Swimming Efficiency of Bacterium Escherichia Coli

We use in vivo measurements of swimming bacteria in an optical trap to determine fundamental properties of bacterial propulsion. In particular, we determine the propulsion matrix, which relates the angular velocity of the flagellum to the torques and forces propelling the bacterium. From the propulsion matrix dynamical properties such as forces, torques, swimming speed and power can be obtained from measurements of the angular velocity of the motor. We find significant heterogeneities among different individuals even though all bacteria started from a single colony. The propulsive efficiency, defined as the ratio of the propulsive power output to the rotary power input provided by the motors, is found to be 0.2%.Comment: 6 page

Assessment of dietary intakes, nutritional risk and whole grain behaviors of community-residing adults age 60+ years

Older adults (OA) are not meeting MyPlate recommendations. Tailored lifestyle intervention programs have the potential to improve nutrition-related knowledge and dietary behaviors. Study 1 assessed the nutritional risk and dietary intake frequencies (DIF) of community-residing OA electing to participate in lifestyle intervention programs and sociodemographic characteristics influencing these behaviors. It was a cross-sectional study consisting of participants from three states who completed the Dietary Screening Tool (DST). Study 2 evaluated to what extent a three-week whole grain (WG) education program is able to impact WG behaviors. The program incorporated discussion, hands-on activities and taste-testing among OA. Participants were assigned to PowerPoint classes (n=13 sites) or discussion-based classes (n=12 sites). The DST and a non-validated WG questionnaire were completed pre and post. Study 1 participants (n=352) were mostly college-educated, white females, age 60-70 years classified as at nutritional risk or at possible nutritional risk. Participants had low DIF of dairy, lean protein and processed meat. Participants also had moderate DIF of added fats, sugars and sweets, total and WG, vegetables and whole fruit and juice. Whole fruit and juice DIF were influenced by state (p≤.001). Vegetable DIF were influenced by state (p=.021) and gender (p=.022). Processed meat DIF were influenced by gender (p=.033) and age (p=.001). Finally, nutritional risk was influenced by gender (p=.006). Study 2 participants (n=157) were mostly white, high-income females. Significant increases in WG knowledge were observed (p≤.001). DST total grain and WG DIF increased (p≤.001), with a positive correlation between post WG knowledge and DST WG DIF (p=.027). At post, more participants reported liking the taste of WG foods (p=0.019) and knew how to use a product\u27s package to determine WG content (p≤.001). About 59.2% had a strong intention to eat more WG foods at post. A positive association between post intention to eat more WG foods and DST WG DIF was observed (p≤.001). Furthermore, WG knowledge was higher among those in the PowerPoint-based classes (p=0.002). These findings suggest community-residing OA are at nutritional risk. Additionally, a WG education program may be an effective strategy for increasing WG knowledge and encouraging improvements in WG intake among OA

The role of body rotation in bacterial flagellar bundling

In bacterial chemotaxis, E. coli cells drift up chemical gradients by a series of runs and tumbles. Runs are periods of directed swimming, and tumbles are abrupt changes in swimming direction. Near the beginning of each run, the rotating helical flagellar filaments which propel the cell form a bundle. Using resistive-force theory, we show that the counter-rotation of the cell body necessary for torque balance is sufficient to wrap the filaments into a bundle, even in the absence of the swirling flows produced by each individual filament

Sequential Online Wellness Programming Is an Effective Strategy to Promote Behavior Change

The growing number of United States youth and adults categorized as overweight or obese illustrates a need for research-based family wellness interventions. Sequential, online, Extension-delivered family wellness interventions offer a time- and cost-effective approach for both participants and Extension educators. The 6-week, online Healthy Families Challenge (HFC) resulted in increased daily fruit and vegetable servings and leisure-time physical activity. These findings suggest that an Extension-delivered, sequential, online family wellness program is an effective education strategy

Whole Grains

Including whole grains in your diet provides many health benefits, including reducing your risk for diabetes, heart disease and certain cancers. The information in this publication will help you understand your whole grain choices so you can select and enjoy a variety of healthy foods.https://lib.dr.iastate.edu/extension_families_pubs/1000/thumbnail.jp

Twirling Elastica: Kinks, Viscous Drag, and Torsional Stress

Biological filaments such as DNA or bacterial flagella are typically curved in their natural states. To elucidate the interplay of viscous drag, twisting, and bending in the overdamped dynamics of such filaments, we compute the steady-state torsional stress and shape of a rotating rod with a kink. Drag deforms the rod, ultimately extending or folding it depending on the kink angle. For certain kink angles and kink locations, both states are possible at high rotation rates. The agreement between our macroscopic experiments and the theory is good, with no adjustable parameters.Comment: 4 pages, 4 figure

Film support and the challenge of ‘sustainability’: on wing design, wax and feathers, and bolts from the blue

In recognition of the importance of film in generating both economic and cultural value, the UK Labour government set up a new agency – the United Kingdom Film Council (UKFC) – in 2000 with a remit to build a sustainable film industry. But, reflecting a plethora of differing expectations in relation to the purposes behind public support for film, the UKFC's agenda shifted and broadened over the organisation's lifetime (2000–11). Apparently unconvinced by the UKFC's achievements, the Coalition government which came to power in May 2010 announced the Council's abolition and reassigned its responsibilities as part of a general cost-cutting strategy. Based on original empirical research, this article examines how the UKFC's sense of strategic direction was determined, how and why the balance of objectives it pursued changed over time and what these shifts tell us about the nature of film policy and the challenges facing bodies that are charged with enacting it in the twenty-first century

Statistical methods for multivariate meta-analysis of diagnostic tests: An overview and tutorial

In this article, we present an overview and tutorial of statistical methods for meta-analysis of diagnostic tests under two scenarios: 1) when the reference test can be considered a gold standard; and 2) when the reference test cannot be considered a gold standard. In the first scenario, we first review the conventional summary receiver operating characteristics (ROC) approach and a bivariate approach using linear mixed models (BLMM). Both approaches require direct calculations of study-specific sensitivities and specificities. We next discuss the hierarchical summary ROC curve approach for jointly modeling positivity criteria and accuracy parameters, and the bivariate generalized linear mixed models (GLMM) for jointly modeling sensitivities and specificities. We further discuss the trivariate GLMM for jointly modeling prevalence, sensitivities and specificities, which allows us to assess the correlations among the three parameters. These approaches are based on the exact binomial distribution and thus do not require an ad hoc continuity correction. Last, we discuss a latent class random effects model for meta-analysis of diagnostic tests when the reference test itself is imperfect for the second scenario. A number of case studies with detailed annotated SAS code in procedures MIXED and NLMIXED are presented to facilitate the implementation of these approaches

Spectroscopy 19 (2005) 207-212 207 IOS Press Clinical NIRS of the urinary bladder - A demonstration case report

Abstract. Urinary incontinence is a common affliction among people of all ages throughout the world. There are many causes of incontinence, treatment options are determined by the cause, and current diagnostic methods require urodynamic assessment, which involves urethral and rectal catheterization, which are uncomfortable and distasteful for patients. Since clinical near infrared spectrophotometry (NIRS) is a non-invasive, rapid means of measuring tissue oxygenation status at the bedside, we examined whether NIRS could be useful as a diagnostic tool for bladder dysfunction. An adult patient attending an incontinence clinic for routine urodynamic testing also had NIRS data collection during the standard bladder filling regimen. NIRS optodes were placed on the skin of the intact abdomen over the supra pubic region. Changes in oxy and de-oxy hemoglobin concentration and changes in cytochrome c oxidase net redox status via NIRS were collected at 6 Hz. The magnitudes of change that occurred during NIRS data collection are on the order of 0.5 µmol/l and the moments of change correspond to the subject's reported sensations of bladder filling and emptying, and with conventional urodynamics. These observations suggest that NIRS may be a disruptive technology with a role to play in non-invasive evaluation of bladder dysfunction in humans

Disappeared persons and homicide in El Salvador

During 2012–2013, the homicide rate in El Salvador came down from 69.9 to 42.2 per 100,000 population following a government brokered truce between the leaders of the two major gangs, Mara Salvatrucha and Barrio 18. But despite the apparent successes of the truce, it was speculated that the drop in murders could have been due to the killers simply hid the bodies of their victims. This paper aims at determining whether gangs effectively disappeared their victims to cut down the official counts of murders, or they committed these crimes for other reasons. The results from this study suggest that Salvadoran gangs had been using disappearance as a method to gain sustained social control among residents of already gang-dominated areas, that together with homicide, disappearance is part of a process of territorial spread and strategic strengthening by which these groups are enhancing their capabilities to interfere in the alliances of Mexican drug trafficking organizations with Central American criminal organizations specializing in the trans-shipment of drugs and in providing access to local markets to distribute and sell drugs. Our findings show that the risk for disappearance has been large even before the truce was in place and that actually, it continues as such and going through a process of geographic expansion