How superhydrophobicity breaks down

A droplet deposited or impacting on a superhydrophobic surface rolls off easily, leaving the surface dry and clean. This remarkable property is due to a surface structure that favors the entrainment of air cushions beneath the drop, leading to the so-called Cassie state. The Cassie state competes with the Wenzel (impaled) state, in which the liquid fully wets the substrate. To use superhydrophobicity, impalement of the drop into the surface structure needs to be prevented. To understand the underlying processes, we image the impalement dynamics in three dimensions by confocal microscopy. While the drop evaporates from a pillar array, its rim recedes via stepwise depinning from the edge of the pillars. Before depinning, finger-like necks form due to adhesion of the drop at the pillar’s circumference. Once the pressure becomes too high, or the drop too small, the drop slowly impales the texture. The thickness of the air cushion decreases gradually. As soon as the water–air interface touches the substrate, complete wetting proceeds within milliseconds. This visualization of the impalement dynamics will facilitate the development and characterization of superhydrophobic surfaces.     

The Effect of Statins on Acute and Long-Term Outcome After Ischemic Stroke in the Elderly

BackgroundAlthough treatment with statins has produced beneficial effects when used as secondary prevention, its primary protective role is still somewhat controversial. Moreover, few studies have evaluated the effect of statins in older patients with stroke.ObjectiveThe aim was to investigate whether treatment with statins decreases stroke severity and/or improves survival and outcome after stroke in an older population.MethodsWe investigated the association between previous statin use and stroke severity (National Institutes of Health Stroke Scale [NIHSS]), as well as the effect of poststroke statin treatment on 12-month functional outcome (modified Rankin Scale [mRS] score) in 799 patients (mean age, 78 years), with acute ischemic stroke. The effect of statin treatment on survival was examined using the Cox proportional hazard model, after adjusting for relevant covariates.ResultsStatins did not decrease stroke severity and did not improve 30-day survival. However, both the 12-month survival (hazard ratio = 0.33; 95% CI, 0.20–to 0.54; P < 0.001) and the 12-month functional outcome (odds ratio = 2.09; 95% CI, 1.25–3.52; P = 0.005) were significantly better in the group treated with statins.ConclusionsSignificantly better survival and functional outcome were noted with poststroke statins at the end of the 12-month follow-up period. Statins seem to provide beneficial effects for the long-term functional outcome and survival in the elderly.     

Exercise Capacity and Quality of Life in Patients with Schizophrenia

The aim of this study was to resolve the relationship between physical capacity (PC) and quality of life (Qol) in schizophrenic patients and healthy controls. 31 patients (PG: 18 male, 13 female) and a control group (CG) of 50 healthy subjects (15 male, 35 female) were involved. PC was assessed as peak oxygen uptake [VO₂peak, (ml (min kg_KG)^?1)] and power output expressed as watts per kilogram (W kg^?1). Qol was assessed using the SF-36 questionnaire. Patients with schizophrenia showed reduced VO₂peak (male: PG 29 ± 5 vs. CG 44 ± 10; female: PG 21 ± 4 vs. CG 30 ± 8) and power output (male: PG 2.04 ± 0.47 vs. CG 3.43 ± 0.70; female PG 1.40 ± 0.28 vs. CG 2.43 ± 0.52). Scales of the SF-36 questionnaire were lower in the PG. While in the CG correlations were found between PC and several subscales of Qol, this was not the case in the PG. The restricted PC seen in the PG showed no relation to their subjectively assessed worsened Qol, which would indicate that schizophrenic patients evaluate limitations arising from this differently than healthy control subjects.     

Preliminary Psychometric Properties of the Verbal and Nonverbal Interaction Scale: An Observational Measure for Communication in Persons with Dementia

Little attention has been given to sociable/unsociable communication in persons with dementia despite the importance of these behaviors in maintaining engagement in marital relationships. An observational measure of verbal and nonverbal communication in persons with dementia (Verbal and Nonverbal Interaction Scale-CR) who were engaged in conversations with spouses was tested for reliability and validity. Married persons with dementia were video-recorded at home conversing with spouses over 10 weeks (N = 118 recordings). Reliability [inter-coder (.92), test-retest (r =.61-.77), internal consistency (α =.65 -.79)] were adequate. Following an intervention, the Verbal and Nonverbal Interaction Scale-CR predicted improved communication over 10 weeks. The ratio of sociable to unsociable communication improved by 4.46 points per session [β = 4.46, t(10) = 1.96, p =.039]. VNVIS-CR is recommended to describe sociable and unsociable communication in persons with dementia as they engage in conversations with spouses.     

Eye eccentricity modifies the perception of whole-body rotation

In order to explore the effect of gaze orientation on whole-body rotation perception, ten healthy participants were rotated in the dark while fixating on a visual target located either straight ahead or 15° to the right. A vestibular-memory contingent saccade paradigm was used to estimate the rotation perception. The results attest to the participants’ ability to accurately perceive their rotation, based solely on the intrinsic inputs (somesthetic and mainly vestibular), since the correlation between the imposed body rotation and the saccade amplitude was significant and positive. However, the rotation perception was less accurate and of lesser magnitude when the gaze was deviated in the opposite direction to the rotation than when it was either straight ahead or deviated in the direction of the rotation. This can be interpreted as the perceptual equivalent of Alexander’s law.     

Circulating adhesion molecules in allergic and non-allergic asthma

Circulating forms of adhesion molecules (intercellular-adhesion molecule-1 (ICAM-1), vascular cell adhesion molecule-1 (VCAM-1) and E-selectin ) are related to the turnover of these molecules on the cell surface. In contrast to the other molecules, the levels of E-selectin probably exclusively reflect the activity of endothelial cells. The aim of this study was to compare levels of circulating adhesion molecules in patients with allergic (AA) and non-allergic asthma (NA) and to relate the levels of soluble adhesion molecules to methacholine responsiveness and lung function. The study comprised 19 patients with AA, 15 patients with NA and 17 healthy subjects. Soluble adhesion molecules, spirometry, methacholine responsiveness and peak flow variability was measured. The group of patients with AA had higher levels of sE-selectin than the reference group (P=0.046). Serum levels of sE-selectin correlated significantly with bronchial responsiveness (r=0.76) and peak flow variability (r=0.75) (P<0.01) in the NA but not in the AA group. All adhesion molecules in AA (P<0.05-<0.001), but only sE-selectin in NA (P<0.05), were correlated to airway conductance. sVCAM-1 was reduced by inhaled steroids (P<0.01). Our results indicate that endothelial cells are activated in asthma and that this activity has a bearing on airflow variability and bronchial responsiveness in NA.