Size Exclusion
Mostrando 1-12 de 427 artigos, teses e dissertações.
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1. Method for Cleaning Back-Produced Water from Polymer Flooding Operations to Determine Polymer Molar Mass Using Size-Exclusion Chromatography
One of the methods used by the oil industry to increase production is to inject water, containing polymer, into the reservoir. The viscosity of the aqueous solution is primarily responsible for the efficiency of this method, and is achieved using polymers with high molar mass. However, polymer degradation can occur during pumping and fluid displacement in th
J. Braz. Chem. Soc.. Publicado em: 2020-12
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2. Structural characterization and bioactivities of a polysaccharide from the stalk residue of Pleurotus eryngii
Abstract The structural characterization and bioactivities of a polysaccharide from the stalk residue of Pleurotus eryngii were investigated. Firstly the stalk residue of P. eryngii was collected from the top portion of spent mushroom substrate and processed to yield water-soluble polysaccharide. Subsequently this crude polysaccharide was purified by DEAE Se
Food Sci. Technol. Publicado em: 2020-06
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3. Evaluation of recombinant human interferon beta 1b by liquid chromatography methods and bioassay
Recombinant human interferon beta 1b (rhIFNβ-1b) is clinically used to treat multiple sclerosis. A reversed-phase liquid chromatography (RP-LC) method was carried out on a Jupiter C4 column (250 mm × 4.6 mm i.d.). The mobile phase A consisted of 0.1% trifluoroacetic acid (TFA) in water, and the mobile phase B was acetonitrile with 0.1% TFA run at a flow ra
Braz. J. Pharm. Sci.. Publicado em: 24/10/2019
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4. Nanostructured polymeric system based of cashew gum for oral admnistration of insulin
ABSTRACT The subcutaneous administration of insulin has been the treatment of millions of diabetics in the world. However, for such via insulin is invasive and not mimics the physiological action causing side effects. The oral route would be the most physiological and comfortable option, but the oral bioavailability of insulin is low by proteolytic activity
Matéria (Rio J.). Publicado em: 16/09/2019
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5. Prevalence of falls and associated factors in community-dwelling older Brazilians: a systematic review and meta-analysis
As quedas em idosos resultam em uma enorme carga epidemiológica, clínica e econômica nesta faixa etária no mundo inteiro, com alto risco de incapacitação grave. O estudo teve como objetivo estimar a prevalência de quedas e fatores associados entre idosos brasileiros, através de uma revisão sistemática com meta-análise. Foram realizadas buscas nas
Cad. Saúde Pública. Publicado em: 29/08/2019
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6. Synthesis and characterization of isoprene oligomers to compare different production chemical processes
Abstract Three methods to obtain isoprene oligomers were evaluated: chemical degradation of non-vulcanized coagulated natural rubber; chemical degradation of natural rubber latex; and oligomerization of the isoprene monomer. The products were characterized by infrared spectrometry (FTIR), nuclear magnetic resonance (NMR) and size-exclusion chromatography (S
Polímeros. Publicado em: 18/03/2019
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7. Iodoform Vs Calcium Hydroxide/Zinc Oxide based pastes: 12-month findings of a Randomized Controlled Trial
Abstract This study evaluated clinical and radiographic twelve-month outcomes of root canal treatments (CT) with smear layer removal, performed in primary teeth, using two different root canal filling materials. Pulpectomy was performed on 27 primary teeth with necrosis or irreversible pulpitis, caused by dental caries or trauma, in 23 children (2-7 years ol
Braz. oral res.. Publicado em: 11/02/2019
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8. Sample Preparation Applied to Analysis of Proteins in Cowpea Seeds (Vigna unguiculata (L.) Walp.)
In this study, 20 different protocols for protein extraction of cowpea seeds in natura were evaluated taking into account four parameters: cell disruption method, time, temperature and solvent. Factorial design experiments were executed to determine the effects on the total protein content of extracts. The total protein content was determined and the results
J. Braz. Chem. Soc.. Publicado em: 2019-01
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9. Structural insights into Plasmodium falciparum nicotinamide mononucleotide adenylyltransferase: oligomeric assembly
The biochemical pathways involved in nicotinamide adenine dinucleotide (NAD) biosynthesis converge at the enzymatic step catalysed by nicotinamide mononucleotide adenylyltransferase (NMNAT, EC: 2.7.7.1). The majority of NMNATs are assembled into homo-oligomeric states that comprise 2-6 subunits. Recently, the NMNAT of Plasmodium falciparum (PfNMNAT) has been
Mem. Inst. Oswaldo Cruz. Publicado em: 10/07/2018
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10. Preparation, Characterization and Photostability of Nanocomposite Films Based on Poly(acrylic acid) and Montmorillonite
Polyacrylic acid (PAA)/clay mineral (SWy-1) nanocomposites were prepared by intercalation in solution and their photostability was evaluated. For the nanocomposite films containing 5, 10 and 20 wt % in SWy-1 mass occurred intercalation along with some clay exfoliation, while for PAA/30%SWy-1, the intercalation of PAA chains into the clay interlayers was obse
Mat. Res.. Publicado em: 07/05/2018
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11. Isolation and biochemical characterization of bradykinin-potentiating peptides from Bitis gabonica rhinoceros
Abstract Background: Venoms represent a still underexplored reservoir of bioactive components that might mitigate or cure diseases in conditions in which conventional therapy is ineffective. The bradykinin-potentiating peptides (BPPs) comprise a class of angiotensin-I converting enzyme (ACE) inhibitors. The BPPs usually consist of oligopeptides with 5 to 13
J. Venom. Anim. Toxins incl. Trop. Dis. Publicado em: 08/02/2018
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12. Open partial nephrectomy for entirely intraparenchymal tumors: a matched case-control study of oncologic outcome and complication rate
ABSTRACT Purpose To compare the oncologic and clinical outcomes for open partial nephrectomy (OPN) performed in patients with entirely intraparenchymal tumors versus case-matched controls, with exophytic lesions. Material and methods Patients having undergone OPN between 2007 and 2012 were investigated. Exclusion criteria included patients with a benign
Int. braz j urol.. Publicado em: 2017-04