In the criminal sphere, it is extremely important to identify perpetrators of crimes based on latent fingerprints (invisible to the naked eye) revealed at crime scenes and their corresponding objects. The present work aimed to evaluate four synthetic analogues of curcumin as possible IDL developers, and to compare their results with those of carbon black developer, as well as to reach the most adequate parameters in the use of the LTQ and FT-ICR mass spectrometers with the paper spray ionization (PS) source to study the chemical composition of the endogenous substances contained in the IDL. For this, a 24-1 factorial design was developed, where it was verified that the distance and voltage factors were the most influential for the increase in the response of signals, in the analysis of latent fingerprints by PS. Among the detected substances we can mention around 20 fatty acids, and squalene. Finally, four potential developers, synthetic analogues of curcumin, were compared with carbon black developer. The revelation of latent fingerprints occurred efficiently, allowing the visualization of minutiae, such as bifurcation and end of line, making it possible to classify them, according to the Vucetich Fingerprint Classification System.

ABSTRACT This study aimed to evaluate the efficiency of a body condition score (BCS) assessment device (BCAD) to identify cows with an adequate BCS and, presumably, a higher fertility when subjected to timed artificial insemination (TAI). We evaluated cows at smallholder dairy farms in the state of Rondonia, Brazil. Crossbred dairy cows (n = 141) were subjected to a TAI protocol and classified according to the BCAD scale as low BCS (red; n = 55) or adequate BCS (green; n = 86). The outcome pregnancy per artificial insemination (P/AI) was analyzed by logistic regression. Cows classified as green by the BCAD had a significantly greater P/AI (41 of 86; 47.7%) than cows classified as red (15 of 55; 27.3%; P = 0.01). In conclusion, the BCS assessment device was an effective tool to detect cows more likely to become pregnant due to their adequate BCS and, consequently, better fertility in TAI.

RESUMO Este estudo investigou a eficiência de um dispositivo avaliador de ECC (escore de condição corporal) (DAEC) para identificar vacas com ECC adequado e, presumivelmente, com fertilidade mais alta quando submetidas a protocolos de inseminação artificial em tempo-fixo (IATF). Conduzimos o estudo em pequenas propriedades leiteiras no estado de Rondônia, Brasil. Vacas leiteiras mestiças (n = 141) foram submetidas a um protocolo de IATF e classificadas de acordo com a escala do DAEC em vacas com ECC baixo (vermelho; n = 55) ou ECC adequado (verde; n = 86). A prenhez por inseminação artificial (P/IA) foi analisada por regressão logística. Vacas classificadas como verde no DAEC apresentaram P/IA significativamente mais alto (41 de 86; 47,7%) que vacas classificadas como vermelho (15 de 55; 27,3%; P = 0,01). Conclui-se que o dispositivo avaliador de ECC é uma ferramenta eficiente para detectar vacas com adequado ECC e com consequente maior fertilidade na IATF.

The copper alloy UNS-C27200 is a binary brass, composed of 38wt%Zn, beeing one of the most used in the industry. The union of Cu-Zn alloys by conventional welding by fusion in thin plates presents several challenges. The Friction Stir Welding (FSW) process performs the union of two, or more materials, through a rotating tool that travels throughout the welding region. One the great advantages of FSW is working below the melting point of the material, which reduces the change in the microstructure and properties of the material, when compared to conventional welding processes. Due to the lack of research on FSW process in lap brass joints with thin thicknesses, the present work aims to expand these studies in order to contribute to future research. Eight conditions were evaluated, varying rotation and welding speed. In the best results by visual inspection, analyzes of microstructure, temperature, microhardness and mechanical strength were performed. The better welding results were obtained with ω=1050 rpm and ν=20 mm/min. There was reduction of approximately 50% between Stir Zone and Base metal. The mechanical strength was affected by the pin hole resulting from the process. The microstructure revealed a homogeneous mixture in the stir zone and no defects were detected.

Food additives are chemical substances added to improve organoleptic characteristics, in this context, there are several synthetic dyes, such as sunset yellow, tartrazine, erioglaucine, allura red, indigo carmine, and new coccine, that can also be identified through different analytical techniques such as infrared spectroscopy, UV-Vis spectrophotometry, high performance liquid chromatography with diode array detector and mass spectrometry. Therefore, the objective of this work was to compare methods developed for different analytical techniques, in order to identify the one that presents greater efficiency in certain applications. For this, the patterns of the dyes were analyzed, as well as their mixtures and foods that had them. As a result, the CLAE-DAD presents excellent selectivity and linearity of the calibration curves, but it presents higher LD and LQ values when compared to the UV-Vis, in turn the infrared provides information regarding functional groups and bonds. Mass spectrometry showed great capabilities in identifying the molecular formula and better selectivity in the absence of the erioglaucine dye. It is not feasible to indicate the best or worst analytical approach, but it is possible to point out which one is more suitable for each application. Regarding the quantification capacity, chromatography and UV-Vis are good alternatives, but in mixtures containing more than one dye, CLAE-DAD is more suitable due to the better selectivity. Regarding the identification capacity, mass spectrometry, especially FT-ICR MS, is the most appropriate technique to propose molecular formulas due to its high resolution and mass accuracy. The advantage of FTIR was the easier sample preparation, being able to analyze the dyes in the solid state.

Simple, portable and low-cost experiments as RC and RL series circuits are proposed to experiment with DC circuits. Very common elements are used: a few electronics components (resistors, capacitors, coils and connecting wires) and two smartphones. We consider the charging and discharging of a capacitor in the RC circuit and also that of coil in the RL circuit. Using a smartphone as an oscilloscope we observe voltages variations which are the transient response to a square signal generated in the second smartphone. These voltage variations are directly related to the electrostatic or magnetic energy stored in the circuits. The experimental data have been collected with the smartphone used as an oscilloscope and corroborated with theoretical predictions based on Kirchhoff’s laws. The comparison showed differences of the order of the 1% or less between the calculated capacitance or inductance compared to the manufacturer values. This approach which avoids the use of expensive signal generators, oscilloscopes, or any specialized hardware can be performed in less-favored contexts and even as a home assignment.

Resumen El carcinoma hepatocelular (HCC) es el tumor primario más frecuente del hígado, con 905 677 casos diagnosticados en 2020, en todo el mundo, y 830 180 muertes. Es responsable de la novena causa de muerte por cáncer en los hombres y la décima en mujeres en Argentina. A diferencia de otros tumo res de alta prevalencia, la evidencia científica acerca del HCC se limita principalmente a pequeñas cohortes y estudios retrospectivos. El objetivo de este estudio fue describir epidemiológicamente a aquellos pacientes con diagnóstico de HCC en el Hospital Italiano de Buenos Aires en un periodo de 12 años. La supervivencia global para nuestra cohorte fue de 58, 46 y 36% a 1, 3 y 5 años respectivamente. El promedio de supervivencia en pacientes con tratamiento paliativo fue de 5 meses, 23 para aquellos que recibieron tratamientos no curativos y 75 meses para los que recibieron tratamientos curativos. El porcentaje de pacientes libres de enfermedad a 1, 3 y 5 años fue de 89%, 76% y 61% respectivamente. Se realizó un estudio minucioso de la etiología, factores de riesgo, incidencia, mortalidad y tratamientos realizados. Su importancia yace en su tamaño muestral, calidad y cantidad de información disponible.

Abstract Hepatocellular carcinoma is the most common primary liver tumor, with 905 677 diagnosed cases and 830 180 deaths, in 2020 worldwide. In Argentina, it accounts for the 9th cause of death for cancer in men and the 10th in women. Unlike other highly-prevalent tumors, scientific evidence for most therapeutic options is limited mainly to small cohorts and retrospective studies. The aim of this study is to characterize and describe epidemiologically patients with diagnosis of hepatocellular carcinoma in the Italian Hospital of Buenos Aires during a 12-year period. Overall survival for our cohort was 58%, 46%, and 36% at 1, 3 and 5 years respectively. Average survival for patients receiving palliative treatment was 5 months, while for those who received either non-curative or curative treatment was 23 and 75 months respectively. Recurrence-free survival for those patients who under went a curative treatment was 89%, 76% y 61% at 1, 3 and 5 years. A thorough analysis of etiology, risk factors, incidence, mortality and treatment was made. The study’s importance lies in its large sample size, quantity and quality of data, and will most certainly stimulate the development of local studies in hepatocellular carcinoma.

The antifungal potential of volatile organic compounds (VOCs) produced by actinobacterial strains Streptomyces sp. (ACTB-77) and Amycolatopsis sp. (ACTB-290) from the rhizosphere of Caatinga plants against Colletotrichum musae was investigated. VOCs produced by these microorganisms (axenic and co-culture) were investigated using headspace-solid phase micro-extraction (HS-SPME) and gas chromatography-mass spectrometry (GC-MS). Although no exclusive VOC peaks were observed in the co-culture with ACTB-77, the same experiment involving ACTB-290 yielded five new peaks, including two identified alcohols, suggested as bioreductive products of the corresponding ketones by the fungus. Statistical analysis revealed that co-culture ACTB-77/C. musae has a closer similarity to the fungus than to the actinobacteria, while the co culture ACTB-290/C. musae showed closer similarity to the actinobacteria. These confirmed the more pronounced antifungal activity of the ACTB-290 strain, as observed in the fungus growth inhibition experiments. The antifungal activity of ACTB-290 was associated to its sulfur-containing metabolites, while linalool was suggested as responsible for the ACTB-77 activity.

RESUMO O presente estudo teve como objetivo analisar a relação entre conflito intra-grupo e desempenho percebido no final da temporada, e examinar como a eficácia coletiva atua como uma variável mediadora nesta associação. Participaram 420 jogadores semiprofissionais e amadores (M = 22,40; DT = 4,71) de basquete, handebol, futebol e voleibol. Os resultados mostraram que o conflito intra-grupo (trabalho de casa e social) estava negativamente relacionado ao desempenho percebido da equipe e que a eficácia coletiva apresentou resultados significativos atuando como mediador entre a relação do conflito intra-grupo (trabalho de casa e social) e o desempenho percebido da equipe. Portanto, é importante destacar que o conflito intra-grupo parece agravar o funcionamento coletivo da equipe e que a eficácia coletiva pode amenizar essa relação negativa, conseguindo um aumento na percepção do desempenho da equipe no final da temporada.

RESUMEN El presente estudio tuvo como objetivo analizar la relación entre el conflicto intra-grupo y el rendimiento percibido a final de temporada, y examinar como actúa la eficacia colectiva como variable mediadora en esta asociación. Participaron 420 jugadores semi-profesionales y amateurs (M = 22,40; DT = 4,71) de baloncesto, balonmano, fútbol y voleibol. Los resultados mostraron que el conflicto intra-grupo (tarea y social) se relacionó negativamente con el rendimiento percibido del equipo, y que la eficacia colectiva mostró resultados significativos actuando como mediadora entre la relación de el conflicto intra-grupo (tarea y social) y el rendimiento percibido del equipo. Por lo tanto, es importante destacar que los conflictos intra-grupo parecen empeorar las percepciones sobre el rendimiento grupal y que la eficacia colectiva puede suavizar esta relación negativa, consiguiendo un aumento en el la percepción de los jugadores sobre el rendimiento del equipo a final de temporada.

ABSTRACT The present study aimed to analyze the relationship between intra-group conflict and team perceived performance at the end of the season, and to examine the mediating effect of collective efficacy on this relationship. 420 semi-professional and amateur players (M = 22,40; SD = 4,71) of basketball, handball, soccer and volleyball participated. The results showed that intra-group conflict (task and social) was negatively related to team performance and collective efficacy showed significant results acting as a mediator between the relationship of intra-group conflict (task and social) and team perceived performance. Therefore, it is important to highlight that intra-group conflict seems to worsen the collective functioning and that collective efficacy can soften this negative relationship, achieving an increase in team performance at the end of the season.

Resumen La radioterapia es parte del tratamiento multidisciplinario del cáncer de mama y recientemente se han expandido sus indicaciones. Existe una asociación entre radioterapia posmastectomía y malos resultados reconstructivos, ya que aumenta la tasa de complicaciones. El tiempo idóneo para dar radioterapia posmastectomía sigue sin estar definido y existen tres algoritmos generales para indicar esta adyuvancia: 1) directamente al implante; 2) al expansor tisular después del primer tiempo, o 3) al implante definitivo después del segundo tiempo. En el contexto reconstructivo se debe considerar que la radioterapia es una parte integral del tratamiento y hasta el momento no existe una recomendación definitiva.

Abstract Radiation therapy is part of the multidisciplinary plan for breast cancer care and recently, its indications have expanded. There is an association between postmastectomy radiotherapy and poor reconstructive outcomes given the increased risk for complications. The optimal timing for postmastectomy radiotherapy remains unclear and there are three general algorithms for this adjuvant therapy. 1) Direct to implant. 2) To tissue expander after first stage of reconstruction or 3) To implant after second stage of reconstruction. In the context of reconstructive surgery, it should be considered that radiotherapy is part of the global treatment and that there is no definitive recommendation at the moment.

Abstract Drawing on the transformational leadership theory, this study aimed to analyze the psychometric properties of a version adapted to the educational environment of the Multifactor Leadership Questionnaire (MLQ-5X). A total of 1551 Spanish students (M = 15.47 years ± 0.72; 679 boys and 872 girls) from 31 secondary schools participated in the study. The confirmatory factor analysis of the initial nine-factor structure of the scale determined the need to eliminate two items of the passive exception management factor, grouping passive leadership into a single factor. A second eight-factor model found high correlations between the factors of transformational leadership, revealing the need to establish a first-order factor. Finally, a third model, which obtained adequate values of validity and reliability, was composed of 34 items distributed in 4 main factors (transformational leadership, contingent reward, leadership by active exception, and passive leadership) and 5 secondary factors for transformational leadership (idealized influence behavior, attributed idealized influence, inspirational motivation, intellectual stimulation, and individualized consideration). The Spanish version of the MLQ-5X in the educational field can be used to assess the students' perception of teacher leadership.

Resumen Desde la teoría del liderazgo transformacional, este estudio tenía como objetivo analizar las propiedades psicométricas de una versión adaptada al ámbito educativo del Multifactor Leadership Questionnaire (MLQ-5X). Un total de 1551 estudiantes españoles (M = 15,47 años ± 0,72; 679 chicos y 872 chicas) de 31 centros de secundaria participaron en el estudio. El análisis factorial confirmatorio de la estructura inicial de nueve factores de la escala determinó necesario eliminar dos ítems del factor dirección por excepción pasiva, agrupando en un solo factor el liderazgo pasivo. Un segundo modelo de ocho factores encontró altas correlaciones entre los factores del liderazgo transformacional, haciendo necesario establecer un factor de primer orden. Finalmente, un tercer modelo obtuvo valores adecuados de validez y fiabilidad, compuesto por 34 ítems distribuidos en 4 factores principales (liderazgo transformacional, recompensa contingente, dirección por excepción activa y liderazgo pasivo) y 5 factores secundarios para el liderazgo transformacional (influencia idealizada conducta, influencia idealizada atribuida, motivación inspiracional, estimulación intelectual y consideración individualizada). Por tanto, la versión española del MLQ-5X en el ámbito educativo puede utilizarse para evaluar el liderazgo docente desde la percepción del alumnado.

Resumen La endometriosis extrauterina es una enfermedad poco frecuente que afecta a mujeres en edad reproductiva. La cavidad pleural es una de las localizaciones más frecuentes en este tipo de patología y es en ella donde se puede encontrar con mayor frecuencia neumotórax de repetición seguido por hemotórax. La afectación parenquimatosa, al igual que el hemotórax, es poco frecuente1. Presentamos el caso de una mujer en edad fértil con hemotórax debido a endometriosis pleural.

Abstract Extrauterine endometriosis is a rare disease that affects women of childbearing age. The pleural cavity is one of the most common locations of this type of disease and the place where recurrent pneumothorax followed by haemothorax most frequently occur. Paren chymal involvement and haemothorax aren’t very frequent1. We present the case of a woman of childbearing age with haemothorax due to pleural endometriosis.

Abstract Takotsubo cardiomyopathy is an entity characterized by acute and transient ventricular dysfunction, which is usually related to a triggering event (emotional or physical stress), and usually presents with regional systolic dysfunction of the left ventricle, however up to 30% may be biventricular. Depending on its severity in some cases the disease can condition refractory cardiogenic shock to management with inotropics and vasopressors, so for these cases circulatory assistance devices should be considered. We present the case of a young patient who had pulmonary valve change with biological prosthesis, which seven weeks after surgery went to the emergency department with pericardial effusion and tamponade physiology secondary to postpericardiotomy syndrome. For this reason pericardial window was practiced, however during the procedure she presented biventricular Takotsubo cardiomyopathy which conditioned cardiogenic shock with severe mitral and tricuspid regurgitation, and refractivity to medical treatment as well as intraaortic balloon pump, requiring circulatory support with venoarterial ECMO for 5 days.

Resumen La cardiomiopatía de Takotsubo es una entidad caracterizada por disfunción ventricular aguda y transitoria, la cual está generalmente relacionada a un evento desencadenante (estrés emocional o físico) y que, por lo general, se presenta con disfunción sistólica regional del ventrículo izquierdo, aunque hasta en un 30% puede ser biventricular. Según su severidad, en algunos casos puede condicionar choque cardiogénico refractario a manejo con inotrópicos y vasopresores, por lo que para estos casos deben considerarse los dispositivos de asistencia circulatoria. Presentamos el caso de una paciente joven a quien se realizó cambio valvular pulmonar con prótesis biológica, la cual siete semanas posteriores a la cirugía acudió al servicio de urgencias con derrame pericárdico y fisiología de tamponade secundario a síndrome pospericardiotomía. Por tal motivo se le practicó ventana pericárdica, sin embargo durante el transquirúrgico presentó cardiomiopatía de Takotsubo biventricular que le condicionó choque cardiogénico con insuficiencia mitral y tricúspidea severas y refractariedad a tratamiento médico, así como a balón intraaórtico de contrapulsación (BIAC), por lo cual requirió soporte circulatorio con ECMO venoarterial durante 5 días.