Search

In Orange balloon Molly, Poecilia sphenops, the development of chronic stress due to continuous exposure to artificial LED lighting irrespective to photoperiod causes deterioration in the body colour even in the presence of carotenoid rich green water and artificial feed with added additives in the experimental fishtank setup. In the present study, the effects of continuous exposure to lighting and its consecutive development of chronic stress causes the body colouration to fade off in the freshwater ornamental live bearer, Poecilia sphenops, though the fishes were provided with colour enhancing as well as stress relievingfactors. Several trials showed that, whatever may be the colour enhancing agents provided, artificial lighting for long exposure irrelevant to the normal photoperiod remains as a strong anti-colouration as well as stress inducing factor and remains unaffected to any antagonistic factors. To conclude photoperiod is an essentialfactor to be concerned for colour enhancement in Poecilia sphenops.

Speech is the most convenient way of human communication. This paper describes the method of estimating basic acoustic features and vocal tract area function directly from the acoustics of speech wave form for estimation of vocal tract area function Linear Predictive Coding (LPC) based Auto regressive modelling of speech signal is used. LPC is one of power full speech analysis technique. This method predominant in speech researches to estimates basic acoustic features and Vocal Tract (VT) area function and to represent the speech for low bit rate transmission and storage applications. The vocal tract shape (area) estimation carried out by the approximation of acoustic tube model describes the phonetic distinctiveness and the individual speaker (gender) from the phonetics (vowels). The paper focused on the speaker specific dynamic changes of the area function. Paper presents the VT shape estimation for kannada vowels based on LPC, by considering the speaker individually among the vowels uttered by the different male and female speakers. The vowel utterances are recorded from the south Indian speakers. The process is implemented using MATLAB for inter speakers. The VT area functions for different speakers are investigated and the role of vocal tract variability as a parameter on speech analysis is carried out.

Human speech has hierarchical structure to have meaningful information. Speech is not a sequence of steady state sounds, abruptly changing from one to other. It consists of sentences, sentences can be divided in to words and words are constituted by phonemes which are the basic voice construction elements. We use language every day without devoting much thought to the process. But articulator movements i.e. the movement of lips, tongue and other organs- is among the subtlest and most adept of actions performed by human beings. In this paper vocal tract shape is estimated using LPC coefficients along with the combination of basic acoustic various speakers of different age, from each speaker with different vowels, consonants and different combinations. From the spectrogram we are extracting the formant frequency & all the considered test samples.

Mechanisms underlying resilience in ageing Y Stern, G Chételat, C Habeck, EM Arenaza-Urquijo, P Vemuri, A Estanga, ...Nature Reviews Neuroscience 20 (4), 246-246