Eleven populations of five Avena species were analysed for meiotic characters including chiasma frequency and distribution as well as chromosomal association and segregation. Plants of a single population of A. eriantha showed the presence of 2n = 14 (diploid) and 2n = 4x = 28 chromosome number. Populations of A. barbata and A. wiestii possessed n = 14, while populations of A. sterilis ssp. lud...

aim: this study investigates the intraspecific competition, for food and density amongst larvae of anopheles stephensi (main malaria vector in south iran). material & methods: the effects of 4 selected food quantities (1x,2x,4x,6x) and 5 larval densities (0.1 to 3 larva/cm2) were tested individually or in combination on 7 biological indexes of the vector and the results were statistically ...

eleven populations of five avena species were analysed for meiotic characters including chiasma frequency and distribution as well as chromosomal association and segregation. plants of a single population of a. eriantha showed the presence of 2n = 14 (diploid) and 2n = 4x = 28 chromosome number. populations of a. barbata and a. wiestii possessed n = 14, while populations of a. sterilis ssp. lud...

PURPOSE To characterize the effect of passive vertical head motion on dynamic visual acuity of young, normally sighted subjects wearing telescopic spectacles, and to relate this to the velocity of images on the retina. METHODS Static visual acuity was measured without motion. Dynamic visual acuity was measured during vertical, sinusoidal motion of either optotypes or of a servo-driven rotatin...

The Chebyshev polynomials have many beautiful properties and countless applications, arising in a variety of continuous settings. They are a sequence of orthogonal polynomials appearing in approximation theory, numerical integration, and differential equations. In this paper we approach them instead as discrete objects, counting the sum of weighted tilings. Using this combinatorial approach, on...

one hundred and twenty iranian accessions of aegilops crassa with origin from different geographical areas of iran, were evaluated for variation in high molecular weight glutenin subunit (hmw-gs) composition. the results showed different banding patterns between hexa (6x) and tetra-ploid (4x) as well as within different ploidy accessions. eleven allelic variants were observed in glu- dcr1 locus...

Bu çalışma, Orta Karadeniz Bölgesi doğal florasından toplanan domuz ayrığı (Dactylis glomerata ssp.), kamışsı yumak (Festuca arundinaceae ssp.) ve ak üçgül (Trifolium repens popülasyonlarının çekirdek DNA içeriklerinin flow sitometri yöntemiyle belirlenmesi ploidi analizi ile tür teşhisinde kullanılması amacıyla yürütülmüştür. Proje kapsamında üçgülden mera tipi 80, ayrığından ot 80 yumaktan ot...

Polyploidy plays a major role in the evolution of angiosperms with multiple paleopolyploid events having been suggested making it plausible that all angiosperms have a polyploid event in their history. Polyploidy can arise by genome duplication within a species (i.e., autopolyploidy), or whole genome duplication coupled with hybridization (i.e., allopolyploidy). Penstemon subsection Saccanthera...