Navegando por Data de Publicação, começando com "2024-03-13"

Filtrar resultados por ano ou mês

Agora exibindo 1 - 2 de 2

A historicidade biológica da cor da pele dos seres humanos
(Universidade Federal de São Carlos, 2024-03-13) Campos, Vitória Emanoely Castro; Silva, Mariana Martha de Cerqueira Silva; https://lattes.cnpq.br/6083262350667325; https://orcid.org/0000-0003-3445-7271; https://lattes.cnpq.br/9714683481442492
Skin color is one of the most notable physical characteristics in individuals, and is often used to create stereotypes of inferiority, reinforcing prejudices and racism. According to the Demographic Census carried out by IBGE, in 2022, considering the race-color aspect, 45.30% of Brazilians declare themselves mixed race and 10.20% declare themselves black. The black population (the sum of browns and blacks) therefore represents 55.50% of Brazilians. Understanding the history and biology of different skin tones, as well as the ancient civilizations that preceded us, is of fundamental importance for breaking paradigms created based on certain phenotypes. Observing the absence of discussion of ethnic-racial relations in Biological Sciences disciplines, the present work aims to discuss the contributions of human evolution studies to the understanding of the biological historicity that explains the skin color of human beings. As a result, an informative booklet was produced on this topic, to scientifically disseminate the content to, mainly, young audiences. In order to collaborate with an anti-racist education perspective, the objective is that such knowledge becomes curricular content in Basic Education schools and Higher Education courses.
Nanofibras de poli(álcool vinílico) e zeína incorporadas com micronutriente para revestimento de sementes
(Universidade Federal de São Carlos, 2024-03-13) Natarelli, Caio Vinicius Lima; Oliveira, Juliano Elvis de; https://lattes.cnpq.br/4990968421738051; https://orcid.org/0000-0001-9570-8308; Marconcini, José Manoel; https://lattes.cnpq.br/5373845785326215; https://orcid.org/0000-0002-0419-9796; https://lattes.cnpq.br/3047763076067521; https://orcid.org/0000-0002-1651-3236
The development of seed coatings with a controlled release of micronutrients is extremely important for sustainable and precision agriculture. However, the selection of suitable materials for this purpose represents a challenge, given the complexity in processing immiscible or partially miscible polymers. Techniques for producing nanofibers, such as solution blow spinning, emerge as alternatives for the production of these materials. In this context, the present study aimed to produce nanofibers from poly(vinyl alcohol) (PVA) and zein, two immiscible polymers, and characterize them. In addition to producing nanofibers with incorporated zinc, a micronutrient, so that they act as a coating capable of releasing micronutrients during plant germination and growth. Nanofiber mats were obtained from polymeric solutions with different proportions of PVA and zein, obtaining materials with properties dependent on their formulation. The surface properties of the mats were significantly changed by increasing the zein content (> 37.5%), changing the surface hydrophilicity to hydrophobicity. This increase also reduced the erosion capacity of the nanofibers, while fungal susceptibility was increased. However, the high porosity of the mats (> 80%) provided high permeability to water vapor. With encapsulation efficiency greater than 90%, nanofiber mats incorporated with zinc were produced with a two-step release profile, a rapid initial release followed by a slow release, associated with the zinc reservoir in the nanofibers. Due to their biodegradability, nanofibers were applied as a seed coating, which were subsequently subjected to germination testing. With this, it was confirmed that the released zinc was absorbed by the seedlings, acting as a fertilizer to aid plant growth. Therefore, it can be concluded that PVA and zein nanofibers are a promising material and can be used in several applications, including the proposed one.