Guarana (Paullinia cupana) as a potential tool for mesenchymal stromal cells priming in regenerative medicine.

Mesenchymal stromal cells (MSCs) have therapeutic potential due to their abilities of differentiation, immunomodulation, and migration to injured tissues, potentiating such effects when cells are activated. Guarana (Paullinia cupana) is a tropical plant species found in South America that is known for its antioxidant, stimulant, and cicatricial effects. The guarana extract is composed of many substances and caffeine is the main component. The objective was to evaluate the effects of guarana and caffeine on MSCs. After the initial characterization, MSCs were treated with Paullinia cupana (10, 100, and 1000 µg/mL) or caffeine (0.4, 4, and 40 µg/mL) for 24 h. MSCs treatment with 1000 µg/mL guarana increased cell polarity, viability, cell migration to chemoattractant, antioxidant potential, and liberation of extracellular vesicles (EVs), while it reduced the levels of autophagy. MSCs treated with 100 and 1000 µg/mL guarana or 40 µg/mL caffeine showed a decrease of cell proliferation. No treatment affected the cellular area and cell cycle of MSCs. The study shows in vitro evidence that guarana could be a promising alternative for activating MSCs to promote better cellular products for future clinical therapies.

Wearable near-infrared spectroscopy: reliability and sensitivity among different endurance cycling exercise intensities.

The present study investigated the reliability and sensitivity of a wearable near-infrared spectroscopy (wNIRS) device in moderate and heavy exercise intensity domains. On three separate days, eleven males performed an incremental test to exhaustion, and in the following visits, four submaximal constant-load bouts (i.e., test and retest) were performed in the moderate-intensity domain (100 and 130 W) and heavy-intensity domain (160 and 190 W). The local tissue oxygen saturation index (SmO2) and pulmonary oxygen uptake (V̇O2) were measured continuously. The absolute SmO2 and V̇O2 values and the change (Δ) from the 3rd to 6th min of exercise were calculated. There was good reliability for SmO2 measurements, as indicated by the high intraclass correlation coefficient analysis (ICC ≥0.84 for all) and low coefficient of variation between the two trials (CV ≤4.1% for all). Steady-state responses were observed for SmO2 and V̇O2 from the 3rd to the 6th min in the two moderate-intensity bouts (P>0.05), whereas SmO2 decreased and V̇O2 increased from the 3rd to the 6th min in the two heavy-intensity bouts (P<0.05). Together, these findings suggested that the SmO2 measured with a wNIRS device is reliable and sensitive to track local metabolic changes provoked by slight increments in exercise intensity.

Wearable near-infrared spectroscopy: reliability and sensitivity among different endurance cycling exercise intensities

The present study investigated the reliability and sensitivity of a wearable near-infrared spectroscopy (wNIRS) device in moderate and heavy exercise intensity domains. On three separate days, eleven males performed an incremental test to exhaustion, and in the following visits, four submaximal constant-load bouts (i.e., test and retest) were performed in the moderate-intensity domain (100 and 130 W) and heavy-intensity domain (160 and 190 W). The local tissue oxygen saturation index (SmO2) and pulmonary oxygen uptake (V̇O2) were measured continuously. The absolute SmO2 and V̇O2 values and the change (Δ) from the 3rd to 6th min of exercise were calculated. There was good reliability for SmO2 measurements, as indicated by the high intraclass correlation coefficient analysis (ICC ≥0.84 for all) and low coefficient of variation between the two trials (CV ≤4.1% for all). Steady-state responses were observed for SmO2 and V̇O2 from the 3rd to the 6th min in the two moderate-intensity bouts (P>0.05), whereas SmO2 decreased and V̇O2 increased from the 3rd to the 6th min in the two heavy-intensity bouts (P<0.05). Together, these findings suggested that the SmO2 measured with a wNIRS device is reliable and sensitive to track local metabolic changes provoked by slight increments in exercise intensity.

Guarana (Paullinia cupana) as a potential tool for mesenchymal stromal cells priming in regenerative medicine

Mesenchymal stromal cells (MSCs) have therapeutic potential due to their abilities of differentiation, immunomodulation, and migration to injured tissues, potentiating such effects when cells are activated. Guarana (Paullinia cupana) is a tropical plant species found in South America that is known for its antioxidant, stimulant, and cicatricial effects. The guarana extract is composed of many substances and caffeine is the main component. The objective was to evaluate the effects of guarana and caffeine on MSCs. After the initial characterization, MSCs were treated with Paullinia cupana (10, 100, and 1000 μg/mL) or caffeine (0.4, 4, and 40 μg/mL) for 24 h. MSCs treatment with 1000 μg/mL guarana increased cell polarity, viability, cell migration to chemoattractant, antioxidant potential, and liberation of extracellular vesicles (EVs), while it reduced the levels of autophagy. MSCs treated with 100 and 1000 μg/mL guarana or 40 μg/mL caffeine showed a decrease of cell proliferation. No treatment affected the cellular area and cell cycle of MSCs. The study shows in vitro evidence that guarana could be a promising alternative for activating MSCs to promote better cellular products for future clinical therapies.

Ethnic differences in normal electrocardiographic findings in elite brazilian football players: b-pro foot ECG pilot study

INTRODUCTION: The 12-lead electrocardiogram (ECG-12) is a useful tool in the assessment of athletes. The prevalence of normal electrocardiographic findings in elite Brazilian football players (EBFP) of different ethnicities is not well described. PURPOSE: To compare the prevalence of normal ECG-12 findings in Caucasian, Mixed-race (MR), and Afro-Brazilian (AB) EBFP. METHODS: A multicenter cross-sectional descriptive study was conducted with exams performed on EBFP as a pre-participation assessment from February 18, 2002, through October 20, 2022. RESULTS: 4,363 EBFP from 51 professional clubs (from all five regions of Brazil; 15 states, and 21 cities), aged 15-35 years (median: 19 years; IQR: 16-23) were evaluated. 2,027 were Caucasians, 1,324 were MRs, and 1,012 were ABs. In general, we recorded 4,155 ECG-12 with normal variations (95.2%). Positive Sokolow-Lyon criteria for left ventricular hypertrophy was more prevalent in ABs (41.8%) than in Caucasians (33.4%), or MRs (32.7%). The prevalence of early repolarization in ABs (41.5%) was higher than in Caucasians (34.6%), or MRs (35.5%). The PR interval was longer in ABs (157.1 ms) than in Caucasians (151.4 ms), or MRs (153.3 ms), and the first-degree atrioventricular block was more frequent in ABs compared to MRs (4.2% vs. 2.3%, respectively). On the other hand, Caucasians had a higher prevalence of incomplete right bundle branch block (14.2%) than MRs (11.2%), or ABs (9.7%). In our sample, only three EBFP showed second-degree atrioventricular block Mobitz type I (0.07%; one Caucasian and two AB athletes). CONCLUSIONS: This is the first large study to compare the prevalence of ECG-12 findings in EBFP from different ethnic groups. Those of AB origin have a significantly higher prevalence of ECG-12 findings compatible with the athlete's heart than Caucasians and MRs.

Frequency of leisure-time physical activity and pulse pressure in the Brazilian population: a population-based study.

OBJECTIVE: The purpose of this study was to investigate the association between the frequency of leisure-time physical activity and brachial pulse pressure (PP), according to physical activity intensity and type, sex, and age, in the general Brazilian population. STUDY DESIGN: This was a cross-sectional study based on data from the Brazilian 2013 National Health Survey. METHODS: The sample consisted of 20,058 men and 20,600 women aged between 18 and 65 years. The frequency of leisure-time physical activity was obtained through a questionnaire and classified according to intensity (vigorous or moderate) and type (cyclic or acyclic). We calculated PP as the difference between systolic and diastolic blood pressures based on the measure of a digital pressure device. Multiple linear regression analysis was applied to analyze the association of different sexes, frequency, type, and intensity of leisure-time physical activity and PP. RESULTS: Adjusted results showed that one session of moderate physical activity per week could benefit men's PP: ß = -1.87 mmHg; SE = 0.83. For women, the adjusted model reveals that physical activity undertaken twice a week is sufficient to benefit PP: ß = -1.77 mmHg; SE = 0.72. However, according to type, two times a week of acyclic activities increased PP in men: ß = 2.62 mmHg; SE = 0.62 and decreased in women: ß = -2.67 mmHg; SE = 0.72. CONCLUSIONS: Our results suggest that low frequencies of leisure-time physical activity are sufficient to induce beneficial effects on the cardiovascular system for both sexes. Also, there are some differences between sexes in cardiac adaptations according to type, frequency, and intensity of physical activity.

Non-malignant silica-related diseases in a specialized outpatient clinic.

BACKGROUND: Uncontrolled occupational exposure to silica is still frequent in Brazil, with several recent records in the state of Minas Gerais. However, few national studies have addressed silica-related diseases other than silicosis. AIMS: To describe the occurrence of the main non-malignant silica-related diseases: silicosis, tuberculosis (TB), chronic obstructive pulmonary disease (COPD), and autoimmune diseases in a specialized outpatient clinic. METHODS: Case series study of 1525 patients exposed to silica, seen between 1984 and 2021, with descriptive findings of clinical and occupational data from the first medical evaluation. RESULTS: Medians of age and exposure time were 47 and 15 years, respectively, and 97% of patients were male. The prevalence of silicosis was 44%, of which 27% had large opacities. The main occupational sectors were underground gold mining (28%), precious and semi-precious stone work (20%), and artisanal mining (9%). Spirometries were abnormal in 55%, with obstructive disorder being the most common finding. COPD (25%), active TB or sequelae (12%), and connective tissue diseases (6%) were diagnosed in patients with and without silicosis. CONCLUSIONS: The percentage of silicosis appears to be alarming, even considering the biases of selective referrals. The patients were relatively young and already had a functional impact, caused not only by silicosis but by one or more silica-related diseases. COPD, TB, and connective tissue diseases proved to be frequent, leading to the need for specifics protocols to investigate them in individuals exposed to silica. By adopting strategies to combat silicosis, the prevention of other silica-related diseases is concomitantly promoted.

Cryo-radiofrequency Stimulates Browning of Adipocytes in Mice.

BACKGROUND: Local fat accumulation is a health risk and this has raised interest in the development of aesthetic treatments, such as cryo-radiofrequency (CRF). OBJECTIVE: To evaluate the consequences of CRF in adipose tissue remodeling in a model system. MATERIALS AND METHODS: Lean and high-fat diet-induced obese mice were assessed 7 days after one CRF application; and lean mice were assessed 0, 3, 6 and 12 h after one application of CRF. Assessments included histology, DNA degradation, gene expression, ELISA of cytokines, serum analysis and neutrophil presence. RESULTS: Unchanged fat mass was found 7 days after CRF in obese and lean mice. However, lean mice showed smaller adipocyte size with areas resembling a browning process. TNF levels, apoptotic cells, and UCP-1 expression increased 7 days after CRF in inguinal adipose tissue of lean mice. Although no differences were found in fat mass, adipocyte size decreased just after CRF and this changed was maintained until 12 h, with cells resembling beige adipocytes. CONCLUSION: We suggest that CRF therapy is capable of inducing thermogenic adipocytes in lean mice.

Ising spin glass in a random network with a Gaussian random field.

We investigate thermodynamic phase transitions of the joint presence of spin glass (SG) and random field (RF) using a random graph model that allows us to deal with the quenched disorder. Therefore, the connectivity becomes a controllable parameter in our theory, allowing us to answer what the differences are between this description and the mean-field theory i.e., the fully connected theory. We have considered the random network random field Ising model where the spin exchange interaction as well as the RF are random variables following a Gaussian distribution. The results were found within the replica symmetric (RS) approximation, whose stability is obtained using the two-replica method. This also puts our work in the context of a broader discussion, which is the RS stability as a function of the connectivity. In particular, our results show that for small connectivity there is a region at zero temperature where the RS solution remains stable above a given value of the magnetic field no matter the strength of RF. Consequently, our results show important differences with the crossover between the RF and SG regimes predicted by the fully connected theory.

Molecular identification of Ehrlichia sp. in a beef cattle from Brazilian Cerrado - case report / Identificação molecular de Ehrlichia sp em um bovino do Cerrado brasileiro - relato de caso

Ehrlichia infections in cattle are frequent in Africa but have also been reported in Brazil and North America. This paper reports natural infection by Ehrlichia sp. associated with Babesia bigemina and Anaplasma marginale in a calf in the municipality of Campo Grande, state of Mato Grosso do Sul, Brazil, presenting polioencephalomalacia. The molecular evidence, based on a fragment of the dsb gene, indicates a species of Ehrlichia genetically related to Ehrlichia canis and other species of the genus found in the tick Rhipicephalus (Boophilus) microplus and a calf from Brazil (99 to 100% identity). It was not possible to associate the clinical signs with Ehrlichia infection due to co-infections and histological evidence of another disease. However, the circulation of the bacteria in bovines in Brazilian Cerrado was confirmed and more attention should be given to clinical suspicion of tick-borne pathogens in cattle to clarify the pathogenic potential of Ehrlichia sp.(AU)

Infecções por Ehrlichia em bovinos são frequentes na África, mas também foram relatadas no Brasil e na América do Norte. Este artigo relata uma infecção natural por Ehrlichia sp. associado a Babesia bigemina e Anaplasma marginale em um bezerro, no município de Campo Grande, Mato Grosso do Sul, Brasil, o qual apresentava polioencefalomalácia. A evidência molecular, baseada em um fragmento do gene dsb, indica uma espécie de Ehrlichia geneticamente relacionada a Ehrlichia canis e outras espécies do gênero encontradas no carrapato Rhipicephalus (Boophilus) microplus e em um bezerro do Brasil (99 a 100% de identidade). Não foi possível associar os sinais clínicos à infecção por Ehrlichia devido a coinfecções e evidências histológicas de outra doença. No entanto, a circulação da bactéria em bovinos no Cerrado brasileiro foi confirmada, e mais atenção deve ser dada à suspeita clínica de patógenos transmitidos por carrapatos em bovinos para esclarecer o potencial patogênico de Ehrlichia sp.(AU)

Molecular identification of Ehrlichia sp. in a beef cattle from Brazilian Cerrado - case report / Identificação molecular de Ehrlichia sp em um bovino do Cerrado brasileiro - relato de caso

Ehrlichia infections in cattle are frequent in Africa but have also been reported in Brazil and North America. This paper reports natural infection by Ehrlichia sp. associated with Babesia bigemina and Anaplasma marginale in a calf in the municipality of Campo Grande, state of Mato Grosso do Sul, Brazil, presenting polioencephalomalacia. The molecular evidence, based on a fragment of the dsb gene, indicates a species of Ehrlichia genetically related to Ehrlichia canis and other species of the genus found in the tick Rhipicephalus (Boophilus) microplus and a calf from Brazil (99 to 100% identity). It was not possible to associate the clinical signs with Ehrlichia infection due to co-infections and histological evidence of another disease. However, the circulation of the bacteria in bovines in Brazilian Cerrado was confirmed and more attention should be given to clinical suspicion of tick-borne pathogens in cattle to clarify the pathogenic potential of Ehrlichia sp.(AU)

Infecções por Ehrlichia em bovinos são frequentes na África, mas também foram relatadas no Brasil e na América do Norte. Este artigo relata uma infecção natural por Ehrlichia sp. associado a Babesia bigemina e Anaplasma marginale em um bezerro, no município de Campo Grande, Mato Grosso do Sul, Brasil, o qual apresentava polioencefalomalácia. A evidência molecular, baseada em um fragmento do gene dsb, indica uma espécie de Ehrlichia geneticamente relacionada a Ehrlichia canis e outras espécies do gênero encontradas no carrapato Rhipicephalus (Boophilus) microplus e em um bezerro do Brasil (99 a 100% de identidade). Não foi possível associar os sinais clínicos à infecção por Ehrlichia devido a coinfecções e evidências histológicas de outra doença. No entanto, a circulação da bactéria em bovinos no Cerrado brasileiro foi confirmada, e mais atenção deve ser dada à suspeita clínica de patógenos transmitidos por carrapatos em bovinos para esclarecer o potencial patogênico de Ehrlichia sp.(AU)

Conocimiento, prácticas de prevención y bioseguridad sobre Brucelosis en trabajadores de hatos lecheros de Caaguazú-Paraguay / Knowledge, prevention and biosecurity practices about Brucellosis of workers exposed to risk of dairy data of Caaguazú-Paraguay

Introducción: La Brucelosis es una zoonosis común y en muchos países es un problema sanitario prevalente. En Paraguay no se ha encontrado evidencia de los conocimientos que tienen los trabajadores de hatos lecheros y las prácticas preventivas que utilizan. Objetivo: Evaluar el conocimiento, las prácticas de prevención y de bioseguridad sobre Brucelosis de los trabajadores expuestos a riesgo en hatos lecheros del departamento de Caaguazú, Paraguay. Materiales y métodos: Se realizó un estudio transversal, en una muestra representativa de establecimientos ganaderos del Departamento de Caaguazú. De mayo a junio de 2017 se entrevistó a 720 trabajadores de 360 hatos lecheros, utilizando un cuestionario estructurado, con preguntas cerradas. Se obtuvo información de los conocimientos, prácticas de prevención y bioseguridad sobre Brucelosis. Resultados: La mediana de edad de los trabajadores fue 34 años, 70% eran hombres. El 11,7% era analfabeto y 62,1% solo culminó la primaria. El 90% se desempeñaba como tambero/ordeñador. El 64% manifestó que no conocía la enfermedad, 73,6% ignoraba la forma en que se adquiere la enfermedad, 71,5% nunca recibió información acerca de la Brucelosis. El 73,3% no tenía conocimientos de las prácticas preventivas. Todos consumían subproductos lácteos sin pasteurizar, principalmente queso paraguay Conclusión: Existe desconocimiento de la enfermedad y la forma de transmisión. Las prácticas de riesgo son frecuentes. Es necesario implementar programas de educación y concienciación sobre la Brucelosis. Palabras clave: Brucelosis; conocimientos; prácticas de prevención; medidas de bioseguridad; humanos.

Background: Brucellosis is a common zoonosis and in many countries it is a prevalent health problem. In Paraguay, no evidence has been found of the knowledge that dairy herd workers have and the preventive practices they use. Objective: To evaluate the knowledge, prevention and biosecurity practices on Brucellosis of workers exposed to risk in dairy herds of Caaguazú. Materials and methods: A cross-sectional study was carried out in a representative sample of livestock establishments in the Department of Caaguazú. From May to June 2017, 720 workers from 360 dairy farms were interviewed, using a structured questionnaire with closed questions. Information on the knowledge, prevention and biosecurity practices on brucellosis was obtained. Result: The median age of the workers was 34 years, 70% were men. 11.7% were illiterate and 62.1% only completed the primary. 90% worked as a tambero/milker. Sixty-four percent said they did not know about the disease, 73.6% did not know how the disease was acquired, 71.5% never received information about brucellosis. 73.3% had no knowledge of preventive practices. All consumed unpasteurized dairy byproducts, mainly Paraguayan cheese. Conclusion: There is a lack of knowledge of the disease and the way of transmission. Risk practices are frequent. It is necessary to implement education and awareness programs on brucellosis. Keywords: Brucellosis; knowledge; prevention practices; biosecurity;survey; human.

A new animal diet based on human Western diet is a robust diet-induced obesity model: comparison to high-fat and cafeteria diets in term of metabolic and gut microbiota disruption.

BACKGROUND/OBJECTIVES: Obesity is a metabolic disorder that predisposes patients to numerous diseases and has become a major global public-health concern. Animal models of diet-induced obesity (DIO) are frequently used to study obesity, but which DIO model most accurately reflects the pathology of human obesity remains unclear. In this study, we designed a diet based on the human Western diet (WD) and compared it with the cafeteria diet (CAF) and high-fat diet (HFD) in order to evaluate which diet most closely mirrors human obesity. METHODS: Wistar rats were fed four different diets (WD, CAF, HFD and a low-fat diet) for 18 weeks. Metabolic parameters and gut microbiota changes were then characterized. RESULTS: Rats fed the four different diets exhibited completely different phenotypes, highlighting the importance of diet selection. This study also revealed that WD most effectively induced obesity and obesity-related disorders, and thus proved to be a robust model of human obesity. Moreover, WD-fed rats developed obesity and obesity-related comorbidities independent of major alterations in gut microbiota composition (dysbiosis), whereas CAF-fed rats developed the greatest dysbiosis independent of obesity. We also characterized gut microbiota after feeding on these four different diets and identified five genera that might be involved in the pathogenesis of obesity. CONCLUSIONS: These data suggest that diet, and not the obese state, was the major driving force behind gut microbiota changes. Moreover, the marked dysbiosis observed in CAF-fed rats might have resulted from the presence of several additives present in the CAF diet, or even a lack of essential vitamins and minerals. Based on our findings, we recommend the use of the prototypic WD (designed here) in DIO models. Conversely, CAF could be used to investigate the effects of excessive consumption of industrially produced and highly processed foods, which are characteristic of Western society.

Effect of ultrasonic activation on the reduction of bacteria and endotoxins in root canals: a randomized clinical trial.

AIM: This randomized clinical trial aimed to compare the effectiveness of ultrasonic activation with that of nonactivated irrigation on the removal of bacteria and endotoxin from root canals. METHODOLOGY: Fifty patients with necrotic pulps and asymptomatic apical periodontitis were randomly allocated into two groups according to the final irrigation protocol after root canal preparation: Group UI - ultrasonic irrigation (n = 25) and Group NI - needle irrigation (n = 25). The root canals were medicated with calcium hydroxide for 14 days. Microbiological sampling was performed before (S1) and after the root canal preparation (S2), after the irrigation protocols (S3) and after the removal of the intracanal medication (S4). Total bacteria counts were determined by qPCR and the endotoxin levels by the limulus amebocyte lysate assay. Intragroup analyses were performed using the Wilcoxon test for related samples, whereas intergroup analyses were performed using the Mann-Whitney U-test (P < 0.05). RESULTS: All S1 samples were positive for bacteria, with median numbers of 1.49 × 106 and 8.55 × 105 bacterial cells for the UI and NI groups, respectively. This number significantly decreased in S2 samples (UI: 1.41 × 104 ; NI: 3.53 × 104 ; both with P < 0.001). After final irrigation protocols, there was a significant decrease in bacterial load from S2 to S3 samples in both groups (UI: 4.29 × 103 ; NI: 1.08 × 104 ; P < 0.01). Intergroup analysis revealed a significant difference between irrigation methods regarding bacterial counts in S3 samples (P < 0.05). In contrast, no significant differences were observed between groups for endotoxin levels (P > 0.05). CONCLUSIONS: Ultrasonic activation was more effective than nonactivated irrigation for reducing the number of bacteria but not the endotoxin levels in root canals of teeth with apical periodontitis.

Técnicas de citologia aspirativa, biópsia e citobloco de medula óssea para identificação e determinação de intensidade parasitária na leishmaniose visceral canina / Techniques of aspiration cytology, biopsy and cell block of the bone marrow for the identification and determination of parasite intensity in Canine Visceral Leishmaniasis

O objetivo com este estudo foi comparar as técnicas de citologia aspirativa, biópsia e citobloco para identificação e quantificação parasitológica de Leishmania (Leishmania) infantum chagasi em medula óssea de cães. Amostras de tecido medular de 26 animais, em diferentes estágios clínico-laboratoriais da doença, foram estudadas obedecendo-se os mesmos critérios de investigação nas técnicas de citologia aspirativa, biópsia e citobloco. O menor número de campos para a confirmação parasitológica foi constatado no esfregaço direto obtido por citologia aspirativa. O estágio clínico-laboratorial não influenciou no número de campos necessários para a primeira visualização do agente em nenhuma das técnicas (p>0,05), e menor intensidade parasitária foi observada nas lâminas de citobloco. As técnicas de citologia aspirativa e biópsia concordaram na estimativa do coeficiente de infectividade no tecido estudado (p<0,05). Apesar de a técnica de citobloco permitir a concentração de células e o melhor reaproveitamento de amostras, não demonstrou ser um método adequado para rápida identificação e quantificação parasitológica na leishmaniose visceral canina. Considerando-se suas vantagens, a citologia aspirativa foi o melhor método para detecção microscópica do parasito e determinação do nível de intensidade parasitária no tecido estudado.(AU)

The aim of the present study was to compare the aspiration cytology, biopsy and cell block techniques for identification and parasitological quantification of Leishmania (Leishmania) infantum chagasi in dog bone marrow. Bone marrow tissue samples from 26 animals, in different clinical-laboratory stages of the disease, were studied according to the same criteria of investigation in the aspiration cytology, biopsy and cell block techniques. The lowest number of fields for the parasitological confirmation was found in the direct smear obtained by aspiration cytology. The clinical-laboratory stage did not influence the number of fields required for the first visualization of the agent in any of the techniques (p> 0.05) and less parasitic intensity was observed in the cell block slides. The aspiration cytology and biopsy techniques agreed on the estimation of infectivity coefficient in the tissue studied (p< 0.05). Although the cell block technique allows the concentration of cells and better reutilization of samples, it has not been shown to be an adequate method for rapid identification and parasitological quantification in canine visceral leishmaniasis. Considering its advantages, aspiration cytology was the best method for microscopic detection of the parasite and determination of the level of parasite intensity in the tissue studied.(AU)

Substituição do milho moído pela glicerina como aditivo em silagem de capim-elefante / Replacement of ground corn with glycerin in elephant grass silage

This study was performed to test the linear inclusion of crude glycerin (86% purity) replacing ground corn as an additive mixed with elephant grass forage for silage, evaluating the nutritional quality of the food and the viability of silage. Five levels of glycerin as corn substitute were tested, ranging from 3.12 to 12.5% of total forage green matter, in addition to a control treatment (forage only). Bromatological and digestibility analyses were carried out to evaluate the nutritional value of the mixture during ensiling and of the silage after the fermentation process. The pH, ammoniacal nitrogen, dry matter recovery, and density were measured to evaluate the fermentative quality. The inclusion of ground corn increased (P<0.05) by 28% the dry matter content in both fresh forage and silage. The inclusion of corn and its substitution with glycerin improved (P<0.05) by 25 and 32% in in situ digestibility and the energy value of the food, respectively, when compared to the control treatment. This finding was due to a decrease (P<0.05) in neutral detergent fiber and acid detergent fiber in silage. The inclusion of glycerin increased (P<0.05) crude protein losses during fermentation and decreased dry matter recovery. The dry matter content of forage seems to be a key factor for the successful inclusion of glycerin as additive in elephant grass silage in order to avoid expressive losses in nutritional quality during the fermentation process.

Objetivou-se com este estudo testar o aumento linear da inclusão de glicerina bruta (86% de pureza) em substituição ao milho moído, como aditivo, na forragem de capim-elefante destinada a ensilagem, avaliando-se a qualidade nutricional do alimento e a viabilidade da ensilagem do material. Foram testados cinco níveis de substituição do milho pela glicerina em taxas que variaram de 3,12 a 12,5% sobre a matéria natural da forragem, além de um tratamento controle (apenas forragem). Realizaram-se análises bromatológicas e de digestibilidade para avaliar o valor nutricional da mistura durante a ensilagem e após o processo fermentativo, na silagem. Para avaliar a qualidade fermentativa foram feitas avaliações de pH, nitrogênio amoniacal, recuperação de matéria seca e densidade. A inclusão do milho moído incrementou (P<0,05) o teor de matéria seca em até 28%, tanto na forragem fresca, bem como na silagem. Tanto a inclusão do milho, bem como a substituição deste pela glicerina resultou (P<0,05) em um incremento médio de 25% e 32% na digestibilidade in situ e valor energético da silagem, respectivamente quando comparado ao capim puro. Isto, devido ao decréscimo (P<0,05) dos teores de fibra em detergente neutro e fibra em detergente ácido na silagem. A inclusão de glicerina aumentou (P<0,05) as perdas de proteína bruta durante a fermentação e diminuiu a recuperação da matéria seca. O teor de matéria seca da forragem parece ser fator chave para o sucesso de inclusão da glicerina como aditivo na ensilagem do capim-elefante, no intuito de evitar perdas expressivas de qualidade nutricional durante a fermentação.

Substituição do milho moído pela glicerina como aditivo em silagem de capim-elefante / Replacement of ground corn with glycerin in elephant grass silage

This study was performed to test the linear inclusion of crude glycerin (86% purity) replacing ground corn as an additive mixed with elephant grass forage for silage, evaluating the nutritional quality of the food and the viability of silage. Five levels of glycerin as corn substitute were tested, ranging from 3.12 to 12.5% of total forage green matter, in addition to a control treatment (forage only). Bromatological and digestibility analyses were carried out to evaluate the nutritional value of the mixture during ensiling and of the silage after the fermentation process. The pH, ammoniacal nitrogen, dry matter recovery, and density were measured to evaluate the fermentative quality. The inclusion of ground corn increased (P<0.05) by 28% the dry matter content in both fresh forage and silage. The inclusion of corn and its substitution with glycerin improved (P<0.05) by 25 and 32% in in situ digestibility and the energy value of the food, respectively, when compared to the control treatment. This finding was due to a decrease (P<0.05) in neutral detergent fiber and acid detergent fiber in silage. The inclusion of glycerin increased (P<0.05) crude protein losses during fermentation and decreased dry matter recovery. The dry matter content of forage seems to be a key factor for the successful inclusion of glycerin as additive in elephant grass silage in order to avoid expressive losses in nutritional quality during the fermentation process.(AU)

Objetivou-se com este estudo testar o aumento linear da inclusão de glicerina bruta (86% de pureza) em substituição ao milho moído, como aditivo, na forragem de capim-elefante destinada a ensilagem, avaliando-se a qualidade nutricional do alimento e a viabilidade da ensilagem do material. Foram testados cinco níveis de substituição do milho pela glicerina em taxas que variaram de 3,12 a 12,5% sobre a matéria natural da forragem, além de um tratamento controle (apenas forragem). Realizaram-se análises bromatológicas e de digestibilidade para avaliar o valor nutricional da mistura durante a ensilagem e após o processo fermentativo, na silagem. Para avaliar a qualidade fermentativa foram feitas avaliações de pH, nitrogênio amoniacal, recuperação de matéria seca e densidade. A inclusão do milho moído incrementou (P<0,05) o teor de matéria seca em até 28%, tanto na forragem fresca, bem como na silagem. Tanto a inclusão do milho, bem como a substituição deste pela glicerina resultou (P<0,05) em um incremento médio de 25% e 32% na digestibilidade in situ e valor energético da silagem, respectivamente quando comparado ao capim puro. Isto, devido ao decréscimo (P<0,05) dos teores de fibra em detergente neutro e fibra em detergente ácido na silagem. A inclusão de glicerina aumentou (P<0,05) as perdas de proteína bruta durante a fermentação e diminuiu a recuperação da matéria seca. O teor de matéria seca da forragem parece ser fator chave para o sucesso de inclusão da glicerina como aditivo na ensilagem do capim-elefante, no intuito de evitar perdas expressivas de qualidade nutricional durante a fermentação.(AU)

Técnicas de citologia aspirativa, biópsia e citobloco de medula óssea para identificação e determinação de intensidade parasitária na leishmaniose visceral canina / Techniques of aspiration cytology, biopsy and cell block of the bone marrow for the identification and determination of parasite intensity in Canine Visceral Leishmaniasis

O objetivo com este estudo foi comparar as técnicas de citologia aspirativa, biópsia e citobloco para identificação e quantificação parasitológica de Leishmania (Leishmania) infantum chagasi em medula óssea de cães. Amostras de tecido medular de 26 animais, em diferentes estágios clínico-laboratoriais da doença, foram estudadas obedecendo-se os mesmos critérios de investigação nas técnicas de citologia aspirativa, biópsia e citobloco. O menor número de campos para a confirmação parasitológica foi constatado no esfregaço direto obtido por citologia aspirativa. O estágio clínico-laboratorial não influenciou no número de campos necessários para a primeira visualização do agente em nenhuma das técnicas (p>0,05), e menor intensidade parasitária foi observada nas lâminas de citobloco. As técnicas de citologia aspirativa e biópsia concordaram na estimativa do coeficiente de infectividade no tecido estudado (p<0,05). Apesar de a técnica de citobloco permitir a concentração de células e o melhor reaproveitamento de amostras, não demonstrou ser um método adequado para rápida identificação e quantificação parasitológica na leishmaniose visceral canina. Considerando-se suas vantagens, a citologia aspirativa foi o melhor método para detecção microscópica do parasito e determinação do nível de intensidade parasitária no tecido estudado.(AU)

The aim of the present study was to compare the aspiration cytology, biopsy and cell block techniques for identification and parasitological quantification of Leishmania (Leishmania) infantum chagasi in dog bone marrow. Bone marrow tissue samples from 26 animals, in different clinical-laboratory stages of the disease, were studied according to the same criteria of investigation in the aspiration cytology, biopsy and cell block techniques. The lowest number of fields for the parasitological confirmation was found in the direct smear obtained by aspiration cytology. The clinical-laboratory stage did not influence the number of fields required for the first visualization of the agent in any of the techniques (p> 0.05) and less parasitic intensity was observed in the cell block slides. The aspiration cytology and biopsy techniques agreed on the estimation of infectivity coefficient in the tissue studied (p< 0.05). Although the cell block technique allows the concentration of cells and better reutilization of samples, it has not been shown to be an adequate method for rapid identification and parasitological quantification in canine visceral leishmaniasis. Considering its advantages, aspiration cytology was the best method for microscopic detection of the parasite and determination of the level of parasite intensity in the tissue studied.(AU)

Eating flowers? Exploring attitudes and consumers' representation of edible flowers.

Edible flowers have gained more attention in recent years thanks to their perceived health benefits. Despite this attention, it seems that edible flowers are not popularized for consumption in South America, being considered unfamiliar for some cultures from this continent. In this context, the general goal of the present study was to investigate the three dimensions of social representation theory, the representational field, the information and the attitude of the two conditions of edible flowers: a more general "food made with flowers" and more directional product "yoghurt made with flowers", using Brazilian consumers. To achieve this goal, a free word association task was applied. A total of 549 consumers participated in this study. Participants were divided into two conditions, in which the inductor expressions for the free word association task changed: (a) food products made with flowers and (b) yoghurt made with flowers. Results showed a very positive attitude to both situations, and consumers associated Food products made with flowers to "health care" while the central core of yoghurt made with flowers reflected the innovative condition of this product, supported here by their unpredictable character (information generated).

Testicular Structure and Seminal Pathway in the Yellowtail Tetra Astyanax altiparanae (Characiforms: Characidae).

This study aimed to describe testicular and its main ducts structure in the yellowtail tetra Astyanax altiparanae, contributing to the knowledge of the region in which semen is produced, storage and released, focusing mainly on the dynamic of germinal epithelium and Sertoli cells during germ cell maturation. Ten sexually mature male A. altiparanae had their testes processed according to the routine protocols to optical microscopy. Moreover, spermatic ducts and tubular compartment of the testes of three specimens were perfused with vinyl resin for gross anatomy and scanning electron microscopy. Astyanax altiparanae testes are paired organs, separated for most of their extension, joining posteriorly in a spermatic duct formed by a squamous simple epithelium. Seminiferous compartment presents anastomosing tubular type organisation, and spermatogonia spread along its extent. Spermatogenesis is of cystic type, and there is no main testicular duct. Spermatogenesis develops in 'waves', from posterior to anterior part of the gonad. Thus, while sperm is storage posteriorly, spermatogenesis keeps maturing germ cells anteriorly, making the germinal epithelium very dynamic, holding Sertoli cells that change their function as a cystic envelope to produce secretions of the seminal fluid and store sperm. Such kind of development is thought to be responsible by the high prolificacy of this species.