Localized self-heating in large arrays of 1D nanostructures.

One dimensional (1D) nanostructures offer a promising path towards highly efficient heating and temperature control in integrated microsystems. The so called self-heating effect can be used to modulate the response of solid state gas sensor devices. In this work, efficient self-heating was found to occur at random networks of nanostructured systems with similar power requirements to highly ordered systems (e.g. individual nanowires, where their thermal efficiency was attributed to the small dimensions of the objects). Infrared thermography and Raman spectroscopy were used to map the temperature profiles of films based on random arrangements of carbon nanofibers during self-heating. Both the techniques demonstrate consistently that heating concentrates in small regions, the here-called "hot-spots". On correlating dynamic temperature mapping with electrical measurements, we also observed that these minute hot-spots rule the resistance values observed macroscopically. A physical model of a random network of 1D resistors helped us to explain this observation. The model shows that, for a given random arrangement of 1D nanowires, current spreading through the network ends up defining a set of spots that dominate both the electrical resistance and power dissipation. Such highly localized heating explains the high power savings observed in larger nanostructured systems. This understanding opens a path to design highly efficient self-heating systems, based on random or pseudo-random distributions of 1D nanostructures.

Non-phthalate plasticizers in German daycare centers and human biomonitoring of DINCH metabolites in children attending the centers (LUPE 3).

Plasticizers have been widely used for decades as additives in diverse applications, including consumer and building products, toys, cables, and floorings. Due to toxicological concerns and restrictions of different dialkyl ortho-phthalates, other plasticizers have been increasingly used in recent years. Therefore, di-isononyl cyclohexane-1,2-dicarboxylate (DINCH), di(2-ethylhexyl) terephthalate (DEHT), di(2-ethylhexyl) adipate (DEHA), acetyl tri-n-butyl citrate (ATBC), and trioctyl trimellitate (TOTM) plasticizer levels in indoor air and dust samples from 63 daycare centers in Germany were measured. Moreover, the urine samples of 208 children who attend 27 of these facilities were analyzed for the presence of four DINCH metabolites. DINCH, DEHT, and DEHA were present in indoor air with median values of 108 ng/m(3), 20 ng/m(3), and 34 ng/m(3), respectively. Median values of 302 mg/kg for DINCH, 49 mg/kg for DEHA, 40 mg/kg for DEHT, and 24 mg/kg ATBC were found in dust. In the urine samples, the three secondary metabolites of DINCH were observed with median values (95th percentiles) of 1.7 µg/l (10.0 µg/l) for OH-MINCH, 1.5 µg/l (8.0 µg/l) for oxo-MINCH, and 1.1 µg/l (6.1 µg/l) for cx-MINCH. Overall, these metabolite levels are orders of magnitude lower than the current HBM I values set by the German Human Biomonitoring Commission. Using general exposure assumptions, the intake resulting from dust ingestion and inhalation is low for children. The total daily DINCH intake calculated from biomonitoring data was 0.5 µg/kg b.w. using median values and 9.8 µg/kg b.w. as the maximum value. At present, non-phthalate plasticizers, especially DINCH, can be found in considerable amounts in dust samples from daycare centers and as DINCH metabolites in the urine of children. In relation to previous studies, the concentrations of DINCH in dust and urine have an increasing time trend. Compared with tolerable daily intake values, the total daily intake of DINCH reached only 1% of its maximum value to date; however, due to its increased use, higher exposure of DINCH is expected in the future.

Bis-(2-propylheptyl)phthalate (DPHP) metabolites emerging in 24h urine samples from the German Environmental Specimen Bank (1999-2012).

Bis-(2-propylheptyl)-phthalate (DPHP) has been introduced as a substitute for other high molecular weight phthalates primarily used in high temperature applications (e.g. cable wires, roofing membranes). The aim of this study was to investigate how the increased usage of DPHP is reflected in urine samples collected over the last 14 years and to evaluate the current extent of exposure. We analyzed 300 urine samples (24h voids) from the German Environmental Specimen Bank collected in the years 1999, 2003, 2006, 2009 and 2012, 60 samples per year, from 30 male and 30 female volunteers (age: 20-30 years) for three specific, secondary oxidized DPHP metabolites (with hydroxy, oxo and carboxy modifications of the alkyl side chain). We determined DPHP metabolites with a previously developed GC-HRMS method, enabling us to unambiguously distinguish DPHP metabolites from co-eluting, structurally isomeric di-iso-decyl phthalate (DIDP) metabolites. All samples were blinded before analysis. We detected no DPHP metabolites in urine samples from the years 1999, 2003 and 2006. Thereafter, detection rates increased from 3.3% in 2009 to 21.7% in 2012. Mono-oxo-propylheptylphthalate (oxo-MPHP) was the most abundant metabolite, with concentrations between

Metabolism and elimination of N-ethyl-2-pyrrolidone (NEP) in human males after oral dosage.

N-Ethyl-2-pyrrolidone (NEP) is an industrial solvent that has been increasingly used to substitute N-methyl-2-pyrrolidone. NEP is under scrutiny in scientific and regulatory committees because of developmental toxic and teratogenic effects in rodents. The two postulated NEP metabolites 5-hydroxy-N-ethyl-2-pyrrolidone (5-HNEP) and 2-hydroxy-N-ethylsuccinimide (2-HESI) have recently been detected in urine samples from the general population. Thus, the toxicokinetic characterization of these biomarkers of NEP exposure in humans is of relevance both in the occupational as well as the environmental field. We orally dosed 20.9 mg NEP to three male volunteers. These volunteers collected all their urine samples over a period of 4 days post dose. In these samples we identified and quantified the above postulated NEP metabolites 5-HNEP and 2-HESI and determined their urinary elimination kinetics and their metabolic conversion factors. After 4 days we recovered 50.7 % of the dose as these two metabolites in urine, 29.1 % as 5-HNEP and 21.6 % as 2-HESI. The largest share of 5-HNEP was excreted within 24 h post dose, while the major share of 2-HESI was excreted on day 2 post dose. We estimated an elimination half-time for 5-HNEP of approx. 7 h and for 2-HESI of approx. 22-27 h. While the elimination of 5-HNEP was basically finished 72 h post dose, significant amounts of 2-HESI were still eliminated after 96 h. Both biomarkers can now be used in human biomonitoring studies to extrapolate from urinary measurements to the NEP dose taken up and thus to evaluate the risk caused by exposure to this chemical.

[Chronic non-cancer-related pain. Long-term treatment with rapid-release and short-acting opioids in the context of misuse and dependency]. / Chronische nichttumorbedingte Schmerzen. Langzeitbehandlung mit schnell freisetzenden und kurz wirksamen Opioiden im Kontext von Missbrauch und Abhängigkeit.

Annually published data show a continual increase in the volume of opioid prescriptions in Germany, thus indicating an intensification of opioid therapy. The majority of opioids are prescribed to treat chronic non-cancer-related pain. On the basis of current guidelines, as well as in terms of the lack of data regarding long-term use of opioids and their effectiveness beyond a period of 3 months, this development must be viewed critically. With reference to four case reports, we discuss and evaluate opioid therapy in relation to medication misuse and the development of drug dependency. Particular emphasis is placed on the administration of rapid-release and short-acting opioid preparations, which we consider to be particularly problematic.

Co-expression of Hif1alpha and CAIX is associated with poor prognosis in oral squamous cell carcinoma patients.

BACKGROUND: This study investigates the prognostic impact of the expression of hypoxia-inducible factor 1alpha (Hif1alpha) and carbonic anhydrase IX (CAIX) detected by immunohistochemistry in oral squamous cell carcinoma (OSCC). METHODS: Statistical analysis of immunohistochemical results with clinical parameters including survival outcomes was performed for 80 OSCC patients. RESULTS: Patients with a low expression of both proteins survived on average 54.8 months, whereas those with an increased expression of Hif1alpha in their tumors combined with a low expression of CAIX survived on average only 37.6 months (P = 0.026). In multivariate Cox's regression hazard analysis, again patients with a low expression of Hif1alpha/CAIX had the best prognosis, whereas patients with increased Hif1alpha and low CAIX expression carried a 4.97-fold increased risk of tumor-related death (P = 0.042). CONCLUSION: A co-detection of low Hif1alpha/CAIX expression is significantly correlated with a better prognosis for OSCC patients, which may have implications for therapy options for these patients.

[Evaluation of a multimodal pain therapy at the University Pain Centre Dresden]. / Evaluation einer multimodalen Schmerztherapie am UniversitätsSchmerzCentrum Dresden.

BACKGROUND: Data of a multimodal pain management program of the multidisciplinary pain management centre at the University Hospital of Dresden is presented. Over a period of 4 weeks, supplemented by an additional week 3 months later (booster week), patients with chronic pain of different origins are being treated in groups of 12. Based on the principles of the biopsychosocial pain model and the idea of functional restoration, the program is dedicated for pain patients where outpatient treatment was insufficient. METHODS: The program was evaluated on the basis of pain intensity (NRS), pain disability (PDI), fear and depression (HADS-D), catastrophizing (CSQ) and health-related quality of life and vitality (SF-36). The data were collected at the beginning and end of the initial 4 week treatment period, at the end of the booster period as well as 6 and 12 months after the end of active treatment. RESULTS: A total of 189 patients were included in the program in the period from January 2006 until August 2008. All outcome parameter showed statistically significant improvements with small to high effect sizes (ES 0.20-0.95). The results stayed stable even 1 year after the treatment. The highest effect sizes were found in catastrophizing (ES 0.86) and average pain intensity (ES 0.95). The primary pain diagnosis (e. g. low back pain versus headache) had no impact on treatment outcome. CONCLUSION: Significant and clinically relevant improvements could be achieved with the multimodal pain management program in groups of 12 patients. The results were stable over a time period of 1 year. Pain diagnosis had no impact on the outcome.

Yield reduction and mycotoxin contamination of wheat due toFusarium culmorum.

The inoculation of wheat ears with 27 isolates ofFusarium culmorum in growth stage 65 reduced 1000-grain weights by 14 to 61%. For the phytopathological characterisation of isolates the virulence on primary wheat leaves and the growth rate an potato-dextrose-agar were assessed. Deoxynivalenol-producing isolates ofF. culmorum reduced the 1000-grain weight more than nivalenol-producing isolates.

[A comparative study of total protein and albumin in man, monkey, dog and rat employing different analytical methods (author's transl)]. / Vergleichende Untersuchungen zur Bestimmung von Gesamtprotein und Albumin im Serum von Mensch, Affe, Hund und Ratte

In the present study, serum albumin was determined colorimetrically in three animal species and in man with the help of four currently used dye-reagents (protein binding reagents). The results were compared with those obtained from corresponding electrophoretic and biuret determinations, using Versatol as a standard-control throughout. Using 2-(4-hydroxyazobenzene)-benzoic acid and bromocresol purple as reagent for the albumin determinations, species-specific differences from the electrophoretic results were found. No such differences occurred with bromo-cresol green, except in rats. There was no significant difference in albumin concentrations between man, monkeys and rats. Total protein concentration was only similar in man and monkeys.