An evaluation of yellow-poplar samaras by radiography

Control-pollinated samaras from 25 clones in a yellow-poplar breeding orchard at the University of Tennessee, Knoxville, were subjected to radiograph and germination analysis. A high correlation was found between filled samaras identified from radiographs and samaras that germinated. Significant differences were observed among clones used as females for percentage filled samaras; no such differences were present among pollen parents. Viability tended to be higher when clones were cross-pollinated than when the same clones were open-pollinated. Analysis of 62 crosses and their reciprocals indicated significant difference between the two, thus, precluding a partial diallel analysis for viability and indicating a strong maternal effect. An irradiation (gamma) study revealed that there is no significant effect with respect to germination and seedling dry weight from exposure to doses of radiation up to and including 2500R. Seedling length showed significant differences among treatments below 2500R with the two half-sib families used in the study reacting somewhat differently to the radiation treatment. Statistical analysis of ten arbitrarily assigned zones of viability within several ripe gynoecia revealed that the topmost and lowermost (basal) samaras on the yellow-poplar cone are generally nonviable

Levels of Aspiration and Family Affection : Religious Preference as a Variable

Author Institution: Department of Sociology and Anthropology, The Ohio State University, Columbus 1

History of Ahorey Congregation

https://digitalcommons.acu.edu/crs_books/1229/thumbnail.jp

The Ursinus Weekly, November 7, 1932

Max Montor featured in dramatic offerings • Bears claw undefeated Drexel Dragons in humiliating defeat, 28-6 • Girls\u27 hockey team loses to Swarthmore sticksters • Frosh tie Dragons, 6-6 after close fight • Ursinus debating league to convene this Saturday • Zimmer Harp Trio will be heard in recital • Track men to compete in conference meet • Social activities council discusses future plans • Novel hobo hop presents Ken Nichols and his orchestra • Men\u27s student council discuss conference plans • Schaff play cast picked • Tea served at Shreiner • Faculty club meets at Dr. Barnard\u27s • Co-eds feature Halloween party in field cage • Results of YWCA ballot point to Hoover\u27s election • Varsity Club convenes • Glee Club scheduled for two concerts this week • WSGA convenes • Mod. lang. group meets • Y.W. discusses politics • Y.W.C.A. cabinet meeting • Inter-sorority council discusses rushing rules • Booters defeat Haverford 3rd by decisive 2-0 count • Y.M.-Y.W.C.A. to present Ba thane, play of India • Sunday school groups hold interesting discussions • Assistants for 1934 Ruby • Drexel pep meetinghttps://digitalcommons.ursinus.edu/weekly/2035/thumbnail.jp

Anterior cruciate ligament reconstruction with bone-patellar tendon-bone autograft versus allograft in young patients

Objectives: Traditionally, bone-patella tendon-bone (BTB) autograft has been the gold standard graft choice for younger, athletic patients requiring ACL reconstruction. However, donor site morbidity, post-operative patella fracture, and increased operative time have led many surgeons to choose BTB allograft for their reconstructions. Opponents of allografts feel that slower healing time, higher rate of graft failure, and potential for disease transmission makes them undesirable graft choices in athletic patients. The purpose of this study is to evaluate the clinical outcomes, both subjective and objective, of young patients that who have undergone either BTB autograft or allograft reconstructions with a minimum of 2-year follow-up. Methods: One hundred and twenty patients (60 autograft, 60 allograft), age 25 and below at time of surgery, were contacted after being retrospectively identified as patients having an ACL reconstruction with either a BTB allograft or autograft by one senior surgeon. Patients were administered the Lysholm Knee Scoring Scale and IKDC Subjective Knee Evaluation questionnaires. Fifty (25 BTB autograft and 25 BTB allograft) of the 120 returned for physical examination as well as completion of a single leg hop test and laxity evaluation using a KT-1000 arthrometer evaluation. Of the 120 patients contacted, there were a total of 7 failures (5.8%) requiring revision, 6 in the allograft group (86%) and 1 in the autograft group (14%). Results: The average Lysholm scores were 89.0 and 89.56 and the average IKDC scores were 90.8 and 92.1 in the autograft and allograft groups respectively. The differences in the Lysholm scores and the IKDC scores were not significant. The single leg hop and KT-1000 scores were also not significantly different. One autograft patient had a minor motion deficit. Three allograft patients had a grade 1 Lachman and pivot glide. One autograft patient and two allograft patients had mild patellafemoral crepitus. There was no significant difference in anterior knee pain between the two groups Conclusion: There is no significant difference in patient-rated outcome between ACL reconstructions using BTB autografts versus allografts. However, the overall study group did reveal an increased failure rate requiring revision in the allograft group. © The Author(s) 2015

Increasing Underrepresented Scientists in Cancer Research: The UCSD CURE Program

The Moores UCSD Cancer Center’s Continuing Umbrella of Research Experiences program aims to increase the number of underrepresented students pursuing careers in cancer research, cancer care, and health disparities research. Participants receive 8 weeks of laboratory and classroom training during the summer followed by participation in research mentors’ laboratories. Of the 82 CURE students accrued (2002 and 2008), 91% persisted in science after 1 year. Of the 63 students eligible to graduate in 2009, 7 had dropped out of college; 56 graduated. Of the graduates, 98% were science majors and 61% (34) had already matriculated to graduate or health professional schools for cancer research and clinical care careers

Modelling ultrasound-induced mild hyperthermia of hyperplasia in vascular grafts

<p>Abstract</p> <p>Background</p> <p>Expanded polytetrafluoroethylene (ePTFE) vascular grafts frequently develop occlusive neointimal hyperplasia as a result of myofibroblast over-growth, leading to graft failure. ePTFE exhibits higher ultrasound attenuation than native soft tissues. We modelled the selective absorption of ultrasound by ePTFE, and explored the feasibility of preventing hyperplasia in ePTFE grafts by ultrasound heating. Specifically, we simulated the temperature profiles of implanted grafts and nearby soft tissues and blood under ultrasound exposure. The goal was to determine whether ultrasound exposure of an ePTFE graft can generate temperatures sufficient to prevent cell growth on the graft without damaging nearby soft tissues and blood.</p> <p>Methods</p> <p>Ultrasound beams from two transducers (1.5 and 3.2 MHz) were simulated in two graft/tissue models, with and without an intra-graft cellular layer mimicking hyperplasia, using the finite-difference time-domain (FDTD) method. The resulting power deposition patterns were used as a heat source for the Pennes bioheat equation in a COMSOL^®Multiphysics heat transfer model. 50°C is known to cause cell death and therefore the transducer powers were adjusted to produce a 13°C temperature rise from 37°C in the ePTFE.</p> <p>Results</p> <p>Simulations showed that both the frequency of the transducers and the presence of hyperplasia significantly affect the power deposition patterns and subsequent temperature profiles on the grafts and nearby tissues. While neither transducer significantly raised the temperature of the blood, the 1.5-MHz transducer was less focused and heated larger volumes of the graft and nearby soft tissues than the 3.2-MHz transducer. The presence of hyperplasia had little effect on the blood's temperature, but further increased the temperature of the graft and nearby soft tissues in response to either transducer. Skin cooling and blood flow play a significant role in preventing overheating of the native tissues.</p> <p>Conclusions</p> <p>Modelling shows that ultrasound can selectively heat ePTFE grafts and produce temperatures that cause cell death on the graft. The temperature increase in blood is negligible and that in the adjacent soft tissues may be minimized by skin cooling and using appropriate transducers. Therefore, ultrasound heating may have the potential to reduce neointimal hyperplasia and failure of ePTFE vascular grafts.</p