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...

background: cytokines are cell signaling molecules which upon release by cells facilitate the recruitment of immune-modulatory cells towards the sites of inflammation. genetic variations in cytokine genes are shown to regulate their production and affect the risk of infectious as well as autoimmune diseases. intron-3 of interleukin-4 gene (il-4) harbors 70-bp variable number of tandem repeats (...

an investigation was carried out to study the developmental time, reproduction and life table of three populations of the onion thrips, thrips tabaci lindeman, on onion (khorasan and golestan populations) and also on tobacco (mazandaran population) in the laboratory at 25â°c, 50% rh and 16: 8 h l: d. the total life cycle from egg to adult of khorasan, golestan and mazandaran populations were ga...

to evaluate the genetic diversity of native populations of crown imperial (fritillaria imperialis l.) in zagross region, issr molecular along with 32 morphological traits were employed. a number of 160 samples corresponding to eight zagross populations distributed in six provinces were collected and assessed. using six primers, 57 bands were totally produced from which 49 were polymorphic. mean...

persian gazelle, gazella subgutturosa, exists throughout arid and semiarid regions of iran and has a key role in these frail ecosystems. habitat degradation and population decline has placed it on the list of vulnerable species in 2008. the phylogenetic relationships of three persian gazelle populations in the central part of iran (i.e. ghamishlou national park and wildlife refuge, mouteh wildl...

a total of 2519 blood samples were collected from five distinct populations of larestan, in fars province, in iran (lar, gerash, khour, latifi and berake) were examined for abo and rh blood groups. the gene frequencies obtained from these samples were compared with the hitherto reported corresponding data from other populations of fars province to determine the genetic structure of the larestan...

the term “serological epidemiology” is based to describe a method which has unique applications in comparing the immunologic status and health experiences of various populations, especially among populations for which morbidity data and vital statistics are scanty or completely lacking, or for inaccessible areas where the collection of serum is made with difficulty. serologic and hematological ...

kutum is considered as one of the anadramous species of the caspian sea. due to continuous population decline of the fish since 1975, iranian fisheries organization started to restock this species. nowadays, there is growing concern over the effects of restocking on natural populations. for this purpose, population structure and genetic variation of this species in the iranian coastline of casp...

spotted amber ladybird, hippodamia variegata (goeze, 1777) (coleoptera: coccinellidae) is an important predator of aphids and some other insect pests. since shape and size variation may affect biological characteristics of an insect, multivariate analysis of shape variations in four geographically isolated populations of h. variegata (isfahan, shahrekord, shiraz, yasuj) was performed based on e...