Characterizing PM2.5 Air Samples of Northeast Mississippi

Ambient air pollution has been associated with adverse health effects throughout the entire world. Although epidemiologists study air pollution extensively, rural areas are often the least understood. In 2020, the Mississippi Department of Environmental Quality used less than 10 air sampling locations across the state leaving a large gap in air quality knowledge. In this study, fine particulate matter (PM2.5) air samples were collected from three different rural Mississippi cities–Ackerman, Eupora, and Houston, in the summer of 2020. Following collection onto filters, elemental black carbon analysis and an oxidative potential assay were both used to characterize the samples of interest. Varying results of black carbon concentration and DTT consumption from PM2.5 were observed with significant differences seen between locations and weeks of sampling. Black carbon concentrations collected at Ackerman, Eupora, and Houston had the following ranges reported in ng/m3: 0.45-1.05, 0.09-1.13, and 0.00-1.19 respectively. DTT consumption values from PM2.5 collected at Ackerman, Eupora, and Houston had the following ranges reported in nM/min/m3: 0.004-0.041, 0.006-0.022, and 0.004-0.012 respectively. A regression analysis (r2 = 0.144) between black carbon concentration and DTT consumption showed that black carbon did not fully explain DTT consumption from PM2.5 samples. This work demonstrated that there is variation in PM2.5 characteristics with location and time in rural Mississippi. Further studies need to be conducted in order to better understand black carbon concentration, DTT consumption from PM2.5, as well as other characteristics of PM2.5 within our region of study

Her World Changed: Anna Louise Strong and The 1916 Everett Massacre

The 1970s saw a resurgence in the scholarship on Anna Louise Strong’s life, especially in feminist circles. In general, historians pre-1970 doubted the authenticity of Strong’s political radicalism and criticized the inconsistency in her participation. Neis’ scholarship represents the largely uncritical second-wave feminist interest in Strong’s life following her death in 1970. The scholarship on Strong’s life falls into three categories: the old guard, the feminist renaissance, and twenty-first-century perspectives. Since 2000, a more nuanced interpretation of Strong’s life incorporated elements of the old guard and feminist discussions. Anna Louise Strong’s introduction to activism began in her childhood as the daughter of a liberal preacher and early adopters of abolition theology. After receiving her undergraduate degree from Oberlin, Anna Louise Strong presented her Ph.D. at the University of Chicago. Most of the primary sources are of Strong’s writings, including her 1935 autobiography I Change Worlds: The Remaking of an American. Strong’s faithful support of the Wobblies and more radical causes did not manifest all at once. After Strong’s testimony at Wobbly Hulet Wells’ trial in the fall of 1917, a recall movement against her gathered new momentum. Strong’s documentation of the events of the Everett Massacre of 1916 and the trials of I.W.W. trial cemented her status as a radical among the Seattle business elite

Electron-Electron Interaction in Linear Arrays of Small Tunnel Junctions

We have calculated the spatial distribution of the electrostatic potential created by an unbalanced charge $q$ in one of the conducting electrodes of a long, uniform, linear array of small tunnel junctions. The distribution describes, in particular, the shape of a topological single-electron soliton in such an array. An analytical solution obtained for a circular cross section model is compared with results of geometrical modeling of a more realistic structure with square cross section. These solutions are very close to one another, and can be reasonably approximated by a simple phenomenological expression. In contrast to the previously accepted exponential approximation, the new result describes the crossover between the linear change of the potential near the center of the soliton to the unscreened Coulomb potential far from the center, with an unexpected ``hump'' near the crossover point.Comment: 8 pages, RevTeX 3.0, 4 PostScript figures. To appear in Applied Physics Letters, circa 12 Nov 199

Cotton insect control (1993)

Reviewed October 1, 1993

The Role of EphA Receptor Signaling in Neuroblast Survival During In Vitro Differentiation

Mouse embryonic stem cells can be differentiated into multiple cell types and can serve as an excellent model for studying developmental processes in vitro. In particular, stem cells can be differentiated into forebrain-like neurons, allowing investigation of nervous system development at single cell resolution. Eph receptor tyrosine kinases and their ephrin ligands play a critical role during in vivo cortical development, particularly during axon guidance. Preliminary data has shown that EphRs and ephrins are expressed during in vitro differentiation. In addition, we see EphA7 localization at the face of neural rosettes, where it co-expresses with markers of neuroblast identity. However, the role of Eph receptors and ephrins in neurogenesis is not well understood. Previous literature had shown that ephrin-A5 and EphA7 can function to balance cortical apoptosis during embryogenesis. We hypothesized that EphR/ephrin signaling may be required to balance apoptosis during in vitro neural development. A monolayer differentiation protocol was used to generate cells of forebrain fate at high yield. RNAi knockdown of EphA3, EphA4, and EphA7, was used to identify which Eph receptor was contributing to the apoptotic effect individually. It was found that transient knockdown of EphA3 and EphA4 fail to cause changes in apoptosis levels. However, knockdown of EphA7 at differentiation days 4 through 8 lead to a reduction in apoptosis suggesting that EphA7 can positively regulate cell death during differentiation. These data confirm that in vivo developmental events such as apoptosis can be modeled in an in vitro system. The innovative methods developed throughout the process of this research project may eventually prove to be useful in the analysis of other neurodevelopmental processes

Inherited sterility induced by gamma radiation in a laboratory population of Ostrinia nubilalis (Hübner)

Male European corn borer pupae were exposed to a substerilizing dose of gamma radiation. Treated males were as successful as nonirra-diated males in spermatophore transfer and production of offspring when allowed to mate with non irradiated females. The progeny of irradiated males inherited sterility and produced no offspring when allowed to mate with normal com borers

Seasonal apiary management for Missouri (2016)

This guide describes a management program for setting up and maintaining beehives to foster healthy bees and produce surplus honey for personal use or to sell. Suggested timelines are subject to changes in weather patterns and can fluctuate as much as 30 days.Revised 3/16/Web