نتایج جستجو برای: pristine environment
تعداد نتایج: 523838 فیلتر نتایج به سال:
Ultramicroelectrodes (UMEs) are electrochemical working electrodes with at least one dimension less than 25 μm. Here, we demonstrate a method to fabricate pristine (contamination and doping-free) monolayer graphene UMEs characterise its properties. Graphene is particularly sensitive both contamination from device fabrication doping the substrate, these effects detrimental accurate measurements ...
Terminal restriction fragment length polymorphism and 16S rRNA gene sequencing were used to explore the community composition of bacterial communities in biofilms on sediments (epipssamon) and rocks (epilithon) in stream reaches that drain watersheds with contrasting lithologies in the Noatak National Preserve, Alaska. Bacterial community composition varied primarily by stream habitat and secon...
Solid-state nanopores have emerged as a versatile tool for the characterization of single biomolecules such as nucleic acids and proteins. However, the creation of a nanopore in a thin insulating membrane remains challenging. Fabrication methods involving specialized focused electron beam systems can produce well-defined nanopores, but yield of reliable and low-noise nanopores in commercially a...
Herein, polybenzoxazine based cross-linked cellulose acetate nanofibrous membrane exhibiting enhanced thermal/mechanical properties and improved adsorption efficiency was successfully produced via electrospinning and thermal curing. Initially, suitable solution composition was determined by varying the amount of the benzoxazine (BA-a) resin, cellulose acetate (CA) and citric acid (CTR) to obtai...
Accelerated glacier melt and runoff may lead to inputs of labile dissolved organic matter (DOM) downstream ecosystems stimulate the associated biogeochemical processes. However, still little is known about glacial DOM composition its processing before entering ocean, although function in food webs largely depends on composition. Here, we employ a set molecular optical techniques (UV–vis absorpt...
The Amazon is one of the few continental regions where atmospheric aerosol particles and their effects on climate are not dominated by anthropogenic sources. During the wet season, the ambient conditions approach those of the pristine pre-industrial era. We show that the fine submicrometer particles accounting for most cloud condensation nuclei are predominantly composed of secondary organic ma...
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