Abdel Gadir Abdel Karim

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Detailed analyses are presented of the phytoplankton of two pairs of gravel pits in the Surrey-Middlesex area of the Thames Valley. One of each pair has been recently excavated while the other is much older. Gravel dredging was fairly localised during the investigation, so that it was possible to study an area of disturbed water and an area of undisturbed(More)
Phytoplankton production and respiration in the Blue Nile and White Nile at Khartoum were measured during the period November 1969–January 1971 using the light and dark bottle technique. Maximum rates of production coincided with periods of maximum phytoplankton densities. In the Blue Nile gross production varied between 0.00 gCm−3d−1 during the flood(More)
The variations in the number of Melosira granulata in the vertical column of the White Nile was followed for 18 months during the years 1969–71, together with diurnal changes. The monthly as well as the diurnal fluctuations in the levels of certain physical and chemical parameters were simultaneously considered. The counts indicated noticeable progressive(More)
The variation in numbers of the major planktonic algae in the surface waters of the Blue Nile and White Nile were followed for 29 months (August 1968–December 1970). In terms of biomass, the phytoplankton was dominated by diatoms and blue-green algae; other groups were of minor importance. High phytoplankton densities occurred during winter in both rivers,(More)
Fortnightly measurements of physical and chemical variables were made at two locations on the Blue and White Niles near Khartoum from August 1968 to December 1970. Variables analysed from each river were: temperature, pH, total residue, current velocity, oxygen, alkalinity, phosphate, nitrate, ammonia, silica, sulphate, iron, calcium, magnesium, sodium,(More)
The theory underlying the delineation of phytoplankton association is examined, and the associations of Abbot's pond and Priddy pool are characterised according to the conclusions derived from this examination. The importance of extended investigations is stressed. Abbot's pond has a eu-planktonic flora with abundant Asterionella formosa, Pandorina morum(More)
35 samples from different habitats but under the same environmental conditions have been analysed and compared with each other. The non-planktonic flora was found to be more varied than the phytoplankton, species of which remained more or less constant irrespective of the sampling area. Diatoms dominated the plankton, while in the other habitats most of the(More)
The index contains three parts. It begins with a master list of references, containing all articles published until 1980, arranged in alphabetical order after the first author. All articles are numbered, so that each of them can be identified by a numeral between 1 and 2111. These identification numbers are used in the next two parts to refer to their(More)
This paper assesses and quantifies the consequences of world trade liberalization in agriculture on trade and food security of Sudan. Sudan, with the agricultural sector as the main sector of economy, is characterized by its small open economy, and is classified as one of the least developed countries. Thus, Sudan becomes more vulnerable to any changes in(More)
Business facing a series of changes and developments that affect various areas of life, and for that we need new managerial decisions and problem solutions, The present work describes the essential and useful of mechanisms for the development of the product and the Agility, Which can be one of the most important suggested solutions for the development and(More)