Results 11 to 20 of about 12,654 (257)

Soil pH and aridity influence distributions of branched tetraether lipids in grassland soils along an aridity transect [PDF]

, 2022
Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are membrane lipids of certain soil bacteria, and their relative distributions are used as a proxy for air temperature and soil pH.
Guo, Jingjing, Liu, Nana, Peterse, Francien, Zhang, Xinying, Ma, Wenhong, Organic geochemistry & molecular biogeology, Feng, Xiaojuan, Wang, Zhiheng, Hu, Huifeng, Organic geochemistry, Ma, Tian   +10 more
core   +1 more source

Calibrating the glycerol dialkyl glycerol tetraether temperature signalin speleothems [PDF]

, 2013
Palaeotemperature proxies based on glycerol dialkyl glycerol tetraethers (GDGTs) lipids have been established for marine and lacustrine environments, but there has been relatively little study of their application in speleothems. In this study we analyse
Organic geochemistry & molecular biogeology, Blyth, Alison, Blyth, A.J., Schouten, S., Organic geochemistry   +4 more
core   +1 more source

Charred olive stones: experimental and archaeological evidence for recognizing olive processing residues used as fuel [PDF]

, 2016
After extracting oil from olives a residue is left usually referred to as the olive oil processing residue (OPR). This study explores the way in which ancient societies may have used OPR as fuel for fires to generate heat and the various issues that are ...
Sarpaki, A., Organic geochemistry & molecular biogeology, Organic geochemistry, Marinova, E., Braadbaart, Freek   +4 more
core   +1 more source

C₂₇-C₃₀ neohop-13(18)-enes and their saturated and aromatic derivatives in sediments: Indicators for diagenesis and water column stratification [PDF]

, 2014
A limited suite of C-27, C-29 and C-30 rearranged hopenes identified as neohop-13(18)-enes have been reported in immature Recent and ancient marine/lacustrine sediments and their presence has been explained by dehydration and isomerisation of ubiquitous ...
Organic geochemistry & molecular biogeology, Volkman, J.K., Schouten, S., Organic geochemistry, Sinninghe Damsté, J.S.   +4 more
core   +1 more source

Biogeochemical consequences of vertical and lateral transport of particulate organic matter in the southern North Sea: A multiproxy approach [PDF]

, 2015
Vertical and lateral transports are of importance in continental shelf systems such as the North Sea andplay a major role in the processing of organic matter.
Middelburg, J.J., Organic geochemistry & molecular biogeology, Geochemistry, Organic geochemistry, Sinninghe Damsté, J.S., Le Guitton, M., Soetaert, K.   +6 more
core   +1 more source

Compound-specific stable isotope analysis of nitrogen-containing intact polar lipids [PDF]

, 2015
Rationale Compound-specific isotope analysis (CSIA) of nitrogen in amino acids has proven a valuable tool in many fields (e.g. ecology). Several intact polar lipids (IPLs) also contain nitrogen, and their nitrogen isotope ratios have the potential to ...
Sinninghe Damsté, Jaap S., Schouten, Stefan, Svensson, Elizabeth, Organic geochemistry & molecular biogeology, Geochemistry, Organic geochemistry, Stam, Axel, Middelburg, Jack J.   +7 more
core   +1 more source

Links between microbial biomass and necromass components in the top- and subsoils of temperate grasslands along an aridity gradient [PDF]

, 2020
Microbial carbon has recently been highlighted to play a key role in the formation and persistence of soil organic carbon, bearing significant implications for regulating ecosystem carbon stocks under global changes.
Peterse, Francien, Ma, Wenhong, Organic geochemistry & molecular biogeology, Feng, Xiaojuan, Wang, Zhiheng, Organic geochemistry, Peterse, F., Liu, Nana, Zhang, Xinying, Hu, Huifeng, Ma, Tian, Zhang, Jin-Bo, Dai, Guohua   +12 more
core   +1 more source

High Tree Species Diversity Promotes Thermal Enhancement Response of Microbial Carbon Use Efficiency

Advanced Science, EarlyView.
ABSTRACT Predicting soil carbon dynamics under warming is constrained by limited understanding of microbial thermal adaptation, particularly whether microbial carbon use efficiency (CUE) can adapt to warming and how plant diversity modulates this response. Using soils from a natural tree species diversity gradient in a subtropical forest, we combined a
Pengpeng Duan, Changqing Ye, Xinyi Yang, Chaoqun Wang, Wolfgang Wanek, Jian‐sheng Ye, Hongzhao Yuan, Hu Du, Kongcao Xiao, Xunyang He, Kelin Wang, Dejun Li   +11 more
wiley   +1 more source

Green and sustainable synthesis of magnetite from copper slag via citrate complexation for methylene blue dye removal from water

The Canadian Journal of Chemical Engineering, EarlyView.
Abstract This study proposes a novel, green, and sustainable method for synthesizing magnetic iron oxides from metallurgical copper slag (CS), leveraging its iron content as a valuable resource. Iron was extracted via acid leaching using edible citric acid (ECA), forming a citrate–iron complex (CSL), which was subsequently thermally decomposed at 300°C
Melisa Portilla‐Sangabriel, Karen Valencia García, Tania‐Ariadna García‐Mejía, Agileo Hernández‐Gordillo, Rosa‐María Ramírez‐Zamora   +4 more
wiley   +1 more source

An assessment of stress and production rate of sucker rod heat pipes in oil well pumping system

Deep Underground Science and Engineering, EarlyView.
The sucker rod pumping system is the preferred oil extraction technique. The concept about equipping the hollow vacuum space in solid sucker rods with heat pipe has been scrutinized in terms of stress and oil production evaluation. Abstract The implementation of the heat pipe concept in sucker rods for oil pumping systems negates the requirement for an
R. S. Anand, Ang Li, Wenbo Huang, Juanwen Chen, Qingshan Ma, Fangming Jiang   +5 more
wiley   +1 more source