2,208 research outputs found

    The results of resistance improvement in Eger

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    The Effects of Athletic Participation on Self-Concept, Daily School Attendance, and Grade Point Average of Female Seventh-Grade Students in Urban Schools

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    This study examined the effects of athletic participation on self-concept, daily school attendance, and grade point average on 503 seventh grade students in urban middle schools. A 2 x 3 factorial MANOVA analyzed self-concept data to determine differences in self-concept associated with the levels of athletic participation with that of pre- and post-treatment test periods. Tukey\u27s post hoc tests were incorporated when a significant F ratio was demonstrated (p\u3c 0.05). Significant differences were noted in four areas of self-concept as defined by Piers-Harris (1984): (1) intellectual and school status (Tukey, p\u3c 0.05), (2) physical appearance and attributes (Tukey, p\u3c 0.05), (3) anxiety (Tukey, p\u3c 0.05), and (4) popularity (Tukey, p\u3c 0.05). No significant differences were noted in three areas of self-concept: (1) behavior, (2) happiness and satisfaction, and (3) self-concept total. A 3 x 3 factorial ANOVA demonstrated statistical differences in daily school attendance between female students participating in interscholastic athletics with female students not participating in interscholastic athletics. Daily school attendance reports were collected to coincide with three grading periods. Tukey\u27s post hoc tests were incorporated when a significant F ratio was demonstrated (Tukey, p\u3c 0.05). Students not participating in interscholastic athletics noted higher absenteeism than students who participated in interscholastic athletics (Tukey, p\u3c 0.05). A 3 x 3 factorial ANOVA demonstrated statistical differences in grade point averages between female students participating in interscholastic athletics with those female students not participating in interscholastic athletics. Grade point averages of the two-sport participants were significantly higher than the one-sport participants (Tukey, p\u3c 0.05). Grade point averages of the one-sport participants were significantly higher than the no-sport participants (Tukey, p\u3c 0.05). Results suggest positive effects of athletic participation on self-concept, daily school attendance, and grade point average of female seventh grade students in urban middle schools participating in interscholastic sports programs

    Molecular Spiders in One Dimension

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    Molecular spiders are synthetic bio-molecular systems which have "legs" made of short single-stranded segments of DNA. Spiders move on a surface covered with single-stranded DNA segments complementary to legs. Different mappings are established between various models of spiders and simple exclusion processes. For spiders with simple gait and varying number of legs we compute the diffusion coefficient; when the hopping is biased we also compute their velocity.Comment: 14 pages, 2 figure

    Bayesian approach to cyclic activity of CF Oct

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    Bayesian statistical methods of Gregory-Loredo and the Bretthorst generalization of the Lomb-Scargle periodogram have been applied for studying activity cycles of the early K-type subgiant star CF Oct. We have used a ~45 year long dataset derived from archival photographic observations, published photoelectric photometry, Hipparcos data series and All Sky Automated Survey archive. We have confirmed the already known rotational period for the star of 20.16 d and have shown evidences that it has exhibited changes from 19.90 d to 20.45 d. This is an indication for stellar surface differential rotation.The Bayesian magnitude and time--residual analysis reveals clearly at least one long-term cycle. The cycle lenght's posterior distributions appear to be multimodal with a pronounced peak at a period of 7.1 y with FWHM of 54 d for time-residuals and at a period of 9.8 y with FWHM of 184 d for magitude data. These results are consistent with the previously postulated cycle of 9+/-3 years.Comment: The paper contains 6 figures and 3 tables. Accepted for publication in Monthly Notices of the Royal Astronomical Society Main Journa

    Liquid methanol Monte Carlo simulations with a refined potential which includes polarizability, nonadditivity, and intramolecular relaxation

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    Monte Carlo simulations of liquid methanol were performed using a refined ab initio derived potential which includes polarizability, nonadditivity, and intramolecular relaxation. The results present good agreement between the energetic and structural properties predicted by the model and those predicted by ab initio calculations of methanol clusters and experimental values of gas and condensed phases. The molecular level picture of methanol shows the existence of both rings and linear polymers in the methanol liquid phase

    Increased White Matter Inflammation in Aging- and Alzheimer's Disease Brain

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    Chronic neuroinflammation, which is primarily mediated by microglia, plays an essential role in aging and neurodegeneration. It is still unclear whether this microglia-induced neuroinflammation occurs globally or is confined to distinct brain regions. In this study, we investigated microglia activity in various brain regions upon healthy aging and Alzheimer's disease (AD)-related pathology in both human and mouse samples. In purified microglia isolated from aging mouse brains, we found a profound gene expression pattern related to pro-inflammatory processes, phagocytosis, and lipid homeostasis. Particularly in white matter microglia of 24-month-old mice, abundant expression of phagocytic markers including Mac-2, Axl, CD16/32, Dectin1, CD11c, and CD36 was detected. Interestingly, in white matter of human brain tissue the first signs of inflammatory activity were already detected during middle age. Thus quantification of microglial proteins, such as CD68 (commonly associated with phagocytosis) and HLA-DR (associated with antigen presentation), in postmortem human white matter brain tissue showed an age-dependent increase in immunoreactivity already in middle-aged people (53.2 +/- 2.0 years). This early inflammation was also detectable by non-invasive positron emission tomography imaging using [C-11]-(R)-PK11195, a ligand that binds to activated microglia. Increased microglia activity was also prominently present in the white matter of human postmortem early-onset AD (EOAD) brain tissue. Interestingly, microglia activity in the white matter of late-onset AD (LOAD) CNS was similar to that of the aged clinically silent AD cases. These data indicate that microglia-induced neuroinflammation is predominant in the white matter of aging mice and humans as well as in EOAD brains. This white matter inflammation may contribute to the progression of neurodegeneration, and have prognostic value for detecting the onset and progression of aging and neurodegeneration
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