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Differences in the metabolic outputs of \u3cem\u3eCaulobacter crescentus\u3c/em\u3e modify the kinetics of silver nanoparticle dissolution
Get PDFSilver nanoparticles (AgNPs) are widely used within commercial products due to their distinct antibacterial and antimicrobial properties. As their utilization continues to increase, their inevitable improper disposal could present lasting environmental ramifications due to their nonspecific biotoxicity. One microorganism of interest is Caulobacter crescentus, a common freshwater bacterium found in locations where AgNPs end after their disposal. C. crescentus has two distinct cell types—a stalked and a swarmer form—each with their own unique function and metabolic outputs. Approximately 15% of the C. crescentus metabolome varies with cell cycle, thus making this an interesting and environmentally relevant model organism for this work. Adsorbates, like proteins and other metabolites readily adsorb to the surface of AgNPs forming eco-coronas, which can alter the biological fate of AgNPs. A process of synchronizing the bacteria to the same cell-cycle interval was accomplished and complex mixtures of excreted matter from the C. crescentus were isolated at different intervals in the cell cycle. These mixtures were then used to create C. crescentus eco-coronas. Electrochemical techniques such as linear sweep stripping voltammetry (LSSV) in combination with dynamic light scattering (DLS) were used to evaluate the impact of C. crescentus eco-coronas on AgNP size, charge, and dissolution. Later stages in the C. crescentus cell-cycle were shown to contain more complex mixtures of adsorbates and lead to higher AgNP dissolution rates, thus demonstrating the utility of C. crescentus to model the complex environmental reactivity of AgNPs
Optical Fiber Magnetic Field Detector
Get PDFThis project demonstrates an optical approach to magnetic field detection. Operating as an adapted Mach-Zender interferometer, the apparatus begins by splitting an infrared beam of light into two separate paths, each with 50% of the overall power. These paths are segments of single-mode photonic crystal fiber (PCF) and are of equal lengths. One of the PCF paths has its air holes infused with EMG 700 ferrofluid which, by nature of ferrofluids, has a tunable refractive index (RI). The beams are recombined and shone into a power meter for analysis. When the ferrofluid-infused path encounters a magnetic field, the RI within the fiber changes due to the presence of EMG 700, thereby causing a change in the effective travel distance for the mode of light. Thus, when the beams reunite, there will be interference. Depending on the strength of the magnetic field, the magnitude of the interference will change accordingly, resulting in a detectable relationship between the power of the emergent light and magnetic field strength
Full Issue: Volume 5, Issue 2
Get PDFThe second issue in the fifth volume of the Swarthmore Undergraduate History Journal
Poets \u3cem\u3eRooted\u3c/em\u3e In Nature: An Ecopoetry Anthology
Get PDFAnyone who has studied poetry has experienced its elusiveness as well as the profound impact that it brings upon its readers. Although poetry comes in many shapes and forms, the universal theme among impactful poetry is its ability to both evoke powerful emotions and inspire readers to action. In the somewhat bleak time of the present, individuals can easily feel insignificant among the masses; however, poetry can inspire wonder and break readers away from the screens and fickle distractions ever present in the modern world. In this anthology, we focus on the multifaceted genre of ecopoetry, a genre of poetry that includes poems with an emphasis on the environment, empathy towards all living creatures, and providing a voice to nature and its natural processes. This broad definition encompasses many poems that delve into themes ranging from the appreciation of nature and ecological awareness to sustainability and the current Anthropocene crisis. In this anthology, we will explore the extensive nature of ecopoetry through carefully curated selections. In this manner, we seek to showcase the breadth and depth of this genre and highlight the myriad of ways in which poets engage with ecological themes. We hope that in following this anthology, you as a reader will come to understand the hopeful and vast genre of ecopoetry and leave with a freshly-evoked passion and connection to our ecological environment
Concomitancia Entre La Crítica Literaria Y La Obra De Emilia Pardo Bazán A Finales Del Siglo XIX
No full textReview Of Nijinsky\u27s Feeling Mind: The Dancer Writes, The Writer Dances By N. Svobodny
No full textSvobodny (global studies, Washington Univ. in St. Louis) offers the first in-depth English-language analysis of ballet dancer and choreographer Vaslav Nijinsky’s original Russian writings. Her work is based on considerable archival research in libraries and collections in the US and Europe. The book is organized as a contrasting dialogue between Nijinsky’s experiences of and attempts to understand interior and exterior, private and public, physical and mental, and somatic and performative realities. Making strategic use of secondary sources, the author focuses on Nijinsky’s words and posits the influence of Russian literary masters such as Dostoevsky, Gogol, and Tolstoy on his writings. Svobodny investigates catalyzing events that prompted Nijinsky’s writings and argues that he wished readers to experience both his writing process and the result. Ultimately, readers must wrestle with the relationship between Nijinsky as dancer and writer. This interdisciplinary approach will be of interest to dance scholars, historians, and literary theorists. The text is supported by carefully selected English translations of selections from Nijinsky’s diaries, as well as relevant excerpts from the writings of others. Extensive notes and a lengthy bibliography extend the book’s substance and usefulness. Summing Up: Recommended. Advanced undergraduates through faculty; professionals
An Interdisciplinary Panel Of Scientists Discuss Trans- And Gender-Nonconforming-Inclusion In STEM
No full textIn June 2024, the American Statistical Association (ASA) LGBTQ+ Advocacy Committee hosted a webinar on “An Interdisciplinary Look at Trans and Gender-non-conforming Inclusion in STEM”. The webinar consisted of three presentations that approached inclusion in STEM via different viewpoints and concluded with a panel discussion. This article provides the panelists with more space to reflect upon the questions that were asked. It is the ASA LGBTQ+ Advocacy Committee’s hope that with increased awareness and understanding around SOGISC (Sexual orientation, gender identity, and sex characteristics) data, assumptions that impact data collection, data analysis, and the representation of such data as well as the treatment of the individuals who willingly identify themselves as minorities, will be reexamined
