Biomedical subjects
S Horne
Publications and source records attributed to S Horne.
Domestic violence in Russia.
Reported incidence and frequency rates of domestic violence in Russia exceed Western figures by 4 or 5 times. Although a grassroots social services movement has emerged to provide services for victims and families, a number of historical and cultural influences unique to Russia present challenges with regard to the problem of domestic violence. These include a history of institutional oppression of women, arcane legal procedures, a shortage of housing and shelters, untrained medical professionals, and widespread misinformation and myths about domestic violence. This article documents incidence and prevalence of domestic violence, cultural and historical influences, legal issues, and specific challenges to ending domestic violence in Russia.
Phenomenology: understanding the life experience of long-term ventilated adolescents.
To care effectively for young people requires insight into how the children think about their care and how they want to live their lives. A phenomenological approach was used to gain new understandings into the thoughts and experiences of two teenage boys who were on long-term ventilation. The method included use of dialogue, observation and a reflective diary. Five themes emerged which helped the team caring for the boys to plan and prioritise care. Phenomenology is recommended as one way for nurses to become more thoughtfully aware of their practice.
Vertebrate genome evolution and the zebrafish gene map.
In chordate phylogeny, changes in the nervous system, jaws, and appendages transformed meek filter feeders into fearsome predators. Gene duplication is thought to promote such innovation. Vertebrate ancestors probably had single copies of genes now found in multiple copies in vertebrates and gene maps suggest that this occurred by polyploidization. It has been suggested that one genome duplication event occurred before, and one after the divergence of ray-finned and lobe-finned fishes. Holland et al., however, have argued that because various vertebrates have several HOX clusters, two rounds of duplication occurred before the origin of jawed fishes. Such gene-number data, however, do not distinguish between tandem duplications and polyploidization events, nor whether independent duplications occurred in different lineages. To investigate these matters, we mapped 144 zebrafish genes and compared the resulting map with mammalian maps. Comparison revealed large conserved chromosome segments. Because duplicated chromosome segments in zebrafish often correspond with specific chromosome segments in mammals, it is likely that two polyploidization events occurred prior to the divergence of fish and mammal lineages. This zebrafish gene map will facilitate molecular identification of mutated zebrafish genes, which can suggest functions for human genes known only by sequence.
Centromere-linkage analysis and consolidation of the zebrafish genetic map.
The ease of isolating mutations in zebrafish will contribute to an understanding of a variety of processes common to all vertebrates. To facilitate genetic analysis of such mutations, we have identified DNA polymorphisms closely linked to each of the 25 centromeres of zebrafish, placed centromeres on the linkage map, increased the number of mapped PCR-based markers to 652, and consolidated the number of linkage groups to the number of chromosomes. This work makes possible centromere-linkage analysis, a novel, rapid method to assign mutations to a specific linkage group using half-tetrads.
Half-tetrad analysis in zebrafish: mapping the ros mutation and the centromere of linkage group I.
Analysis of meiotic tetrads is routinely used to determine genetic linkage in various fungi. Here we apply tetrad analysis to the study of genetic linkage in a vertebrate. The half-tetrad genotypes of gynogenetic diploid zebrafish produced by early-pressure (EP) treatment were used to investigate the linkage relationships of two recessive pigment pattern mutations, leopard (leo) and rose (ros). The results showed that ros is tightly linked to its centromere and leo maps 31 cM from its centromere. Analysis of half-tetrads segregating for ros and leo in repulsion revealed no homozygous ros individuals among 32 homozygous leo half-tetrads--i.e., a parental ditype (PD) to nonparental ditype (NPD) ratio of 32:0. This result shows that ros is linked to leo, a mutation previously mapped to Linkage Group I. Investigation of PCR-based DNA polymorphisms on Linkage Group I confirmed the location of ros near the centromere of this linkage group. We propose an efficient, generally useful method to assign new mutations to a linkage group in zebrafish by determining which of 25 polymerase chain reaction (PCR)-based centromere markers shows a significant excess of PD to NPD in half-tetrad fish.
Transient Brown's syndrome in juvenile chronic arthritis.
A 9-year-old boy with systemic juvenile chronic arthritis and Brown's syndrome (limitation of elevation of the adducted eye due to limitation of movement of the superior oblique tendon) is described. The resolution in association with steroid treatment suggested a transient tenonsynovitis involving the superior oblique tendon as the cause.
Serum IgE levels in white and metis communities in Saskatchewan.
Serum IgE levels and the prevalence of certain atopic diseases have been studied in 819 individuals in 176 white families living in central Saskatchewan and in 275 individuals in 58 Metis families living in northern Saskatchewan. The geometric mean serum IgE level in the white community (81.3) u/ml) was lower than that in the Metis community (275.4 u/ml). The prevalence of asthma, eczema and urticaria was greater in the white than in the Metis community and contrasted with the increased prevalence of helminth infestation as well as of other untreated viral and bacterial diseases in the Metis community. It is suggested that atopic disease is the price paid by some members of the white community for their relative freedom from diseases due to viruses, bacteria and helminths.
Serum IgE levels in parents and children.
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