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Nikolaos V. Stamatis

Nikolaos V. Stamatis
Hellenic Agricultural Organisation "Demeter", Fisheries Research Institute, Kavala, Greece · Marine Chemistry, Fish Processing

Dr. rer.nat.

About

46
Publications
11,281
Reads
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1,926
Citations
Additional affiliations
September 1995 - September 2013
Technological Educational Institute of Kavala
Position
  • Scientific Collaborator
Description
  • Lectures on organic chemistry, such as: special organic themes, organometallics, Polymer chemistry, Fuel and lubricant chemistry.
April 1994 - present
Fisheries Research Institute
Position
  • Head of Chem Lab
Description
  • We made research on: Fish preservation, packaging and quality control, High added and nutritional value products from sea organisms, Coastal environment upgrade causes, Monitoring of marine environment using chemical indicators.
Education
October 1984 - February 1993
Philipps University of Marburg
Field of study
  • Chemistry, Diplome and Dr. rer. nat.

Publications

Publications (46)
Research
Full-text available
Seminar details on the cource in Kalymnos island aiming processing methods of low demand fishery products (albacore, bogue ect.)
Conference Paper
Full-text available
Fishery of decapod crustaceans remain, globally, a process that provides societies with very important commercial food items, which are considered high nutritional resources, mainly due to their composition in protein and fatty acids. The aim of the present study is to investigate and compare the chemical composition of fatty acids and calorific en...
Article
Full-text available
Management of nutrient inputs and usage of nuisance biomass as feedstock for bioenergy may be the solution of coastal lagoons eutrophication. We studied the species composition, photosynthetic pigments (Chl-a and Chl-c) and performance (OJIP-kinetics and JIP-test parameters), biochemistry (lipids and carbohydrates composition), and hydrogen product...
Article
Full-text available
Pollution with copper (Cu), lead (Pb), zinc (Zn), chromium (Cr), and nickel (Ni) heavy metals of the surface sediments collected from three semi-closed East Mediterranean Gulfs, namely Kavala, Strymonikos, and Ierissos Gulfs, North Aegean Sea, Greece, was investigated to evaluate potential benthic ecological risks. The mean concentrations of the st...
Article
Full-text available
Aegean Sea albacore (T. alalunga), fresh or processed, is marketed locally in Greece or exported, mainly to Japan, Italy, Spain, and France. To provide information for consumers and biomonitoring programs and assess the potential human health risks, concentrations of mercury (Hg), cadmium (Cd) and lead (Pb) were determined in albacore edible muscle...
Article
This work demonstrates the tolerance of lichen Pleurosticta acetabulum under extreme conditions, similar to those encountered in extraterrestrial environments. Specifically, the impact of three extreme Mars-like conditions, complete dehydration, extremely low temperature (-196oC/77K) and oxygen depletion on lichens were investigated. The symbiosis...
Technical Report
Full-text available
This report provides data and analysis applying the available DCF data up to 2015. In 2015 the fish processing sector in the EU comprised approximately 3,600 enterprises with fish processing as main activity, 2% more than in 2008. The number of workers employed in the European fish processing industry in 2015 was 124,242, a decrease of 2% compared...
Article
Full-text available
Simultaneous nitrogen depletion and 3,4-dichlorophenol addition induce a bioenergetic microalgal reprogramming, through strong Cyt b6f synthesis, that quench excess electrons from dichlorophenol’s biodegradation to an overactivated photosynthetic electron flow and H2 -productivity. Cellular energy management includes “rational” planning and operat...
Article
Full-text available
60-70% των ψαρικών που καταναλώνονται είναι εισαγόμενα, με τάση συνέχισης της αύξησης των εισαγωγών, κάτι που θα μειώσει περαιτέρω τον βαθμό αυτάρκειας της ΕΕ. Η αυξημένη ζήτηση των αλιευμάτων σε παγκόσμιο επίπεδο εί-ναι αποτέλεσμα τόσο των διαφόρων εκστρατειών προώθησης (promotion campaigns) των προϊόντων, όσο και της "διαπαιδα-γώγησης" των κατανα...
Article
Full-text available
Biofuels are gaining importance as significant substitutes for the depleting fossil fuels. Recent focus is on microalgae as the third generation feedstock. In the present research work, two indigenous fresh water and two marine Chlorophyte strains have been cultivated successfully under laboratory conditions using commercial fertilizer (Nutrileaf 3...
Article
Full-text available
In this study, chemical composition and growth responses of chia plants (Salvia hispanica L.) to inoculation with an arbuscular mycorrhiza (AM, Glomus mosseae, Nicol. & Gerd.) fungal inoculum (namely MC10) under the influence of soil pH were investigated. The experiment project included six treatments, i.e., control-non-arbuscular mycorrhiza fungi...
Technical Report
Full-text available
The 2014 Economic Report on the European Union (EU) fish processing industry provides a comprehensive overview of the latest information available on the structure and economic performance of the sector. The report has been produced by fisheries economists from the JRC and a group of economic experts convened under the Scientific, Technical and Eco...
Article
Full-text available
This study investigates the distribution of heavy metals in the suspended particulate matter and the sediments of Kavala Gulf, located in Northern Greece. Particulate trace metals were determined in accordance to water column physicochemical parameters. Metals in sediments were related to the textural characteristics, the organic matter, and carbon...
Article
Full-text available
A total of 96 street dusts and 96 roadside soils have been sampled from three different localities (urban, industrial, peripheral) of the city of Kavala (Greece) and analyzed for Pb, Cu, Zn, Ni, Cr, Cd, As and Hg using the atomic absorption spectrophotometric method. Results showed that dust and soil samples from the urban and industrial area conta...
Article
Full-text available
Chemical, microbial and sensory quality indices of raw and marinated sea urchin Paracentrotus lividus Lamark, 1816, were determined. Marinades were prepared using three different formulations and stored over a 75-day period at 6 °C, under vacuum and air (control) packaging conditions. Significant differences were found between chemical (pH, moistur...
Article
Full-text available
Chemical, microbial and sensory quality aspects of the marinated ascidia Microcosmus sabatieri Roule, 1885, were examined over a 150-day period at 6 °C, under vacuum and air (control) packaging conditions using three different formulations (with 12% sodium chloride and 3%, 5% or 7% acetic acid). Significant differences were found between chemical a...
Article
Full-text available
1.The variation of structural (multi-dimensional scaling plot of Bray–Curtis similarity, species number, Shannon–Weaver index, percentage coverage) and functional (Ecological State Group (ESG) I percentage coverage, ESG II percentage coverage, Ecological Evaluation Index (EEI)) metrics in benthic macrophyte communities was studied in two different...
Article
Full-text available
The shelf life of fresh eel in various packaging conditions of atmospheric air, vacuum and modified atmosphere packaging (MAP) (40% CO(2), 30% N(2) and 30% O(2)) at 0 degrees C was investigated. All raw eel samples received acceptable sensory scores during the first 11+/-1 days of storage in atmospheric air, 11+/-1 days of storage in vacuum and fin...
Article
The effect of initial head-spaces of atmospheric air, vacuum and modified atmospheres packaging (50% CO2/50% N2) on microbiological, physicochemical and sensory changes of chub mackerel (Scomber colias japonicus) was studied at 3 and 6 °C. The microbial flora of chub mackerel comprised mainly lactic acid bacteria, Brochothrix thermosphacta (Gram-po...
Article
The self-life, quality and safety of refrigerated sardine fillets (Sardina pilchardus) were determined at 3 °C in atmospheric air, vacuum and modified atmosphere (50% CO2/50% N2) packaging conditions. Microbiological, physico-chemical and sensory parameters were utilised as quality indicators. The microbial flora of sardine comprised—according to o...
Article
Sediment and suspended particulate matter samples from 24 stations in the Gulf of Kavala have been examined for lead contamination. Grain size analysis and organic matter content were also performed. Total -- anthropogenic sediment lead concentrations and enrichment factors at stations close to harbors and chemical industries were found higher (up...
Article
The results of an intensive monitoring study of main eutrophication parameters in relation to fish farming management, climate and hydrography in the Vassova coastal lagoon (Nestos Delta) are pre- sented. The overall aim is to produce basic knowledge in order to contribute to the management of eutrophication of coastal lagoons at local and national...
Article
The economic and social indices for the year 2003 of the Greek seafood exploitation sector, composed of 157 small to medium-sized enterprises (SME's) is investigated in this paper. The economic state concerns the number of SME's, their activities and some fundamental financial indices, e.g. quantity and value of purchased raw material per species,...
Article
The results of a systematic and intensive nutrient monitoring program are reported, which took place during the period 1997–1999 in Kavala Gulf, Northern Greece, having as a general task to study the impact of the various human activities on the nutrient loadings and cycling of the aquatic environment. A nutrient budget box model was used to estima...
Article
The ecological evaluation index (EEI) was designed to estimate the ecological status of transitional and coastal waters. Marine benthic macrophytes (seaweeds, seagrasses) were used as bioindicators of ecosystem shifts due to anthropogenic stress, from the pristine state with late-successional species (high ecological status class (ESC)) to the degr...
Article
Surface sediment samples from Strymonikos and Ierissos Gulfs were analyzed for Cu, Pb, Zn, Cr and Ni. The results showed that the sediment of Ierissos Gulf is more polluted with Cu, Pb, and Zn as compared to that of Strymonikos Gulf. The benthal area located off the load-out facility of the mining operations in the town of Stratoni, in Ierissos Gul...
Article
A model to estimate the ecological status and identify restoration targets of transitional and coastal waters was developed. Marine benthic macrophytic species (seaweeds, seagrasses) were used to indicate shifts in the aquatic ecosystem from the pristine state with late-successional species (Ecological State Group I) to the degraded state with oppo...
Article
Dissolved nutrients, chlorophyll-α, salinity and temperature were measured at three inshore stations of Strymonikos Gulf in order to monitor the eutrophication process. Monthly samplings were carried out for the period from December 1997 to June 1999. High mean concentrations of dissolved inorganic nitrogen (144.3 μg 1-1), soluble reactive phosphor...
Article
The alteration of environmental conditions, under the influence of drainage canals and the intensification of agriculture in the recent years, seems to be responsible for the water quality variability at the lagoons Vassova and Eratino, Northern Greece. The stabilization and reclamation of the lagoonal ecosystem demands the improvement of the bioto...
Conference Paper
Full-text available
The altération of environmental conditions, under the influence of drainage canals and the intensification of agriculture the latest years, seems to be responsible for the qualitative change of fisheries at the lagoons Vassova and Eratino, Northern Greece. We hâve used a number of water quality parameters (température, salinity, nutrients) at selec...
Article
Deshielding of the tricoordinated C atom, a ring inversion barrier of approximately 8 kcal mol⁻¹ (Olah et al. determined a value of 8.4 kcal mol⁻¹ for the parent compound of 1), a shorter BB distance, and folding as in 1 and 2 (substituents here not defined) prove that 3 is homoaromatic. Very similar data were obtained for the parent compound C2B2H...
Article
Entschirmung des trikoordinierten C-Atoms, eine Ringinversionsbarriere von ca. 8 kcalmol⁻ (für die Stammverbindung von 1 hatten Olah et al. 8.4 kcalmol⁻¹ ermittelt), ein kurzer B-B-Abstand und eine Faltung wie in 1 und 2 (Substituenten hier nicht spezifiziert) belegen die Homoaromatizität von 3. Sehr ähnliche Daten wurden für die Stammverbindung C2...
Article
Carborane 1 and organoborane 2 are in equilibrium in solution. This is deduced from the temperature dependence of the position of the B-11 and C-13 NMR signals of 1 (R = tBu or mesityl). An estimation of the thermodynamic parameters shows that the energy difference between 1 and 2 (1 - 2 kcal mol-1) is significantly less than for the parent compoun...
Article
Stabilized by four beta-silyl groups through hyperconjugation, 1 is the first vinyl cation without pi-conjugation to be detected by NMR. The C-13 NMR spectrum of 1 at 130-degrees shows separate signals for the two silyl groups on the methine C atom. Ab initio MO calculations on model systems showed that hyper-conjugation controls this hindered rota...
Article
Stabilized by four β-silyl groups through hyperconjugation, 1 is the first vinyl cation without π conjugation to be detected by NMR. The 13C-NMR spectrum of 1 at -130o C shows separate signals for the two silyl groups on the methine C atom. Ab initio MO calculations on model systems showed that hyperconjugation controls this hindered rotation, resu...

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Projects

Projects (12)
Project
The aim is to develop a prognostic model, which will enable the end users (aquaculture farms) to determine the critical points at which interventions are necessary to prevent disease outbreaks in marine farmed fish. The model will be based on environmental data that include both biotic and abiotic factors. The study area from which these data will be collected is the “Sagiada strip” at the Northwestern part of Greece (Epirus Region), an area that contributes 12% of the total marine aquaculture production of Greece. The basic axes of the project are 1) the monitoring and recording of hydrological and environmental parameters of the study area, 2) the isolation and identification of disease causing agents (bacteria, parasites viruses) from infected fish, 3) the development and application of specialized molecular tools and protocols for the detection and quantification of the infectious agents in environmental samples and in particular in aquafarm waters 4) the correlation of the predominant environmental conditions with the presence of infectious agents and the outbreaks of diseases in fish for the development of the prognostic model. In the project, in addition to scientists from the Institutes of Fisheries Research and Veterinary Research of the Hellenic Agricultural Organization "DEMETER" (HAO-DEMETER) and from the Institute of Applied Biosciences of the Center of Research & Technology, Hellas (CERTH), also participate the mariculture companies Skaloma S.A., Lorida S.A., and Bastia S.A. The project is funded through a grant from the Operational Programme of Fisheries and Sea (Innovation in Aquaculture) 2014-2020.
Project
Melanosis or blackspot in shrimp is a harmless but objectionable discoloration or darkening and is caused by enzymes that are naturally present in the shrimp. These enzymes, in the presence of air, can chemically transform colorless compounds in the shrimp into complex brown pigments near the shrimp surfaces and shell. Melanosis is a color defect, and negatively affects quality perception and purchase by the customer because it is even though that we eat with our mouth but we buy with our eyes. This phenomenon has traditionally been prevented and controlled by the use of sodium sulfites, known as dip or powder. Sodium sulfides are in recommended doses harmless and only concern of small percentage of consumers they are allergic to sulfites. Sodium sulfides in overdoses (abuse or overuse of sulfites on shrimp by fishermen’s) and improperly temperature storage conditions can then produce hydrogen sulfide gas, which is very poisonous and presents a serious health risk. The aim of the present study is to develop alternative enzyme-based products that do not contain sulfites (when they contain only in recommended doses) to control melanosis on shrimp. Furthermore the project aims to investigate the use directions of the prepared new solutions or powders (especially solution concentration and soak time). They may need to be adjusted or increased to effectively control melanosis during storage and distribution in the Greek and foreign fisheries food market.
Project
Unprocessed anchovies are an extremely perishable fisheries product with a maximum self-life of four days, when stored in ice, before being rejected by consumers. The aim of this project is to extend its commercial self-life with the use of slurry ice enriched with micro/nano ozone bubbles. The project, among other things, will study the effect of the ozone micro/nano bubbles on the microbiome of anchovies, as well as on the autolytic and the bacterial-driven lytic processes. NGS technology (metabarcoding) will be applied to determining the effect of ozone on the anchovy microbiome, while 2D-DIGE analysis will be used to quantify changes in the anchovy muscle proteome with respect to storage conditions (slurry ice vs ozonated slurry ice) and time. This project is a collaboration between the Fisheries Research Institute and the Eastern Macedonia and Thrace Institute of Technology. The project is funded by the Operational Program “Fisheries and Sea, 2014-2020”.