Cryptosporidium parvum infection requires host cell actin polymerization

The intracellular protozoan parasite Cryptosporidium parvum accumulates host cell actin at the interface between the parasite and the host cell cytoplasm. Here we show that the actin polymerizing proteins Arp2/3, vasodilator-stimulated phosphoprotein (VASP), and neural Wiskott Aldrich syndrome protein (N-WASP) are present at this interface and that host cell actin polymerization is necessary for parasite infection.     

In sickness and in health: associations between physical and mental well-being, employment and parental status in a British nationwide sample of married women

Many studies have been published which have examined the relationship between paid employment and women's health. As employment outside the home is likely to have differential effects for women with different family commitments, further analysis taking account of the association between paid employment and household circumstances is necessary. Using data from a large, representative British sample, this paper examines the effects of interactions between paid employment, social class, and parental status on women's health. The results show differential effects of these variables on physical and mental health. The most important influence on women's mental health (as measured by the 30-item General Health Questionnaire) is the age of their youngest child; women with children under five are most likely to show signs of psychological disturbance. With respect to physical health, age of the youngest child has no significant effect, but there is an interaction between employment status and social class. Paid employment, particularly full-time work, is associated with good physical health for middle-class women but not for working-class women.     

Chest pain with normal coronary arteries: a comparative study of psychiatric and social morbidity

Ninety-nine patients with chest pain and a presumptive diagnosis of coronary heart disease were assessed blindly within 24 hours of angiography, using standardized psychiatric and social interviews and a personality inventory. Thirty-one patients had normal coronary arteries (NCA), 15 had slight disease and 53 had significant coronary obstruction. Twenty-eight (61%) of the 46 patients with insignificant disease and 12 (23%) of the 53 with significant obstruction had psychiatric morbidity. Associations between the overall severity of psychiatric morbidity and measures of social maladjustment were strongest in the patients with normal coronary arteries. The 26 men with insignificant coronary artery disease had higher scores of neuroticism and extraversion than the 41 with important coronary occlusions. No differences were observed when the same comparisons were made for the women. The findings indicate that approximately two thirds of patients with normal and near-normal coronary arteries have predominantly psychiatric rather than cardiac disorders: the symptoms in these patients are more likely to represent the somatic manifestations of anxiety and overbreathing than the consequences of underlying cardiac disease. Physicians should be aware of the ways in which neurotic illness may present with symptoms mimicking cardiac disease, especially when cardiovascular symptoms are accompanied by phobic symptoms and unexplained shortness of breath.     

Surgery-attached psychogeriatric nurses: an evaluation of psychiatric nurses in the primary care team

Aspects of the work of five community psychiatric nurses are examined by means of a questionnaire completed by the nurses for a sample of 50 patients. Information sharing and a close working relationship with the general practitioner, skills relating to assessment and psychological support of patients, organization of care by other agencies, a detailed knowledge of community agencies, and a capacity for interdisciplinary working were all found to be important. Tasks relating to body care were reported in only a small number of cases. The nurses saw themselves as advising on the planning of patient management and the selection of medication in a substantial minority of cases. The original brief had been to care for psychogeriatric patients but a third of the patients fell into a younger age group. These findings are discussed in connection with their implications for the future training of nurses and the relationship between primary care teams and local psychiatric services.     

Effects of supra-physiological changes in human ovarian hormone levels on maximum force production of the first dorsal interosseus muscle

The purpose of this study was to investigate the effects of supra-physiological changes in ovarian hormone levels on maximum force production in two conditions, one physiological (pregnancy) and one pseudo-physiological (in vitro fertilization (IVF) treatment). Forty IVF patients were tested at four distinct stages of treatment and 35 women were tested during each trimester of pregnancy and following parturition. Maximum voluntary isometric force per unit cross-sectional area of the first dorsal interosseus muscle was measured. Plasma concentrations of total and bioavailable oestradiol and testosterone were measured, in addition to the total concentrations of progesterone and human chorionic gonadotropin. Despite significant changes in the concentrations of total progesterone, 17beta-oestradiol, bioavailable oestradiol and testosterone between phases, strength did not change significantly throughout IVF treatment (1.30+/-0.29, 1.16+/-0.38, 1.20+/-0.29 and 1.26+/-0.34 N mm-2, respectively, in the 4 phases of IVF treatment). Force production was significantly higher during the second trimester of pregnancy than following childbirth (1.33+/-0.20 N mm-2 at week 12 of pregnancy, 1.51+/-0.42 N mm-2 at week 20, 1.15+/-0.26 N mm-2 at week 36 and 0.94+/-0.31 N mm-2 at week 6 postnatal) but was not significantly correlated with any of the hormones measured. These data suggest that extreme changes in the concentrations of reproductive hormones do not affect the maximum force-generating capacity of young women.     

Differences Between Treatment Seekers in an Obese Population: Medical Intervention vs. Dietary Restriction

This study examined two groups of people who were pursuing treatment for obesity: either medical intervention (a hospital group; N = 20) or support for dietary restriction (a community group; N = 18). This study addressed four questions: (1) Were there differences between the two groups in terms of their psychological distress (as measured by the Symptom Checklist)? (2) Does binge eating moderate psychological distress? (3) Do feelings of ineffectiveness moderate psychological distress? and (4) Which variables best accounted for group membership (i.e., type of treatment sought)? Results suggested that the hospital group was significantly more distressed than the community group. However, there were no differences between the two groups with respect to binge eating or feelings of ineffectiveness. These findings suggest that it is the effects of morbid obesity that are most likely to moderate psychological distress.