Characterization of Siliceous Nodules in Western Kefalonia Ιsland Greece: An Initial Approach to Their Formation and Diagenetic Characteristics

In this study, siliceous nodules from the world-famous Myrtos beach, as well as from Avithos beach, in the western flanks of Kefalonia Island in Greece are examined by means of petrographical, mineralogical, geochemical and micropaleontological methods. The objectives of this study are to characterize the textural and compositional features of the nodules, with the aim to provide an initial interpretation of their origin and their diagenetic evolution. The studied siliceous nodules are hosted within Lower Cretaceous thin-bedded limestones at Myrtos and Upper Eocene limestones at Avithos. Nodules from both areas display a characteristic concentric texture at a macroscopic and microscopic scale. They both have a dense fine-grained siliceous sedimentary fabric, composed mainly of microcrystalline or cryptocrystalline quartz and moganite with common residual calcite in the case of Avithos. These results, and in particular the shape of the nodules, along the textural and compositional characteristics, indicate different conditions of formation in the two localities, both during the early epigenetic stages, as well as later during the diagenetic processes. Myrtos nodules originated from Si-precursors deposited in a pelagic environment, going through intense Si-replacement. Avithos nodules were deposited in a more proximal environment, being influenced by a less intense silicification. Nevertheless, the higher degree of recrystallization of Avithos samples indicates a syn- or post-diagenetic tectonic activity that resulted in the circulation of geothermal fluids. The conclusions drawn from this work demonstrate the usefulness of thorough studies of siliceous nodules in order to get a more comprehensive understanding of the initial depositional conditions, as well as diagenetic pathways and processes.

Attrition and Retention in Multidisciplinary Weight Management Interventions for Adults with Obesity: A Systematic Review

Background High rates of attrition undermine the success of weight management interventions (WMIs), but a comprehensive understanding of the factors that increase dropout risk remains absent. This is partly explained by heterogeneity of intervention design, and the absence of a universal definition of attrition. This systematic review aimed to identify the factors related to- and predictive of attrition and retention in multidisciplinary WMIs for adults with obesity. Methods The systematic literature search, conducted in Cochrane, Medline, PsycInfo, and Scopus, aimed to identify original research articles published between February 2008 and December 2019. Articles investigating attrition or retention in multidisciplinary WMIs were eligible for inclusion if interventions were for adults (≥18) with obesity identified by body mass index ≥30kg/M2 and lasted ≥6 months. Multidisciplinary was defined as ≥2 interventionist disciplines or professions, for the purpose of this review. Data was synthesised narratively. Results The literature search resulted in seventeen studies which satisfied the inclusion criteria. Attrition rates ranged from 10% at 3-months to 81% at 3-years. The sociodemographic factors associated with reduced risk of attrition included older age, living in less deprived areas, higher levels of education, and female gender. Poor mental health, low social support, high weight loss goals and poor or unsatisfactory results may increase the likelihood of participant dropout, but evidence was limited and inconclusive because of different methodologies, and only a small number of studies investigating some of the variables. Conclusions The scope for targeted retention strategies is limited because few variables were consistently associated with attrition. Until a comprehensive understanding of attrition emerges, WMIs should seek to reduce social inequities in the benefit of WMI provision. Future research should consider factors reported qualitatively, such as intervention expectations and satisfaction, social support, patient-clinician relationships, and logistical barriers. Adopting a universal definition of attrition and de-homogenising participant dropouts would advance future research. As qualitative evidence is limited, exploring participant experiences of WMIs would help understand how attrition rates can be reduced, and in-turn improve WMI effectiveness.

Critical thinking and diagnostic reasoning when assessing problems with the genitourinary system

Urological conditions have become increasingly common and early diagnosis is key to achieving better outcomes. This article discusses the importance of having a comprehensive understanding of urological disorders, having the skills to interpret relevant information, and recognising the relationships among given elements to make an appropriate clinical diagnosis.

Single Molecule Techniques Can Distinguish the Photophysical Processes Governing Metal-Enhanced Fluorescence

<p>Plasmonic metal nanoparticles can impact the behaviour of organic molecules in a number of ways, including enhancing or quenching fluorescence. Only through a comprehensive understanding of the fundamental photophysical processes regulating nano-molecular interactions can these effects be controlled, and exploited to the fullest extent possible. Metal-enhanced fluorescence (MEF) is governed by two underlying processes, increased rate of fluorophore excitation and increased fluorophore emission, the balance between which has implications for optimizing hybrid nanoparticle-molecular systems for various applications. We report groundbreaking work on the use of single molecule fluorescence microscopy to distinguish between the two mechanistic components of MEF, in a model system consisting of two analogous boron dipyrromethene (BODIPY) fluorophores and triangular silver nanoparticles (AgNP). We demonstrate that the increased excitation MEF mechanism occurs to approximately the same extent for both dyes, but that the BODIPY with the higher quantum yield of fluorescence experiences a greater degree of MEF via the increased fluorophore emission mechanism, and higher overall enhancement, as a result of its superior ability to undergo near-field interactions with AgNP. We foresee that this knowledge and methodology will be used to tailor MEF to meet the needs of different applications, such as those requiring maximum enhancement of fluorescence intensity or instead prioritizing excited-state photochemistry. </p>

Single Molecule Techniques Can Distinguish the Photophysical Processes Governing Metal-Enhanced Fluorescence

<p>Plasmonic metal nanoparticles can impact the behaviour of organic molecules in a number of ways, including enhancing or quenching fluorescence. Only through a comprehensive understanding of the fundamental photophysical processes regulating nano-molecular interactions can these effects be controlled, and exploited to the fullest extent possible. Metal-enhanced fluorescence (MEF) is governed by two underlying processes, increased rate of fluorophore excitation and increased fluorophore emission, the balance between which has implications for optimizing hybrid nanoparticle-molecular systems for various applications. We report groundbreaking work on the use of single molecule fluorescence microscopy to distinguish between the two mechanistic components of MEF, in a model system consisting of two analogous boron dipyrromethene (BODIPY) fluorophores and triangular silver nanoparticles (AgNP). We demonstrate that the increased excitation MEF mechanism occurs to approximately the same extent for both dyes, but that the BODIPY with the higher quantum yield of fluorescence experiences a greater degree of MEF via the increased fluorophore emission mechanism, and higher overall enhancement, as a result of its superior ability to undergo near-field interactions with AgNP. We foresee that this knowledge and methodology will be used to tailor MEF to meet the needs of different applications, such as those requiring maximum enhancement of fluorescence intensity or instead prioritizing excited-state photochemistry. </p>

Boundary work in response to professionals’ contextual constraints: Micro-strategies in interprofessional collaboration

Boundary-work research has extensively explored how professionals engage in boundary work to protect or expand their professional boundaries in interprofessional collaboration (IPC). Yet professionals’ contextual constraints in everyday work, such as time pressure or legal restrictions, often result in competing interests of the professionals involved in IPC, prompting them to engage in boundary work to limit—instead of protect or expand—their boundaries. Our empirical analysis uses comprehensive qualitative data on IPC in Germany between self-employed general practitioners (GPs) and registered nurses employed in nursing homes in which GPs’ efficiency interests compete with nurses’ safeguarding interests, leading both professionals to engage in boundary-work efforts to limit their boundaries. Our findings provide a comprehensive understanding and framework of professionals’ boundary work, showing that individual GPs and nurses typically hold a portfolio of various defending and accommodating micro-strategies. Based on our first-order findings, we identify how different sources of power enable particular micro-strategies and explore how the choice of micro-strategies depends on different forms of trust in the collaborating partner. Lastly, we outline interactions of micro-strategies, illustrating how the outcomes of professionals’ bilateral boundary work depend on the sequence of these strategies.

Diacylglyceryl-N,N,N-trimethylhomoserine-dependent lipid remodeling in a green alga, Chlorella kessleri

Membrane lipid remodeling contributes to the environmental acclimation of plants. In the green lineage, a betaine lipid, diacylglyceryl-N,N,N-trimethylhomoserine (DGTS), is included exclusively among green algae and nonflowering plants. Here, we show that the green alga Chlorella kessleri synthesizes DGTS under phosphorus-deficient conditions through the eukaryotic pathway via the ER. Simultaneously, phosphatidylcholine and phosphatidylethanolamine, which are similar to DGTS in their zwitterionic properties, are almost completely degraded to release 18.1% cellular phosphorus, and to provide diacylglycerol moieties for a part of DGTS synthesis. This lipid remodeling system that substitutes DGTS for extrachloroplast phospholipids to lower the P-quota operates through the expression induction of the BTA1 gene. Investigation of this lipid remodeling system is necessary in a wide range of lower green plants for a comprehensive understanding of their phosphorus deficiency acclimation strategies.

The dark and light sides of extra-tumor environment

The paradox in the pathobiological processes driving the incidence and progression across carcinomas unveil new opportunities for effective cancer treatment. The scattered evidence across the literature indicates that the insufficiencies/alterations in mesothelial cell migration, development, or function dramatically change the clinical disease course. We succinctly report in-general phenomena extensible across carcinomas predisposing to desmoplasia/reactive stroma, with due understanding of the limitations associated with such broader extrapolation. We further highlight the need for a comprehensive understanding of these purported pathways with an emphasis towards determining the tradeoffs between the risks associated with cancer susceptibility and disease progression.