44 research outputs found
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The evaluation of losses in maize stored on a selection of small farms in Zambia with particular reference to the development of methodology (G109)
The terms of reference for this project were: (1) to develop a satisfactory methodology to evaluate the extent of losses; (2) to establish reasonably reliable cost- benefit relationships for a simple improved farm storage technique; and (3) to recommend whether a longer term project should be undertaken over a wider area to evaluate cost-benefit relationships of improved storage techniques for the purpose of planning development programmes.
Following these criteria the report makes a detailed study of various methods of assessing losses. These methods are then applied to maize stored by small farmers in selected areas of Zambia and an evaluation made of the costs and benefits to these farmers of adopting an improved storage technique
The world market for canned pineapple and pineapple juice
4.60SIGLEAvailable from British Library Lending Division - LD:9055.9(TDRI-G--186) / BLDSC - British Library Document Supply CentreGBUnited Kingdo
Seasonal patterns of sediment loading and benthic invertebrate community dynamics in Lake Tanganyika, Africa
Quantitative measurement of the total, peroxyl radical-trapping antioxidant capability of human blood plasma by controlled peroxidation
Birth, evolution, and transmission of satellite-free mammalian centromeric domains
Mammalian centromeres are associated with highly repetitive DNA (satellite DNA), which has so far hindered molecular analysis of this chromatin domain. Centromeres are epigenetically specified, and binding of the CENPA protein is their main determinant. In previous work, we described the first example of a natural satellite-free centromere on Equus caballus Chromosome 11. Here, we investigated the satellite-free centromeres of Equus asinus by using ChIP-seq with anti-CENPA antibodies. We identified an extraordinarily high number of centromeres lacking satellite DNA (16 of 31). All of them lay in LINE- and AT-rich regions. A subset of these centromeres is associated with DNA amplification. The location of CENPA binding domains can vary in different individuals, giving rise to epialleles. The analysis of epiallele transmission in hybrids (three mules and one hinny) showed that centromeric domains are inherited as Mendelian traits, but their position can slide in one generation. Conversely, centromere location is stable during mitotic propagation of cultured cells. Our results demonstrate that the presence of more than half of centromeres void of satellite DNA is compatible with genome stability and species survival. The presence of amplified DNA at some centromeres suggests that these arrays may represent an intermediate stage toward satellite DNA formation during evolution. The fact that CENPA binding domains can move within relatively restricted regions (a few hundred kilobases) suggests that the centromeric function is physically limited by epigenetic boundaries