Pharyngeal diameter in various head and neck positions during exercise in sport horses

Background In equine athletes, dynamic stenotic disorders of the upper airways are often the cause for abnormal respiratory noises and/or poor performance. There are hypotheses, that head and neck flexion may influence the morphology and function of the upper airway and thus could even induce or deteriorate disorders of the upper respiratory tract. Especially the pharynx, without osseous or cartilaginous support is prone to changes in pressure and airflow during exercise. The objective of this study was to develop a method for measuring the pharyngeal diameter in horses during exercise, in order to analyse whether a change of head-neck position may have an impact on the pharyngeal diameter. Results Under the assumption that the width of the epiglottis remains constant in healthy horses, the newly developed method for calculating the pharyngeal diameter in horses during exercise is unsusceptible against changes of the viewing-angle and distance between the endoscope and the structures, which are to be assessed. The quotient of the width of the epiglottis and the perpendicular from a fixed point on the dorsal pharynx to the epiglottis could be used to determine the pharyngeal diameter. The percentage change of this quotient (pharynx-epiglottis-ratio; PE-ratio) in the unrestrained head-neck position against the reference position was significantly larger than that of any other combination of the head-neck positions investigated. A relation between the percentage change in PE-ratio and the degree of head and neck flexion could not be confirmed. Conclusions It could be shown, that the pharyngeal diameter is reduced through the contact position implemented by the rider in comparison to the unrestrained head and neck position. An alteration of the pharyngeal diameter depending on the degree of head and neck flexion (represented by ground and withers angle) could not be confirmed

Ceramic Vessels from Caddo Sites in Wood County, Texas

This article concerns the documentation of 54 ceramic vessels in the collections of the Texas Archeological Research Laboratory at The University of Texas at Austin (TARL) from seven ancestral Caddo sites in Wood County in East Texas (Figure 1). This includes vessels from A. C. Gibson (41WD1, n=2 vessels), J. H. Reese (41WD2, n=26), H. D. Spigner (41WD4, n=17), Mattie Dial (41WD5, n=2), B. F. Cathey (41WD14, n=2), J. H. Baker (41WD33, n=4), and 41WD117 (n=1 vessel). The A. C. Gibson site is situated in the floodplain of the Sabine River near the confluence with Cottonwood Creek. In 1932, looters had dig in a midden deposit (with many mussel shells) and exposed one ancestral Caddo burial with two vessels. In 1934, University of Texas archaeologists excavated two more burials (S-1 and S-2) in the midden. Burial S-1 was that of a child, in a flexed position; this burial had no associated funerary offerings. Burial S-2 held two individuals in an extended supine position in an east-west oriented grave. This burial had two ceramic vessels and a rounded elbow pipe as funerary offerings. The TARL files also indicate that at least three ancestral Caddo burials were excavated by amateur archaeologists prior to the 1970s, and at least one burial had associated ceramic vessels. The nearby Son Gibson Farm site (41WD518) is reported to have had sherds from Sanders Slipped, Sanders Engraved, Canton Incised, and Maxey Noded Redware vessels, and it may be contemporaneous with the burials at the A. C. Gibson site

Diffusion and Transport Coefficients in Synthetic Opals

Opals are structures composed of the closed packing of spheres in the size range of nano-to-micro meter. They are sintered to create small necks at the points of contact. We have solved the diffusion problem in such structures. The relation between the diffusion coefficient and the termal and electrical conductivity makes possible to estimate the transport coefficients of opal structures. We estimate this changes as function of the neck size and the mean-free path of the carriers. The theory presented is also applicable to the diffusion problem in other periodic structures.Comment: Submitted to PR

Objective classification of different head and neck positions and their influence on the radiographic pharyngeal diameter in sport horses

BACKGROUND: Various head and neck positions in sport horses are significant as they can interfere with upper airway flow mechanics during exercise. Until now, research has focused on subjectively described head and neck positions. The objective of this study was to develop an objective, reproducible method for quantifying head and neck positions accurately. RESULTS: Determining the angle between the ridge of the nose and the horizontal plane (ground angle) together with the angle between the ridge of nose and the line connecting the neck and the withers (withers angle) has provided values that allow precise identification of three preselected head and neck positions for performing sport horses. The pharyngeal diameter, determined on lateral radiographs of 35 horses, differed significantly between the established flexed position and the remaining two head and neck positions (extended and neutral). There was a significant correlation between the pharyngeal diameter and the ground angle (Spearman’s rank correlation coefficient −0.769, p < 0.01) as well as between the pharyngeal diameter and the withers angle (Spearman’s rank correlation coefficient 0.774, p < 0.01). CONCLUSION: The combination of the ground angle and the withers angle is a suitable tool for evaluating and distinguishing frequently used head and neck positions in sport horses. The ground angle and the withers angle show significant correlation with the measured pharyngeal diameter in resting horses. Hence, these angles provide an appropriate method for assessing the degree of head and neck flexion. Further research is required to examine the influence of increasing head and neck flexion and the related pharyngeal diameter on upper airway function in exercising horses

Documentation of Additional Vessels from the Johns Site (41CP12), Camp County, Texas

The Johns site (41CP12) is a Titus phase cemetery in the Prairie Creek valley in the Big Cypress Creek stream basin of the Northeast Texas Pineywoods. The Caddo artifacts from the site are from the Robert L. Turner, Jr. and Tommy John collections. Both men are current residents of Camp County, Texas. total of 35 Late Caddo (ca. A.D. 1400-1680), Titus phase, burials were excavated between May 1966 and December 1984 at the Johns site. The first 19 burials were excavated by Tommy Johns and Robert L. Turner, Jr., and Johns continued to excavate burials at the site until 1984. No single map of the plan of the Johns site cemetery exists in the available notes, but enough information is provided to reconstruct the arrangement and extent of the burial interments. The burials occur in a number of east-west rows, with the head of the deceased oriented almost always to face to the west. The deceased were placed in long, narrow, and relatively deep burial pits in an extended supine position, with funerary offerings generally placed along both the sides of the body and at the feet. Funerary offerings consisted of ceramic vessels (3-16 vessels per burial), ceramic pipes, arrow points (usually in quivers), celts, smoothing stones, as well as scrapers and other chipped stone tools. All of the burials have ceramic vessel funerary offerings, but only a small proportion had either ceramic pipes (25.7% of the burials), arrow points (62.9% of the burials), celts (17.1% of the burials), or other stone tools (17.1% of the burials) placed in the burial pit. In the summer of 2009, the Robert L. Turner, Jr. vessel and pipe collection and the Tommy Johns collection of vessels, pipes, celts, and arrow points were fully documented from the Johns site. A detailed description of each ceramic vessel or ceramic pipe was made for documentation purposes, accompanied by drawings appended to vessel documentation forms (on file, Archeological & Environmental Consultants, LLC files in Austin, Texas), where needed, of ceramic vessel decorative motifs or pipe morphology to supplement the artifact descriptions. Analysis notes and photographs were also obtained on the arrow points, celts, and other stone artifacts from a number of burials in the Johns collection. A total of 277 ceramic vessels were documented in the Turner and Johns collections from the Johns site. Subsequent to the completion of the published report, Tommy Johns located six additional vessels from the Johns site cemetery in his collection, and these vessels were documented in January 2010. This article provides information on the six previously undocumented vessels from the Johns site, increasing the total number of vessels to 283.1 With the larger sample of 283 vessels, the vessels from the Johns site are dominated by engraved fine wares (68.1%). Utility wares comprise 25.5% of the ceramic vessel mortuary offerings, and plain wares another 6.4%

Caddo Ceramic Vessels from the T. M. Sanders Site (41LR2) on the Red River in Lamar County, Texas

The T. M. Sanders site (41LR2) is one of the more important ancestral Caddo sites known in East Texas, primarily because of its two earthen mounds and the well-preserved mortuary features of Caddo elite persons buried in Mound No. 1 (the East Mound). The Sanders site is located on a broad alluvial terrace just south of the confluence of Bois d’Arc Creek and the Red River. The terrace has silt loam soils, which have a shallow dark brown silt loam A-horizon overlying thick B- and C-horizons that range from dark reddish-brown, reddish-brown, dark brown, to yellowish-red in color. These soils formed in loamy alluvial sediments of the Red River. In this Special Publication, we discuss the analysis and documentation of the 78 ceramic vessels from the T. M. Sanders site in the collections of the Texas Archeological Research Laboratory at The University of Texas at Austin. Our concern is in documenting the stylistic and technological character of these vessels, and assessing their cultural relationships and stylistic associations; almost 80 percent of these vessels are from burial features excavated by University of Texas archaeologists in Mound No. 1 (East Mound) in July and August 1931; others are from excavations in midden deposits between the two mounds. We also consider and revise the current ceramic taxonomy for a number of the vessels from the T. M. Sanders site

Risk stratification of neck lesions detected sonographically during the follow-up of differentiated thyroid cancer

Context: The European Thyroid Association (ETA) has classified post-treatment cervical ultrasound findings in thyroid cancer patients based on their association with disease persistence/recurrence. Objective: To assess this classification's ability to predict the growth and persistence of such lesions during active post-treatment surveillance of patients with differentiated thyroid cancer (DTC). Design: Retrospective, observational study Setting: Thyroid cancer center, large Italian teaching hospital. Patients: Center referrals (2005–2014) were reviewed and patients selected with pathologically confirmed DTC; total thyroidectomy, with or without neck dissection and/or radioiodine remnant ablation; abnormal findings on ≥2 consecutive post-treatment neck sonograms; subsequent follow-up consisting of active surveillance. Baseline ultrasound abnormalities (thyroid bed masses, lymph nodes) were classified according to the ETA system. Patients were divided into group S (those with ≥1 lesion classified as ‘suspicious’) and group I (‘indeterminate’ lesions only). We recorded baseline and follow-up clinical data through 30 June 2015. Main Outcomes: Patients with growth (> 3 mm, largest diameter) of ≥1 lesion during follow-up, patients with ≥1 persistent lesion at the final visit. Results: The cohort included 58 (9%) of the 637 DTC cases screened. A total of 113 lesions were followed (18 thyroid bed masses, 95 lymph nodes). During surveillance (median 3.7 years), group I had significantly lower rates than group S of lesion growth (8% vs. 36%, p=0.01) and persistence (64% vs. 97%, p=0.014). Median time to scan normalization: 2.9 years. Conclusions: The ETA's evidence-based classification of sonographically detected neck abnormalities can help identify PTC patients eligible for more relaxed follow-up

Documentation of Ancestral Caddo Ceramic Vessels from the Harold Williams Site (41CP10), Camp County, Texas

The Harold Williams site (41CP10) is a large ancestral Caddo community cemetery on Dry Creek in the Big Cypress Creek basin in Camp County, Texas. Caddo burials and associated ceramic vessel funerary offerings have been discovered and dug at the Harold Williams site since the 1940s, and in 1967 the Texas Archeological Society (TAS) held their annual field school at the site. During the course of the 1967 TAS excavations in Area A and B, several burial features were encountered and excavated, and these had associated ceramic vessels and other grave goods. These vessels were illustrated and cursorily described by Turner and Smith, and they were from Late Caddo period Titus phase graves. Recently two boxes of TAS Field School materials from the Harold Williams site were re-examined at the Texas Archeological Research Laboratory, and a number of whole and partial Caddo ceramic vessels from the TAS work were re-discovered. I took the opportunity to examine and document these vessels in detail, and the results of these analyses are presented in this article