scholarly journals Gene mining: A case study on putative iron-responsive cyanobacterial genetic locus using in silico bioinformatics, ecophysiology and expression-combined approach

2014 ◽  
Vol 43 (1) ◽  
pp. 79-86 ◽  
Author(s):  
NA El Semary
Keyword(s):  
Iron Transport ◽  
Genetic Locus ◽  
Iron Limitation ◽  
Iron Chelators ◽  
Combined Approach ◽  
Iron Starvation ◽  
Putative Gene ◽  
Gene Mining ◽  
Different Levels

Gene mining is an advanced approach used for annotating genetic loci and assigning them a putative function. In that regard, a Phormidium-like cyanobacterium was initially tested positive for its ability to produce iron-chelators. To mine for the putative genetic locus associated with these iron-chelators, a combined bioinformatics, ecophysiological, molecular and expression approach was applied. In order to test for the influence of iron limitation/starvation on the putative gene(s) involved, different levels of iron limitation/starvation were applied and the expression was quantified using real-time PCR. Mild iron limitation induced the expression of this iron-responsive locus at the beginning of iron stress but no detectable levels of expression were found as the stress continued. This possibly indicates the “switch off” of this putative genetic locus under conditions of extreme iron starvation. This locus is most likely involved in the synthesis of a membrane-associated protein that mediates iron transport or binding across membrane. DOI: http://dx.doi.org/10.3329/bjb.v43i1.19751 Bangladesh J. Bot. 43(1): 79-86, 2014 (June)

scholarly journals Digital Twin for Designing and Reconfiguring Human–Robot Collaborative Assembly Lines

2021 ◽  
Vol 11 (10) ◽  
pp. 4620
Author(s):  
Niki Kousi ◽  
Christos Gkournelos ◽  
Sotiris Aivaliotis ◽  
Konstantinos Lotsaris ◽  
Angelos Christos Bavelos ◽  
...  
Keyword(s):  
Production System ◽  
Assembly Lines ◽  
Flexible Assembly ◽  
Digital Twin ◽  
Collaborative Assembly ◽  
Geometrical Information ◽  
Line Level ◽  
Dual Arm ◽  
Different Levels

This paper discusses a digital twin-based approach for designing and redesigning flexible assembly systems. The digital twin allows modeling the parameters of the production system at different levels including assembly process, production station, and line level. The approach allows dynamically updating the digital twin in runtime, synthesizing data from multiple 2D–3D sensors in order to have up-to-date information about the actual production process. The model integrates both geometrical information and semantics. The model is used in combination with an artificial intelligence logic in order to derive alternative configurations of the production system. The overall approach is discussed with the help of a case study coming from the automotive industry. The case study introduces a production system integrating humans and autonomous mobile dual arm workers.

scholarly journals A Combined Approach for Model-Based PV Power Plant Failure Detection and Diagnostic

Energies ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1261
Author(s):  
Christopher Gradwohl ◽  
Vesna Dimitrievska ◽  
Federico Pittino ◽  
Wolfgang Muehleisen ◽  
András Montvay ◽  
...  
Keyword(s):  
Power Plants ◽  
Large Scale ◽  
Failure Detection ◽  
Energy Yield ◽  
Combined Approach ◽  
Levelized Cost Of Electricity ◽  
Term Operation ◽  
Model Based

Photovoltaic (PV) technology allows large-scale investments in a renewable power-generating system at a competitive levelized cost of electricity (LCOE) and with a low environmental impact. Large-scale PV installations operate in a highly competitive market environment where even small performance losses have a high impact on profit margins. Therefore, operation at maximum performance is the key for long-term profitability. This can be achieved by advanced performance monitoring and instant or gradual failure detection methodologies. We present in this paper a combined approach on model-based fault detection by means of physical and statistical models and failure diagnosis based on physics of failure. Both approaches contribute to optimized PV plant operation and maintenance based on typically available supervisory control and data acquisition (SCADA) data. The failure detection and diagnosis capabilities were demonstrated in a case study based on six years of SCADA data from a PV plant in Slovenia. In this case study, underperforming values of the inverters of the PV plant were reliably detected and possible root causes were identified. Our work has led us to conclude that the combined approach can contribute to an efficient and long-term operation of photovoltaic power plants with a maximum energy yield and can be applied to the monitoring of photovoltaic plants.

scholarly journals The Importance of Environmental Factors in the Planning of Container Terminals: The Case Study of the Port of Augusta

2021 ◽  
Vol 11 (5) ◽  
pp. 2153
Author(s):  
Nadia Giuffrida ◽  
Maja Stojaković ◽  
Elen Twrdy ◽  
Matteo Ignaccolo
Keyword(s):  
Environmental Impact ◽  
Container Terminal ◽  
Decision Support Tool ◽  
Container Terminals ◽  
Mitigation Measures ◽  
Support Tool ◽  
Clean Environment ◽  
Different Levels

Container terminals are the main hubs of the global supply chain but, conversely, they play an important role in energy consumption, environmental pollution and even climate change due to carbon emissions. Assessing the environmental impact of this type of port terminal and choosing appropriate mitigation measures is essential to pursue the goals related to a clean environment and ensuring a good quality of life of the inhabitants of port cities. In this paper the authors present a Terminal Decision Support Tool (TDST) for the development of a container terminal that considers both operation efficiency and environmental impacts. The TDST provides environmental impact mitigation measures based on different levels of evolution of the port’s container traffic. An application of the TDST is conducted on the Port of Augusta (Italy), a port that is planning infrastructural interventions in coming years in order to gain a new role as a reference point for container traffic in the Mediterranean.

unrechtliche peinliche schmehung oder dem gemeinen nutz nuetzlich?Eine Fallstudie zur Normenkonkurrenz im Schmähschriftprozess des 16. Jahrhunderts

2020 ◽  
Vol 25 (1) ◽  
pp. 135-149
Author(s):  
Jan Siegemund
Keyword(s):  
Early Modern ◽  
Common Good ◽  
Public Places ◽  
Legal Norms ◽  
The Public ◽  
The Common ◽  
The Public Sphere ◽  
The City ◽  
Different Levels

AbstractLibel played an important and extraordinary role in early modern conflict culture. The article discusses their functions and the way they were assessed in court. The case study illustrates argumentative spaces and different levels of normative references in libel trials in 16th century electoral Saxony. In 1569, Andreas Langener – in consequence of a long stagnating private conflict – posted several libels against the nobleman Tham Pflugk in different public places in the city of Dresden. Consequently, he was arrested and charged with ‘libelling’. Depending on the reference to conflicting social and legal norms, he had therefore been either threatened with corporal punishment including his execution, or rewarded with laudations. In this case, the act of libelling could be seen as slander, but also as a service to the community, which Langener had informed about potentially harmful transgression of norms. While the common good was the highest maxim, different and sometimes conflicting legally protected interests had to be discussed. The situational decision depended on whether the articulated charges where true and relevant for the public, on the invective language, and especially on the quality and size of the public sphere reached by the libel.

scholarly journals Natural resource abundance and eminent domain: A case study from Africa

2012 ◽  
Vol 27 (4) ◽  
pp. 319-325 ◽  
Author(s):  
Franklin Obeng-Odoom
Keyword(s):  
West Africa ◽  
Natural Resource ◽  
Analytical Framework ◽  
Eminent Domain ◽  
Resource Abundance ◽  
Local Impacts ◽  
Compulsory Purchase ◽  
Oil City ◽  
Different Levels

This Viewpoint article draws on the doctrine of eminent domain (or compulsory purchase) as an analytical framework to analyse the regional and local impacts of a new source of oil. Sekondi-Takoradi, an oil city located in Ghana, West Africa, is used as a case study to explore the differentiated experiences of local people. The article shows that, although there are complex distributional issues that require different levels of compensation and betterment to be assessed and paid for, it is unlikely that they will, in fact, even be considered.

Coping Mechanisms of Hospitality Industry Workers in a Tourism Destina-tion during the Covid-19 Pandemic

2021 ◽  
Vol 2 (12) ◽  
pp. 1410-1415
Author(s):  
Bezaleel Joy Murchante Danay ◽  
Zephaniah Dela Cruz Danay ◽  
Cherry Colesio Escarilla ◽  
Jimmy Bernabe Maming
Keyword(s):  
Hospitality Industry ◽  
Coping Mechanisms ◽  
Tourism Industry ◽  
Case Study Method ◽  
Key Informants ◽  
Travel And Tourism ◽  
Tourism Sector ◽  
Hospitality Workers ◽  
Different Levels

The Covid-19 pandemic brought massive devastations to the different levels of society. The World Travel and Tourism Council had recently warned that Covid-19 pandemic could lead to a cut of 50 million jobs worldwide in the travel and tourism industry. A study conducted by Oxford reveals that Asia will be vilest to be affected by the pandemic and it would take time to recover its economy (Dogra, 2020). This means a wider and greater impacts to the different industries including the tourism sector. The study aims to explore the coping mechanisms of hospitality industry workers in Boracay Island during the Covid-19 pandemic particularly on their experiences during the Covid-19 pandemic and to determine the coping mechanisms of hospitality workers in Boracay Island being affected by the pandemic. The case study method through a qualitative analysis using Robert Yin's approach in the data analysis procedure to explore the data from the experiences of the key informants from the hospitality industry was used. Themes came out from the construct of the key informants like (1) hospitality industry workers experienced mental health, social, and economic issues, (2) The pandemic opens new opportunities and ways to cope with its effects. The output of this research is the proposed Danay, Danay, Escarilla, and Maming Model for Coping Mechanisms of Hospitality Industry workers during the Covid-19 Pandemic.

scholarly journals Motivation and Autonomy in Learning English as Foreign Language: A Case Study of Ecuadorian College Students

2017 ◽  
Vol 10 (2) ◽  
pp. 100 ◽  
Author(s):  
Jorge Cevallos Bravo ◽  
Eder A. Intriago ◽  
Jhonny Villafuerte Holguin ◽  
Gustavo Molina Garzon ◽  
Luis Ortega Arcia
Keyword(s):  
College Students ◽  
Language Learning ◽  
Undergraduate Students ◽  
Quantitative Research ◽  
English Language ◽  
English As Foreign Language ◽  
Learning Attitudes ◽  
Correct Pronunciation ◽  
Different Levels

This quantitative research aims to examine how different levels of motivation relate to frequency of occurrence of autonomous language learning activities undertaken by undergraduate students. Eight hundred and sixty-two college students from 10 vocational training programs of a public university located in Ecuador, South America, participated in this study. Spratt’s questionnaire that regards ‘autonomy and motivation’ as a cyclical interaction in the language learning process, was updated by the researchers, adding digital education elements. The data were analyzed using the program SPSS v24.0.0 The results showed that there was a significant relationship between: the language learning stimulation generated by professors and the participants’ learning attitudes. In addition, it was determined that the most frequent language practices in which the participants showed greatest autonomy were: listening to songs in English language, worrying about the correct pronunciation, and noting down interesting words or expressions in English.

scholarly journals Genes Essential to Iron Transport in the Cyanobacterium Synechocystis sp. Strain PCC 6803

2001 ◽  
Vol 183 (9) ◽  
pp. 2779-2784 ◽  
Author(s):  
Hirokazu Katoh ◽  
Natsu Hagino ◽  
Arthur R. Grossman ◽  
Teruo Ogawa
Keyword(s):  
Iron Uptake ◽  
Iron Transport ◽  
Ferric Iron ◽  
Iron Acquisition ◽  
Complete Medium ◽  
Iron Starvation ◽  
Transporter Family ◽  
Genes Encoding ◽  
In Cells ◽  
Pcc 6803

ABSTRACT Genes encoding polypeptides of an ATP binding cassette (ABC)-type ferric iron transporter that plays a major role in iron acquisition inSynechocystis sp. strain PCC 6803 were identified. These genes are slr1295, slr0513, slr0327, and recently reportedsll1878 (Katoh et al., J. Bacteriol. 182:6523–6524, 2000) and were designated futA1, futA2, futB, andfutC, respectively, for their involvement in ferric iron uptake. Inactivation of these genes individually or futA1and futA2 together greatly reduced the activity of ferric iron uptake in cells grown in complete medium or iron-deprived medium. All the fut genes are expressed in cells grown in complete medium, and expression was enhanced by iron starvation. ThefutA1 and futA2 genes appear to encode periplasmic proteins that play a redundant role in iron binding. The deduced products of futB and futC genes contain nucleotide-binding motifs and belong to the ABC transporter family of inner-membrane-bound and membrane-associated proteins, respectively. These results and sequence similarities among the four genes suggest that the Fut system is related to the Sfu/Fbp family of iron transporters. Inactivation of slr1392, a homologue offeoB in Escherichia coli, greatly reduced the activity of ferrous iron transport. This system is induced by intracellular low iron concentrations that are achieved in cells exposed to iron-free medium or in the fut-less mutants grown in complete medium.

Sign in / Sign up

Export Citation Format

Share Document