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Tallahassee, FL, United States

Johnson A.,Tallahassee Community College | Johnson A.,University of Florida | Merilis G.,Tallahassee Community College | Merilis G.,Florida State University | And 4 more authors.
Journal of the Electrochemical Society | Year: 2013

Members of the genus Clostridia can reduce Pd(II) ions to form metallic Pd nanoparticles (bio-Pd). Cultures of C. pasteurianum BC1 were used to generate bio-Pd, which is primarily formed on the microbial cell wall. Batch experiments using C. pasteurianum BC1 cells loaded with bio-Pd showed efficient reduction of the organic azo dyes, methyl orange and Evans blue, while little reduction of dyes was observed in control experiments using Pd-containing heat-killed microbial cultures or Pd-free viable bacterial cultures. Degradation of azo dyes was found to occur via reductive hydrogenation of the azo-linkage. Molecular hydrogen, which is concomitantly generated by C. pasteurianum, is used in the reduction reaction. The process described in this study is a potentially viable alternative to current groundwater and wastewater treatment technologies that fail to adequately degrade the large quantities of hazardous spent textile dyes that are discharged into the environment each year. © 2012 The Electrochemical Society. Source


Walker J.P.,Tallahassee Community College | Sampson V.,Florida State University
Journal of Chemical Education | Year: 2013

This paper presents preliminary evidence supporting the use of peer review in undergraduate science as a means to improve student writing and to alleviate barriers, such as lost class time, by incorporation of the peer-review process into the laboratory component of the course. The study was conducted in a single section of an undergraduate general chemistry laboratory course offered at a large two-year community college located in the southeastern United States. The chemistry laboratory course was taught using Argument-Driven Inquiry, an instructional model that incorporates double-blind group peer review of student laboratory reports, and allows students to revise their reports based on the peer reviews. The reports written for each laboratory activity were used to examine changes in the students' writing skills over time and to identify aspects of science writing that were the most difficult for the undergraduates in this context. The reviews generated by the students were used to evaluate student engagement in the peer-review process. The results of a quantitative and qualitative analysis of the reports and reviews indicate that the participants made significant improvements in the their ability to write in science and were able to evaluate the quality of their peers' writing with a relatively high degree of accuracy, but also struggled with several aspects of science writing. © 2013 The American Chemical Society and Division of Chemical Education, Inc. Source


Lo A.L.,Tallahassee Community College | Hsu L.K.G.,Tufts University | Vandereycken W.,Catholic University of Leuven
History of Psychiatry | Year: 2012

Austere and prolonged fasting among Shangqing Daoist priestesses (Daogu) of the Tang Dynasty (618-907) occurred as part of a lifestyle practice to achieve a mystical state of afterlife existence, body immortality and residence in the Shangqing heavenly kingdom. These fasting practices were conducted exclusively for religious reasons and cannot be reconceptualized as a form of an eating disorder without radically altering their original purpose and meaning. © The Author(s) 2012. Source


MacRae P.S.D.,Florida State University | MacRae P.S.D.,Tallahassee Community College | Travis J.,Florida State University
Environmental Biology of Fishes | Year: 2014

We report the results of a long-term examination of variation in adult density in the least killifish, Heterandria formosa, and the associations among adult density and a variety of ecological factors. We used data from 11 populations of H. formosa in Northwest Florida, collected between 2000 and 2010, to examine the relationships among temporal and spatial variation in adult density and (1) the composition of the aquatic fauna community among habitats (springs, ponds, and tidal marshes) where H. formosa are found, (2) an index of predation pressure and (3) the sampling season, distance from shore (cm), water depth (cm), and aquatic vegetation cover (%) in throw traps at each sampling event. We found clear evidence that adult densities of H. formosa vary widely but consistently among populations, with greater spatial variation than temporal variation in density estimates. Site identity explained most of the variation in density among populations, and there was no long-term consistent association of variation in density with different habitats; sites of the same habitat type were as likely to have characteristically different densities as were sites of different habitat types. Average adult densities of H. formosa increased as aquatic vegetation cover increased and as the index of predation pressure decreased, however assemblage structure was not a strong predictor of density. These results show that despite marked community, abiotic and biotic distinctions between habitat types, location-specific variation was the predominant signal in these data. © 2013 Springer Science+Business Media Dordrecht. Source


Sharma R.,Florida State University | Sharma R.,Innovations And Solutions Inc. | Sharma R.,Tallahassee Community College | Sharma A.,University of Rajasthan | Chen C.J.,Florida State University
Open Nanomedicine Journal | Year: 2011

Heating tumors by nanoparticles and resistance in tumor cells to a high temperature is emerging as an effective tool as nanomedicine tool in cancer therapy. The art of thermal mapping in a tumor at various locations is emerging as the selective approach of hyperthermia to monitor temperature and treat the tumor. However, thermometry and tumor cell interaction with nanoparticles may monitor and evaluate the tumor cell survival after exposure to high physiological temperatures but show cytotoxicity. The design and application of 10-100 nano meter sized nanoparticles in tumor hyperthermia has emerged as an effective technology in hyperthermia imaging and treatment. The temperature and nanoparticle magnetic moment relationship is specific. Furthermore, there are two main issues that are unsolved as of yet. First issue is the relationship of tumor energy changes due to tumor magnetization by different nanoparticles. The second issue is the heat transfer behavior of the nanoparticle inside the tumor combined with hyperthermia and efficacy of combined modality on the tumor tissue temperature rise. In present study, we highlight that in vivo imaging such as MR thermometry, photoacuastic mapping of different tumor locations solve these issues to some extent. The art of combined use of hyperthermia by nanoparticles with hypoxia sensitive nitroimidazole radiosensitizers with chemotherapeutic drugs is highlighted to have a great impact on public health as alternative therapeutic oncology and monitoring therapy. © Sharma et al.; Licensee Bentham Open. Source

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