Individual identity of alarm calls in wild-living Brandt's voles (Lasiopodomys brandtii).

We investigated acoustic variation responsible for the individuality of alarm calls produced by 50 Brandt's voles Lasiopodomys brandtii derived from 50 different wild-living colonies. For the first time, we described the calling pattern of Brandt's voles, producing a long series of short alarm calls with short inter-call intervals. The alarm calls displayed four different contours of fundamental frequency but were nevertheless strongly individually distinct within a series of 50 successive alarm calls per caller (2500 analyzed alarm calls).

In Vitro Hemocompatibility of Arabinogalactan, Betulin, and Betulin Derivatives.

The hemocompatibility of arabinogalactan, betulin and its derivatives was evaluated in vitro and samples suitable for creation of nanostructures or materials in contact with blood were selected. The prospects of arabinogalactan as a component of the construct (nanostructure) for drug delivery are due to the fact that it did not affect blood/plasma coagulation (at concentrations of 0.0033-3.

Sex-determining region complements traditionally used in phylogenetic studies nuclear and chloroplast sequences in investigation of Duby and Spach poplars (genus L., Salicaceae).

Members of the genus L. play an important role in the formation of forests in the northern hemisphere and are used in urban landscaping and timber production. species of closely related sections show extensive hybridization.

Comparison of ultrasonic isolation calls of pure-breeding and interspecies hybrid Phodopus dwarf hamster pups.

In mammalian cross-species hybrids, parameters of voice calls, produced by vocal fold vibrations, are intermediate between parental species. Inheritance of ultrasonic calls, produced by whistle mechanism, is unstudied for hybrids. We examined 4000 pup ultrasonic isolation-induced calls for peak power of call fundamental frequency and for call duration in 4-8-day-old captive hamsters of four Study Groups: pure Phodopus sungorus; pure P.

Meeting with a male can lead to stress: Female reaction to a pairing with a partner in Felidae.

The aim of this study was to test the hypothesis that the level of sexual dimorphism modulates the effects of male-female social interaction on the female physiological condition in felids. We predicted that: 1 - contacts of females with males in species with low level of sexual dimorphism in body size will not lead to significant changes in the activity of the hypothalamus-pituitary-adrenal axis (female stress); 2 - contacts of females with males in species with a high level of sexual dimorphism can result in significant increase in the cortisol level in females. Our study did not support these hypotheses.