Occupational disability on psychiatric grounds in South African school-teachers

Objective: School-teachers are exposed to high levels of stress and have high rates of premature retirement on psychiatric grounds. This study investigated factors associated with occupational disability due to psychiatric disorders in teachers in South Africa. Method: This retrospective study investigated 81 school-teachers in the Cape Town area who had been declared permanently medically disabled as a consequence of psychiatric disorders. Results: Patients were relatively young (44±6.1 yrs), had experienced symptoms for 5.2±3.8 yrs, and had been treated for 4±3.5 yrs. Almost half had a family history of psychiatric disorder, and the majority (N = 66. 81%) cited work-related stress as a significant contributing factor. Major depressive disorder was the commonest diagnosis (83%), and 56% had co-morbid Axis-I diagnoses. Thirty percent had prominent underlying obsessive-compulsive personality traits, and 46% displayed classroom phobia. Conclusion: Work-related stress is a major factor in South African teachers with occupational disability on psychiatric grounds

Rural Telecommunications Infrastructure Selection Using the Analytic Network Process.

The decisions involved in rural settings are of complex nature, with some aspects compounded by the presence of intangible criteria. Hence, a suitable approach is needed that can produce effective solutions. This paper describes the applicability of a multicriteria decision-making method, specifically the analytic network process (ANP), to model the selection of an appropriate telecommunications infrastructure technology, capable of deploying e-services in rural areas of developing countries. It aims to raise awareness among telecommunication planners about the availability of ANP, and to demonstrate its suitability to enhance the selection process. The proposed model is constructed based on concerned experts' views of relevant selection criteria and potential technology alternatives. Its network structure caters for all possible dependencies and interactions among criteria and alternatives

Design of Strongly Modulating Pulses to Implement Precise Effective Hamiltonians for Quantum Information Processing

We describe a method for improving coherent control through the use of detailed knowledge of the system's Hamiltonian. Precise unitary transformations were obtained by strongly modulating the system's dynamics to average out unwanted evolution. With the aid of numerical search methods, pulsed irradiation schemes are obtained that perform accurate, arbitrary, selective gates on multi-qubit systems. Compared to low power selective pulses, which cannot average out all unwanted evolution, these pulses are substantially shorter in time, thereby reducing the effects of relaxation. Liquid-state NMR techniques on homonuclear spin systems are used to demonstrate the accuracy of these gates both in simulation and experiment. Simulations of the coherent evolution of a 3-qubit system show that the control sequences faithfully implement the unitary operations, typically yielding gate fidelities on the order of 0.999 and, for some sequences, up to 0.9997. The experimentally determined density matrices resulting from the application of different control sequences on a 3-spin system have overlaps of up to 0.99 with the expected states, confirming the quality of the experimental implementation.Comment: RevTeX3, 11 pages including 2 tables and 5 figures; Journal of Chemical Physics, in pres

Family therapy for schizophrenia: cultural challenges and implementation barriers in the South African context

Family therapy is an effective, evidence based intervention for schizophrenia. This literature review explores the impact of culture on family therapy as a treatment model for schizophrenia and examines how cultural beliefs impact on access to care. Although there is a good deal of evidence to suggest that certain principles of family therapy such as empathy and psycho-education are universal, there is a paucity of literature about the role of culture in designing family interventions for people living with schizophrenia in a culturally diverse setting such as South Africa. It is well acknowledged that cultural ideologies influence families’ belief systems of schizophrenia, expected expressed emotion, and levels of stigma in relation to mental illness. Additionally, in adapting models designed for first-world settings, consideration needs to be given to aspects such as language, educational level and accessibility of mental health care facilities. Family therapists are increasingly recognising the need for the study and implementation of evidence based culture-relevant and culture-responsive therapeutic techniques. These techniques need to be cost-effective and will require training, supervision, staff support, and management input in order to become generally available.Keywords: Schizophrenia; Family therapy; South Africa; Cultur

The prevalence of burnout and depression in medical doctors working in the Cape Town Metropolitan Municipality community healthcare clinics and district hospitals of the Provincial Government of the Western Cape: a cross-sectional study

Aim: This study investigated burnout and depression in medical doctors in the context of work-related conditions and the role of resilience as a modifiable factor.Method: A cross-sectional, observational study was conducted on consenting medical doctors (n = 132) working at Cape Town Metropolitan Municipality primary healthcare facilities of the Provincial Government of the Western Cape. Data were collected from doctors at 27 facilities by means of a self-administered questionnaire battery, containing socio-demographic information, the Beck Depression Inventory (BDI), the Maslach Burnout Inventory (MBI) and the Connor-Davidson Resilience Scale (CD-RISC).Results: Of 132 doctors included in the analysis, 76% experienced burnout, as indicated by high scores in either the emotional exhaustion or depersonalisation subscales. In addition, 27% of doctors had cut-off scores on the BDI indicating moderate depression, while 3% were identified to have severe depression. The number of hours, work load, working conditions and system-related frustrations were ranked as the most important contributing factors to burnout. More experienced doctors and those with higher resilience scores had lower levels of burnout, as evident by their lower scores in the emotional exhaustion and depersonalisation domains of the MBI.Conclusion: Both burnout and depression are prevalent problems in doctors working at district level and in communities. Resilience appears to be protective and may be a useful target for future intervention.Keywords: depression, burnout, stress, physician, medical docto

Thermodynamic aspects of materials' hardness: prediction of novel superhard high-pressure phases

In the present work we have proposed the method that allows one to easily estimate hardness and bulk modulus of known or hypothetical solid phases from the data on Gibbs energy of atomization of the elements and corresponding covalent radii. It has been shown that hardness and bulk moduli of compounds strongly correlate with their thermodynamic and structural properties. The proposed method may be used for a large number of compounds with various types of chemical bonding and structures; moreover, the temperature dependence of hardness may be calculated, that has been performed for diamond and cubic boron nitride. The correctness of this approach has been shown for the recently synthesized superhard diamond-like BC5. It has been predicted that the hypothetical forms of B2O3, diamond-like boron, BCx and COx, which could be synthesized at high pressures and temperatures, should have extreme hardness

Molecular basis for passive immunotherapy of Alzheimer's disease

Amyloid aggregates of the amyloid-{beta} (A{beta}) peptide are implicated in the pathology of Alzheimer's disease. Anti-A{beta} monoclonal antibodies (mAbs) have been shown to reduce amyloid plaques in vitro and in animal studies. Consequently, passive immunization is being considered for treating Alzheimer's, and anti-A{beta} mAbs are now in phase II trials. We report the isolation of two mAbs (PFA1 and PFA2) that recognize A{beta} monomers, protofibrils, and fibrils and the structures of their antigen binding fragments (Fabs) in complex with the A{beta}(1–8) peptide DAEFRHDS. The immunodominant EFRHD sequence forms salt bridges, hydrogen bonds, and hydrophobic contacts, including interactions with a striking WWDDD motif of the antigen binding fragments. We also show that a similar sequence (AKFRHD) derived from the human protein GRIP1 is able to cross-react with both PFA1 and PFA2 and, when cocrystallized with PFA1, binds in an identical conformation to A{beta}(1–8). Because such cross-reactivity has implications for potential side effects of immunotherapy, our structures provide a template for designing derivative mAbs that target A{beta} with improved specificity and higher affinity