Anatomy of the transmastoid endolymphatic sac decompression in the management of Ménière’s disease.

Ménière’s disease affects 1 in 1000 people and produces vertigo and hearing loss (Morrison, 1981). Endolymphatic sac decompression has been advocated on the basis that endolymphatic hydrops is the underlying pathology. The endolymphatic sac is said to be the terminal dilatation of the membranous labyrinth. It has been proposed that endolymph flows from the semicircular canals and cochlea to the endolymphatic sac. Portman (1927) devised a procedure for ‘decompressing’ the endolymphatic sac by removal of the bone from the posterior cranial fossa to relieve the symptoms of Ménière’s disease. Surgery on the endolymphatic sac remains controversial. Shea (1979) and Bagger-Sjöbäck et al (1990, 1993) have studied the endolymphatic sac using different techniques. There are discrepancies in the results between the two studies. The hypothesis that the endolymphatic sac can be safely approached and decompressed by a transmastoid route was tested. A total of thirteen cadaver heads and ten isolated temporal bones were used. A series of dissections were performed to examine the endolymphatic sac, perform measurements and analyse surgical approaches to the sac. Histological and electron microscopic study were performed. The lumen of the endolymphatic sac was not always identifiable in the dura of the posterior cranial fossa or it frequently lay over the sigmoid sinus. In the dura of the posterior cranial fossa where the endolymphatic sac is located was a thickening of the dura. This thickening was present even in the absence of the endolymphatic sac. The endolymphatic sac can be safely approached by a transmastoid approach, if there is an extraosseous component to the endolymphatic sac. The proximal endolymphatic sac can be approached by posterior cranial fossa route

The Dilemmas of Diffusion: Institutional Transfer & the Remaking of Vocational Training Practices in Eastern Germany, CES Germany & Europe Working Papers, No. 05.10, 1996

Through a case study of the diffusion of the celebrated West Gennan "dual system" of vocational training to the territory of the fonner German Democratic Republic, we develop the argument that local sociopolitical relations matter crucially for the successful transfer and implementation of institutional arrangements. Notwithstanding massive levels of government funding, the presence of complementary supports, and the concerted efforts of Ger­many's social partners, the dual system is experiencing significant difficulties in the new federal states of the East. These difficulties are not due simply to the particular politics of unification (the wholesale transfer of West German institutions whether or not they were appropriate to Eastern Germany) nor even simply to the paucity of dynamic private firms capable of and willing to train new apprentices. The difficulties stem also from the under­ lying weaknesses of the East German sociopolitical infrastructure on which the entire dual system rests. This. hy­ pothesis is elaborated and substantiated through a range of data on training in the East and especially through the use of detailed case studies of Leipzig and Chemrutz

Does Compliance Pay? Social Standards and Firm-Level Trade

What is the relationship between trade and social institutions in the developing world? The research literature is conflicted: Importing firms may demand that trading partners observe higher labor and environmental standards, or they may penalize higher standards that raise costs. This study uses new data on retailers and manufacturers to analyze how firm-level trade responds to information about social standards. Contrary to the “race to the bottom” hypothesis, it finds that retail importers reward exporters for complying with social standards. In difference-in-differences estimates from over 2,000 manufacturing establishments in 36 countries, achieving compliance is associated with a 4% [1%, 7%] average increase in annual purchasing. The effect is driven largely by the apparel industry—a long-term target of anti-sweatshop social movements—suggesting that activist campaigns can shape patterns of global trade

Evaluation of alternative antemortem diagnostic samples for porcine reproductive and respiratory syndrome virus

Objective: To assess the diagnostic accuracy of two minimally invasive methods of blood collection and a reference method. Materials and methods: Blood samples were collected from 30 pigs at 7 and 8 weeks of age. Fifteen pigs were then inoculated with porcine reproductive and respiratory syndrome virus (PRRSV) VR-2332 and 15 remained uninoculated. Pigs were sampled weekly for 7 weeks post inoculation (PI) using a reference sample (jugular vein sample) and two index samples (whole blood from the auricular vein collected either with a sterile polyester swab or using a capillary tube system). All samples were tested by quantitative reverse transcriptase-polymerase chain reaction (qPCR) and enzyme-linked immunosorbent assay (ELISA) using established protocols. Continuous sample data for the three sampling methods were compared by analysis of the area under the receiver-operating characteristic curve. Results: Sensitivity and specificity of qPCR testing for all samples ranged from 93% to 100% for weeks 1 through 3 PI. Results of ELISA testing depended on cutoff selection. Optimized ELISA sample:positive (S:P) ratio cutoffs for swab-sample data were significantly lower (mean S:P ratio cutoff = 0.08, SD = 0.05) than the industry standard (0.4). When the industry standard cutoff of 0.4 was utilized, swab-sample sensitivity ranged from 20.0% to 55.6% over weeks 2 through 7 PI. Implications: Diagnosis of viremic animals using qPCR can be equivalently accomplished using any of the sampling methods. PRRS ELISA status can be determined using any of the sampling methods if an alternative S:P ratio cutoff is used

Beyond the Workplace: "Upstream" Business Practices and Labor Standards in the Global Electronics Industry

Despite decades of debate and efforts to improve global labor standards, multiple problems still persist. Whether arguing for a more active role for the state, persuading firms to adopt codes of conduct, improving monitoring and sanctioning processes or seeking a higher degree of commitment between supply chain actors, scholars still lack an adequate explanation for why labor problems do not show improvement. Existing theories, while they will help, are not sufficient to solve this issue because they are focused on the production side of markets—the result both of an intellectual and policy bias towards production and the tendency to look for solutions where problems occur. Using a case study of Hewlett-Packard’s (HP) supply chain, qualitative and quantitative data from field visits to plants in South East Asia and a unique dataset of HP’s code of conduct audits, we demonstrate that even under the most-likely conditions that favor previous theories of labor standards, code of conduct violations, in particular excess working hours, exhibit widespread persistence. Having explained this, we demonstrate that this persistence is the product of a set of policies and practices designed and implemented upstream by global buyers and their lead suppliers

Faculty Survey regarding the establishment of an ROTC program

An example of a survey sent to faculty regarding the establishment of an ROTC program.https://scholars.fhsu.edu/military_science_rotc_docs/1007/thumbnail.jp

Survival of Fishes in a Stormwater Retention Pond at the Watershed Nature Center, Edwardsville, Illinois

A study of the Upper Pond at the Edwardsville Watershed Nature Center (WNC) was conducted to discover the potential cause of fish kills in the small stormwater retention pond and to determine how the current populations of bluegill (Lepomis macrochirus), redear sunfish (Lepomis microlophus), common carp (Cyprinus carpio) and largemouth bass (Micropterus salmoides) can survive in the pond based on prevailing environmental conditions. Dissolved oxygen (DO) was measured from June 19 to December 5, 2019 at a site in the center of the open lake (4 m deep) and from a dock near the shore (1.1 m deep). Water temperature was measured intermittently at both sites from June 19 to November 4. In the open lake, oxygen levels reached a peak of 11.6 mg/L at the surface on July 2. Below 2.5 m DO remained less than 1.5 mg/L until Oct. 8 when it slowly began to rise reaching a high of 10.8 on Nov. 20. The dock station had similar oxygen levels. Temperature varied from a high of 31.2 °C on July 21 to a low of 6.5° C on November 3. The low DO in the pond results from a nearly continuous cover of duckweed (Lemna sps) which prevents interchange of oxygen with the atmosphere. It is likely that the low oxygen levels select for fish species that are physiologically and behaviorally capable of surviving hypoxia

Numerical Modeling of Flow and Water Quality in an Oxbow Lake in the Mississippi Delta

Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchive