Indian Agricultural Statistics Research Institute

About: Indian Agricultural Statistics Research Institute is a facility organization based out in New Delhi, India. It is known for research contribution in the topics: Population & Small area estimation. The organization has 454 authors who have published 870 publications receiving 7987 citations.

Stochastic analysis of environmental fluctuations in a compartmental system

Abstract: In this paper the general two-compartment system with environmental stochasticity is investigated. The transfer rates and outputs are assumed to be random telegraph processes. The Laplace-transform of the mean-value function of the amount of substance present in the two compartments is evaluated. The Gaussian white noise limit case is also discussed and the stability of the system is examined. It is shown that while the deterministic model is stable, environmental stochasticity may induce in the mean-value function all sorts of behaviour — stable, unstable and oscillatory. This is in contrast to the intrinsic stochasticity in linear models wherefor the mean-value function is the same as the solution of the deterministic counterpart.

Irrigation application efficiency and uniformity of water distribution using multi-outlet pipe and resource conservation technologies

Abstract: Irrigation experiments were conducted during November to April under wheat crop in the winter season of 2012-13 and 2013-14 in the farmer’s field at Galibkhedi village located in Karnal District, Haryana State, India In the study, collapsible multi-outlet pipe (MOP) along with single outlets pipe (SOP) was tested in farmer’s field under wheat cultivation Irrigation was carried out in five treatments including tillage (T) with SOP and MOP; zero-tillage (ZT) with SOP and MOP, and furrow irrigation with raised bed (FIRB) Iso-time profile of waterfront spreading and advance indicated that irrigation water distribution was uniform under the plot irrigated using MOP as compared to plot irrigated using SOP In addition, water distribution was uniform under zero tilled plots as compared to tilled plot Results implied that MOP has several advantages over SOP in terms of application efficiency (AE) and uniformity of water distribution Average application efficiency for the first study year was found to be in the order of ZT-MOP (8241%) > FIRB (7679%) > ZT-SOP (7525%) > T-MOP (7485%) > T-SOP (6979%) Average application efficiency for the second study year was found to be in the same order as first year with some deviation in values In the second year values of mean application efficiencies were ZT-MOP (8258%) > FIRB (7713%) > ZT-SOP (7304%) > T-MOP (6965%) > T-SOP (6613%) Overall, this study concludes that irrigation under wheat crop using collapsible multi-outlet pipe (MOP) with zero tillage practices is a suitable option for surface irrigation that accomplishes uniform distribution of water with higher application efficiency

Global classical and weak solutions of the prion proliferation model in the presence of chaperone in a banach space

Abstract: <p style='text-indent:20px;'>The present work is based on the coupling of prion proliferation system together with chaperone which consists of two ODEs and a partial integro-differential equation. The existence and uniqueness of a positive global classical solution of the system is proved for the bounded degradation rates by the idea of evolution system theory in the state space <inline-formula><tex-math id="M1">\begin{document}$ \mathbb{R} \times \mathbb{R} \times L_{1}(Z,zdz). $\end{document}</tex-math></inline-formula> Moreover, the global weak solutions for unbounded degradation rates are discussed by weak compactness technique.</p>

Optimum Fitting of Richards Growth Model in Random Environment

Abstract: Richards four-parameter nonlinear growth model is a very versatile model for describing many growth processes. Two limitations of the corresponding Richards nonlinear statistical model are discussed. Accordingly, in this article, the general approach of ‘Stochastic differential equations’ is considered. Ghosh and Prajneshu (J Indian Soc Agric Stat 71:127–138, 2017) developed the methodology for fitting Richards growth model in random environment, when one of the parameters, viz. m takes a particular value. Purpose of the present article is to extend this type of work by proposing the methodology, which is valid for all values of m. Relevant computer programs for its application are written and the same are included as an “Appendix”. Finally, as an illustration, pig growth data are considered and superiority of our proposed model is shown over the Richards nonlinear statistical model for given data.

Isolation and identification of carotenoid-producing yeast and evaluation of antimalarial activity of the extracted carotenoid(s) against P. falciparum

Abstract: Plasmodial resistance to a variety of plant-based antimalarial drugs has led toward the discovery of more effective antimalarial compounds having chemical or biological origin. Since natural compounds are considered as safer drugs, in this study, yeast strains were identified and compared for the production of carotenoids that are well-known antioxidants and this metabolite was tested for its antiparasitic activity. Plasmodium falciparum 3D7 strain was selected as the target parasite for evaluation of antimalarial activity of yeast carotenoids using in vitro studies. Data were analyzed by FACS (fluorescence-activated cell sorter) and counted via gold standard Giemsa-stained smears. The extracted yeast carotenoids showed a profound inhibitory effect at a concentration of 10–3 µg/µl and 10−4 µg/µl when compared to β- carotene as control. SYBR Green1 fluorescent dye was used to confirm the decrease in parasitaemia at given range of concentration. Egress assay results suggested that treated parasite remained stalled at schizont stage with constricted morphology and were darkly stained. Non-toxicity of carotenoids on erythrocytes and on human liver hepatocellular carcinoma cells (HepG2 cells) was shown at a given concentration. This report provides strong evidence for antimalarial effects of extracted yeast carotenoids, which can be produced via a sustainable and cost-effective strategy and may be scaled up for industrial application.