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Effect of low concentrations of synthetic surfactants on polycyclic aromatic hy...

The present study is focused on the effect of synthetic surfactants, at low concentration, on the kinetics of polycyclic aromatic hydrocarbons (PAH) biodegradation by Pseudomonas putida ATCC 17514 and addresses the specific issue of the effect of the surfactant on bacterial adhesion to PAH, which is believed to be an important mechanism for the uptake of hydrophobic compounds. For that purpose, three surfactant...

Bioactivity of the recombinant human antimicrobial peptide LL37 : a key role in...

Recycling of cellulases in lignocellulosic hydrolysates using alkaline elution

The recovery of cellulases from lignin, lignocellulosic hydrolysates and cellulose by alkaline washes at pH 9 and 10 was examined. The effect of the pH on the structural stability of purified Cel7A was analyzed by circular dichroism. Purified Cel7A showed conformational changes at pH 9 and 10 that were reversible at pH 4.8. Temperature influenced the enzymatic hydrolysis of wheat straw and may be critical for t...

Effect of surfactants on the kinetics of anthracene biodegradation by pseudomon...

Combined antibiotic-phage therapies to control Pseudomonas aeruginosa biofilms

Pseudomonas aeruginosa is responsible for 65% of mortality in hospitals all over the world. Its prevalence is attributed to factors such as: intrinsic resistance determined by virulence factors; acquired resistance mechanisms that lead to a low susceptibility to antimicrobial agents; and ability to attach to any natural and artificial surfaces and form biofilms. The emergence of new strategies to control P. aer...

Wound healing activity of the human antimicrobial peptide LL37

Antimicrobial peptides (AMPs) are part of the innate immune system and are generally defined as cationic, amphipathic peptides, with less than 50 amino acids, including multiple arginine and lysine residues. The human cathelicidin antimicrobial peptide LL37 can be found at different concentrations in many different cells, tissues and body fluids and has a broad spectrum of antimicrobial and immunomodulatory act...

Participation of neuronal nitric oxide synthase in experimental neuropathic pai...

Nerve injury leads to a neuropathic pain state that results from central sensitization. This phenomenom is mediated by NMDA receptors and may involve the production of nitric oxide (NO). In this study, we investigated the expression of the neuronal isoform of NO synthase (nNOS) in the spinal cord of 3-month-old male, Wistar rats after sciatic nerve transection (SNT). Our attention was focused on the dorsal part...

Uso de viscoelásticos na facoemulsificação em cães portadores de catarata: efei...

Avaliaram-se as células endoteliais, a espessura corneana e a pressão intraocular (PIO) de cães portadores de catarata madura, empregando-se viscoelástico à base de hialuronato de sódio 3% e sulfato de condroitina 4% e hidroxipropilmetilcelulose 2%, utilizando-se 20 cães, distribuídos entre os dois grupos dos viscoelásticos. A técnica cirúrgica adotada foi a da facoemulsificação bimanual. As avaliações tonométr...

Avaliação qualitativa e quantitativa na deposição de calda de pulverização em C...

O objetivo deste estudo foi o de avaliar a quantidade e qualidade da deposição da calda de pulverização em plantas de Commelina benghalensis, considerando os volumes de aplicação, as pontas de pulverização e o ângulo dos bicos na barra de pulverização. Foram utilizadas cinco hastes de plantas por vaso. O delineamento experimental adotado foi o inteiramente casualizado, com 20 repetições. O experimento foi condu...

Seletividade de herbicidas em variedades de cana-de-açúcar

Este trabalho teve como objetivo avaliar a seletividade do herbicida topramezone aplicado de forma isolada e em mistura com tebuthiuron, em pós-emergência inicial, sobre dez variedades de cana-de-açúcar em condição de cana-planta. Os tratamentos utilizados foram: topramezone + Dash® (70 g ha-1 + 0,25% v/v); topramezone + tebuthiuron + Dash® (70 + 1.000 g ha-1 + 0,25% v/v); topramezone + tebuthiuron + Dash® (100...