The Physical Processes of CME/ICME Evolution

As observed in Thomson-scattered white light, coronal mass ejections (CMEs) are manifest as large-scale expulsions of plasma magnetically driven from the corona in the most energetic eruptions from the Sun. It remains a tantalizing mystery as to how these erupting magnetic fields evolve to form the complex structures we observe in the solar wind at Earth. Here, we strive to provide a fresh perspective on the post-eruption and interplanetary evolution of CMEs, focusing on the physical processes that define the many complex interactions of the ejected plasma with its surroundings as it departs the corona and propagates through the heliosphere. We summarize the ways CMEs and their interplanetary CMEs (ICMEs) are rotated, reconfigured, deformed, deflected, decelerated and disguised during their journey through the solar wind. This study then leads to consideration of how structures originating in coronal eruptions can be connected to their far removed interplanetary counterparts. Given that ICMEs are the drivers of most geomagnetic storms (and the sole driver of extreme storms), this work provides a guide to the processes that must be considered in making space weather forecasts from remote observations of the corona.Peer reviewe

Parenting support in the context of poverty: a meta-synthesis of the qualitative evidence.

From the outset, providing support for parents has been a key feature of New Labour's policy agenda, but ‘good’ parenting, and child health and well-being are often undermined by the stresses associated with poverty. Moreover, there may be a gap between policy aims, and the perceptions and motivations of those intended to benefit. Drawing on a systematic review of qualitative studies of low-income parents, the present paper explores their experiences of informal and formal support networks, considering their strengths and weaknesses in the context of poverty. Traditional systematic review methods were used to locate and critically appraise 12 UK qualitative studies, which took as their focus parents’ subjective experiences of caring for children in impoverished circumstances. Meta-ethnographic methods were then used to produce a qualitative meta-synthesis of findings. Exploring the similarities and differences in parents’ accounts across studies identified positive and negative aspects of social support as a resource for poor parents. The review suggests that naturally occurring support systems do provide both material and emotional help to parents, but that such support has certain inherent drawbacks. It is not universally available and, in some circumstances, carries negative associations for poor families. Low-income lone mothers in particular enjoy smaller support networks, and are more reliant on mutual support than those in two-parent families. Paradoxically, it is the most socially isolated women who are least willing to seek professional help. Overall, low-income parents’ experiences of formal health and social welfare agencies are mixed, and not invariably positive. In conclusion, this paper suggests that formal support services have the potential to fill gaps in informal support systems for poor families, but only if these are provided in ways which are sensitive to their needs. Therefore, parents’ perspectives are essential to informing service design, development and evaluation in health and social care

Actin Filaments and Microtubules are Involved in Different Membrane Traffic Pathways That Transport Sphingolipids to the Apical Surface of Polarized HepG2 Cells

In polarized HepG2 hepatoma cells, sphingolipids are transported to the apical, bile canalicular membrane by two different transport routes, as revealed with fluorescently tagged sphingolipid analogs. One route involves direct, transcytosis-independent transport of Golgi-derived glucosylceramide and sphingomyelin, whereas the other involves basolateral to apical transcytosis of both sphingolipids. We show that these distinct routes display a different sensitivity toward nocodazole and cytochalasin D, implying a specific transport dependence on either microtubules or actin filaments, respectively. Thus, nocodazole strongly inhibited the direct route, whereas sphingolipid transport by transcytosis was hardly affected. Moreover, nocodazole blocked “hyperpolarization,” i.e., the enlargement of the apical membrane surface, which is induced by treating cells with dibutyryl-cAMP. By contrast, the transcytotic route but not the direct route was inhibited by cytochalasin D. The actin-dependent step during transcytotic lipid transport probably occurs at an early endocytic event at the basolateral plasma membrane, because total lipid uptake and fluid phase endocytosis of horseradish peroxidase from this membrane were inhibited by cytochalasin D as well. In summary, the results show that the two sphingolipid transport pathways to the apical membrane must have a different requirement for cytoskeletal elements