Training parents and educators on applied behaviour analysis (ABA). play-based, and speech-language interventions for students with Autism Spectrum Disorder (ASD)

This thesis explores the effectiveness of parent and educator-delivered interventions for school-age children with autism spectrum disorder (ASD). A literature review and two studies were conducted on data collected by the Secretaría de Educación y Cultura [Secretariat of Education and Culture] and Explora tu Potential A.C. [Explore your Potential A.C.] Project (SEC-ETP) to examine the outcomes of training and interventions for students diagnosed with ASD enrolled in public schools across the state of Sonora, Mexico, as well as their parents and educators. The first study aimed to assess the impact of parent and educator training on instructional self-efficacy, perceptions of a working alliance, and support provided by SEC. Results showed significant improvements in scores for instructional self-efficacy for parents and educators from in-person and teleconference training cohorts. However, there was a significant increase in scores related to play-related interventions for the teleconference parent cohort, but not the in-person cohort. The second study aimed to examine the effectiveness of parent-delivered interventions in the home setting and the parent and student outcomes. Results showed no significant improvements in ASD severity scores between pre and post-intervention periods. However, there were some notable relationships between measures of frequency of intervention and number of specific acquired skills. This thesis highlights the need for further research on parent and educator-delivered interventions for school-age children with ASD. The findings suggest that naturalistic development-based interventions (NDBIs) or ABA-based interventions complemented by NDBIs may be more appropriate in home and school settings and that there is a need for more robust support via training of parents and educators for interventions to effectively take place. Additionally, more research is needed to understand the limitations of these interventions and the potential biases that may have affected the results of the studies. The author's personal and professional investment in the development and implementation of the interventions, as well as in the publication of this work as a doctoral thesis, could have contributed to confirmation bias and affected the stakeholders' willingness to adhere to the intervention models and present the project in a positive light. It is important to carefully consider and address these conflicts of interest to ensure the reliability and credibility of the research findings

Exit, Voice, and Entrepreneurship: The Impact of Identity Concerns on Underrepresented Minorities

Despite organizations’ growing concerns over the recruitment and retention of underrepresented minorities in the United States, not enough is known about the conditions that lead underrepresented minority professionals to exit organizations and become entrepreneurs. Through an intersectionality lens and using a phenomenological methodology to form descriptive themes, this study seeks to further explore the experiences of minority professionals in organizations. Specifically, the focus of the study is to understand the conditions prompting underrepresented minorities to become entrepreneurs and either straddle or exit when launching their ventures. Although underrepresented minorities launching their own businesses is not a new phenomenon, the idea that there may be specific drivers within their organizational environment that move them in this direction that may be different from the non-minority population could add to our understanding of what causes them to choose entrepreneurship over employment at another organization. Employing qualitative fieldwork, the study utilized in-depth interviews with 30 underrepresented minority entrepreneurs to understand their experiences. These interviews included individuals who have exited by leaving the organization and launching their own businesses and those who straddled (stayed) while launching their businesses. Examining the experiences of the participants through a lens of intersectionality sheds light on the ways that overlapping identities interact in the face of power and oppression. This study considers the intersecting identities of gender, race, class, and age as well as their relationships with power structures within organizations as reported by underrepresented minorities. It also sheds light on why some individuals choose exit over voice and provides insights about the interactions of identity, power, and organizational structures in management and organization studies. The study finds that underrepresented minorities continue to face negative identity-based experiences within organizations due to the power structures that reinforce and support oppression

The brattleboro rat displays a natural deficit in social discrimination that is restored by clozapine and a neurotensin analog.

Cognitive deficits in schizophrenia are a major source of dysfunction for which more effective treatments are needed. The vasopressin-deficient Brattleboro (BRAT) rat has been shown to have several natural schizophrenia-like deficits, including impairments in prepulse inhibition and memory. We investigated BRAT rats and their parental strain, Long-Evans (LE) rats, in a social discrimination paradigm, which is an ethologically relevant animal test of cognitive deficits of schizophrenia based upon the natural preference of animals to investigate conspecifics. We also investigated the effects of the atypical antipsychotic, clozapine, and the putative antipsychotic, PD149163, a brain-penetrating neurotensin-1 agonist, on social discrimination in these rats. Adult rats were administered saline or one of the three doses of clozapine (0.1, 1.0, or 10 mg/kg) or PD149163 (0.1, 0.3, or 1.0 mg/kg), subcutaneously. Following drug administration, adult rats were exposed to a juvenile rat for a 4-min learning period. Animals were then housed individually for 30 min and then simultaneously exposed to the juvenile presented previously and a new juvenile for 4 min. Saline-treated LE rats, but not BRAT rats, exhibited intact social discrimination as evidenced by greater time spent exploring the new juvenile. The highest dose of clozapine and the two highest doses of PD149163 restored social discrimination in BRAT rats. These results provide further support for the utility of the BRAT rat as a genetic animal model relevant to schizophrenia and drug discovery. The potential of neurotensin agonists as putative treatments for cognitive deficits of schizophrenia was also supported

The dissimilar chemical composition of the planet-hosting stars of the XO-2 binary system

Using high-quality spectra of the twin stars in the XO-2 binary system, we have detected significant differences in the chemical composition of their photospheres. The differences correlate strongly with the elements' dust condensation temperature. In XO-2N, volatiles are enhanced by about 0.015 dex and refractories are overabundant by up to 0.090 dex. On average, our error bar in relative abundance is 0.012 dex. We present an early metal-depletion scenario in which the formation of the gas giant planets known to exist around these stars is responsible for a 0.015 dex offset in the abundances of all elements while 20 M_Earth of non-detected rocky objects that formed around XO-2S explain the additional refractory-element difference. An alternative explanation involves the late accretion of at least 20 M_Earth of planet-like material by XO-2N, allegedly as a result of the migration of the hot Jupiter detected around that star. Dust cleansing by a nearby hot star as well as age or Galactic birthplace effects can be ruled out as valid explanations for this phenomenon.Comment: ApJ, in press. Complete linelist (Table 3) available in the "Other formats -> Source" downloa

Reflexivity: a concept and its meanings for practitioners working with children and families

Reflexivity is a concept that is increasingly gaining currency in professional practice literature, particularly in relation to working with uncertainty and as an important feature of professional discretion and ethical practice. This article discusses how practitioners working in child and family welfare/protection organisations understood and interpreted the concept of reflexivity for their practice, as one of the outcomes of larger, collaborative research project. This project was conducted through a series of workshops with practitioners. The overall research that aimed to expand practitioners&rsquo; practice repertoires from narrowly-defined risk assessment, to an approach that could account for the uncertainties of practice, included the concept of reflexivity as an alternative or a complement to instrumental accountability that is increasingly a feature in child welfare/protection organisations. This article discusses how the concept of reflexivity was explored in the research and how practitioners interpreted the concept for their practice. We conclude that while concepts like reflexivity are central to formal theories for professional practice, we also recognise that individual practitioners interpret concepts (in ways that are both practically and contextually relevant), thus creating practical meanings appropriate to their practice contexts.<br /

The solar, exoplanet and cosmological lithium problems

We review three Li problems. First, the Li problem in the Sun, for which some previous studies have argued that it may be Li-poor compared to other Suns. Second, we discuss the Li problem in planet hosting stars, which are claimed to be Li-poor when compared to field stars. Third, we discuss the cosmological Li problem, i.e. the discrepancy between the Li abundance in metal-poor stars (Spite plateau stars) and the predictions from standard Big Bang Nucleosynthesis. In all three cases we find that the "problems" are naturally explained by non-standard mixing in stars.Comment: Astrophysics and Space Science, in press. New version has one reference correcte

The detailed chemical composition of the terrestrial planet host Kepler-10

Chemical abundance studies of the Sun and solar twins have demonstrated that the solar composition of refractory elements is depleted when compared to volatile elements, which could be due to the formation of terrestrial planets. In order to further examine this scenario, we conducted a line-by-line differential chemical abundance analysis of the terrestrial planet host Kepler-10 and fourteen of its stellar twins. Stellar parameters and elemental abundances of Kepler-10 and its stellar twins were obtained with very high precision using a strictly differential analysis of high quality CFHT, HET and Magellan spectra. When compared to the majority of thick disc twins, Kepler-10 shows a depletion in the refractory elements relative to the volatile elements, which could be due to the formation of terrestrial planets in the Kepler-10 system. The average abundance pattern corresponds to ~ 13 Earth masses, while the two known planets in Kepler-10 system have a combined ~ 20 Earth masses. For two of the eight thick disc twins, however, no depletion patterns are found. Although our results demonstrate that several factors (e.g., planet signature, stellar age, stellar birth location and Galactic chemical evolution) could lead to or affect abundance trends with condensation temperature, we find that the trends give further support for the planetary signature hypothesis.Comment: 12 pages, 11 figures, accepted for publication in MNRA

Quasar Feedback in the Ultraluminous Infrared Galaxy F11119+3257: Connecting the Accretion Disk Wind with the Large-Scale Molecular Outflow

In Tombesi et al. (2015), we reported the first direct evidence for a quasar accretion disk wind driving a massive molecular outflow. The target was F11119+3257, an ultraluminous infrared galaxy (ULIRG) with unambiguous type-1 quasar optical broad emission lines. The energetics of the accretion disk wind and molecular outflow were found to be consistent with the predictions of quasar feedback models where the molecular outflow is driven by a hot energy-conserving bubble inflated by the inner quasar accretion disk wind. However, this conclusion was uncertain because the energetics were estimated from the optically thick OH 119 um transition profile observed with Herschel. Here, we independently confirm the presence of the molecular outflow in F11119+3257, based on the detection of broad wings in the CO(1-0) profile derived from ALMA observations. The broad CO(1-0) line emission appears to be spatially extended on a scale of at least ~7 kpc from the center. Mass outflow rate, momentum flux, and mechanical power of (80-200) R_7^{-1} M_sun/yr, (1.5-3.0) R_7^{-1} L_AGN/c, and (0.15-0.40)% R_7^{-1} L_AGN are inferred from these data, assuming a CO-to-H_2 conversion factor appropriate for a ULIRG (R_7 is the radius of the outflow normalized to 7 kpc and L_AGN is the AGN luminosity). These rates are time-averaged over a flow time scale of 7x10^6 yrs. They are similar to the OH-based rates time-averaged over a flow time scale of 4x10^5 yrs, but about a factor 4 smaller than the local ("instantaneous"; <10^5 yrs) OH-based estimates cited in Tombesi et al. The implications of these new results are discussed in the context of time-variable quasar-mode feedback and galaxy evolution. The need for an energy-conserving bubble to explain the molecular outflow is also re-examined.Comment: 15 pages, 6 figures, 4 tables, accepted for publication in Ap

HIV, sexual risk and ethnicity among gay and bisexual men in England: survey evidence for persisting health inequalities.

To examine ethnic group differences in HIV testing and sexual behaviours among a large sample of gay and bisexual men (GBM), 13 years after similar observations were made, assess national HIV prevention responses and inform planning priorities. Cross-sectional convenience self-completion online survey in summer 2014, designed and recruited in collaboration with community-based health promoters and gay internet services; comparison with earlier findings reporting on similarly designed survey in 2001. We recruited 15 388 GBM living in England who self-reported as follows: 18.5% from ethnic minorities; 9.0% tested HIV positive (cf. 17.0% and 5.4% in 2001). Compared with the white British, Asian men were no longer less likely to report diagnosed HIV but had an equal probability of doing so (2001 OR=0.32, 95% CI 0.13 to 0.79; 2014 OR=1.04, 95% CI 0.71 to 1.54); black men remained significantly more likely to report diagnosed HIV (2001 OR=2.06, 95% CI 1.56 to 3.29; 2014 OR=1.62, 95% CI 1.10 to 2.36) as did men in the other white group (2001 OR=1.54, 95% CI 1.23 to 1.93; 2014 OR=1.31, 95% CI 1.10 to 1.55). Overall annual incidence of reported HIV diagnoses in 2014 was 1.1%. Black men were significantly more likely to report diagnosis with HIV in the last 12 months than the white British (adjusted odds ratios (AOR) 2.57, 95% CI 1.22 to 5.39). No minority ethnic group was more or less likely to report condom unprotected anal intercourse (CUAI) in the last year but men in the Asian, black and all others groups were more likely than the white British to report CUAI with more than one non-steady partners. Among GBM in England, HIV prevalence continues to be higher among black men and other white men compared with the white British. The protective effect of being from an Asian background appears no longer to pertain. Sexual risk behaviours may account for some of these differences