Linear rank-width of distance-hereditary graphs II. Vertex-minor obstructions

Kanté,, Mamadou Moustapha,Kwon, O-joung Academic Press 2018 European journal of combinatorics Vol.74 No.-

<P><B>Abstract</B></P> <P>In the companion paper (Adler et al., 2017), we presented a characterization of the linear rank-width of distance-hereditary graphs, from which we derived an algorithm to compute it in polynomial time. In this paper, we investigate structural properties of distance-hereditary graphs based on this characterization.</P> <P>First, we prove that for a fixed tree T , every distance-hereditary graph of sufficiently large linear rank-width contains a vertex-minor isomorphic to T . We extend this property to bigger graph classes, namely, classes of graphs whose prime induced subgraphs have bounded linear rank-width. Here, prime graphs are graphs containing no splits. We conjecture that for every tree T , every graph of sufficiently large linear rank-width contains a vertex-minor isomorphic to T . Our result implies that it is sufficient to prove this conjecture for prime graphs.</P> <P>For a class Φ of graphs closed under taking vertex-minors, a graph G is called a <I>vertex-minor obstruction</I> for Φ if G ∉ Φ but all of its proper vertex-minors are contained in Φ . Secondly, we provide, for each k ⩾ 2 , a set of distance-hereditary graphs that contains all distance-hereditary vertex-minor obstructions for graphs of linear rank-width at most k . Also, we give a simpler way to obtain the known vertex-minor obstructions for graphs of linear rank-width at most 1.</P>

An FPT Algorithm and a Polynomial Kernel for Linear Rankwidth-1 Vertex Deletion

Kanté,, M. M.,Kim, E. J.,Kwon, O. j.,Paul, C. Springer-Verlag 2017 Algorithmica Vol.79 No.1

Thermal degradation characteristic of Tetra Pak panel boards under inert atmosphere

Sabriye Piskin,Aysel Kantürk Figen,Evren Terzi,Nural Yilgör,Saip Nami Kartal 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.4

Thermal degradation characteristics of Tetra Pak panel boards (TPPB) can be useful to improve usage of such panels as an alternative to wood-based products such as plywood, fiberboard, and particleboard. In the study, samples from the TPBBs manufactured from waste Tetra Pak packages (WTPP) were heated in a nitrogen atmosphere at different heating rates (10, 15 and 20 oC/min) using a thermal analysis system. The Coats-Redfern kinetic model was applied to calculate kinetic parameters. The degradation rate equations were then established. In addition, the kinetic compensation effect (KCE) was used to correlate the pre-exponential factor (ko) with activation energy (Ea) and the existence of the KCE was accepted. TG-FT/IR analyses were applied to the TPPB degradation and then the FT-IR stack plot was used to analyze gas products (CO2, CH4, HCOOH, and CH3OH). Infrared vibrational frequencies and the micro,crystal structure of the TPPBs were investigated by Fourier transform infrared spectroscopy (FT-IR), Scanning electron microscope (SEM) and X-Ray diffraction analysis (XRD), respectively.

A taxonomic account of non-geniculate coralline algae (Corallinophycidae, Rhodophyta) from shallow reefs of the Abrolhos Bank, Brazil

Michel B. Jesionek,Ricardo G. Bahia,Jazmín J. Hernández-Kantún,Walter H. Adey,Yocie Yoneshigue-Valentin,Leila L. Longo,Gilberto M. Amado-Filho 한국조류학회I 2016 ALGAE Vol.31 No.4

The Abrolhos Continental Shelf (ACS) encompasses the largest and richest coral reefs in the southern Atlantic Ocean. A taxonomic study of non-geniculate coralline algae (NGCA) from the region was undertaken using both morpho-anatomicaland molecular data. Specimens of NGCA were collected in 2012 and 2014 from shallow reefs of the ACS. Phylogeneticanalysis was performed using dataset of psbA DNA sequences from 16 specimens collected in the ACS and additionalGenBank sequences of related NGCA species. Nine common tropical reef-building NGCA species were identifiedand described: Hydrolithon boergesenii, Lithophyllum kaiseri, Lithophyllum sp., Lithothamnion crispatum, Melyvonneaerubescens, Pneophyllum conicum, Porolithon onkodes, Sporolithon ptychoides, and Titanoderma prototypum. A key forspecies identification is also provided in this study. Our molecular phylogenetic analyses suggest that Lithophyllum sp. corresponds to a new species. Our study also confirms that Lithophyllum kaiseri is a new record in Brazil. The psbA sequencesof Lithophyllum kaiseri and Melyvonnea erubescens matched with type specimens indirectly. The taxonomicidentification of the remaining species was supported by morpho-anatomical evidences as DNA sequences of their typesor topotypes remain unavailable.

An overview of microdiesel — A sustainable future source of renewable energy

Bhatia, Shashi Kant,Bhatia, Ravi Kant,Yang, Yung-Hun Elsevier 2017 RENEWABLE & SUSTAINABLE ENERGY REVIEWS Vol.79 No.-

<P><B>Abstract</B></P> <P>Microdiesel obtained from microbes using renewable materials as carbon sources is an important alternative to petroleum diesel. This review provides information related to microdiesel production using various carbon sources; i.e. carbon dioxide, C<SUB>2</SUB>, saccharides, and lignocellulose. Microbes can accumulate different contents of fatty acids in the form of triacylglycerol (TAG). Not all microbes store fatty acids and utilize a broad range of substrates as carbon sources, and vice versa. Microbes can be engineered to consume various carbon sources, and accumulate increased amounts of fatty acids with different composition. The properties of microdiesel depend on its fatty acid profile, which in turn determines its efficacy. The structural features of the fatty acids, such as carbon chain length, branching and degree of unsaturation, affect the physiochemical properties of the biodiesel (cetane number (CN), oxidation stability (OS), iodine value (IV), cold flow properties, density and kinematic viscosity). Fatty acid methyl ester (FAME) profiles can be used to evaluate the key properties of biodiesel, i.e. the stability of the oil used. The overview presented herein concludes that microdiesel production using non-feed carbon sources and genetically engineered microbes shows much promise.</P>

Tree Biotechnology and Environmental Concerns

Kant, Tarun,Emmanuel, C.J.S.K. The Korean Society of Plant Biotechnology 2004 Plant molecular biology and biotechnology research Vol.6 No.1

Forestry sector has witnessed some unprecedented events in the recent past both in terms of galloping biotechnological developments and heated environmental debates over risks associated with release of transgenic trees. Improvements in the in vitro propagation techniques has made it possible to develop tissue culture based plant regeneration protocols just for about any tree species. And with the inclusion of every new species within the realms of tissue culture technology, it becomes a candidate for genetic improvement through recombinant DNA technology, the so called genetic engineering. Poplars and their hybrids serve as the model tree species on which most of the genetic transformation work as been carried out. A lot of work has also gone in genetic transformation of fruit trees and trees of horticultural interests. Trees have been successfully transformed for traits ranging from reduction of length of juvenile phase to alteration of tree architecture to altering wood quality by lignin and cellulose modification. More-over trees have been genetically engineered successfully to combat various types of insect pests and pathogens causing diseases. But all these developments have ignited controversies over the possible benefits and risks associated with transgenic plantations by various environmental agencies and activists. Solutions to most of these concerns can be found out with more intensive prioritized research.

Capatal Inflows and Capital Flight- Individual Countries Experience

Kant, Chander 세종대학교 국제경제연구소 1998 Journal of Economic Integration Vol.13 No.4

This paper examines whether individual countries' data show that FDI inflows facilitate capital flight and whether capital flight occurs due to poor domestic investment climate or is it due to discriminatory treatment against residents' investment. Three capital flight measures are used. Although the relationships have the expected signs, the absolute magnitude of the relationship among the countries differs widely. Also, the three measures of capital flight analyzed do not give consistent results. Thus, the definition and concept of capital flight that is actually used matters. (JEL Classifications: F23, F34, G15)

Structural, electrical and optical properties of MgO-reduced graphene oxide nanocomposite for optoelectronic applications

Kant Ravi,Sharma Tanmay,Bhardwaj Sumit,Kumar Kaushal 한국물리학회 2022 Current Applied Physics Vol.36 No.-

MgO-reduced graphene oxide nanocomposites (NCs) were synthesized by a simple two-step chemical method. The microstructure, surface morphology, and composition of the prepared samples have been studied. X-ray diffractometer (XRD) analysis confirmed the crystalline cubic MgO nanoparticle and rGO sheets. Scanning electron microscope (SEM) showed the spherical MgO nanoparticles well dispersed over the graphene sheets. UV–visible spectroscopy analysis demonstrated that a red shift in the wavelength dependent absorbance curve. The band gap of the samples was found to be decreased with the increase of rGO content. The dielectric studies have been examined in the frequency range 500 Hz− 5 MHz and found significant improvement in the dielectric constant, dielectric loss, and electric properties due to rGO addition. This is mainly attributed to the strong interfacial polarization (Maxwell–Wagner polarization) between MgO and rGO sheets. Further, the modulation of charge carrier density with rGO additions help to enhance the electrical conductivity of NCs and thus, encouraging to have wider application in electronic and energy technologies.

Prolyl 4 Hydroxylase: A Critical Target in the Pathophysiology of Diseases

Kant, Ravi,Bali, Anjana,Singh, Nirmal,Jaggi, Amteshwar Singh The Korean Society of Pharmacology 2013 The Korean Journal of Physiology & Pharmacology Vol.17 No.2

Prolyl 4 hydroxylases (P4H) are iron- and 2-oxoglutamate-dependent dioxygenase enzymes and hypoxia-inducible transcription factor (HIF)-P4Hs play a critical role in the regulating oxygen homeostasis in the local tissues as well in the systemic circulation. Over a period of time, a number of prolyl hydroxylase inhibitors and activators have been developed. By employing the pharmacological tools and transgenic knock out animals, the critical role of these enzymes has been established in the pathophysiology of number of diseases including myocardial infarction, congestive heart failure, stroke, neurodegeneration, inflammatory disease, respiratory diseases, retinopathy and others. The present review discusses the different aspects of these enzymes including their pathophysiological role in disease development.

MINORITY OWNERSHIP , DEFERRAL , PERVERSE INTRAFIRM TRADE AND TARIFFS

KANT, CHANDER 한국국제경제학회 1995 International Economic Journal Vol.9 No.1