Investigation of valuable economic features in F1– F2 pea hybrids

On iteration invariants for (F1,F2)-sensitivity and weakly (F1,F2)-sensitivity of non-autonomous discrete systems

In this paper, we let (X, f1,∞) be a non-autonomous discrete system on a compact metric space X. For a positive k, the properties P̂ (k) and Q̂(k) of Furstenberg families are introduced for any integer k > 0. Based on the two properties, we prove that (F1,F2)sensitivity and weakly (F1,F2)-sensitivity are invariant under iterations. MR(2000) Subject Classification: 54H20, 54B20, 37B99, 37D45.

Limitation of F1 hybrids uniformity law

Growth of channel catfish (Ictalurus punctatus), blue catfish (I. furcatus), and their F1, F2, F3, and F1 reciprocal backcross hybrids in earthen ponds.

The F1 hybrid between a channel catfish female (Ictalurus punctatus) × a blue catfish (I. furcatus) male outperforms both parental species in most environments. However, reproductive isolating mechanisms between the species made it difficult to mass produce the F1 hybrid for commercialization until recent improvements in hormone usage. This study was undertaken to mix the genomes of the 2 speci...

Cytogenetic characterization of F1, F2 and backcross hybrids of the Neotropical catfish species Pseudoplatystoma corruscans and Pseudoplatystoma reticulatum (Pimelodidae, Siluriformes)

The cytogenetic characteristics of Pseudoplatystoma corruscans and Pseudoplatystoma reticulatum and their F1, F2 and backcross hybrids were assessed by using chromosome banding techniques. The diploid number of 56 chromosomes was constant in all species and lineages, with a karyotypic formula containing 20 metacentric, 12 submetacentric, 12 subtelocentric and 12 acrocentric chromosomes. Nucleol...

investigation of (meta)discourse markers in elt coursebooks

the present study aimed to investigate representation of discourse markers and metadiscourse markers in conversations and readings of general elt coursebook series used in the language centers of iran. to this aim, four elt coursebooks popularly taught in language centers of this country were analyzed based on fung and carter’s (2007) framework regarding discourse markers and hyland’s (2005) fr...