Biogenic Structures
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. Estudos das características técnicas e operacionais das galerias de águas pluviais como subsídios para gestão patrimonial e estabelecimento de diretrizes para projetos de sistemas de drenagem urbana
The purpose of this work is to study the emergence and evolution of pathological manifestations in urban stormwater channels and relate them to technical and operational characteristics of concrete structures so that plans for urban drainage systems management are developed, as well as new concepts for stormwater channel projects. The main reference is the D
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/04/2012
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2. Estruturas biogênicas em latossolos de chapadões, Uberlândia MG / Biogenic structures in Oxisols of Chapadões, Uberlândia, MG
The biological activity in soil can interfere enough on its morphology, particularly in the structure as to be considered in the classification system developed soils (Soil Taxonomy). In tropical conditions the magnitude of the effects of biological activity in soil is even greater. However, morphological characteristics of biogenic nature has not been taken
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/02/2012
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3. Vivianite and siderite in lateritic iron crust: an example of bioreduction
Lateritic iron crust (LIC) samples from Padauari (AM) were analysed by XRD, optical microscopy and SEM-EDS. The equilibrium of iron minerals (IM) was studied using Eh-pH diagram. It was shown that the minerals of the LIC are goethite (alpha-FeOOH), vivianite [Fe3(PO4)2.8H2O] and siderite (FeCO3). Carbonate grains are a solid solution of FeCO3-MnCO3. The LIC
Química Nova. Publicado em: 2007-02
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4. Influencia de compostos carboxilicos e ions metalicos na degradação de neurotransmissores / Influence of carboxylate and metal ions on the degradation of neurotransmitters
Several neurological disorders are associated with improper catechoalmine regulation in the brain. Numerous researches have indicated that metallic ions can induce oxidative stress-dependent neurodegeneration of dopamine, and are responsible for the induction of neurodegenerative diseases. In previous work was verified that some carboxylates diminishes the o
Publicado em: 2007
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5. Changes in the biogenic amine content of the prefrontal cortex, amygdala, dorsal hippocampus, and nucleus accumbens of rats submitted to single and repeated sessions of the elevated plus-maze test
It has been demonstrated that exposure to a variety of stressful experiences enhances fearful reactions when behavior is tested in current animal models of anxiety. Until now, no study has examined the neurochemical changes during the test and retest sessions of rats submitted to the elevated plus maze (EPM). The present study uses a new approach (HPLC) by l
Brazilian Journal of Medical and Biological Research. Publicado em: 2005-12
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6. Methane production in terrestrial arthropods.
We have screened more than 110 representatives of the different taxa of terrestrial arthropods for methane production in order to obtain additional information about the origins of biogenic methane. Methanogenic bacteria occur in the hindguts of nearly all tropical representatives of millipedes (Diplopoda), cockroaches (Blattaria), termites (Isoptera), and s
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7. Enzymatic Manganese(II) Oxidation by Metabolically Dormant Spores of Diverse Bacillus Species
Bacterial spores are renowned for their longevity, ubiquity, and resistance to environmental insults, but virtually nothing is known regarding whether these metabolically dormant structures impact their surrounding chemical environments. In the present study, a number of spore-forming bacteria that produce dormant spores which enzymatically oxidize soluble M
American Society for Microbiology.
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8. Self-assembling amphiphilic molecules: Synthesis in simulated interstellar/precometary ices
Interstellar gas and dust constitute the primary material from which the solar system formed. Near the end of the hot early phase of star and planet formation, volatile, less refractory materials were transported into the inner solar system as comets and interplanetary dust particles. Once the inner planets had sufficiently cooled, late accretionary inf
The National Academy of Sciences.
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9. Magnetite biomineralization in the human brain.
Although the mineral magnetite (Fe3O4) is precipitated biochemically by bacteria, protists, and a variety of animals, it has not been documented previously in human tissue. Using an ultrasensitive superconducting magnetometer in a clean-lab environment, we have detected the presence of ferromagnetic material in a variety of tissues from the human brain. Magn