6,752 research outputs found

    Ethics at the End of Life: A Teaching Tool

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    Social workers rarely receive education and training in the areas of grief, bereavement, and death and dying, which may lead to difficulties in compassionately and ethically addressing concerns in end-of-life or grief-related contexts. This article presents actual and potential outcomes from three challenging end-of-life case studies using Mattison’s ethical decision-making model as a framework. The case studies were drawn from student interviews with experienced master’s-level social workers. This pedagogical article helps to promote self-reflection and consideration of ethical issues in grief and death-related situations as well as supplement death education and ethics curricula to include end-of-life content

    Exhaust All Measures: Ethical Issues in Pediatric End-of-Life Care

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    The death of a child may have a profound impact on parents, family members, and health care providers who provided care for the child. Unique challenges are faced by parents of seriously ill children as they must serve as the legal authority for health care decisions of children under age 18, although the child’s wishes must also be considered. Social workers must balance core social work values, bioethical values, and psychosocial issues presented by such situations. While studies have been conducted with physicians and nurses regarding ethical issues in pediatric end-of-life care settings, little is known about how social workers experience these conflicts. This article utilizes two vignettes to illustrate potential ethical issues in this setting and applies the National Association of Social Workers Standards for Palliative and End of Life Care (NASW, Citation2004) to explore options for their resolution. These vignettes provide descriptions of possible reactions in this setting and can be used as a basis for further exploration of ethics in pediatric end-of-life care from a social work perspective

    Small and mighty: adaptation of superphylum Patescibacteria to groundwater environment drives their genome simplicity.

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    BackgroundThe newly defined superphylum Patescibacteria such as Parcubacteria (OD1) and Microgenomates (OP11) has been found to be prevalent in groundwater, sediment, lake, and other aquifer environments. Recently increasing attention has been paid to this diverse superphylum including > 20 candidate phyla (a large part of the candidate phylum radiation, CPR) because it refreshed our view of the tree of life. However, adaptive traits contributing to its prevalence are still not well known.ResultsHere, we investigated the genomic features and metabolic pathways of Patescibacteria in groundwater through genome-resolved metagenomics analysis of > 600 Gbp sequence data. We observed that, while the members of Patescibacteria have reduced genomes (~ 1 Mbp) exclusively, functions essential to growth and reproduction such as genetic information processing were retained. Surprisingly, they have sharply reduced redundant and nonessential functions, including specific metabolic activities and stress response systems. The Patescibacteria have ultra-small cells and simplified membrane structures, including flagellar assembly, transporters, and two-component systems. Despite the lack of CRISPR viral defense, the bacteria may evade predation through deletion of common membrane phage receptors and other alternative strategies, which may explain the low representation of prophage proteins in their genomes and lack of CRISPR. By establishing the linkages between bacterial features and the groundwater environmental conditions, our results provide important insights into the functions and evolution of this CPR group.ConclusionsWe found that Patescibacteria has streamlined many functions while acquiring advantages such as avoiding phage invasion, to adapt to the groundwater environment. The unique features of small genome size, ultra-small cell size, and lacking CRISPR of this large lineage are bringing new understandings on life of Bacteria. Our results provide important insights into the mechanisms for adaptation of the superphylum in the groundwater environments, and demonstrate a case where less is more, and small is mighty

    Local and Global Well-Posedness for Aggregation Equations and Patlak-Keller-Segel Models with Degenerate Diffusion

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    Recently, there has been a wide interest in the study of aggregation equations and Patlak-Keller-Segel (PKS) models for chemotaxis with degenerate diffusion. The focus of this paper is the unification and generalization of the well-posedness theory of these models. We prove local well-posedness on bounded domains for dimensions d≥2d\geq 2 and in all of space for d≥3d\geq 3, the uniqueness being a result previously not known for PKS with degenerate diffusion. We generalize the notion of criticality for PKS and show that subcritical problems are globally well-posed. For a fairly general class of problems, we prove the existence of a critical mass which sharply divides the possibility of finite time blow up and global existence. Moreover, we compute the critical mass for fully general problems and show that solutions with smaller mass exists globally. For a class of supercritical problems we prove finite time blow up is possible for initial data of arbitrary mass.Comment: 31 page

    α-Conotoxin Vc1.1 inhibits human dorsal root ganglion neuroexcitability and mouse colonic nociception via GABA\u3csub\u3eB\u3c/sub\u3e receptors

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    Objective α-Conotoxin Vc1.1 is a small disulfidebonded peptide from the venom of the marine cone snail Conus victoriae. Vc1.1 has antinociceptive actions in animal models of neuropathic pain, but its applicability to inhibiting human dorsal root ganglion (DRG) neuroexcitability and reducing chronic visceral pain (CVP) is unknown. Design We determined the inhibitory actions of Vc1.1 on human DRG neurons and on mouse colonic sensory afferents in healthy and chronic visceral hypersensitivity (CVH) states. In mice, visceral nociception was assessed by neuronal activation within the spinal cord in response to noxious colorectal distension (CRD). Quantitativereverse- transcription-PCR, single-cell-reversetranscription- PCR and immunohistochemistry determined ?-aminobutyric acid receptor B (GABABR) and voltagegated calcium channel (CaV2.2, CaV2.3) expression in human and mouse DRG neurons. Results Vc1.1 reduced the excitability of human DRG neurons, whereas a synthetic Vc1.1 analogue that is inactive at GABABR did not. Human DRG neurons expressed GABABR and its downstream effector channels CaV2.2 and CaV2.3. Mouse colonic DRG neurons exhibited high GABABR, CaV2.2 and CaV2.3 expression, with upregulation of the CaV2.2 exon-37a variant during CVH. Vc1.1 inhibited mouse colonic afferents ex vivo and nociceptive signalling of noxious CRD into the spinal cord in vivo, with greatest efficacy observed during CVH. A selective GABABR antagonist prevented Vc1.1-induced inhibition, whereas blocking both CaV2.2 and CaV2.3 caused inhibition comparable with Vc1.1 alone. Conclusions Vc1.1-mediated activation of GABABR is a novel mechanism for reducing the excitability of human DRG neurons. Vc1.1-induced activation of GABABR on the peripheral endings of colonic afferents reduces nociceptive signalling. The enhanced antinociceptive actions of Vc1.1 during CVH suggest it is a novel candidate for the treatment for CVP
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