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The genetic and biochemical basis of perchlorate-dependent H 2 S oxidation (PSOX) was investigated in the dissimilatory perchlorate-reducing microorganism (DPRM) Azospira suillum PS (PS). Previously, it was shown that all known DPRMs innately oxidize H 2 S, producing elemental sulfur (S o ). Although the process involving PSOX is thermodynamically favorable ( ΔG °′ = −206 kJ ⋅ mol −1 H 2 S), the underlying biochemical and genetic mechanisms are currently unknown. Interestingly, H 2 S is preferentially utilized over physiological electron donors such as lactate or acetate although no growth benefit is obtained from the metabolism. Here, we determined that PSOX is due to a combination of enzymatic and abiotic interactions involving reactive intermediates of perchlorate respiration. Using various approaches, including barcode analysis by sequencing (Bar-seq), transcriptome sequencing (RNA-seq), and proteomics, along with targeted mutagenesis and biochemical characterization, we identified all facets of PSOX in PS. In support of our proposed model, deletion of identified upregulated PS genes traditionally known to be involved in sulfur redox cycling (e.g., Sox, sulfide:quinone reductase [SQR]) showed no defect in PSOX activity. Proteomic analysis revealed differential abundances of a variety of stress response metal efflux pumps and divalent heavy-metal transporter proteins, suggesting a general toxicity response. Furthermore, in vitro biochemical studies demonstrated direct PSOX mediated by purified perchlorate reductase (PcrAB) in the absence of other electron transfer proteins. The results of these studies support a model in which H 2 S oxidation is mediated by electron transport chain short-circuiting in the periplasmic space where the PcrAB directly oxidizes H 2 S to S o . The biogenically formed reactive intermediates (ClO 2 − and O 2 ) subsequently react with additional H 2 S, producing polysulfide and S o as end products. IMPORTANCE Inorganic sulfur compounds are widespread in nature, and microorganisms are central to their transformation, thereby playing a key role in the global sulfur cycle. Sulfur oxidation is mediated by a broad phylogenetic diversity of microorganisms, including anoxygenic phototrophs and either aerobic or anaerobic chemotrophs coupled to oxygen or nitrate respiration, respectively. Recently, perchlorate-respiring microorganisms were demonstrated to be innately capable of sulfur oxidation regardless of their phylogenetic affiliation. As recognition of the prevalence of these organisms intensifies, their role in global geochemical cycles is being queried. This is further highlighted by the recently recognized environmental pervasiveness of perchlorate not only across Earth but also throughout our solar system. The inferred importance of this metabolism not only is that it is a novel and previously unrecognized component of the global sulfur redox cycle but also is because of the recently demonstrated applicability of perchlorate respiration in the control of biogenic sulfide production in engineered environments such as oil reservoirs and wastewater treatment facilities, where excess H 2 S represents a significant environmental, process, and health risk, with associated costs approximating$90 billion annually. Inorganic sulfur compounds are widespread in nature, and microorganisms are central to their transformation, thereby playing a key role in the global sulfur cycle. Sulfur oxidation is mediated by a broad phylogenetic diversity of microorganisms, including anoxygenic phototrophs and either aerobic or anaerobic chemotrophs coupled to oxygen or nitrate respiration, respectively. Recently, perchlorate-respiring microorganisms were demonstrated to be innately capable of sulfur oxidation regardless of their phylogenetic affiliation. As recognition of the prevalence of these organisms intensifies, their role in global geochemical cycles is being queried. This is further highlighted by the recently recognized environmental pervasiveness of perchlorate not only across Earth but also throughout our solar system. The inferred importance of this metabolism not only is that it is a novel and previously unrecognized component of the global sulfur redox cycle but also is because of the recently demonstrated applicability of perchlorate respiration in the control of biogenic sulfide production in engineered environments such as oil reservoirs and wastewater treatment facilities, where excess H 2 S represents a significant environmental, process, and health risk, with associated costs approximating $ 90 billion annually.

Recent work has suggested that the electrical self‐potential (SP) geophysical technique may be used to noninvasively map redox conditions associated with contaminant plumes or bioremediation schemes. The proposed mechanism linking SP response and redox involves the generation of a current source and sink in the subsurface whereby electrons are transferred between anoxic and oxic environments via a conductive biofilm and/or biominerals, creating a biogeobattery. To investigate the conditions required for biogeobattery formation, we successfully created contrasting redox zones in a flow‐through column setup. In this setup, an oxic section, containing clean sand, transitioned into an Fe(III)‐reducing section. Fe(III) reduction was mediated by either a natural microbial community or a pure culture of the model organism Shewanella oneidensis MR‐1 in two different column experiments. Visual observations and electron microscopy showed that ferrihydrite was sequentially transformed to goethite and magnetite; despite this change, no SP signal was generated in either column. Electron microscopy suggested that in the pure culture column, S. oneidensis MR‐1 cells did not form a continuous, interconnected biofilm but rather interacted with the iron (oxyhydr)oxide surfaces as individual cells. In our experiments we therefore did not form the conductor of the biogeobattery. We thus conclude that generation of a biogeobattery is nontrivial and requires specific geochemical and microbiological conditions that will not occur at every contaminated site undergoing microbially mediated redox processes. This conclusion suggests that SP cannot be used in isolation to monitor subsurface biogeochemical conditions. Key Points Microbially induced redox gradients do not necessarily yield SP signals Careful electrode design required in biogeophysics experiments Very specific conditions required for biogeobattery, rare in nature

Scratches on bones have routinely been attributed to tooth marks (a predominantly untested speculation), ignoring the effects of claws, perhaps because of the general assumption that claws are too soft to damage bone. However, some pathologies appears to be more compatible with claw rather than tooth impacts. Therefore, it is critical to determine if the claws of any animal are capable of scratching into the surface of any bone--a test and proof of concept. A tiger enrichment program was used to document actual bone damage unequivocally caused by claws, by assuring that the tiger had access to bones only by using its paws (claws). The spectrum of mechanisms causing bone damage was expanded by evidentiary analysis of claw-induced pathology. While static studies suggested that nails/claws could not disrupt bone, specific tiger enrichment activities documented that bones were susceptible to damage from the kinetic energy effect of the striking claw. This documents an expanded differential consideration for scratch marks on bone and evidences the power of the claw.

The purpose of this project is to explore the feasibility of a new approach for producing evidence-based distractor sets. We use Common Wrong Answers (CWAs), and the associated performance data, generated by candidate responses to open gap-fill tasks, to produce distractor sets for multiple-choice gap-fill tasks based on the same texts. We then investigate whether these distractor sets are effective for use in language tests, in terms of empirical and qualitative review, and consider potential impacts on the production process for test material. This project explores a new and innovative method of content development, and raises the possibility of a new approach to item production that can semi-autogenerate test items in shorter periods of time without affecting quality or reliability. Although the approach is specific to one task type, it is hoped that further research will expand on the applications of the approach to deliver a version that may be operationalised for use across different task types in the development of language assessments.

This diagnostic study describes an online tool created with actual severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) virus copy number data to help policy makers understand how pooled testing compares with single-sample testing in different populations.

BackgroundRecent advances in next-generation sequencing have allowed for an increase in molecular tumor profiling.ObjectiveWe sought to assess the actionability and clinical utilization of molecular tumor profiling results obtained via Foundation Medicine tumor sequencing tests in uterine and ovarian cancers.Patients and MethodsWe performed a single-institution retrospective chart review to obtain demographic and clinical information in patients with uterine and ovarian cancer whose tumors were submitted to Foundation Medicine for molecular tumor profiling over a 7-year period. Alterations identified on testing were stratified according to the OncoKB database actionability algorithm. Descriptive statistics were primarily used to analyze the data.ResultsTumors from 185 women with gynecologic cancer were submitted for molecular tumor profiling between 2013 and 2019. The majority of tests (144/185; 78%) were ordered after a diagnosis of recurrence. In 60 (32%), no actionable molecular alteration was identified. Thirteen (7%) identified an alteration that directed to a US Food and Drug Administration-approved therapy in that tumor type, while 112 (61%) had alterations with investigational or hypothetical treatment implications. In patients with any actionable finding, treatment was initiated in 27 (15%) based on these results.ConclusionsThe majority of uterine and ovarian cancers (93%) did not have molecular alterations with corresponding Food and Drug Administration-approved treatments. Even in patients with a potentially actionable alteration, gynecologic oncologists were more likely to choose an alternative therapy. Further investigation is warranted to determine which patients with uterine and ovarian cancer are most likely to benefit from molecular tumor profiling and the ideal timing of testing. The potential to identify effective therapeutic options in a minority of patients needs to be balanced with the current limited clinical applicability of these results in most cases.

The genetic and biochemical basis of perchlorate-dependent H S oxidation (PSOX) was investigated in the dissimilatory perchlorate-reducing microorganism (DPRM) PS (PS). Previously, it was shown that all known DPRMs innately oxidize H S, producing elemental sulfur (S ). Although the process involving PSOX is thermodynamically favorable ( °' = -206 kJ ⋅ mol H S), the underlying biochemical and genetic mechanisms are currently unknown. Interestingly, H S is preferentially utilized over physiological electron donors such as lactate or acetate although no growth benefit is obtained from the metabolism. Here, we determined that PSOX is due to a combination of enzymatic and abiotic interactions involving reactive intermediates of perchlorate respiration. Using various approaches, including barcode analysis by sequencing (Bar-seq), transcriptome sequencing (RNA-seq), and proteomics, along with targeted mutagenesis and biochemical characterization, we identified all facets of PSOX in PS. In support of our proposed model, deletion of identified upregulated PS genes traditionally known to be involved in sulfur redox cycling (e.g., Sox, sulfide:quinone reductase [SQR]) showed no defect in PSOX activity. Proteomic analysis revealed differential abundances of a variety of stress response metal efflux pumps and divalent heavy-metal transporter proteins, suggesting a general toxicity response. Furthermore, biochemical studies demonstrated direct PSOX mediated by purified perchlorate reductase (PcrAB) in the absence of other electron transfer proteins. The results of these studies support a model in which H S oxidation is mediated by electron transport chain short-circuiting in the periplasmic space where the PcrAB directly oxidizes H S to S The biogenically formed reactive intermediates (ClO and O ) subsequently react with additional H S, producing polysulfide and S as end products. Inorganic sulfur compounds are widespread in nature, and microorganisms are central to their transformation, thereby playing a key role in the global sulfur cycle. Sulfur oxidation is mediated by a broad phylogenetic diversity of microorganisms, including anoxygenic phototrophs and either aerobic or anaerobic chemotrophs coupled to oxygen or nitrate respiration, respectively. Recently, perchlorate-respiring microorganisms were demonstrated to be innately capable of sulfur oxidation regardless of their phylogenetic affiliation. As recognition of the prevalence of these organisms intensifies, their role in global geochemical cycles is being queried. This is further highlighted by the recently recognized environmental pervasiveness of perchlorate not only across Earth but also throughout our solar system. The inferred importance of this metabolism not only is that it is a novel and previously unrecognized component of the global sulfur redox cycle but also is because of the recently demonstrated applicability of perchlorate respiration in the control of biogenic sulfide production in engineered environments such as oil reservoirs and wastewater treatment facilities, where excess H S represents a significant environmental, process, and health risk, with associated costs approximating $90 billion annually.

Scratches on bones have routinely been attributed to tooth marks (a predominantly untested speculation), ignoring the effects of claws, perhaps because of the general assumption that claws are too soft to damage bone. However, some pathologies appears to be more compatible with claw rather than tooth impacts. Therefore, it is critical to determine if the claws of any animal are capable of scratching into the surface of any bone - a test and proof of concept. A tiger enrichment program was used to document actual bone damage unequivocally caused by claws, by assuring that the tiger had access to bones only by using its paws (claws). The spectrum of mechanisms causing bone damage was expanded by evidentiary analysis of claw-induced pathology. While static studies suggested that nails/claws could not disrupt bone, specific tiger enrichment activities documented that bones were susceptible to damage from the kinetic energy effect of the striking claw. This documents an expanded differential consideration for scratch marks on bone and evidences the power of the claw.

Individuals are dismissing long held notions of upward mobility and assuming more responsibility for their own career outlook. Yet, there is a notable gap in the career success literature as it relates to the examination of intrinsic predictors of career success. Surprisingly, the preponderance of variables that have been found to predict career success presuppose a level of accessibility or control that is typically outside the realm of likelihood for most individuals. In this study, such variables are called chance factors, which is to suggest, relying too heavily on variables such as tenure, sponsorship, networking, and gender will leave your hopes for achieving career success up to chance. Therefore, this study is primarily concerned with identifying novel predictors of career success. And more specifically, exploring the statistical relationship between career success and a non-chance factor, self-leadership is the process to doing so. To this end, this study examined the correlation between objective and subjective career success and self-leadership, a leader theory that is grounded in intrinsic behavioral and cognitive dimensions in order to determine if self-leadership is a predictor of career success. The results of the student purport that of the nine subsets that make-up the behavioral and cognitive domains self-leadership, self-goal setting was the sole variable that strongly correlated with subjective career success. Consequently, a goal setting model comprised of three successive goal related capacities: setting goals, implementation of objectives to realize goals, and attainment of goals was used to future explore the implications of self-goal setting and its relationship to career satisfactory.

Due to the Covid-19 pandemic in 2020 or other business decisions, remote work is becoming increasingly popular. \"Remote first\" working environments exist within companies where most employees work remotely. This paper takes a deep dive into the remote-first mentality. It investigates its effects on employees at varying stages in their careers, day-to-day productivity, and working relationships with team members. We found that the remote-first mentality most impacts seasoned employees and managers, potentially due to trouble adjusting to a new way of working compared to the rest of their careers and the \"always on\" mentality associated with working from home. Regarding productivity, we found that while software development productivity appears unimpacted, the effectiveness of communication and employee wellbeing saw declines which are generally associated with lowered productivity. Finally, we looked closer at the communication side of things and how remote work impacts relationship building. We found that the most significant impacts on relationship building centered around \"trust\" and \"credibility\" being harder to build due to a lack of non-verbal cues during social interactions.