Alpha Spectrometer
Mostrando 1-12 de 14 artigos, teses e dissertações.
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1. Biological activities and phytochemical profile of Passiflora mucronata from the Brazilian restinga
ABSTRACT In general, Passiflora species have been reported for their folk medicinal use as sedative and anti-inflammatory. However, P. caerulea has already been reported to treat pulmonary diseases. Severe pulmonary tuberculosis, generally caused by Mycobacterium tuberculosis strains resistant to multiple drugs, can lead to deleterious inflammation and high
Rev. bras. farmacogn.. Publicado em: 2017-12
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2. Triterpenes from the Protium heptaphyllum resin - chemical composition and cytotoxicity
Protium heptaphyllum (Aubl) Marchand, Burseraceae, is popularly used as an analgesic and anti-inflammatory agent. However, the cellular mechanism of action remains unknown. This study aims to evaluate the chemical composition of P. heptaphyllum resin and cytotoxicity on a breast cancer cell line (MCF-7). The chemical composition of the resin was determined b
Rev. bras. farmacogn.. Publicado em: 2014-08
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3. Determinação de isótopos de Urânio e Tório e Polônio em perfis de sedimento da Baixada Santista, SP / Determination of uranium and thorium isotopes and polonium in sediment profiles from Baixada Santista, SP
O objetivo do presente trabalho é determinar a concentração de atividade de isótopos de ocorrência natural de urânio e tório e o polônio em perfis de sedimento marinho da Baixada Santista. A Baixada Santista é uma região populosa e abrange os municípios de Bertioga, Guarujá, Santos, São Vicente, Cubatão, Praia Grande, Mongaguá, Itanhaém e Per
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/11/2010
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4. Influência do pré-aquecimento e do modo de ativação na resistência máxima à tração e no grau de conversão de dois cimentos resinosos de dupla ativação.
This study evaluated the degree of conversion (DC) using Fourier transformed infrared analysis (FTIR) and ultimate tensile strength (UTS) of pre-heated dual-cured resin cements (RCs) exposed to different activating modes: light-activation through a glass slide (GS) or through a pre-cured 2-mm thick resin composite disc (A2 - A2 shade), or specimens were allo
Publicado em: 2010
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5. Medida da contaminação radioativa do ar ambiental por radonio-222 e filhos em residencias de Campinas-SP, Brasil
In this work we have employed for the first time a Monitoring Methodology, developed by our research group, to study Radon-222 ( 222Rn) and daughters environmental contamination. We carried out a survey in Campinas-SP, Brazil, exposing in the same rooms of 70 dwellings plastic detectors (CR-39) during two successive periods of 6 months: the first one from No
Publicado em: 2000
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6. Globin chain synthesis in the alpha thalassemia syndromes
Whole blood samples of patients with various forms of alpha thalassemia including hemoglobin H disease, alpha thalassemia trait, and the “silent carrier” state were incubated with leucine-14C for definition of relative rates of production of alpha and beta chains in these disorders. The chains were separated by carboxymethyl cellulose chromatography in t
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7. 31P nuclear magnetic resonance studies of glycogen phosphorylase from rabbit skeletal muscle: ionization states of pyridoxal 5'-phosphate.
31P nuclear magnetic resonance (NMR) at 72.8 MHZ has been used to study glycogen phosphorylase from rabbit muscle (1,4-alpha-D-glucan:orthophosphate alpha-glucosyltransferase, EC 2.4.1.1) at concentrations as low as 25 mg/ml, using a WH-180 wide-bore superconducting spectrometer. The use of a thio analogue for 5'-AMP and arsenate for inorganic phosphate allo
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8. Nature of O2 and CO binding to metalloporphyrins and heme proteins.
The O2 vibration of dioxygen adducts of Fe and Co model complexes of alpha,alpha,alpha,alpha-tetrapivalamidophenylporphyrin ("picket fence" porphyrin, TpivPP) with 1-methylimidazole and 1-tritylimidazole as axial bases are reported, obtained with difference techniques between 16O2, 18O2, 169-18O, and NO with a Fourier transform infrared spectrometer. Assignm
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9. Structural studies of the serotype-f polysaccharide antigen from Streptococcus mutans OMZ175.
The serotype f antigen of Streptococcus mutans has been described as a rhamnose-glucose polysaccharide associated with the bacterial cell wall. In this study, the structure of serotype f polysaccharide was examined by analyses of the methylated derivatives of the antigen and the periodate-oxidized antigen. Methylated derivatives were characterized with a gas
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10. Production of volatile sesquiterpenes by Fusarium sambucinum strains with different abilities to synthesize trichothecenes.
Twenty-five strains of Fusarium sambucinum grown on wheat kernels were examined for trichothecene production and the synthesis of volatile sesquiterpenes. The volatiles were purged with air and collected on Tenax traps. Adsorbed compounds were eluted from the traps and injected into a gas chromatograph coupled with a mass spectrometer. Ten strains isolated f
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11. C15H24 Volatile Compounds Unique to Aflatoxigenic Strains of Aspergillus flavus
Headspace volatiles from eight strains of Aspergillus flavus (four aflatoxigenic strains and four nonaflatoxigenic strains), grown for 1, 2, 3, 4, 8, and 10 days in submerged cultures, were collected in Tenax GC traps. The traps were desorbed onto a 50-m gas-liquid chromatography capillary column by heat and gas purge from an external direct injector device.
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12. Structure, oligosaccharide structures, and posttranslationally modified sites of the nicotinic acetylcholine receptor.
Using mass spectrometry, we have examined the transmembrane topography of the nicotinic acetylcholine receptor, a five-subunit glycosylated protein complex that forms a gated ion channel in the neuromuscular junction. The primary sequences of the four polypeptide chains making up the acetylcholine receptor from Torpedo californica contain many possible sites