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"Dietrich, S"
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The drug company next door : pollution, jobs, and community health in Puerto Rico
\"This fascinating and most timely critical medical anthropology study successfully binds two still emergent areas of contemporary anthropological research in the global world: the nature and significant impact of multinational pharmaceutical manufacturers on human social life everywhere, and the contribution of corporations to the fast-paced degradation of our life support system, planet Earth. Focusing on a pharmaceutically-impacted town on the colonized island of Puerto Rico, Dietrich ably demonstrates the value of ethnography carried out in small places in framing the large issues facing humanity.\" --Merrill Singer, University of Connecticut The production of pharmaceuticals is among the most profitable industries on the planet. Drug companies produce chemical substances that can save, extend, or substantially improve the quality of human life.However, even as the companies present themselves publicly as health and environmental stewards, their factories are a significant source of air and water pollution--toxic to people and the environment. In Puerto Rico, the pharmaceutical industry is the backbone of the island's economy: in one small town alone, there are over a dozen drug factories representing five multinationals, the highest concentration per capita of such factories in the world. It is a place where the enforcement of environmental regulations and the public trust they ensure are often violated in the name of economic development. The Drug Company Next Door unites the concerns of critical medical anthropology with those of political ecology, investigating the multi-faceted role of pharmaceutical corporations as polluters, economic providers, and social actors.Rather than simply demonizing the drug companies, the volume explores the dynamics involved in their interactions with the local community and discusses the strategies used by both individuals and community groups to deal with the consequences of pollution. The Drug Company Next Door puts a human face on a growing set of problems for communities around the world.Accessible and engaging, the book encourages readers to think critically about the role of corporations in everyday life, health, and culture. Alexa S. Dietrich is Assistant Professor of Anthropology at Wagner College. \"-- Provided by publisher.
Book
Chronic wounds treated with cold atmospheric plasmajet versus best practice wound dressings: a multicenter, randomized, non-inferiority trial
The use of phase-adapted wound dressings represents best practice (BP) in chronic wound treatment. However, efficacy is often limited and associated care requirements are high. Cold atmospheric plasmajet (CAP-jet) is a promising new therapeutic tool for these wounds. In the present multicenter, randomized, open-label, prospective, clinical trial, non-inferiority of the CAP-jet versus BP was assessed in 78 patients with infected or non-infected chronic wounds of different etiology. Primary outcome measure was the sum of granulation tissue, furthermore wound area reduction, healing rate, time to complete healing, changes in wound pH value, infection score, exudate level and local tolerability were assessed. In CAP-jet treated wounds compared to control, the sum of granulation tissue was significantly higher (p < 0.0001) and wound area reduced significantly faster (p < 0.001). Furthermore, wound pH value decreased significantly faster (p = 0.0123) and local infection was overcome more rapidly by CAP-jet therapy. In 58.97% CAP-jet- vs. 5.13% BP-treated patients, complete healing of chronic ulcers was documented after 6 weeks. Treatment with CAP-jet appeared not only non-inferior, but even superior to BP in all wound entities analyzed with a favorable tolerability profile. Thus, treatment with the CAP-jet provides beneficial effects in chronic wound treatment regarding promotion of the wound healing process.
Journal Article
Nanoalignment by critical Casimir torques
The manipulation of microscopic objects requires precise and controllable forces and torques. Recent advances have led to the use of critical Casimir forces as a powerful tool, which can be finely tuned through the temperature of the environment and the chemical properties of the involved objects. For example, these forces have been used to self-organize ensembles of particles and to counteract stiction caused by Casimir-Liftshitz forces. However, until now, the potential of critical Casimir torques has been largely unexplored. Here, we demonstrate that critical Casimir torques can efficiently control the alignment of microscopic objects on nanopatterned substrates. We show experimentally and corroborate with theoretical calculations and Monte Carlo simulations that circular patterns on a substrate can stabilize the position and orientation of microscopic disks. By making the patterns elliptical, such microdisks can be subject to a torque which flips them upright while simultaneously allowing for more accurate control of the microdisk position. More complex patterns can selectively trap 2D-chiral particles and generate particle motion similar to non-equilibrium Brownian ratchets. These findings provide new opportunities for nanotechnological applications requiring precise positioning and orientation of microscopic objects.
Recent advances in manipulating microscopic objects involve utilizing critical Casimir forces, controllable via temperature and chemical properties. By demonstrating the efficiency of critical Casimir torques, the authors enable precise alignment of microscopic objects on nanopatterned substrates.
Journal Article
Unisexual and Heterosexual Meiotic Reproduction Generate Aneuploidy and Phenotypic Diversity De Novo in the Yeast Cryptococcus neoformans
Aneuploidy is known to be deleterious and underlies several common human diseases, including cancer and genetic disorders such as trisomy 21 in Down's syndrome. In contrast, aneuploidy can also be advantageous and in fungi confers antifungal drug resistance and enables rapid adaptive evolution. We report here that sexual reproduction generates phenotypic and genotypic diversity in the human pathogenic yeast Cryptococcus neoformans, which is globally distributed and commonly infects individuals with compromised immunity, such as HIV/AIDS patients, causing life-threatening meningoencephalitis. C. neoformans has a defined a-α opposite sexual cycle; however, >99% of isolates are of the α mating type. Interestingly, α cells can undergo α-α unisexual reproduction, even involving genotypically identical cells. A central question is: Why would cells mate with themselves given that sex is costly and typically serves to admix preexisting genetic diversity from genetically divergent parents? In this study, we demonstrate that α-α unisexual reproduction frequently generates phenotypic diversity, and the majority of these variant progeny are aneuploid. Aneuploidy is responsible for the observed phenotypic changes, as chromosome loss restoring euploidy results in a wild-type phenotype. Other genetic changes, including diploidization, chromosome length polymorphisms, SNPs, and indels, were also generated. Phenotypic/genotypic changes were not observed following asexual mitotic reproduction. Aneuploidy was also detected in progeny from a-α opposite-sex congenic mating; thus, both homothallic and heterothallic sexual reproduction can generate phenotypic diversity de novo. Our study suggests that the ability to undergo unisexual reproduction may be an evolutionary strategy for eukaryotic microbial pathogens, enabling de novo genotypic and phenotypic plasticity and facilitating rapid adaptation to novel environments.
Journal Article
Interface-mediated spontaneous symmetry breaking and mutual communication between drops containing chemically active particles
Symmetry breaking and the emergence of self-organized patterns is the hallmark of complexity. Here, we demonstrate that a sessile drop, containing titania powder particles with negligible self-propulsion, exhibits a transition to collective motion leading to self-organized flow patterns. This phenomenology emerges through a novel mechanism involving the interplay between the chemical activity of the photocatalytic particles, which induces Marangoni stresses at the liquid–liquid interface, and the geometrical confinement provided by the drop. The response of the interface to the chemical activity of the particles is the source of a significantly amplified hydrodynamic flow within the drop, which moves the particles. Furthermore, in ensembles of such active drops long-ranged ordering of the flow patterns within the drops is observed. We show that the ordering is dictated by a chemical communication between drops, i.e., an alignment of the flow patterns is induced by the gradients of the chemicals emanating from the active particles, rather than by hydrodynamic interactions.
Complex systems exhibit unique properties like spontaneous symmetry breaking and self-organization. Singh et al. show that catalytically active, non-propelling particles can induce steady vortical flows within a drop, as well as flow alignment between neighboring drops.
Journal Article
Direct measurement of critical Casimir forces
When fluctuating fields are confined between two surfaces, long-range forces arise. A famous example is the quantum-electrodynamical Casimir force that results from zero-point vacuum fluctuations confined between two conducting metal plates
1
. A thermodynamic analogue is the critical Casimir force: it acts between surfaces immersed in a binary liquid mixture close to its critical point and arises from the confinement of concentration fluctuations within the thin film of fluid separating the surfaces
2
. So far, all experimental evidence for the existence of this effect has been indirect
3
,
4
,
5
. Here we report the direct measurement of critical Casimir force between a single colloidal sphere and a flat silica surface immersed in a mixture of water and 2,6-lutidine near its critical point. We use total internal reflection microscopy to determine
in situ
the forces between the sphere and the surface, with femtonewton resolution
6
. Depending on whether the adsorption preferences of the sphere and the surface for water and 2,6-lutidine are identical or opposite, we measure attractive and repulsive forces, respectively, that agree quantitatively with theoretical predictions and exhibit exquisite dependence on the temperature of the system. We expect that these features of critical Casimir forces may result in novel uses of colloids as model systems.
Journal Article
Obese adults have visual attention bias for food cue images: evidence for altered reward system function
Background: The major aim of this study was to investigate whether the motivational salience of food cues (as reflected by their attention-grabbing properties) differs between obese and normal-weight subjects in a manner consistent with altered reward system function in obesity. Methodology/Principal Findings: A total of 18 obese and 18 normal-weight, otherwise healthy, adult women between the ages of 18 and 35 participated in an eye-tracking paradigm in combination with a visual probe task. Eye movements and reaction time to food and non-food images were recorded during both fasted and fed conditions in a counterbalanced design. Eating behavior and hunger level were assessed by self-report measures. Obese individuals had higher scores than normal-weight individuals on self-report measures of responsiveness to external food cues and vulnerability to disruptions in control of eating behavior. Both obese and normal-weight individuals demonstrated increased gaze duration for food compared to non-food images in the fasted condition. In the fed condition, however, despite reduced hunger in both groups, obese individuals maintained the increased attention to food images, whereas normal-weight individuals had similar gaze duration for food and non-food images. Additionally, obese individuals had preferential orienting toward food images at the onset of each image. Obese and normal-weight individuals did not differ in reaction time measures in the fasted or fed condition. Conclusions/Significance: Food cue incentive salience is elevated equally in normal-weight and obese individuals during fasting. Obese individuals retain incentive salience for food cues despite feeding and decreased self-report of hunger. Sensitization to food cues in the environment and their dysregulation in obese individuals may play a role in the development and/or maintenance of obesity.
Journal Article
The development of the sustainability measure for healthcare using a modified Delphi process
Background
Valid and reliable measures for assessing the sustainability of complex, multicomponent, and interdisciplinary healthcare interventions are lacking. The study objective was to develop a multidimensional instrument for use to assess the sustainability of complex, interdisciplinary, healthcare interventions implemented in acute care settings.
Methods
Content experts participated in a modified Delphi study of electronic REDCap
®
measures. Round 1, composed of 49 structured and unstructured questions, was analyzed using descriptive statistics and content analysis. In rounds 2 and 3, experts rated items derived from round 1 to provide evidence of sustainability on a 5-point Likert-type scale. Questions rated by > 75% of the experts as important were retained for the final measure.
Results
Ten experts representing areas of quality improvement, sustainability, and implementation science participated in rounds 1 and 8 experts in rounds 2 and 3, respectively. Round 1 statements with a median value of < = 6 on the 10-point Likert scale or < = 3 on the 4- or 5-point Likert scale were retained. The items retained, modified, and added in Round 2 included 53 items. Questions rated by > 75% of the experts as important were retained for the final measurement; conversely, questions rated by ≤ 25% of the experts as important were discarded. Twenty-five items with associated %s expert ratings of “important” (between 25% and 75% from Round 2) were included in Round 3. The modified Delphi process resulted in a final 37-item scale.
Conclusions
Using a modified Delphi technique, experts reported varying perceptions of sustainability. However, commonalities in key areas were successfully translated into the Sustainability Measure for Healthcare for assessing the sustainability of complex, multicomponent interventions.
Journal Article