Efficient bioremediation of indigo-dye contaminated textile wastewater using native microorganisms and combined bioaugmentation-biostimulation techniques.

In this work, the bioremediation of wastewater from the textile industry with indigo dye content was carried out using combined bioaugmentation, bioventilation, and biostimulation techniques. Initially, the inoculum was prepared by isolating the microorganisms from the textile wastewater in a 2 L bioreactor. Then, the respirometry technique was implemented to determine the affinity of the microorganisms and the substrate by measuring CO2 and allowed the formulation of an empirical mathematical model for the growth kinetics of the microorganism. Finally, the bioremediation was carried out in a 3 L bioreactor obtaining an indigo dye removal efficiency of 20.7 ± 1.2%, 24.0 ± 1.5%, and 29.7 ± 1.1% for equivalent wavelengths of 436 nm, 525 nm, and 620 nm. The chemical oxygen demand showed an average reduction of 88.9 ± 2.5%, going from 470.7 ± 15.6 to 52.3 ± 10.7 ppm after 30 days under constant agitation and aeration. A negative generalized exponential model was fitted to assess the affinity of the microorganism with the wastewater as a substrate by evaluating the production of CO2 during the bioremediation. Bioremediation techniques improve water discharge parameters compared to chemical treatments implemented in the industry, reducing the use of substances that can generate secondary pollution. Bioaugmentation, biostimulation, and bioventing of the textile wastewater in this study demonstrate the potential of these combined techniques to serve as an efficient alternative for indigo-contaminated wastewater in the textile industry.

Advancements in Nanoparticle Deposition Techniques for Diverse Substrates: A Review.

Nanoparticle deposition on various substrates has gained significant attention due to the potential applications of nanoparticles in various fields. This review paper comprehensively analyzes different nanoparticle deposition techniques on ceramic, polymeric, and metallic substrates. The deposition techniques covered include electron gun evaporation, physical vapor deposition, plasma enriched chemical vapor deposition (PECVD), electrochemical deposition, chemical vapor deposition, electrophoretic deposition, laser metal deposition, and atomic layer deposition (ALD), thermophoretic deposition, supercritical deposition, spin coating, and dip coating. Additionally, the sustainability aspects of these deposition techniques are discussed, along with their potential applications in anti-icing, antibacterial power, and filtration systems. Finally, the review explores the importance of deposition purities in achieving optimal nanomaterial performance. This comprehensive review aims to provide valuable insights into state-of-the-art techniques and applications in the field of nanomaterial deposition.

Exploring the Potential of Fique Fiber as a Natural Composite Material: A Comprehensive Characterization Study.

Many studies available in the literature focus mainly on the mechanical characterization of fiber, leaving out other physicochemical and thermogravimetric analyses that allow for establishing its potential as an engineering material. This study characterizes fique fiber for its potential use as an engineering material. The fiber's chemical composition and physical, thermal, mechanical, and textile properties were analyzed. The fiber has a high holocellulose content and low lignin and pectin content, indicating its potential as a natural composite material for various applications. Infrared spectrum analysis revealed characteristic bands associated with multiple functional groups. The fiber had monofilaments with diameters around 10 µm and 200 µm, as determined by AFM and SEM images, respectively. Mechanical testing showed the fiber could resist a maximum stress of 355.07 MPa, with an average maximum strain at which breakage occurs of 8.7%. The textile characterization revealed a linear density range of 16.34 to 38.83 tex, with an average value of 25.54 tex and a regain of 13.67%. Thermal analysis showed that the fiber's weight decreased by around 5% due to moisture removal in the range of 40 °C to 100 °C, followed by weight loss due to thermal degradation of hemicellulose and glycosidic linkages of cellulose ranging from 250 to 320 °C. These characteristics suggest that fique fiber can be used in industries such as packaging, construction, composites, and automotive, among others.

From E-Waste to High-Value Materials: Sustainable Synthesis of Metal, Metal Oxide, and MOF Nanoparticles from Waste Printed Circuit Boards.

The exponential growth of electronic waste (e-waste) has raised significant environmental concerns, with projections indicating a surge to 74.7 million metric tons of e-waste generated by 2030. Waste printed circuit boards (WPCBs), constituting approximately 10% of all e-waste, are particularly intriguing due to their high content of valuable metals and rare earth elements. However, the presence of hazardous elements necessitates sustainable recycling strategies. This review explores innovative approaches to sustainable metal nanoparticle synthesis from WPCBs. Efficient metal recovery from WPCBs begins with disassembly and the utilization of advanced equipment for optimal separation. Various pretreatment techniques, including selective leaching and magnetic separation, enhance metal recovery efficiency. Green recovery systems such as biohydrometallurgy offer eco-friendly alternatives, with high selectivity. Converting metal ions into nanoparticles involves concentration and transformation methods like chemical precipitation, electrowinning, and dialysis. These methods are vital for transforming recovered metal ions into valuable nanoparticles, promoting sustainable resource utilization and eco-friendly e-waste recycling. Sustainable green synthesis methods utilizing natural sources, including microorganisms and plants, are discussed, with a focus on their applications in producing well-defined nanoparticles. Nanoparticles derived from WPCBs find valuable applications in drug delivery, microelectronics, antimicrobial materials, environmental remediation, diagnostics, catalysis, agriculture, etc. They contribute to eco-friendly wastewater treatment, photocatalysis, protective coatings, and biomedicine. The important implications of this review lie in its identification of sustainable metal nanoparticle synthesis from WPCBs as a pivotal solution to e-waste environmental concerns, paving the way for eco-friendly recycling practices and the supply of valuable materials for diverse industrial applications.

Biosynthesized Silica Nanosuspension as Thermal Fluid in Parabolic Solar Panels.

In this work, the production of biologically synthesized silica nanoparticles was proposed to prepare a nanosuspension as a thermal fluid in parabolic solar panels at the laboratory level. Silica nanoparticles were produced from construction sand in two stages. Biosynthesis broth was produced by Aspergillus niger aerated fermentation in a 1 L bioreactor for 9 days. Each supernatant was contacted with 18% construction sand in a 500 L reactor with mechanical agitation, at a temperature of 25 °C, and a contact time of 30 min. Subsequently, the separation process was carried out. For day 9, a pH value of 1.71 was obtained as well as acid concentrations of 15.78 g/L for citrus and 4.16 g/L for malic. The metal extraction efficiency of Si nanoparticles was 19%. The vibration peaks in the FTIR were characteristic of the presence of silica nanoparticles in wavenumbers 1020 cm-1 and 1150 cm-1. Finally, a prototype solar radiation test bench for parabolic systems was built and provided with a radiation source that falls on a translucent pipe that transports the nanoparticles, which has a pump and a series of thermocouples. The heat capacity of the biotechnologically produced silica nanoparticle suspension was 0.72 ± 0.05 kJ/kgK, using material and energy balances in the flow circuit.

Potential of residual fungal biomass: a review.

In this study, it was evaluated and documented the potential uses of the residual fungal biomass from fermentation. The chemical composition of the biomass was determined by instrumental analysis techniques for its characterization and its possible application. It was found that this biomaterial is generally composed of sugars, proteins, and lipids, which provide it certain properties and applications that must be characterized morphologically, chemically, and mechanically. The residual fungal biomass could be used for two processes: the extraction of biopolymers, with several applications in the food industry, cosmetics, and pharmaceutical, among others; and the removal of contaminants by mechanisms of adsorption with biopolymers, known also as biosorption, in tertiary treatments of wastewater.

Experiencia en el uso de R para el ajuste de curvas de crecimiento / Using R for adjusting growths curves

La construcción de curvas de crecimiento para dimensiones antropométricas es un proceso engorroso que hasta ahora, en el país, se ha realizado manualmente. Con el objetivo de automatizar este proceso se realizó una actualización del estado del arte de métodos para ajuste de curvas de crecimiento basados en programas de computación. Se presenta una experiencia realizada con datos de circunferencia de cintura de varones entre 8 y 19 años de edad, residentes en Ciudad de La Habana en el año 1998, donde se aplicaron los métodos adoptados por la Organización Mundial de la Salud (OMS) para la elaboración de patrones internacionales de crecimiento. El soporte computacional de dichos métodos se basa en el paquete GAMLSS del proyecto R, software de código abierto y completamente libre(AU)

Child growth curves construction is a tiresome and time consuming process that has been done manually till now in our country. A review of methods for adjusting growth curve was carried out in order to automate this process. Techniques and procedures adopted by the World Health Organization (WHO) for the construction of child growth standards were applied to adjust waist circumference curve for boys from 8 to 19 years old. The methods recommended by WHO rest in the use of the computational package GAMLSS, which was developed in R, free and open source software for statistical computing(AU)

Experiencias de la aplicación de la ingeniería de software en sistemas de gestión / Experiences about the aplication software engeniering in management systems

Constituye un objetivo fundamental de los diseñadores de software alcanzar y mantener un nivel técnico acorde con el desarrollo actual en la automatización de la información para la gestión y la dirección, y se argumenta la importancia de la Ingeniería de Software para elevar la productividad y la calidad en diseños de sistemas automatizados a partir de un examen detallado de las metodologías existentes. En correspondencia con los Lineamientos para la Informatización de la Sociedad Cubana, se realizó un estudio sobre la evolución de la automatización de la gestión en el Instituto Superior de Ciencias Médicas de La Habana (ISCM-H), y sobre los criterios del software de gestión de la salud elaborados para ese propósito. Se demuestra la necesidad de utilizar metodologías adecuadas para diseñar sistemas con mayor productividad y mejor calidad, y de transmitir los conocimientos de Ingeniería de Software a los profesionales de la salud vinculados con la computación, especialmente a los diseñadores de sistemas que laboran en este sector. Sobre la base de estos criterios se confeccionó y rediseñó el software existente para la gestión en los Centros de Educación Médica Superior (CEMS) y el Ministerio de Salud Pública (MINSAP). Por último se proponen criterios para evaluar la calidad del software que se confeccione(AU)

Cáncer de cuello uterino y embarazo en el Hospital Universitario "Dr. Angel Larralde" en el quinquenio 1982-1986 / Carcinoma of the cervix and pregnancy at the Hospital Universitario \"Dr. Angel Larralde\" years 1982-1986

La prevalencia de lesiones neoplásicas intraepiteliales en embarazadas estudiadas en el Hospital Universitario "Angel Larralde entre 1982 y 1986 fue de 0.58%, encontrándose dentro del rango reportado por diferentes autores en estudios similares. La mayor prevalencia de la patología estudiada se encuentra dentro del grupo de pacientes; comprendidas entre 35 y 39 años. Un 75% de las lesiones diagnósticadas se presentaron en un grupo de embarazadas que refieren entre tres y siete gestaciones. Las lesiones intraepiteliales, incluído el cáncer in situ deben ser tratadas conservadoramente durante el embarazo, reservando los procedimientos convencionales (crioterapia, láser, etc...) para el postparto