We report the electrochemical potential of conductive filaments produced with recycled polylactic acid (rPLA) alongside a mixture of graphite (Gpt) and/or carbon black (CB) and castor oil to create an electrode ready-to-use. Additively-manufactured electrodes (AMEs) were compared with commercial-conductive filament composed of PLA and CB. The Gpt-CB-rPLA and CB-rPLA sensors showed lower charge-transfer resistance (Rct) and a greater heterogenous rate constant, k0, (Rct= 1040 ± 50 Ω and 1810 ± 30 Ω and k0= 6.91 (± 0.58) × 103 and 5.31 (± 0.40) × 103 cm s-1, respectively) compared to the sensor from the commercial filament (Rct = 9620 ± 280 Ω and k0 = 3.62 (± 0.38) ×10-3 cm s-1). The electrochemical response of [Fe(CN6)]3-/4- displayed a peak-to-peak separation of 180 ± 8 mV (Gpt-CB-rPLA) and 240 ± 6 mV (CB-rPLA) compared to commercial AME (740 ±10 mV), without any surface treatment. The filaments were used to create a 2,4,6-trinitrotoluene (TNT) detection platform with linear range of 5-20 and 5-100 µmol L-1 for Gpt-CB-rPLA and CB-rPLA, respectively. The collector-detector device was applied for the analysis of a blast simulation. Finally, it is worth noting that the results obtained are without electrode treatment/activation, indicating that the rough surface of the additively manufactured electrode is an additional feature of the device for collecting explosive residues, simply by rubbing the additively manufactured platform on different surfaces in crime scenarios. rPLA (rPLA Gpt (Gpt andor or CB (CB readytouse. readytouse ready use. use ready-to-use Additivelymanufactured Additively AMEs (AMEs commercialconductive GptCBrPLA CBrPLA chargetransfer charge transfer Rct constant k Rct= 104 5 181 3 691 91 6.9 ( 0.58 058 0 58 10 531 31 5.3 0.40 040 40 s1, s1 s 1, 1 s-1 respectively 962 28 362 62 3.6 0.38 038 38 ×103 ×10 ×10- s1. . s-1) FeCN63/4 FeCN634 FeCN Fe CN6 /4 4 CN [Fe(CN6)]3-/4 peaktopeak peak 18 (Gpt-CB-rPLA 24 (CB-rPLA 740 (74 ±1 mV, , mV) treatment 2,4,6trinitrotoluene 246trinitrotoluene trinitrotoluene 2,4,6 2 TNT (TNT 520 20 5-2 5100 100 5-10 L1 L L- CBrPLA, rPLA, collectordetector collector detector simulation Finally treatmentactivation activation treatment/activation residues scenarios 69 9 6. 0.5 05 53 5. 0.4 04 s- 96 36 3. 0.3 03 ×1 FeCN63 FeCN63/ / [Fe(CN6)]3-/ 74 (7 6trinitrotoluene 246 2,4, 52 5- 510 5-1 0. FeCN6 [Fe(CN6)]3- 7 2,4 51 [Fe(CN6)]3 2, [Fe(CN6)] [Fe(CN6) [Fe(CN6 [Fe(CN

In this study, it was investigated chitosan (CHIT) films in the presence or absence of cellulose nanofibers (CNF) and silver nanoparticles (AgNP), whose chemical interactions involving metallic surfaces were characterized by surface-enhanced Raman scattering (SERS) spectroscopy. Changes in the morphology were analyzed through atomic force microscopy (AFM) and scanning electron microscopy (SEM). SEM and AFM micrographs revealed that the incorporation of CNF significantly altered CHIT films, leading to changes in the polymer topography and surface texture due to intimal interactions between CNF and the CHIT matrix. Raman spectra of CHIT and CNF/CHIT films showed similar profiles, reflecting comparable molecular structures of both modified biopolymers. However, SERS spectra of both films, after recovering with AgNP, demonstrated distinct spectral profiles. Innovatively, density functional theory (DFT) calculations of an oligomer model for CHIT were employed to assign the vibrational modes observed in the SERS spectra, which allowed identify key interactions between CHIT moieties and AgNP surfaces. SERS results revealed that chemical adsorption of CHIT on AgNP surfaces occurs through interactions of glycosidic oxygen and amino groups. Such findings provide insights into the structural and chemical behavior of this nanocomposite, highlighting its potential for advanced biological applications. study (CHIT (CNF , (AgNP) surfaceenhanced enhanced (SERS spectroscopy (AFM SEM. . (SEM) matrix CNFCHIT profiles biopolymers However Innovatively DFT (DFT groups nanocomposite applications (AgNP (SEM

Serial numbers are marks present on several day-to-day objects, created by manufacturers for purposes such as quality control, product tracking and to prevent counterfeiting. In the case of firearms, these characters can be obliterated or damaged by natural processes or intentionally by criminals to prevent positive identification of stolen property. One non-destructive method employed by crime laboratories for the restoration of obliterated characters is the magnetic particle method. The present work aims to study the synthesis and application of waste-made magnetic nanoparticles in the recovery of adulterated markings. A set of analytical-grade materials and metallic waste magnetic nanoparticles were synthesized for comparison purposes. Chemical characterization tests by X-ray fluorescence, morphological tests by scanning electron microscopy (SEM), and magnetization tests by vibrating sample magnetometer (VSM) were performed. The efficacy of the synthesized nanoparticles was tested on 1020 steel plates previously engraved and adulterated by sanding. Both homemade magnetic nanoparticles demonstrated superior performance compared to commercial magnetic particles. The application of homemade magnetic particles, especially using waste as the source of production, decreases the cost of the material and is environmentally friendly. The development of this material makes magnetic serial number restoration a better option for widespread use in forensic procedures. daytoday day objects control counterfeiting firearms property nondestructive non destructive wastemade made markings analyticalgrade analytical grade Xray X ray fluorescence SEM, SEM , (SEM) VSM (VSM performed 102 sanding particles production friendly procedures (SEM 10 1

This study investigated the removal of contaminants in water by adsorption on thermoplastic starch (TPS) and kraft lignin (KL) composites. A study on the desorption of methylene blue (MB) and methyl orange (MO) dyes in water was also carried out, followed by the photodegradation of solutions containing dissolved dyes. Initially, the surface morphology of the TPS and TPS-KL films was analyzed by scanning electron microscopy, revealing advantageous characteristics for efficient adsorption of contaminants. Fourier transform infrared spectroscopy (FTIR) analysis made it possible to characterize the TPS and TPS-KL composites. The results demonstrate the reversibility of the process and confirm the lack of permanent chemical modification in the polymer matrix, indicating that the adsorption/desorption process is physical rather than chemical. This suggests that the adsorbent material can be reused without losing its fundamental structural properties. Furthermore, the study allows for verification of the chemical changes on the surfaces of the materials involved. Ultraviolet-visible spectroscopy (UV-Vis) results show that for MO, both substrates exhibited low adsorption capacity, with efficiency values close to 20%. In contrast, for MB, both composite materials displayed excellent dye adsorption rates, achieving efficiencies of 78% or higher. The photodegradation of adsorbed dyes revealed promising results. (TPS KL (KL composites MB (MB MO (MO out Initially TPSKL microscopy FTIR (FTIR matrix adsorptiondesorption properties Furthermore involved Ultravioletvisible Ultraviolet visible UVVis UV Vis (UV-Vis capacity 20 20% contrast rates 78 higher 2 7

ABSTRACT: The main transmission route of bovine coronavirus (BCoV) is direct contact with secretions and feces, and potentially also via contaminated surfaces. Following PRISMA guidelines, a systematic review was conducted to evaluate the presence of BCoV on environmental surfaces. A literature search, conducted between March and April 2023, utilized databases including Web of Science, PubMed, Scopus, Science Direct, and Springer. The review adhered to the PEO structure: Population - environmental surfaces; Exposure - contact with BCoV; Outcome - identification of presence or infectivity. Primary data were recorded using an extraction form organizing methods for detecting BCoV presence, assessing BCoV infectivity, types of surfaces evaluated, and study type. Search terms “Bovine coronavirus” and “BCoV” yielded 2703 articles. After removing 964 duplicates and excluding 1546 articles not mentioning BCoV in titles, 193 studies underwent abstract reading. Following exclusion criteria not addressing BCoV presence in the environment, three articles were selected for comprehensive review. These articles identified BCoV presence on various types of surfaces, with detection possible up to 81 hours after contamination, depending on surface type. Despite limited studies on BCoV presence on surfaces, findings suggested potential transmission via contaminated surfaces due to the virus’s ability to remain infectious for up to 24 hours on fomites. This review underscores the need for further research on BCoV persistence in farm environments, an area currently lacking focused studies. ABSTRACT (BCoV feces guidelines search 2023 PubMed Scopus Direct Springer structure infectivity evaluated type Bovine “BCoV 270 96 154 titles 19 reading environment 8 contamination viruss virus s 2 fomites environments 202 27 9 15 1 20

RESUMO: A principal via de transmissão do coronavírus bovino (BCoV) é o contato direto com secreções e fezes, podendo ocorrer também por meio de superfícies contaminadas. Uma revisão sistemática, seguindo as recomendações PRISMA, foi realizada para avaliar a presença de BCoV em superfícies ambientais. A busca na literatura foi realizada em março e abril de 2023 e as bases de dados utilizadas foram Web of Science, PubMed, Scopus, Science Direct e Springer. A revisão sistemática seguiu a estrutura PEO: População - superfícies ambientais; Exposição - contato com BCoV; Resultado - identificação da presença ou infectividade de BCoV. As informações primárias foram registradas por meio de um formulário de extração, organizando métodos para detectar a presença de BCoV, avaliar a infectividade de BCoV, tipos de superfícies avaliadas e tipo de estudo. Os termos de pesquisa “coronavírus bovino” e “BCoV” resultaram em 2703 artigos. Após remover 964 duplicatas e excluir 1546 artigos que não mencionavam o BCoV nos títulos, 193 estudos foram submetidos à leitura de resumos. Seguindo os critérios de exclusão, que não abordavam a presença do BCoV no ambiente, três artigos foram selecionados para revisão abrangente. Nestes artigos foi identificada a presença de BCoV em vários tipos de superfícies, sendo possível a detecção até 81 horas após a contaminação, dependendo do tipo de superfície. Apesar do número limitado de estudos que investigam a presença de BCoV em superfícies, os resultados sugerem o potencial de transmissão de BCoV por meio de superfícies contaminadas, devido à capacidade do vírus permanecer infeccioso por até 24 horas em fômites. Esta revisão destaca a necessidade de mais pesquisas sobre a persistência de BCoV em locais de criação de bovinos, uma área atualmente carente de estudos específicos. RESUMO (BCoV fezes contaminadas PRISMA ambientais 202 PubMed Scopus Springer PEO extração estudo “BCoV 270 96 154 títulos 19 resumos exclusão ambiente abrangente 8 contaminação superfície 2 fômites bovinos específicos 20 27 9 15 1

ABSTRACT Introduction/framework/objectives Over the last few years, most countries have developed standards relating to reducing the number of places where smoking continues to be possible, particularly in the workplace. This review was intended to summarize the most recent publications on the topic. Methodology This is a Bibliographic Review, initiated through a search carried out in April 2023 in the databases “CINALH plus with full text, Medline with full text, Database of Abstracts of Reviews of Effects, Cochrane Central Register of Controlled Trials, Cochrane Database of Systematic Reviews, Cochrane Methodology Register, Nursing and Allied Health Collection: comprehensive, MedicLatina and RCAAP”. Content Passive Smoking is defined as "second-hand" smoke that encompasses a complex mixture of pollutants, remaining in the dust on local surfaces where it was smoked, consisting of the original tobacco products and the components originating in the direct consumer's breath, eventually reacting to other agents gifts. These can remain on inert surfaces, sometimes for months and transmission can occur by simple touch. Some researchers estimate that there are around 4000 chemical agents in this context, of which 250 are toxic and 50 are even carcinogenic. Tobacco is one of the preventable causes of death worldwide and a modifiable risk factor, through mechanisms that include DNA damage, inflammation and oxidative stress. It involves health costs and reduced labor productivity, due to associated pathologies, namely cardiovascular, respiratory, oncological, obstetric and infectious diseases. Discussion and Conclusions Over the last few decades, there has been a global decrease in passive smoke, due to the introduction of increasingly restrictive standards in relation to places where smoking is still permitted, in society in general and, obviously, in the workplace as well. The selected articles did not highlight the following detail much but, by creating areas where smoking is permitted in the company, these should minimize the exposure of all workers, smokers and, above all, non-smokers. It would be desirable for countries/institutions where standards are less restrictive and/or enforced to change, so that all workers have a safe working environment. Furthermore, it would be interesting to understand what opinion Portuguese workers have regarding this topic, how standards are complied with in their workplaces and what are the most effective techniques to achieve greater success in this context.

RESUMO Introdução/enquadramento/objetivos Ao longo dos últimos anos a generalidade dos países foi desenvolvendo normas relativas à diminuição dos locais onde continua a ser possível fumar, nomeadamente em contexto laboral. Pretendeu-se com esta revisão resumir o que de mais recente se publicou sobre o tema. Metodologia Trata-se de uma Revisão Bibliográfica, iniciada através de uma pesquisa realizada em abril de 2023 nas bases de dados “CINALH plus with full text, Medline with full text, Database of Abstracts of Reviews of Effects, Cochrane Central Register of Controlled Trials, Cochrane Database of Systematic Reviews, Cochrane Methodology Register, Nursing and Allied Health Collection: comprehensive, MedicLatina e RCAAP”. Conteúdo O Tabagismo Passivo é definido como fumo de "segunda mão" que engloba uma mistura complexa de poluentes, permanecendo na poeira das superfícies locais onde se fumou, constituída pelos produtos tabágicos originais e os componentes originários pela respiração do consumidor direto, eventualmente reagindo a outros agentes presentes. Estes podem permanecer nas superfícies inertes, por vezes, por meses e a transmissão pode ocorrer pelo simples toque. Alguns investigadores estimam que existam neste contexto cerca de 4000 agentes químicos, dos quais 250 são tóxicos e 50 são inclusivamente carcinogénicos. O tabaco é uma das causas preveníveis de morte mundialmente e fator de risco modificável, por mecanismos que abarcam o dano de DNA, inflamação e stress oxidativo. Ele implica custos de saúde e de diminuição da produtividade laboral, em função das patologias associadas, nomeadamente cardiovascular, respiratória, oncológica, obstétrica e infeciosa. Discussão e Conclusões Ao longo das últimas décadas verificou-se, globalmente, uma diminuição ao Tabagismo Passivo, devido à introdução de normas cada vez mais restritivas em relação aos locais onde ainda é permitido fumar, na sociedade em geral e, obviamente, em contexto de trabalho também. Os artigos selecionados não realçaram muito o seguinte detalhe mas, criando-se áreas onde é permitido fumar na empresa, estas devem minimizar a exposição de todos os trabalhadores, tabagistas e, sobretudo, não fumadores. Seria desejável que os países/instituições onde as normas são menos restritivas e/ou cumpridas, tal se alterasse, de forma a todos os trabalhadores terem um ambiente laboral seguro. Para além disso, seria interessante perceber qual a opinião que os trabalhadores portugueses têm em relação a este tema, de que forma as normas são cumpridas nos seus locais de trabalho e quais as técnicas mais eficazes para obter mais sucesso neste contexto.

Abstract The conservation of cultural heritage needs to be aligned with current sustainability policies. Therefore, this work aimed to assess the effectiveness of using kaolin residue, either totally or partially replacing bentonite, in Mário Mendonça de Oliveira's formulation for cleaning stone surfaces, in order to measure possible changes in the appearance or structure of Lioz stone. The influence of some variables, such as the application time of the plaster and the concentration of the clay minerals used, was evaluated. The experimental methodology consisted of drying and pulverizing the residue; quantifying and weighing the reagents; wet cleaning the rock; synthesis, application, and removal of the plaster. Throughout the research, analysis techniques were employed to characterize the starting materials, the products formed, and the alterations produced on the rock surface. After the wet cleaning process, there was a trend for increased brightness in all studied ranges, and an increase in brightness in all ranges where 100% kaolin plaster was applied during 7 and 14 days. policies Therefore residue bentonite Oliveiras Oliveira s surfaces variables used evaluated reagents synthesis research materials formed surface process 100 1 days 10

Resumo A conservação de bens culturais necessita estar alinhada com a política de sustentabilidade da atualidade. Assim, este trabalho teve como objetivo avaliar a eficácia do uso do resíduo do caulim substituindo total ou parcialmente a bentonita, na formulação de Mário Mendonça de Oliveira, para a limpeza de superfícies pétreas. E dessa forma avaliar possíveis alterações no aspecto ou na estrutura do lioz. Para tanto foram avaliadas a influência de algumas variáveis, como tempo de aplicação do emplastro e a concentração dos argilominerais utilizados. A metodologia experimental consistiu em: secagem e pulverização do resíduo; quantificação e pesagem dos reagentes; limpeza úmida da rocha; síntese, aplicação e remoção do emplastro. Ao longo da pesquisa foram empregadas técnicas de análise, para caracterizar os materiais de partida, os produtos formados e as alterações produzidas na superfície da rocha. Após a limpeza por via úmida houve uma tendência de elevação de brilho em todas as faixas estudadas; e um aumento do mesmo em todas as faixas em que foi aplicado o emplastro de 100% caulim, para os tempos de 7 e 14 dias. atualidade Assim bentonita Oliveira pétreas lioz variáveis utilizados reagentes rocha síntese análise partida estudadas 100 1 dias 10

Abstract Long-life packaging is being used informally as an alternative to improve thermal insulation in single-family wooden houses. Its usage is backed by environmental concerns to reuse these solid residues as a radiant barrier for heat transmission. However, some published studies have only analyzed its thermal insulation efficiency, without considering the material performance in fire situations. Given this scenario, the objective of this research is to present the analysis and classification to a fire reaction of long-life packaging. In addition to the non-combustibility test, ignitability, radiant wall panel, optical smoke density and single burn item (SBI) tests were carried out. The results showed that the material is combustible and is classified as fire reaction class VI, according to the criteria for special materials. Thus, on the findings of this study, it can be concluded that long-life packaging should not be used as a lining for the internal surfaces of buildings. Longlife Long life singlefamily family houses transmission However efficiency situations scenario longlife long noncombustibility non combustibility test ignitability panel SBI (SBI out VI materials Thus study buildings

Resumo As embalagens do tipo “longa-vida” estão sendo utilizadas, informalmente, como alternativa para melhorar o isolamento térmico em edificações residenciais unifamiliares de madeira. Sua utilização é justificada por questões ambientais, a fim de reaproveitar estes resíduos sólidos urbanos, e por sua caraterística como barreira radiante na transmissão de calor. Porém, alguns estudos publicados analisaram apenas sua eficiência no isolamento térmico, sem considerar o comportamento do material em situações de incêndio. Sendo assim, o objetivo deste trabalho é apresentar a análise e classificação de reação ao fogo de embalagens cartonadas do tipo “longa vida”. Além do ensaio de não combustibilidade, foram realizados testes de ignitabilidade, painel radiante de parede, densidade ótica de fumaça e single burn item (SBI). Os resultados evidenciaram que o material é combustível, sendo classificado com classe de reação ao fogo VI, conforme critérios para materiais especiais. Sendo assim, com base nos resultados encontrados, pode-se indicar que as embalagens cartonadas não devem ser utilizadas como um produto para revestir o interior de edificações. longavida longa vida “longa-vida informalmente madeira ambientais urbanos calor Porém incêndio assim vida. . vida” combustibilidade ignitabilidade parede SBI. SBI (SBI) combustível VI especiais encontrados podese pode se (SBI

Abstract Cool materials have higher values of solar reflectance and lower values of thermal emittance, although still high when compared to conventional coatings, thus, their surfaces are less heated. In this regard, the goal was to identify the chemical elements present on cool surfaces that influence solar reflectance and thermal emittance. To this end, the spectral reflectance and the thermal emittance were measured with methods and equipment standardized by the Cool Roof Rating Council (CRRC) of 23 elastomeric cool coatings commercialized in the Brazilian market, and the chemical composition of the surfaces with EDS (Energy-dispersive X-ray detector) coupled to the field emission scanning electron microscope (FE-SEM) was analyzed. The presence of the metallic chemical element (titanium) in greater quantities on the surfaces was not decisive for lower thermal emittance values. The surfaces of materials with lower carbon and higher oxygen content have higher near infrared and solar reflectance. Therefore, surfaces with a matte finish have higher solar reflectance values because of the higher ratio of pigments in relation to resin than those with a glossy finish, which are mistakenly associated with higher reflectance due to its high surface gloss. thus heated regard end CRRC (CRRC 2 market Energydispersive Energy dispersive Xray X ray detector FESEM FE SEM (FE-SEM analyzed titanium (titanium Therefore gloss

Resumo Os materiais frios possuem maiores valores de refletância solar e menores, apesar de elevados, de emitância térmica comparados aos revestimentos convencionais, desta forma, aquecem menos suas superfícies. Assim, o objetivo foi identificar os elementos químicos presentes nas superfícies frias que influenciam na refletância solar e emitância térmica. Para isso, foram medidas a refletância espectral e a emitância térmica com métodos e equipamentos normatizados pelo Cool Roof Rating Council (CRRC) de 23 revestimentos frios elastoméricos do mercado brasileiro e analisada a composição química das superfícies com EDS (detector de energia dispersiva de raios-x) acoplado ao microscópio eletrônico de varredura por emissão de campo (SEM-FEG). A presença do elemento químico metálico (titânio) em maiores quantidades nas superfícies não foi determinante para menores valores de emitância térmica. As superfícies dos materiais com menor quantidade de carbono e maior em oxigênio possuem maior refletância no infravermelho próximo e solar. Portanto, superfícies com acabamento superficial fosco têm maiores valores de refletância solar por causa da maior proporção de pigmentos em relação à resina do que as de acabamento brilhante, que erroneamente são associadas com maior refletância por causa do alto brilho superficial. elevados convencionais forma Assim isso CRRC (CRRC 2 detector raiosx raios x raios-x SEMFEG. SEMFEG SEM FEG . (SEM-FEG) titânio (titânio Portanto brilhante (SEM-FEG

Resumen Introducción: La anestesia espinal se realiza mediante palpación de superficies para la identificación de los espacios intervertebrales lumbares. En adultos mayores el procedimiento presenta mayor dificultad debido a los cambios degenerativos de la columna vertebral asociados a la edad. Objetivo: Evaluar cuál técnica de anestesia espinal garantiza una mayor tasa de éxito entre la guiada por ultrasonido (US) y la guiada por reparos anatómicos (RA) en adultos mayores. Métodos: Estudio observacional de cohorte prospectivo en pacientes con indicación de suministro de anestesia subaracnoidea independientemente de la intervención quirúrgica, llevado a cabo en el Hospital Universitario del Valle y la Fundación Hospital San José Buga. En un lapso de 12 meses se recolectaron datos durante la realización de la punción, según decisión del anestesiólogo tratante, guiada por US vs. RA. Resultados: En total se evaluaron 80 pacientes entre hombres y mujeres, mayores de 65 años, con edad media de 78,50±9,04. El número de punciones, así como de redireccionamientos, fue significativamente menor en el grupo guiado por US. Adicionalmente, se observó que en el grupo guiado por RA, el 37,5 % no coincidía con el sitio demarcado con el espacio real de punción confirmado con US (p<0,001). Podría ser la causa de un bloqueo inadecuado o de complicaciones de la punción intradural. Conclusiones: La técnica de anestesia neuroaxial guiada por US en adultos mayores podría facilitar el bloqueo neuroaxial al primer intento de punción.

Abstract Introduction: Spinal anesthesia requires palpation of surfaces in order to identify the intervertebral spaces in the lumbar spine. In elderly individuals, the procedure is more challenging due to age-related degenerative changes in the spine. Objective: To determine which technique between ultrasound (US) guidance or the use of anatomical landmarks to guide spinal anesthesia ensures a higher success rate in elderly patients. Methods: prospective observational cohort study in patients with an indication to receive subarachnoid anesthesia, regardless of the type of surgical intervention, carried out at Hospital Universitario del Valle and Fundación Hospital San José Buga. Data were collected over a 12-month period at the time of making the puncture. The treating anesthetists were free to choose between US guidance or the use of anatomical landmarks. Results: Overall, 80 patients were assessed, including men and women over 65 years of age (mean 78.5±19.04). The number of punctures as well as needle redirections were significantly lower in the US-guided group. Additionally, in the group in which anatomical landmarks were used to guide the puncture, the marked site did not coincide with the actual puncture site confirmed with US in 37.5% of cases (p<0.001). This could result in inadequate block or complications associated with intradural puncture. Conclusions: US-guided neuroaxial anesthesia in elderly individuals could facilitate success on the first attempt.

Resumen Este estudio, se centra en la cobertura forestal de tres distritos en el ámbito urbano de la provincia de Andahuaylas, región Apurímac en Perú, la cual afronta problemas de deforestación. El objetivo fue determinar la cobertura forestal en el área urbana de la provincia de Andahuaylas hasta el 2030, para la revelación de los escenarios futuros de la cobertura forestal, contribuyendo al desarrollo de la planificación urbana y a la creación de ciudades sostenibles. Para el área de estudio, se utilizaron datos registrados entre los años 2017-2023, a partir de las imágenes NDVI del portal Sentinelhub. Permitiendo disponer de información de bosques tropicales y templados; arbustos y pastizales; zonas áridas de roca; áreas urbanas o artificiales que han cambiado como consecuencia del proceso de urbanización. Se determinaron las superficies de bosque en el área de estudio. Posteriormente se utilizó la regresión lineal con un p valor = 0,046, alcanzando un R2 de 0,583 en un rango medio, logrando estimar los escenarios futuros del bosque al 2030. Se concluye que la tendencia es decreciente en la cobertura forestal en 26,50% al año 2030.

Absttract This study focuses on the forest cover of three districts in the urban area of the province of Andahuaylas, Apurímac region, Peru, which is facing deforestation problems. The objective was to determine the forest cover in the urban area of the province of Andahuaylas until 2030, to reveal future scenarios of forest cover, contributing to the development of urban planning and the creation of sustainable cities. For the study area, data recorded between the years 2017-2023 were used, based on NDVI images from the Sentinelhub portal. This allowed for the availability of information on tropical and temperate forests, shrubs and grasslands, arid rock zones, and urban or artificial areas that have changed due to the urbanization process. The forest surfaces in the study area were determined. Subsequently, linear regression was used with a p-value = 0,046, reaching an R2 of 0,583 in a medium range, managing to estimate future forest scenarios by 2030. It is concluded that the trend is decreasing in forest cover by 26,50% by the year 2030.

Abstract PA is a gram-negative pathogen that is highly aggressive and known to cause several nosocomial infections, leading to significant morbidity and mortality levels. Individuals with compromised immunity are especially vulnerable to life-threatening infections caused by this bacterium. PA importance as a pathogen is further underscored by its virulence, increasing resistance to antibiotics, and its ability to adapt to diverse environmental conditions. In this study, MO extract antibacterial activity was evaluated using Ec methods, such as CV, EIS and polarization curves (Tafel’s law), against pathogenic bacteria, including PA. The performance of the developed CPE modified by MO was herein tested with C6H12O6, by CV technique. The CV recorded at the CPE-MO surface showed a well-defined peak, which was due to C₆H₁₂O₆ Ec oxidation. PA addition to the electrolyte solution containing C₆H₁₂O₆ caused its oxidation peak to disappear. The hypothesis that PA would adhere to the CPE-MO surface, blocking the active sites and, subsequently, C₆H₁₂O₆ oxidation, was proposed. To verify this hypothesis, polarization curves and EIS, which revealed the presence of a non-conductive film on the CPE-MO surface, were employed. The morphology of the elaborated electrodes surfaces was characterized by SEM.

Abstract This paper presents the results of the archaeological research carried out at the quarry- workshop of Arroyo La Saudade locality. This study was aimed at characterizing the available raw material and the recovered archaeological assemblages. This locality is in the southwestern sector of the Ventania hilly system, in the southeast of the province of Buenos Aires, Argentina. It is associated to an outcrop of the Brecha Cerro Colorado unit, formed by good quality quartzite pebbles. On these pebbles, evidence of knapping for the extraction of raw material were detected as well as a large amount of spatially associated lithic artifacts. Two grids were excavated, and surface collections were made. On the recovered lithic assemblage, macroscopic (to characterize its colour and fracture), microscopic (through petrographic microscope) and techno-morphological analysis were conducted. Quartzite from this locality is distinguished, under a microscope, by the presence of a variable, but generally very low, degree of metamorphism, good quality for knapping, and smooth, shiny fracture surfaces. The colours are presented in a limited range, with predominance of ochre and pink. Among the recovered artifacts are cores in different stages of reduction and preparation, tools, and flakes. Some implications of these findings are discussed.

Resumen En este trabajo se presentan los avances en las investigaciones desarrolladas en la localidad cantera-taller Arroyo La Saudade, las cuales estuvieron orientadas a caracterizar la materia prima disponible y los conjuntos arqueológicos recuperados. Dicha localidad se ubica en el sector suroccidental del sistema serrano de Ventania, en el sudoeste de la provincia de Buenos Aires, Argentina. Se encuentra asociada a un afloramiento de la unidad Brecha Cerro Colorado, conformado por rodados de cuarcita de buena calidad para la talla. Sobre estos rodados se identificaron evidencias de talla para la extracción de materia prima, así como una gran cantidad de artefactos líticos en las inmediaciones. Se excavaron dos cuadrículas y se realizaron recolecciones superficiales. Sobre los artefactos recuperados se desarrollaron análisis macroscópicos (a los fines de caracterizar su color y fractura), microscópicos (por medio de microscopio petrográfico) y tecno-morfológicos. Las cuarcitas de esta localidad se distinguen, bajo microscopio, por la presencia de rasgos que denotan un grado variable de metamorfismo, pero generalmente muy bajo, una buena calidad para la talla y superficies de fractura lisas y brillantes. Se presentan en una gama acotada de colores, con predominio de los ocres y rosados. Entre los artefactos recuperados se encuentran núcleos con diferente grado de reducción y preparación, instrumentos y productos de talla. Se discuten algunas implicancias de estos hallazgos.

Abstract The present work focuses on the numerical study of the flow within a junction formed by the intersection of two millimeter channels. In particular, we study the dynamics of two identical fluids injected from opposite inlets at the contact region and at the exit channels. We analyse the effect of the cross-section on two aspects of the flow dynamics. First, its influence on the liquid fraction at the outlet channels. Second, its effect on the morphology of the stream surfaces.

Resumen El presente trabajo se enfoca en el estudio numérico del flujo dentro de una juntura formada por la intersección de dos canales milimétricos. En particular, se caracteriza la dinámica de dos fluidos idénticos inyectados desde entradas opuestas tanto en la región de contacto como en los conductos de salida. Se analiza el efecto de la forma de la sección transversal sobre dos aspectos del flujo. Primero, en la proporción de cada uno de los líquidos en los canales de salida. Segundo, en la morfología de las superficies de corriente.

Resumen La placa dental se forma a partir de una película adquirida como resultado de la alimentación que se deposita sobre las superficies dentales, por lo que un buen cepillado dental ayuda a mitigar los problemas a futuro que podría causar. Investigación de revisión sistemática, cuyo objetivo fue analizar la importancia del cepillado dental y comparar las características de un cepillado adecuado en la reducción de placa bacteriana en escolares. Se utilizó la metodología PRISMA; se revisaron bases de datos PubMed, SciELO, Scopus y Google Scholar; inicialmente Se trabajó con 1597 artículos, tan solo 18 cumplieron con el rigor científico. Concluyéndose que: los cepillos eléctricos, la técnica de Bass modificada y un adecuado cepillado debe incluir tiempo de uso, frecuencia y supervisión en caso de los niños.

Abstract Dental plaque is formed from a film acquired as a result of food that is deposited on dental surfaces, so good tooth brushing helps to mitigate the future problems that it could cause. The objective of this systematic review was to analyze the importance of tooth brushing and to compare the characteristics of adequate brushing in the reduction of bacterial plaque in school children. The PRISMA methodology was used; databases PubMed, SciELO, Scopus and Google Scholar were reviewed; initially 1597 articles were worked with, only 18 complied with the scientific rigor. It was concluded that: electric toothbrushes, the modified Bass technique and adequate brushing should include time of use, frequency and supervision in the case of children.