J M van Damme | PubMed Health

PubMed1997

Mitochondrial DNA variation within P-type cytoplasmic male sterility of Plantago lanceolata L.

MtDNA restriction fragment polymorphisms were found between cytoplasmic male-sterility types P and R of Plantago lanceolata with the homologous probe pPl311 and maize mtDNA fragments derived from the regions of atp1, cox1 and cox2. No mtDNA differences were observed between male- sterile and restored plants with the same cytoplasmic type. The con-sistency of the polymorphisms was studied in 83 plants from 24 natural populations in the Netherlands. Within the R-cytoplasm no mtDNA polymorphisms were found, whereas seven variant mtDNA RFLP patterns were observed within the P-cytoplasm using pPl311. We also report on a putative new cytoplasmic male-sterility type, which showed a unique RFLP pattern supporting its distinct status.

Journal Article↗

PubMed1981

Strategies for water supply systems in developing countries.

Among the major water supply problems in developing countries are the lack of qualified manpower, inadequate management, and limited financial resources. Trained personnel is not only deficient in many of the water agencies, but also in ministries, health agencies, community organizations and labour categories of all kinds. Operation and maintenance, quality control and revenue collection leave much to be desired. The scarce resources are barely or not at all sufficient to scope with the day to day problems, let alone with investments for the future. These situations differ considerably from region to region. Several countries may have manpower available but lack finance. Others may have ample funds, but have a shortage of trained people. Many have neither of them. Management problems occur almost everywhere. Each of the countries has its own options and constraints for future developments. In many developing countries there is also a serious scarcity of water resources. In these countries the introduction of water reuse practices would be an obvious option. The policies and the choice of technologies however, should be seen in the light of these countries overriding problems.

Developing Countries↗