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Electrochemical behaviour of some pyrimidine derivatives: polarographic reduction of 1, 3-dimethyl-2, 4, 6(1h, 3h, 5h) pyrimidinetrione and its substituted 5-phenylazo
(
Qatar University
, 1994 , Article)
The polarographic behaviour and spectrophotometric pKa of 1,3-dimethyl barbituric acid and 5-phenylazo substituted products were investigated in buffer solution of pH ~ 2-11. The results revealed an azo form of the substituted ...
Cleavability of Decomposition Spaces
(
Qatar University
, 2006 , Article)
Assume that X and Y have the same homotopy type, if X (respectively Y) is cleavable over p, have proved that the decomposition space of Y/g (respectively X/f) is cleavable over p. A result ncerning Arhangel'skii - Teroni's ...
الجانب العاطفي وأثره في استقرار الأسرة
(
Qatar University
, 2002 , Article)
A List of Marine Algae from Seashores of Iran (Hormozgan Province)
(
Qatar University
, 1999 , Article)
Seashores of Hromzgan province in south of Iran were studied for collection and recogna-tion of algal flora (1991-1996). 150 species of marine algae were recognized, including 36 Chlorophyta (16 new). 33 Phaeophyta (15 ...
A comparative study of the effects of clumping, substrate, light, depth of burial and soil moisture upon the germination of seeds of weeds and crops grown in the sudan gezira.
(
Qatar University
, 1985 , Article)
The influence of the number of seeds per clump upon germination of oryza sativa L., Gossypium hirsutum L., Brachiaria eruciformis (Sm.) Griseb, Dinbera retroflexa (Vahl) Panz. and Echinochloa colonum (L.) Link was investigated ...
Ciliates and Other Microorganisms in the Plankton from Al-Sammaliah Island- Arabian Gulf-United Arab Emirates
(
Qatar University
, 1999 , Article)
Al-Sammaliah Island is one of more than 200 islands belonging to United Arab Emirates in the Arabian Gulf. This inshore shallow island lies at the north east coast of Abu Dhabi and is connected to the Arabian Gulf through ...
Synthesis and reactivity of 2-chloro-4-phenyl-6-p-tolyl-nicotinonitrile Towards some nucleophiles
(
Qatar University
, 1986 , Article)
The synthesis and reaction of 2-Chloro-4-phenyl-6-p-tolyl- nicotinonitrile (I) with hydrazine hydrate, sodium azide and urea to give the corresponding hydrazino tetrazolopyridine and urea derivatives respectively, are ...
Some Unique Characteristics Of The Indian Ocean
(
Qatar University
, 1999 , Article)
Qualitative Dealing with Quantified Assertions
(
Qatar University
, 2002 , Article)
In this paper we present a newapproach to a symbolic treatment ofquan-tified statements having the following form "Q A's are 5's", knowing that A and B are labels denoting sets,and Q is a linguistic quantifier interpreted ...
A review of the trematode genera Haplosplanchnus Looss, 1902 and Prohaplosplanchnus Tang and Lin, 1978 with redescription of three species from the mullet in Libya
(
Qatar University
, 1997 , Article)
The trematode genera Haplosplanchnus Looss, 1902 and Prohaplosplanchnus Tang Lin, 1978 were reviewed. H. indica Gupta and Ahmad, 1979, H, mugilis Nahhas and Cable, 1964 and P. diorchis Tang and Lin, 1979 were redescribed ...