108,390 research outputs found
WPA Interview - Tinnie T. Combs
No full textA transcript of a WPA interview by Sheldon F. Gauthier with Tinnie T. Combs in the 1930s. Combs was born in 1855 while her family was moving to Texas from Tennessee. They settled at Dozier Creek which is now part of Eagle Mountain Lake. She explains that Fort Worth was the trading post the family used but does not recall much of the village. Combs does describe life growing up in Dozier Creek, mostly how the family produced their own food, raised livestock and made everything themselves. In the interview she shows a quilt she made fully by hand. Combs describes the situation the settlers had with Indians.https://mavmatrix.uta.edu/specialcollections_workprojectsadministration/1140/thumbnail.jp
Letter, [Author unclear] to Paulina T. Merritt
No full textHandwritten letter to Paulina Merritt from an unknown author, October 1, 1876.
Military Operations Research Society (MORS) Oral History Project Interview of Dr. Mark T. Lewellyn
No full textInterviewers: Dr. George Akst, FS, and Dr. Bob Sheldon, FS. The interview was conducted via Zoom on August 9, 2022."final published version
Conservation value of variable connectivity: aquatic invertebrate assemblages of channel and floodplain habitats of a central Australian arid-zone river, Cooper Creek
No full textSheldon, Fran; Boulton, Andrew J.; Puckridge, Jim T
Leuctra pinhoti Grubbs & Sheldon 2009, sp. n.
No full textLeuctra pinhoti sp. n. (Figs. 1–8) Material examined. Holotype ♂, U.S.A., Alabama, Cleburne Co., unnamed tributary to South Fork Terrapin Creek, Talladega National Forest, 33°52.671N, 085°33.282W, 22 May 2006, A.L. Sheldon (INHS). Additional paratypes: same as Holotype but 3 ♂ (INHS, WKU); unnamed tributary to South Fork Terrapin Creek, Talladega National Forest, 33°52.790N, 085°34.026W, 11 May 2005, 1 ♂, A.L. Sheldon (WKU); unnamed tributary to South Fork Terrapin Creek, Talladega National Forest, 33°53.059N, 085°34.520W, 22 May 2006, 1 ♂, A.L. Sheldon (WKU); unnamed tributary to South Fork Terrapin Creek, Talladega National Forest, 33°53.188N, 085°33.352W, 17 May 2008, 5 ♂, S.A. Grubbs (WKU). Male. Forewing length 5.5–6.0 mm. General body color and wings brown, typical of the genus. Cerci tubular and unmodified, typical of genus. Abdominal terga 1–7 unmodified. Abdominal tergum 8 with mesal portion unsclerotized, lateral margins lightly sclerotized; a darkly sclerotized anterior band expanded medially into a narrow dorsal process ca. 1/6 th of segment width, extending beyond middle of segment, process narrowing slightly beyond base before expanding posteriorly to a slightly medially concave tip, appearing arcuate when viewed anterodorsally due the presence of small lateroapical lobes (Figs. 1, 5–6). Specilla thickened and broad basally, in lateral view, proximal 2/3 rd subrectangular in shape with subtriangular distal 1/3 rd and rounded tip, toothed posteriorly along distal half (Figs. 2–3, 7–8). Lateral styles flattened and subtriangular basally, sinuate and tapering to an apically acute, anterdorsallydirected tip (Figs. 2–3, 7–8). Vesicle simple and gourd-like, with long hairs directed posteroventrally (Fig. 4). Female. Unknown. Larva. Unknown. Etymology. The specific name, used as a noun in apposition, refers to the type locality positioned at a crossing of the Pinhoti National Recreation Trail. Pinhoti was an Upper Creek (= Muskogean) Native Americans village located in this region. The common name, Pinhoti Needlefly, is proposed for this species (Stark et al. 1998). Diagnosis. According to the Nearctic species groups defined recently by Harper & Harper (1997), Leuctra pinhoti belongs to the L. biloba Claassen group with L. alexanderi Hanson, L. biloba, L. mitchellensis Hanson, L. monticola Hanson and L. nephophila Hanson. The male of L. pinhoti possesses a well-developed process on the 8 th abdominal tergum, the specilla (= subanal lobes) are broadened basally with toothed outer margins, and the lateral styles (= paraprocts) are flattened and recurved anterodorsally. Leuctra pinhoti can be distinguished from the other members of the L. biloba group mainly by the width and shape of the 8 th abdominal dorsal process (Hanson, 1941a,b; Harper & Harper, 1997). The dorsal process of L. pinhoti is only ca. 1/6 the width of the 8 th tergum, contrasting markedly from L. alexanderi (ca. 1/3), L. biloba (1/3), L. mitchellensis (ca. 1/3), L. monticola (ca. 1/2) and L. nephophila (ca. 1/4). Although the shape of the dorsal process of L. pinhoti (i.e. narrow beyond base, but expanding slightly distally) is similar to L. alexanderi, L. mitchellensis and L. monticola, it is easily distinct from these three species due to the clearly narrower profile as seen in dorsal view. The strongly bilobed dorsal process of L. biloba and the presence of the broad subapical shoulders of the dorsal process prior to the tear-drop shaped apical portion of L. nephophila are both distinct from L. pinhoti. Remarks. The type locality is an unnamed headwater stream draining the eastern flanks of Dugger Mountain, Alabama’s second highest peak at 650 m A.S.L. that is located in the Dugger Mountain Wilderness Area in Talladega National Forest. Despite intensive collecting efforts throughout the Talladega region we have yet to collect this species from other drainages. Alloperla chloris Frison, A. usa Ricker, Amphinemura nigritta (Provancher), Beloneuria jamesae Stark & Szczytko, Eccoptura xanthenes (Newman), Hansonoperla cheaha Kondratieff & Kirchner, Leuctra grandis Banks, Sweltsa onkos (Ricker), Tallaperla laurie (Ricker) and T. maria (Needham & Smith) have been collected with L. pinhoti.Published as part of Grubbs, Scott A. & Sheldon, Andrew L., 2009, Leuctra Pinhoti, A New Species Of Stonefly (Plecoptera: Leuctridae) From Alabama, U. S. A., pp. 195-198 in Illiesia 5 (19) on pages 195-197, DOI: 10.5281/zenodo.475817
Structural investigations of amavadin-based vanadium complexes
No full textThis thesis is focused on the synthesis and structure of amavadin and related complexes. Secondly, amavadin's catalytic properties are explored. Chapter 1 provides a general introduction to the chemistry of vanadium. Chapter 2 describes the first enantioselective synthesis of the amavadin ligand and the preparation of amavadin, including its optical antipode. Chapter 3 deals with the synthesis of amavadin-like ligands, i.e. N-substituted N-hydroxy amino acids. The first approach comprised cyanide addition to nitrones, but the hydrolysis of the resulting alpha-cyano secondary hydroxylamines was unsuccessful. The second approach comprised nitrone reduction ('reductive hydroxylamination') and proved to be a versatile method to prepare amavadin-based ligands. An interesting spin-off is an effective and easily applicable method to obtain racemic N-hydroxy amino acid esters. Chapter 4 describes the synthesis and investigation of amavadin-based vanadium complexes. With the meso-ligand of amavadin, the synthesis and X-ray crystallographic study of 'meso-amavadin' was performed. Next, a model was developed that could be used to predict the 1H and 13C NMR spectra of amavadin analogues. It was furthermore shown that increasing the size of the backbone substituents gave vanadium(IV) non-oxo complexes analogous to amavadin. In contrast, protection or complete lack of one carboxylate per ligand did not give stable vanadium(IV) non-oxo compounds. Chapter 5 discusses the physical and chemical properties of amavadin: hydration/dehydration, solubility, the observed autoreduction of oxidized amavadin in water and the reactivity of amavadin with peroxides. Chapter 6 describes applications of amavadin as an oxidation catalyst. In water, activity was observed for alcohol oxidations and sulfoxidations. Better results were obtained in non-aqueous and aprotic environments (epoxidation of cinnamyl alcohol and oxidation of benzyl alcohol). Chapter 7 is concerned with vanadium catalysts for cyanide additions to aldehydes. Firstly, the tert-butyl groups of the vanadium-salen system were substituted for tert-amyl groups. Secondly, amavadin was tested in cyanide additions.Applied Science
Handwritten biographical information on Paulina T. McClung Merritt
No full textA handwritten biography of Paulina T. McClung Merritt by an unknown author, 1892.
Chiral dirhodium catalysts immobilised in porous hosts: Synthesis and performance
No full textThe main objective of this research is to modify the catalytic properties of homogeneous chiral dirhodium catalysts upon immobilisation on the porous support materials silica, MCM-41 and TUD-1. The catalysts were immobilised via ligand exchange of one chiral ligand with a carboxylate tether group. This influences the enantio- and trans/cis selectivity of the catalysts in the cyclopropanation reaction of styrene with ethyl or tert-butyl diazoacetate and the Si-H insertion reaction of dimethylphenylsilane with methyl phenyldiazoacetate. The results show that it is possible to influence the selectivity of these catalysts by immobilising them. Leaching of the catalyst from the carrier materials remains a problem. Full conversions are still possible upon recycling, but analysis shows that a significant amount of rhodium leaches. In some cases the active catalyst leaches, in others the filtrate is not active, so non-active rhodium leaches. Future work needs to be addressed to the optimisation of the constraint induced by the pore walls as well as to the problem of leaching. The former would be greatly facilitated by computational modelling studies and the latter by ligands that are giving a more stable complex (e.g. four- or six-dentate ones).Applied Science
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