235 research outputs found

    Sixty years of Sverdrup : a retrospective of progress in the study of phytoplankton blooms

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    Author Posting. © The Oceanography Society, 2014. This article is posted here by permission of The Oceanography Society for personal use, not for redistribution. The definitive version was published in Oceanography 27, no. 1 (2014): 222–235, doi:10.5670/oceanog.2014.26.One of the most dramatic large-scale features in the ocean is the seasonal greening of the North Atlantic in spring and summer due to the accumulation of phytoplankton biomass in the surface layer. In 1953, Harald Ulrik Sverdrup hypothesized a now canonical mechanism for the development and timing of phytoplankton blooms in the North Atlantic. Over the next 60 years, Sverdrup's Critical Depth Hypothesis spurred progress in understanding of bloom dynamics and offered a valuable theoretical framework on which to build. In reviewing 60 years of literature, the authors trace the development of modern bloom initiation hypotheses, highlighting three case studies that illuminate the complexity, including both catalysts and impediments, of scientific progress in the wake of Sverdrup's hypothesis. Most notably, these cases demonstrate that the evolution of our understanding of phytoplankton blooms was paced by access not only to technology but also to concurrent insights from several disciplines. This exploration of the trajectories and successes in bloom studies highlights the need for expanding interdisciplinary collaborations to address the complexity of phytoplankton bloom dynamics

    Pattern Specification and Immune Response Transcriptional Signatures of Pericardial and Subcutaneous Adipose Tissue

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    Cardiovascular disease (CVD) remains the leading cause of morbidity and mortality in the United States. Recent studies suggest that pericardial adipose tissue (PCAT) secretes inflammatory factors that contribute to the development of CVD. To better characterize the role of PCAT in the pathogenesis of disease, we performed a large-scale unbiased analysis of the transcriptional differences between PCAT and subcutaneous adipose tissue, analysing 53 microarrays across 19 individuals. As it was unknown whether PCAT-secreted factors are produced by adipocytes or cells in the supporting stromal fraction, we also sought to identify differentially expressed genes in isolated pericardial adipocytes vs. isolated subcutaneous adipocytes. Using microarray analysis, we found that: 1) pericardial adipose tissue and isolated pericardial adipocytes both overexpress atherosclerosis-promoting chemokines and 2) pericardial and subcutaneous fat depots, as well as isolated pericardial adipocytes and subcutaneous adipocytes, express specific patterns of homeobox genes. In contrast, a core set of lipid processing genes showed no significant overlap with differentially expressed transcripts. These depot-specific homeobox signatures and transcriptional profiles strongly suggest different functional roles for the pericardial and subcutaneous adipose depots. Further characterization of these inter-depot differences should be a research priority

    The effects of brain death and ischemia on tolerance induction are organ‐specific

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    Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/143776/1/ajt14674_am.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/143776/2/ajt14674.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/143776/3/ajt14674-sup-0001-FigS1-S2.pd

    Increasing condom use in heterosexual men: development of a theory-based interactive digital intervention

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    Increasing condom use to prevent sexually transmitted infections is a key public health goal. Interventions are more likely to be effective if they are theory- and evidence-based. The Behaviour Change Wheel (BCW) provides a framework for intervention development. To provide an example of how the BCW was used to develop an intervention to increase condom use in heterosexual men (the MenSS website), the steps of the BCW intervention development process were followed, incorporating evidence from the research literature and views of experts and the target population. Capability (e.g. knowledge) and motivation (e.g. beliefs about pleasure) were identified as important targets of the intervention. We devised ways to address each intervention target, including selecting interactive features and behaviour change techniques. The BCW provides a useful framework for integrating sources of evidence to inform intervention content and deciding which influences on behaviour to target

    Искусственная вентиляция легких у пациентов с морбидным ожирением при лапароскопических операциях в положении Тренделенбурга (обзор литературы)

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       The literature review is devoted to the peculiarities of artificial lung ventilation (ALV) in patients with morbid obesity during laparoscopic oncosurgical interventions in the Trendelenburg position. At present, there are no consensus recommendations on the choice of the optimal ALV mode during anesthesia in this area of oncosurgery. When analyzing data obtained from other types of operations, there was no impression that there were significant advantages of any ALV modes, both with volume and pressure control. However, high values of positive end-expiratory pressure (PEEP) have the most evidence of benefit in this category of patients, and the inversion of the duration of the respiratory cycle phases without creating a high PEEP can help reduce the risk of lung damage when all other ALV techniques do not allow for adequate oxygenation.   Обзор литературы посвящен особенностям проведения искусственной вентиляции легких (ИВЛ) у пациентов с морбидным ожирением при лапароскопических онкохирургических вмешательствах в положении Тренделенбурга. В настоящее время согласительные рекомендации по выбору оптимального режима ИВЛ при проведении анестезии в этой области онкохирургии отсутствуют. При анализе данных, полученных при других видах операций, не сложилось впечатления о наличии значимых преимуществ каких-либо режимов ИВЛ – как с управлением по объему, так и по давлению. Тем не менее больше всего доказательств в отношении пользы применения у такой категории больных имеют высокие значения положительного давления в конце выдоха (ПДКВ), инверсия продолжительности фаз дыхательного цикла без создания высокого ПДКВ может способствовать снижению риска повреждения легких в условиях, когда все остальные методики ИВЛ не позволяют добиться адкеватной оксигенации

    Elucidating the Role of the Complement Control Protein in Monkeypox Pathogenicity

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    Monkeypox virus (MPXV) causes a smallpox-like disease in humans. Clinical and epidemiological studies provide evidence of pathogenicity differences between two geographically distinct monkeypox virus clades: the West African and Congo Basin. Genomic analysis of strains from both clades identified a ∼10 kbp deletion in the less virulent West African isolates sequenced to date. One absent open reading frame encodes the monkeypox virus homologue of the complement control protein (CCP). This modulatory protein prevents the initiation of both the classical and alternative pathways of complement activation. In monkeypox virus, CCP, also known as MOPICE, is a ∼24 kDa secretory protein with sequence homology to this superfamily of proteins. Here we investigate CCP expression and its role in monkeypox virulence and pathogenesis. CCP was incorporated into the West African strain and removed from the Congo Basin strain by homologous recombination. CCP expression phenotypes were confirmed for both wild type and recombinant monkeypox viruses and CCP activity was confirmed using a C4b binding assay. To characterize the disease, prairie dogs were intranasally infected and disease progression was monitored for 30 days. Removal of CCP from the Congo Basin strain reduced monkeypox disease morbidity and mortality, but did not significantly decrease viral load. The inclusion of CCP in the West African strain produced changes in disease manifestation, but had no apparent effect on disease-associated mortality. This study identifies CCP as an important immuno-modulatory protein in monkeypox pathogenesis but not solely responsible for the increased virulence seen within the Congo Basin clade of monkeypox virus
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