Here we aim to reveal the origin, distribution and mechanisms leading to the linked organisation of rDNA in the Asteraceae by analysing unit structure (PCR, Southern blot, sequencing), gene copy number (quantitative PCR) and chromosomal position (FISH) of 5S and 35S rRNA genes in ~200 species representing the family diversity and other closely related groups.
While previous empirical studies have compared the energetic cost of swimming in anteriorly and posteriorly positioned fish, the assessment of the advantages of group living must, by definition, be based on the comparison against a state of being alone.
The first four motifs identified for each fish are very similar in both sequence and position between fishes.
Hg concentrations in fish muscle were closely linked to the feeding regime and position of fish in the food webs.
This study was designed to analyze the magnitude of isotope enrichment in fish and thus to provide the basis for a better understanding of the dietary sources and trophic position of fish.
The traditional position — the fish's position — was: Don't save us from ourselves.
The only book we can think of that strikes a middle position about fish is Hemingway's "To Have and To Have Not," and the Library probably doesn't care to put this book in the hands of the junior trade.
Stable isotope analysis has been used to evaluate dietary sources and the trophic position of fish.
The significant influence of the number and position of fish sperm sample straws in uncontrolled cooling devices on post-thaw spermatozoa parameters, such as motility and fertilizing ability, is presented in this study.
Carbon and nitrogen stable isotopes (δ13C and δ15N) are increasingly used to evaluate the relative contributions of different food sources and the trophic position of fish (Anderson et al. 1987; Lochman and Phillips 1996; Gu et al. 1996a, b; Gamboa-Delgado et al. 2008).
