تصفح Biological & Environmental Sciences حسب تاريخ النشر
السجلات المعروضة 21 -- 40 من 812
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Man-made impact on the geochemistry of the Nile delta lakes. A study of metals concentrations in sediments
( Kluwer Academic Publishers , 2004 , Article)Forty two sediment samples were collected from four River Nile northern delta lakes (Mariut, Edku, Burullus and Manzalah) to asses the man-made impact on their environment during the last 20 years. Due to the continuous ... -
Competition, facilitation, and niche differentiation in two foliar pathogens
( Springer Berlin / Heidelberg , 2004 , Article)We studied competition between the obligate biotroph Puccinia triticina (designated here as Puccinia) and the facultative saprophyte Pyrenophora tritici-repentis (designated here as Pyrenophora) in older and younger leaves ... -
Helminth parasite larvae collected from Arabian Gulf Fish. 4. description of 4 larvae including two metacercarae, one didymozoid and one acanthocephalan from Emirati coasts
( Arabian Gulf University , 2005 , Article)Four hilminth larvae from different fish hosts caught from Emirati coasts are described. Two are metacercariae related to genus Stephanostomum, type (I) and (II). Type (I) was found encycsted in body cavities of the Indian ... -
Knockout mice: Is it just genetics? Effect of enriched housing on fibulin-4+/- mice
( Public Library of Science , 2007 , Article)Background. Fibulin-4 is an extracellular matrix protein expressed by vascular smooth muscle cells that is essential for maintaining arterial integrity. Fibulin-4-/- mice die just before birth due to arterial hemorrhage, ... -
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 ... -
Assessment of water bodies of united arab emirates coastal sabkhas as potential sites for natural salinity gradient solar ponds
( ASCE - American Society of Civil Engineers , 2008 , Article)Increasing population and growing demands from both agriculture and industry in the United Arab Emirates (UAE) necessitate the need to provide inexpensive fresh water. The only feasible source of such water is desalination. ... -
Ecophysiology of Limonium axillare and Avicennia marina from the coastline of Arabian Gulf-Qatar
( Springer Science + Business Media B.V. , 2008 , Article)Attention is being focused on the coastline from Doha to Ras Laffan in Qatar since higher activities in the development of land and establishment of roads, highways and new buildings and houses is not coupled by serious ... -
Present day inbreeding does not forbid the forensic utility of commonly explored STR loci: A case study of native Qataris
( Elsevier Ireland Ltd. , 2008 , Article)Allele frequency distribution of 15 short tandem repeat (STR) loci (D8S1179, D21S11, D7S820, CSF1PO, D3S1358, TH01, D13S317, D16S539, D2S1338, D19S433, vWA, TPOX, D18S51, D5S818, and FGA) was studied in a sample of 120 ... -
Molecular phylogeny of Qatari date palm genotypes using Simple Sequence Repeats markers
( Asian Network for Scientific Information , 2009 , Article)The objectives of the present study is to analyze the genetic diversity among 15 different cultivars of date palm at the experimental farm of Qatar University using Simple Sequence Repeat (SSR) markers and find out the ... -
Phylogeography of lions (Panthera leo ssp.) reveals three distinct taxa and a late Pleistocene reduction in genetic diversity
( Blackwell Publishing Ltd , 2009 , Article)Lions were the most widespread carnivores in the late Pleistocene, ranging from southern Africa to the southern USA, but little is known about the evolutionary relationships among these Pleistocene populations or 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. ... -
Maintaining the genetic health of putative Barbary lions in captivity: an analysis of Moroccan Royal Lions
( Springer Berlin / Heidelberg , 2009 , Article)The last representatives of the Barbary lion (Panthera leo leo), once numerous in North Africa but exterminated from the wild by the 1940s, are believed to be the captive lions descended from the Moroccan Royal Collection, ... -
The Gulf: A young sea in decline
( Elsevier Ltd , 2009 , Article)This review examines the substantial changes that have taken place in marine habitats and resources of the Gulf over the past decade. The habitats are especially interesting because of the naturally high levels of temperature ... -
Phylogenetic analyses of peanut resistance gene candidates and screening of different genotypes for polymorphic markers
( Elsevier , 2009 , Article)The nucleotide-binding-site-leucine-rich-repeat (NBS–LRR)-encoding gene family has attracted much research interest because approximately 75% of the plant disease resistance genes that have been cloned to date are from ... -
Global patterns and predictions of seafloor biomass using random forests
( Public Library of Science , 2010 , Article)A comprehensive seafloor biomass and abundance database has been constructed from 24 oceanographic institutions worldwide within the Census of Marine Life (CoML) field projects. The machine-learning algorithm, Random ... -
Evidence of the Involvement of E358, A498 and C571 of a New Cry1Ac δ-endotoxin of Bacillus thuringiensis in its High Insecticidal Activity Against Ephestia kuehniella
( Humana Press Inc , 2010 , Article)A new cry1Ac-type gene was cloned from Bacillus thuringiensis strain BLB1, sequenced and expressed. The deduced amino acid sequence of the polypeptide has a predicted molecular mass of 132.186 kDa. The amino acid sequence ... -
Comparative study of Bacillus thuringiensis Cry1Ia and Cry1Aa delta-endotoxins : activation process and toxicity against Prays oleae
( Elsevier Inc. , 2010 , Article)Cry1Ia and Cry1Aa proteins exhibited toxicities against Prays oleae with LC(50) of 189 and 116 ng/cm(2), respectively. The ability to process Cry1Ia11 protoxin by trypsin, chymotrypsin and P. oleae larvae proteases was ... -
Involvement of oxidative stress and growth at high cell density in the viable but nonculturable state of Photorhabdus temperata ssp. temperata strain K122
( Elsevier Ltd , 2010 , Article)Photorhabdus temperata ssp. temperata strain K122 represents a promising source of bioinsecticide. When cultured in an optimized medium, P. temperata exhibited restricted survival in terms of colony-forming ability on solid ... -
Antifungal activities of an endophytic Pseudomonas fluorescens strain Pf1TZ harbouring genes from pyoluteorin and phenazine clusters
( Springer Netherlands , 2010 , Article)Pseudomonas fluorescens Pf1TZ was inhibitory in vitro to a number of phytopathogenic fungi and could protect vine plantlets against Botrytis cinerea. Total protection was reached after 3 weeks of bacterial inoculation. The ... -
Rotavirus strain diversity in the Centre Coast of Tunisia from 2000 through 2003
( Oxford University Press , 2010 , Article)An epidemiological survey investigating rotavirus infection in children was undertaken in the coastal region of Tunisia from January 2000 through September 2003. A total of 309 fecal specimens were screened by enzyme-linked ...