Citrate Buffers
Mostrando 1-12 de 20 artigos, teses e dissertações.
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1. Corrosion behavior of Ti and Ti6A14V in citrate buffers containing fluoride ions
The effect of fluoride ions concentration on the electrochemical behavior of Ti grade 2 and Ti6Al4V in citrate buffers was studied. Open circuit potential (OCP) measurements and voltammetric studies of the samples in the fluoride containing citrate buffers revealed a dissolution process when the pH falls below 5.0 and the NaF content is higher than 0.01 M. H
Publicado em: 2011
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2. Corrosion behavior of Ti and TI6Al4V in citrate buffers containing fluoride ions
The effect of fluoride ions concentration on the electrochemical behavior of Ti grade 2 and Ti6Al4V in citrate buffers was studied. Open circuit potential (OCP) measurements and voltammetric studies of the samples in the fluoride containing citrate buffers revealed a dissolution process when the pH falls below 5.0 and the NaF content is higher than 0.01 M. H
Materials Research. Publicado em: 2010-03
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3. Efeito da concentração do fluoreto sobre o comportamento eletroquímico do Ti e da liga Ti6A14V em tampões citrato
A corrosão do Ti e suas ligas em meio de fluoreto é bem conhecida. O presente trabalho descreve o efeito da concentração dos íons fluoreto no comportamento eletroquímico do Ti grau 2 e da liga Ti6Al4V em tampões citrato. O potencial de corrosão da liga em ácido cítrico contendo 0,1 mol/L NaF e pH 2 apresenta valores relativos a um processo de disso
Publicado em: 2010
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4. PurificaÃÃo parcial de uma lectina da raiz de Guettarda platypoda
Lectins, proteins or glycoproteins that reversible bind carbohydrates with distinct degrees of selectivity, they are found in a variety of organisms being involved in numerous cellular processes. In this work evaluated the presence of lectin(s) from Guettarda platypoda D.C., plant popular know with âangelicaâ. Roots of this plant have been used in folk med
Publicado em: 2003
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5. Viral aggregation: buffer effects in the aggregation of poliovirus and reovirus at low and high pH.
The effects of the buffer employed in maintaining a given pH value were tested on the aggregation of two viruses, poliovirus and reovirus. Poliovirus was found to aggregate at pH values of 6 and below, but not at pH 7 or above, except in borate buffer. Reovirus aggregated at pH 4 and below, but was found to aggregate only in acetate or tris(hydroxymethyl)ami
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6. Suicidal destruction of Helicobacter pylori: metabolic consequence of intracellular accumulation of ammonia.
The role of pH, citrate buffer, and urea were investigated in the suicidal destruction of Helicobacter pylori, with particular reference to the organism's urea and ammonia metabolism. The median five minute survival of H pylori in the presence of 50 mmol/l urea in 0.2 M citrate buffer at pH 6.0 was only 14%, compared with 53% in the same solution at pH 7.0.
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7. Effect of hydroxypropyl methylcellulose and hydrogenated castor oil on naproxen release from sustained-release tablets
The effect of the concentration of hydrophilic (hydroxypropyl methylcellulose [HPMC]) and hydrophobic (hydrogenated castor oil [HCO]) products, fillers (lactose and dibasic calcium phosphate), and buffers (sodium bicarbonate, calcium carbonate, and sodium citrate) on naproxen release rate was studied. Matrix tablets were prepared by double compression, andIn
Springer-Verlag.
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8. Regulation of Renal Citrate Metabolism by Bicarbonate Ion and pH: Observations in Tissue Slices and Mitochondria*
The effect of acid-base balance on the oxidation and utilization of citrate and other organic acids has been studied in tissue slices and isolated kidney mitochondria. The results show that: 1) With bicarbonate-buffered media, citrate oxidation and utilization are inhibited in slices of renal cortex and in kidney mitochondria when [HCO3-] and pH are increase
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9. Partial Purification and Properties of d-Glucosamine 6-Phosphate N-Acetyltransferase from Phaseolus aureus1
d-Glucosamine-6-P N-acetyltransferase (EC 2.3.1.4) from mung bean seeds (Phaseolus aureus) was purified 313-fold by protamine sulfate and isoelectric precipitation, ammonium sulfate and acetone fractionation, and CM Sephadex column chromatography. The partially purified enzyme was highly specific for d-glucosamine-6-P. Neither d-glucosamine nor d-galactosami
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10. Inhibitory effects of titanium (III) citrate on enumeration of bacteria from rumen contents.
Titanium citrate (TC) or L-cysteine-sodium sulfide was added as a reducing agent to buffers and agar media used for enumeration of bacteria from rumen contents of high-forage-fed steers. Approximately equal colony counts were found on TC and L-cysteine-sodium sulfide-reduced media with rumen contents taken 8 h postfeeding, when active bacterial growth was oc
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11. Nucleotide analogs and new buffers improve a generalized method to enrich for low abundance mutations.
A high sensitivity method for detecting low level mutations is under development. A PCR reaction is performed in which a restriction site is introduced in wild-type DNA by alteration of specific bases. Digestion of wild-type DNA by the cognate restriction endonuclease (RE) enriches for products with mutations within the recognition site. After reamplificatio
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12. Regulation of the L-lactase dehydrogenase from Lactobacillus casei by fructose-1,6-diphosphate and metal ions.
The lactate dehydrogenase of Lactobacillus casei, like that of streptococci, requires fructose-1,6-diphosphate (FDP) for activity. The L. casei enzyme has a much more acidic pH optimum (pH 5.5) than the streptococcal lactate dehydrogenases. This is apparently due to a marked decrease in the affinity of the enzyme for the activator with increasing pH above 5.