کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5162523 | 1502270 | 2016 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Occurrence of unsaturated C25 highly branched isoprenoids (HBIs) in a freshwater wetland
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Occurrence of unsaturated C25 highly branched isoprenoids (HBIs) in a freshwater wetland Occurrence of unsaturated C25 highly branched isoprenoids (HBIs) in a freshwater wetland](/preview/png/5162523.png)
چکیده انگلیسی
Eight C25 highly branched isoprenoid (HBI) alkenes were detected in the freshwater wetland of the Florida Everglades and tentatively assigned as a C25 diene, three C25 trienes, two C25 tetraenes and two C25 pentaenes based on their mass spectra, retention index and literature reports. One diene and one triene were observed more frequently than the others. The HBIs were present in varying amount of up to 1000, 19,000, 780 and 150 ng/g dry weight in the periphyton, floc, surface soils and deeper soils (ca. 1900 AD), respectively. Compound specific carbon isotope analysis of the two most dominant HBIs (one diene and one triene) showed them to be highly depleted in 13C (δ13C â40.0â° to â38.5â°) in freshwater floc, suggesting recycled CO2 produced from the decomposition of organic matter as an important C source in the biosynthesis of these compounds. HBIs were present across this freshwater wetland in greater diversity and abundance at locations with higher surface water N concentration and longer hydroperiod (inundation). Historical variation in the occurrence of the HBIs in soil cores from multiple slough and ridge environments was assessed. Their increased abundance after ca. 1960 AD in almost all cores suggests proliferation of their precursor biota (freshwater diatoms) over the past five decades.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Organic Geochemistry - Volume 93, March 2016, Pages 59-67
Journal: Organic Geochemistry - Volume 93, March 2016, Pages 59-67
نویسندگان
Ding He, Bernd R.T. Simoneit, Yunping Xu, Rudolf Jaffé,