53 research outputs found
FEM modeling of magnetic microwire and its using for stress monitoring inside the composite beam
The proposed article is devoted to the stress evaluation inside the composite beam using the embedded magnetic microwire sensors. The interlaminar stresses with high values can occur inside the composite structures during the operation. It is essential to monitor the stresses and to increase the lifetime of the composite materials by prediction using the research results from the stress distribution estimation and also during the operation using the embedded magnetic microwire-based sensors. In the article the results of the mechanical stress distribution between the magnetic microwire coating and core and the discussion about the experimental application of the magnetic microwire inside the composite beam are presented
Aquarium Nitrification Revisited: Thaumarchaeota Are the Dominant Ammonia Oxidizers in Freshwater Aquarium Biofilters
Ammonia-oxidizing archaea (AOA) outnumber ammonia-oxidizing bacteria (AOB) in many terrestrial and aquatic environments. Although nitrification is the primary function of aquarium biofilters, very few studies have investigated the microorganisms responsible for this process in aquaria. This study used quantitative real-time PCR (qPCR) to quantify the ammonia monooxygenase (amoA) and 16S rRNA genes of Bacteria and Thaumarchaeota in freshwater aquarium biofilters, in addition to assessing the diversity of AOA amoA genes by denaturing gradient gel electrophoresis (DGGE) and clone libraries. AOA were numerically dominant in 23 of 27 freshwater biofilters, and in 12 of these biofilters AOA contributed all detectable amoA genes. Eight saltwater aquaria and two commercial aquarium nitrifier supplements were included for comparison. Both thaumarchaeal and bacterial amoA genes were detected in all saltwater samples, with AOA genes outnumbering AOB genes in five of eight biofilters. Bacterial amoA genes were abundant in both supplements, but thaumarchaeal amoA and 16S rRNA genes could not be detected. For freshwater aquaria, the proportion of amoA genes from AOA relative to AOB was inversely correlated with ammonium concentration. DGGE of AOA amoA genes revealed variable diversity across samples, with nonmetric multidimensional scaling (NMDS) indicating separation of freshwater and saltwater fingerprints. Composite clone libraries of AOA amoA genes revealed distinct freshwater and saltwater clusters, as well as mixed clusters containing both freshwater and saltwater amoA gene sequences. These results reveal insight into commonplace residential biofilters and suggest that aquarium biofilters may represent valuable biofilm microcosms for future studies of AOA ecology
Elderly women with metabolic syndrome present higher cardiovascular risk and lower relative muscle strength
Application of hierarchical oligonucleotide primer extension (HOPE) to assess relative abundances of ammonia- and nitrite-oxidizing bacteria
Lessons from the business sector for successful knowledge management in health care: A systematic review
Numerical approach in aeroelasticity
Aircraft wing design processes should comprise specific analyses oriented towards aeroelasticity, which is one of the essential factors determining flight envelope boundaries. For such cases, static or dynamic aeroelastic phenomena can be simulated using CFD simulation software. ANSYS software offers the fluid structure interaction (FSI) method for solving this multiphysics problem
First case of SARS-COV-2 sequencing in cerebrospinal fluid of a patient with suspected demyelinating disease
Organic Carbon Amendments for Enhanced Biological Attenuation of Trace Organic Contaminants in Biochar-Amended Stormwater Biofilters
This study sought to evaluate how
dissolved organic carbon (DOC)
affects attenuation of trace organic contaminants (TOrCs) in biochar-amended
stormwater biofilters. It was hypothesized that (1) DOC-augmented
runoff would demonstrate enhanced TOrC biodegradation and (2) biochar-amended
sand bearing DOC-cultivated biofilms would achieve enhanced TOrC attenuation
due to sorptive retention and biodegradation. Microcosm and column
experiments were conducted utilizing actual runoff, DOC from straw
and compost, and a suite of TOrCs. Biodegradation of TOrCs in runoff
was more enhanced by compost DOC than straw DOC (particularly for
atrazine, prometon, benzotriazole, and fipronil). 16S rRNA gene quantification
and sequencing revealed that growth-induced microbial community changes
were, among replicates, most consistent for compost-augmented microcosms
and least consistent for raw runoff microcosms. Compost DOC most robustly
enhanced utilization of TOrCs as carbon substrates, possibly due to
higher residual nutrient levels upon TOrC exposure. Sand columns containing
just 0.5 wt % biochar maintained sorptive TOrC retention in the presence
of compost-DOC-cultivated biofilms, and TOrC removal was further enhanced
by biological activity. Overall, these results suggest that coamendment
with biochar and compost may robustly enhance TOrC attenuation in
stormwater biofilters, a finding of significance for efforts to mitigate
the impacts of runoff on water quality
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