Nikolaos Mittas

Prof. Nikolaos Mittas

orcid

Research Focus & Metrics

Academic Career Length

16Years (2011-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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21 May 2021 in Toxins
Verified
Journal Article
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Vasilios TsiourisVasilios Tsiouris
Vasilios Tsiouris
PTPanagiotis Tassis
Panagiotis Tassis
JRJog Raj
Jog Raj
TMTilemachos Mantzios
Tilemachos Mantzios
KKKonstantinos Kiskinis
Konstantinos Kiskinis
IGIoanna Georgopoulou
Ioanna Georgopoulou
The present study was designed to determine the efficacy of a novel multicomponent mycotoxin detoxifying agent (MMDA) containing modified zeolite (Clinoptilolite), Bacillus subtilis, B. licheniformis, Saccharomyces cerevisiae cell walls and silymarin against the deleterious effects of Aflatoxin B1 (AFB1) and Ochratoxin A (OTA) in broiler chicks. A total of 160 one-day-old Ross 308® broiler chicks were randomly allocated in four treatment groups, with four replicates, according to the following experimental design for 42 days. Group A received a basal diet; Group B received a basal diet contaminated with AFB1 and OTA at 0.1 mg/kg and 1 mg/kg, respectively; Group C received a basal diet contaminated with AFB1 and OTA and MMDA at 1 g/kg feed, and Group D received a basal diet contaminated with AFB1 and OTA and MMDA at 3 g/kg feed. Results showed that ingested mycotoxins led to significant (p ≤ 0.05) reduction in body weight and feed conversion from 25 days of age, induced histopathological changes, increased the pH of the intestinal content, and altered the biochemical profile of birds with significantly (p ≤ 0.05) increased aspartate aminotransferase (AST) values (p ≤ 0.05). On the other hand, the supplementation of MMDA significantly (p ≤ 0.05) improved the feed conversion ratio (FCR) during the second part of the study, diminished biochemical alterations, reduced pH in jejunal and ileal content, and E. coli counts in the caeca of birds (p ≤ 0.05). It may be concluded that the dietary supplementation of the MMDA partially ameliorated the adverse effects of AFB1 and OTA in broilers and could be an efficient tool in a mycotoxin control program.

26 August 2020 in Empirical Software Engineering
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Journal Article
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TATheodoros Amanatidis
Theodoros Amanatidis
NMNikolaos Mittas
Nikolaos Mittas
AMAthanasia Moschou
Athanasia Moschou
ACAlexander Chatzigeorgiou
Alexander Chatzigeorgiou
AAApostolos Ampatzoglou
Apostolos Ampatzoglou
LALefteris Angelis
Lefteris Angelis

19 November 2021 in IEEE Transactions on Software Engineering
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Journal Article
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DTDimitrios Tsoukalas
Dimitrios Tsoukalas
NMNikolaos Mittas
Nikolaos Mittas
ACAlexandros Chatzigeorgiou
Alexandros Chatzigeorgiou
Dionysios KehagiasDionysios Kehagias
Dionysios Kehagias
AAApostolos Ampatzoglou
Apostolos Ampatzoglou
LALefteris Angelis
Lefteris Angelis
Technical Debt (TD) is a successful metaphor in conveying the consequences of software inefficiencies and their elimination to both technical and non-technical stakeholders, primarily due to its monetary nature. The identification and quantification of TD rely heavily on the use of a small handful of sophisticated tools that check for violations of certain predefined rules, usually through static analysis. Different tools result in divergent TD estimates calling into question the reliability of findings derived by a single tool. To alleviate this issue we use 18 metrics pertaining to source code, repository activity, issue tracking, refactorings, duplication and commenting rates of each class as features for statistical and Machine Learning models, so as to classify them as High-TD or not. As a benchmark we exploit 18.857 classes obtained from 25 Java projects, whose high levels of TD has been confirmed by three leading tools. The findings indicate that it is feasible to identify TD issues with sufficient accuracy and reasonable effort: a subset of superior classifiers achieved an F2-measure score of approximately 0.79 with an associated Module Inspection ratio of approximately 0.10. Based on the results a tool prototype for automatically assessing the TD of Java projects has been implemented.

1 October 2021 in Journal of Systems and Software
Verified
Journal Article
Closed access
WWW. Eric Wong
W. Eric Wong
NMNikolaos Mittas
Nikolaos Mittas
EAElvira Maria Arvanitou
Elvira Maria Arvanitou
YLYihao Li
Yihao Li

1 August 2020 in Toxins
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Journal Article
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PTPanagiotis Tassis
Panagiotis Tassis
Ioannis A TsakmakidisIoannis A Tsakmakidis
Ioannis A Tsakmakidis
VNVeronika Nagl
Veronika Nagl
NRNicole Reisinger
Nicole Reisinger
ETEleni Tzika
Eleni Tzika
DSDian Schatzmayr
Dian Schatzmayr
Mycotoxins deoxynivalenol (DON) and zearalenone (ZEN) can negatively affect pig health. However, little is known about their effects on boar semen. We assessed the individual and combined effects of DON and ZEN on boar semen in vitro. In a pretrial, we determined the minimum dose (MiD) of each mycotoxin that induces a significant alteration of sperm progressive motility, as investigated using computer-assisted semen analysis (CASA). In the main trial, the individual and combined effects of each mycotoxin’s MiD on sperm motility and kinetics (CASA analysis), morphology (SpermBlue staining), viability (calcein-propidium iodide staining), membrane functional status (hypoosmotic swelling test), and chromatin integrity (acridine orange staining) were analyzed. Pretrial results suggested a MiD of 50.6 μM and 62.8 μM for DON and ZEN, respectively. In the main trial, DON and ZEN administered at MiD significantly affected CASA parameters (e.g., increase of immotile spermatozoa, reduction of progressive motile spermatozoa), decreased sperm viability, and affected sperm morphology (head abnormalities) and membrane functional status. DON and ZEN showed less than additive effects on most parameters tested and a synergistic effect on viability and on two CASA parameters. In conclusion, DON and ZEN showed individual and combined toxic effects on boar semen in vitro.

10 February 2022 in Cells
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Journal Article
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FCFani Chatzopoulou
Fani Chatzopoulou
KKKonstantinos A. Kyritsis
Konstantinos A. Kyritsis
CPChristos I. Papagiannopoulos
Christos I. Papagiannopoulos
Eleftheria GalatouEleftheria Galatou
Eleftheria Galatou
NMNikolaos Mittas
Nikolaos Mittas
Ioannis VizirianakisIoannis Vizirianakis
Ioannis Vizirianakis
MicroRNAs (miRNAs) create systems networks and gene-expression circuits through molecular signaling and cell interactions that contribute to health imbalance and the emergence of cardiovascular disorders (CVDs). Because the clinical phenotypes of CVD patients present a diversity in their pathophysiology and heterogeneity at the molecular level, it is essential to establish genomic signatures to delineate multifactorial correlations, and to unveil the variability seen in therapeutic intervention outcomes. The clinically validated miRNA biomarkers, along with the relevant SNPs identified, have to be suitably implemented in the clinical setting in order to enhance patient stratification capacity, to contribute to a better understanding of the underlying pathophysiological mechanisms, to guide the selection of innovative therapeutic schemes, and to identify innovative drugs and delivery systems. In this article, the miRNA–gene networks and the genomic signatures resulting from the SNPs will be analyzed as a method of highlighting specific gene-signaling circuits as sources of molecular knowledge which is relevant to CVDs. In concordance with this concept, and as a case study, the design of the clinical trial GESS (NCT03150680) is referenced. The latter is presented in a manner to provide a direction for the improvement of the implementation of pharmacogenomics and precision cardiovascular medicine trials.