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Cytokinins Enhance Sugar-Induced Anthocyanin Biosynthesis in Arabidopsis
Prasanta Kumar Das,박연일,신동호,최상봉,유상동,최길주 한국분자세포생물학회 2012 Molecules and cells Vol.34 No.1
In higher plants, the regulation of anthocyanin synthesis by various factors including light, sugars and hormones is mediated by numerous regulatory factors acting at the transcriptional level. Here, the association between su-crose and the plant hormone, cytokinin, in the presence of light was investigated to elucidate cytokinin signaling cascades leading to the transcriptional activation of anthocyanin biosynthesis genes in Arabidopsis seedlings. We showed that cytokinin enhances anthocyanin content and transcript levels of sugar in-ducible structural gene UDP-glucose:flavonoid 3-O-glucosyl transferase (UF3GT) and regulatory gene PRODUCTION OF ANTHOCYANIN PIG-MENT 1 (PAP1). Genetic analysis showed that cytokinin signaling modulates sugar-induced anthocyanin biosynthesis through a two-component signaling cascade involving the type-B re-sponse regulators ARR1, ARR10 and ARR12 in a redundant manner. Genetic, physiological and molecular biological approaches demonstrated that cytokinin en-hancement is partially dependent on phytochrome and cryptochrome downstream component HY5, but mainly on photosynthetic electron transport. Taken together, we suggest that cytokinin acts down-stream of the photosynthetic electron transport chain in which the plastoquinone redox poise is modulated by sugars in a photoreceptor independent manner.
Spatial Temporal Analysis of Freight Flow through Indian Major Seaport System
Prasanta K. Sahu,Abhishek PADHI,Gopal R. Patil,Gangadhar MAHESH,Ashoke K. SARKAR 한국해운물류학회 2019 The Asian journal of shipping and Logistics Vol.35 No.1
This paper analyzed the space time interactions among the freight flows through major Indian ports. Freight flow data at regular intervals in the form of spatial time series were collected for the twelve major ports located along the east and west coast of India. The system of freight flows was modeled through interactions both in time and space dimensions as a multivariate stochastic process. Effect of the neighbor port freight on a subject port was analyzed to understand the degree of dependency among the competing/non-competing ports. Demand elasticity analysis suggested that ports are more sensitive to changes in their own demand over time than the corresponding spatial changes indicating bulk of the demand dependency on hinterland economic activity. Interestingly, only two ports are found to be competing with each other as they share common hinterland. In general, it can be inferred that the interport relationship within Indian major port system is complimentary or co-operative. Proposed models can be used for assessing the impact of freight flow changes from one port to the nearest neighboring port. Study findings will help port authorities and policy makers for holistic development of port system by making right investments in required locations to promote balanced development. It has also implications towards formulating policies on port development considering Government of India's preferred mode of choice for infrastructure development is PPP, and policy formulation for this mode of development is required to address competition concerns considering the high sunk cost associated with ports development.
STUDY OF SOME GENERALIZED h-VARIATIONAL INEQUALITY PROBLEMS IN H-PSEUDOSPACE
Prasanta K. Das,Satya N. Mishra,Sapan K. Samal 경남대학교 기초과학연구소 2021 Nonlinear Functional Analysis and Applications Vol.26 No.3
The main aim is to define a new class of generalized h-variational inequality problems and its generalized h-variational inequality problems. We define the class of h- -invex set, h- -invex function and H-pseudospace. Existence of the solution of the problems are established in H-pseudospace with the help of H-KKM mapping theorem and HC*-condition of associated with the function h.
Climate Change Projections over India by a Downscaling Approach Using PRECIS
Prasanta Kumar Bal,Andimuthu Ramachandran,Kandasamy Palanivelu,Perumal Thirumurugan,Rajadurai Geetha,Balakrishnan Bhaskaran 한국기상학회 2016 Asia-Pacific Journal of Atmospheric Sciences Vol.52 No.5
This study presents a comprehensive assessment of the possible regional climate change over India by using Providing REgional Climates for Impacts Studies (PRECIS), a regional climate model (RCM) developed by Met Office Hadley Centre in the United Kingdom. The lateral boundary data for the simulations were taken from a sub-set of six members sampled from the Hadley Centre’s 17- member Quantified Uncertainty in Model Projections (QUMP) perturbed physics ensemble. The model was run with 25 km × 25 km resolution from the global climate model (GCM) - HadCM3Q at the emission rate of special report on emission scenarios (SRES) A1B scenarios. Based on the model performance, six member ensembles running over a period of 1970-2100 in each experiment were utilized to predict possible range of variations in the future projections for the periods 2020s (2005-2035), 2050s (2035-2065) and 2080s (2065- 2095) with respect to the baseline period (1975-2005). The analyses concentrated on maximum temperature, minimum temperature and rainfall over the region. For the whole India, the projections of maximum temperature from all the six models showed an increase within the range 2.5oC to 4.4oC by end of the century with respect to the present day climate simulations. The annual rainfall projections from all the six models indicated a general increase in rainfall being within the range 15-24%. Mann-Kendall trend test was run on time series data of temperatures and rainfall for the whole India and the results from some of the ensemble members indicated significant increasing trends. Such high resolution climate change information may be useful for the researchers to study the future impacts of climate change in terms of extreme events like floods and droughts and formulate various adaptation strategies for the society to cope with future climate change.
Sugar-Hormone Cross-Talk in Anthocyanin Biosynthesis
Prasanta Kumar Das,박연일,신동호,최상봉 한국분자세포생물학회 2012 Molecules and cells Vol.34 No.6
Anthocyanins, a class of flavonoids, are recognized for their diverse functions in plant development and beneficial effects on human health. Many of the genes encoding anthocyanin biosynthesis enzymes and the transcription factors that activate or repress them have been identified. Regulatory proteins that control anthocyanin biosynthesis by regulating the expression of different structural genes at the transcriptional and post-transcriptional levels are differentially modulated by environmental and biological factors such as light, temperature, sugar and hormones. This minireview summarizes the recent findings contributing to our understanding of the role of sugars and hormones in the modulation of the anthocyanin biosynthesis pathway with emphasis on the coordinated regulation of the critical transcriptional R2R3-MYB/bHLH/WD40 (MBW) complex in Arabidopsis.
Prasanta Kumar Das 영남수학회 2017 East Asian mathematical journal Vol.33 No.1
The main purpose of this paper is to introduce a pair new class of primal and dual problem associated with an operator. We prove the sufficient optimality theorem, weak duality theorem and strong duality theorem for these problems. The equivalence between the generalized op- timization problems and the generalized variational inequality problems is studied in ordered topological vector space modeled in Hilbert spaces. We introduce the concept of partial differential associated (PDA)-operator, P DA- vector function and P DA-antisymmetric function to show the exis- tence of a new class of function called, (Tη;ξθ)-invex functions. We discuss first and second kind of (Tη;ξθ)-invex functions and establish their exis- tence theorems in ordered topological vector spaces.