Soil biota and the presence of organic matter are the major factors for developing soil structure
in sandy soils. Three types of aggregates were observed in sand dunes: (1) microbial …

The effects of the interactions between higher plants and microorganisms and the addition
of selected microorganisms on aggregation of sand from an embryo dune were examined. …

The importance of microorganisms in the aggregation of sand in an embryo dune system was
examined. Of three main types of aggregates formed, microbial aggregates were found to …

Aggregation of sand by microorganisms was assessed in a dune succession ranging from
unstable foredunes to stable fixed dunes. The microorganisms isolated from aggregates were …

Jejunal biopsies from 11 HIV-infected male homosexuals, without secondary enteropathogen
infection, were examined at ultrastructural and light microscope level. Subjects were …

Most people arriving in Great Britain from the Third World do so at Heathrow Airport, London.
All potential imunigrants and a proportion of visitors are referred to the health control unit, …

T and B cell function, in particular IgD production in vitro, were studied across the spectrum
of HIV infection in homosexual men and compared with seronegative homosexual and …

Five HIV p24 antigen (p24Ag)-positive patients received alpha interferon during trials of therapy
for hepatitis B. Four of these showed marked falls in p24Ag during treatment. One of the …

Access to help from social services, drugs agencies, support groups etc Ability to make
important life decisions Treatment of pregnant women can dramatically reduce the risk of their …

SIR,-Retinal cotton wool spots are a well recognised feature of infection with the human
immuno-deficiency virus (HIV), though their aetiology remains unknown. The in situ hybridisation …