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Now showing items 91-100 of 105
A study of nutrient dynamics in the coastal dunes of northwestern egypt.
(
Qatar University
, 1990 , Article)
Biomass and nutrient cycling are evaluated in sites of Ammophita arenaria and Onoaisvaginalis which are among the most common species growing on the coastal dunes of the western desert of Egypt. Both species accumulate N ...
Planting Date Effect On Growth Characters And Yield Of Sorghum Under A Dry Farming-System In An Arabian Gulf Environment
(
Qatar University
, 1996 , Article)
Irrigated crop production in Qatar is a risky enterprise due to extreme weather conditions. Temperature is sufficiently warm to allow planting of grain sorghum [Sorghum bicolor (L.) Moench] from Aug through to Oct. Crops ...
Plant growth, metabolism and adaptation in relation to stress conditions. Vii. Respiration, nitrogen and proline contents in french bean and maize plants as influenced by salinity
(
Qatar University
, 1989 , Article)
Carbon dioxide production by seedlings, whole plants and leaves of French bean
and of maize showed progressively greater increases with increasing concentrations
of Na2S04 added to the basal medium. Also, in response to ...
Age Environmental Factors, Germination And Seedling Emergence Of Ocimum Basilicum L
(
Qatar University
, 1990 , Article)
Fresh and exhumed seeds of Ocimuni basilicum L. gave 100 % germination at 13/11-h alternating temperature of 20/10, 32/18, 38/24 and 40/32 °C but did not germinate at constant temperatures. Germination was prevented in the ...
Monovalent Anion Interaction on the Electron Flow of Photosystem II in Soyabean Cells
(
Qatar University
, 1994 , Article)
Steady state of electron transport measurements from water to DMQ (2, 5 - dimethyl - P- benzoquinone) show a maximum bicarbonate effect (about four fold stimulation) following the addition of 5 mM HCO"3 to the previously ...
Pollen Morphology of some Cultivated Varieties of Strawberry
(
Qatar University
, 1999 , Article)
Pollen grains of twelve cultivated varieties of strawberries grown in Egypt were morphologically studied using both light microscopy and SEM observations. These varieties include eleven cultivars of Fragaria x ananassa ...
Screening Of Some Fungi For Uricolytic Activity
(
Qatar University
, 1996 , Article)
Twenty nine species of fungi have been tested for their uricase activity. Only twenty two species of them have the ability to produce uricases.
Most of the uncapable fungi to produce uricases belong to Basidiomycotina. ...
Antibacterial and antidermatophyte activities of some essential Oils from spices
(
Qatar University
, 1993 , Article)
The inhibitory effects of ten essential oil from different spices against the growth of various isolates of bacteria representing Gram-positive (seven isolates) and Gram-negative (four isolates) were studied. Eight ...
Studies on growth and chemical composition of tobacco varieties. IV - comparative effects of various combinations of fertilizers on economic potentialities of tobacco plants
(
Qatar University
, 1987 , Article)
In two experiments, tobacco plants were treated with various combinations of ammonium nitrate (23% N) and compound C (3.5% N, 23% P and 16% K). At all levels used in experiment I, stem length and number of leaves were ...
Fluometuron Induced Growth, Chemical And Photosynthetic Changes In Chlorella Vulgaris
(
Qatar University
, 1988 , Article)
Presence of fluometuron at different concentrations in the culture medium of Chlorella vulgaris induced pronounced inhibition in the growth rate and dry weight of the alga throughout the experimental period. Furthermore, ...