Whitehead Group
Mostrando 1-6 de 6 artigos, teses e dissertações.
-
1. Simple-homotopy theory and Whitehead torsion / Teoria de homotopia simples e torção de Whitehead
Este trabalho apresenta a teoria de homotopia simples, desenvolvida por J. H. C. Whitehead, com o objetivo de obter um método para classificar espaços com o mesmo tipo de homotopia. Com esta motivação, Whitehead introduz o conceito de equivalência de homotopia simples entre complexos simpliciais, que posteriormente é generalizado para complexos CW, esp
Publicado em: 2007
-
2. Simple homotopy and classification of lens spaces. / Homotopia simples e classificação dos espaços lenticulares
Fizemos uma apresentação detalhada, com um enfoque geométrico, da Teoria de Homotopia Simples e como aplicação, uma análise detalhada da classificação por homotopia e homotopia simples dos Espaços Lenticulares
Publicado em: 2007
-
3. Glass fibres: absence of pulmonary hazard in production workers
Hill, J. W., Whitehead, W. S., Cameron, J. D., and Hedgecock, G. A. (1973).British Journal of Industrial Medicine,30, 174-179. Glass fibres: absence of pulmonary hazard in production workers. Seventy fibreglass workers with a mean of 19·85 years in the industry are compared with a control group having no exposure to glass fibre but otherwise matched for age
-
4. Assignment of the structural gene for the third component of human complement to chromosome 19.
The third component of complement (C3) is synthesized and secreted by cultured human primary fibroblasts. A monoclonal antibody having specificity for an antigenic determinant carried by human but not mouse C3 was used to study the continued expression of human C3 in three panels of independently derived human-mouse somatic cell hybrids. Expression of the hu
-
5. Isolation and characterization of polygalacturonase genes (pecA and pecB) from Aspergillus flavus.
Two genes, pecA and pecB, encoding endopolyglacturonases were cloned from a highly aggressive strain of Aspergillus flavus. The pecA gene consisted of 1,228 bp encoding a protein of 363 amino acids with a predicted molecular mass of 37.6 kDa, interrupted by two introns of 58 and 81 bp in length. Accumulation of pecA mRNA in both pectin- or glucose-grown myce
-
6. Frequency of the apolipoprotein E epsilon 4 allele in a case-control study of early onset Parkinson's disease.
OBJECTIVES: It has been suggested that Parkinson's disease and Alzheimer's disease may share a common or at least overlapping aetiology. The prevalence of dementia among cases of Parkinson's disease is known to be greater than expected in the general population. The frequency of the apolipoprotein epsilon 4 allele in a large case-control study of early onset