Browsing by Subject "Botany"
Now showing items 21-40 of 113
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Comparison of antibiotic susceptibilities of four species of coagulase-negative staphylococci isolated rom normal skin and acne Lesions: a statistical approach
( Qatar University , 1996 , Article)Ten strains of each of four species of coagulase negative staphylococci: S. epidermidis, S. hominis, S. capitis, and S. cohnii isolated from both acne lesion and normal skin (total 80 strains) were tested for their antibiotic ... -
Condition and trend of a depression-type habitat In rainfed desert rangelands of Qatar In response to fertilizer application
( Qatar University , 1994 , Article)Characteristics of a rainfed depression-type habitat in desert ranges, and its response to fertilizer application were studied. A single fertilizer application at a rate of 75 Kg ha1 prior to the rainy season improved range ... -
Contribution of the Fungal Flora and Mycotoxins of Some Canned Tomato Paste Samples
( Qatar University , 1994 , Article)Twenty-two species belonging to seven genera were isolated and identified from 21 tomato paste samples on glucose-Czapek's (5 genera and 14 species) and 10% NaCl-glucose-Czapek's (6 genera and 17 species) agar media, at ... -
A critical analysis of "harvest index"
( Qatar University , 1993 , Article)The many ways in which harvest index ratio (HI) can be used are discussed. A selection of published values for HI are given. Attention is drawn to the confusion in calculating the HI such that some present methods of ... -
Cytological Studies On The Effect Of The Herbicide "Dual" On Allium Cepa
( Qatar University , 1988 , Article)Dual is widely used in Egypt as an active herbicide against annual grass weeds in soybean, sunflower, sugar beet and maize. Cytological studies have been carried out to show the effect of the herbicide on cell division in ... -
Cytology and palynology of common monocots in mariut, egypt i. Common species of the families alliceae and liliaceae
( Qatar University , 1994 , Article)The present sludy includes cytological and palynological investigations of five species belonging to the families Alliaceae and Liliaceae, as an impetus for more in-depth floristic, taxonomic and phytogeographical ... -
Ecological Notes On The Floristic Composition And Endemic Species Of Saint Catherine Mountains, South Sinai, Egypt
( Qatar University , 1995 , Article)The present study is aimed at (1) giving complete list of all plant speciec growing in Saint Catherine mountains, (2) studying the relationship between species number and the amount of precipitation at the time of study ... -
Ecophysiological Characteristics, Distribution, and Nutritional Value of Desert Range Plants in Qatar
( Qatar University , 1993 , Article)Despite the scarcity of water, desert ranges of Qatar can support a characteristic diversity of species and an all-year-round supply of feed. A correlation between carbon dioxide fixation mechanism, distribution of species, ... -
Edaphic Gradients And Species Attributes Influencing Plant Distribution In Littoral Salt Marshes Of Qatar
( Qatar University , 1994 , Article)Edaphic gradients of moisture and salinity are critical environmental stresses that seriously influence littoral salt marsh flora, and determine the zonation of coastal vegetation. Shoreline communities subjected to severe ... -
Edaphic properties and soil cyanobacteria of South Western Saudi Arabia.
( Qatar University , 1997 , Article)Three sites at each of five localities, in the South Western Region of Saudi Arabia were surveyed during 1992, for their soil physico-chemical properties, and cyanobacterial communities. The soils were moderately calcareous, ... -
Effect Of "Ethrel" On Colour Development And Juice Quality Of Sweet Oranges And Grapefruits
( Qatar University , 1994 , Article)"Ethrel" was sprayed at 0,120, 420 and 480 ppm on sweet orange and grapefruit trees at fruit maturity stage to improve colouring and juice quality. Changes in fruit colour were observed in both varieties but the results ... -
Effect Of Carbon disulphide, Acrylonitrile And Formaldehyde On Egyptian Paddy Grain-Borne Fungi
( Qatar University , 1988 , Article)Fumigation, with various doses of carbon disulphide, acrylonitrile and formaldehyde for 8, 16 and 32 hours, of paddy grains indicate that formaldehyde was more toxic to the fungi than carbon disulphide and acrylonitrile. ... -
Effect Of Culture Conditions On The Production Of Growth Regulators And Extracellular Enzymes By Streptomyces Olivaceoviridis
( Qatar University , 1996 , Article)It was proposed to find out the optimum environmental conditions and nutritional requirements for highest growth regulating substance and enzyme production by Streptomyces olivaceoviridis. The optimum oc-amylase and ... -
The Effect of Cutting Height on Forage Yield and Performance of Alfalfa Cultivars
( Qatar University , 1999 , Article)Six exotic alfalfa (Medicago sativa L.) cultivars were evaluated for their forage yield performance and persistency under different cuttings heights during 1991/1992 in UAE. Cultivars revealed a highly significant difference ... -
Effect of Fertilizer Application on Diversity and Production of Weeds in Crop-Less Fields
( Qatar University , 1993 , Article)The present study aims at assessing the effect of fertilizer application (with monofactorial deficiency of nitrogen, phosphorus, potassium and lime) on the diversity and production of weeds in cultivated but crop-less ... -
Effect of gamma radiation on the morphology and Thermophysical properties of the pollen wall of Phoenix dactylifera L.
( Qatar University , 1994 , Article)Pollen grains of Phoenix dactylifera were exposed to different doses of gamma radiation (250,500,1000 rad and 1 M rad). To access the effect of radiation on the external morphology of the pollen grains, they were examined ... -
Effect of level of relative humidity on fungi and germination capacity of paddy (oryza sativa l.) Grains in egypt
( Qatar University , 1993 , Article)The changes in the composition of paddy grain-borne fungi in the germination capacity, and in the moisture content of paddy grains at various levels of relative humidity (r.h.) (~ 0-100%) stored at 20°C for 1, 2, 3 and 4 ... -
Effect Of Sugar Beet Seed Treatments With Some Growth Regulators On Damping Off Incidence, Total Soluble Sugars And Yield
( Qatar University , 1989 , Article)Seven seed borne fungi were isolated from sugar beet seeds viz. Alternaria alternata, Helminthosponum sp., Rhizopus stolonifer, Epicoccum sp., Rhizoctonia solani, Phoma betae and Fusarium oxysporium f. sp. befae. The last ... -
Effects of the expected sea level rise on avicennia marina L: a case study in Qatar
( Qatar University , 1995 , Article)A simulation of the expected sea levels rise was carried out by imposing a state of protracted flooding on seedlings of the mangrove species Avicennia marina L. under natural conditions. The imposed flooding resulted in ... -
Enzyme production and antibiotic susceptibility of propionibacterium acnes and p. Granulosum from acne vulgaris patients and healthy persons
( Qatar University , 1996 , Article)Seventeen strains of Propionibacterium acnes and ten strains of P. granulosum were isolated from acne patients, in addition to ten isolates of each species from healthy persons. All strains were examined for their enzymatic ...