Mental health indices may fully mediate the relationship between morningness-eveningness and disease control among adult asthma patients.

Objective: The aim of this study was to assess the association between morningness-eveningness and disease control with consideration of mental state as a mediator and the control of confounding factors among adult asthma patients.Methods: This is a cross-sectional study, which included a nonrandom sample of N = 66 patients from an outpatient unit with a confirmed asthma diagnosis, who gave an informed consent and completed a set of questionnaires: a survey comprising questions about sociodemographic and clinical characteristics, the Asthma Control Test (ACT), the Composite Scale of Morningness (CSM), and the General Health Questionnaire (GHQ-28). Mediation models were created separately for each GHQ-28 dimension (somatic symptoms, anxiety/insomnia, social dysfunction and depressive symptoms), for a total score and for four GHQ-28 dimensions together, considered as mediators.Results: Low morning affect was related to poor disease symptom control among patients with asthma. The effect was fully mediated by non-psychotic mental health indices. Evening-time preference was associated with a rise in asthma control, and mediated by somatic symptoms and anxiety/insomnia, when controlled for morning affect. Conclusions: The current study underlines the significance of assessment of both individual morningness-eveningness preference and mental health in the management of asthma symptoms.

Cross-cultural adaptation and validation of the RhinAsthma Patient Perspective (RAPP) in the Polish population.

INTRODUCTION: The RhinAsthma Patient Perspective (RAPP) was developed in Italian to assess the Health Related Quality of Life (HRQoL) impairment in patients with asthma and allergic rhinitis (AR) in daily practice. AIM: To cross-culturally validate the Polish version. MATERIAL AND METHODS: The Polish version was administered to patients suffering from asthma and rhinitis in a prospective observational study. Polish RAPP, along with SF-12, ACT, and a Symptomatologic VAS was filled in twice, with a 4-week interval between visits. At visit 2, a Global Rating Scale (GRS) was completed to assess any change in health status. Internal consistency, validity, reliability, discriminant ability and responsiveness to change as well as Minimal Important Difference were determined. RESULTS: The factor and confirmatory analysis revealed a unidimensional structure of RAPP. Internal consistency was satisfactory with Cronbach's α (visit 1 = 0.85, visit 2 = 0.89). High reliability (ICC = 0.89 and a CCC = 0.94) was found. Validity analyses showed good correlations of the Polish RAPP with Physical and Mental Component Scores of SF-12. In addition, RAPP adequately discriminated patients on the basis of the asthma control level and rhinitis severity (p < 0.03 for all the analyses), and demonstrated to be sensitive to change. MID value was 1 point. CONCLUSIONS: The study confirmed the reliability and validity of the Polish version of RAPP demonstrating that it is a useful tool in the assessment of HRQoL in patients with asthma and comorbid allergic rhinitis, in clinical practice.

Determination of microcystins in environmental samples using capillary electrophoresis.

The applicability of capillary zone electrophoreses (CZE) and micellar electrokinetic chromatography (MEKC) methods for the simultaneous determination of two frequently occurring microcystins (MCs-LR and -YR) and a new variant (MC-YA) in crude extracts of Hungarian bloom samples and cyanobacterial cultures was studied. It was found that the comparison of the results obtained by both CZE and MEKC measurements (due to the differences in their separation mechanisms) for the same sample can guarantee the reliability of the quantitative results. In our work environmental samples like lake waters, water bloom samples, cyanobacterial isolates were analysed. The three microcystins could be directly determined in water bloom samples collected from Hungarian lakes and laboratory culture samples of cyanobacteria.

Determination of microcystins in environmental samples using capillary electrophoresis.

The applicability of capillary zone electrophoresis (CZE) and micellar electrokinetic chromatography (MEKC) methods for the simultaneous determination of two frequently occurring microcystins (MCs-LR and -YR) and a new variant (MC-YA) in crude extracts of Hungarian bloom samples and cyanobacterial cultures was studied. It was found that the comparison of the results obtained by both CZE and MEKC measurements (due to the differences in their separation mechanisms) for the same sample can guarantee the reliability of the quantitative results. In our work environmental samples like lake waters, water bloom samples, cyanobacterial isolates were analysed. The three microcystins could be directly determined in water bloom samples collected from Hungarian lakes and laboratory culture samples of cyanobacteria.

Towards the protein phosphatase-based biosensor for microcystin detection.

A colorimetric test for the detection of microcystins based on immobilised protein phosphatase (PP) has been developed. A PP2A produced by molecular engineering has been used and its performance has been compared to those of commercial PP2A and PP1. Covalent immobilisation of the enzyme using glutaraldehyde, encapsulation by sol-gel and entrapment with photocrosslinkable poly(vinyl alcohol) bearing styrylpyridinium groups (PVA-SbQ) have been compared, the latter method providing the highest immobilisation yields. Screen-printed carbon electrodes (SPEs), Maxisorp microtiter wells and Ultrabind modified polyethersulfone affinity membranes have been used as immobilisation supports. Whilst the highest immobilisation yields were obtained with microtiter wells, the highest operational and storage stabilities were achieved with carbon SPEs and membranes, respectively. The immobilisation of PP by PVA-SbQ provided a means to preserve the enzymatic activity, which decreased at fast rates when the enzyme was kept in solution. The colorimetric test using p-nitrophenyl phosphate has demonstrated that the immobilised enzyme is able to recognise both microcystin variants (MC-LR and MC-RR), although optimisation work should be performed to achieve appropriate limits of detection. With the purpose to develop an electrochemical biosensor, several phosphorylated substrates have been used. Promising results have been achieved with the commercial enzymes and alpha-naphtyl phosphate, p-aminophenol phosphate and catechol monophosphate as enzyme substrates, guaranteeing the viability of the electrochemical approach.

Enzyme inhibition-based biosensor for the electrochemical detection of microcystins in natural blooms of cyanobacteria.

An electrochemical biosensor for the detection of microcystin has been developed based on the inhibition of the protein phosphatase 2A (PP2A) by this cyanobacterial toxin. The enzyme has been immobilised by entrapment using a poly(vinyl alcohol) azide-unit pendant water-soluble photopolymer (PVA-AWP). Electrode supports and immobilisation conditions have been optimised by colorimetric assays, the highest immobilisation yields being obtained with screen-printed graphite electrodes and the 1:2 PP2A:PVA ratio. Catechyl monophosphate (CMP), alpha-naphthyl phosphate (alpha-NP) and 4-methylumbelliferyl phosphate (4-MUP) have been used as phosphorylated substrates to monitor the protein phosphatase activity by electrochemical methods, the former providing the highest chronoamperometric currents at appropriate working potentials (+450mV versus Ag/AgCl). Incubation with standard microcystin solutions has demonstrated the inhibition of the immobilised enzyme, proportional to the toxin concentration. The standard inhibition curve has provided a 50% inhibition coefficient (IC(50)) of 83mugL(-1), a limit of detection (LOD; 35% inhibition) of 37mugL(-1), and 100% inhibition at about 1000mugL(-1). Real samples of cyanobacterial blooms from the Tarn River (Midi-Pyrénées, France) have been analysed using the developed amperometric biosensor and the toxin contents have been compared to those obtained by a conventional colorimetric protein phosphatase inhibition (PPI) assay and high-performance liquid chromatography (HPLC). The results clearly justify the use of the developed amperometric biosensor as screening method for microcystin detection.