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Number of results: 6
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Abstract

Coexisting microorganisms are abundant in nature. Plant growth promoting rhizobacteria (PGPR) is a group of beneficial microorganism living around the roots of plants which are able to confer beneficial effects on plant growth. Streptomyces sp. is a gram-positive bacteria as PGPR that can promote plant growth and enhance tolerance in adverse environment. This research was aimed to study the effects of plant growth promotion and stress tolerance of Streptomyces sp. in Arabidopsis and Brassica sp. The amount of indole-acetic acid (IAA) and phosphate solubility were assessed from isolated bacterial. Plant growth promotion was examined in 10-days old seedling with three independent experiments. Our results showed that Streptomyces sp. produced moderate levels of IAA and it was able to solubilize phosphate. Inoculation of Streptomyces sp. enhanced lateral root number, fresh weight and chlorophyll content in Arabidopsis thaliana. Moreover, the inoculation of Streptomyces sp. significantly increased vegetative growth on Arabidopsis and Brassica sp. by producing higher fresh weight and chlorophyll content. Streptomyces sp. also enhanced tolerance to abiotic stress in Arabidopsis and Brassica sp. by increasing fresh weight under condition of salt and heat stress. Under salt stress, inoculation of Streptomyces sp. in Arabidopsis induced activity of catalase enzyme and decreased hydrogen peroxide (H2O2) and malondialdehyde (MDA) production. In the molecular levels, Streptomyces sp. induced protein accumulations in Arabidopsis including nitrogen assimilation (GS1), carbohydrate metabolism (cFBPase), and the light-harvesting chlorophyll (Lhcb1) protein.

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Authors and Affiliations

Windy Manullang
Huey-wen Chuang
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Abstract

The goal of this paper is to discuss changes implemented in Danish early childhood education influenced by neoliberal ideology, and views concerning the new requirements for teachers (pedagogues) at private and self-owned kindergartens. The paper describes the historical tradition of Danish kindergartens based on children’s free play and democracy, allowing children to develop social skills and cognition through exploration and discovery, and giving practitioners a great deal of autonomy. The new trend in Danish early childhood education is towards detailed planning of work and accountability-based-assessment, which contradicts the traditional philosophy. It pushes teachers to create programs that develop children’s readiness for school and to implement teaching methods based on educational standards mandated by the government. The results of this research project, based on interviews conducted with teachers and educational experts, demonstrates the educators’ criticism of this new approach and their attempts to save democracy as a central value in education

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Authors and Affiliations

Katarzyna Gawlicz
ORCID: ORCID
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Abstract

The paper presents the mental files framework focusing on its seminal form invented by P.F. Strawson and on its contemporary parallel rendering by F. Recanati. It also outlines the main ideas that stood behind the introduction of the framework. These are in particular the problem of the informativeness of identity statements (for Strawson) and the controversy between singularism and descriptivism (for Recanati). The paper presents also a further enrichment of the framework, based upon some other themes from Strawson’s philosophy of language. The main ideas of the enrichment are: introducing into the structure of the files a section of the metadata, containing information about the files themselves as mental particulars, and adopting Strawson’s referring use as a triggering mechanism for opening/activating of the files.

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Authors and Affiliations

Mieszko Tałasiewicz
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Abstract

For non-sinusoidal single-phase systems, the classical apparent power has been divided into various components using different techniques. These power resolutions generally aim at to provide a tool for the accurate determination of the maximum power factor achievable with a passive compensator and to measure the load.s nonlinearity degree. This paper presents a current decomposition-based methodology that can be employed for computationally efficient implementation of the widely recognized non-sinusoidal power resolutions. The proposed measurement method and the original expressions of the power resolutions are comparatively evaluated by considering their computational complexity. The results show that the proposed method has a significant advantage in terms of computational efficiency for the simultaneous measurements of the powers when compared with the original expressions. Finally, in this paper, a PC-based power meter is developed using the proposed measurement method via the LabVIEW programme.

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Authors and Affiliations

Murat Erhan Balci
Mehmet Hakan Hocaoglu
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Abstract

Modern production technology requires new ways of surface examination and a special kind of surface profile parameters. Industrial quality inspection needs to be fast, reliable and inexpensive. In this paper it is shown how stochastic surface examination and its proper parameters could be a solution for many industrial problems not necessarily related with smoothing out a manufactured surface. Burnishing is a modern technology widely used in aircraft and automotive industries to the products as well as to process tools. It gives to the machined surface high smoothness, and good fatigue and wear resistance. Every burnished material behaves in a different manner. Process conditions strongly influence the final properties of any specific product. Optimum burnishing conditions should be preserved for any manufactured product. In this paper we deal with samples made of conventional tool steel – Sverker 21 (X153CrMoV12) and powder metallurgy (P/M) tool steel – Vanadis 6. Complete investigations of product properties are impossible to perform (because of constraints related to their cost, time, or lack of suitable equipment). Looking for a global, all-embracing quality indicator it was found that the correlation function and the frequency analysis of burnished surface give useful information for controlling the manufacturing process and evaluating the product quality. We propose three new indicators of burnishing surface quality. Their properties and usefulness are verified with the laboratory measurement of material samples made of the two mentioned kinds of tool steel.
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Authors and Affiliations

Daniel Toboła
Piotr Rusek
Kazimierz Czechowski
Tatiana Miller
Krzysztof Duda

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