One of the most efficient mechanisms to keep animal lineages separate is a difference in ploidy level (number of whole genome copies), since hybrid offspring from parents with different ploidy level are functionally sterile. In the freshwater fish family Botiidae, ploidy difference has been held responsible for the separation of its two subfamilies, the evolutionary tetraploid Botiinae and the ...

Figure 1. Molecular readouts of the circatidal clock. (A) Section of representative actogram depicting mean spontaneous swimming activity of E. pulchra (n = 21, period = 12.5 ± 0.1 h; see [2] for methods) HW: predicted high water on home beach. (B) Representative western blot of overoxidised peroxiredoxin and loading control. (C) Relative intensity of overoxidised peroxiredoxin signal from E. p...

Cephalopod specimens assigned to the Argonautidae ( Obinautilus pulchra Kobayashi, 1954 and an unknown taxon) from two localities of Mishan Formation in Gohreh Khorgu sections, Bandar Abbas, southern Iran, are reported for first time Persian Gulf area. The co-existing foraminifera confirm middle Miocene age strata. Based on micropalaeontological data, previous Oligocene Obinautilus pulchra is e...

Objective: The present study aimed to the isolation and characterization of phytochemicals from tissue cultures of Arnebia hispidissima. The isolated compounds were evaluated for their antioxidant and antimicrobial activities. Materials and Methods: Six derivatives of alkannin and shikonin were isolated and characterized by using various physical and spectroscopic techniques from callus tissue ...

Flowering dogwood (Cornus florida L.) is used as an important ornamental tree in North America, Japan, and Europe. Since 1995, epidemics of powdery mildew caused by Erysiphe pulchra (Cooke and Peck) U. Braun & S. Takamatsu (syn. Microsphaera pulchra Cooke and Peck) have impeded production of flowering dogwood throughout much of the eastern United States. The fungus is an obligate parasite and g...

In recent years, there has been an increase in the rate and severity of diseases affecting habitat-forming marine organisms, such as corals, sponges, and macroalgae. Delisea pulchra is a temperate red macroalga that suffers from a bleaching disease that is more frequent during summer, when seawater temperatures are elevated and the alga's chemical defense is weakened. A bacterial cause for the ...

The flavonoids of two diploid species of Phlox and two of their allotetraploid derivatives were characterized. The tetraploids accumulate five flavonoids not observed in the parental species. Generally, novel compounds are less highly glycosidated than, but otherwise similar to, parental compounds that they partially or totally replace. We propose that hybridity and polyploidy have repressed or...