Universidade Brasil

One-step production and physicochemical characterization of biodiesel using rubber seed oil blends

Abstract The seeds of Hevea brasiliensis (HB) stand out as a promising feedstock for biodiesel production owing to their high oil content. However, its elevated acid value poses a challenge, requiring pre-treatment steps before transesterification. Given this scenario, the presen...

(±)-Nigronetides A−D and Nigronetides E−H, Complex Polyketides Produced by the Marine-Derived Fungus Nigrograna sp. M13

Abstract (±)-Nigronetides A−D (1−4) and nigronetides E−H (5−8), polyketides with complex carbon skeletons, were isolated from cultures of the marine-derived fungus Nigrograna sp. M13, presenting three novel carbon skeletons. While the planar structures and relative configuration...

He who pays the piper calls the tune? Capital structure and ESG performance in emerging markets

Purpose This study analyzes the association between capital structure and the environmental, social, and governance (ESG) performance among companies in emerging markets. Design/methodology/approach Using data from the London Stock Exchange Group covering 24 emerging markets and...

Microbial oil production by Yarrowia lipolytica strains using glycerol as carbon source

Abstract Yeasts can produce microbial oil from hydrophobic substrates such as glycerol, a byproduct of the biodiesel industry that is often undervalued in the market. Yarrowia lipolytica is capable of degrading glycerol and is considered a model organism for studying lipid accumu...

Single and MultipleInfestation by Coccoid Pests inCoffee Shape Plant Chemical Defenses and Interactions Across TrophicLevels

Abstract Crop plants are attacked by multiple pests, inducing metabolic changes that shape interactions across trophic levels and influence the effectiveness of biological control. We examined how infestation by the coccoids Coccus viridis (scales) and Planococcus citri (mealybug...

Contribution of One‐Electron Oxidation of Purine and Pyrimidine Bases to the Photo‐ and Radiation‐Induced Damage to Cellular DNA

One‐electron oxidants that include type I photosensitizers, biologically relevant carbonate anion radical generators, and high intensity UVC nanosecond lasers are able to ionize in aqueous solution purine and pyrimidine nucleobases. The survey is aimed at critically reviewing the...

Reliability of Reagent Strips in Veterinary Medicine: A Critical Evaluation of pH and Urinary Density in Dogs using Statistical Modeling

BACKGROUND: Urinalysis is a simple and essential test in veterinary practice, involving physical, chemical, and microscopic analysis of urine. Reagent strips are widely used due to their practicality; however, their reliability compared with reference laboratory methods remains a...