Reduced bending and scattering losses in new optical `double-ridge' waveguide

A new type of waveguide is proposed combining a low and a high ridge. Experiments at lambda =632.8 nm show an excess loss of 0.6 dB for a 90 degrees bend with R=50 mu m in SiO/sub 2/ cladded Al/sub 2/O/sub 3/, and showing reduced scattering losses compared with a conventional ridge waveguid

Development and validation of PRE-DELIRIC (PREdiction of DELIRium in ICu patients) delirium prediction model for intensive care patients: observational multicentre study

Objectives To develop and validate a delirium prediction model for adult intensive care patients and determine its additional value compared with prediction by caregivers

Predicting success of vagus nerve stimulation (VNS) from interictal EEG

AbstractPurposeVagus nerve stimulation (VNS) has shown to be an effective treatment for drug resistant epilepsy in numerous patients, however, not in all. It is still not possible to predict which patients will profit from VNS. In this pilot study, we explore predictive interictal EEG features for seizure reduction after VNS.Methods19 Patients with medically refractory epilepsy and an implanted VNS system were included. Interictal EEG registrations, recorded before implantation, were retrospectively analysed. A quantative symmetry measure, the pair wise derived brain symmetry index (pdBSI), was tested to predict VNS outcome. Reduction in seizure frequency was used to define the responders.Results10 Patients did respond to VNS, of whom 7 patients had a seizure reduction of at least 50% in a follow-up period of 2 years. On average, we find higher pdBSI values for delta, theta, alpha and beta bands for non-responders than for responders. The average pdBSI of the theta and alpha bands could significantly discriminate between responders and non-responders.ConclusionIn this study, quantifying EEG symmetry using the pdBSI shows promising results in predicting the reduction of seizure frequency after VNS treatment

'Nurses' self-management support to hospitalised patients: a scoping review

Aims and Objectives: To review the current literature to map and explore the interventions that have been considered or used by nurses to support adult patients' self-management during hospitalisation. Background: Nurses can play an important role in supporting patients' self-management. Currently, however, it is unclear how nurses perform this task during a patient's stay in hospital. Traditionally, nurses take the primary role in managing patients' care during hospitalisation. Ideally, patients should have the opportunity to continue applying strategies to manage their health conditions as much as possible while in the hospital. This can increase patients' self-efficacy and decrease unnecessary readmissions. Design: Scoping review informed by the Joanna Briggs Institute methodology. Methods: A database search was undertaken using Pubmed, CINAHL, Psycinfo, Cochrane, Embase and grey literature sources. Data from the included studies were mapped and summarised in a narrative summary. To synthesise the information that was given about each intervention, we conducted a qualitative inductive content analysis. Results are reported in accordance with the guidelines for reporting Items for systematic review and meta-analyses extension for scoping review (PRISMA-ScR) (Supplementary File 1). Results: 83 documents were included in this review. Based on the information about the interventions, three themes were identified: 'self-management support activities', 'focus of self-management support' and the 'intervention procedure'. Five self-management support activities can be distinguished: 'giving education', 'counselling and coaching', 'enhancing responsibility', 'engaging family-caregivers' and 'supporting transition from hospital to home'. The interventions focused on improving disease-related knowledge and on strengthening several self-management skills. Information about the procedure, development and the theoretical underpinning of the intervention was often limited. Conclusions: Most activities within the nursing interventions to support adult patients' self-management during hospitalisation are the part of regular nursing care. However, the transfer of responsibility for care task to the patient is relatively new. Further research could focus on developing interventions addressing all aspects of self-management and that are embedded in the patient's care pathway across settings.Pathophysiology, epidemiology and therapy of agein

Experience-based behavioral and chemosensory changes in the generalist insect herbivore Helicoverpa armigera exposed to two deterrent plant chemicals

Behavioral and electrophysiological responses of larvae of the polyphagous moth species Helicoverpa armigera to two plant-derived allelochemicals were studied, both in larvae that had been reared on a diet devoid of these compounds and in larvae previously exposed to these compounds. In dual-choice cotton leaf disk and pepper fruit disk arena assays, caterpillars reared on a normal artificial diet were strongly deterred by strychnine and strophanthin-K. However, caterpillars reared on an artificial diet containing strychnine were insensitive to strychnine and strophanthin-K. Similarly, caterpillars reared on an artificial diet containing strophanthin-K were also desensitized to both deterrent chemicals. Electrophysiological tests revealed that the deterrent-sensitive neurons in taste sensilla on the maxillae of caterpillars reared on each deterrent-containing diet displayed reduced sensitivity to the two chemicals compared with the caterpillars reared on normal diets. We conclude that the experience-dependent behavioral plasticity was partly based on the reduced sensitivity of taste receptor neurons and that the desensitization of taste receptor neurons contributed to the cross-habituation to the two chemicals

Olfactory receptors on the maxillary palps of small ermine moth larvae: evolutionary history of benzaldehyde sensitivity

In lepidopterous larvae the maxillary palps contain a large portion of the sensory equipment of the insect. Yet, knowledge about the sensitivity of these cells is limited. In this paper a morphological, behavioral, and electrophysiological investigation of the maxillary palps of Yponomeuta cagnagellus (Lepidoptera: Yponomeutidae) is presented. In addition to thermoreceptors, CO2 receptors, and gustatory receptors, evidence is reported for the existence of two groups of receptor cells sensitive to plant volatiles. Cells that are mainly sensitive to (E)-2-hexenal and hexanal or to (Z)-3-hexen-1-ol and 1-hexanol were found. Interestingly, a high sensitivity for benzaldehyde was also found. This compound is not known to be present in Euonymus europaeus, the host plant of the monophagous Yponomeuta cagnagellus, but it is a prominent compound in Rosaceae, the presumed hosts of the ancestors of Y. cagnagellus. To elucidate the evolutionary history of this sensitivity, and its possible role in host shifts, feeding responses of three Yponomeuta species to benzaldehyde were investigated. The results confirm the hypothesis that the sensitivity to benzaldehyde evolved during the ancestral shift from Celastraceae to Rosaceae and can be considered an evolutionary relict, retained in the recently backshifted Celastraceae-specialist Y. cagnagellus

Landomycins as glutathione-depleting agents and natural fluorescent probes for cellular Michael adduct-dependent quinone metabolism

Landomycins are angucyclines with promising antineoplastic activity produced by Streptomyces bacteria. The aglycone landomycinone is the distinctive core, while the oligosaccharide chain differs within derivatives. Herein, we report that landomycins spontaneously form Michael adducts with biothiols, including reduced cysteine and glutathione, both cell-free or intracellularly involving the benz[a]anthraquinone moiety of landomycinone. While landomycins generally do not display emissive properties, the respective Michael adducts exerted intense blue fluorescence in a glycosidic chain-dependent manner. This allowed label-free tracking of the short-lived nature of the mono-SH-adduct followed by oxygen-dependent evolution with addition of another SH-group. Accordingly, hypoxia distinctly stabilized the fluorescent mono-adduct. While extracellular adduct formation completely blocked the cytotoxic activity of landomycins, intracellularly it led to massively decreased reduced glutathione levels. Accordingly, landomycin E strongly synergized with glutathione-depleting agents like menadione but exerted reduced activity under hypoxia. Summarizing, landomycins represent natural glutathione-depleting agents and fluorescence probes for intracellular anthraquinone-based angucycline metabolism