Modifiers Elements
Mostrando 1-12 de 14 artigos, teses e dissertações.
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1. Implementação e aplicação de metodologia para dosagem de metais e não metais em águas de drenagem de solo adubados com fosfogesso
Phosphogysum is a waste generated in phosphoric acid production by the wet process. The immense amount of phosphogysum yearly produced (around 150 million tons) is receiving attention from environmental protection agencies all over the word, given its potential of contamination. In Brazil, this material has been used for many decades, especially for agricult
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/04/2010
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2. Desenvolvimento de métodos para determinações elementares em cimentos por espectrometria de absorção atômica com forno de grafite e amostragem direta de sólidos / Development of methods for elemental determination in cements by atomic absorption spectrometry with graphite furnace and direct solid sampling
The objective of this work was the development of analytical methods for the determination of Cd, Pb, Cu, Ni, Co, Cr e Mn in Portland cement by solid sampling graphite furnace atomic absorption spectrometry. It was not necessary any pretreatment of the samples, because the particles size (12 µm) were apropriated for direct solid analysis. The heating pr
Publicado em: 2008
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3. Evaluation of the mixtures ammonium phosphate/magnesium nitrate and palladium nitrate/magnesium nitrate as modifiers for simultaneous determination of Cd, Cr, Ni and Pb in mineral water by GFAAS
Um método é descrito para a determinação simultânea de Cd, Cr, Ni e Pb em amostras de água mineral por espectrometria de absorção atômica em forno de grafite com um atomizador de grafite aquecido transversalmente (THGA) e um sistema de corretor de fundo por efeito Zeeman longitudinal. O comportamento eletrotérmico dos analitos durante as etapas de
Journal of the Brazilian Chemical Society. Publicado em: 2004-02
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4. Fracture toughness of as-cast high speed steel M2, modified and heat treated. / Estudo da tenacidade à fratura do aço rápido M2 fundido, modificado e tratado termicamente.
Neste trabalho foi medida a tenacidade à fratura de quatro ligas fundidas com composição química base do aço AISI M2 uma de composição química convencional (liga I), e as demais modificadas por adições de nitrogênio (liga II), cério (liga III) e antimônio (liga IV) submetidas a tratamentos térmicos visando a decomposição do carboneto M2
Publicado em: 2001
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5. ATOMIC FLUORESCENCE SPECTROSCOPIC METHODS FOR ULTRATRACE ELEMENTAL ANALYSIS USING A HIGH- REPETITION RATE TUNABLE DYE LASER AND FURNACE SAMPLE ATOMIZATION
The goal of this work was to develop ultrasensitive methods based on Electrothermal atomization laser-excited atomic fluorescence (ETA-LEAFS) to determine Ge, In, Pb, Pt and Tm in complex samples such as biological and environmental. The ultimate goal was to achieve high sensitivity and high selectivity with little sample manipulation and simple sample calib
Publicado em: 1999
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6. Estudo de modificadores quimicos e superficies modificadas para a determinação de estanho por espectrometria de absorção atomica com forno de grafite
Tin is an important element from an environmental viewpoint and is essential for humans at trace levels. However, the direct determination of tin by graphite furnace AAS has been fraught with problems such as volatilization loss, interaction with the graphite surface and sample matrix interference. In the present work, the use of the calcium, barium and stro
Publicado em: 1997
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7. Examination of a Mutable System Affecting the Components of the Segregation Distorter Meiotic Drive System of Drosophila Melanogaster
Segregation distortion in Drosophila melanogaster is the result of an interaction between the genetic elements Sd, a Rsp sensitive to Sd, and an array of modifiers, that results in the death of sperm carrying Rsp. A stock (designated M-5; cn bw) has been constructed which has the property of inducing the partial loss of sensitivity from previously sensitive
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8. The Molecular through Ecological Genetics of Abnormal Abdomen in DROSOPHILA MERCATORUM. I. Basic Genetics
The abnormal abdomen syndrome (aa) in Drosophila mercatorum is characterized by the persistence of juvenilized cuticle on the adult abdomen. The aa phenotype is shown to depend on at least two X-linked genetic elements that are about one map unit apart near the centromeric end of the X chromosome. These two genetic elements are necessary for aa expression; o
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9. R-Stippled Maize as a Transposable Element System
The I-R element at the R locus destabilizes kernel pigmentation giving the variegated pattern known as stippled ( R-st). In trans linkage phase with R-st the element was shown to act as a modifier of stippled, intensifying seed spotting in parallel with effects of the dominant linked modifier M-st. Presence of I-R in the genome was, therefore, shown to be de
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10. Trans-Suppression of Terminal Deficiency-Associated Position Effect Variegation in a Drosophila Minichromosome
Position effect variegation (PEV) is the clonal inactivation of euchromatic or heterochromatic genes that are abnormally positioned within a chromosome. PEV can be influenced by modifiers in trans, including single gene mutations and the total amount of heterochromatin present in the genome. Terminal deletions of a Drosophila minichromosome (Dp1187) dramatic
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11. Ectopic HP1 promotes chromosome loops and variegated silencing in Drosophila
A transgene inserted in euchromatin exhibits mosaic expression when targeted by a fusion protein made of the DNA-binding domain of GAL4 and the heterochromatin-associated protein HP1. The silencing responds to the loss of a dose of the dominant modifiers of position-effect variegation Su(var)3-7 and Su(var)2-5, the locus encoding HP1. The genomic environs of
Oxford University Press.
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12. The Lighten up (Lip) Gene of Drosophila Melanogaster, a Modifier of Retroelement Expression, Position Effect Variegation and White Locus Insertion Alleles
We are interested in identifying single gene mutations that are involved in trans-acting dosage regulation in order to understand further the role of such genes in aneuploid syndromes, various types of dosage compensation as well as in regulatory mechanisms. The Lighten up (Lip) gene in Drosophila melanogaster was identified in a mutagenic screen to detect d