Condiciones Laborales y de Salud de Los Trabajadores de la Maquila del Tabaco. Ciudad El Paraíso, Honduras. Octubre 2003 a Marzo 2004.

El propósito es describir las características socio demográficas, las condiciones de trabajo y situación de salud de los trabajadores para aportar información y conocer la magnitud y trascendencia de esta problemática y tomar decisiones necesarias de prevención

Physicochemical Modeling for Hot Water Extraction of Birch Wood

This paper presents a model developed for hot water extraction of birch wood meal. Besides solids, two liquid phases are assumed in the system: liquid bound to a wood fiber wall and the other remaining external liquid. True chemical species, their reactions, and diffusion between the liquid phases are considered in the model. The breakdown of hemicellulose into short-chain polymers and monomeric sugar units is modeled by applying an accurate and computationally efficient population balance approach. State-of-the-art correlations and equations are used, thus aiming for a truly predictive model. Several thermodynamic and kinetic submodels are integrated to achieve additional information compared to models already presented in the literature. The presented model is capable of reproducing the measured concentration profiles of chemical species and molecular weight distribution of hemicellulose polymers as a function of the process conditions. The output concentration data are further utilized to calculate the dissolved species and pH in the two liquid phases. Eventually, it could be utilized in optimizing a batch hot water extraction process to maximize either the yield of long-chain hemicelluloses or their monomeric sugars

Photoluminescent 3D Lanthanide–Organic Frameworks Based on 2,5-Dioxo-1,4-piperazinylbis(methylphosphonic) Acid Formed via in Situ Cyclodehydration of Glyphosates

Hydrothermal reactions of lanthanide nitrates with glyphosate have resulted three new isostructural 3D lanthanide–organic frameworks, Ln­(NO₃)­(H₂L) [Ln = Eu (<b>1</b>), Tb (<b>2</b>), Gd (<b>3</b>); H₄L = 2,5-dioxo-1,4-piperazinylbis­(methylphosphonic) acid], with good yields, where H₄L as a new ligand was formed via in situ cyclodehydration of original ligand glyphosates during the hydrothermal reaction. The compounds were thoroughly characterized by IR, UV–vis, elemental analysis, single-crystal X-ray diffraction analysis, powder X-ray diffraction analysis, and thermogravimetric/differential thermal analysis (TG-DTA). Three compounds display 3D 6,6-connected open frameworks with 4¹³·6² topology possessing 1D channels in which NO₃^– anions act as troglodytes by chelating Ln³⁺ centers. The TG-DTA study of the compounds showed remarkable thermal stability up to 380 °C. Under room temperature UV-light irradiation, the Eu³⁺ and Tb³⁺ compounds showed the corresponding characteristic Ln³⁺ intra 4f^<i>n</i> emission peaks. The triplet energy level (21882 cm^–1) of the ligand (H₄L) was determined from the emission spectrum of its Gd³⁺ compound at 77 K. The emission lifetimes (1.54 ms of ⁵D₀ for compound <b>1</b> and 1.98 ms of ⁵D₄ for compound <b>2</b>) and absolute emission quantum yields (10.1% for compound <b>1</b> and 5.9% for compound <b>2</b>) were also determined

Photoluminescent 3D Lanthanide–Organic Frameworks Based on 2,5-Dioxo-1,4-piperazinylbis(methylphosphonic) Acid Formed via in Situ Cyclodehydration of Glyphosates

Hydrothermal reactions of lanthanide nitrates with glyphosate have resulted three new isostructural 3D lanthanide–organic frameworks, Ln­(NO₃)­(H₂L) [Ln = Eu (<b>1</b>), Tb (<b>2</b>), Gd (<b>3</b>); H₄L = 2,5-dioxo-1,4-piperazinylbis­(methylphosphonic) acid], with good yields, where H₄L as a new ligand was formed via in situ cyclodehydration of original ligand glyphosates during the hydrothermal reaction. The compounds were thoroughly characterized by IR, UV–vis, elemental analysis, single-crystal X-ray diffraction analysis, powder X-ray diffraction analysis, and thermogravimetric/differential thermal analysis (TG-DTA). Three compounds display 3D 6,6-connected open frameworks with 4¹³·6² topology possessing 1D channels in which NO₃^– anions act as troglodytes by chelating Ln³⁺ centers. The TG-DTA study of the compounds showed remarkable thermal stability up to 380 °C. Under room temperature UV-light irradiation, the Eu³⁺ and Tb³⁺ compounds showed the corresponding characteristic Ln³⁺ intra 4f^<i>n</i> emission peaks. The triplet energy level (21882 cm^–1) of the ligand (H₄L) was determined from the emission spectrum of its Gd³⁺ compound at 77 K. The emission lifetimes (1.54 ms of ⁵D₀ for compound <b>1</b> and 1.98 ms of ⁵D₄ for compound <b>2</b>) and absolute emission quantum yields (10.1% for compound <b>1</b> and 5.9% for compound <b>2</b>) were also determined

Photoluminescent 3D Lanthanide–Organic Frameworks Based on 2,5-Dioxo-1,4-piperazinylbis(methylphosphonic) Acid Formed via in Situ Cyclodehydration of Glyphosates

Hydrothermal reactions of lanthanide nitrates with glyphosate have resulted three new isostructural 3D lanthanide–organic frameworks, Ln­(NO₃)­(H₂L) [Ln = Eu (<b>1</b>), Tb (<b>2</b>), Gd (<b>3</b>); H₄L = 2,5-dioxo-1,4-piperazinylbis­(methylphosphonic) acid], with good yields, where H₄L as a new ligand was formed via in situ cyclodehydration of original ligand glyphosates during the hydrothermal reaction. The compounds were thoroughly characterized by IR, UV–vis, elemental analysis, single-crystal X-ray diffraction analysis, powder X-ray diffraction analysis, and thermogravimetric/differential thermal analysis (TG-DTA). Three compounds display 3D 6,6-connected open frameworks with 4¹³·6² topology possessing 1D channels in which NO₃^– anions act as troglodytes by chelating Ln³⁺ centers. The TG-DTA study of the compounds showed remarkable thermal stability up to 380 °C. Under room temperature UV-light irradiation, the Eu³⁺ and Tb³⁺ compounds showed the corresponding characteristic Ln³⁺ intra 4f^<i>n</i> emission peaks. The triplet energy level (21882 cm^–1) of the ligand (H₄L) was determined from the emission spectrum of its Gd³⁺ compound at 77 K. The emission lifetimes (1.54 ms of ⁵D₀ for compound <b>1</b> and 1.98 ms of ⁵D₄ for compound <b>2</b>) and absolute emission quantum yields (10.1% for compound <b>1</b> and 5.9% for compound <b>2</b>) were also determined

Photoluminescent 3D Lanthanide–Organic Frameworks Based on 2,5-Dioxo-1,4-piperazinylbis(methylphosphonic) Acid Formed via in Situ Cyclodehydration of Glyphosates

Hydrothermal reactions of lanthanide nitrates with glyphosate have resulted three new isostructural 3D lanthanide–organic frameworks, Ln­(NO₃)­(H₂L) [Ln = Eu (<b>1</b>), Tb (<b>2</b>), Gd (<b>3</b>); H₄L = 2,5-dioxo-1,4-piperazinylbis­(methylphosphonic) acid], with good yields, where H₄L as a new ligand was formed via in situ cyclodehydration of original ligand glyphosates during the hydrothermal reaction. The compounds were thoroughly characterized by IR, UV–vis, elemental analysis, single-crystal X-ray diffraction analysis, powder X-ray diffraction analysis, and thermogravimetric/differential thermal analysis (TG-DTA). Three compounds display 3D 6,6-connected open frameworks with 4¹³·6² topology possessing 1D channels in which NO₃^– anions act as troglodytes by chelating Ln³⁺ centers. The TG-DTA study of the compounds showed remarkable thermal stability up to 380 °C. Under room temperature UV-light irradiation, the Eu³⁺ and Tb³⁺ compounds showed the corresponding characteristic Ln³⁺ intra 4f^<i>n</i> emission peaks. The triplet energy level (21882 cm^–1) of the ligand (H₄L) was determined from the emission spectrum of its Gd³⁺ compound at 77 K. The emission lifetimes (1.54 ms of ⁵D₀ for compound <b>1</b> and 1.98 ms of ⁵D₄ for compound <b>2</b>) and absolute emission quantum yields (10.1% for compound <b>1</b> and 5.9% for compound <b>2</b>) were also determined

Additional file 1: Table S1. of Chemical profiling, antimicrobial and insecticidal evaluations of Polygonum hydropiper L

Result of GC, GC-MS analysis for the identification of compounds in Ph.Cr of P.hydropiper. (DOCX 25 kb

Additional file 1: Table S1. of Comparative chemical profiling, cholinesterase inhibitions and anti-radicals properties of essential oils from Polygonum hydropiper L: A Preliminary anti- Alzheimer’s study

Details of compounds identified in GC, GC-MS analysis of essential oils from leaves of Polygonum hydropiper. (DOCX 29 kb

Image_1_Exploring the potential of halotolerant bacteria from coastal regions to mitigate salinity stress in wheat: physiological, molecular, and biochemical insights.tiff

Salinity stress, a significant global abiotic stress, is caused by various factors such as irrigation with saline water, fertilizer overuse, and drought conditions, resulting in reduced agricultural production and sustainability. In this study, we investigated the use of halotolerant bacteria from coastal regions characterized by high salinity as a solution to address the major environmental challenge of salinity stress. To identify effective microbial strains, we isolated and characterized 81 halophilic bacteria from various sources, such as plants, rhizosphere, algae, lichen, sea sediments, and sea water. We screened these bacterial strains for their plant growth-promoting activities, such as indole acetic acid (IAA), phosphate solubilization, and siderophore production. Similarly, the evaluation of bacterial isolates through bioassay revealed that approximately 22% of the endophytic isolates and 14% of rhizospheric isolates exhibited a favorable influence on seed germination and seedling growth. Among the tested isolates, GREB3, GRRB3, and SPSB2 displayed a significant improvement in all growth parameters compared to the control. As a result, these three isolates were utilized to evaluate their efficacy in alleviating the negative impacts of salt stress (150 mM, 300 mM, and seawater (SW)) on the growth of wheat plants. The result showed that shoot length significantly increased in plants inoculated with bacterial isolates up to 15% (GREB3), 16% (GRRB3), and 24% (SPSB2), respectively, compared to the control. The SPSB2 strain was particularly effective in promoting plant growth and alleviating salt stress. All the isolates exhibited a more promotory effect on root length than shoot length. Under salt stress conditions, the GRRB3 strain significantly impacted root length, leading to a boost of up to 6%, 5%, and 3.8% at 150 mM, 300 mM, and seawater stress levels, respectively. The bacterial isolates also positively impacted the plant’s secondary metabolites and antioxidant enzymes. The study also identified the WDREB2 gene as highly upregulated under salt stress, whereas DREB6 was downregulated. These findings demonstrate the potential of beneficial microbes as a sustainable approach to mitigate salinity stress in agriculture.</p