140 research outputs found

    Chronic Stress in Relation to Locus of Control

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    Stress is prominent in everyone’s lives, and if the right precautions are not taken, stress can become chronic and harmful to an individual’s health (Schmitz, Neumann, & Oppermann, 2000). To prevent chronic stress, researchers seek to find out important factors that lead to chronic stress. One of the most prominent factors leading to chronic stress is locus of control (LOC), or how much control people feel they have over situations (Cummins, 1988). People can endorse an internal locus of control which means individual attributes events occurring in their life to their own behavior, or an external, which one would consider an outside force responsible for an event that occurred in their life (Bollini, Walker, Hamann, & Kestler, 2004). There are mixed results in the literature regarding different forms of stress and locus of control. Some results indicate that external locus of control is related to higher stress levels (Schmitz et al. 2000), some results indicate that a more internal locus of control is related to higher stress (Cummins, 1988), while others found no significant relationship (Bollini et al. 2004). For this experiment, researchers wanted to examine the relationship between type of locus of control and amount of chronic stress. It was predicted that greater external locus of control would be associated with increased chronic stress. In the present study, UMSL students (n=81) completed the Life Stressors Checklist to measure amount of stress exposure, as well as the Locus of Control Scale to measure if participants had more internal or external locus of control. We found that LOC was not correlated with levels of chronic stress (F(1,79)=0.049, p\u3e0.05). Although a significant relationship was not found, it is still important that individuals learn to manage stress, because stress presents itself similarly, no matter which perception of control an individual possesses (Bollini et al. 2004)

    Stress, Resilience, and Impulsivity

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    Stress is a phenomenon that everyone will experience. Stress that is unmanageable can become chronic, which is linked to various negative psychological effects (Le Fevre, Matheny, & Kolt, 2003). Although stress research often focuses on the negative long-term effects, there are times where individuals develop a trait known as resilience. Resilient individuals eventually learn how to buffer the negative effects of stress (Cicchetti, 2010), and researchers have begun investigating the positive effects of resilience on stress (Cicchetti, 2010; Kermott, Johnson, Sood, R., Jenkins, & Sood, A., 2019). Currently, few studies have been conducted to identify any additional traits that may impact the relationship between stress and resilience. However, there is some evidence that impulsivity may be a prevalent trait that affects the dynamic between stress and resilience. Typically, stressed individuals exhibit higher levels of impulsivity (Moustafa, Tindle, Frydecka, & Misiak, 2017). In turn, this may affect one’s level of resilience. The present study aims to focus on the relationship between stress (current and chronic) and resilience, as well as the moderating effect of impulsivity on that relationship. It was predicted that there would be a relationship between stress and resilience and that impulsivity would have a moderating effect on the relationship. UMSL students (n=81) completed various questionnaires to determine their stress, resilience, and impulsivity levels. We found that chronic stress was not a significant predictor of resilience (R2 = .52, F(1,79) = .40, p \u3e .05), but that current stress was a significant predictor (R2= .15, F(1,79) = 13.4, p \u3c .001). For this presentation, we decided to only run one moderation with the significant results. We found that impulsivity was not a significant moderator between current stress and resilience (B = -.02, p \u3e .05). Although we did not find a significant relationship within the moderation, there is still some value in investigating traits that influence stress and resilience. Understanding potential factors that may impact resilience may help researchers identify appropriate methods for increasing resilience in vulnerable populations

    Deciphering the ovarian proteomic impacts of obesity

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    The ovary is the female reproductive organ responsible for the production of both the female gamete, the oocyte, and two major female sex hormones, estradiol and progesterone. During embryonic development, oocytes are formed from primordial germ cells and eventually become surrounded by squamous granulosa cells in a follicular structure, termed primordial. The oocyte numbers encased in primordial follicles are finite at birth and remain arrested in the diplotene stage of meiosis until ovulation or they degenerate through atresia. Once the pool of primordial follicles is depleted, ovarian senescence occurs. We hypothesized that the maternal metabolic changes that occur during lean gestational diabetes mellitus would impact offspring ovarian function both basally and in response to a dietary stressor later in life. We observed impacts on follicle numbers and alterations in the ovarian proteome, suggesting possible impacts on fertility and oocyte quality in relation to in utero and metabolic stressors. Additionally, we hypothesized that the ovarian DNA damage response is altered during obesity in adulthood. An elevated response in markers of DNA damage was observed, indicating that the metabolic status of the ovary during obesity initiates a low-level DNA damage response. Intercellular communication is also affected by a metabolic syndrome such as obesity or GDM exposure, with reduction of the gap junction protein Connexin-43 expression in antral follicles from ovaries that experienced obesity. Finally, to elucidate the molecular mechanisms behind the induction of the DNA damage response in the ovary after phosphoramide mustard exposure, we hypothesized that the DNA damage response would be blunted due to reduced abundance of the ATM protein. Using an Atm+/- mouse model to investigate impacts on folliculogenesis and the ovarian proteome, we determined that Atm haploinsufficiency results in an irregular DNA damage response, alters the ovarian proteome, and impacts the rate of follicle loss after phosphoramide mustard exposure. Taken together, these findings demonstrate that the DNA damage response is initiated in the ovary during times of metabolic stress and in the absence of Atm, unhealthy follicles remain in the ovary, potentially contributing to poor oocyte quality or infertility

    Developmental Origins of Ovarian Disorder: Impact of Maternal Lean Gestational Diabetes on the Offspring Ovarian Proteome in Mice

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    Gestational diabetes mellitus (GDM) is an obstetric disorder affecting approximately 10% of pregnancies. The 4HFHS (High Fat High Sucrose) mouse model emulates GDM in lean women. Dams are fed a HFHS diet one week prior to mating and throughout gestation resulting in inadequate insulin response to glucose in mid-late pregnancy. The offspring of HFHS dams have increased adiposity, thus, we hypothesized that maternal metabolic alterations during lean GDM would compromise ovarian function in offspring both basally and in response to a control or HFHS diet in adulthood. Briefly, DLPL were lean dams and control diet pups; DLPH were lean dams and HFHS pups; DHPL were HFHS dams and control diet pups and DHPH were HFHS dams and HFHS pups. A HFHS challenge in the absence of maternal GDM (DLPL vs. DLPH) increased 3 and decreased 30 ovarian proteins. Maternal GDM in the absence of a dietary stress (DLPL vs. DHPL) increased abundance of 4 proteins and decreased abundance of 85 proteins in the offspring ovary. Finally, 87 proteins increased, and 4 proteins decreased in offspring ovaries due to dietary challenge and exposure to maternal GDM in utero (DLPL vs. DHPH). Canopy FGF signaling regulator 2 (CNPY2), Deleted in azoospermia-associated protein 1 (DAZAP1), Septin 7 (SEPT7), and Serine/arginine rich splicing factor 2 (SRSF2) were altered across multiple offspring groups. Together, these findings suggest a possible impact on fertility and oocyte quality in relation to GDM exposure in utero as well as in response to a western diet in later life

    System Fitness of Grazeable Forages for Large Herds in Automatic Milking Systems

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    Automatic milking rotary (AMR) systems have the capacity to milk 800 cows. To maintain a pasture-based system whereby \u3e 50% of the total diet is pasture (Garcia and Fulkerson, 2005), large herds milked by AMR will be required to walk significant distances. Walking distances of greater than 1-km are associated with an increased incidence of undesirably long milking intervals and reduced milk yield (Lyons N, unpubl. data). The aim of this study was to investigate the total land area required and associated walking distance for large automatic milking system (AMS) herds when incorporating complementary forage rotations (CFR; Garcia et al., 2008) into the system

    Teaching for Black and Brown Lives: The Importance of Ethnic Studies Curriculum in the Education Success of Black and Latinx Students

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    This study identifies school policies and practices that create a gap in support for Ethnic Studies for high school graduation, college graduation, and teacher licensures. The first method was interviewing specific stakeholders through zoom who were in the position for the purpose of the research. The interviewed participants answered questions about the policies related to Ethnic studies, practice school policies, and implications of the ratification of Ethnic study policies in Nevada. The second method was analyzing Nevada state and Department of Education policies relating to teacher education. Interpreting how UNLV teacher licensure programs apply those policies in the preparation curriculum. Results from the methods were initial findings were 75% of the student population in CCSD are students of color, but there are still limited clubs that surround racialized experiences. Although students who participated in racial/ethnic club activities led to more enrollment in elective courses. Ethnic studies are considered along with social studies and “diversity studies”, which need to be differentiated from one another. Ethnic study courses can be a valuable enhancement to build cross-racial solidarity and create opportunities to make sense of school experiences. It is critical to make a foundation for success for Students of Color and Families of color in many schools and communities in CCSD.https://digitalscholarship.unlv.edu/durep_lightning/1003/thumbnail.jp

    Grazing Behaviour of Dairy Cows When Grazing Forage Rape in a Pasture-Based Automatic Milking System

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    Forage rape (Brassica napus L.) is a high producing, high nutritive value forage that has been successfully introduced as a grazable forage in conventional, intensified pasture-based dairy systems to fill autumn-winter feed gaps (Garcia et al. 2008). However, incorporation of forage rape as a grazing forage option for automatic milking systems (AMS), in which cows enter and exit grazing areas voluntarily, has not been investigated yet. We conducted an observational study to investigate the suitability of using forage rape in AMS and gain understanding of cow’s foraging behaviour when grazing this forage. The outcomes of this piece of work will help to determine management guidelines regarding incorporation of the crop into voluntary cow traffic systems
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