Metazoans of redoxcline sediments in Mediterranean deep-sea hypersaline anoxic basins

Background: The deep-sea hypersaline anoxic basins (DHABs) of the Mediterranean (water depth similar to 3500 m) are some of the most extreme oceanic habitats known. Brines of DHABs are nearly saturated with salt, leading many to suspect they are uninhabitable for eukaryotes. While diverse bacterial and protistan communities are reported from some DHAB haloclines and brines, loriciferans are the only metazoan reported to inhabit the anoxic DHAB brines. Our goal was to further investigate metazoan communities in DHAB haloclines and brines. Results: We report observations from sediments of three DHAB (Urania, Discovery, L'Atalante) haloclines, comparing these to observations from sediments underlying normoxic waters of typical Mediterranean salinity. Due to technical difficulties, sampling of the brines was not possible. Morphotype analysis indicates nematodes are the most abundant taxon; crustaceans, loriciferans and bryozoans were also noted. Among nematodes, Daptonema was the most abundant genus; three morphotypes were noted with a degree of endemicity. The majority of rRNA sequences were from planktonic taxa, suggesting that at least some individual metazoans were preserved and inactive. Nematode abundance data, in some cases determined from direct counts of sediments incubated in situ with CellTracker (TM) Green, was patchy but generally indicates the highest abundances in either normoxic control samples or in upper halocline samples; nematodes were absent or very rare in lower halocline samples. Ultrastructural analysis indicates the nematodes in L'Atalante normoxic control sediments were fit, while specimens from L'Atalante upper halocline were healthy or had only recently died and those from the lower halocline had no identifiable organelles. Loriciferans, which were only rarely encountered, were found in both normoxic control samples as well as in Discovery and L'Atalante haloclines. It is not clear how a metazoan taxon could remain viable under this wide range of conditions. Conclusions: We document a community of living nematodes in normoxic, normal saline deep-sea Mediterranean sediments and in the upper halocline portions of the DHABs. Occurrences of nematodes in mid-halocline and lower halocline samples did not provide compelling evidence of a living community in those zones. The possibility of a viable metazoan community in brines of DHABs is not supported by our data at this time

Integrated geophysical-petrological modeling of lithosphere-asthenosphere boundary in central Tibet using electromagnetic and seismic data

We undertake a petrologically driven approach to jointly model magnetotelluric (MT) and seismic surface wave dispersion (SW) data from central Tibet, constrained by topographic height. The approach derives realistic temperature and pressure distributions within the upper mantle and characterizes mineral assemblages of given bulk chemical compositions as well as water content. This allows us to define a bulk geophysical model of the upper mantle based on laboratory and xenolith data for the most relevant mantle mineral assemblages and to derive corresponding predicted geophysical observables. One-dimensional deep resistivity models were derived for two groups of MT stations. One group, located in the Lhasa Terrane, shows the existence of an electrically conductive upper mantle layer and shallower conductive upper mantle layer for the other group, located in the Qiangtang Terrane. The subsequent one-dimensional integrated petrological-geophysical modeling suggests a lithosphere-asthenosphere boundary (LAB) at a depth of 80¿120 km with a dry lithosphere for the Qiangtang Terrane. In contrast, for the Lhasa Terrane the LAB is located at about 180 km but the presence of a small amount of water in the lithospheric mantle (<0.02 wt%) is required to fit the longest period MT responses. Our results suggest two different lithospheric configurations beneath the southern and central Tibetan Plateau. The model for the Lhasa Terrane implies underthrusting of a moderately wet Indian plate. The model for the Qiangtang Terrane shows relatively thick and conductive crust and implies thin and dry Tibetan lithosphere.Peer Reviewe

Fouryear review of admissions to a South African regional hospital general surgery department

Background. There are limited published data describing surgical admissions at a regional hospital level in the South African (SA) context.Objectives. To retrospectively review data from an electronic discharge summary  database at a regional SA hospital from 2012 to 2016 to describe the burden of surgical disease by analysing characteristics of the patients admitted.Methods. All discharge summary records for the 4-year period were reviewed after extraction from a database created for the surgery department. Admissions were classified into 5 types: (i) elective surgery or investigations (ESI); (ii) trauma; (iii) burns; (iv) non-traumatic surgical emergencies (NTSE); and (v) unplanned readmission within 30 days. Other variables reviewed were demographic data, the International Statistical Classification of Diseases and Related Health Problems – Version 10 (ICD-10) diagnosis; area of origin; and outcome (death, tertiary referral, discharge). Data were subgrouped into 12-month periods to facilitate trend analysis.Results. Discharge summaries (N=9 805) over the 4-year study period were assessed and 9 799 were included in the analysis. All data were entered by the attending medical personnel. A total of 5 647 male patients (57.6%) and 4 152 female patients (42.4%) were admitted, with a mean age of 43.3 years (95% confidence interval (CI) 43.0 - 43.8) and a mean length of stay of 4.9 days (95% CI 4.7 - 5.1). Male patients comprised a larger proportion of trauma (83.7%) and burn (63.9%) admissions. The mean length of stay ranged from 3.5 days for elective patients to 9.1 days for burn patients. The most common diagnoses for emergency admissions were appendicitis, peripheral vascular disease and peptic ulcer disease. Common diagnoses for elective admissions were gallstone disease, inguinal hernia, anal fistulas/fissures, and ventral and incisional hernia. The most common cancer diagnoses were of the colorectum, oesophagus, breast and stomach. The overall mortality rate was 2.2%, and highest by subtype was burn patients (6.3%). Trend analysis showed a statistically significant increase in admission for NTSE (p=0.019), trauma (p&lt;0.001) and 30-day readmission rates (p&lt;0.001), with a decrease in admissions for ESI (p=0.001) over the 4 years.Conclusions. A precise understanding of the burden of disease profile is essential for national, provincial and district budgeting and resource allocation. Ongoing surveillance such as that performed in the study provides this critical information

Absolute frequency measurement of the magnesium intercombination transition 1S0→3P1^1S_0 \to ^3P_1

We report on a frequency measurement of the $(3s^2)^1S_0\to(3s3p)^3P_1$ clock transition of $^{24}$Mg on a thermal atomic beam. The intercombination transition has been referenced to a portable primary Cs frequency standard with the help of a femtosecond fiber laser frequency comb. The achieved uncertainty is $2.5\times10^{-12}$ which corresponds to an increase in accuracy of six orders of magnitude compared to previous results. The measured frequency value permits the calculation of several other optical transitions from $^1S_0$ to the $^3P_J$-level system for $^{24}$Mg, $^{25}$Mg and $^{26}$Mg. We describe in detail the components of our optical frequency standard like the stabilized spectroscopy laser, the atomic beam apparatus used for Ramsey-Bord\'e interferometry and the frequency comb generator and discuss the uncertainty contributions to our measurement including the first and second order Doppler effect. An upper limit of $3\times10^{-13}$ in one second for the short term instability of our optical frequency standard was determined by comparison with a GPS disciplined quartz oscillator.Comment: 8 pages, 8 figure

From Teamchef Arminius to Hermann Junior: glocalised discourse about a national foundation myth

If for much of the nineteenth and twentieth centuries, the ‘Battle of the Teutoburg Forest’, fought in 9 CE between Roman armies and Germanic tribes, was predominantly a reference point for nationalist and chauvinist discourses in Germany, the first decade of the twenty-first century has seen attempts to link public remembrance with local/regional identities on the one hand and international/intercultural contact on the other. In the run up to and during the ‘anniversary year’ of 2009, German media, sports institutions and various other official institutions articulating tourist, economic and political interests attempted to create a new ‘glocalised’ version of the public memory of the Teutoburg battle. Combining methods of Cognitive Linguistics and Critical Discourse Analysis, the paper analyses the narrative and argumentative topoi employed in this re-orientation of public memory, with a special emphasis on hybrid, post-national identity-construction. Das zweitausendjährige Gedenkjahr der „Schlacht im Teutoburger Wald“ im Jahr 2009 bot eine günstige Gelegenheit, die bis in die zweite Hälfte des 20. Jahrhunderts dominante Tradition nationalistisch–chauvinistischer Deutungen des Sieges von germanischen Stämmen über drei römische Legionen zu korrigieren und zu überwinden. Der Aufsatz analysiert mit Hilfe diskurslinguistischer Methoden die Anstrengungen regionaler Institutionen und Medien, die nationale Vereinnahmung des historischen Gedenkens kritisch zu thematisieren sowie neue, zum eine lokal situierte, zum andern international orientierte Identifikationsangebote anzubieten. Die Analyse zeigt, dass solche „de-nationalisierten“ Identifikationsangebote zwar teilweise auch früher verwendet wurden, aber heutzutage rekontextualisiert und auf innovative Weise in den Vordergrund gestellt werden

Comportamento de triticale e trigo dos cerrados brasileiros na moagem e na produção industrial de pães, biscoitos, bolos e massas alimentícias.

Foram caracterizados os comportamentos de triticale e de trigo, procedentes dos cerrados brasileiros, na moagem e a qualidade das farinhas na produção industrial de pães, biscoitos, bolos e massas alimentícias. O triticale (P. H. 73,2) foi moído sem condicionamento, obtendo-se 72,6% de extração sendo 39,0% de farinha especial e 61,0% de farinha comum. O trigo (P.H. 77,9) foi moído com 15% de umidade, obtendo-se 76,5% de extração sendo 42,6% de farinha especial e 57,4% de farinha comum. Os tempos de moagem/ton de grãos foram praticamente iguais. Pão francês, com 10 ou 20% de farinha de triticale, apresentou qualidade igual ao padrão elaborado semente com farinha de trigo comercial. Pão industrial tipo americano fabricado com 80% de farinha de trigo e 20% de triticale foi considerado bom quando se reduziu o tempo de fermentação. Foram fabricados biscoitos fermentados, salgados, doces secos e amanteigados e concluiu-se que em qualquer um destes tipos pode-se utilizar exclusivamente farinha de triticale ou de trigo dos cerrados, sendo que os biscoitos de triticale, quando comparados com o padrão industrial, apresentaram-se sempre iguais ou superiores. Bolos, com 50% de farinha de triticale e de farinha de triticale, foram considerados superiores, quanto ao sabor, em relação ao padrão industrial. Produziram-se massas alimentícias do tipo espaguete e ninho, com 20% de farinha de triticale e 80% de farinha de trigo especial (cerrados). Os tempos de cozimento, para os dois tipos de massa, foram iguais ao do padrão industrial. Quanto ao aumento de peso e volume, pelo cozimento, os espaguetes não apresentaram diferença, enquanto que, para o tipo ninho, houve diminuição significativa quando se usou farinha de triticale.bitstream/item/65366/1/CTAA-DOCUMENTOS-04-BOLETIM-DE-PESQUISA-NUMERO-004-COMPORTAMENTODE-TRITICALE-E-TRIGO-DOS-CERRADOS-.pd

Simulative Investigations of the Influence of Surface Indentations on Residual Stresses on Inner Raceways for Roller Element Bearings

Resource-efficient machine elements are in the focus of current research. One of the most widely used machine elements are roller bearings. Thus, the optimization of bearings and their tribological properties promises to result in significant resource savings. Special focus is set on the bearing fatigue life, which may be significantly reduced by indentations on the raceways. The reduction in fatigue life can be caused by processes such as rolling over particles or by brinelling. These processes induce local stress peaks and lead to elastic-plastic deformations of the raceways. During the subsequent operation, the pile up of material around the indentations is flattened and hence the residual stresses change. Inside these so called shoulders stress pealcs, residual stresses and hardening effects occur possibly resulting in crack initiation, crack growth under cyclic loading, and eventually spalling of material. For deeper and more sharp-edged indentations the bearing fatigue life is reduced more. To quantify the influence of an indentation on the bearing rating life a calculation model was developed based on the approach of IOANNIDES, BERGLING and GABELLI. For this, a 3D-FE model is used to calculate the three dimensional stress fields by superposition of residual and load stresses

Stimulus - response curves of a neuronal model for noisy subthreshold oscillations and related spike generation

We investigate the stimulus-dependent tuning properties of a noisy ionic conductance model for intrinsic subthreshold oscillations in membrane potential and associated spike generation. On depolarization by an applied current, the model exhibits subthreshold oscillatory activity with occasional spike generation when oscillations reach the spike threshold. We consider how the amount of applied current, the noise intensity, variation of maximum conductance values and scaling to different temperature ranges alter the responses of the model with respect to voltage traces, interspike intervals and their statistics and the mean spike frequency curves. We demonstrate that subthreshold oscillatory neurons in the presence of noise can sensitively and also selectively be tuned by stimulus-dependent variation of model parameters.Comment: 19 pages, 7 figure

Using ordinal logistic regression to evaluate the performance of laser-Doppler predictions of burn-healing time

Background Laser-Doppler imaging (LDI) of cutaneous blood flow is beginning to be used by burn surgeons to predict the healing time of burn wounds; predicted healing time is used to determine wound treatment as either dressings or surgery. In this paper, we do a statistical analysis of the performance of the technique. Methods We used data from a study carried out by five burn centers: LDI was done once between days 2 to 5 post burn, and healing was assessed at both 14 days and 21 days post burn. Random-effects ordinal logistic regression and other models such as the continuation ratio model were used to model healing-time as a function of the LDI data, and of demographic and wound history variables. Statistical methods were also used to study the false-color palette, which enables the laser-Doppler imager to be used by clinicians as a decision-support tool. Results Overall performance is that diagnoses are over 90% correct. Related questions addressed were what was the best blood flow summary statistic and whether, given the blood flow measurements, demographic and observational variables had any additional predictive power (age, sex, race, % total body surface area burned (%TBSA), site and cause of burn, day of LDI scan, burn center). It was found that mean laser-Doppler flux over a wound area was the best statistic, and that, given the same mean flux, women recover slightly more slowly than men. Further, the likely degradation in predictive performance on moving to a patient group with larger %TBSA than those in the data sample was studied, and shown to be small. Conclusion Modeling healing time is a complex statistical problem, with random effects due to multiple burn areas per individual, and censoring caused by patients missing hospital visits and undergoing surgery. This analysis applies state-of-the art statistical methods such as the bootstrap and permutation tests to a medical problem of topical interest. New medical findings are that age and %TBSA are not important predictors of healing time when the LDI results are known, whereas gender does influence recovery time, even when blood flow is controlled for. The conclusion regarding the palette is that an optimum three-color palette can be chosen 'automatically', but the optimum choice of a 5-color palette cannot be made solely by optimizing the percentage of correct diagnoses