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Dissertations |
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1
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PABLO RUDÁ FERREIRA BARROS DE SOUZA
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USE OF TANIN EXTRACT AS A NATURAL COLOR FOR THE PLASTINATION PROCESS
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Advisor : EXPEDITO SILVA DO NASCIMENTO JUNIOR
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COMMITTEE MEMBERS :
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EXPEDITO SILVA DO NASCIMENTO JUNIOR
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MARIA ROSANA DE SOUZA FERREIRA
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EWERTON FYLIPE DE ARAÚJO SILVA
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Data: Jan 30, 2024
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Show Abstract
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A anatomia, conhecida há vários séculos, é uma disciplina de extrema importância na formação de profissionais na área da saúde. A utilização de cadáveres, que é essencial para seu ensino, faz repercutir discussões amplas sobre a maneira mais eficiente para utilização dessas peças. Atualmente, a maneira mais comum de ensino da anatomia é com conservação das peças cadavéricas conservadas em formaldeído, substância química, volátil com odor desagradável, e que causa irritabilidade nas vias respiratórias e na região dos olhos. Uma técnica inovadora desenvolvida pelo médico alemão Dr. Von Hagens em 1977, chamada de plastinação, favorece a minimização desses efeitos indesejados causados pelo formol. Essa técnica consiste na impregnação de polímeros de silicone, epóxi ou poliéster nos tecidos biológicos, retirando antes a gordura e a água ali presente, por meio da desidratação. Essa técnica possibilita uma maior durabilidade das peças cadavéricas e o torna com aspecto mais próximo ao natural. Por não apresentar substâncias conservadoras que causam malefícios à saúde, a plastinação facilita o manuseio e uso de peças cadavéricas para fins didáticos e científicos. Para que a visualização das estruturas se torne mais evidente, utiliza-se corantes específicos, bem como, a pintura das peças. Com isso se faz necessário o desenvolvimento de um protocolo de coloração dos tecidos musculares, associado à técnica de plastinação, tornando a técnica ainda mais eficiente. Com isso, o objetivo do presente trabalho é utilizar corante extraído da casca do pau-brasil (Paubrasilia echinata) na técnica de plastinação. Para isso, será utilizado métodos de alocação do corante em etapas diferentes do processo de plastinação, bem como sua associação com substâncias desidratantes distintas, os quais utilizará acetona ou álcool etílico. A fim de avaliar a melhor eficiência do corante para produção de protocolo adequado no processo de plastinação. O que tornará o ensino da anatomia humana mais eficiente
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2
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GABRIEL DUTRA TEIXEIRA
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"Distribution of the Manx shearwater (Puffinus puffinus) on the coast of the Potiguar Basin, Northeast Brazil: Space-Time Analysis and Correlation with Findings of Mortality Causes."
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Advisor : DANIEL SOLON DIAS DE FARIAS
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COMMITTEE MEMBERS :
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ANA BERNADETE LIMA FRAGOSO
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DANIEL SOLON DIAS DE FARIAS
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RADAN ELVIS MATIAS DE OLIVEIRA
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Data: Apr 5, 2024
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Show Abstract
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Puffinus puffinus is an animal species that belongs to a migratory seabird, and migrates to the South Atlantic crossing the Hemisfere when in the non-reproductive stage, to spend the summer. The coastal zone of the brazillian northeastern region is considered a relevant spot for the migratory routes of seabirds, in special, the region named Potiguar Basin (Rio Grande do Norte and Ceará). This area is monitored by an Beach Monitoring Project (in portuguese PMP-BP) that records, annually, a lot of specimens stranded alive or dead. The aim of this work is to determine the spatial-temporal pattern of stranded Puffinus puffinus in the States of RN and Ceará, and identify the most frequent causes of death and perform a histopathological diagnosis for this specimen. Were used data from the PMP-BP collected in daily monitoring since 2011 to 2022. The animals founded alive were forwarded to the Rehabilitation Center of Marine Fauna from Projeto Cetáceos da Costa Branca from Estadual University of Rio Grande do Norte in the city of Areia Branca (RN) and the dead animals were conducted to the Laboratory of Marine Biota for necropsy procedures. In these necropsies were collected tissue samples of organs that presented macroscopic alterations, in addition to gonads for sexing. These collected material underwent histological processing at the Vertebrate Morphology Laboratory at Federal University of Rio Grande do Norte. Sixty-six (66) individuals were recorded during the monitored period, 14 males, 17 females and 35 with undetermined sex. Of these, 43 individuals were classified as adults and 12 as juveniles. The spatio-temporal distribution analysis indicated that 33 animals stranded in the State of CE and 33 in the State of RN, from September to February. Regarding the analysis of cause of death, it was detected that marine debris, mechanical trauma and oil contamination are among the categories with an anthropogenic relationship and account for approximately 33% of the causes of death. The other causes were related to exhaustion, sepsis and parasitosis. The interpretation and organization of necropsy reports combined with histological tissue analysis offer more complete answers within the field of conservation strategies in favor of these animals.
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3
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WIGINIO GABRIEL DE LIRA BANDEIRA
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Stereological study of the effects of ayahuasca on the striatum neuroanatomy of juvenile marmosets (Callithrix jacchus) induced to chronic stress
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Advisor : EXPEDITO SILVA DO NASCIMENTO JUNIOR
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COMMITTEE MEMBERS :
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EXPEDITO SILVA DO NASCIMENTO JUNIOR
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MELQUISEDEC ABIARE DANTAS DE SANTANA
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PAULO LEONARDO ARAÚJO DE GÓIS MORAIS
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RUTHNALDO RODRIGUES MELO DE LIMA
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Data: Apr 26, 2024
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Show Abstract
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The striatum (St) integrates cognitive, motor and limbic functions and plays a critical role in the processing of emotions, motivation and rewards, and may undergo several morphophysiological changes in neuropsychiatric diseases. Depression, a complex psychiatric disorder, affects millions of people around the world and leads to an increased risk of suicide, decreased quality of life and functional impairment. Conventional treatments require prolonged use, leading to drug resistance, so new treatments and therapeutic strategies have been widely studied. Ayahuasca is a tea used in indigenous religious rituals, which has psychoactive properties. Its medicinal use in depression has shown promising results in preliminary studies. Our objective was to morphoquantitatively evaluate the effects of ayahuasca on St in an already validated model of juvenile depression induced in a non-human primate. Six marmosets were used, divided into groups of 2 animals. One group was kept in family life (GF) and two groups were socially isolated (GI). Social isolation was carried out for each animal, separating it from all others in the colony. One of the isolated groups received doses of ayahuasca tea (GT) 5 days before and three times during the isolation period, while the other groups received the same dose of saline as a placebo. After 120 days of experimentation, euthanasia and transcardiac perfusion were performed. The brains were sectioned and stained with thionin using the Nissl method. We carried out the St evaluation using stereological techniques to verify the total volume, neuronal volume density, estimate the total number of neurons and neuronal volume. For all measurements and estimates, equidistant sections of the caudate (Cd) and putamen (Pu) were analyzed, selected by systematic and uniform sampling. The GI and GT presented increased volumes when compared to the GF. The GI showed an increase in neuronal number compared to the GF. The treatment appears to have partially controlled this increase. Isolation increased neuronal distribution in St, and Ayahuasca reversed it. Our data show the decrease in volume of St neurons and the neuroregenerative/neuroprotective action of Ayahuasca in a model of juvenile depression in non-human primates subjected to social isolation, as evidenced by the partial restoration of normal neuronal volume and number.
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4
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LUIZ ROBERTO FERNANDES PEREIRA
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Stereological evaluation of the effects of ayahuasca (Banisteriopsis caapi and Psychotria viridis) on the somatosensory cortex of juvenile marmosets (Callithrix jacchus) induced to chronic stress
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Advisor : EXPEDITO SILVA DO NASCIMENTO JUNIOR
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COMMITTEE MEMBERS :
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EXPEDITO SILVA DO NASCIMENTO JUNIOR
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JUDNEY CLEY CAVALCANTE
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MELQUISEDEC ABIARE DANTAS DE SANTANA
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PAULO LEONARDO ARAÚJO DE GÓIS MORAIS
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Data: May 10, 2024
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Show Abstract
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Mood disorders such as depression are among the most common neuropsychiatric illnesses in humans, yet little is known about their neurobiology. The objective of this study was to assess the effects of Ayahuasca on the treatment of depression using morphoquantitative parameters in the primary somatosensory cortex of marmosets (Callithrix jacchus). The experimental animal used in the study was the marmoset, validated as a translational animal model of juvenile depression. Specimens were obtained through the Primate Center at UFRN. The entire process was overseen by a veterinarian, and the research was authorized by the Committee on Ethics in Animal Use (CEUA). For the results, six animals were randomly assigned to three groups: 2 in the family group (GF), 2 in the isolated group (GI), and 2 in the treated group (GT), aged 7 to 9 months at the start of the experiment, classified as juvenile I and II. The animals in the FG represented the positive control; those in the GI constituted the negative control group, and those in the GT formed the experimental group. The animals received Ayahuasca tea, provided by the Department of Physiology at UFRN, via gavage. Perfusion, craniotomy, and microtomy were performed. Subsequently, the obtained sections were stained using the Nissl technique, with thionin as the dye. Cavalieri's method was employed in stereology to analyze the volumes of areas in the primary somatosensory cortex (A3A, A3B, A1/2) among the animal groups (GF, GI, GT). The GT exhibited the largest volumes in all areas, with the A1/2 area showing the highest volumes in all groups. In contrast, the GF consistently displayed the smallest volumes.
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5
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MATHEUS MEDEIROS NUNES
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EVOLUTIONARY HISTOPATHOLOGICAL ANALYSIS OF CARCINOGENESIS INDUCED IN THE ORAL CAVITY, ESOPHAGUS AND STOMACH OF RATS
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Advisor : PEDRO PAULO DE ANDRADE SANTOS
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COMMITTEE MEMBERS :
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FABIANE FERREIRA MARTINS
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PEDRO PAULO DE ANDRADE SANTOS
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SERGIO ADRIANE BEZERRA DE MOURA
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Data: May 11, 2024
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Show Abstract
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The complexity of carcinogenesis requires detailed studies to assist in its understanding. The objective of the present study was to carry out the chemical induction of carcinogenesis, analyzing the histopathological evolution of epithelial changes that culminate in the appearance of Epidermoid Carcinoma in different regions of the digestive tract (oral cavity, esophagus and stomach) with different induction times. We used male Wistar rats as an experimental model of carcinogenesis induced by the compound 1-oxide 4 nitroquinoline (4-NQO), with histopathological analysis of the cases studied to establish the diagnosis, as well as histomorphometric analysis to obtain the area of the lesion. Correlating with the measurement of rat weights during the carcinogenesis induction process. Our sample consisted of two groups, one group at 8 weeks (G8) and a second group at 12 weeks (G12). At the end of the induction time, the groups were euthanized and the studied organs were removed, namely: Tongue and palate (oral cavity), esophagus and stomach, all of which were subjected to laboratory processing to create histopathological slides. In the histopathological analysis, we observed the presence of hyperkeratinization, and different degrees of dysplasia, the formation of squamous cell carcinoma in the tongue, palate, and esophagus was also described, while in the stomach, epithelial erosion was observed. Furthermore, we found that the neoplastic lesions appeared as well-differentiated carcinomas. The data on weight and lesion areas were normally distributed [Kolmogorov-Smirnov] and the ANOVA test was used for the lesion areas and showed a significant difference for the organ, therefore the Post-Hoc test was suggested. has a lesion area larger than the tongue, palate and stomach. The induction model proved to be effective for the formation of lesions for experimental carcinogenesis studies, highlighting the importance of these studies for understanding and substantiating oncological processes in humans.
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6
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CAINÃ OGUM GONÇALVES DA SILVA
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Evaluation of the antitumor activity of cashew gum and magnetic core-shell hybrid nanoparticles functionalized with oxaliplatin and retinoic acid in colorectal cancer
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Advisor : RAIMUNDO FERNANDES DE ARAUJO JUNIOR
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COMMITTEE MEMBERS :
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CLODOMIRO ALVES JUNIOR
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NAIANNE KELLY CLEBIS
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NAISANDRA BEZERRA DA SILVA FARIAS
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RAIMUNDO FERNANDES DE ARAUJO JUNIOR
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RENATA FIGUEIREDO ANOMAL
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Data: May 16, 2024
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Show Abstract
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Colorectal cancer (CRC) is one of the most prevalent and lethal types of cancer worldwide, urgently demanding the development of new therapeutic strategies. In this study, we explored the potential of core-shell nanoparticles (CSNP) and cashew gum nanoparticles (CGNP), combined with oxaliplatin and retinoic acid, as a novel approach in the treatment of CRC. Our objective was to synthesize and characterize CGNP+OXA+CSNP and CGNP+OXA+CSNP+RA hybrid nanosystems, evaluating their efficacy in in vitro and in vivo models of CRC, focusing on cell viability, apoptosis, nanosystem uptake, and drug resistance. To achieve our goals, we employed advanced synthesis methods to produce the hybrid nanosystems, followed by physicochemical characterization. We tested the therapeutic action of these nanosystems in CRC cell cultures and in a murine model using the CT-26 cell line, under the influence of an electromagnetic field, to observe viability, apoptosis, tumor uptake, morphological effects, and drug resistance. The results demonstrated that the CGNP+OXA+CSNP and CGNP+OXA+CSNP+RA hybrid nanosystems exhibited significant antitumor efficacy, reducing the viability of CRC cells in vitro and inhibiting tumor growth in vivo. We observed enhanced apoptosis induction and improved uptake of the nanosystems by tumor cells. Furthermore, functionalization with retinoic acid potentiated the antiproliferative effect, suggesting a promising approach to overcome oxaliplatin resistance. Exposure to the electromagnetic field appeared to amplify the efficacy of the nanosystems, indicating an innovative pathway. We conclude that the hybrid nanosystems developed in this study represent an innovative and effective therapeutic strategy against colorectal cancer. The combination of CGNP, CSNP, oxaliplatin, and retinoic acid, especially under the influence of an electromagnetic field, offers a promising platform for advancing CRC treatment, opening new perspectives for more targeted and personalized antitumor therapies.
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7
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CECÍLIA PAULINO CASSIANO DA SILVA
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HEPATIC AND PANCREATIC EVALUATION OF DIABETIC ANIMALS INDUCED BY STREPTOZOTOCIN TREATED WITH SPONDIAS TUBEROSA RUDE EXTRACT
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Advisor : KARINA CARLA DE PAULA MEDEIROS
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COMMITTEE MEMBERS :
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KARINA CARLA DE PAULA MEDEIROS
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RAIMUNDO FERNANDES DE ARAUJO JUNIOR
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Islania Giselia Albuquerque Gonçalves
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Data: Jun 7, 2024
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Show Abstract
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Diabetes mellitus (DM) is a chronic metabolic disorder characterized by persistent hyperglycemia, resulting from deficiency in insulin production by the pancreas and/or its action, leading to long-term complications. Pharmacological therapy for DM faces limitations due to the high number of side effects. Alternative treatments based on natural products have potential in the treatment of DM. The species Spondias tuberosa Arruda, known as umbuzeiro, has been widely used in traditional medicine to treat digestive diseases, infections and diabetes. Despite its frequent use, there are few studies on its benefits. However, a recent study demonstrated its antihyperglycemic activity. Considering the easy access to this species in the region and its pharmacological potential, the objective of this work is to evaluate the antidiabetogenic effect of Spondias tuberosa Arruda, in diabetic rats induced by streptozotocin, including clinical, biochemical, morphological analyses, and evaluation of possible markers involved in the therapeutic effect of the species under study. Fifty-two Wistar rats were used, and diabetes mellitus was induced by streptozotocin (40mg/kg i.p.). The groups were divided into 5: GC (control group animals), DM (animals with experimental diabetes), EX (non-diabetic animals treated with S. tuberosa extract), DMEX (animals with experimental diabetes treated with S. tuberosa extract ) and DMIN (animals with experimental diabetes treated with insulin). S. tuberosa extract (500 mg/kg, p.o.) and NPH insulin (10UI s.c.) were administered daily for 30 days after the onset of diabetes mellitus. The parameters analyzed showed that there was an increase in water intake, feed consumption and urinary volume, with weight loss in diabetic animals, a significant decrease in AST (aspartate aminotransferase) in the group treated with the extract, morphology and morphometry of the pancreas with considerable damage. representative samples showing atrophy and vacuoles in animals with DM and improvement in animals treated with insulin and extract. In the evaluation of liver morphology, there was an improvement in glycogen deposition in both extract and insulin treatments. In the evaluation of reactive oxygen species, it was observed that DM increased the immunofluorescence of this parameter, as well as the SOD enzyme by immunohistochemistry, however the extract was unable to reverse it. Given these results, it can be concluded that the extract reduced the histopathological and morphometric changes in liver and pancreatic tissue, even without managing to alleviate hyperglycemia. Investigating this plant will contribute to a better understanding of the complex pathophysiology of DM1 and will encourage research into new therapeutic or complementary alternatives based on medicinal plants from the rich Brazilian flora.
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8
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QUEZIA OLIVEIRA CHAVES
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MORPHOMETRIC ANALYSIS OF THE CORONARY ARTERIES AND MYOCARDIAL BRIDGES IN A POPULATION FROM RIO GRANDE DO NORTE: A CADAVERIC STUDY
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Advisor : JUDNEY CLEY CAVALCANTE
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COMMITTEE MEMBERS :
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JUDNEY CLEY CAVALCANTE
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EXPEDITO SILVA DO NASCIMENTO JUNIOR
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ANDRE LUIZ SILVA DAVIM
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Data: Jun 17, 2024
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Show Abstract
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Myocardial bridge (MB) is the name given to the partial tunneling of vessels that irrigate the heart, that is, myocardial fibers overlap these vessels for a variable length. In most cases, this condition is asymptomatic and has a good prognosis, but it can also be associated with various clinical pathological scenarios and even sudden death. Hence, these variations' characterizations are clinically and surgically relevant to support professional care practices. The main goal of this research was to count and measure the MB of human hearts in a population from Rio Grande do Norte. 86 out of 169 hearts analyzed presented PM (50.89%) with a total of 101 PM. Of the 101 PM, 91 were in the anterior interventricular artery (90.10%), 9 in the posterior interventricular artery (8.9%), and 1 in the right coronary artery (0.99%). 12 hearts (12.79%) had more than one MB. Along with the MB incidence and morphometric study, we also measured the coronary and interventricular arteries. The right coronary artery measured an average of 123.59±2.88 mm; the left coronary artery measured an average of 12.11±0.34 mm; The anterior interventricular artery measured an average of 108.65±1.88 mm; and the posterior interventricular artery measured an average of 55.27±1.35 mm. The prevalence of MB seen in the current study is above the world average, although the higher incidence in the anterior interventricular artery is under the literature. Similar studies carried out in populations from nearby states also point to a lower prevalence of MB. Although MB has a benign prognosis, its repercussions may be associated with myocardial ischemia, ventricular dysfunction, and sudden death. Therefore, we emphasize the importance of the current investigation and further research that helps to outline a better epidemiological profile of this abnormality.
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9
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EDUARDO LÚCIO PRIMO DOS SANTOS
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MEDIATION OF PRACTICAL CLASSES AT THE MUSEUM: STRATEGIES TO STRENGTHEN LEARNING IN HIGH SCHOOL.
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Advisor : CHRISTINA DA SILVA CAMILLO
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COMMITTEE MEMBERS :
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CHRISTINA DA SILVA CAMILLO
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SIMONE ALMEIDA GAVILAN
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RENATA SWANY SOARES DO NASCIMENTO
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Monique Danyelle Emiliano Batista Paiva
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Data: Jul 9, 2024
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Show Abstract
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Seeking appropriate methods to stimulate the cognitive and live experiences in teaching Science and Biology in non-formal teaching environments can perhaps corroborate the fixation of content and improvements in student learning. In this context, the present work was formulated with the aim of evaluating how the UFRN Museum of Morphological Sciences (MCM) can contribute to the learning of high school students about Human Morphology through a practical class. This museum space, here also recognized as a non-formal educational space, has a vast collection of formolized, taxidermied and also plastinated pieces, arranged in three exhibition rooms: Human Morphology, Marine Fauna and Animal Biodiversity, and has the presence of monitors capable of leading visitors on a fascinating journey of knowledge. Thus, 63 (sixty-three) students from 6 (six) classes of the 3rd year of high school at the Edgar Barbosa State School, located in the city of Natal/RN, participated in the research. Initially, students' prior knowledge was assessed through questionnaire 1, which also served as a guiding element for the preparation of the theoretical class. In the second moment, the biology teacher of the classes taught a theoretical lesson in the classroom on the Morphology of the Human Respiratory System, and after 24 hours the students answered questionnaire 2 containing 10 (ten) multiple choice questions, referring to the subject studied. . In the third moment, the students participated in a practical class in the MCM auditorium also on the Morphology of the Human Respiratory System, this time being taught by the museum's monitors. At MCM, students were separated into groups and then taken to a stand, organized with various anatomical pieces (synthetic, formaldehyde and/or plastinated), in which they received information passed on by the monitor about a region of the respiratory system, having access to vision and/or touch of available parts. After 24 hours of the practical class, students responded to questionnaire 3, identical to the previous one, aiming to quantify and compare the results between these two moments. There was a statistically significant difference between the answers to questionnaires 2 and 1, 3 and 1 and no difference between the answers obtained in questionnaires 3 and 2. Thus, we understand that the MCM can contribute to strengthening learning for high school students, showing- important for the school community, as a non-formal teaching space.
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10
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ANNE KAROLLINE RANGEL REBOUÇAS
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PREVALENCE OF THE CORONARY DOMINANCE PATTERN IN A POPULATION OF RIO GRANDE DO NORTE: A CADAVERIC AND IMAGINATIONAL STUDY
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Advisor : JUDNEY CLEY CAVALCANTE
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COMMITTEE MEMBERS :
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JUDNEY CLEY CAVALCANTE
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BENTO JOAO DA GRACA AZEVEDO ABREU
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EULAMPIO JOSE DA SILVA NETO
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Data: Aug 2, 2024
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Show Abstract
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Cardiac blood supply is carried out heterogeneously by the right and left coronary arteries. The anatomical distribution of these arteries and their branches determine what has been called coronary dominance, and is directly linked to the physiological arrangement. Schlessinger (1940) introduced the concept of coronary dominance and classified hearts as right, left, or balanced dominance depending on the position of the coronary arteries and their branches in relation to the crux cordis, on the diaphragmatic face of the heart [SCHLESINGER, M. J. Relation of the anatomical pattern to pathologic conditions of the coronary arteries. Arch. Pathol., 30: 403-415, 1940]. However, Falci Jr and co-workers (1994) proposed an alteration in this concept aiming to approximate the anatomical and physiological dominance [FALCI JUNIOR, R. et al. Anatomia das arterias coronarias. Rev. Med., 72(1):21-24, 1994]. The determination of the dominant pattern is correlated with heart diseases, with the left having the greatest range of associated diseases. The present study aimed to verify coronary dominance in human hearts from a population in Rio Grande do Norte. For this, 170 hearts from adult cadavers fixed in 10% formaldehyde from the Human Anatomy Laboratory of the Federal University of Rio Grande do Norte were dissected, had their coronaries exposed, and were classified as right, balanced, or left dominance, following the criteria of the aforementioned authors. In the second stage, the study will include the analysis and determination of the coronary pattern in vivo coronary angiography images. According to Schlessinger's (1940) criteria, our cadaver data show 73.5% of hearts with right dominance, 19.5% balanced dominance, and 7% left dominance. According to Falci Jr and co-workers's criteria (1994), our data show 50.6% of right dominance, 36.5% of balanced dominance, and 12.9% of left dominance. In both cases right dominance is predominant. Therefore, it is primarily understood that the regional population tends to have a lower risk of heart disease. However, the diversity of criteria adopted by each author can interfere with the research results, which reinforces the importance of a single criterion.
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11
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LUCAS ALEXANDRE ARAÚJO LINS
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ANALYSIS OF THE IMPACTS OF THE COVID-19 PANDEMIC ON MOTIVATION, PERCEPTION OF THE EDUCATIONAL ENVIRONMENT, COPING, AND MENTAL HEALTH OF HUMAN ANATOMY STUDENTS IN THE PHARMACY PROGRAM.
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Advisor : NAIANNE KELLY CLEBIS
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COMMITTEE MEMBERS :
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FIVIA DE ARAUJO LOPES
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FRANCISCO WILSON NOGUEIRA HOLANDA JÚNIOR
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NAIANNE KELLY CLEBIS
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ROVENA CLARA GALVAO JANUARIO ENGELBERTH
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Data: Aug 22, 2024
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Show Abstract
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In March 2020, with the official declaration of the COVID-19 pandemic by the WHO, both theoretical and practical classes, such as those in human anatomy, were transitioned to a remote format. This shift deprived students of personal interaction, immediate feedback from instructors, and the rich exchange of ideas fostered by in-person classes. To mitigate the impacts of the pandemic and the abrupt technological transition, it became essential to adopt various methodologies, including synchronous classes, video lectures, forums, and continuous student monitoring by course assistants, with activities designed to stimulate students and facilitate their understanding of human anatomy. In this context, this research aimed to evaluate the learning process of students enrolled in the MOR-0048 Human Anatomy course for the Pharmacy program at DMOR/UFRN during the academic periods of 2021.1, 2021.2, and 2022.1, across both morning and evening sessions, amid the COVID-19 pandemic, considering the various factors involved in this process. Data were collected through questionnaires administered to students enrolled in the course, totaling 227 students distributed among the remote (20.56%), hybrid (41.12%), and in-person (38.32%) teaching formats. When examining motivation levels, it was observed that the hybrid format produced superior results compared to in-person classes, while the remote format was statistically similar to the hybrid format in various aspects. However, the in-person format was associated with a decline in motivational levels compared to the other two formats, a trend significantly influenced by the adverse conditions of returning to in-person classes. This finding underscores the perception of the educational environment as a critical factor in students' relationship with the course and the teaching process as a whole. This correlation was further supported when evaluating behaviors adopted to prevent contagion, indicating that these social and personal practices remained prevalent among the groups, highlighting the enduring impact of the COVID-19 pandemic on students' daily lives. Additionally, the data pointed to distinct levels of coping strategy usage, particularly among the in-person cohorts, once again indicating that the return to in-person teaching posed a potential risk for students and that the teaching-learning process could be influenced by these factors, especially due to their repercussions on students' mental health, affecting levels of stress, anxiety, and depression. In conclusion, the teaching-learning process is significantly influenced by both the perception of the educational environment and the level of motivation, which are critical factors in students' relationship with the course and its overall impact on their academic journey. The coping strategies adopted by students were closely related to the transition from hybrid to in-person teaching, acting as a stress intensifier, suggesting the need for targeted psychological support for students to mitigate the negative impacts on mental health and ensure the healthy maintenance of the teaching-learning process. This consideration should account not only for content delivery methods but also for the broader context in which the student is immersed.
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12
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LORENA NOBRE CORTEZ
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Oxidative stress and the development of the auditory cortex in rats model of autism: effect of Lidibia Ferrea on the formation of perineuronal net
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Advisor : RENATA FIGUEIREDO ANOMAL
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COMMITTEE MEMBERS :
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FABIANA SANTANA KRAGELUND
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JUDNEY CLEY CAVALCANTE
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RENATA FIGUEIREDO ANOMAL
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Data: Oct 28, 2024
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Show Abstract
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The critical period is a postnatal time in which cortical development is highly susceptible to plasticity induced by environmental sensory stimuli. The events that occur during the opening and closing of the critical period then have important impacts on the formation of cortical sensory processing maps, and also on sensory perception in adult life. It has been described in the literature that the opening of the critical period of postnatal development is characterized by the beginning of maturation of parvalbumin-positive (PV+) interneurons in the sensory cortex. This maturation begins when components of the extracellular matrix begin to surround PV+ interneurons, forming perineuronal networks that stabilize the synapses of these neurons, reduce plasticity dependent on sensory experience and protect PV+ cells from oxidative stress. Currently, it is suggested that the pathophysiology of autism spectrum disorder (ASD) involves changes in PV+ cells and perineuronal networks due to increased oxidative stress, which would result from modifications in the local conditions necessary to initiate and close the critical period of sensory cortical areas. ASD, in turn, is a neurodevelopmental disorder clinically characterized by communication deficits, lack of social interaction and repetitive behaviors with restricted interest. This research monograph suggests that auditory perception deficits originating in the primary auditory cortex (A1) in individuals with ASD may be related to failures in the opening or closing of the critical period for the spectral development of A1, as a consequence of oxidative stress of the cells PV+ and impairment in the development of the perineuronal net. Therefore, it will describe the effects of intraperitoneal administration of Libidia Ferrea extract, during the critical period of A1 spectral development, on the development of perineuronal.
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13
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PAULO RICARDO FRANÇA DA SILVA
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RELATIONSHIP BETWEEN FIXATION TIME AND THE PRESENCE OF RETRACTION ARTIFACTS SIMULATING LYMPHOVASCULAR INVASION IN MALIGNANT NEOPLASMS
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Advisor : CHRISTINA DA SILVA CAMILLO
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COMMITTEE MEMBERS :
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CHRISTINA DA SILVA CAMILLO
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PEDRO PAULO DE ANDRADE SANTOS
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SERGIO ADRIANE BEZERRA DE MOURA
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FABIANE FERREIRA MARTINS
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Data: Nov 29, 2024
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Show Abstract
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Cancer is one of the leading causes of death worldwide and represents a major challenge for global public health. As important as understanding the molecular and biological mechanisms underlying the development and progression of tumors is assertive diagnosis for effective disease management, directly impacting therapeutic choices, prognosis and patients' quality of life. Lymphovascular invasion (LVI) is an important prognostic marker in the staging of malignant tumors, playing a critical role in assessing the aggressiveness and metastatic potential of cancer. The presence of tumor cells within lymphatic or blood vessels is considered a high-risk indicator for metastatic dissemination, directly influencing therapeutic decisions, such as the need for more intensive adjuvant treatments, including chemotherapy, radiotherapy and targeted therapies. Histological analysis of tumors using the paraffin technique with H&E staining is still the most widely used in pathology departments. Fixation is a critical step in the proper preparation of these samples to ensure the preservation of tissue morphology and consequent diagnostic accuracy, a condition that also depends on the technical ability and experience of the pathologist who will be evaluating them. This study investigates the impact of 6-, 48- and 72-hour formaldehyde chemical fixation times on breast, colonic and uterine tumor tissues, with the aim of identifying whether there is any interference in pathologists' interpretation in differentiating lymphovascular invasion from retraction artifacts during the histopathological evaluation of tumors. After evaluation by 3 pathologists, the results indicate that fixation for 6 hours showed a lower percentage of doubts in differentiating between retraction artifacts and lymphovascular invasions, which may indicate a fixation time with better potential for structural tissue preservation. Fixation at 48 and 72 hours showed an increase of more than 50% in confusion when evaluating these artifacts with lymphovascular invasions.
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