Beena R. Gupta

Bio: Beena R. Gupta is an academic researcher from University of Delhi. The author has contributed to research in topics: Phase space & Chaotic. The author has an hindex of 2, co-authored 4 publications receiving 6 citations.

Post harvest surveys of wheat grains for the presenge of Karnal bunt and black point diseases in different agroclimatic zones of India

Abstract: The analysis of harvested grain samples of wheat grown in different agroclimatic zones of India was done at Karnal and other cooperation centre from 1991–92 to 1994–95 crop seasons. A total, 18,895 samples of grains from farmers' fields and grain ‘mandles’ and about 4,000 samples from experimental fields were collected and examined for the presence of Karnal bunt and black point infected grains. The incidence of Karnal bunt varied in different agroclimatic zones and wheat srains from states like Karnataka, Maharashtra, Gujarat, Bihar, Assam, Manipur, higher hills of Uttar Pradesh (Now in Uttaranchal) Himanchal Pradesh (except Poanta valley) were free from Kamal, bunt whereas low incidence was detected in Madhya Pradesh, Rajasthan, southwestern Haryana, Delhi and western Uttar Pradesh except farm districts (0.01–17.2%). The samples collected from experimental fields had lower percentage of infected samples as compared to those collected from farmers' fields and rnandies. The grain samples collected from states like Karnataka, Maharashtra, Gujarat, Bihar and higher hills of H.P. and U.P. (now Uttaranchal were found free from Karnal bunt from 1991–92 to 1994–95 crop seasons in spite of the fact that seeds from the endemic areas like Haryana and Punjab was planted in these states thus indicating presence of unfavourable weather conditions for Kamal bunt development (warmer temperature and dry conditions) at flowering stage of wheat. The black point was present in all the states but its incidence was higher in the states having warmer and dry weather as compared to hilly regions.

Time-Frequency Analysis of Asymmetric Triaxial Galaxy Model Including Effect of Spherical Dark Halo Component

Abstract: A method of time-frequency analysis (TFA) based on wavelets is applied to study the phase space structure of three-dimensional asymmetric triaxial galaxy enclosed by spherical dark halo component. The investigation is carried out in the presence and absence of dark halo component. Time-frequency analysis is based on the extraction of instantaneous frequency from the phase of the continuous wavelet transform. This method is comparatively fast and reliable. This method can differentiate periodic from quasi-periodic, chaotic sticky from chaotic non-sticky, ordered from chaotic and also, it can accurately determine the time interval of the resonance trapping and transitions too. Apart from that, the phenomenon of transient chaos can be explained with the help of time-frequency analysis. Comparison with the method of total angular momentum (denoted as Ltot) proposed recently is also presented.

Characterization of the Phase Space Structure of Circular Restricted Three-Body Problem: An Alternative Approach

Abstract: In this paper, we have considered Time-Frequency Analysis (TFA) and Poincare Surface of Section (PSS) for the study of the phase space structure of nonlinear dynamical system. We have examined a sample of orbits taken in the framework of Circular Restricted Three-Body Problem (CRTBP). We have computed ridge-plots (i.e. time-frequency landscape) using the phase of the continuous wavelet transform. Clear visualization of resonance trappings and the transitions is an important feature of this method, which is presented using ridge-plots. The identification between periodic and quasi-periodic, chaotic sticky and nonsticky and regular and chaotic orbits are done in comparatively less time and with less computational effort. The spatial case of Circular Restricted Three-Body problem is considered to show the strength of Time-Frequency Analysis to higher dimensional systems. Also, with the help of ridge-plots, we can visualize the phenomenon of transient chaos.

Identification of a Time-Varying Curve in Spectrogram

Abstract: In this study a process of acquiring a trend of significant spectral coefficients of Photonic Doppler Velocimetry (PDV) data is proposed. The novelty of the paper is the design of a methodology which will allow to find a specific curve describing data of aluminium metal plate acceleration by detonation products of brisant high explosive obtained using PDV in time on the basis of frequency response. The paper combine short time Fourier Transform (STFT), timefrequency varying autoregressive process (TFAR) to specify the description of detonation products from both time and frequency perspectives. We also investigate the identification of a curve describing such behavior of frequency response on time in processed spectrogram.

Variability characterization of Bipolaris sorokiniana populations causing black point disease in wheat

Abstract: Ten monoconidial isolates of Bipolaris sorokiniana from wheat seed of distant localities were tested for their variability. In pathogenic capabilities, the isolates differed strikingly irrespective of the host. The isolate from Sabour, Bihar was found to be most virulent followed by Kumarganj, UP; Hissar, Haryana and Ludhiana, Punjab. Colony characters of Kumarganj and Sabour isolates showed fastest growth, wavy with raised central zone, grayish black colour and irregular margin whereas Kalyani and Durgapura were slow growing isolates. Sporulation varied from fair to excellent with different isolates, but no definite relation was established. In conidiophore and conidial characters, the average length of conidiophore of Kumarganj isolate was maximum (143.32μ) as against the Dharwad, Karnataka isolate which had the minimum (132.52μ) average length. The average length of conidia of Kumarganj isolate was maximum (70.99μ) against the minimum (55.33μ) in Kalyani isolate. Maximum average width of conidia and conidiophore was associated with Sabour and Srinagar isolates, respectively. Regarding conidial germination percentage and its pattern, Sabour isolate resulted in the maximum (99%) germination with bipolar germination pattern followed by Kumarganj, Rewa, Ludhiana, Srinagar, Dharwad, Hissar, Mahabaleshwar, Kalyani and Durgapura isolates.

A Physiologically Regulated Multidomain Cystatin of Wheat Shows Stage-Dependent Immunity Against Karnal Bunt (Tilletia indica)

Abstract: To identify novel components of basal resistance against the Tellitia indica of wheat, breeding for disease resistance was carried out on resistant and susceptible genotype of Karnal Bunt. The different members of wheat cystatin gene families were cloned, and their role in triggering differential resistance through co-expression was analyzed in our lab. The multidomain wheat cystatin (WCM) is a proteinase inhibitor characterized by cloning the gene from susceptible (WH542) and resistant genotype (HD 29). A WCM cDNA was isolated from both genotypes and sequenced. The WCM had a highly conserved N-terminal cystatin domain and a long C-terminal extension containing a second region, which exhibited similarity to the cystatin domain. The expression level was significantly (P > 0.001) higher in resistant compared to susceptible genotype at all the physiological stages of wheat spikes. In order to characterize the biochemical properties of WCM, the coding sequence was expressed in Escherichia coli using pET expression vector. The recombinant WCM was purified from soluble fraction of the cell extract by using affinity chromatography. WCM, with 23 KDa molecular mass, showed cysteine proteinase inhibitory activity against papain (Ki 3.039 × 10−7 M) as determined by using BAPNA as substrate. Furthermore, it was able to arrest the fungal mycelial growth of T. indica. Hyphae growth was inhibited, and morphological changes such as swelling and fragmentation of the fungus were observed. Overall, these observations suggest an endogenous high expression of cystatin, possibly associated with the resistance of wheat against Karnal bunt.

Frequency analysis of Halo orbits in the Sun-Mercury system

Abstract: Mercury is the planet which gains maximum radiation pressure from the Sun. On 20th October 2018 Bepicolombo was launched to do the comprehensive study of the magnetic field, magnetosphere, surface and internal structure of the Mercury. For this we need to maintain the nominal multi-revolution halo orbits. In this paper, we have considered the Sun-Mercury-satellite in the model of restricted three body problem with zero eccentricity. Here continuation method have been used to obtain the halo orbits around the Libration points L1 and L2 . We observe that the frequencies remain constant throughout the time interval using wavelet transform. The ridge plot at the initial guess confirms the periodicity of the halo orbits.