Chiasma

Newspaper reporting on events at the Boston University School of Medicine in the 1960s

University Faculty, Colleagues and Teachers’ Federation as Mentors in Collaborative Action Research

This research reports on collaborative research projects supported by a teachers’ federation. We compare research teams involved in the first year of the project, where they had free choice of research purposes with those in the second year who had the subject area defined for them. University faculty, teachers’ colleagues, and the teachers’ federation served as mentors for participating teachers. The action research resulted in change in teachers’ practice and in the development of leadership skills.Cet article fait le compte-rendu de projets de recherche collaborative soutenus par une fédération d’enseignants. Nous y comparons l’expérience de l’équipe de chercheurs impliqués dans la première année du projet – lesquels ont eu libre choix quant à leurs objectifs de recherche – à celle de la seconde cohorte de chercheurs, devant travailler avec des objectifs déjà définis. Des membres de la faculté universitaire, des collègues enseignants ainsi que la fédération des enseignants ont agi à titre de mentors auprès des participants. L’action de recherche a eu pour résultantes des changements de la pratique enseignante et le développement d’habiletés de leadership

Safe Farm: The Impact of an Iowa Public Information Campaign

The 1992 public information campaign, Safe Farm, made farm safety messages available to a diverse and independent target audience of 104,000 full-time and parttime Iowa farm operators and their families. The print portion of the campaign reached 5.03 million Iowa newspaper subscribers. A series of public service announcements received at least 180 h of air time on more than 100 Iowa radio stations and nearly 80,000 farm safety publications were distributed by Iowa State University (ISU) Extension during the campaign.The impact of this public information campaign was measured by a baseline and follow-up telephone survey of 460 Iowa farm operators. The baseline survey showed that farm operators relied heavily on local media for farm safety information, as well as the cooperative extension service.When asked where they obtained safety information, 95% of the respondents said newspapers and magazines, 82% radio, 77% television, 59% relied on publications from ISU Extension, and 33% relied on ISU Extension staff.The follow-up survey measured significant improvements in Iowa farm operators’ awareness, concern, and behavior based on three indices composed of scales common to both surveys. A multiple regression analysis was conducted based on a causal model. The multivariate test indicated that these changes could not be statistically attributed to the Safe Farm campaign

Producing a Multilingual Audiotape Walking Tour of the Parks Library

Each year thousands of international students enter U.S, colleges and universities for the first time. Typically, these students will tour the library as part of their orientation. Tours, however, are almost always in English, and many of these students have not yet developed the English comprehension skills necessary to fully benefit from the tour. To address this problem the Iowa State University Library developed a multilingual audiotape tour of the Library. The 45 minute tour was first developed and tested in English, then translated into Arabic, Chinese, Japanese, Korean, Malay, and Spanish. A booklet, in English, accompanies the tour and provides maps and basic library information. While many of the problems of producing the English tape were anticipated, problems unique to the translated version were not. Keeping translations down to 45 minutes, knowing if the translations were correct, and recording and editing the tape when the sound technician doesn\u27t understand the language were among the many problems encountered. Evaluations of the English tape were consistently positive. Feedback on the non-English tapes is not yet sufficient to draw conclusions

Quantum key distribution at telecom wavelengths with noise-free detectors

The length of a secure link over which a quantum key can be distributed depends on the efficiency and dark-count rate of the detectors used at the receiver. We report on the first demonstration of quantum key distribution using transition-edge sensors with high efficiency and negligible dark-count rates. Using two methods of synchronization, a bright optical pulse scheme and an electrical signal scheme, we have successfully distributed key material at 1,550 nm over 50 km of optical fiber. We discuss how use of these detectors in a quantum key distribution system can result in dramatic increases in range and performance

Exploring the loblolly pine (Pinus taeda L.) genome by BAC sequencing and Cot analysis.

Loblolly pine (LP; Pinus taeda L.) is an economically and ecologically important tree in the southeastern U.S. To advance understanding of the loblolly pine (LP; Pinus taeda L.) genome, we sequenced and analyzed 100 BAC clones and performed a Cot analysis. The Cot analysis indicates that the genome is composed of 57, 24, and 10% highly-repetitive, moderately-repetitive, and single/low-copy sequences, respectively (the remaining 9% of the genome is a combination of fold back and damaged DNA). Although single/low-copy DNA only accounts for 10% of the LP genome, the amount of single/low-copy DNA in LP is still 14 times the size of the Arabidopsis genome. Since gene numbers in LP are similar to those in Arabidopsis, much of the single/low-copy DNA of LP would appear to be composed of DNA that is both gene- and repeat-poor. Macroarrays prepared from a LP bacterial artificial chromosome (BAC) library were hybridized with probes designed from cell wall synthesis/wood development cDNAs, and 50 of the "targeted" clones were selected for further analysis. An additional 25 clones were selected because they contained few repeats, while 25 more clones were selected at random. The 100 BAC clones were Sanger sequenced and assembled. Of the targeted BACs, 80% contained all or part of the cDNA used to target them. One targeted BAC was found to contain fungal DNA and was eliminated from further analysis. Combinations of similarity-based and ab initio gene prediction approaches were utilized to identify and characterize potential coding regions in the 99 BACs containing LP DNA. From this analysis, we identified 154 gene models (GMs) representing both putative protein-coding genes and likely pseudogenes. Ten of the GMs (all of which were specifically targeted) had enough support to be classified as intact genes. Interestingly, the 154 GMs had statistically indistinguishable (α = 0.05) distributions in the targeted and random BAC clones (15.18 and 12.61 GM/Mb, respectively), whereas the low-repeat BACs contained significantly fewer GMs (7.08 GM/Mb). However, when GM length was considered, the targeted BACs had a significantly greater percentage of their length in GMs (3.26%) when compared to random (1.63%) and low-repeat (0.62%) BACs. The results of our study provide insight into LP evolution and inform ongoing efforts to produce a reference genome sequence for LP, while characterization of genes involved in cell wall production highlights carbon metabolism pathways that can be leveraged for increasing wood production

Long distance decoy state quantum key distribution in optical fiber

The theoretical existence of photon-number-splitting attacks creates a security loophole for most quantum key distribution (QKD) demonstrations that use a highly attenuated laser source. Using ultra-low-noise, high-efficiency transition-edge sensor photodetectors, we have implemented the first version of a decoy-state protocol that incorporates finite statistics without the use of Gaussian approximations in a one-way QKD system, enabling the creation of secure keys immune to photon-number-splitting attacks and highly resistant to Trojan horse attacks over 107 km of optical fiber.Comment: 4 pages, 3 figure