The Bedu

Article Abstract:

Western culture has always considered the Bedu, the nomadic tribes of the Middle East and Africa, as the prime example of true wanderers. Despite the Western world's admiration for them, the nomadic lives of the Bedus are forced on them by circumstances and not inherent. Historically, the ancestors of the Bedus originate from the Syrian desert and were able to make use of the camel during their wanderings between 2000 B.C. and 853 B.C. While Bedus are considered traditional by most Western culture, they have also proven to be very adaptable and versatile.

History, Nomads, Tribes, Bedouins

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Implementation of an adaptive HF network

Article Abstract:

There have been major advances in automatic and adaptive radio communication systems over the past 10 years. Advances have led to the possibility of separating the user from the radio, resulting in the concept of high frequency (HF) radio. A system consolidating many of the advances is being developed at GEC-Marconi Communications Limited. The system is a flexible, fully meshed managed HF network able to support a broad range of operational applications. The system architecture is described in some detail.

Communication, Communications, Radio

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HLA and pregnancy: the paradox of the fetal allograft

Article Abstract:

Maternal-fetal immunology is paradoxical. It has been found that placental cells at the maternal-fetal interface do not have classical HLA antigens. There is also evidence to suggest that maternal-fetal HLA incompatibility is somehow advantageous. Prospective studies among the Hutterites indicate that risk of fetal loss increases with HLA matching. Studies of pregnant women with rheumatoid arthritis indicate that class II antigens of the fetus are recognized by the mother's immune system during pregnancy.

Physiological aspects, HLA histocompatibility antigens, HLA antigens, Pregnancy, Immunogenetics

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