Hello, Readers!

My name is Alexa Schreier and I am serving as the Barbara Holley Intern for the next year (through Academic Year 2015/2016)! As the Holley Intern I will be moving around between the four main departments at Musselman Library, which includes Special Collections & Archives, Tech Services, User Services, and Research and Instruction. [excerpt

The Art of Processing a Collection

One of the most astounding things about Special Collections and Archives is that there is no necessarily right or wrong way to process a collection. If you have the same questions as I did when I first started, you may be wondering what exactly processing a collection means. Coming from a background of working in libraries, there has always been a right and wrong order, and most often than not the right way includes being alphabetical and chronological. However, that’s not always the case in Special Collections. What I’ve learned so far is that effectively processing a collection means to organize any array of papers, letters, artifacts, etc., in a manner that will make it easiest for researchers to either know if the collection could be useful to them, or quickly identify which parts of a collection they’re interested in. [excerpt

Phylogenetic analysis of microbial communities in different regions of the gastrointestinal tract in Panaque nigrolineatus, a wood-eating fish

The Neotropical detritivorous catfish Panaque nigrolineatus imbibes large quantities of wood as part of its diet. Due to the interest in cellulose, hemi-cellulose and lignin degradation pathways, this organism provides an interesting model system for the detection of novel microbial catabolism. In this study, we characterize the microbial community present in different regions of the alimentary tract of P. nigrolineatus fed a mixed diet of date palm and palm wood in laboratory aquaria. Analysis was performed on 16S rRNA gene clone libraries derived from anterior and posterior regions of the alimentary tract and the auxiliary lobe (AL), an uncharacterized organ that is vascularly attached to the midgut. Sequence analysis and phylogenetic reconstruction revealed distinct microbial communities in each tissue region. The foregut community shared many phylotypes in common with aquarium tank water and included Legionella and Hyphomicrobium spp. As the analysis moved further into the gastrointestinal tract, phylotypes with high levels of 16S rRNA sequence similarity to nitrogen-fixing Rhizobium and Agrobacterium spp. and Clostridium xylanovorans and Clostridium saccharolyticum, dominated midgut and AL communities. However, the hindgut was dominated almost exclusively by phylotypes with the highest 16S rRNA sequence similarity to the Cytophaga-Flavobacterium-Bacteroides phylum. Species richness was highest in the foregut (Chao(1) = 26.72), decreased distally through the midgut (Chao(1) = 25.38) and hindgut (Chao(1) = 20.60), with the lowest diversity detected in the AL (Chao(1) = 18.04), indicating the presence of a specialized microbial community. Using 16S rRNA gene phylogeny, we report that the P. nigrolineatus gastrointestinal tract possesses a microbial community closely related to microorganisms capable of cellulose degradation and nitrogen fixation. Further studies are underway to determine the role of this resident microbial community in Panaque nigrolineatus

Examination of a culturable microbial population from the gastrointestinal tract of the wood-eating loricariid catfish Panaque nigrolineatus

Fish play a critical role in nutrient cycling and organic matter flow in aquatic environments. However, little is known about the microbial diversity within the gastrointestinal tracts that may be essential in these degradation activities. Panaque nigrolineatus is a loricariid catfish found in the Neotropics that have a rare dietary strategy of consuming large amounts of woody material in its natural environment. As a consequence, the gastrointestinal (GI) tract of P. nigrolineatus is continually exposed to high levels of cellulose and other recalcitrant wood compounds and is, therefore, an attractive, uncharacterized system to study microbial community diversity. Our previous 16S rRNA gene surveys demonstrated that the GI tract microbial community includes phylotypes having the capacity to degrade cellulose and fix molecular nitrogen. In the present study we verify the presence of a resident microbial community by fluorescence microscopy and focus on the cellulose-degrading members by culture-based and 13C-labeled cellulose DNA stable-isotope probing (SIP) approaches. Analysis of GI tract communities generated from anaerobic microcrystalline cellulose enrichment cultures by 16S rRNA gene analysis revealed phylotypes sharing high sequence similarity to known cellulolytic bacteria including Clostridium, Cellulomonas, Bacteroides, Eubacterium and Aeromonas spp. Related bacteria were identified in the SIP community, which also included nitrogen-fixing Azospirillum spp. Our ability to enrich for specialized cellulose-degrading communities suggests that the P. nigrolineatus GI tract provides a favorable environment for this activity and these communities may be involved in providing assimilable carbon under challenging dietary conditions

Periodic Pattern in the Residual-Velocity Field of OB Associations

An analysis of the residual-velocity field of OB associations within 3 kpc of the Sun has revealed periodic variations in the radial residual velocities along the Galactic radius vector with a typical scale length of lambda=2.0(+/-0.2) kpc and a mean amplitude of fR=7(+/-1) km/s. The fact that the radial residual velocities of almost all OB-associations in rich stellar-gas complexes are directed toward the Galactic center suggests that the solar neighborhood under consideration is within the corotation radius. The azimuthal-velocity field exhibits a distinct periodic pattern in the region 0<l<180 degrees, where the mean azimuthal-velocity amplitude is ft=6(+/-2) km/s. There is no periodic pattern of the azimuthal-velocity field in the region 180<l<360 degrees. The locations of the Cygnus arm, as well as the Perseus arm, inferred from an analysis of the radial- and azimuthal-velocity fields coincide. The periodic patterns of the residual-velocity fields of Cepheids and OB associations share many common features.Comment: 21 page

Three-dimensional simulations of the orientation and structure of reconnection X-lines

This work employs Hall magnetohydrodynamic (MHD) simulations to study the X-lines formed during the reconnection of magnetic fields with differing strengths and orientations embedded in plasmas of differing densities. Although random initial perturbations trigger the growth of X-lines with many orientations, at late time a few robust X-lines sharing an orientation reasonably consistent with the direction that maximizes the outflow speed, as predicted by Swisdak and Drake [Geophys. Res. Lett., 34, L11106, (2007)], dominate the system. The existence of reconnection in the geometry examined here contradicts the suggestion of Sonnerup [J. Geophys. Res., 79, 1546 (1974)] that reconnection occurs in a plane normal to the equilibrium current. At late time the growth of the X-lines stagnates, leaving them shorter than the simulation domain.Comment: Accepted by Physics of Plasma

And Then There Was One...

As you can tell from the many “last posts” below, Special Collections has grown increasingly quiet over the past two weeks, as all of the other interns have completed their time here at the library. Despite being the last one standing, a very quiet Special Collections has allowed me to put the finishing touches on the Dance Card Collection (Shall We Dance) that Avery and I spent a large portion of the summer working on. Though at times the project seemed never ending, between finding new dance cards in the depth of already existing collections, to learning what it means to create metadata for our newly digitized dance cards, the project has been finally launched. [excerpt

The Day is Done

It truly seems as though my time in Special Collections started only a few short weeks ago, when in actuality three months and a variety of projects have since taken place. From making countless boxes, to repairing a 200 year old book, to digitizing dance cards, my time in Special Collections has provided me with invaluable hands-on conservation and processing experience. One of the most unique aspects about Special Collections (that I’ll greatly miss) is the spontaneous experiences of discovering a new historical treasure on every shelf or seeing a patron bring in a valuable item and share their side of the story on any given historical event or time period. I think it goes without saying that I won’t be able to stay away for too long before coming back to visit! [excerpt

Summer in Special Collections

With no windows to the outside world and a thermostat that always reads a brisk 66°F, it feels as though summer never comes in Special Collections. However, these measures are taken to protect the many rare and delicate items housed behind the doors of the Special Collections and College Archives Department in Musselman Library’s third floor. [excerpt

5 Banned Book (Librarian Approved) Must-Reads: In Honor of Banned Books Week

Each year, the American Library Association celebrates Banned Books for one week to inspire conversation, thought, and awareness around censorship. This Banned Books Week, Musselman Library is celebrating the freedom to read by promoting books that are banned or challenged in other libraries. We have pulled together a list of 5 books, some old and some new— but all equally beloved — that have been banned or challenged. [excerpt