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Bordetella pertussis risA, but not risS, is required for maximal expression of Bvg-repressed genes
(
American Society for Microbiology
, 2005 , Article)
Expression of virulence determinants by Bordetella pertussis, the primary etiological agent of whooping cough, is regulated by the BvgAS two-component regulatory system. The role of a second two-component regulatory system, ...
Isolation and characterization of extracellular bioflocculants produced by bacteria isolated from Qatari ecosystems
(
POLISH SOCIETY OF MICROBIOLOGISTS
, 2008 , Article)
Compared with conventional synthetic flocculants, bioflocculants has special advantages such as safety, strong effect, biodegradable and harmlessness to humans and the environment, so they may potentially be applied in ...
Analysis of particulate behavior in porous media
(
Shanghai University Press
, 2008 , Article)
In this work, we analyze the behavior of the particle phase in the flow of a particle-laden mixture through a porous medium. An attempt is made to model the diffusion and dispersion processes, and to quantify the deviation ...
Volatile Components of the Phaeophyceae Hormophysa cuneiformis Growing Along Qatar Coasts
(
Qatar University
, 2007 , Article)
The present work deals with the study on volatile compounds from the brown alga Hormophysa cuneiformis collected from the Northwest coast of Qatar on May 2002. Two extraction methods have been used: conventional hydrodistillation ...
High prevalence of the risk of overweight and overweight among Qatari children ages 9 through 11
(
Emerald
, 2009 , Article)
Purpose – The purpose of this paper is to estimate the prevalence of the risk of overweight and
overweight in Qatari children ages 9 through 11 and to compare the prevalence using CDC and IOTF
cut-offs.
Design/methodo ...
Developmental Stages of the Acquisition of Negation and interrogation by Children Native Speakers of Qatari Dialect
(
Qatar University
, 2002 , Article)
The developmental stages of Qatari Dialect interrogatives and negatives are described in this paper. Four children were included in this study, ranging in age from one year and six months to nine years. According to the ...
Mitochondrial phylogeography illuminates the origin of the extinct caspian tiger and its relationship to the amur tiger
(
Public Library of Science
, 2009 , Article)
The Caspian tiger (Panthera tigris virgata) flourished in Central Asian riverine forest systems in a range disjunct from that of other tigers, but was driven to extinction in 1970 prior to a modern molecular evaluation. ...
Preliminary Survey on Parasites Infecting Some Amphibian and Reptilian Species from United Arab Emirates and Qatar
(
Qatar University
, 2002 , Article)
The common amphibian toad Bufo orientalis and four species of reptiles (Scincus muscatensis, Mabuya brevicolis, Uromastyx microlepis and Diplometopon zarudnyi) were collected from five localities in the United Arab Emirates ...
Synthesis, spectroscopic and thermal structural investigations of the charge-transfer complexes formed in the reaction of 1-methylpiperidine with σ- and π-acceptors
(
Elsevier B.V.
, 2009 , Article)
The reactions of the electron donor 1-methylpiperidine (1MP) with the π-acceptors 7,7,8,8-tetracyanoquinodimethane (TCNQ), tetracyanoethylene (TCNE), 2,3-dichloro-5,6-dicyano-p-benzoquinone (DDQ), 2,3,5,6-tetrachloro-1,4 ...
Synthesis, spectroscopic and thermal investigations of solid charge-transfer complexes of 1,4,7-trimethyl-1,4,7-triazacyclononane and the acceptors iodine, TCNE, TCNQ and chloranil
(
Elsevier
, 2008 , Article)
The solid charge-transfer complexes formed in the reaction of the electron donor 1,4,7-trimethyl-1,4,7-triazacyclononane (TMTACN) with the acceptors iodine, tetracyanoethylene (TCNE) and 7,7,8,8-tetracyanoquinodimethane ...