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O Repositório Institucional da UFSCar (RI UFSCar) é um sistema de informação que visa armazenar, preservar, organizar e disseminar amplamente a produção intelectual dos diversos setores e segmentos da comunidade da UFSCar, provendo o acesso aberto à informação produzida na instituição e registrada como científica, tecnológica, didática, artístico-cultural e técnico-administrativa.

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Ecologia espacial como ferramenta para compreender os potenciais impactos de cães domésticos em uma unidade de conservação do Cerrado
(Universidade Federal de São Carlos, 2026-04-15) Gonçalves, Beatriz Garcia; Lima, Caio Filipe da Motta; http://lattes.cnpq.br/5833399072087947; http://lattes.cnpq.br/5148317135041568; Beisiegel, Beatriz de Mello; Dénes, Francisco Voeroes; http://lattes.cnpq.br/8143797535693714; https://lattes.cnpq.br/5139370160420533
The domestic dog (Canis lupus familiaris) is an invasive species of global significance, posing a potential threat to native wildlife and biodiversity. Introduced to virtually every region of the planet, dogs—when poorly managed—can cause serious disturbances to wildlife and ecological imbalances, especially stray dogs or those raised to roam freely. These impacts include predation, transmission of infectious diseases, harassment, competition for resources and territory, hybridization with native canids, and predation on livestock. In this context, understanding the spatial behavior of these animals is essential for assessing their potential ecological impacts. This study investigated the spatial patterns of semi-domesticated dogs in the vicinity of the Serra de Caldas Novas State Park (PESCaN—GO), as well as their potential to invade the conservation area.The dogs were classified into two groups based on their origin: rural and peri-urban. A total of 36 individuals (15 females and 21 males) were monitored using GPS collars programmed to record coordinates every 10 minutes for 21 to 28 days (June through December 2024). Analyses were performed using R software, including estimates of home range and foray range (areas of movement beyond the dogs’ homes) via Kernel Density Estimation (KDE), using 95% and 50% isopleths. The average foray range was 165.20 hectares (ha). On average, the dogs spent 57.25% of their time at their homes, 37.36% on forays, and 5.12% visiting neighboring homes. During these forays, the dogs traveled an average of 83.52 m from their homes, reaching a maximum distance of 10.85 km. Dogs in rural areas had an average foray range of 262.55 ha (1.62–2,602.22 ha), values 8.27 times greater than those observed for dogs in peri-urban areas, whose average foray range was 11.47 ha (0.58–41.09 ha). Rural dogs undertook more extensive forays, with routes 44% longer than those of peri-urban dogs, although they spent a smaller proportion of their time on these forays. Large dogs also exhibited larger foray ranges and longer movements than small and medium-sized dogs. It was observed that 25% of the monitored dogs entered the interior of the park, representing a potential threat to the Cerrado’s wildlife. Considering the total area of PESCaN (approximately 12,000 ha), estimates based on kernel density indicated that 45.22% of the park’s area (5,500 ha) is frequently used by dogs, while 13.14% (1,613 ha) is intensively used. The results highlight striking differences between the spatial behaviors of dogs in rural and peri-urban areas, indicating the need for distinct management strategies for each group. While peri-urban areas have a higher density of dogs, dogs in rural areas explore significantly larger areas, potentially exerting greater pressure on wildlife. Thus, this study provides relevant information on the spatial use patterns of semi-domesticated dogs in the region, contributing to the development of management strategies aimed at mitigating impacts on biodiversity and promoting conservation in Cerrado protected areas.
Funcionalidade e impacto de fatores contextuais em lactentes com e sem risco biológico nos dois primeiros anos de vida: evidência com metodologia remota
(Universidade Federal de São Carlos, 2026-09-02) Abreu, Raissa Wanderley Ferraz de; Rocha, Nelci Adriana Cicuto Ferreira; http://lattes.cnpq.br/2035754554780009; https://lattes.cnpq.br/0595803592033851; Santos, Denise Castilho Cabrera; Mendonça, Ayrles Silva Gonçalves Barbosa; Campos, Ana Carolina de; Pfeifer, Luzia Iara; http://lattes.cnpq.br/5359936580844926; http://lattes.cnpq.br/6072012811555265; http://lattes.cnpq.br/5292093208120940; http://lattes.cnpq.br/9065968448027440
Telehealth, or digital health practice, gained relevance during the COVID-19 pandemic, expanding the use of remote strategies for the care of vulnerable populations. In this context, this thesis verified the functioning and contextual factors associated with the activities and participation at home of infants and children born with biological risk in the first two years of life, through remote assessment and monitoring. Thus, five studies were conducted that produced evidence with remote methodologies developed during and after the COVID-19 pandemic. Study I aimed to compare gross motor skills and the presence of opportunities in the home environment, as well as to verify the impact of these opportunities at home on the motor skills of infants with biological risk before and after 6 months of age. It was found that the group over 6 months had more toys compared to the younger group, and a greater variety of stimulation and having more gross motor toys were associated with better gross motor skills outcomes. Study II identified facilitators and barriers to home participation for infants with and without biological risk during the first year of life. Environmental factors, such as greater caregiver willingness to change, younger mothers with higher levels of education, and a facilitating home environment, contributed to greater participation in the group of infants with biological risk. In relation to the group without risk, factors such as younger mothers with higher levels of education and less willingness to change, a facilitating home environment, and higher family income promoted greater home participation. Based on these results, and with the aim of expanding knowledge about participation and its intervening factors in the home setting beyond the first year of life, Study III was conceived and developed. Its objective was to describe the e-Followkids protocol for the remote monitoring of functioning and contextual predictive factors in children at 12, 18, and 24 months who were born with biological risk. Study IV evaluated the feasibility of this protocol (e-FollowKids) in Brazil and its association with sociodemographic factors (family income, education, maternal age, and number of siblings). A recruitment rate of 56.86%, adherence of 79.31%, and sample loss of 20.68% were achieved. Mothers reported high satisfaction, good understanding, and acceptability of the protocol, with a low percentage of identified barriers (19.5%) to follow-up. There was no association between feasibility according to mothers' perception and sociodemographic factors. Finally, Study V compared the home participation of infants and children with and without biological risk at 12, 18, and 24 months, verifying the trajectory of participation and associations with environmental 12 factors and functional abilities in the group with biological risk. Children with risk showed higher frequency at 12 months, while those without risk showed greater involvement at 18 months; at 24 months there was no difference between the groups. In the at-risk group, engagement increased at 24 months, and in the non-at-risk group, frequency and engagement were higher at 18 and 24 months compared to 12 months. Greater mobility and environmental support were associated with greater engagement at 12 months. At 24 months, higher scores in functional skills such as daily living and social/cognitive activities, as well as environmental support, were associated with greater participation, while lower scores for the general home environment and less mobility were associated with a greater desire for change on the part of the caregiver. Home environmental factors at 12 months did not predict participation at 24 months. The results obtained in this thesis can begin to support evidence-based practice, through remote methodologies, in the area of child development. Furthermore, it fosters the relationship between health components and contextual factors, based on the principles of dynamic and multidirectional interactions in infants and children in the first 2 years of life. Thus, it favors the promotion of actions and/or programs in public policies in child health, for monitoring functioning in this crucial developmental phase, considering the caregiver as a modulating agent of the environment and remote methodologies as a means of intervention.
Obtenção de nanofibrilas de celulose a partir de macroalgas para imobilização enzimática
(Universidade Federal de São Carlos, 2025-11-17) Gama, Rafaela Santos; Farinas, Cristiane Sanchez; http://lattes.cnpq.br/9933650905615452; http://lattes.cnpq.br/4046398304262669; Mendes, Adriano Aguiar; Azeredo, Henriette Monteiro Cordeiro de; Tardioli, Paulo Waldir; Wolf , Mariana Govoni Brondi; http://lattes.cnpq.br/2926571414651131; http://lattes.cnpq.br/8516223928904348; http://lattes.cnpq.br/0808991927126468; http://lattes.cnpq.br/2753123048179923
The aim of this study was to produce cellulose nanofibrils from macroalgae for use in enzyme immobilization. The effect of the pre-treatment step on the cellulose isolation was investigated, as well as the relationship between macroalgae mechanical defibrillation and nanofibril size. Furthermore, the relationship between bleaching treatment and crystallinity index of the nanofibrils was investigated, as well as the effect on thermal stability and stability in colloidal suspension. The results showed that the bleaching step promoted the removal of lignocellulosic matrix components, increasing the crystallinity index from 29.5% to 78.3%. In addition, mechanical defibrillation led to the formation of thin nanofibrils (D = 4 nm). Thermal stability of cellulose decreased after bleaching (from 259.2°C to 239.7°C), but the stability of the colloidal suspension increased, as shown by the measurement of the zeta potential, which reduced from -22.4 to -59 mV. The nanofibrils produced were subsequently used in the immobilization phytase, where the effect of pH and ionic strength were evaluated. The biocatalysts produced by immobilization in sodium phosphate buffer at a concentration of 20 mM and pH 6 obtained higher values of immobilization yield (98.9%) and recovered activity (94.8%). The methodology developed herein was efficient in producing cellulose nanofibrils with potential application as particles for enzymatic immobilization.
Cyberbullying contra professores: a autoridade escolar como alvo de violência virtual
(Universidade Federal de São Carlos, 2020-02-13) Reis, Renan Aparecido da Silva; Zuin, Antônio Álvaro Soares; http://lattes.cnpq.br/5543562307373287; https://orcid.org/0000-0002-6850-2897; http://lattes.cnpq.br/4763163158241586; Zuin, Antônio Álvaro Soares; D'Affonseca, Sabrina Mazo; Oliveira, Paula Ramos de; http://lattes.cnpq.br/5543562307373287; http://lattes.cnpq.br/0381029115416584; http://lattes.cnpq.br/1788063551247254; https://orcid.org/0000-0002-6850-2897; https://orcid.org/0000-0001-9103-0616
The contemporary context demonstrates that children and adolescents have increasingly used the virtual environment and the Internet as privileged spaces for communication, self-expression, and the establishment of social bonds. While bullying has traditionally been confined to the physical environment in which it occurs, its manifestations are no longer restricted to the spatial boundaries of schools or other face-to-face settings. In the digital context, such practices acquire new dynamics and significantly expand their reach, becoming what is known as cyberbullying. This phenomenon is characterized by intentional, repetitive, aggressive, and hostile actions or behaviors carried out by individuals or groups through electronic devices connected to the Internet, with the deliberate aim of causing harm, humiliation, or suffering to the victim. An important aspect of this issue concerns the expansion of the targets of virtual violence. Whereas such attacks were initially directed primarily at other students, they currently affect other members of the school community, especially teachers, who represent figures of pedagogical, disciplinary, and institutional authority. Considering the complexity of this scenario and the transformations in school relationships mediated by digital technologies, this study sought to identify the factors underlying the various forms of violence directed at teachers, as well as to analyze, from the perspective of Critical Theory, the contemporary role of humiliation and the public degradation of teachers’ image. To achieve these objectives, the study was organized into two parts. The first presents a theoretical and conceptual discussion of cyberbullying against teachers. The second consists of an analysis of videos portraying situations related to the research problem.
Análise sazonal do limiar de dispersão da espécie Melipona quadrifasciata (Apidae: Meliponini) em um ambiente antropizado
(Universidade Federal de São Carlos, 2025-02-18) Santos, Luccas de Almeida; Toppa, Rogério Hartung; http://lattes.cnpq.br/0673898572494729; https://orcid.org/0000-0002-1637-2840; http://lattes.cnpq.br/5299845462319881; https://orcid.org/0000-0002-7048-6582
Animals move freely through the environment in search for resources. The stability of ecosystems determines the relationships between species and their biodiversity. However, anthropogenic interference in the environment increasingly threatens ecological relationships and the survival of species. Bees play a crucial role in maintaining ecosystems, but their influence is limited by the flight capacity of each species. Various biotic and abiotic factors influence this capacity. In the case of bees from the genus Melipona, the flight distance is approximately 2000 meters. Using the mark-release-recapture technique, this study aimed to evaluate the flight distance and return capacity of individuals from the stingless bee species Melipona quadrifasciata in an anthropized environment. Colonies were placed in semi-field conditions within an anthropized landscape for analysis over time. The released bees were monitored using a Radio-Frequency Identification (RFID) system, which allowed for individual tracking and recording of return times. Return capacity was assessed based on the number of bees that returned during both rainy and dry seasons, as well as across a gradient of distances. The intertegular span was used to determine the size of the bees, and land-use classes were employed to identify factors influencing return capacity. Returns were observed at distances of up to 7500 meters. The distance gradient and bee size influenced both the capacity and time taken to return to the colony. The results indicated that bee size and land-use classes are factors influencing both the capacity and time of return for this species. Although no strong evidence was found regarding the influence of climatic seasonality, a reduction in the number of returns was observed during the rainy season.