نتایج جستجو برای: sediments.

تعداد نتایج: 28437  

Journal: :Environmental pollution 2014
Yan Gao Jianjie Fu Lixi Zeng An Li Huijuan Li Nali Zhu Runzeng Liu Aifeng Liu Yawei Wang Guibin Jiang

In this study, 166 surface sediments and 3 sediment cores from the Bohai Sea (BS), Yellow Sea (YS) and East China Sea (ECS) in China were collected to investigate the spatial and temporal distributions and the transport of PFASs. PFASs concentrations in the surface sediments ranged from below detection limit (<LOD) to 2.78 ng g(-1) with an average value of 0.55 ng g(-1) on a dry weight basis (d...

2016
Pierre E. Galand Sabrina Lucas Sonja K. Fagervold Erwan Peru Audrey M. Pruski Gilles Vétion Christine Dupuy Katell Guizien

Disturbance strongly impacts patterns of community diversity, yet the shape of the diversity-disturbance relationship remains a matter of debate. The topic has been of interest in theoretical ecology for decades as it has practical implications for the understanding of ecosystem services in nature. One of these processes is the remineralization of organic matter by microorganisms in coastal mar...

2012
Alan M. Durbin Andreas Teske

Examining the patterns of archaeal diversity in little-explored organic-lean marine subsurface sediments presents an opportunity to study the association of phylogenetic affiliation and habitat preference in uncultured marine Archaea. Here we have compiled and re-analyzed published archaeal 16S rRNA clone library datasets across a spectrum of sediment trophic states characterized by a wide rang...

2014
Lin Cai Ming-Fei Shao Tong Zhang

Here, we report a type strain AST-10 representing a novel species Sulfurimonas hongkongensis within Epsilonproteobacteria, which is involved in marine sedimentary sulfur oxidation and denitrification. Strain AST-10(T) (= DSM 22096(T) = JCM 18418(T)) was isolated from the coastal sediment at the Kai Tak Approach Channel connected to Victoria Harbour in Hong Kong. It grew chemolithoautotrophicall...

2015
Shiue-Lin Li Kenneth H. Nealson

Sulfide is a common product of marine anaerobic respiration, and a potent reactant biologically and geochemically. Here we demonstrate the impact on microbial communities with the removal of sulfide via electrochemical methods. The use of differential pulse voltammetry revealed that the oxidation of soluble sulfide was seen at +30 mV (vs. SHE) at all pH ranges tested (from pH = 4 to 8), while n...

Journal: :Environmental pollution 2014
Ying-heng Fei Baoshan Xing Xiao-yan Li

Marine sediment with an input of particulate organic matter was incubated to simulate the early aging process. On the sediment after various incubation periods, adsorption and desorption tests were conducted for three selected organic micropollutants: bisphenol A (BPA), 17α-ethinyl estradiol (EE2), and phenanthrene (Phe). The results showed significant sediment organic matter (SOM) decompositio...

2014
Juan C. Larrasoaña Qingsong Liu Pengxiang Hu Andrew P. Roberts Pilar Mata Jorge Civis Francisco J. Sierro José N. Pérez-Asensio

Although recent studies have revealed more widespread occurrences of magnetofossils in pre-Quaternary sediments than have been previously reported, their significance for paleomagnetic and paleoenvironmental studies is not fully understood. We present a paleo- and rock-magnetic study of late Miocene marine sediments recovered from the Guadalquivir Basin (SW Spain). Well-defined paleomagnetic di...

2016
Hui-Juan Li Bai-Lu Tang Xuan Shao Bai-Xue Liu Xiao-Yu Zheng Xiao-Xu Han Ping-Yi Li Xi-Ying Zhang Xiao-Yan Song Xiu-Lan Chen

Bacterial extracellular proteases are important for bacterial nutrition and marine sedimentary organic nitrogen degradation. However, only a few proteases from marine sedimentary bacteria have been characterized. Some subtilases have a protease-associated (PA) domain inserted in the catalytic domain. Although structural analysis and deletion mutation suggests that the PA domain in subtilases is...

2016
Eugenio Rastelli Antonio Dell’Anno Cinzia Corinaldesi Mathias Middelboe Rachel T. Noble Roberto Danovaro

Viruses profoundly influence benthic marine ecosystems by infecting and subsequently killing their prokaryotic hosts, thereby impacting the cycling of carbon and nutrients. Previously conducted studies, based on different methodologies, have provided widely differing estimates of the relevance of viruses on benthic prokaryotes. There has been no attempt so far to compare these independent appro...

Journal: :international journal of environmental research 0
a. banas singapore synchrotron light source (ssls), national university of singapore (nus), 5 research link, singapore k. banas singapore synchrotron light source (ssls), national university of singapore (nus), 5 research link, singapore p. yang singapore synchrotron light source (ssls), national university of singapore (nus), 5 research link, singapore h.o. moser iss / anka light source, forschungszentrum karlsruhe, germany, hermann-von-helmholtz- platz 176344 eggenstein-leopoldshafen, germany m.b.h. breese singapore synchrotron light source (ssls), national university of singapore (nus), 5 research link, singapore, physics department, nus, 2 science drive 3, singapore b. kubica institute of nuclear physics pan, ul radzikowskiego 152, 31-342 krakow, poland w.m. kwiatek

x-ray absorption fine structure (xafs) spectroscopy was used to identify directly the metal speciation and local bonding environment of fe in sediments originated from dobczyce reservoir (poland); special attention was paid to analysis of samples collected from points situated at different distances from the land. the combination of traditional approach to data analysis as well as usage of mult...

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