15 research outputs found
Prevalence of diarrheagenic Escherichia coli in children with diarrhea in Salvador, Bahia, Brazil
HIV-1 seroprevalence in the general population of Salvador, Bahia State, Northeast Brazil
Bioelectronic Energy Storage: A Pseudocapacitive Hydrogel Composed of Endogenous Biomolecules
Advances
in bioelectronics have produced implantable devices for
in vivo biosensing and therapeutics, but batteries for implantable
devices currently require bulky metal cases to sequester toxic electrolytes
and immunogenic active materials; therefore, development of new materials
is paramount for safety and miniaturization. Implantable batteries
could be fully biocompatible if they exclusively comprised endogenous
materials. Accordingly, we present an energy-storage material fabricated
entirely from endogenous biomolecules via one-step carbodiimide conjugation
of dopamine (DA) to hyaluronic acid (HA). The DAHA composite can be
electropolymerized to create a pseudocapacitive biopolymer, p(DAHA),
that exhibits catechol–quinone interconversion, stability,
long-term electroactivity for 400 cycles, and high pseudocapacitance
(up to ∼900 F g<sup>–1</sup>) and discharge capacity
(∼130 mAh g<sup>–1</sup> at ∼10 A g<sup>–1</sup>). These characteristics predispose it for bioelectronic
energy storage, i.e., as a supercapacitor or, when coupled with an
implantable Ag/AgCl electrode, a biobattery with an operating voltage
of ∼0.85 V
Nerve Growth Factor-Immobilized Electrically Conducting Fibrous Scaffolds for Potential Use in Neural Engineering Applications
And the Injun goes “How!”: Representations of American Indian English in white public space
Community-based monitoring of diarrhea in urban Brazilian children: incidence and associated pathogens.
Community-based monitoring was conducted in order to investigate the occurrence of diarrhea in 'sentinel areas' of Salvador, Brazil, and to establish a preliminary profile of the most common pathogens present in children's diarrhea by screening stool samples. This report describes the results obtained from twice weekly home visits to identify and follow diarrhea episodes and testing of carer-requested stool sample collection over a 6-month period. Participants were selected from a large longitudinal study in 21 areas representing the city's poorer socioeconomic and sanitary conditions. Fecal samples were examined for the presence of pathogenic bacteria, viruses and protozoa. The mean incidence of diarrhea was 4.97 episodes per child-year, and longitudinal prevalence was 13.6 days per child-year (3.7%). Pathogens were found in 44% of the fecal samples examined. Bacteria were the most frequently encountered pathogens (isolated in 22% of samples), followed by protozoa (19.5%) and viruses (16%). Viral and bacterial pathogens were associated with episodes of severe diarrhea, while viral and protozoan pathogens were associated with longer episodes. The study demonstrated the importance of a public health monitoring system based on 'sentinel areas'