Bestimmung der Bioabbaubarkeit von nicht wasserlöslichen Flüssigkeiten (Schmieröle etc.) nach CEC L-33-A-94

The use of biodegradable lubricants as substitutes for lubricants based on mineral oils is necessary in areas where an impact on ecosystems is inevitable and cannot be excluded. These are applications in which a partial loss of lubricant into the environment occurs, e.g. chain saw oils, two-stroke oils for outboard motors, and hydraulic oils, which are used in sensitive areas as dredging-machines near rivers or ground water sources. The use of commercially available biodegradable base liquids for lubricants is discussed and several current examples are given. These water-insoluble products are frequently examined with the CEC test that can be used for a rough determination of the biodegradability. The development and application of this method has a long tradition at the EMPA Dübendorf. Experimental details, limits, advantages, and disadvantages will be discussed in this paper. Longterm measurements with the calibrating oils RL 130 and RL 110 together with results from a biodegradation study of several hydraulic fluids that are used in agricultural machinery are presented

A class II MHC-targeted vaccine elicits immunity against SARS-CoV-2 and its variants

The pandemic caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has resulted in over 100 million infections and millions of deaths. Effective vaccines remain the best hope of curtailing SARS-CoV-2 transmission, morbidity, and mortality. The vaccines in current use require cold storage and sophisticated manufacturing capacity, which complicates their distribution, especially in less developed countries. We report the development of a candidate SARS-CoV-2 vaccine that is purely protein based and directly targets antigen-presenting cells. It consists of the SARS-CoV-2 Spike receptor-binding domain (Spik

Peripheral Nervous System Genes Expressed in Central Neurons Induce Growth on Inhibitory Substrates

Trauma to the spinal cord and brain can result in irreparable loss of function. This failure of recovery is in part due to inhibition of axon regeneration by myelin and chondroitin sulfate proteoglycans (CSPGs). Peripheral nervous system (PNS) neurons exhibit increased regenerative ability compared to central nervous system neurons, even in the presence of inhibitory environments. Previously, we identified over a thousand genes differentially expressed in PNS neurons relative to CNS neurons. These genes represent intrinsic differences that may account for the PNS’s enhanced regenerative ability. Cerebellar neurons were transfected with cDNAs for each of these PNS genes to assess their ability to enhance neurite growth on inhibitory (CSPG) or permissive (laminin) substrates. Using high content analysis, we evaluated the phenotypic profile of each neuron to extract meaningful data for over 1100 genes. Several known growth associated proteins potentiated neurite growth on laminin. Most interestingly, novel genes were identified that promoted neurite growth on CSPGs (GPX3, EIF2B5, RBMX). Bioinformatic approaches also uncovered a number of novel gene families that altered neurite growth of CNS neurons

Isoform Diversity and Regulation in Peripheral and Central Neurons Revealed through RNA-Seq

To fully understand cell type identity and function in the nervous system there is a need to understand neuronal gene expression at the level of isoform diversity. Here we applied Next Generation Sequencing of the transcriptome (RNA-Seq) to purified sensory neurons and cerebellar granular neurons (CGNs) grown on an axonal growth permissive substrate. The goal of the analysis was to uncover neuronal type specific isoforms as a prelude to understanding patterns of gene expression underlying their intrinsic growth abilities. Global gene expression patterns were comparable to those found for other cell types, in that a vast majority of genes were expressed at low abundance. Nearly 18% of gene loci produced more than one transcript. More than 8000 isoforms were differentially expressed, either to different degrees in different neuronal types or uniquely expressed in one or the other. Sensory neurons expressed a larger number of genes and gene isoforms than did CGNs. To begin to understand the mechanisms responsible for the differential gene/isoform expression we identified transcription factor binding sites present specifically in the upstream genomic sequences of differentially expressed isoforms, and analyzed the 3′ untranslated regions (3′ UTRs) for microRNA (miRNA) target sites. Our analysis defines isoform diversity for two neuronal types with diverse axon growth capabilities and begins to elucidate the complex transcriptional landscape in two neuronal populations

Coding of acoustic particle motion by utricular fibers in the sleeper goby, Dormitator latifrons

It is unknown whether the fish utricle contributes to directional hearing. Here, we report response properties of single utricular fibers in a teleost fish (Dormitator latifrons) to linear accelerations at various stimulus frequencies and axes. Characteristic frequencies ranged from ≤50–400 Hz (median=80 Hz), and best frequencies shifted from 50 to 250 Hz with stimulus level. Best sensitivity of utricular fibers was distributed from −70 to −40 dB re: 1 g (mean=−52 dB), which is about 30 dB less sensitive than saccular fibers. Q50% fell between 0.16 and 11.50 (mean=2.04) at 15 dB above threshold. We observed temporal response patterns of entrained phase-locking, double phase-locking, phase-locked bursting, and non-phase-locked bursting. Most utricular fibers were directionally selective with various directional response profiles, and directional selectivity was stimulus-level dependent. Horizontal best-response axes were distributed in a 152° range while mid-sagittal best-response axes were clustered around the fish longitudinal axis, which is consistent with the horizontal orientation of the utricle and morphological polarizations of utricular hair cells. Therefore, results of this study indicate that the utricle in this vertebrate plays an auditory role in azimuth and that utricular fibers extend the response dynamic range of this species in directional hearing

Acoustic response properties of lagenar nerve fibers in the sleeper goby, Dormitator latifrons

Auditory and vestibular functions of otolithic organs vary among vertebrate taxa. The saccule has been considered a major hearing organ in many fishes. However, little is known about the auditory role of the lagena in fishes. In this study we analyzed directional and frequency responses from single lagenar fibers of Dormitator latifrons to linear accelerations that simulate underwater acoustic particle motion. Characteristic frequencies of the lagenar fibers fell into two groups: ≤50 Hz and 80–125 Hz. We observed various temporal response patterns: strong phase-locking, double phase-locking, phase-locked bursting, and non-phase-locked bursting. Some bursting responses have not been previously observed in vertebrate otolithic nerve fibers. Lagenar fibers could respond to accelerations as small as 1.1 mm s−2. Like saccular fibers, lagenar fibers were directionally responsive and decreased directional selectivity with stimulus level. Best response axes of the lagenar fibers clustered around the lagenar longitudinal axis in the horizontal plane, but distributed in a diversity of axes in the mid-sagittal plane, which generally reflect morphological polarizations of hair cells in the lagena. We conclude that the lagena of D. latifrons plays a role in sound localization in elevation, particularly at high stimulus intensities where responses of most saccular fibers are saturated

Drug discovery technologies: Caenorhabditis elegans

39 páginas, 3 figuras, 5 tablas.Helminthiasis is one of the gravest problems worldwide. There is a growing concern on less available anthelmintics and the emergence of resistance creating a major threat to human and livestock health resources. Novel and broad-spectrum anthelmintics are urgently needed. The free-living nematode Caenorhabditis elegans could address this issue through automated high-throughput technologies for the screening of large chemical libraries. This review discusses the strong advantages and limitations for using C elegans as a screening method for anthelmintic drug discovery. C elegans is the best model available for the validation of novel effective drugs in treating most, if not all, helminth infections, and for the elucidation the mode of action of anthelmintic candidates. This review also focuses on available technologies in the discovery of anthelmintics published over the last 15 years with particular attention to high-throughput technologies over conventional screens. On the other hand, this review highlights how combinatorial and nanomedicine strategies could prolong the use of anthelmintics and control resistance problems.Consejería de Educación, Junta de Castilla y León, Grant/Award Number: LE020P17; Ministerio de Economía y Competitividad, Grant/Award Numbers: AGL2016‐79813‐C2‐1R, RYC‐2015‐18368; European and Developing Countries Clinical Trials Partnership, Grant/Award Number: RIA2017NCT‐184

Guidelines for anaesthesiologist specialist training in pain medicine

The Section and Board of Anaesthesiology of the European Union of Medical Specialists aims (EUMS/UEMS) at harmonization of training of anaesthesiologists and at improvement of patient care throughout Europe. Pain medicine is considered to be an area of expertise in anaesthesiology although exclusivity is not claimed. The Section and Board has approved both a core syllabus for pain medicine to be part of the specialist training in anaesthesiology and an additional qualification in pain medicine following the completion of a 5 yr basic specialty training in anaesthesiology. These proposals were prepared by the Working Party on Pain Medicine of the Section and Board. It considers a multidisciplinary approach to pain to contribute to quality in care and has taken the initiative to set up a Multidisciplinary Joint Committee on Pain Medicine within the EUMS/UEMS, for which these guidelines define the area of expertise of anaesthesiology