Skylab: Cytogenetic studies of blood (experiment mill)

Preflight and postflight chromosomal analyses of space flight crews are presented. Special attention is given to findings suggestive of exposure to ionizing radiation. Information was obtained by study of persons receiving an external body source, such as, therapeutic dosage or those accidentally exposed. Others receiving radiation exposure from an internal source, such as the decay of radioisotopes administered for diagnosis or treatment, were also analyzed

Cytogenic studies of blood (experiment M111)

The Skylab M111 experiment was a continuation of the preflight and postflight chromosomal analyses of the flight crews that have been performed since the Gemini 3 mission. The experiment was designed to determine whether some space flight parameter produces cytogenetic effects in human cells and to provide biological radiation dosimetric capability in the event of significant radiation exposure to a flight crew. On each of the Skylab flights, blood lymphocytes for analysis of chromosomes for structural defects were obtained from each of the prime crewmembers and from a ground-based control group before and after flight. Two types of defects were recorded. The minor defects included the following aberrations: chromatid fragments, chromosome fragments, and deletions. Structural rearrangements such as dicentrics, exchanges, ring chromosomes, and translocations were photographed, and the cells were karyotyped to delineate, when possible, the chromosome or chromosomes involved in the rearrangement. Result seems to indicate that the flight itself was not a major contributing factor

Comparison of super-thick and conventional grain sorghum management systems

Call number: LD2668 .T4 1984 L624Master of Scienc

What Factors Influence Seat Belt Usage Rates in the United States?: A Meta-analysis

Problem: The traffic safety community is interested in reducing the number of lives lost and injuries due to automobile accidents. This can be done in two ways, through advancing automobile safety technology and by changing automobile driver behavior (Desai and You 1992). Seat belt laws are thought to be the behavioral solution because they have been proven to increase seat belt usage among automobile occupants. However, studies on the topic have varying answers when it comes to the degree to which these laws increase seat belt usage and factors which influence on seat belt uses. Research Questions: This study uses meta-analytic techniques to explore whether certain variables influence seat belt usage rates. The main research questions posed in this study are: What common independent variables are included in the studies of the impact of seat belt laws? Does the inclusion of certain variables affect the findings of the studies? In what direction do these variables influence the results of the study? The research hypothesis is that the inclusion of independent variables will have an effect on the influence of seat belt laws on seat belt use. Research Design: This study used a meta-analytic technique to pool data from five studies. A multiple regression was used to observe relationships between the dependent variable (percentage point increase in seat belt use) and independent variables such as race, gender, unit of interest, number of years included to the study, number of observations, year of publication and data source. A bivariate regression was used to further explore the relationships between the dependent and independent variables. Additionally, a qualitative review was conducted which included the seat belt law studies selected for inclusion in the meta-analysis. Findings: The multiple regression procedure using was not successful run due to the limited number of observations in this study. However, a bivariate regression analysis found correlations between percentage point increases in seat belt use and the primary seat belt law, secondary seat belt law, number of observation, unit of interest, and year published variables in a bivariate regression. Conclusion: This study did provide some insight into variables that influence seat belt rates however not many conclusions can be drawn from this study. Further research must be done to gain a better grasp of the factors that influence seat belt usage rates. Future meta-analytic studies on the seat belt laws and seat belt usage rates should include more studies and have broader set of criteria for the inclusion of studies and compare and contrast studies which examine studies that examine only primary or secondary laws

Two cases of fungal keratitis caused by Metarhizium anisopliae

We present two cases of keratitis due to Metarhizium anisopliae in geographically separated areas of the United States. The isolates were microscopically similar but morphologically different and were identified by ribosomal DNA sequencing. Both isolates had low minimum inhibitory concentration (MIC) values to caspofungin and micafungin, but high MIC values to amphotericin B. The morphologic and antifungal susceptibility differences between the two isolates indicate possible polyphylogeny of the group. Keywords: Metarhizium, Fungal keratitis, Keratomycosis, Antifungal susceptibilit

Only connect: addressing the emotional needs of Scotland's children and young people

A report on the SNAP (Scottish Needs Assessment Programme) Child and Adolescent Mental Health Phase Two survey. It describes a survey of a wide range of professionals working with children and young people in Scotland, and deals with professional perspectives on emotional, behavioural and psychological problems. Conclusions and recommendations are presented

Measurement of a Sign-Changing Two-Gap Superconducting Phase in Electron-Doped Ba(Fe_{1-x}Co_x)_2As_2 Single Crystals using Scanning Tunneling Spectroscopy

Scanning tunneling spectroscopic studies of $Ba(Fe_{1-x}Co_x)_2As_2$ (x = 0.06, 0.12) single crystals reveal direct evidence for predominantly two-gap superconductivity. These gaps decrease with increasing temperature and vanish above the superconducting transition $T_c$. The two-gap nature and the slightly doping- and energy-dependent quasiparticle scattering interferences near the wave-vectors $(\pm \pi, 0)$ and $(0, \pm \pi)$ are consistent with sign-changing $s$-wave superconductivity. The excess zero-bias conductance and the large gap-to-$T_c$ ratios suggest dominant unitary impurity scattering.Comment: 4 pages, 4 figures. Paper accepted for publication in Physical Review Letters. Contact author: Nai-Chang Yeh ([email protected]

Assessment of Slip Severity Among Different Age Groups

A laboratory study utilizing new techniques for assessing slip severity was conducted to investigate the process of inadvertent slips and falls among different age groups. Forty-two subjects from three age groups (young adults, middle-aged, and the elderly) walked on a rectangular track at a self-determined pace. Without the subjects’ awareness, a slippery floor surface was placed on the track over a force-measuring platform. The results indicated that elderly adults’ friction demand (RCOF) was not significantly different from the young and middle-aged adults. The older adults, however, fell more often than the other age groups. Fall recovery threshold (FRT) measures indicated that younger adults were able to recover from a slip (thus preventing a fall) with higher sliding speeds and longer slip distances than older adults. Additionally, older adults’ adjusted friction utilization (AFU) on the slippery floor surface was not adjusted within the dynamic friction requirements, resulting in more falls. Based on the age-related differences observed, it appears that fall-related accidents among older adults are due more to factors influencing compensation of a slip rather than gait characteristics influencing slip initiation