کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1753461 | 1522589 | 2013 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Fossil cutin of Macroneuropteris scheuchzeri (Late Pennsylvanian seed fern, Canada)
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
زمین شناسی اقتصادی
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چکیده انگلیسی
Cutin polymer from compression-preserved specimens of Macroneuropteris scheuchzeri (seed fern, Medullosales) is recorded for the first time. Specimens of basal Cantabrian strata, Sydney Coalfield, Canada, exhibit excellent preservation. The cutin was concentrated by Schulze's process by time-controlled oxidation reaction. Reported are functional-group changes monitored via semi-quantitative Fourier transform infrared (FTIR) spectrometry as a function of cutin concentration in Schulze's solution. Distinct features of the cutin spectrum include intense peaks of ester CO groups, centered at 1730-1715 cmâ 1, and aromatic CC absorption bands at 1640-1645 cmâ 1. Cutin is characterized and differentiated from the corresponding M. scheuchzeri cuticle mainly by the comparatively higher values of CH2/CH3, CO/CC, and the very low values of CHal/CO and CC contribution. Cutin data compare with available semi-quantitative FTIR data from modern L. esculentum cutin, particularly emphasized by CHal/CO ratios whose low value of ca. 0.9 indicates a similar cross-linking degree of the polymeric structure for the fossil and extant taxa.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Coal Geology - Volume 105, January 2013, Pages 137-140
Journal: International Journal of Coal Geology - Volume 105, January 2013, Pages 137-140
نویسندگان
José A. D'Angelo, Paul C. Lyons, Maria Mastalerz, Erwin L. Zodrow,