Mfd Protects Against Oxidative Stress in Bacillus Subtilis Independently of its Canonical Function in DNA Repair

Background: Previous reports showed that mutagenesis in nutrient-limiting conditions is dependent on Mfd in Bacillus subtilis. Mfd initiates one type of transcription-coupled repair (TCR); this type of repair is known to target bulky lesions, like those associated with UV exposure. Interestingly, the roles of Mfd in repair of oxidative-promoted DNA damage and regulation of transcription differ. Here, we used a genetic approach to test whether Mfd protected B. subtilis from exposure to two different oxidants. Results: Wild-type cells survived tert-butyl hydroperoxide (t-BHP) exposure significantly better than Mfd-deficient cells. This protective effect was independent of UvrA, a component of the canonical TCR/nucleotide excision repair (NER) pathway. Further, our results suggest that Mfd and MutY, a DNA glycosylase that processes 8-oxoG DNA mismatches, work together to protect cells from lesions generated by oxidative damage. We also tested the role of Mfd in mutagenesis in starved cells exposed to t-BHP. In conditions of oxidative stress, Mfd and MutY may work together in the formation of mutations. Unexpectedly, Mfd increased survival when cells were exposed to the protein oxidant diamide. Under this type of oxidative stress, cells survival was not affected by MutY or UvrA. Conclusions: These results are significant because they show that Mfd mediates error-prone repair of DNA and protects cells against oxidation of proteins by affecting gene expression; Mfd deficiency resulted in increased gene expression of the OhrR repressor which controls the cellular response to organic peroxide exposure. These observations point to Mfd functioning beyond a DNA repair factor in cells experiencing oxidative stress

La planificación y gestión urbana. En escalas local-metrópolis-global

Las estrategias para planificar, gestionar y diseñar las ciudades venezolanas ha mostrado con más entereza la presencia de asentamientos informales. Por ello, cuando se inicia en Venezuela la descentralización de la toma de decisiones, otorgándole nuevos poderes a las comunidades o consejos comunales, se producen cambios en la formación de la metrópolis, complejizandola de tal manera que incluye diversidad integrada a la realidad global de las ciudades venezolanas. Por consiguiente, la realidad metropolitana sustenta una compleja trama, hasta transformar las redes de interacciones entre el sujeto y la externalidad de la estructura social y colectiva.AbstractThe strategies to plan, to negotiate and to design the Venezuelan cities, it has shown with more integrity the presence of informal establishments. In and of itself, when he/she begins in Venezuela the decentralization of the taking of decisions, granting new powers to the communities or communal advice, changes take place in the formation of the metropolises, completing it in such a way and it includes integrated diversity to the global reality of the Venezuelan cities. Consequently, the metropolitan reality sustains a complex plot, until transforming the nets of interactions between the fellow and the externality  of the social and collective structure.</p

Constitutional Confidentiality

Federal Certificates of Confidentiality (“Certificates”) protect sensitive information about human research subjects from disclosure and use in judicial, administrative, and legislative proceedings at both the state and federal levels. When they were first authorized by Congress in the 1970s, Certificates covered sensitive information collected in research about drug addiction use. Today, however, they extend to virtually all personal information gathered by biomedical research studies. The broad reach of Certificates, coupled with their power to override state subpoenas and warrants issued in the context of law enforcement, abortion regulation, and other police powers typically under state control, beg the question whether Certificates are constitutional. This Article, for the first time, examines the fundamental constitutional underpinnings of Certificates and situates them within the context of federal statutory privilege law. In so doing, it makes several contributions to the existing literature. First, after a brief background about Certificates and other congressional action relating to biomedical research, this Article argues that the Certificate statute creates a federal statutory privilege. To date, the language of privilege has been wholly absent from discussions of Certificates and their reach. Yet understanding the Certificate as a privilege provides well understood nomenclature and legal principles for applying the Certificate statute. Second, this Article locates the primary constitutional authority undergirding the Certificate statute in the Commerce Clause. Third, this Article argues that Congress’s power to tax and spend provides further constitutional grounding for Certificates, at least with respect to federally-funded researchers and institutions. For both bases of constitutional authority, this Article maps new territory, yielding clarity where there has previously been uncertainty. Fourth, this Article brings together constitutional doctrines limiting both congressional power and evidentiary privileges to illuminate how these doctrines may require Certificate protections to give way in exceptional cases. In so doing, it bridges traditional constitutional law and evidence law, reaping insights from their intersection from which scholars in both fields may benefit. Finally, this Article considers the implications of this constitutional analysis not only on Certificates, but also on congressional action aimed at regulating human subjects research more generally and on the law surrounding federal statutory privileges

Textural and geochemical features of freshwater microbialites from Laguna Bacalar, Quintana Roo, Mexico

Microbialites provide some of the oldest direct evidence of life on Earth. They reached their peak during the Proterozoic and declined afterward. Their decline has been attributed to grazing and/or burrowing by metazoans, to changes in ocean chemistry, or to competition with other calcifying organisms. The freshwater microbialites at Laguna Bacalar (Mexico) provide an opportunity to better understand microbialite growth in terms of interaction between grazing organisms versus calcium carbonate precipitation. The Laguna Bacalar microbialites are described in terms of their distinct mesostructures. Stromatolites display internal lamination, attributed to the precipitation of calcite and the upward migration of cyanobacteria during periods of low sedimentation. Thrombolitic stromatolites show internal lamination in addition to internal clotting. The clotting is seen as a result of binding and/or trapping of micritic peloids by cyanobacteria and attributed to periods of high sedimentation. The carbonates in both microbialites had similar C- and O-stable–isotopic signatures, both enriched in ^(13)C relative to bivalves, suggesting photosynthetic CO_2 uptake was the trigger for carbonate precipitation. This implies that the rate of microbialite growth is largely a function of ambient carbonate saturation state, while the texture is especially dependent on accretion rates and sediment deposition on their surface. Importantly, the coexistence with grazing animals suggests no significant inhibition on microbialite growth, thereby calling into question the decline of microbialite as a result of metazoan evolution. Varying sedimentation rates are likely important in controlling the distribution of thrombolite–stromatolite packages in the geological record, given the importance of this factor at Bacalar

Propuesta de mejora en las áreas de producción y logística para reducir los costos operacionales de un molino en la ciudad de Trujillo

El presente trabajo tiene como objetivo diagnosticar los costos operacionales en las áreas de producción y logística para diseñar una propuesta de mejora e incrementar su rentabilidad. Se inició con un diagnóstico y análisis de la situación actual de dichas áreas, obteniendo como resultado que en ambas se generan pérdidas mensuales de S/6098.95. Asimismo, se identificaron y desarrollaron herramientas de mejora para cada uno de los problemas con mayor valorización por los trabajadores del molino relacionados con la gestión de producción y logística: un Plan de Mantenimiento Preventivo, un Procedimiento Estándar y MRP, un formato Kárdex, la Metodología 5S y ABC. Por último, se realizó una evaluación económica financiera para la factibilidad y rentabilidad de la propuesta y se obtuvo el beneficio por un valor de S/. 2002.49, un VAN de S/14150, TIR de 26% y B/C de 2.85, con un periodo de recuperación de la inversión de 12 meses, por lo que se demostró que la propuesta es viable

La satisfacción laboral y el compromiso organizacional de los colaboradores de la empresa Makro Supermayorista con sede en Huancayo

El presente trabajo muestra el análisis de la relación existente entre el compromiso organizacional y la satisfacción laboral de los colaboradores de La empresa Makro Supermayorista Para lograr este objetivo se utilizó los instrumentos: Cuestionario de Satisfacción Laboral S20/23 de José L. Meliá y José M. Peiró (1998) y Escala Compromiso Organizacional (Natalie J. Allen y John P. Meyer, 1991); estos se aplicaron a una muestra conformada por 81 colaboradores de diferente género, antigüedad laboral, grado de instrucción y área de trabajo. Luego de procesar los datos, los resultados reflejaron que existe una relación directa entre ambas variables y esta es positiva., ya que cuenta con estrategias y cualidades que refuerzan estos criterios en los colaboradores, aunque se debe reforzar

Electromagnetic Evidence that SSS17a is the Result of a Binary Neutron Star Merger

11 hours after the detection of gravitational wave source GW170817 by the Laser Interferometer Gravitational-Wave Observatory and Virgo Interferometers, an associated optical transient SSS17a was discovered in the galaxy NGC 4993. While the gravitational wave data indicate GW170817 is consistent with the merger of two compact objects, the electromagnetic observations provide independent constraints of the nature of that system. Here we synthesize all optical and near-infrared photometry and spectroscopy of SSS17a collected by the One-Meter Two-Hemisphere collaboration. We find that SSS17a is unlike other known transients. The source is best described by theoretical models of a kilonova consisting of radioactive elements produced by rapid neutron capture (the r-process). We find that SSS17a was the result of a binary neutron star merger, reinforcing the gravitational wave result.Comment: 21 pages, 4 figures, accepted to Scienc

Connecting healthcare with income maximisation services, and their financial, health and well-being impacts for families with young children : a systematic review protocol

Introduction: Poverty has far-reaching and detrimental effects on children’s physical and mental health, across all geographies. Financial advice and income-maximisation services can provide a promising opportunity for shifting the physical and mental health burdens that commonly occur with financial hardship, yet awareness of these services is limited, and referrals are not systematically integrated into existing healthcare service platforms. We aim to map and synthesise evidence on the impact of healthcare-income maximisation models of care for families of children aged 0–5 years in high-income countries on family finances, parent/caregiver(s) or children’s health and well-being. Methods and analysis: To be included in the review, studies must be families (expectant mothers or parents/ caregivers) of children who are aged between 0 and 5 years, accessing a healthcare service, include a referral from healthcare to an income-maximisation service (ie, financial counselling), and examine impacts on child and family health and well-being. A comprehensive electronic search strategy will be used to identify studies written in English, published from inception to January 2021, and indexed in MEDLINE, EMBase, PsycINFO, CINAHL, Proquest, Family & Society Studies Worldwide, Cochrane Library, and Informit Online. Search strategies will include terms for: families, financial hardship and healthcare, in various combinations. Bibliographies of primary studies and review articles meeting the inclusion criteria will be searched manually to identify further eligible studies, and grey literature will also be searched. Data on objective and self-reported outcomes and study quality will be independently extracted by two review authors; any disagreements will be resolved through a third reviewer. The protocol follows the Preferred Reporting Items for Systematic Review and Meta-Analysis Protocols. Ethics and dissemination: Ethical approval is not required. The results will be disseminated widely via peer-reviewed publication and presentations at conferences related to this field. PROSPERO registration number CRD42020195985

CMZoom: Survey Overview and First Data Release

We present an overview of the CMZoom survey and its first data release. CMZoom is the first blind, high-resolution survey of the Central Molecular Zone (CMZ; the inner 500 pc of the Milky Way) at wavelengths sensitive to the pre-cursors of high-mass stars. CMZoom is a 500-hour Large Program on the Submillimeter Array (SMA) that mapped at 1.3 mm all of the gas and dust in the CMZ above a molecular hydrogen column density of 10^23 cm^-2 at a resolution of ~3" (0.1 pc). In this paper, we focus on the 1.3 mm dust continuum and its data release, but also describe CMZoom spectral line data which will be released in a forthcoming publication. While CMZoom detected many regions with rich and complex substructure, its key result is an overall deficit in compact substructures on 0.1 - 2 pc scales (the compact dense gas fraction: CDGF). In comparison with clouds in the Galactic disk, the CDGF in the CMZ is substantially lower, despite having much higher average column densities. CMZ clouds with high CDGFs are well-known sites of active star formation. The inability of most gas in the CMZ to form compact substructures is likely responsible for the dearth of star formation in the CMZ, surprising considering its high density. The factors responsible for the low CDGF are not yet understood but are plausibly due to the extreme environment of the CMZ, having far-reaching ramifications for our understanding of the star formation process across the cosmos.Comment: Accepted for Publication in ApJ