The Prevalence of Lower Extremity Non-Contact Injuries in Athletic Populations in Relation to Measured Ankle Dorsiflexion

Context: Ankle dorsiflexion is the degree to which the dorsal aspect of the foot can be brought closer in relation to the shin. Restricted ankle dorsiflexion can cause altered biomechanics and loading patterns, which can lead to injury from over-compensation in movement patterns. Limited ankle dorsiflexion alters frontal and sagittal plane biomechanics and has been hypothesized to contribute to common lower extremity injuries. The weight-bearing lunge test is a simple clinical evaluation test that can measure the range of ankle dorsiflexion. Objective: The purpose of this study was to determine if there was a correlation between restricted range of motion with ankle dorsiflexion and lower extremity injuries. We hypothesized restricted range of motion at the ankle would lead to increased stress on other joints resulting in chronic stress injuries. Design: Cross-sectional study Setting: Athletic training clinic at a mid-west NAIA institution. Participants: One-hundred forty-eight college athletes (104 males and 44 females; age = 19.32 ± 1.21 years, height = 69.64 ± 4.89 inches, mass = 81.39 ± 18.57 kg) who were all fall sport athletes (football, N=70; women’s volleyball, N=17; men’s soccer, N=34 and women’s soccer, N=27) were the participants of this study. Some athletes were excluded from the study if they had suffered a lower extremity injury in the previous year. Main Outcome Measures: Ankle dorsiflexion range of motion measured using the weight-bearing lunge test; lower extremity noncontact injuries recorded via The Athletic Trainer System®. Results: Results were calculated using T-Tests via IBM SPSS® software. There was a total of 25 injured and 123 uninjured athletes. There was no statistical significance in ankle dorsiflexion between recorded injured and uninjured participants (p = 0.817). The average dorsiflexion for injured participants = 41.01° ± 6.28°. The average for uninjured = 41.85° ± 6.76°. Asymmetry between left and right ankle when compared to injured (2.1° ± 1.63°) vs. uninjured (2.49° ± 1.92°) was not significance (p = 0.290). Conclusion: There was no significant data to assume correlation or causation between restricted ankle dorsiflexion measured via the weight-bearing lunge test and increased risk of lower extremity noncontact injury. Lack of significance comparing asymmetry between left and right leg in both injured and uninjured groups provided further support for this conclusion

Black Box 2020

The Black Box is a student based creative publication serving the Embry-Riddle Prescott campus. It is our goal to provide a showcase for the creativity and talent of the Embry-Riddle students. Creative works by members of Embry-Riddle\u27s faculty and staff are included

A rotating white dwarf shows different compositions on its opposite faces

White dwarfs, the extremely dense remnants left behind by most stars after their death, are characterised by a mass comparable to that of the Sun compressed into the size of an Earth-like planet. In the resulting strong gravity, heavy elements sink toward the centre and the upper layer of the atmosphere contains only the lightest element present, usually hydrogen or helium. Several mechanisms compete with gravitational settling to change a white dwarf's surface composition as it cools, and the fraction of white dwarfs with helium atmospheres is known to increase by a factor ~2.5 below a temperature of about 30,000 K; therefore, some white dwarfs that appear to have hydrogen-dominated atmospheres above 30,000 K are bound to transition to be helium-dominated as they cool below it. Here we report observations of ZTF J203349.8+322901.1, a transitioning white dwarf with two faces: one side of its atmosphere is dominated by hydrogen and the other one by helium. This peculiar nature is likely caused by the presence of a small magnetic field, which creates an inhomogeneity in temperature, pressure or mixing strength over the surface. ZTF J203349.8+322901.1 might be the most extreme member of a class of magnetic, transitioning white dwarfs -- together with GD 323, a white dwarf that shows similar but much more subtle variations. This new class could help shed light on the physical mechanisms behind white dwarf spectral evolution.Comment: 45 pages, 11 figure

The Seventeenth Data Release of the Sloan Digital Sky Surveys: Complete Release of MaNGA, MaStar and APOGEE-2 Data

This paper documents the seventeenth data release (DR17) from the Sloan Digital Sky Surveys; the fifth and final release from the fourth phase (SDSS-IV). DR17 contains the complete release of the Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey, which reached its goal of surveying over 10,000 nearby galaxies. The complete release of the MaNGA Stellar Library (MaStar) accompanies this data, providing observations of almost 30,000 stars through the MaNGA instrument during bright time. DR17 also contains the complete release of the Apache Point Observatory Galactic Evolution Experiment 2 (APOGEE-2) survey which publicly releases infra-red spectra of over 650,000 stars. The main sample from the Extended Baryon Oscillation Spectroscopic Survey (eBOSS), as well as the sub-survey Time Domain Spectroscopic Survey (TDSS) data were fully released in DR16. New single-fiber optical spectroscopy released in DR17 is from the SPectroscipic IDentification of ERosita Survey (SPIDERS) sub-survey and the eBOSS-RM program. Along with the primary data sets, DR17 includes 25 new or updated Value Added Catalogs (VACs). This paper concludes the release of SDSS-IV survey data. SDSS continues into its fifth phase with observations already underway for the Milky Way Mapper (MWM), Local Volume Mapper (LVM) and Black Hole Mapper (BHM) surveys

Effectiveness of Prophylactic Fluconazole at Low Doses for Allogeneic Hematopoietic Stem Cell Transplant Patients

Class of 2016 AbstractObjectives: The purpose of this study was to evaluate if fluconazole 200 mg is an acceptable alternative to the fluconazole 400 mg for fungal prophylaxis in allogenic hematopoietic stem cell patients. Lower fluconazole doses will decrease cost of therapy and may reduce adverse events associated with higher doses. Methods: This study was a retrospective chart review conducted at the Arizona Cancer Center. A total of 58 patients qualified for the study. Primary endpoints were number of days on fluconazole 200 mg and type and number of fungal infections that occurred within 1 year post transplant. Results: Out of the fifty-eight patients who qualified for the study, only eight patients had a breakthrough fungal infection while on 200 mg (13.7%) after one year. Three of those eight were identified as having systemic fungal infections (5.2%). Conclusions: Fluconazole 200 mg is a reasonable low-cost and low side effect alternative to fluconazole 400 mg for antifungal prophylaxis in allogenic hematopoietic stem cell patients.This item is part of the Pharmacy Student Research Projects collection, made available by the College of Pharmacy and the University Libraries at the University of Arizona. For more information about items in this collection, please contact Jennifer Martin, Librarian and Clinical Instructor, Pharmacy Practice and Science, [email protected]

Assessment of Open-path Spectrometer Accuracy at Low Path-integrated Methane Concentrations

The accurate measurement of greenhouse gas emissions is a challenge for atmospheric science. Long-range open-path sensors are flexible enough to be applied to a variety of complex emission sources, and single devices are often used to measure both high and low path-integrated concentrations. As this technology develops, it is important to examine potential sources of inaccuracy. A GasFinder3 open-path laser was tested with a range of path-integrated concentrations from 11.7 to 182 ppm∙m CH4 using certified standard gases. The measured path-integrated concentrations had a positive bias which was higher than 10% at low path-integrated concentrations (<50 ppm∙m) with a declining trend expected to be under 2% at 200 ppm∙m. A linear equation was used to correct the measured path-integrated concentrations to fit the expected values. After correction, the average bias was reduced to −0.36% and there was no relationship with path-integrated concentration. A relative bias less than ±3% was achieved above ca. 150 ppm∙m with or without calibration. Measurement campaigns may reduce error by increasing path lengths to maximize path-integrated concentration. When low path-integrated concentrations are expected, calibration over the expected range is beneficial

Effects of Long Distance Transportation on Honey Bee Physiology

Despite the requirement of long distance transportation of honey bees used for pollination, we understand little how transportation affects honey bees. Three trials in three different states (CA, GA, and MI) were conducted to study the effects of long distance transportation on honey bee physiology. Newly emerged bees from one colony were split into two groups and introduced into a transported (T) colony or a stationary (S) colony in each trial. Volumes of hypopharyngeal gland acini in T colonies were significantly smaller than S colonies in all three trials. There were no significant differences between S and T colonies in juvenile hormone titers. Protein content in head showed no significant differences between S and T either in 7-day-old or 17-day-old bees of MI trial, but GA trial showed a significant reduction in bees experiencing transportation. Protein content in thorax was only measured in GA trial and was not significantly different between the two groups. Lipid content in abdomen was not significantly different between the S and T colonies in all three trials. This study suggests that bees experiencing transportation have trouble fully developing their food glands and this might affect their ability to nurse the next generation of workers

The structure of a red-shifted photosystem I reveals a red site in the core antenna

Cyanobacterial photosystem I has a highly conserved core antenna consisting of eleven subunits and more than 90 chlorophylls. Here via CryoEM and spectroscopy, the authors determine the location of a red-shifted low-energy chlorophyll that allows harvesting of longer wavelengths of light

US national park visitor experiences during COVID-19: Data from Acadia, Glacier, Grand Teton, Shenandoah, and Yellowstone National Parks

The COVID-19 pandemic has uniquely impacted US National Park Service (NPS) units. This study seeks to help inform future visitor use management and planning by compiling data from five NPS units (Acadia, Glacier, Grand Teton, Shenandoah, and Yellowstone National Parks), focusing on how the pandemic influenced management and impacted visitor use. Data were collected from both park managers and visitors. Results provide understanding regarding managerial changes, user-capacity limits, and documented changes in visitation in 2020 compared to 2019. These results are coupled with park visitor data from 2020, including visitor demographics, motivations and perceived outcomes, information sources for visiting during the pandemic, potential behavioral shifts in response to COVID-19 while on-site, and intent to visit in the future. The results suggest that the distinct shifts in visitation patterns during 2020 impacted park managers’ ability to predict and efficiently respond to visitor use changes. This issue was exacerbated by staffing shortages attributed to the pandemic. Lessons learned regarding what worked well (e.g., respondents were able to achieve health-related outcomes), and what could be improved (e.g., knowing that visitors adapted behaviors to maintain personal safety, and future staffing allocations can be focused temporally and spatially based on these 2020 use trends) can be incorporated to help prepare park managers, surrounding gateway communities, and state tourism authorities for the future