Organic matter sources and their use by bacteria in the sediments of the Altamaha estuary during high and low discharge periods

Organic Matter Sources in the Water Colu

Organic Matter Sources in the Water Column and Sediments of the Hudson River Estuary: the Use of Plant Pigments as Tracers

✍ Thomas S. Bianchi; Stuart Findlay; Rodger Dawson 📂 Article 📅 1993 🏛 Elsevier Science 🌐 English ⚖ 562 KB

Variability in the distribution of lipid

Variability in the distribution of lipid biomarkers and their molecular isotopic composition in Altamaha estuarine sediments: implications for the relative contribution of organic matter from various sources

✍ Wei Shi; Ming-Yi Sun; Marirosa Molina; Robert E. Hodson 📂 Article 📅 2001 🏛 Elsevier Science 🌐 English ⚖ 647 KB

The source and diagenesis of sediment or

The source and diagenesis of sediment organic matter in the upper Pearl River Estuary as indicated by amino sugars

✍ Qunhe Wu, Jiaying Zhang, Renduo Zhang, Ni Xu… 📂 Article 📅 2013 🏛 Springer-Verlag 🌐 English ⚖ 282 KB

Saliva and serum samples were collected

Saliva and serum samples were collected from eight healthy volunteers every two hours during a 26-hour period. Melatonin concentrations were measured by radioimmunoassay after chloroform extraction using radioiodinated melatonin as a tracer. Five of the subjects had high serum melatonin levels at night (peak levels higher than 75 pg/ml); in three subjects the highest serum melatonin concentration was 20-40 pg/ml. All subjects had low levels (P <0.001, was obtained for all detectable value pairs (n= 73). The regression and correlation coefficients were almost equal for the peak values of melatonin and during the rising and descending phases of the secretion patterns. However, no significant correlation was found between low daytime salivary and serum concentrations when calculated separately. In the five high-secretors the melatonin levels in saliva reflected reliably the changes in serum, but in the three low-secretors the correlation between salivary and serum melatonin was not significant. The proportion of melatonin found in saliva decreased with increasing serum melatonin levels. Circadian rhythm parameters were estimated by single cosinor analysis. The acrophases did not differ significantly within a subject in the concomitant measurements of serum and salivary melatonin. The measurements of salivary melatonin levels seem valid for studies on melatonin rhythms, but the melatonin concentrations measured in saliva do not always consistently reflect the absolute concentrations in blood.

✍ Maija-Liisa Laakso; Tarja Porkka-Heiskanen; Aino Alila; Dag Stenberg; Gunnar Joh 📂 Article 📅 1990 🏛 John Wiley and Sons 🌐 English ⚖ 622 KB

MAGNA CARTAThe Great CharterPreamble

📂 Fiction 🌐 English ⚖ 11 KB 👁 18 views