نتایج جستجو برای: biogenic method
تعداد نتایج: 1637162 فیلتر نتایج به سال:
[1] Submicron atmospheric particles in the Amazon Basin were characterized by a high-resolution aerosol mass spectrometer during the wet season of 2008. Patterns in the mass spectra closely resembled those of secondary-organicaerosol (SOA) particles formed in environmental chambers from biogenic precursor gases. In contrast, mass spectral indicators of primary biological aerosol particles (PBAP...
Numerous studies have been reported concerning the role of monoamine oxidase (MAO) in the metabolism of biogenic amines, especially in the central nervous system and in the heart. A large number of compounds that inhibit MAO have been described, and some of these have been used therapeutically. For this reason we considered that differences in concentration and localization of the enzyme might ...
Electron backscatter diffraction (EBSD) is becoming a widely used technique to determine crystallographic orientation in biogenic carbonates. Despite this use, there is little information available on preparation for the analysis of biogenic carbonates. EBSD data are compared for biogenic aragonite and calcite in the common blue mussel, Mytilus edulis, using different types of resin and thickne...
Biogenic amine defects constitute a complex and expanding group of neurotransmitter disorders affecting cognitive, motor and autonomic system development, mostly in the pediatric age. In recent years different enzymatic defects have been identified impairing the tetrahydrobiopterin cofactor pathway and/or biogenic amine synthesis, catabolism and transport, with subsequent new disease entities d...
3.7 Billion year old inclusions inside garnet crystals contain 13C depleted carbonaceous material consistent with biogenic origin. Additional evidence in the form of the other elements of life mainly O, N and P were found to be structural bound to this material by using a new technique, AFM-IR. Here we show additional evidence that support our claim. By overlaying maps generated by the AFM-IR w...
The objectives of the project were to improve our understanding of trace element behaviour in biogenic minerals via Laser Ablation Inductively Coupled Plasma Mass Spectrometer (LA-ICP-MS) analysis. Indeed, it is well known that biogenic carbonates continuously record environmental conditions such as temperature, salinity and also pollutant level and thus represent potential archives of environm...
Serendipity has long been a welcome yet elusive phenomenon in the advancement of chemistry. We sought to exploit serendipity as a means of rapidly identifying unanticipated chemical transformations. By using a high-throughput, automated workflow and evaluating a large number of random reactions, we have discovered a photoredox-catalyzed C-H arylation reaction for the construction of benzylic am...
[formula: see text] Hexahydrodipyrrins 15 (X=H2) have been prepared by two routes: Pd(0)-initiated coupling/cyclization of triflates 11 and alkyne amines 12 and reduction of semicorrins 26 (X=O).
Biogenic isoprene emission rates modelling C. Boissard et al.
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