245 research outputs found

    “You’re kind of considered like a leper”: A Narrative Inquiry Into How The Significant Academic Struggle of Academic Probation Impacts Women Undergraduate Science Students’ Sense of Belonging at an Institution

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    While there has been significant research on both how academic struggles impact college students, as well as factors that impact the sense of belonging for college students, there has been little research examining how a significant academic struggle impacts a students’ perception of sense of belonging at that institution. This qualitative study explores how an academic struggle impacts students’ sense of belonging at that institution, as well as other findings from this study

    The small FNR regulon of Neisseria gonorrhoeae: comparison with the larger Escherichia coli FNR regulon and interaction with the NarQ-NarP regulon

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    BACKGROUND: Neisseria gonorrhoeae can survive during oxygen starvation by reducing nitrite to nitrous oxide catalysed by the nitrite and nitric oxide reductases, AniA and NorB. The oxygen-sensing transcription factor, FNR, is essential for transcription activation at the aniA promoter, and full activation also requires the two-component regulatory system, NarQ-NarP, and the presence of nitrite. The only other gene known to be activated by the gonococcal FNR is ccp encoding a cytochrome c peroxidase, and no FNR-repressed genes have been reported in the gonococcus. In contrast, FNR acts as both an activator and repressor involved in the control of more than 100 operons in E. coli regulating major changes in the adaptation from aerobic to anaerobic conditions. In this study we have performed a microarray-led investigation of the FNR-mediated responses in N. gonorrhoeae to determine the physiological similarities and differences in the role of FNR in cellular regulation in this species. RESULTS: Microarray experiments show that N. gonorrhoeae FNR controls a much smaller regulon than its E. coli counterpart; it activates transcription of aniA and thirteen other genes, and represses transcription of six genes that include dnrN and norB. Having previously shown that a single amino acid substitution is sufficient to enable the gonococcal FNR to complement an E. coli fnr mutation, we investigated whether the gonococcal NarQ-NarP can substitute for E. coli NarX-NarL or NarQ-NarP. A plasmid expressing gonococcal narQ-narP was unable to complement E. coli narQP or narXL mutants, and was insensitive to nitrate or nitrite. Mutations that progressively changed the periplasmic nitrate sensing region, the P box, of E. coli NarQ to the sequence of the corresponding region of gonococcal NarQ resulted in loss of transcription activation in response to the availability of either nitrate or nitrite. However, the previously reported ligand-insensitive ability of gonococcal NarQ, the "locked on" phenotype, to activate either E. coli NarL or NarP was confirmed. CONCLUSION: Despite the sequence similarities between transcription activators of E. coli and N. gonorrhoeae, these results emphasise the fundamental differences in transcription regulation between these two types of pathogenic bacteria

    The Miseducation of Welfare Reform: Denying the Promise of Postsecondary Education

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    When Congress enacted “welfare reform” in 1996, decades of progress in assisting low-income mothers obtain a college education in order to escape poverty was nearly eradicated. The federal welfare reform law strongly discouraged states from incorporating postsecondary education into their welfare reform programs and focused instead on “work-first” policies. As a direct result, hundreds of thousands of low-income mothers across the country were forced to drop out of college and find jobs in order to comply with strict “work-first” welfare rules. Despite the pressure imposed by the federal law, the State of Maine persevered in its effort to make college a reality for low-income mothers. Advocates in Maine were adamant that welfare reform policies focus on raising families out of poverty and endeavor to change the position of women in the labor market in order to relieve poverty for low-income single mothers. These farsighted views, embodied in the Maine Parents as Scholars program, have paid off for welfare recipients and for the state, with dividends. As the welfare reform law expires, Congress has the opportunity to reverse course and support states in providing access to postsecondary education for welfare recipients. In this paper, we will reveal how “work-first” ideology pushed the merits of postsecondary education for low-income women to the background despite the well-known, intimate relationship between higher education and women\u27s earnings, employment, and well-being. We will highlight the innovative approach taken in Maine to overcome the pressures of the federal welfare reform law and report on positive outcomes for Maine welfare recipients who were able to access higher education despite federal restrictions. Finally, we will explore the current Congressional proposals for renewing the welfare reform law in a manner more conducive to allowing low-income mothers access to education

    Three Interventions for Financial Therapy: Fostering an Examination of Financial Behaviors and Beliefs

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    Three interventions that address the emotional components of handling finances are proposed. Drawn from a stepwise model of financial therapy, the three interventions introduced here have the specific aim of incorporating the emotional attributes of traditional financial behaviors and beliefs. First, the Financial Genogram identifies family of origin issues that may affect financial behaviors; second, the Financial Landscape intervention is used when emotional stress occurs in collecting and examining financial documents; and third, the Financial Mirror broadens clients’ perspectives of their financial behaviors. Issues in future research and implementation of the Five Step model are addressed in treating financially distressed clients

    A Multinomial Model of Event-Based ProspectiveMemory

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    Improving Student Performance Through Loss Aversion

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    Framing an outcome as a loss causes individuals to expend extra effort to avoid that outcome (Tversky & Kahneman, 1991). Since classroom performance is a function of student effort in search of a higher grade, we seek to use loss aversion to encourage student effort. This field quasi-experiment endows students with all of the points in the course upfront, then deducts points for each error throughout the semester. Exploiting two course sequences in the business school of a Midwestern university, a control for domain-specific knowledge, this study examines the impact of loss aversion when controlling for the student’s knowledge in a specific subject. This quasi-experiment indicates that students perform three to four percentage points better when controlling for student ability and domain knowledge (148 subjects). This result is significant at the 1% level in our most robust specification (p = 0.0020). This result is confirmed by a specification including four courses and controlling for student characteristics (217 subjects, p = 0.0190)

    The potential health impact of restricting less-healthy food and beverage advertising on UK television between 05.30 and 21.00 hours: A modelling study

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    Funder: National Institute for Health Research; funder-id: http://dx.doi.org/10.13039/501100000272Funder: British AcademyBackground: Restrictions on the advertising of less-healthy foods and beverages is seen as one measure to tackle childhood obesity and is under active consideration by the UK government. Whilst evidence increasingly links this advertising to excess calorie intake, understanding of the potential impact of advertising restrictions on population health is limited. Methods and findings: We used a proportional multi-state life table model to estimate the health impact of prohibiting the advertising of food and beverages high in fat, sugar, and salt (HFSS) from 05.30 hours to 21.00 hours (5:30 AM to 9:00 PM) on television in the UK. We used the following data to parameterise the model: children’s exposure to HFSS advertising from AC Nielsen and Broadcasters’ Audience Research Board (2015); effect of less-healthy food advertising on acute caloric intake in children from a published meta-analysis; population numbers and all-cause mortality rates from the Human Mortality Database for the UK (2015); body mass index distribution from the Health Survey for England (2016); disability weights for estimating disability-adjusted life years (DALYs) from the Global Burden of Disease Study; and healthcare costs from NHS England programme budgeting data. The main outcome measures were change in the percentage of the children (aged 5–17 years) with obesity defined using the International Obesity Task Force cut-points, and change in health status (DALYs). Monte Carlo analyses was used to estimate 95% uncertainty intervals (UIs). We estimate that if all HFSS advertising between 05.30 hours and 21.00 hours was withdrawn, UK children (n = 13,729,000), would see on average 1.5 fewer HFSS adverts per day and decrease caloric intake by 9.1 kcal (95% UI 0.5–17.7 kcal), which would reduce the number of children (aged 5–17 years) with obesity by 4.6% (95% UI 1.4%–9.5%) and with overweight (including obesity) by 3.6% (95% UI 1.1%–7.4%) This is equivalent to 40,000 (95% UI 12,000–81,000) fewer UK children with obesity, and 120,000 (95% UI 34,000–240,000) fewer with overweight. For children alive in 2015 (n = 13,729,000), this would avert 240,000 (95% UI 65,000–530,000) DALYs across their lifetime (i.e., followed from 2015 through to death), and result in a health-related net monetary benefit of £7.4 billion (95% UI £2.0 billion–£16 billion) to society. Under a scenario where all HFSS advertising is displaced to after 21.00 hours, rather than withdrawn, we estimate that the benefits would be reduced by around two-thirds. This is a modelling study and subject to uncertainty; we cannot fully and accurately account for all of the factors that would affect the impact of this policy if implemented. Whilst randomised trials show that children exposed to less-healthy food advertising consume more calories, there is uncertainty about the nature of the dose–response relationship between HFSS advertising and calorie intake. Conclusions: Our results show that HFSS television advertising restrictions between 05.30 hours and 21.00 hours in the UK could make a meaningful contribution to reducing childhood obesity. We estimate that the impact on childhood obesity of this policy may be reduced by around two-thirds if adverts are displaced to after 21.00 hours rather than being withdrawn

    Synapse-Specific Control of Experience-Dependent Plasticity by Presynaptic NMDA Receptors

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    Sensory experience orchestrates the development of cortical circuitry by adaptively modifying neuro-transmission and synaptic connectivity. However, the mechanisms underlying these experience-dependent modifications remain elusive. Here we demonstrate that visual experience suppresses a presynaptic NMDA receptor (preNMDAR)-mediated form of timing-dependent long-term depression (tLTD) at visual cortex layer (L) 4-2/3 synapses. This tLTD can be maintained during development, or reinstated in adulthood, by sensory deprivation. The changes in tLTD are mirrored by changes in glutamate release; visual deprivation enhances both tLTD and glutamate release. These effects require the GluN3A NMDAR subunit, the levels of which are increased by visual deprivation. Further, by coupling the pathway-specific optogenetic induction of tLTD with cell-type-specific NMDAR deletion, we find that visual experience modifies preNMDAR-mediated plasticity specifically at L4-L2/3 synapses
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