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السجلات المعروضة 431 -- 440 من 451
Bayes Estimation of the Parameter of Burr Type II Distribution in Case of Type II Censoring
(
Qatar University
, 1997 , Article)
Suppose that Xj, X2, ..., Xn is a random sample of failure times from a Burr type II (B2) distribution
with parameter 9. Let x = (xj, x2, , xr) with xj < x2 S x3 < < xr be the observed failure censored
sample of the first ...
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 ...
Population Ecology of the Intertidal Sea Star Asterina Burtoni Gray (Asreroidea: Echinodermata) In the Wakrah Bay, South East Of Qatar
(
Qatar University
, 1995 , Article)
The abundance, distribution and population age structure of the sea star Asterina burtoni Gray were investigated in the intertidal area of the Wakrah Bay, South East Qatar Peninsula from October, 1993 to January, 1994. The ...
Petrochemical Investigation On El Ehena Pluton, Western Al-Quwayiyah Region, Saudi Arabia
(
Qatar University
, 1991 , Article)
The El Ehena area represents a small circular granite intrusion intruded in a metasedimentary sequence. The rocks are coarse grained with hypidomorphic texture and consist mainly of quartz, K-feldspar mostly perthitic and ...
Synthesis and biological testing of 2,4-disubstituted thiazole derivatives as Potential antitumor antibiotics
(
Qatar University
, 1994 , Article)
A series of thiazole derivatives bearing amino, acetamido or thioureido synthons at position 2- and thiosemicarbazone or 1,2,4-triazolethione moieties at position 4- have been synthesized and evaluated for their antimicrobial ...
An Approximation Leading To The Binomial Distribution In The Stochastic Treatment Of A Reversible Chemical Reaction
(
Qatar University
, 1992 , Article)
The exact equilibrium distribution of the number of molecules of C in the reversible chemical reaction A+B ^=S: C is shown to converge to the binomial distribution when N is finite,
M—»!K, K—>0 in such a way that KM is ...
Geochemistry of the st. Catherine basement rocks, Sinai, Egypt
(
Qatar University
, 1994 , Article)
St. Catherine area, dominated by basement rocks encompass old continental gneisses, metasediments, greenstone belt, calc-alkaline granites (G-II-granites), rift-related volcanies (RV), and anorogenic within plate granites ...
Role of Proteinases in the Degradation of the Major Storage Proteins of Linseed Germinating Seeds
(
Qatar University
, 1999 , Article)
The proteolytic activities of the germinating linseed using casein, azocoll and linseed globulin as substrates showed a steady increase until 48 hr of germination, followed with a rapid increase to reach a peak after 3 ...
The inhibitive action of sodium castor sulphonate Towards the corrosion of aluminium in Hydrochloric acid
(
Qatar University
, 1993 , Article)
The dissolution of aluminium in 2M HC1 solution in presence of sodium castor sulphonate (SCS) has been studied using thermometric and hydrogen evolution methods. The results showed that the additive retards the dissolution ...