Ž . Although dissimilatory iron reducing bacteria DIRB are capable of reducing a number of metals in oxides and soluble forms, the factors controlling the raterextent of magnetite reduction and the nature of the mineral products resulting from magnetite reduction are not well understood. This study was carried out to investigate mechanisms and biogeochemical processes occurring during magnetite...

the use of biogenic selenium nanoparticles for various purposes is going to be an issue of considerable importance; thus, appropriate simple methods should be developed and tested for the synthesis and recovery of these nanoparticles. in this study, a fungus was isolated from a soil sample, identified as aspergillus terreus and used for extracellular synthesis of selenium nanoparticles (se nps)...

While current trends in Green Analytical Chemistry aim at reducing or simplifying sample treatment, food usually comprises complex matrices where direct analysis is not possible most cases. In this context, treatment plays a pivotal role. Biogenic amines are naturally formed many foodstuffs due to the action of microorganisms, while their presence has been associated with adverse health effects...

This work presents a RP-HPLC method for the simultaneous quantification of free amino acids and biogenic amines in liquid food matrices and the results of the application to honey and wine samples obtained from different production processes and geographic origins. The developed methodology is based on a pre-column derivatization with o-phthaldialdehyde carried out in the sample injection loop....

results the results of energy-dispersive x-ray demonstrated that the purified nps consisted of only se. in addition, transmission electron micrographs showed that 120- to 140-nm spherical se nps were the most common. an antifungal assay was performed with a standard clinical and laboratory standards institute broth microdilution method. minimum inhibitory concentration (mic) measurements of the...

Abstract Today bone tissue engineering is one of the most used technologies for treat bones injure. Materials containing hydroxyapatite and graphene have received much attention recently. The aim this study was preparation biogenic bioceramics modified by graphene-like structures investigation effect on structure properties material. Biogenic were successfully prepared chemical vapor deposition...

This study is the first to report on the detection of biogenic amines in an aqueous solution using an organic field-effect transistor (OFET) device with an extended gate electrode modified with a layer of diamine oxidase and a horseradish peroxidase osmium-redox polymer. The limit of detection (LOD) for histamine was estimated to be 1.2 μM. These results reveal that extended-gate type OFET devi...

Can we detect life on an unresolved Earth-like extrasolar planet? Future space missions will provide us with the first images and low-resolution spectra of exoEarths, and the question of the presence of biogenic spectral signatures in these data will undoubtedly feed an animated debate. Our only reference point at present is our own planet. In this lab you will measure the integrated spectrum o...

This manuscript includes findings from field and numerical modeling investigations designed to quantify the degree and rates of biogenic hydrocarbon chemical processing within and above a mixed deciduous forest in the southeastern United States. The study site was under the influences of nitrogen oxide and hydrocarbon emissions from suburban automobile traffic. The most common ambient biogenic ...

Magnetite Fe3O4 is one of the most stable carriers of natural remanent magnetization (NRM) in sedimentary rocks, and paleomagnetic studies of magnetite-bearing sediments, such as deep-sea cores and pelagic limestones, have provided a detailed calibration between the biostratigraphic and magnetic polarity time scales. Despite this important role, there is as yet a very poor understanding of how ...