rates or direct polarizat...
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I. MORIER , P. SCHLEPPI , R. SIEGWOLF , H. KNICKER & C. GUENAT Swiss Federal Institute of Technology (EPFL), ISTE Institute, ECOS-WSL, Station 2, GR, CH-1015, Lausanne, Switzerland, Swiss Federal Institute for Forest, Snow and Landscape Research (WSL), Forest Ecosystem Process Unit, CH-8903, Birmensdorf, Switzerland, Paul Scherrer Institut (PSI), Laboratory of Atmospheric Chemistry, CH-5332, Vi...
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1. to determine whether difference in birth body mass influenced growth performance in pipistrellus kuhlii we studied a total of 12 captive-born neonates. bats were assigned to two body mass groups: light birth body mass (lbw: 0.89 ± 0.05, n=8) and heavy birth body mass (hbw: 1.35 ± 0.08, n=4). heavier body mass at birth was associated with rapid postnatal growth (body mass and forearm length) ...
Structural studies of amphiphilic oligopeptides composed of alternating alanine and ionizable amino-acid residues using CD and 13C CPMAS NMR spectroscopy
We report a novel self-assembling system of amphiphilic oligopeptides composed of alternating hydrophobic and ionizable amino-acid residues. Three types of peptides, AD12, AE12 and AK12, were prepared as building blocks for this model system. These peptides formed helical conformations in low-concentration solutions, but these peptides adopted b-sheet structures and precipitated in highly conce...
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در این پایان نامه، درهمتنیدگی بین یک سیستم نقطه کوانتومی دوگانه(مولکول نقطه کوانتومی) و میدان مورد مطالعه قرار گرفته است. از آنتروپی ون نیومن به عنوان ابزاری برای بررسی درهمتنیدگی بین اتم و میدان استفاده شده و تاثیر پارامترهای مختلف، نظیر تونل زنی(که توسط تغییر ولتاژ ایجاد می شود)، شدت میدان و نسبت دو گسیل خودبخودی بر رفتار درجه درهمتنیدگی سیستم بررسی شده اشت.با تغییر هر یک از این پارامترها، در...
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ژورنال
عنوان ژورنال: European Journal of Soil Science
سال: 1997
ISSN: 1351-0754
DOI: 10.1111/j.1365-2389.1997.tb00209.x