Chiral Single-Molecule Potentiometers Based on Stapled ortho- Oligo(phenylene)ethynylenes.

We report on the chemical design of chiral molecular junctions with stress-dependent conductance, whose helicity is maintained during the stretching of a single molecule junction due to the stapling of both ends of the inner helix. In the reported compounds, different conductive pathways are observed, with clearly different conductance values and plateau-length distributions, attributed to different conformations of the helical structures. The large chiro-optical responses and the potential use of these molecules as unimolecular spin filters have been theoretically proved using state-of-the-art Density Functional Theory (DFT) calculations, including a fully ab-initio estimation of the CISS-originating spin polarization which is done, for the first time, for a realistic molecular system.

Prevalence of premature loss of deciduous teeth and its relationship with gender among children from Acapulco, Guerrero: a cross-sectional study.

BACKGROUND: Premature loss of deciduous teeth is the exfoliation or extraction before physiological replacement with < 50% or < 75% of the root of the substitute tooth formed or if there is > 1 mm of alveolar bone covering the permanent successor tooth organ. This study aimed to estimate the prevalence of premature tooth loss in children and identify associated factors in a health center in Acapulco, Guerrero. METHODS: We conducted a cross-sectional study in which we collected information from 109 clinical records of children examined from January 2019 to August 2021. Sociodemographic data of the children and parents were collected: socioeconomic level, non-pathological personal history, and the history of premature deciduous tooth loss. Multivariate analysis to identify factors associated with premature deciduous tooth loss was performed with CIETmap statistical software. Odds ratio (OR) and 95% confidence interval (CI) were calculated to estimate the strength of the association. RESULTS: The prevalence of premature loss of primary teeth was 40% (43/109). The leading cause was caries (84%, 36/43). The tooth organ with the highest loss occurrence was the lower right second molar (33%, 14/43). Gender was identified as an associated factor, with males having a higher risk of loss (ORa = 2.97; CI95% = 1.33-6.65). CONCLUSIONS: Our results were similar to those reported in other studies. Strategies aimed at health promotion directed at parents and children should be reinforced.

INTRODUCCIÓN: Se considera como pérdida prematura de dientes deciduos a la exfoliación o extracción antes del recambio fisiológico con < 50% o < 75% de la raíz del diente sustituto formado, o si existe > 1 mm de hueso alveolar cubriendo al órgano dentario sucesor permanente. El objetivo de este trabajo fue estimar la prevalencia de pérdida prematura dental en niños e identificar factores asociados en un centro de salud de Acapulco, Guerrero. MÉTODOS: Se llevó a cabo un estudio transversal en el que se recopiló información de 109 expedientes clínicos de niños atendidos de enero de 2019 a agosto de 2021. Se recolectaron datos sociodemográficos de los niños y los padres: nivel socioeconómico, antecedentes personales no patológicos y el antecedente de la pérdida prematura del diente deciduo. Se realizó un análisis multivariado para identificar factores asociados con la pérdida prematura de dientes deciduos con el software estadístico CIETmap. Se calcularon la razón de momios (OR) y el intervalo de confianza (IC) del 95% para estimar el grado de la asociación. RESULTADOS: La prevalencia de pérdida prematura de dientes primarios fue del 40% (43/109). La principal causa fue por caries (84%, 36/43). El órgano dentario con más ocurrencia de pérdida fue el segundo molar inferior derecho (33%, 14/43). Se identificó el sexo como factor asociado, y se observó que el sexo masculino presenta mayor riesgo de pérdida (ORa = 2.97; IC95% = 1.33-6.65). CONCLUSIONES: Nuestros resultados fueron similares a lo reportado en otros estudios. Deben reforzarse las estrategias de promoción de la salud dirigidas a los padres de familia y a sus hijos.

Prevalence of premature loss of deciduous teeth and its relationship with gender among children from Acapulco, Guerrero: a cross-sectional study / Prevalencia de pérdida prematura de dientes deciduos y su relación con el género en niños de Acapulco, Guerrero: estudio transversal

Abstract Background: Premature loss of deciduous teeth is the exfoliation or extraction before physiological replacement with < 50% or < 75% of the root of the substitute tooth formed or if there is > 1 mm of alveolar bone covering the permanent successor tooth organ. This study aimed to estimate the prevalence of premature tooth loss in children and identify associated factors in a health center in Acapulco, Guerrero. Methods: We conducted a cross-sectional study in which we collected information from 109 clinical records of children examined from January 2019 to August 2021. Sociodemographic data of the children and parents were collected: socioeconomic level, non-pathological personal history, and the history of premature deciduous tooth loss. Multivariate analysis to identify factors associated with premature deciduous tooth loss was performed with CIETmap statistical software. Odds ratio (OR) and 95% confidence interval (CI) were calculated to estimate the strength of the association. Results: The prevalence of premature loss of primary teeth was 40% (43/109). The leading cause was caries (84%, 36/43). The tooth organ with the highest loss occurrence was the lower right second molar (33%, 14/43). Gender was identified as an associated factor, with males having a higher risk of loss (ORa = 2.97; CI95% = 1.33-6.65). Conclusions: Our results were similar to those reported in other studies. Strategies aimed at health promotion directed at parents and children should be reinforced.

Resumen Introducción: Se considera como pérdida prematura de dientes deciduos a la exfoliación o extracción antes del recambio fisiológico con < 50% o < 75% de la raíz del diente sustituto formado, o si existe > 1 mm de hueso alveolar cubriendo al órgano dentario sucesor permanente. El objetivo de este trabajo fue estimar la prevalencia de pérdida prematura dental en niños e identificar factores asociados en un centro de salud de Acapulco, Guerrero. Métodos: Se llevó a cabo un estudio transversal en el que se recopiló información de 109 expedientes clínicos de niños atendidos de enero de 2019 a agosto de 2021. Se recolectaron datos sociodemográficos de los niños y los padres: nivel socioeconómico, antecedentes personales no patológicos y el antecedente de la pérdida prematura del diente deciduo. Se realizó un análisis multivariado para identificar factores asociados con la pérdida prematura de dientes deciduos con el software estadístico CIETmap. Se calcularon la razón de momios (OR) y el intervalo de confianza (IC) del 95% para estimar el grado de la asociación. Resultados: La prevalencia de pérdida prematura de dientes primarios fue del 40% (43/109). La principal causa fue por caries (84%, 36/43). El órgano dentario con más ocurrencia de pérdida fue el segundo molar inferior derecho (33%, 14/43). Se identificó el sexo como factor asociado, y se observó que el sexo masculino presenta mayor riesgo de pérdida (ORa = 2.97; IC95% = 1.33-6.65). Conclusiones: Nuestros resultados fueron similares a lo reportado en otros estudios. Deben reforzarse las estrategias de promoción de la salud dirigidas a los padres de familia y a sus hijos.

Tuberculosis con resistencia a fármacos: nuevas definiciones de la OMS y su implicación en la Normativa de SEPAR / Drug Resistant Tuberculosis: New WHO Definitions and Their Implication in the SEPAR Guideline

No disponible

Rational design of an unusual 2D-MOF based on Cu(i) and 4-hydroxypyrimidine-5-carbonitrile as linker with conductive capabilities: a theoretical approach based on high-pressure XRD.

Herein, we present, for the first time, a 2D-MOF based on copper and 4-hydroxypyrimidine-5-carbonitrile as the linker. Each MOF layer is perfectly flat and neutral, as is the case for graphene. High pressure X-ray diffraction measurements reveal that this layered structure can be modulated between 3.01 to 2.78 Å interlayer separation, with an evident piezochromism and varying conductive properties. An analysis of the band structure indicates that this material is conductive along different directions depending on the application of pressure or H doping. These results pave the way for the development of novel layered materials with tunable and efficient properties for pressure-based sensors.

Actualización de la normativa SEPAR «Diagnóstico y tratamiento de la tuberculosis con resistencia a fármacos» / Update of SEPAR guideline «Diagnosis and Treatment of Drug-Resistant Tuberculosis»

La evidencia acumulada en los 3 últimos años sobre el manejo clínico de la tuberculosis (TB) con resistencia a fármacos ha sido tan importante que hace necesario actualizar la normativa que SEPAR publicó en 2017, sobre todo en lo referente a nuevos métodos diagnósticos, a la clasificación racional de los fármacos con actividad frente a Mycobacterium tuberculosis y a los esquemas básicos a recomendar en los pacientes con TB con resistencia a isoniacida, con resistencia a rifampicina o con multifarmacorresistencia. En el diagnóstico de la enfermedad recomendamos la utilización de métodos moleculares rápidos que son útiles además para la detección precoz de mutaciones asociadas a resistencias a fármacos. Para el tratamiento de los enfermos con TB con multifarmacorresistencia se hace necesario dar prioridad a esquemas orales acortados que incluyan bedaquilina, una fluoroquinolona (levofloxacino o moxifloxacino) y linezolid en lugar de los esquemas cortos previamente recomendados con aminoglucósidos y otros muchos fármacos de menor eficacia y más tóxicos. La recomendación de la normativa es que el diseño de los tratamientos en estos pacientes, tanto el inicial como si se precisan cambios, sea consultado siempre con expertos en el manejo de TB con resistencia a fármacos y que se realicen por personal con experiencia en TB y en unidades que garanticen la supervisión de los tratamientos y el abordaje de sus reacciones adversas

New evidence and knowledge about the clinical management of drug-resistant tuberculosis (TB) in the last 3 years, makes it necessary to update the recent guideline published by SEPAR in 2017, mainly in relation to new diagnostic methods, drug classification, and regimens of treatment recommended to treat patients with isoniazid-resistance TB, rifampicin resistance TB and multidrug-resistant TB. With respect to tuberculosis diagnosis, we recommend the use of rapid molecular assays that also help to detect mutations associated with resistance. In relation to the treatment of multidrug-resistant TB we prioritize effective all-oral shorter treatment regimens including bedaquiline, a fluoroquinolone (levofloxacin or moxifloxacin), bedaquiline and linezolid, instead of the previously recommended short-course treatment with aminoglycosides and other less effective and more toxic drugs. The design of these regimens (initial schedule and changes in the regimen if necessary) should be made in accordance with drug-resistant TB experts; the treatment should be the responsibility of personnel with experience in the treatment of TB and in TB units guaranteeing the follow-up of the treatment and the management of drugs adverse effects

Update of SEPAR guideline «Diagnosis and Treatment of Drug-Resistant Tuberculosis¼. / Actualización de la normativa SEPAR «Diagnóstico y tratamiento de la tuberculosis con resistencia a fármacos¼.

New evidence and knowledge about the clinical management of drug-resistant tuberculosis (TB) in the last 3 years, makes it necessary to update the recent guideline published by SEPAR in 2017, mainly in relation to new diagnostic methods, drug classification, and regimens of treatment recommended to treat patients with isoniazid-resistance TB, rifampicin resistance TB and multidrug-resistant TB. With respect to tuberculosis diagnosis, we recommend the use of rapid molecular assays that also help to detect mutations associated with resistance. In relation to the treatment of multidrug-resistant TB we prioritize effective all-oral shorter treatment regimens including bedaquiline, a fluoroquinolone (levofloxacin or moxifloxacin), bedaquiline and linezolid, instead of the previously recommended short-course treatment with aminoglycosides and other less effective and more toxic drugs. The design of these regimens (initial schedule and changes in the regimen if necessary) should be made in accordance with drug-resistant TB experts; the treatment should be the responsibility of personnel with experience in the treatment of TB and in TB units guaranteeing the follow-up of the treatment and the management of drugs adverse effects.

Ethambutol-resistant Mycobacterium kansasii cervical lymphadenitis in an immunocompetent adult patient: A case report and literature review.

Mycobacterium kansasii extrapulmonary infections are infrequent in immunocompetent adults. Rifampin (RIF), clarithromycin (CLR), isoniazid (INH) and ethambutol (EMB) are included in all the standard regimens against M.kansasii. We report a case of a healthy 65-year-old male farmer who presented with isolated right supraclavicular lymphadenopathy. The lymph node FNA showed acid-fast-bacilli and granulomatous inflammation. Quantiferon TB Gold test, HIV serology, and functional immunological studies were all negative or normal. He was put on a standard 4 drugs anti-tuberculous regimen that was switched to RIF + CLR+ INH after the Microbiology lab demonstrated an EMB-resistant Mycobacterium kansasii isotype I strain. The patient was cured after 12 months of therapy. This is the 6th reported case of M. kansasii extrapulmonary lymphadenitis in an immunocompetent adult and the 2nd showing EMB resistance in the world literature. Antimycobacterial regimens against M. kansasii, classically resistant to pyrazinamide (PZA) might also exclude EMB due to its increasing resistance in Europe. A 612 months therapy with at least 2 effective antimycobacterial drugs including RIF + CLR might be enough to treat extrapulmonary M. kansasii infections in immunocompetents.

Comentarios a la normativa SEPAR de diagnóstico y tratamiento de la tuberculosis con resistencia a fármacos / Comments on the SEPAR Guidelines for the Diagnosis and Treatment of Drug-Resistant Tuberculosis

No disponible

Diagnóstico y tratamiento de la tuberculosis con resistencia a fármacos / Diagnosis and treatment of drug-resistant tuberculosis

En las últimas 2 décadas la tuberculosis con resistencia a fármacos se ha convertido en una amenaza y un reto para la salud pública mundial. El diagnóstico y el tratamiento de estas formas de tuberculosis es mucho más complejo, y el pronóstico empeora claramente a medida que se incrementa el patrón de las resistencias. Sin embargo, es necesario destacar cómo con el manejo clínico y programático adecuado de estos enfermos se puede conseguir la curación de una mayoría de ellos. En esta normativa se razonan las bases del diagnóstico y tratamiento de todos los pacientes afectos de tuberculosis, desde aquellos que tienen formas de la enfermedad con sensibilidad a todos los fármacos hasta aquellos que son portadores de los patrones más extensos de resistencia. Asimismo, se dan recomendaciones específicas para cada uno de estos supuestos. También se aborda el papel que ya están teniendo y pueden tener en un futuro inmediato los nuevos métodos moleculares de detección de resistencias, los esquemas acortados de tratamiento de la tuberculosis multi-farmacorresistente (TB-MDR) y los nuevos fármacos con actividad frente a Mycobacterium tuberculosis (AU)

In the last 2 decades, drug-resistant tuberculosis has become a threat and a challenge to worldwide public health. The diagnosis and treatment of these forms of tuberculosis are much more complex and prognosis clearly worsens as the resistance pattern intensifies. Nevertheless, it is important to remember that with the appropriatesystematic clinical management, most of these patients can be cured. These guidelines itemize the basis for the diagnosis and treatment of all tuberculosis patients, from those infected by strains that are sensitive to all drugs, to those who are extensively drug-resistant. Specific recommendations are given forall cases. The current and future role of new molecular methods for detecting resistance, shorter multi-drug-resistant tuberculosis regimens, and new drugs with activity against Mycobacterium tuberculosis are also addressed (AU)

Diagnosis and Treatment of Drug-Resistant Tuberculosis. / Diagnóstico y tratamiento de la tuberculosis con resistencia a fármacos.

In the last 2 decades, drug-resistant tuberculosis has become a threat and a challenge to worldwide public health. The diagnosis and treatment of these forms of tuberculosis are much more complex and prognosis clearly worsens as the resistance pattern intensifies. Nevertheless, it is important to remember that with the appropriatesystematic clinical management, most of these patients can be cured. These guidelines itemize the basis for the diagnosis and treatment of all tuberculosis patients, from those infected by strains that are sensitive to all drugs, to those who are extensively drug-resistant. Specific recommendations are given forall cases. The current and future role of new molecular methods for detecting resistance, shorter multi-drug-resistant tuberculosis regimens, and new drugs with activity against Mycobacterium tuberculosis are also addressed.

Pharmacological Potential of Phylogenetically Diverse Actinobacteria Isolated from Deep-Sea Coral Ecosystems of the Submarine Avilés Canyon in the Cantabrian Sea.

Marine Actinobacteria are emerging as an unexplored source for natural product discovery. Eighty-seven deep-sea coral reef invertebrates were collected during an oceanographic expedition at the submarine Avilés Canyon (Asturias, Spain) in a range of 1500 to 4700 m depth. From these, 18 cultivable bioactive Actinobacteria were isolated, mainly from corals, phylum Cnidaria, and some specimens of phyla Echinodermata, Porifera, Annelida, Arthropoda, Mollusca and Sipuncula. As determined by 16S rRNA sequencing and phylogenetic analyses, all isolates belong to the phylum Actinobacteria, mainly to the Streptomyces genus and also to Micromonospora, Pseudonocardia and Myceligenerans. Production of bioactive compounds of pharmacological interest was investigated by high-performance liquid chromatography (HPLC) and gas chromatography-mass spectrometry (GC-MS) techniques and subsequent database comparison. Results reveal that deep-sea isolated Actinobacteria display a wide repertoire of secondary metabolite production with a high chemical diversity. Most identified products (both diffusible and volatiles) are known by their contrasted antibiotic or antitumor activities. Bioassays with ethyl acetate extracts from isolates displayed strong antibiotic activities against a panel of important resistant clinical pathogens, including Gram-positive and Gram-negative bacteria, as well as fungi, all of them isolated at two main hospitals (HUCA and Cabueñes) from the same geographical region. The identity of the active extracts components of these producing Actinobacteria is currently being investigated, given its potential for the discovery of pharmaceuticals and other products of biotechnological interest.

Electrically switchable magnetic molecules: inducing a magnetic coupling by means of an external electric field in a mixed-valence polyoxovanadate cluster.

Herein we evaluate the influence of an electric field on the coupling of two delocalized electrons in the mixed-valence polyoxometalate (POM) [GeV14 O40 ](8-) (in short V14 ) by using both a t-J model Hamiltonian and DFT calculations. In absence of an electric field the compound is paramagnetic, because the two electrons are localized on different parts of the POM. When an electric field is applied, an abrupt change of the magnetic coupling between the two delocalized electrons can be induced. Indeed, the field forces the two electrons to localize on nearest-neighbors metal centers, leading to a very strong antiferromagnetic coupling. Both theoretical approaches have led to similar results, emphasizing that the sharp spin transition induced by the electric field in the V14 system is a robust phenomenon, intramolecular in nature, and barely influenced by small changes on the external structure.

Strong in vitro activities of two new rifabutin analogs against multidrug-resistant Mycobacterium tuberculosis.

Two new rifabutin analogs, RFA-1 and RFA-2, show high in vitro antimycobacterial activities against Mycobacterium tuberculosis. MIC values of RFA-1 and RFA-2 were ≤0.02 µg/ml against rifamycin-susceptible strains and 0.5 µg/ml against a wide selection of multidrug-resistant strains, compared to ≥50 µg/ml for rifampin and 10 µg/ml for rifabutin. Molecular dynamic studies indicate that the compounds may exert tighter binding to mutants of RNA polymerase that have adapted to the rifamycins.

Anomalous transport and possible phase transition in palladium nanojunctions.

Many phenomena in condensed matter are thought to result from competition between different ordered phases. Palladium is a paramagnetic metal close to both ferromagnetism and superconductivity and is, therefore, a potentially interesting material to consider. Nanoscale structuring of matter can modify relevant physical energy scales, leading to effects such as locally modified magnetic interactions. We present transport measurements in electromigrated palladium break junction devices showing the emergence at low temperatures of anomalous sharp features in the differential conductance. These features appear symmetrically in applied bias and exhibit a temperature dependence of their characteristic voltages reminiscent of a mean-field phase transition. The systematic variation of these voltages with zero bias conductance, together with density functional theory calculations illustrating the relationship between the magnetization of Pd and atomic coordination, suggests that the features may result from the onset of spontaneous magnetization in the nanojunction electrodes. We propose that the characteristic conductance features are related to inelastic tunneling involving magnetic excitations.

New rifabutin analogs: synthesis and biological activity against Mycobacterium tuberculosis.

The synthesis, structure, and biological evaluation of a series of novel rifamycin derivatives, Rifastures (RFA) with potent anti-tuberculosis activity are presented. Some of these derivatives showed higher in vitro activity than rifabutin and rifampicin against not only Mycobacterium tuberculosis strains but also against MAC and Mycobacterium kansasii.