Intrathymic Cell Migration: Implications in Thymocyte Development and T Lymphocyte Repertoire Formation.

During the development of T cells in the thymus, differentiating thymocytes move through specific thymic compartments and interact with the cortical and medullary microenvironments of the thymic lobules. This migration is primarily controlled by adhesion molecules, such as extracellular matrix ligands and receptors, and soluble factors like chemokines that are important for thymocyte differentiation. The migration events driven by these molecules include the entry of lymphoid progenitors from the bone marrow, movement within the thymus, and the exit of mature thymocytes.

History of the Thymus: From a Vestigial Organ to the Programming of Immunological Self-Tolerance.

This introductive chapter presents the most important disruptions of concepts concerning the thymus since its discovery in Antique Greece. For centuries, the thymus was considered as a vestigial organ, and its role in T-cell differentiation was proposed only in the 1960s. Most recent studies attribute to the thymus an essential and unique role in programming central immunological self-tolerance.

Frailty trajectories and mortality risk in community-dwelling older adults: a 9-year follow-up study.

Purpose: Frailty is a well-established risk factor for adverse health outcomes, yet its dynamic nature and predictors remain partially understood. This study aimed to investigate factors influencing frailty transitions and mortality risk among community-dwelling older adults.

Methods: We conducted a longitudinal study using a 9-year follow-up data from the Health, Well-being, and Aging Study (SABE, as known in Portuguese).

Use of confocal laser scanning microscopy to evaluate the metal ion removal and destabilization of Enterococcus faecalis biofilms by EDTA and etidronic acid.

Chelating substances bind to metals, forming stable complexes, rendering these essential ions unavailable for microbial metabolism and community stability in biofilms. This action can contribute to the disinfection in endodontic treatments. Through confocal laser scanning microscopy (CLSM), this study quantified the metal ion removal by chelating agents in Enterococcus faecalis biofilms and assessed the impact on community stability.

Impacts of the COVID-19 Pandemic on the HIV Care Continuum and Associated Factors in High-Income Nations: A Mixed-Methods Systematic Review.

The COVID-19 pandemic has significantly impacted the HIV care continuum (HCC), presenting challenges while also driving positive transformations globally. This study examines the impact of the COVID-19 pandemic on HCC in high-income countries, aiming to identify barriers and facilitators to care delivery amidst global health challenges. This study employs JBI mixed-methods systematic review methodology.

Examining the test-retest reliability of commonly used neuromuscular, morphological, and functional measures in aging adults.

The present study aimed at determining the test-retest reliability of commonly used measures in a sample of middle-aged and older participants who presented with a wide range of functional abilities. Participants were middle-aged (40-55 years) and older adults (> 60 years) with- and without mobility limitations, tested both before and after a 4-week period (n = 43). Measures included maximal dynamic (1-RM) and isometric strength, surface EMG (sEMG), peak power, ultrasound-derived muscle size and quality, as well as the performance on the 30-s sit-to-stand, habitual and maximal gait speed, timed up-and-go, stair climb, and 6-min walk tests.

Comparison of the effects of laser photobiomodulation at wavelength of 660 nm and 808 nm in full-thickness burns in rats: a pre-clinical study.

Third-degree burns are severe thermal injuries that require prolonged recovery periods and are associated with significant sequelae. Photobiomodulation therapy (PBMT) has emerged as a promising approach for treating skin injuries, although parameter selection remains controversial. This study investigated the effects of PBMT using red (wavelength 660 nm) and infrared (wavelength 808 nm) lasers on tissue repair in third-degree burns in rats.

The action of injectable nanodispersion of Bixa orellana (Chronic-in®) on arthritis in diabetic rats: pharmacological and histopathological studies.

Unlabelled: Diabetic arthritis (DA) is a microvascular complication associated with diabetes mellitus (DM), necessitating the exploration of innovative therapeutic approaches. The Amazon biome, rich in bioactive compounds, offers potential treatments; notably, Bixa orellana, which contains tocotrienol and geranylgeraniol, exhibits anti-inflammatory and antioxidant properties, particularly when formulated as a nanodispersion.

Objective: This study aims to investigate the pharmacological effects of an injectable nanodispersion of Bixa orellana, termed Chronic-in®, in diabetic Wistar rats.

The impact of interrupted ATXN10 expansions on clinical findings of spinocerebellar ataxia type 10.

Background: Spinocerebellar ataxia type 10 (SCA10), due to an ATTCT repeat expansion in ATXN10, has variable expressivity and the role of presence (ATTCTint +) and absence (ATTCTint-) of interruptions in the repeat is not clear. We aimed to describe the relations between ATTCTint + and age at onset, seizures, and neurologic severity in ataxic and non-ataxic carriers from Brazil.

Methods: Family, age at onset (AO), and seizures data plus DNA were obtained from symptomatic carriers already diagnosed in Porto Alegre, Curitiba, and São Paulo, Brazil.

Gauging the impact of heatwaves on the thermal perception of pedestrians with thermal walks in a humid subtropical climate.

Studies point to an increase in the frequency of heatwaves, revealing that they are longer lasting and more intense, with noticeable impacts from climate change observed in the south of Brazil. This study evaluates the impact of a heatwave event in Curitiba, Brazil, and investigates whether the excessive heat caused during this period influenced the thermal perception reported by participants in a fieldwork carried out during dynamic microclimatic surveys on a university campus. To this end, volunteers took part in thermal walks accompanied by a researcher carrying a portable equipment for monitoring environmental variables, covering points of interest previously defined in a walking circuit with different morphological and land cover configurations.

Social Media and Plastic Surgery, the Good, the Bad, and Where are We Going?

Background: In recent decades, social networks have experienced an exponential increase involving millions of users and transforming the way they communicate in the medical community, becoming an important tool in medicine, where plastic surgery has not been an exception.

Objectives: We aimed to present a review of the effects of social networks in the area of plastic surgery, the main existing regulatory frameworks, and propose the basic aspects for the adequate use of these platforms in the practice of our profession.

Methods: A literature search was performed, including scientific articles, specific existing guides from the USA, Australia, Brazil, and Argentina, as well as articles in digital newspapers and Google regarding emblematic cases.

Technological mapping of plant-based patents for treating bovine mastitis.

Bovine mastitis costs the world's economy an estimated USD 19.7-32 billion annually. Plant-based products have been used as alternative treatments with advantages such as minimal side effects, and no studies have reported the formation of resistant microorganisms.

The importance of using local species in ecotoxicological studies: nematodes of Amazonian occurrence vs. Caenorhabditis elegans in the analysis of lethal and sublethal effects of aluminium.

It is recognized that in bioassays, especially those conducted for ecotoxicological purposes, preference should be given to the use of species that are adapted to the physical-chemical conditions of the environment to be monitored. However, to establish the use of alternative species instead of the standardized ones, it is recommended to carry out tests to assess/compare their sensitivity to contaminants. This study assessed the lethal and sublethal effects (growth, fertility, and reproduction) of different aluminium concentrations, including environmentally relevant concentrations recorded in the Amazon, on two nematode species (C.

Dietary Intake and Gut Microbiome in Chronic Kidney Disease.

Gut dysbiosis, characterized by an imbalance in the gut microbiota, has emerged as a potential factor influencing chronic kidney disease (CKD) progression. This condition plays a crucial role in the gut-kidney axis, where changes in microbial composition can contribute to systemic inflammation and uremic toxin production and ultimately exacerbate kidney damage. Understanding the dynamics of the gut-kidney axis provides new insights into potential therapeutic strategies to mitigate CKD progression.

Unique features of seizure-induced cardiorespiratory failure in SS rats: Implications for sudden unexpected death in epilepsy.

Objective: Patients with uncontrolled epilepsy are at high risk for sudden unexpected death in epilepsy (SUDEP), which likely results from a pathological, seizure-induced disruption of vital physiological systems. The objective of this study was to characterize seizure-induced physiological dysfunction leading to death in SS rats and determine the importance of time of day of seizures regarding mortality rates.

Methods: Male and female SS rats were surgically implanted with an arterial pressure telemeter and chronically housed in a custom plethysmograph.

Reduced growth and biofilm formation at high temperatures contribute to Cryptococcus deneoformans dermatotropism.

Cryptococcus deneoformans (Cd) and C. neoformans (Cn) differ in geographic prevalence and dermatotropism, with Cd strains more commonly isolated from temperate regions and skin infections. Rising global temperatures prompt concerns regarding selection for environmental fungal species with increased thermotolerance, as high mammalian temperatures provide protection against many fungal species.

ELECTROCHEMOTHERAPY WITH CISPLATIN FOR THE TREATMENT OF A NON-OPERABLE ORAL SQUAMOUS CELL CARCINOMA IN A LOWLAND TAPIR ().

Squamous cell carcinoma (SCC) is a malignant epidermal tumor. Biologic behavior and metastasis rate vary according to species and tumor location. The goal of this study was to report the occurrence and behavior of an oral SCC in a treated with electrochemotherapy.

RISK FACTORS FOR MORTALITY IN BIRDS OF PREY UNDERGOING REHABILITATION IN SOUTHERN BRAZIL.

As top predators, birds of prey play a vital role in maintaining ecological balance, making their conservation essential. This retrospective study examined risk factors influencing the release or mortality of raptors treated at three rehabilitation centers in southern Brazil. Of 1,035 raptors admitted, Strigiformes were the most common, particularly (tropical screech owl).

UPPER DIGESTIVE ENDOSCOPY IN CAPTIVE COATIS (, LINNAEUS, 1766).

This study aimed to perform upper digestive endoscopy in clinically healthy coatis (), based on descriptions in domestic dogs and cats. In addition, research was carried out for r in stomach samples. Five adult male coatis, weighing between 2.

ANTIBODIES TO SPP. IN THREE SPECIES OF FREERANGING OPOSSUM ( SPP.) IN FLORIDA, USA, AND BRAZIL.

The opossum has been recognized as an intermediate host for many parasites including spp., which is a protozoan that infects various mammals, including many wildlife species. A limited number of reports using serology, histopathology, and molecular assays have documented the presence of in opossums.

ASSESSMENT OF ECHOCARDIOGRAPHIC PARAMETERS IN HEALTHY FREE-RANGING GIANT ANTEATERS ().

The aim of this study was to conduct Doppler echocardiography on healthy free-ranging anteaters () and to evaluate the relationship between echocardiographic parameters of diagnostic importance and animal body weight (BW). This work utilized 8 anesthetized adult animals and 4 manually restrained pups. The echocardiographic examinations were performed with the animal in left lateral recumbency.

ILAE neuroimaging task force highlight: The utility of multimodal neuroimaging in diagnostic and presurgical workup of drug-resistant focal epilepsy.

The ILAE Neuroimaging Task Force publishes educational case reports that highlight basic aspects of neuroimaging in epilepsy, consistent with ILAE's educational mission. In patients with drug-resistant focal epilepsy who are candidates for surgical intervention, the identification of structural abnormalities is a strong predictor of favorable postoperative seizure outcomes. When conventional imaging is insufficient, the integration of multimodal neuroimaging data with structural, metabolic, and functional imaging modalities is often helpful.

The burden of migraine in Mexico: a database analysis of migraine-related visits to emergency departments in Mexico's ministry of health (MMoH) hospitals.

Background: The burden of migraine in Mexican Emergency Department (ED) settings remains understudied. This study aimed to determine the frequency of migraine-related ED visits within the ED Mexican Ministry of Health's (MMoH) database and analyze their demographics and treatment patterns.

Research Design And Methods: This retrospective study analyzed MMoH database of ED visits between 2013 and 2022.