Identification of individual and few layers of WS2 using Raman Spectroscopy

"The Raman scattering of single-and few-layered WS2 is studied as a function of the number of S-W-S layers and the excitation wavelength in the visible range (488, 514 and 647 nm). For the three excitation wavelengths used in this study, the frequency of the A(1g)(C) phonon mode monotonically decreases with the number of layers. For single-layer WS2, the 514.5 nm laser excitation generates a second-order Raman resonance involving the longitudinal acoustic mode (LA(M)). This resonance results from a coupling between the electronic band structure and lattice vibrations. First-principles calculations were used to determine the electronic and phonon band structures of single-layer and bulk WS2. The reduced intensity of the 2LA mode was then computed, as a function of the laser wavelength, from the fourth-order Fermi golden rule. Our observations establish an unambiguous and nondestructive Raman fingerprint for identifying single-and few-layered WS2 films.

Efecto del Proceso de Atención de Enfermería en un paciente crítico con Colangitis III

Introducción. La Colangitis Aguda Severa (CAS) o Colangitis III, se caracteriza por la obstrucción biliar total e infección de la bilis que puede evolucionar a una falla orgánica por infección sistémica, shock o muerte, su letalidad se incrementa en el retraso del tratamiento médico y su principal causa es por coledocolitiasis (1) Objetivo. Describir el efecto del Proceso de Atención de Enfermería (PAE) en un paciente en estado crítico con el diagnóstico médico de colangitis III. Materiales y métodos. Diseño cuantitativo, cuasi experimental, de corte transversal y se realizó una revisión bibliográfica en diversas plataformas como, Google Académico, PubMed y Elsevier así mismo, la organización de los datos se realizó con base a los patrones funcionales de salud, la redacción de diagnóstico se realizó con la taxonomía NANDA, los planes de cuidados con NOC y NIC. Resultados. El efecto de las intervenciones en los diagnósticos de mayor prioridad fue: limpieza ineficaz de las vías aéreas pre y postintervención 15-20, disminución del gasto cardiaco pre y postintervención 19-23 e hipertermia pre y postintervención 5-8. Conclusión. El efecto de las intervenciones de enfermería mediante la metodología del PAE asegura la calidad de la atención, y también nos permiten medir las respuestas humanas que indican una mejora del paciente, ayudando a identificar las áreas de oportunidad del cuidado

Antibacterial and Antiparasitic Activity of Propyl-Propane- Thiosulfinate (PTS) and Propyl-Propane-Thiosulfonate (PTSO) from Allium cepa against Gilthead Sea Bream Pathogens in In Vitro and In Vivo Studies

The use of phytogenic extracts is considered a sustainable strategy for the prevention of fish diseases, including Alliaceae as a potential option due to their variety of bioactive compounds. In this study, we analyzed the antibacterial and antiparasitic potential of propyl-propanethiosulfinate (PTS) and propyl-propane-thiosulfonate (PTSO) from onions. The in vitro activity against Pseudomonas anguilliseptica, Tenacibaculum maritimum, and Photobacterium damselae of both compounds was tested. In addition, the viability of Sparicotyle chrysophrii larvae was evaluated. Moreover, a diet that consisted of a blend of PTS/PTSO (ALLIUM) was used. A total of 90 gilthead sea bream juveniles were tested against P. damselae subsp. Piscicida after 12 weeks of dietary administration. Furthermore, 150 fish with a rate of 10–15 parasites/fish were fed for 21 days and the number of gill parasites was recorded. All strains were sensitive to both compounds. PTSO showed the highest inhibitory effect against all target strains, while PTS showed higher effectiveness against S. chrysophrii. Fish from ALLIUM group presented the highest probability of survival, increasing up to 91.1%, whereas in the control group, the probability of survival was 66.7%. The number of parasites in the gilthead sea bream decreased in the ALLIUM group over time. These results suggest the inclusion of PTS and PTSO in feed as a natural strategy to prevent antibacterial and antiparasitic fish diseases.Centre for the Development of Industrial Technology (CDTI) 20170032 CER-2021101

Metabolic crosstalk between hydroxylated monoterpenes and salicylic acid in tomato defense response against bacteria

[EN] Hydroxylated monoterpenes (HMTPs) are differentially emitted by tomato (Solanum lycopersicum) plants resisting bacterial infection. We have studied the defensive role of these volatiles in the tomato response to bacteria, whose main entrance is through stomatal apertures. Treatments with some HMTPs resulted in stomatal closure and pathogenesis-related protein 1 (PR1) induction. Particularly, alpha-terpineol induced stomatal closure in a salicylic acid (SA) and abscisic acid-independent manner and conferred resistance to bacteria. Interestingly, transgenic tomato plants overexpressing or silencing the monoterpene synthase MTS1, which displayed alterations in the emission of HMTPs, exhibited changes in the stomatal aperture but not in plant resistance. Measures of both 2-C-methyl-D-erythritol-2,4-cyclopyrophosphate (MEcPP) and SA levels revealed competition for MEcPP by the methylerythritol phosphate (MEP) pathway and SA biosynthesis activation, thus explaining the absence of resistance in transgenic plants. These results were confirmed by chemical inhibition of the MEP pathway, which alters MEcPP levels. Treatments with benzothiadiazole (BTH), a SA functional analog, conferred enhanced resistance to transgenic tomato plants overexpressing MTS1. Additionally, these MTS1 overexpressors induced PR1 gene expression and stomatal closure in neighboring plants. Our results confirm the role of HMTPs in both intra- and interplant immune signaling and reveal a metabolic crosstalk between the MEP and SA pathways in tomato plants.; Hydroxylated monoterpenes play an important role in both intra- and interplant immune signaling in tomato against bacterial infection.This work was supported by grant PID2020-116765RB-I00 funded by MCIN/AEI/10.13039/501100011033/ and grant PROMETEU/2021/056 by Generalitat Valenciana. C.P. was a recipient of a predoctoral contract of the Generalitat Valenciana (ACIF/2019/187), and J.P.-P. is a recipient of a JAEINT_21_02081 of the Consejo Superior de Investigaciones Cientificas and a predoctoral contract of the Ministerio de Universidades (FPU21/00259).Pérez, J.; Minguillón, S.; Kabbas-Piñango, E.; Payá, C.; Campos, L.; Rodriguez-Concepcion, M.; Espinosa-Ruiz, A.... (2024). Metabolic crosstalk between hydroxylated monoterpenes and salicylic acid in tomato defense response against bacteria. Plant Physiology. 195(3):2323-2338. https://doi.org/10.1093/plphys/kiae14823232338195

Prevalence and geographical distribution of bovine sexually transmitted diseases in the province of Formosa, Argentina

La campilobacteriosis genital bovina (CGB) y la tricomonosis bovina (TB) son enfermedades de transmisión sexual (ETS) que afectan a los rodeos de cría bovina y disminuyen su eficiencia reproductiva. El objetivo de este trabajo fue estimar la prevalencia de estas enfermedades y su distribución témporo-espacial en la provincia de Formosa, Argentina. El estudio fue transversal, se desarrolló durante 2018-2021 e incluyó 15.571 toros. Se encontró una prevalencia de CGB y TB inter-rodeo de 29,62 y 17,23%, respectivamente. La prevalencia de animales positivos fue de 2,05% para CGB y de 0,43% para TB. El análisis témporo-espacial de la CGB mostró dos agrupaciones espaciales, una de bajo riesgo (RR = 0,13; p < 0,001; 2018-2021) y otra de alto riesgo (RR = 2,84; p < 0,001; 2020-2021) de contraer la enfermedad. La TB presentó una agrupación de alto riesgo de contraer la enfermedad (RR = 35,24; p < 0,001; 2019). Este estudio muestra que las ETS son endémicas en la región y aporta información actualizada y de interés como herramienta para el manejo sanitario.Bovine genital campylobacteriosis (BGC) and bovine trichomonosis (BT) are sexually transmitted diseases (STDs) that affect bovine breeding herds, decreasing their reproductive efficiency. The objective of this work was to estimate the prevalence of these diseases and their temporal-spatial distribution in the province of Formosa, Argentina. The cross-sectional study conducted between 2018 and 2021 included a total of 15,571 bulls, inter-herd prevalence being 29.62% and 17.23% for BGC and BT, respectively. The prevalence of positive animals was 2.05% for BGC and 0.43% for BT. The temporal-spatial analysis of BGC showed two distinct spatial groupings, one group had a low risk of contracting the disease (RR = 0.13; p < 0.001; 2018–2021) while the other group had a high risk (RR = 2.84; p < 0.001; 2020–2021). BT had a high-risk group for the disease (RR = 35.24; p < 0.001; 2019). This study shows that STDs are endemic in the region, providing updated and valuable information as a tool for the health management of these diseases.Fil: Viola, María Nair. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro de Investigaciones y Transferencia de Formosa. Provincia de Formosa. Centro de Investigaciones y Transferencia de Formosa. Universidad Nacional de Formosa. Centro de Investigaciones y Transferencia de Formosa; ArgentinaFil: Elías, Iris Carolina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro de Investigaciones y Transferencia de Formosa. Provincia de Formosa. Centro de Investigaciones y Transferencia de Formosa. Universidad Nacional de Formosa. Centro de Investigaciones y Transferencia de Formosa; ArgentinaFil: Signorini Porchietto, Marcelo Lisandro. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Santa Fe. Estación Experimental Agropecuaria Rafaela; ArgentinaFil: Molineri, Ana Inés. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Santa Fe. Estación Experimental Agropecuaria Rafaela; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Russo, Ana Maria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro de Investigaciones y Transferencia de Formosa. Provincia de Formosa. Centro de Investigaciones y Transferencia de Formosa. Universidad Nacional de Formosa. Centro de Investigaciones y Transferencia de Formosa; ArgentinaFil: Zimmer, Patricia Andrea. Instituto Nacional de Tecnologia Agropecuaria. Centro Regional Chaco-formosa. Estacion Experimental Agropecuaria El Colorado. Agencia de Extension Rural Formosa.; ArgentinaFil: Lozina, Laura Analía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro de Investigaciones y Transferencia de Formosa. Provincia de Formosa. Centro de Investigaciones y Transferencia de Formosa. Universidad Nacional de Formosa. Centro de Investigaciones y Transferencia de Formosa; ArgentinaFil: Giménez, Juana Noemí. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro de Investigaciones y Transferencia de Formosa. Provincia de Formosa. Centro de Investigaciones y Transferencia de Formosa. Universidad Nacional de Formosa. Centro de Investigaciones y Transferencia de Formosa; Argentin

DNA sequence-specific recognition by a transcriptional regulator requires indirect readout of A-tracts

The bacteriophage Ø29 transcriptional regulator p4 binds to promoters of different intrinsic activities. The p4–DNA complex contains two identical protomers that make similar interactions with the target sequence 5′-AACTTTTT-15 bp-AAAATGTT-3′. To define how the various elements in the target sequence contribute to p4's affinity, we studied p4 binding to a series of mutated binding sites. The binding specificity depends critically on base pairs of the target sequence through both direct as well as indirect readout. There is only one specific contact between a base and an amino acid residue; other contacts take place with the phosphate backbone. Alteration of direct amino acid–base contacts, or mutation of non-contacted A·T base pairs at A-tracts abolished binding. We generated three 5 ns molecular dynamics (MD) simulations to investigate the basis for the p4–DNA complex specificity. Recognition is controlled by the protein and depends on DNA dynamic properties. MD results on protein–DNA contacts and the divergence of p4 affinity to modified binding sites reveal an inherent asymmetry, which is required for p4-specific binding and may be crucial for transcription regulation