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Qiongshan, China

Hainan Normal University , is located in Haikou city and is the province's oldest institution for higher learning. Over 20,000 students are enrolled, including about 200 foreigners.The 3,347 sq. metre campus is also home to The Secondary School Teacher’s Continuation Education Centre of Hainan and the Training Centre for Higher Learning Institution are also located on the campus. In 2008, a new campus opened in Guilinyang Town, several kilometres southeast of Haikou. Wikipedia.

Li D.,Hainan Normal University
Journal of Computational and Theoretical Nanoscience

DNA sequences are composed of four nucleotides, which usually defined over the alphabet {A, G, C, T}. Generally, analysis of DNA sequences should be considered not only the strings' structures but also their chemical structures. In terms of classifications of the four bases, (0, 1)- characteristic sequences of a DNA sequence can be obtained, which can reveal its different functions. Three models are constructed based on the conditional LZ complexity measure which takes chemical properties as its side information to analyze the similarities among different species. This method does not require sequence alignment and is totally automatic. Reasonable results are obtained by three models, which are largely in agreement with previously published results based on the analysis of identical data sets. Copyright © 2013 American Scientific Publishers. Source

Wang J.C.,Hainan Normal University
Dong wu xue yan jiu = Zoological research / "Dong wu xue yan jiu" bian ji wei yuan hui bian ji

In this study,spectra analysis was conducted to investigate the sexual dichromatism and relationship between body color and quality of the red-eared slider turtle (Trachemys scripta). Visual modeling revealed that the differences of the hues of body colors' ultraviolet (UV) components between male and female were significant. Moreover, the visible(VIS)components of the hues of forelimbs were correlated with body qualities of male but not of female. Our results indicated that UV might act as a signal for sexual cognition in red-eared slider turtles, and female might evaluate male by the VIS components of the hues of forelimbs. These findings provided preliminary results and perspectives to the sexual dichromatism and sexual selection behaviors of red-eared slider turtles. Source

Yang C.C.,Hainan Normal University
Dong wu xue yan jiu = Zoological research / "Dong wu xue yan jiu" bian ji wei yuan hui bian ji

Animal coloration has many adaptive functions and plays an important role in signal communication both among intra- and interspecies. For example, it has been widely used in mate choice, intrasexual competition, and as aposematic or cryptic coloration in predator avoidance. Many colors and pigments also function in microbial resistance, structural support, photoprotection, and thermoregulation. Differing from human vision, based on RGB system, many other animals have tetrachromatic vision system, which includes the ultraviolet (UV) range that is undetectable by human eyes. Previous studies showed that ultraviolet is important in some species' social signaling and communication. Moreover, cone inner segments of most classes of vertebrate contain an oil droplet, which acts as a cut-off filter absorbing wavelengths below a critical value, and transmitting longer wavelengths. Animal and human vision is significantly different in that the classification of color by human standards may be a misleading for measuring animal coloration. Here, we illuminate how to use fiber spectrophotometer to quantify animal coloration, and analyze it by spectra analysis and visual modeling. As an example, we obtained plumage reflectance spectra from male and female scarlet minivets (Pericrocotus flammeus). This bird species is sexually dimorphic that the males have plumage color in black and red, while the females have grey and yellow accordingly. These plumage colors are typically generated from melanin and carotenoid pigments, which have an effect on antioxidant activity. Analysis of spectra segments provides hue, chroma, brightness and relative brightness of each wave range. Visual modeling maps color patches on tetrahedral color space and Robinson projection, meanwhile, calculates color span and color space volume which describe the color contrast and color diversity, respectively. In visual modeling, ambient light irradiance and spectral sensitivity of animal retinas are included, which provides an objective evaluation of coloration of animal vision. Source

Liang W.,Hainan Normal University | Moller A.P.,University Paris - Sud
Journal of Avian Biology

Hosts of brood parasites defend their nests against parasitism by aggression and subsequently, if parasitized, by rejection of the parasite egg or nestling. Cuckoos have evolved plumage mimicry with convergence towards the phenotype of Accipiter hawks that are common predators of cuckoo hosts. Here we tested two alternative hypotheses 1) whether barn swallows Hirundo rustica have evolved less aggressive behavior towards cuckoos in areas of sympatry with more abundant Accipiter hawks; and 2) whether barn swallows have evolved more aggressive anti-parasite behavior in areas with a single species of cuckoo. We presented dummies of common cuckoo Cuculus canorus, sparrowhawk Accipiter nisus and Oriental turtledove Streptopelia orientalis (a benign control) at the nests of barn swallows during breeding, while recording intensity of response and proximity of barn swallows to the dummy. We demonstrated that cuckoos moved away when attacked aggressively and approached more closely by barn swallows showing that barn swallow behavior was efficient at driving away cuckoos. Barn swallows were significantly more aggressive and approached cuckoo and sparrowhawk dummies more closely in Denmark than in China, despite sparrowhawks being relatively more common in Denmark. Responses towards cuckoo dummies differed from responses towards sparrowhawk dummies, showing that barn swallows distinguished between the two different causes of danger. These findings are inconsistent with a less aggressive response towards cuckoo dummies in areas of sympatry with more abundant Accipiter hawks, but consistent with the alternative hypothesis that barn swallows have evolved more aggressive behavior towards cuckoos in areas with a single species of brood parasite, but not in areas with multiple species of parasites, where it is harder for hosts to tell the difference. © 2014 The Authors. Source

Cui S.-L.,Beijing University of Technology | Cui S.-L.,Hainan Normal University | Xue Z.,Beijing University of Technology
Physical Review D - Particles, Fields, Gravitation and Cosmology

In this paper, using matching method in the probe limit, we investigate some properties of a holographic superconductor in Gauss-Bonnet gravity with Born-Infeld electrodynamics. We discuss the effects of the Gauss-Bonnet coupling α and the Born-Infeld parameter b on the critical temperature and condensate. We find that both α and b make the critical temperature decrease, which makes it more difficult for the condensate to form. Moreover we study the magnetic effect on the holographic superconductor and obtain that the ratio between the critical magnetic field and the square of the critical temperature increases from zero as the temperature is lowered below the critical value Tc, which agrees well with previous results. We also find that the critical magnetic field is indeed affected by the Gauss-Bonnet coupling, but not by the Born-Infeld parameter. © 2013 American Physical Society. Source

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