361 research outputs found
An Imidazopyridinone and Further Metabolites from Streptomycetes
No full textScreening and chromatographic analysis of the extracts from the terrestrial streptomycete GW5127 and from the marine Streptomyces sp. isolate B7967 yielded four new metabolites, i.e. 8-ethyl-6,11-dihydroxy-1-methoxy-naphthacene-5,12-dione (1a), 4-acetyl-1,3-dihydro-imidazo[4,5-c]pyridin-2-one , (4a), 5-hydroxmethyl-4-hydroxy-2,4-dimethyl-2-cycloppentenone (6), and N-[2-(3'-hydroxy-4'-methoxyphenyl)-ethyl]-acetamide (5a), along with five known compounds, beta-rubromycin (2), gamma-rubromycin (3), 2-(3'-hydroxy-4'-methoxyphenyl)ethanol (5b), Uracil, and N-acetyltyramine. The structures Of the new compounds were deduced from high resolution mass, 1D and 2D NMR spectra and by comparison with related compounds from the literature. The antibiotic activity of the crude extracts was due to 2 and 3
An Imidazopyridinone and Further Metabolites from Streptomycetes
No full textScreening and chromatographic analysis of the extracts from the terrestrial streptomycete GW5127 and from the marine Streptomyces sp. isolate B7967 yielded four new metabolites, i.e. 8-ethyl-6,11-dihydroxy-1-methoxy-naphthacene-5,12-dione (1a), 4-acetyl-1,3-dihydro-imidazo[4,5-c]pyridin-2-one , (4a), 5-hydroxmethyl-4-hydroxy-2,4-dimethyl-2-cycloppentenone (6), and N-[2-(3'-hydroxy-4'-methoxyphenyl)-ethyl]-acetamide (5a), along with five known compounds, beta-rubromycin (2), gamma-rubromycin (3), 2-(3'-hydroxy-4'-methoxyphenyl)ethanol (5b), Uracil, and N-acetyltyramine. The structures Of the new compounds were deduced from high resolution mass, 1D and 2D NMR spectra and by comparison with related compounds from the literature. The antibiotic activity of the crude extracts was due to 2 and 3
Furanone Derivatives from Terrestrial Streptomyces spp.
No full textChemical investigation of the terrestrial Streptomyces sp. isolates GT2005/020 and ANK148 led to the isolation of two microbial furanone derivatives, 5-hydroxy-4-methylnaphtho[1,2-b]furan-3-one (1) and 4-hydroxy-5-methyl-furan-3-one (2), respectively, which have some similarity to quorum sensing molecules of the Al-2 type. In addition, the known compounds chalcomycin, ferulic acid, indole-3-acetic acid, uracil, thymine, 2'-deoxy-thymidin, monensin B (3), phencomycin, and l-acetyl-P-carboline were isolated. The structures of 1 and 2 were deduced from extensive studies of NMR (1D and 2D) and mass spectra. Additionally, the complete NMR shift assignments for monensin 13 (3) using H-H COSY, HMQC and HMBC experiments are reported here for the first time. We are describing the taxonomy and fermentation of the producing strains, the structure elucidation of the new metabolites and their bioactivity. [GRAPHICS] .Higher Education Commission of Pakistan (HEC
Queue Discharge at Freeway On-Ramps Using Coordinated Operation of a Ramp Meter and an Upstream Traffic Signal
No full textRamp metering is an effective way of maintaining optimum traffic conditions and mitigating congestion on freeways. Several strategies for ramp metering exist in the literature. They are typically based on the freeway traffic parameters as control inputs to the ramp control logic. The ramp signal can be controlled in two ways, i.e., locally controlled (isolated ramp control) and coordinated ramp control. Coordinated ramp control refers to the ramp metering strategies in which several ramp meters connected to the freeway segment are dynamically controlled by considering traffic flows along all ramps. Coordinated ramp metering can play a vital role in freeway congestion mitigation on the ramps as well as normalize the traffic flow over the freeway. In this study, an alternate coordinated metering scheme that uses the state of the upstream traffic signal on arterial as the control input to the ramp meter is proposed. The proposed method aims to prevent long queues on the ramp with limited storage by taking feedback from the upstream traffic signal on the arterial, especially when the ramp has a small storage area for vehicles. Simulation results show a significant reduction in the queue length over the ramp using the proposed scheme. Additionally, the proposed scheme also benefits the arterial traffic. 2020 The Authors. Published by Elsevier B.V.All rights reserved.Scopu
Enzyme activities and organic matter mineralization in response to application of gypsum, manure and rice straw in saline and sodic soils
No full textTrichoderma a Holistic Fungus with Biocontrol Potential for Agricultural Diseases
No full textAbstract Trichoderma is a genus, belonging to the division Ascomycota (Sordari omycetes, Hypocreales, Hypocreaceae) that have been popularly used as a biocon trol agent in agriculture because of their ability to interact and antagonize
phytopathogenic organisms such as bacteria, fungi, nematodes, and oomycetes.
Trichoderma can easily be isolated from natural soil, dead and decaying plant organic
matter, and wood and are classified as imperfect fungi. Production of antibiotics, competition for nutrients, and parasitism are considered as direct antagonistic mech anisms of Trichoderma during microbe-pathogen interactions. The production of
secondary metabolites as well as the secretion of hydrolytic cell wall degrading
enzymes also plays inevitable roles during microbial antagonism. The indirect mech anisms involve the interaction between Trichoderma with host plants. Working as a
plant growth promoter, inducing systemic resistance against biotic and abiotic stres sors, and enhancing the uptake of nutrients are other beneficial roles exhibited by
Trichoderma during plant–microbe interactions. The current chapter is intended to
discuss in detail on the mechanisms of Trichoderma-mediated management of plant
pathogenesis. The knowledge and understanding on the tripartite symbiotic inter action between Trichoderma with other beneficial plant microorganisms and host
plants would explore new avenues for improving sustainable agriculture.EEA CatamarcaFil: Al-Ani, L.K.T. Universiti Sains Malaysia. School of Biology Science; MalasiaFil: Mitrović, I. University of Novi Sad. Faculty of Technology Novi Sad. Department of Biotechnology and Pharmaceutical Engineering; SerbiaFil: Furtado, E.L. Universidade Estadual Paulista. Faculdade de Ciências Agronômicas de Boturcatu. Departamento de Proteção Vegetal; BrasilFil: Bhattacharyya, P.N. Nanda Nath Saikia College. Institutional Biotech Hub (IBT-HUB); IndiaFil: Hajji-Hedfi, L. Regional Centre of Agricultural Research of SidiBouzid; TúnezFil: Sukmawati, D. Universitas Negeri Jakarta. Faculty of Mathematics and Natural Sciences.Department of Biology; IndonesiaFil: Sukmawati, D. Universitas Negeri Jakarta. Faculty of Mathematics and Natural Sciences; IndonesiaFil: Aguilar-Marcelino, L. Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias (INIFAP). CENID-Salud Animal e Inocuidad; MéxicoFil: Phookamsak, R. Kunming Institute of Botany. Key Laboratory for Plant Diversity and Biogeography of East Asia; ChinaFil: Garganese, F. University of Bari Aldo Moro. Dipartimento Di Scienze del Suolo, Della Pianta E Degli Alimenti; ItaliaFil: Guimarães, R.A. Universidade Federal de Lavras.Departamento de Fitopatologia. Laboratório de Controle Biológico; BrasilFil: Roca, M.E.M. Universidad Nacional de La Rioja (UNLaR); ArgentinaFil: Carrasco, Franca Denise. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Catamarca; ArgentinaFil: Poitevin, C.G. Federal University of Paraná. Department of Basic Pathology. Laboratory of Microbiology and Molecular Biology; BrasilFil: Dautt-Castro, M. Centro de Investigación en Alimentación y Desarrollo. Laboratorio de Genética y Biología Molecular de Plantas; MéxicoFil: Acheampong, M.A. University of Ghana. Department of Crop Science; GhanaFil: Surono, S. Balai Penelitian Tanah; Indonesi
Immovable asset management in Tampin District Council / Muhammad Khaizuran Aqil Naharuddin
No full textNegeri Sembilan Darul Khusus is a state that has 7 district area that is Port Dickson, Jelebu, Seremban, Rembau, Kuala Pilah, Jempol dan Tampin. Tampin is a town, a district and a parliamentary constituency in Negeri Sembilan, Malaysia, however part of the town spills over into the neighbouring state of Malacca, as it is located along the Malacca-Negeri
Sembilan border. The district covers 129.49 square kilometres (50.00 sq mi) and is further divided into four adat socio-political provinces: Tampin town, Air Kuning, Gemencheh and Gemas.Tampin gets its name from the container or pouch weaved from the pandan fronds. The container was used to store condiments such as the kelamai or dodol and the shrimp paste belacan. The
district of Tampin is also called Luak Tampin as the word luak is the local term for district. Tampin was originally governed by the Rembau administration. After the Naning War in 1832, Raja Ali declared himself the ruler of Seri Menanti and his son-in-law, Syed Shaaban, as the ruler of
Rembau. This enraged other rulers of Negeri Sembilan as they had no right to the posts. In 1834 a civil war ensued, which resulted in Raja Ali and Syed Shaaban retreating to Tampin and the area from Mount Tampin to Putus Hill
being removed from Rembau. This area consisting of the provinces Repah, Keru, Tebong and Tampin Tengah formed the district known as Tampin
Shaaban Abdel Rahim and the changing stardom culture in Egypt
No full textThe subject of the study is Shaaban Abdel Rahim, an illiterate former makwagi (man
who irons clothes) who gained pan-Arab fame in 2001 for the song ‘I hate Israel’ and, despite fierce criticism from the national media, has become one of the most recognisable stars of sha’bi music in Egypt. The study aims to answer the question
of the main criterion of Abdel Rahim’s popularity. The initial hypothesis was that the political content of his songs was the most decisive factor in the matter. However, a
more detailed study, based on fieldwork conducted in Egypt in 2012, reveals that his
political commitment is not the key issue. Referring to the theory of social relevance
in popular culture, the author claims that Abdel Rahim’s success is not derived from
the meanings that people read into his songs, but rather from his low origins. The
phenomenon should be considered within the context of a highly class-based society
where Abdel Rahim has become a mouthpiece of the most neglected part of the
Egyptian population deprived of representation in the mainstream media
Supersymmetry, Supergravity, and Superstring Phenomenology
No full textSupersymmetry, supergravity, and superstring are amongst the most popular research topics in particle physics. Supersymmetry is a generalization of the space-time symmetries of quantum field theory that links the matter particles with the force-carrying particles and implies that there are additional superparticles necessary to complete the symmetry. Supergravity is the theory that combines the principles of supersymmetry and general relativity. It naturally includes gravity along with the other fundamental forces (the electromagnetic force, the weak nuclear force, in turn already unified in the electroweak interactions, and the strong nuclear force). String theory is the leading candidate for a theory that unifies all fundamental forces in nature in a consistent scheme. It also provides a consistent framework for the theory of quantum gravity. Compactified string/M-theories make testable predictions about our four-dimensional world.The phenomenology of supersymmetry, supergravity, and superstring is thus very rich and covers many topics: flavour physics and CP violation, Higgs and collider physics, model building beyond the Standard Model, and astroparticle physics and cosmology. Some recent developments in these theories, each with important applications to particle physics and/or cosmology, are the main theme of this special issue.One of the papers of this special issue discusses the constrained generalized Killing spinors, which characterize supersymmetric flux compactifications of supergravity theories, using geometric algebra techniques. Another paper presents a study on what are called Adinkras, which are combinatorial objects developed to study (1-dimensional) supersymmetry representations. Another paper reviews moduli stabilization in type IIB string theory compactification with fluxes. Another paper in this special issue describes supermultiplets wherein a continuously variable “tuning parameter” modifies the supersymmetry transformations. Another paper studies the constraints imposed on the Minimal Supersymmetric Standard Model (MSSM) parameter space by the Large Hadron Collider (LHC) Higgs mass measurements and gluino mass lower bound. Another paper studies helical phase inflation which realizes “monodromy inflation” in supergravity theory. Another paper considers scalar Wilson operators of Supersymmetric Yang-Mills (SYM) theories at high spin and generic twist operators in the multicolor limit. Another paper author gives an overview about the features that the Mathematica package SARAH provides to study new supersymmetric models. Another paper reviews a possible mechanism for the spontaneous breaking of supersymmetry, based on the presence of vacuum condensates. Another paper constructs and studies a formulation of a chargeless complex vector matter field in a supersymmetric framework
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