691 results on '"Hiskia"'
Search Results
202. OPTIMASI SINTESIS BIOSURFAKTAN LAURIL AMIDA DARI ASAM LAURAT DAN DIETANOLAMINA MENGGUNAKAN PELARUT HEXANE DAN ENZIM LIPASE TERIMOBILISASI
- Author
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Hiskia Arapenta Ginting, Denny Samuel Silaen, Tjahjono Herawan, and Zuhrina Masyithah
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Solvent ,chemistry.chemical_compound ,Acid value ,Diethanolamine ,chemistry ,Amide ,Acetone ,Substrate (chemistry) ,Lauric acid ,Catalysis ,Nuclear chemistry - Abstract
Lauril amide is one of nonionic surfactant and has potency to become an ecofriendly surfactant. The main problem on lauril amide synthesis is the low conversion of lauric acid. Optimation of lauril amide synthesis is done with three variabels which give influence of amidation reaction. One stage amidation was done by reacting lauric acid with diethanolamine using catalyst Novozyme 435® with substrate ratio lauric acid:diethanolamine 1:1; 2:1; 3:1; 4:1; 5:1, amount of catalyst 1,8; 4; 7; 10; 11,8% from lauric acid total amount, solvent ratio 0; 1:1; 2:1; 3:1; 4:1 from lauric acid total amount and reacted for 24 hours with temperature reaction 55oC and 500 rpm. Product is separated from catalyst using filtration method and then purified by washing with acetone and heated at temperature of 90 oC to remove solvent. Product has been analyzed with acid value to obtained percent conversion of lauril amide, determine of Hydrophilic Liphophilic Balance value, spectroscopy Fourier Transform Infrared and determine of critical micelle concentrasion. Percent conversion optimum has obtained 86,16% at condition substrate ratio 1:1, enzyme concentration Novozyme 435® 7% and solvent ratio 2:1. Analysis result of lauril amide surfactant gave the hidrophile liphophile balance value about 11,93, it means that lauril amide surfactant can be used as emultion oil in water.
- Published
- 2017
203. OPTIMASI SINTESIS BIOSURFAKTAN KARBOHIDRAT ESTER DARI ASAM PALMITAT DAN FRUKTOSA MENGGUNAKAN ENZIM LIPASE TERIMOBILISASI
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Hiskia Arapenta Ginting, Denny Samuel Silaen, Zuhrina Masyithah, and Tjahjono Herawan
- Subjects
Palmitic acid ,Acid value ,chemistry.chemical_compound ,Hydrophilic-lipophilic balance ,Chromatography ,chemistry ,Pulmonary surfactant ,Substrate (chemistry) ,Fructose ,Carbohydrate ,Catalysis - Abstract
Carbohydrate ester is one of many needed nonionic surfactant groups and has the potential to be an environmental friendly surfactant. The principal problem in the synthesis of carbohydrate ester is to obtain the optimum conversion of palmitic acid from temperature influence, the amount of biocatalyst and reaction time. The optimization of carbohydrate ester synthesis is carried out on three variables that influence the esterification reaction. Therefore, the esterification process is carried out by reacting directly the palmitic acid and fructose using a Novozyme®435 an immobilized lipase enzyme catalyst with a free variable of reaction temperature of 41,5 oC, 45 oC, 50 oC, 55 oC, 58,4 oC, the amount of biocatalyst is 6,63%, 8%, 10%, 12%, 13,36% mass based palmitic acid also reaction time of 7,6 hours; 24 hours; 48 hours; 72 hours; 88,3 hours and reacted with fixed variable in 500 rpm; 3:1 substrate ratio (fructose:palmitic acid) and solvent amount 10 ml. The mixture is then separated from the catalyst by filtration. The product was analyzed with determination of acid number to obtain conversion percent of fructose ester, determination of Hydrophilic Lipophilic Balance, Fourier Transform Infrared (FTIR) an surface tension determination. The optimum conversion rate obtained is 61,80% at 55 oC of reaction temperature, Novozyme®435 enzyme count is 12% and 72 hours of reaction time. From the result of fructose ester surfactant analysis obtained HLB 10,592 value which showed fructose ester surfactant can be used as emulsifier of oil in water.
- Published
- 2017
204. Photocatalysis as an effective advanced oxidation process
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Ciara Byrne, Mallikarjuna N. Nadagouda, Ramalinga Viswanathan Mangalaraja, Dionysios D. Dionysiou, Miguel A. Gracia-Pinilla, Kevin E. O'Shea, Jacob Lalley, Changseok Han, Athanassios G. Kontos, Polycarpos Falaras, Anastasia Hiskia, Suresh C. Pillai, Theodoros M. Triantis, Christophoros Christophoridis, and Niall B. McGuinness
- Subjects
010302 applied physics ,Chemistry ,0103 physical sciences ,Advanced oxidation process ,Photocatalysis ,Nanotechnology ,02 engineering and technology ,021001 nanoscience & nanotechnology ,0210 nano-technology ,01 natural sciences - Published
- 2017
205. Purine 5′,8-cyclo-2′-deoxynucleoside lesions: formation by radical stress and repair in human breast epithelial cancer cells
- Author
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Chryssostomos Chatgilialoglu, Michael A. Terzidis, Dimitris Kletsas, Anastasia Hiskia, Kyriakos Papadopoulos, George Kordas, Sevasti-Kiriaki Zervou, Eleni K. Efthimiadou, and Marios G. Krokidis
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0301 basic medicine ,DNA damage ,DNA repair ,Breast Neoplasms ,medicine.disease_cause ,Biochemistry ,03 medical and health sciences ,chemistry.chemical_compound ,Free radicals ,breast cancer ,isotope dilution LC-MS/MS ,0302 clinical medicine ,Deoxyadenosine ,medicine ,Humans ,Mammary Glands, Human ,Deoxyadenosines ,Cancer ,Epithelial Cells ,General Medicine ,Base excision repair ,DNA repair protein XRCC4 ,medicine.disease ,Molecular biology ,Oxidative Stress ,030104 developmental biology ,chemistry ,030220 oncology & carcinogenesis ,MCF-7 Cells ,Female ,Reactive Oxygen Species ,Carcinogenesis ,DNA Damage ,Nucleotide excision repair - Abstract
5',8-Cyclo-2'-deoxyadenosine (cdA) and 5',8-cyclo-2'-deoxyguanosine (cdG) in their two diastereomeric forms, 5'S and 5'R, are tandem lesions produced by the attack of hydroxyl radicals to the purine moieties of DNA. Their formation has been found to challenge the cells' repair machinery, initiating the nucleotide excision repair (NER) for restoring the genome integrity. The involvement of oxidatively induced DNA damage in carcinogenesis and the reduced capacity of some cancer cell lines to repair oxidised DNA base lesions, intrigued us to investigate the implication of these lesions in breast cancer, the most frequently occurring cancer in women. Using liquid chromatography tandem mass spectrometry (LC-MS/MS), we measured the levels of diastereomeric cdA's and cdG's in estrogen receptor-alpha positive (ER-alpha) MCF-7 and triple negative MDA-MB-231 breast cancer cell lines before and after exposure to two different conditions: ionising radiations and hydrogen peroxide, followed by an interval period to allow DNA repair. An increase at the measured levels of all four lesions, i.e. 5'S-cdA, 5'R-cdA, 5'S-cdG and 5'R-cdG, was observed either after gamma-irradiation (5Gy dose) or hydrogen peroxide treatment (300muM) compared to the untreated cells (control), independently from the length of the interval period for repair. For comparison reasons, we also measured the levels of 8-oxo-2'-deoxyadenosine (8-oxo-dA), a well-known oxidatively induced DNA damage lesion and base excision repair (BER) substrate. The collected data indicate that MCF-7 and MDA-MB-231 breast cancer cells are highly susceptible to radiation-induced DNA damage, being mainly defective in the repair of these lesions.
- Published
- 2017
206. Structural and Morphological Analysis of Nanocomposite SnO2-Graphene Synthesized by Sol-Gel Method
- Author
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Hiskia, Aminuddin Debataraja, Brian Yuliarto, Bambang Sunendar, and Nugraha
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Nanocomposite ,Materials science ,Graphene ,Mechanical Engineering ,010401 analytical chemistry ,Nanotechnology ,02 engineering and technology ,Crystal structure ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,0104 chemical sciences ,law.invention ,Nanomaterials ,Tetragonal crystal system ,Chemical engineering ,Mechanics of Materials ,law ,Phase (matter) ,General Materials Science ,Nanorod ,0210 nano-technology ,Sol-gel - Abstract
Gas sensor performance is strongly influenced by the crystal structure, composition and morphology of the material used. In this paper, structural and morphological analysis of nanocomposite SnO2-Graphene synthesized by Sol-Gel method with the composition of 1:1, 1:2, 1:3 will be described. Analysis of the morphology and structure of nanocomposite SnO2-Graphene is investigated using XRD, SEM and TEM with the purpose of obtaining the crystal structure, morphology, composition and size of the resulting particles. The XRD results showed that the formation of the crystalline phase can be recorded at 2θ = 26.64; 34.2; 51.92, where the results of SEM show that the nanomaterial SnO2 has tetragonal structure while the graphene has hexagonal structure. The nanocomposite SnO2-Graphene has nanorod pattern. Furthermore, the surface analysis using TEM of nanocomposite SnO2-Graphene shows that the surface has the rod diameter in the range of 5-8 nm. The unique nanopattern of SnO2-Graphene will have potential applicability as the sensing material for CO gas sensor.
- Published
- 2017
207. Liquid Conductivity Sensor Based on AgPd Paste Fabricated on an Al2O3 Substrate Using Screen Printing Technique
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I Dewa Putu Hermida, Goib Wiranto, Beni Rama, Hiskia, and Dadi Rusdiana
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Materials science ,Fabrication ,business.industry ,Mechanical Engineering ,010401 analytical chemistry ,Analytical chemistry ,02 engineering and technology ,Substrate (printing) ,Square wave ,Conductivity ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,0104 chemical sciences ,Compensation (engineering) ,Mechanics of Materials ,Electrode ,Screen printing ,Optoelectronics ,General Materials Science ,0210 nano-technology ,business ,Sensitivity (electronics) - Abstract
In this paper, the design and fabrication of a liquid conductivity sensor based on AgPd paste will be described. The device was designed in a four-electrode configuration on a 10 x 25 mm2 96% Al2O3 substrate. The distance between the two driving electrodes was 4 mm, whereas the distance between the two measuring electrodes was 2 mm.The device was also integrated with a Ruthenium based temperature sensor printed on the backside of the substrate. Initial characterisation showed that the conductivity sensor has a measured sensitivity and cell constant of 1.67 cm and 0.51 cm-1, respectively, when a frequency of 1 kHz square wave input was appliedto the driving electrodes. Sensor’s respond variation against temperature was measured around 27.89 μS/°C, corresponding to 2.22 temperature compensation value for salt solution. The results showed a stable response over 5 days measurement cycle, indicating the sensor’s potential for field water quality monitoring application.
- Published
- 2017
208. Investigation of Nanostructured SnO 2 Synthesized with Polyol Technique for CO Gas Sensor Applications
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Brian Yuliarto, Bambang Sunendar, Aminuddin Debataraja, Daryl Widia Zulhendri, Nugraha, and Hiskia
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Materials science ,Scanning electron microscope ,Nanotechnology ,02 engineering and technology ,General Medicine ,Substrate (electronics) ,engineering.material ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Tin oxide ,01 natural sciences ,0104 chemical sciences ,Tetragonal crystal system ,Coating ,Chemical engineering ,Phase (matter) ,engineering ,Nanorod ,0210 nano-technology ,BET theory - Abstract
In the development of gas sensors, many material based on Metal Oxide Semiconductor is often used, one of them is Tin Oxide (SnO 2 ). SnO 2 is widely used for CO gas sensor because of several advantages including long life expectancy, relatively stable, high durability, resistance to corrosive gases, and good mechanical resistance. Performance improvement of CO gas sensor has been carried out by synthesizing SnO 2 by polyol technique to produce nanostructured powder followed by deposition on alumina substrate using doctor blade coating technique. In order to determine the performance of the sensor material, the sample was characterized using x-ray diffraction, scanning electron microscopy, and BETcalculation of N 2 adsorption-desorption. The XRD analysis showed the tetragonal crystal phase of SnO 2 , and BET analysis result in 24,53 m 2 /g surface area. Furthermore, SEM image showed the nanorod shape of SnO 2 morphology with diameter 50nm–2 μm. Sensor characterization with 30 ppm CO gas showed that the sample can work in 150 o C working temperature with sensitivity of 52.84%.
- Published
- 2017
209. Diversity, Cyanotoxin Production, and Bioactivities of Cyanobacteria Isolated from Freshwaters of Greece
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Triantafyllos Kaloudis, Manthos Panou, Sevasti-Kiriaki Zervou, Sofia Papadimitriou, Christophoros Christophoridis, Theodoros M. Triantis, Anastasia Hiskia, Antonia Kasampali, Stamatia Ioakeim, Despoina Konstantinou, Giorgia Maria Di Lorenzo, Dominiki Kati, Spyros Gkelis, Minas Arsenakis, and Panagiotis Apostolidis
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Cyanobacteria ,Nostoc ,Synechococcus ,Cell Survival ,Health, Toxicology and Mutagenesis ,Bacterial Toxins ,lcsh:Medicine ,Fresh Water ,Complex Mixtures ,Toxicology ,Jaaginema ,Article ,Cell Line ,Microbiology ,03 medical and health sciences ,RNA, Ribosomal, 16S ,Chlorocebus aethiops ,polyphasic taxonomy ,Microalgae ,Animals ,Humans ,Chroococcales ,Phylogeny ,030304 developmental biology ,Nostocales ,0303 health sciences ,Synechococcales ,Greece ,biology ,030302 biochemistry & molecular biology ,lcsh:R ,microcystins ,Biodiversity ,Cyanotoxin ,Ribosomal RNA ,biology.organism_classification ,Anti-Bacterial Agents ,antibacterial ,cytotoxicity ,Bacteria - Abstract
Cyanobacteria are a diverse group of photosynthetic Gram-negative bacteria that produce an array of secondary compounds with selective bioactivity against a broad spectrum of organisms and cell lines. In this study, 29 strains isolated from freshwaters in Greece were classified using a polyphasic approach and assigned to Chroococcales, Synechococcales, and Nostocales, representing 11 genera and 17 taxa. There were good agreements between 16S ribosomal RNA (rRNA)&ndash, cpcBA&ndash, internal genetic spacer (IGS) characterization and morphological features, except for the Jaaginema&ndash, Limnothrix group which appears intermixed and needs further elucidation. Methanol extracts of the strains were analyzed for cyanotoxin production and tested against pathogenic bacteria species and several cancer cell lines. We report for the first time a Nostoc oryzae strain isolated from rice fields capable of producing microcystins (MCs) and a Chlorogloeopsis fritschii strain isolated from the plankton of a lake, suggesting that this species may also occur in freshwater temperate habitats. Strains with very high or identical 16S rRNA gene sequences displayed different antibacterial and cytotoxic activities. Extracts from Synechococcus cf. nidulans showed the most potent antibacterial activity against Staphylococcus aureus, whereas Jaaginema sp. strains exhibited potent cytotoxic activities against human colorectal adenocarcinoma and hepatocellular carcinoma cells. Jaaginema Thessaloniki Aristotle University Microalgae and Cyanobacteria (TAU-MAC) 0110 and 0210 strains caused pronounced changes in the actin network and triggered the formation of numerous lipid droplets in hepatocellular carcinoma and green monkey kidney cells, suggesting oxidative stress and/or mitochondrial damage leading to apoptosis.
- Published
- 2019
210. The Development of Web Learning as Media to Deliver Web Programming Materials
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Hiskia Kamang Manggopa, Audy Aldrin Kenap, Johan Reimon Batmetan, Alfrina Mewengkang, and Christine Takarina Meitty Manoppo
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World Wide Web ,Web learning ,Development (topology) ,Computer science ,Web programming - Published
- 2019
211. Membrane lipidome reorganization and accumulation of tissue DNA lesions in tumor-bearing mice: an exploratory study
- Author
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Krokidis, M.G. Louka, M. Efthimiadou, E.K. Zervou, S.-K. Papadopoulos, K. Hiskia, A. Ferreri, C. Chatgilialoglu, C.
- Abstract
Increased rates of reactive oxygen/nitrogen species (ROS/RNS) are involved in almost all cancer types, associated with tumor development and progression, causing damage to biomolecules such as proteins, nucleic acids and membrane lipids, in different biological compartments. We used a human tumor xenograft mouse model to evaluate for the first time in parallel the remodeling of fatty acid moieties in erythrocyte membrane phospholipids and the level of ROS-induced DNA lesions in liver and kidney tissues. Using liquid chromatography tandem mass spectrometry the 5’R and 5’S diastereoisomers of 5’,8-cyclo-2’-deoxyadenosine and 5’,8-cyclo-2’-deoxyguanosine, together with 8-oxo-7,8-dihydro-2’-deoxyadenosine, were determined in mice at young (4- and 5-weeks) and old (17-weeks) ages and compared with control SCID mice without tumor implantation. Tumor-bearing mice showed a higher level of ROS-damaged nucleosides in genomic DNA as the age and tumor progress, compared to controls (1.07–1.53-fold in liver and 1.1–1.4-fold in kidney, respectively). The parallel fatty acid profile of erythrocyte membranes showed a profound lipid remodeling during tumor and age progression consisting of PUFA consumption and SFA enrichment (ca 28% and 58%, respectively, in late stage tumor-bearing mice), markers of enhanced oxidative and proliferative processes, respectively. Membrane lipid remodeling and ROS-induced DNA lesions may be combined to afford an integrated scenario of cancer progression and ageing, reinforcing a holistic vision among molecular markers rather than the biomarker identification in a single compartment. © 2019 by the authors. Licensee MDPI, Basel, Switzerland.
- Published
- 2019
212. Neurotoxin BMAA and its isomeric amino acids in cyanobacteria and cyanobacteria-based food supplements
- Author
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Manolidi, K. Triantis, T.M. Kaloudis, T. Hiskia, A.
- Abstract
Cyanobacteria are photosynthetic microorganisms distributed globally in aquatic and terrestrial environments. They are also industrially cultivated to be used as dietary supplements, as they have a high nutritional value; however, they are also known to produce a wide range of toxic secondary metabolites, called cyanotoxins. BMAA (β-methylamino-L-alanine) and its most common structural isomers, DAB (2,4-diaminobutyric acid) and AEG (N-2-aminoethylglycine) produced by cyanobacteria, are non-proteinogenic amino acids that have been associated with neurodegenerative diseases. A possible route of exposure to those amino acids is through consumption of food supplements based on cyanobacteria. The review critically discusses existing reports regarding the occurrence of BMAA, DAB and AEG in cyanobacteria and cyanobacteria-based food supplements. It is shown that inconsistencies in reported results could be attributed to performance of different methods of extraction and analysis applied and in ambiguities regarding determination of soluble and bound fractions of the compounds. The critical aspect of this review aims to grow awareness of human intake of neurotoxic amino acids, while results presented in literature concerning dietary supplements aim to promote further research, quality control as well as development of guidelines for cyanotoxins in food products. © 2018 Elsevier B.V.
- Published
- 2019
213. Organochlorine Pesticides and Triazines in the Drinking Water of Athens
- Author
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Tsipi, D. and Hiskia, A.
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- 1996
- Full Text
- View/download PDF
214. Multi-electron reduction of Wells-Dawson polyoxometalate films onto metallic, semiconducting and dielectric substrates
- Author
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Dimitris Tsikritzis, Ulrich Kortz, Charalampos Tselios, Ali Haider, Antonios M. Douvas, Ali S. Mougharbel, Stella Kennou, Anastasia Hiskia, Athanassios G. Coutsolelos, Leonidas C. Palilis, Panagiotis Argitis, and Maria Vasilopoulou
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chemistry.chemical_classification ,Thermal oxidation ,Materials science ,Inorganic chemistry ,General Physics and Astronomy ,02 engineering and technology ,Thermal treatment ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Metal ,chemistry.chemical_compound ,chemistry ,visual_art ,Polyoxometalate ,visual_art.visual_art_medium ,Work function ,Ammonium ,Physical and Theoretical Chemistry ,Counterion ,0210 nano-technology ,HOMO/LUMO - Abstract
The investigation of conditions allowing multi-electron reduction and reoxidation of polyoxometalate (POM) films onto solid substrates is considered an issue of critical importance for their successful incorporation in electronic devices, different types of sensors and catalytic systems. In the present paper, the rich multi-electron redox chemistry of films of Wells–Dawson ammonium salts, namely (NH4)6P2Mo18O62 and (NH4)6P2W18O62, on top of metallic (Al), semiconducting (ITO) and dielectric (SiO2) substrates under ambient conditions is investigated. The respective Keggin heteropolyacids, H3PMo12O40 and H3PW12O40, are also investigated for comparison. On Al substrates, the Wells–Dawson ammonium salts are found to be significantly more reduced (4–6e−) compared to the respective Keggin heteropolyacids (∼2e−), in accordance with their deeper lying lowest unoccupied molecular orbital (LUMO) level. Subsequent thermal treatment in air results in reoxidation of the initially highly reduced POM films. Similar behavior is found on ITO substrates, but in initially less reduced (2–4e−) Wells–Dawson POM films. On the other hand, on SiO2 substrates, the thermal reduction of (NH4)6P2Mo18O62 film is observed and attributed to the thermal oxidation of ammonium counterions by [P2Mo18O62]6− anions. Overall, the multi-electron reduction of Wells–Dawson ammonium salts onto metallic and semiconducting substrates (Al, ITO) is determined by the relative position of the LUMO level of POMs in relation to the Fermi level of the substrate (i.e. substrate work function) and affected in a synergistic way by the presence of ammonium counterions. In contrast, on dielectric substrates (SiO2) the reduction of Wells–Dawson POMs ((NH4)6P2Mo18O62) is attributed only to the oxidation of ammonium counterions.
- Published
- 2018
215. Leptothoe, a new genus of marine cyanobacteria (Synechococcales) and three new species associated with sponges from the Aegean Sea
- Author
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Despoina Konstantinou, Sevasti-Kiriaki Zervou, Eleni Voultsiadou, Anastasia Hiskia, Spyros Gkelis, and Emmanuel Panteris
- Subjects
0106 biological sciences ,Cyanobacteria ,Synechococcales ,biology ,010604 marine biology & hydrobiology ,Zoology ,Plant Science ,Aquatic Science ,biology.organism_classification ,010603 evolutionary biology ,01 natural sciences ,Sponge ,Phylogenetics ,Polyphyly ,RNA, Ribosomal, 16S ,Taxonomy (biology) ,Chondrilla nucula ,Symbiosis ,Petrosia ficiformis ,Phylogeny - Abstract
Cyanobacterial diversity associated with sponges remains underestimated, though it is of great scientific interest in order to understand the ecology and evolutionary history of the symbiotic relationships between the two groups. Of the filamentous cyanobacteria, the genus Leptolyngbya is the most frequently found in association with sponges as well as the largest and obviously polyphyletic group. In this study, five Leptolyngbya-like sponge-associated isolates were investigated using a combination of molecular, chemical, and morphological approach and revealed a novel marine genus herein designated Leptothoe gen. nov. In addition, three new species of Leptothoe, Le. sithoniana, Le. kymatousa, and Le. spongobia, are described based on a suite of distinct characters compared to other marine Leptolyngbyaceae species/strains. The three new species, hosted by four sponge species, showed different degrees of host specificity. Leptothoe sithoniana and Le. kymatousa hosted by the sponges Petrosia ficiformis and Chondrilla nucula, respectively, seem to be more specialized than Le. spongobia, which was hosted by the sponges Dysidea avara and Acanthella acuta. All three species contained nitrogen-fixing genes and may contribute to the nitrogen budget of sponges. Leptothoe spongobia TAU-MAC 1115 isolated from Acanthella acuta was shown to produce microcystin-RR indicating that microcystin production among marine cyanobacteria could be more widespread than previously determined.
- Published
- 2018
216. Occurrence of Pharmaceutical Residues in Sewage, River, Ground, and Drinking Water in Greece and Berlin (Germany)
- Author
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Heberer, Th., primary, Fuhrmann, B., additional, Schmidt-Baumler, K., additional, Tsipi, D., additional, Koutsouba, V., additional, and Hiskia, A., additional
- Published
- 2001
- Full Text
- View/download PDF
217. Photocatalytic processes by polyoxometalates. Splitting of water. The role of dioxygen
- Author
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Papaconstantinou, E., Ioannidis, A., Hiskia, A., Argitis, P., Dimotikali, D., and Korres, S.
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- 1993
- Full Text
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218. Selective photocatalytic reduction–recovery of palladium using polyoxometallates
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Troupis, A., Hiskia, A., and Papaconstantinou, E.
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- 2004
- Full Text
- View/download PDF
219. Photolytic and photocatalytic decomposition of fenitrothion by PW12O403− and TiO2: a comparative study
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Kormali, P, Dimoticali, D, Tsipi, D, Hiskia, A, and Papaconstantinou, E
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- 2004
- Full Text
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220. Assessment of the roles of reactive oxygen species in the UV and visible light photocatalytic degradation of cyanotoxins and water taste and odor compounds using C–TiO2
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Triantafyllos Kaloudis, Anastasia Hiskia, Theodora Fotiou, Kevin E. O'Shea, Theodoros M. Triantis, and Dionysios D. Dionysiou
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Environmental Engineering ,Light ,Microcystins ,Ultraviolet Rays ,Bacterial Toxins ,Naphthols ,02 engineering and technology ,010501 environmental sciences ,Cyanobacteria ,01 natural sciences ,Catalysis ,Water Purification ,chemistry.chemical_compound ,Alkaloids ,Organic chemistry ,Uracil ,Waste Management and Disposal ,0105 earth and related environmental sciences ,Water Science and Technology ,Civil and Structural Engineering ,Titanium ,chemistry.chemical_classification ,Reactive oxygen species ,Camphanes ,Photolysis ,Cyanobacteria Toxins ,Singlet oxygen ,Ecological Modeling ,Isopropyl alcohol ,Free Radical Scavengers ,021001 nanoscience & nanotechnology ,Pollution ,Geosmin ,chemistry ,Odor ,Taste ,Odorants ,Photocatalysis ,Marine Toxins ,Hydroxyl radical ,Cylindrospermopsin ,Reactive Oxygen Species ,0210 nano-technology ,Water Pollutants, Chemical - Abstract
Visible light (VIS) photocatalysis has large potential as a sustainable water treatment process, however the reaction pathways and degradation processes of organic pollutants are not yet clearly defined. The presence of cyanobacteria cause water quality problems since several genera can produce potent cyanotoxins, harmful to human health. In addition, cyanobacteria produce taste and odor compounds, which pose serious aesthetic problems in drinking water. Although photocatalytic degradation of cyanotoxins and taste and odor compounds have been reported under UV-A light in the presence of TiO2, limited studies have been reported on their degradation pathways by VIS photocatalysis of these problematic compounds. The main objectives of this work were to study the VIS photocatalytic degradation process, define the reactive oxygen species (ROS) involved and elucidate the reaction mechanisms. We report carbon doped TiO2 (C-TiO2) under VIS leads to the slow degradation of cyanotoxins, microcystin-LR (MC-LR) and cylindrospermopsin (CYN), while taste and odor compounds, geosmin and 2-methylisoborneol, were not appreciably degraded. Further studies were carried-out employing several specific radical scavengers (potassium bromide, isopropyl alcohol, sodium azide, superoxide dismutase and catalase) and probes (coumarin) to assess the role of different ROS (hydroxyl radical OH, singlet oxygen (1)O2, superoxide radical anion [Formula: see text] ) in the degradation processes. Reaction pathways of MC-LR and CYN were defined through identification and monitoring of intermediates using liquid chromatography tandem mass spectrometry (LC-MS/MS) for VIS in comparison with UV-A photocatalytic treatment. The effects of scavengers and probes on the degradation process under VIS, as well as the differences in product distributions under VIS and UV-A, suggested that the main species in VIS photocatalysis is [Formula: see text] , with OH and (1)O2 playing minor roles in the degradation.
- Published
- 2016
221. Photocatalytic oxidation of organic compounds by polyoxometalates of molybdenum and tungsten. Catalyst regeneration by dioxygen
- Author
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Hiskia, A. and Papaconstantinou, E.
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Photochemistry -- Analysis ,Oxo compounds -- Research ,Oxidation-reduction reaction -- Research ,Catalysts -- Research ,Chemistry - Abstract
Catalyst regeneration of molybdenum and tungsten polyoxometalates by dioxygen affects the reaction mechanism of photocatalysis. The reaction order and rate constants are dependent on different factors such as hydrogen ion concentration, temperature and degree of reduction. Reduced tungstates reoxidize faster than molybdates. No similarity with dioxygen is found out on a separate experiment with hydrogen peroxide.
- Published
- 1992
222. Photocatalytic reduction—recovery of silver using polyoxometalates
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Troupis, A., Hiskia, A., and Papaconstantinou, E.
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- 2003
- Full Text
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223. LEVELS OF ORGANOCHLORINE AND ORGANOPHOSPHORUS PESTICIDE RESIDUES IN GREEK HONEY
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Tsipi, D., primary, Hiskia, A., additional, and Triantafyllou, M., additional
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- 1996
- Full Text
- View/download PDF
224. Kinetic and mechanistic investigation of water taste and odor compound 2-isopropyl-3-methoxy pyrazine degradation using UV-A/Chlorine process
- Author
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Nikolaos Ioannidis, Triantafyllos Kaloudis, Theodoros M. Triantis, Anastasia Hiskia, and Maria Antonopoulou
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Environmental Engineering ,010504 meteorology & atmospheric sciences ,Pyrazine ,Radical ,Advanced oxidation process ,chemistry.chemical_element ,010501 environmental sciences ,01 natural sciences ,Pollution ,law.invention ,chemistry.chemical_compound ,chemistry ,Odor ,law ,Chlorine ,Environmental Chemistry ,Organic chemistry ,Degradation (geology) ,Electron paramagnetic resonance ,Waste Management and Disposal ,Isopropyl ,0105 earth and related environmental sciences - Abstract
The present study was launched as a continuation of global efforts to tackle problems associated with two important aesthetic characteristics, taste and odor (T&O), of drinking water. The UV-A/Chlorine process, a promising advanced oxidation process (AOP), was evaluated for the first time for the removal of 2-isopropyl-3-methoxy pyrazine (IPMP), a widely reported compound in the literature that causes unpleasant taste and odor when present in water at or below the ng L-1 level. It was found that the studied process was efficient for the removal of IPMP in both ultrapure and drinking water. The initial chlorine dosage influenced significantly the degradation efficiency under initial neutral pH values. Degradation efficiency of IPMP was slightly inhibited by using drinking water as matrix. Scavenging experiments highlighted the significant role of various reactive species (e.g. HO, ClO, Cl, Cl2-) generated during the process that have not been studied comprehensively until now. In addition, the significant role of HO was further verified by Electron paramagnetic resonance spectroscopy (EPR) experiments. Overall, the formation of diverse radicals during the UV-A/Chlorine treatment enhanced the degradation of IPMP, promoting mainly the formation of hydroxy, hydroperoxy and dealkylated derivatives. In contrast, chlorinated by-products were only identified in traces.
- Published
- 2020
225. New microginins from cyanobacteria of Greek freshwaters
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Sevasti-Kiriaki Zervou, Hanna Mazur-Marzec, Triantafyllos Kaloudis, Spyros Gkelis, and Anastasia Hiskia
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Cyanobacteria ,Nostoc ,Microcystis ,Environmental Engineering ,Health, Toxicology and Mutagenesis ,0208 environmental biotechnology ,02 engineering and technology ,010501 environmental sciences ,01 natural sciences ,chemistry.chemical_compound ,Metabolomics ,Tandem Mass Spectrometry ,Environmental Chemistry ,Microcystis aeruginosa ,0105 earth and related environmental sciences ,Microcystis viridis ,Greece ,biology ,Water Pollution ,Public Health, Environmental and Occupational Health ,General Medicine ,General Chemistry ,Decanoic acid ,biology.organism_classification ,Synechococcus ,Pollution ,020801 environmental engineering ,Lakes ,chemistry ,Biochemistry ,Peptides ,Water Microbiology ,Chromatography, Liquid ,Environmental Monitoring - Abstract
Cyanobacteria can form extensive blooms in water with concurrent production and release of a large number of chemically diverse and bioactive metabolites, including hazardous toxins. Significant number of the metabolites belongs to non-ribosomal peptides, with unique residues, unusual structures and great potential for biotechnological application. The biosynthetic pathways of the peptides generate tens of variants, but only part of them has been identified. Microginins are an understudied class of cyanobacterial linear peptides with a characteristic decanoic acid derivative amino acid residue in their structure. In this study, cyanobacterial blooms and isolated strains from Greek lakes were analyzed for the presence of microginins by liquid chromatography coupled to hybrid triple quadrupole/linear ion trap mass spectrometer (LC-qTRAP MS/MS). Microginin structures were elucidated based on the obtained fragmentation spectra. A large number of microginins occurred in blooms of Greek freshwaters and the most frequently detected were Microginin FR1 (70% of samples), Microginin T1 (52%), Microginin 565B (52%), Microginin T2 (43%), and Microginin 565A (43%). Additionally, nine cyanobacterial strains i.e. Nostoc oryzae, Synechococcus sp., Microcystis aeruginosa, Microcystis viridis, and five Microcystis sp., were found to produce microginins. Thirty-six new microginin structures were characterized out of fifty-one totally detected variants. This is the first time that such a diversity of microginins is reported to be present in water bodies. Results clearly demonstrate the great metabolomic potential of cyanobacteria that inhabit Greek freshwaters and significantly expand the knowledge of cyanobacterial secondary metabolites with regards to the class of microginins.
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- 2020
226. A knowledge based system for diagnosing heart diseases
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N S Bawiling, Hiskia Kamang Manggopa, Vivi Peggie Rantung, and C P C Munaiseche
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History ,Knowledge representation and reasoning ,Heart disease ,business.industry ,Computer science ,White-box testing ,Disease ,Machine learning ,computer.software_genre ,medicine.disease ,Knowledge acquisition ,Expert system ,Computer Science Applications ,Education ,Knowledge-based systems ,Forward chaining ,medicine ,Artificial intelligence ,business ,computer - Abstract
The purpose of this study was to design a knowledge based expert system for diagnosing heart diseases by using forward chaining as one of inference technique and analyse the software functionality through black box testing. The heart organ chosen because many mortality rates are caused by sudden heart attacks. The research method consists of seven stages: preliminary studies, data collection, knowledge acquisition, knowledge representation, knowledge implementation, system evaluation, and the last, drawing conclusions. The software application recognizes the type of heart disease after consultation by answering a few questions about the symptoms of disease that displayed by the system, and can infer the type of heart diseases suffered by the patient. Based on the results of black box testing, the expert system application has been running with good functionality. The knowledge based expert system is designed to provide solutions or initial actions that can be performed by patient in relation to heart disease he suffered (early detection).
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- 2019
227. Temperature Effects Explain Continental Scale Distribution of Cyanobacterial Toxins: Data descriptor
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Mantzouki, Evanthia, Lürling, Miquel, Fastner, Jutta, de Senerpont Domis, Lisette, Wilk-Woźniak, Elżbieta, Koreivienė, Judita, Seelen, Laura, Teurlincx, Sven, Verstijnen, Yvon, Krztoń, Wojciech, Walusiak, Edward, Karosienė, Jūratė, Kasperovičienė, Jūratė, Savadova, Ksenija, Vitonytė, Irma, Cillero-Castro, Carmen, Budzyńska, Agnieszka, Goldyn, Ryszard, Kozak, Anna, Rosińska, Joanna, Szeląg-Wasielewska, Elżbieta, Domek, Piotr, Jakubowska-Krepska, Natalia, Kwasizur, Kinga, Messyasz, Beata, Pełechaty, Aleksandra, Pełechaty, Mariusz, Kokocinski, Mikolaj, García-Murcia, Ana, Real, Monserrat, Romans, Elvira, Noguero-Ribes, Jordi, Duque, David Parreño, Fernández-Morán, Elísabeth, Karakaya, Nusret, Häggqvist, Kerstin, Demir, Nilsun, Beklioğlu, Meryem, Filiz, Nur, Levi, Eti E., Iskin, Uğur, Bezirci, Gizem, Tavşanoğlu, Ülkü Nihan, Özhan, Koray, Gkelis, Spyros, Panou, Manthos, Fakioglu, Özden, Avagianos, Christos, Kaloudis, Triantafyllos, Çelik, Kemal, Yilmaz, Mete, Marcé, Rafael, Catalán, Nuria, Bravo, Andrea G., Buck, Moritz, Colom-Montero, William, Mustonen, Kristiina, Pierson, Don, Yang, Yang, Raposeiro, Pedro M., Gonçalves, Vítor, Antoniou, Maria G., Tsiarta, Nikoletta, McCarthy, Valerie, Perello, Victor C., Feldmann, Tõnu, Laas, Alo, Panksep, Kristel, Tuvikene, Lea, Gagala, Ilona, Mankiewicz-Boczek, Joana, Yağcı, Meral Apaydın, Çınar, Şakir, Çapkın, Kadir, Yağcı, Abdulkadir, Cesur, Mehmet, Bilgin, Fuat, Bulut, Cafer, Uysal, Rahmi, Obertegger, Ulrike, Boscaini, Adriano, Flaim, Giovanna, Salmaso, Nico, Cerasino, Leonardo, Richardson, Jessica, Visser, Petra M, Verspagen, Jolanda M. H., Karan, Tünay, Soylu, Elif Neyran, Maraşlıoğlu, Faruk, Napiórkowska-Krzebietke, Agnieszka, Ochocka, Agnieszka, Pasztaleniec, Agnieszka, Antão-Geraldes, Ana M., Vasconcelos, Vitor, Morais, João, Vale, Micaela, Köker, Latife, Akçaalan, Reyhan, Albay, Meriç, Špoljarić Maronić, Dubravka, Stević, Filip, Žuna Pfeiffer, Tanja, Fonvielle, Jeremy, Straile, Dietmar, Rothhaupt, Karl-Otto, Hansson, Lars-Anders, Urrutia-Cordero, Pablo, Bláha, Luděk, Geriš, Rodan, Fránková, Markéta, Koçer, Mehmet Ali Turan, Alp, Mehmet Tahir, Remec-Rekar, Spela, Elersek, Tina, Triantis, Theodoros, Zervou, Sevasti-Kiriaki, Hiskia, Anastasia, Haande, Sigrid, Skjelbred, Birger, Madrecka, Beata, Nemova, Hana, Drastichova, Iveta, Chomova, Lucia, Edwards, Christine, Sevindik, Tuğba Ongun, Tunca, Hatice, Önem, Burçin, Aleksovski, Boris, Krstić, Svetislav, Vucelić, Itana Bokan, Nawrocka, Lidia, Salmi, Pauliina, Machado-Vieira, Danielle, de Oliveira, Alinne Gurjão, Delgado-Martín, Jordi, García-García, David, Cereijo, Jose Luís, Gomà, Joan, Trapote, Mari Carmen, Vegas-Vilarrúbia, Teresa, Obrador, Biel, Grabowska, Magdalena, Karpowicz, Maciej, Chmura, Damian, Úbeda, Bárbara, Gálvez, José Ángel, Özen, Arda, Christoffersen, Kirsten Seestern, Warming, Trine Perlt, Kobos, Justyna, Mazur-Marzec, Hanna, Pérez-Martínez, Carmen, Ramos-Rodríguez, Eloísa, Arvola, Lauri, Alcaraz-Párraga, Pablo, Toporowska, Magdalena, Pawlik-Skowronska, Barbara, Niedźwiecki, Michał, Pęczuła, Wojciech, Leira, Manel, Hernández, Armand, Moreno-Ostos, Enrique, Blanco, José María, Rodríguez, Valeriano, Montes-Pérez, Jorge Juan, Palomino, Roberto L., Rodríguez-Pérez, Estela, Carballeira, Rafael, Camacho, Antonio, Picazo, Antonio, Rochera, Carlos, Santamans, Anna C., Ferriol, Carmen, Romo, Susana, Soria, Juan Miguel, Dunalska, Julita, Sieńska, Justyna, Szymański, Daniel, Kruk, Marek, Kostrzewska-Szlakowska, Iwona, Jasser, Iwona, Žutinić, Petar, Gligora Udovič, Marija, Plenković-Moraj, Anđelka, Frąk, Magdalena, Bańkowska-Sobczak, Agnieszka, Wasilewicz, Michał, Özkan, Korhan, Maliaka, Valentini, Kangro, Kersti, Grossart, Hans-Peter, Paerl, Hans W., Carey, Cayelan C., Ibelings, Bas W., Aquatic Ecology (AqE), and AKWA
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international ,Journal Article - Abstract
situ Insight into how environmental change determines the production and distribution of cyanobacterial toxins is necessary for risk assessment. Management guidelines currently focus on hepatotoxins (microcystins). Increasing attention is given to other classes, such as neurotoxins (e.g., anatoxin-a) and cytotoxins (e.g., cylindrospermopsin) due to their potency. Most studies examine the relationship between individual toxin variants and environmental factors, such as nutrients, temperature and light. In summer 2015, we collected samples across Europe to investigate the effect of nutrient and temperature gradients on the variability of toxin production at a continental scale. Direct and indirect effects of temperature were the main drivers of the spatial distribution in the toxins produced by the cyanobacterial community, the toxin concentrations and toxin quota. Generalized linear models showed that a Toxin Diversity Index (TDI) increased with latitude, while it decreased with water stability. Increases in TDI were explained through a significant increase in toxin variants such as MC-YR, anatoxin and cylindrospermopsin, accompanied by a decreasing presence of MC-LR. While global warming continues, the direct and indirect effects of increased lake temperatures will drive changes in the distribution of cyanobacterial toxins in Europe, potentially promoting selection of a few highly toxic species or strains.
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- 2018
228. Using Laboratory Monitoring Application to Improve Learning Outcomes of Digital Systems of PTIK Unima Engineering Faculty Students
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Hiskia Kamang Manggopa, Morris Serulo Silva Sammie Tumanduk, Jim Ronny Tuna, Alfrina Mewengkang, and Christine Takarina Meitty Manoppo
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Class (computer programming) ,education.field_of_study ,Medical education ,Laboratory monitoring ,Population ,Sample (statistics) ,Student learning ,Action research ,education ,Psychology ,Research data ,Research method - Abstract
This study aims to improve learning outcomes of the Digital System of PTIK students in the second semester of the 2016/2017 school year through the use of the Netop School laboratory application. The research method used is Classroom Action Research (CAR). Population and sample are all second semester students of the PTIK Department of the Faculty of Engineering Unima who contact the Digital System subject in the 2016/2017 school year. The research data was taken from the value of student learning outcomes in cycle I and cycle II with digital circuit material. Student learning outcomes in the initial conditions which only reached 59% increased to 75% in cycle 1. Likewise the grade completeness grade has increased from 76% to 80% in cycle 1. While in cycle 2 it becomes 100% or the whole student has reached the value individual completion amounted to 75. Class completion value also increased from 80% to 87% in Cycle 2. From the results of this study it can be concluded that using labora tory monitoring applications can improve learning outcomes of Digital System courses. Laboratory monitoring application Netop school can support and facilitate learning to be more enjoyable and more efficient, students' activities during the laboratory can be controlled and more active in learning. So the use of the latest technologyl advancements can maximize laboratory functions to improve learning outcomes.
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- 2018
229. A European Multi Lake Survey dataset of environmental variables, phytoplankton pigments and cyanotoxins
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Moritz Buck, David García, Nur Filiz, Luděk Bláha, Teresa Vegas-Vilarrúbia, Manel Leira, David Parreño Duque, Donald C. Pierson, Pablo Alcaraz-Párraga, Justyna Kobos, Bárbara Úbeda, Triantafyllos Kaloudis, Elif Neyran Soylu, Eloísa Ramos-Rodríguez, Kerstin Häggqvist, Aleksandra Pełechata, Elżbieta Szeląg-Wasielewska, Meral Apaydın Yağcı, Anna Kozak, Edward Walusiak, Meryem Beklioglu, Monserrat Real, Nusret Karakaya, Carlos Rochera, Iwona Jasser, Kristiina Mustonen, José María Blanco, Delphine Latour, Nilsun Demir, Evanthia Mantzouki, Jutta Fastner, Carmen Cillero-Castro, Danielle Machado-Vieira, Tunay Karan, Jeremy Fonvielle, Kemal Celik, Mehmet Ali Turan Koçer, Miquel Lürling, Rafael Marcé, Dietmar Straile, Valerie McCarthy, Petar Žutinić, Korhan Özkan, Özden Fakioglu, Fuat Bilgin, Maria G. Antoniou, Sarah O'Leary, Itana Bokan Vucelić, Kersti Kangro, Trine Perlt Warming, Hatice Tunca, Kirsten Christoffersen, Lidia Nawrocka, Estela Rodríguez-Pérez, Abdulkadir Yağcı, Justyna Sieńska, Jessica Richardson, Elísabeth Fernández-Morán, Beata Madrecka, Barbara Pawlik-Skowrońska, Hans-Peter Grossart, Petra M. Visser, Leonardo Cerasino, Joanna Rosińska, Ülkü Nihan Tavşanoğlu, Elvira Romans, Boris Aleksovski, Agnieszka Bańkowska-Sobczak, Pauliina Salmi, Latife Köker, Cayelan C. Carey, Magdalena Toporowska, Lauri Arvola, Antonio Picazo, Elisabeth J. Faassen, Cafer Bulut, Joana Mankiewicz-Boczek, William Colom-Montero, Gregory Giuliani, Markéta Fránková, Ulrike Obertegger, Spela Remec-Rekar, Rahmi Uysal, Tanja Žuna Pfeiffer, Sigrid Haande, Jose Luis Cereijo, Victoria Bergkemper, Eilish Beirne, Agnieszka Ochocka, Uğur Işkın, Meriç Albay, Karl-Otto Rothhaupt, Nico Salmaso, Lea Tuvikene, Roberto L. Palomino, Bastiaan Willem Ibelings, Gizem Bezirci, Carmen Pérez-Martínez, Tuğba Ongun Sevindik, Dubravka Špoljarić Maronić, Ana Maria Antão-Geraldes, Jūratė Kasperovičienė, Christos Avagianos, João Morais, Daniel Szymański, Vítor Gonçalves, Susana Romo, Jorge Juan Montes-Pérez, Kristel Panksep, J. A. Gálvez, James B. Campbell, Biel Obrador, Mehmet Cesur, Irma Vitonytė, Andrea Törökné, Hannah Cromie, Tõnu Feldmann, Eti E. Levi, Ryszard Gołdyn, Mikołaj Kokociński, Lisette N. de Senerpont Domis, Kinga Kwasizur, Burçin Önem, Michał Wasilewicz, Magdalena Grabowska, Iwona Kostrzewska-Szlakowska, Mete Yilmaz, Reyhan Akçaalan, Koray Ozhan, Jordi Noguero-Ribes, Antonio Camacho, Giovanna Flaim, Nikoletta Tsiarta, Joan Gomà, Jūratė Karosienė, Elżbieta Wilk-Woźniak, Wojciech Pęczuła, Maciej Karpowicz, Michał Niedźwiecki, Vitor Vasconcelos, Spyros Gkelis, Agnieszka Napiórkowska-Krzebietke, Laura Seelen, Juan M. Soria, Iosif Konstantinou, Kadir Çapkın, Birger Skjelbred, Agnieszka Pasztaleniec, Núria Catalán, Şakir Çinar, Anđelka Plenković-Moraj, Lucia Chomova, Mehmet Tahir Alp, Magdalena Frąk, Theodoros M. Triantis, Adriano Boscaini, Carmen Ferriol, Judita Koreivienė, Julita Dunalska, Andrea G. Bravo, Hana Nemova, Ilona Gagala, Ana García-Murcia, Mariusz Pełechaty, Enrique Moreno-Ostos, Yvon Verstijnen, Lars-Anders Hansson, Ksenija Savadova, Jolanda M. H. Verspagen, Svetislav Krstić, Anastasia Hiskia, Valeriano Rodríguez, Wojciech Krztoń, Filip Stević, Hanna Mazur-Marzec, Agnieszka Budzyńska, Faruk Maraşlıoğlu, R. Carballeira, Alo Laas, Valentini Maliaka, Micaela Vale, Piotr Domek, Jordi Delgado-Martín, Marija Gligora Udovič, Manthos Panou, Iveta Drastichova, Tina Elersek, Sven Teurlincx, Damian Chmura, Beata Messyasz, Arda Özen, Pedro M. Raposeiro, E. Emiel van Loon, Natalia Jakubowska-Krepska, Armand Hernández, Anna C. Santamans, Christine Edwards, Yang Yang, Pablo Urrutia-Cordero, Rodan Geriš, Victor C. Perello, Sevasti-Kiriaki Zervou, Hans W. Paerl, Alinne Gurjão de Oliveira, Mari Carmen Trapote, Marek Kruk, Tokat Gaziosmanpaşa Üniversitesi, Theoretical and Computational Ecology (IBED, FNWI), Freshwater and Marine Ecology (IBED, FNWI), Havran Meslek Yüksekokulu, CIIMAR - Centro Interdisciplinar de Investigação Marinha e Ambiental, Antoniou, Maria-Paraskevi, Giuliani, Gregory, Ibelings, Bastiaan Willem, European Cooperation in Science and Technology, Hernández, Armand, School of Biology, Aristotle University of Thessaloniki, Masaryk University [Brno] (MUNI), Lammi Biological Station (LBS), University of Helsinki, German Federal Environmental Agency / Umweltbundesamt (UBA), Limnological Institute, University of Konstanz, Fdn Edmund Mach, IASMA Research and Innovation Centre, Department of Biology, Faculty of Sciences, Instituto de Engenharia de Sistemas e Computadores Investigação e Desenvolvimento em Lisboa (INESC-ID), Instituto Superior Técnico, Universidade Técnica de Lisboa (IST)-Instituto de Engenharia de Sistemas e Computadores (INESC), University of Strathclyde [Glasgow], Instituto Catalán de Investigación del Agua - ICRA (SPAIN) (ICRA), Mälardalen University (MDH), Freiburg Institute for Advanced Studies-LifeNet, Albert-Ludwigs-Universität Freiburg, Department of Computer Science and Engineering [San Diego] (CSE-UCSD), University of California [San Diego] (UC San Diego), University of California-University of California, Department of Environmental Sciences [Wageningen], Wageningen University and Research [Wageningen] (WUR), Environmental Sciences, Laboratoire Microorganismes : Génome et Environnement (LMGE), Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS), Universitat de Barcelona, Fen Edebiyat Fakültesi, BAİBÜ, Mühendislik Fakültesi, Çevre Mühendisliği Bölümü, Karakaya, Nusret, Hernández, Armand [0000-0001-7245-9863], Hitit Üniversitesi, Fen Edebiyat Fakültesi, Biyoloji Bölümü, AKWA, Aquatic Ecology (AqE), Helsingin yliopisto = Helsingfors universitet = University of Helsinki, Department of Computer Science and Engineering [Univ California San Diego] (CSE - UC San Diego), and University of California (UC)-University of California (UC)
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Ecologia dels llacs ,Data Descriptor ,Water resources ,Aquatic Ecology and Water Quality Management ,thermocline ,010504 meteorology & atmospheric sciences ,vesien tila ,phytoplankton pigments ,010501 environmental sciences ,01 natural sciences ,Ecosystem services ,ympäristön tila ,BU Contaminants & Toxins ,Environmental monitoring ,Limnology ,lakes ,ddc:550 ,Canvi climàtic ,Geosciences, Multidisciplinary ,Survey ,ComputingMilieux_MISCELLANEOUS ,ddc:333.7-333.9 ,Climate-Change ,Europe Lakes ,Environmental resource management ,[Belirlenecek] ,Climate-change ecology ,plankton ,Eutrophication ,6. Clean water ,Computer Science Applications ,Europe ,Disparate system ,data ,international ,Bloom ,Statistics, Probability and Uncertainty ,Europa ,Environmental Monitoring ,Information Systems ,environmental variables ,Statistics and Probability ,Biological pigments ,Fitoplàncton ,Climate Change ,Cyanotoxins ,ta1172 ,BU Contaminanten & Toxines ,Climate change ,observation design ,Library and Information Sciences ,Cyanobacteria ,järvet ,Education ,European Multi Lake ,cyanotoxins ,ddc:570 ,Life Science ,Ecosystem ,14. Life underwater ,database creation objective ,syanobakteerit ,0105 earth and related environmental sciences ,WIMEK ,business.industry ,data analysis objective ,nutrient ,muuttujat ,Pigments, Biological ,15. Life on land ,Climatic changes ,dataset ,phytoplankton ,pigments ,mikrolevät ,Aquatische Ecologie en Waterkwaliteitsbeheer ,Environmental variables ,Phytoplankton pigments ,Multidisciplinär geovetenskap ,Climatic change ,Lakes ,13. Climate action ,Nutrient pollution ,Phytoplankton ,Environmental science ,[SDE.BE]Environmental Sciences/Biodiversity and Ecology ,business ,Lake ecology ,Canvis climàtics ,Waters - Abstract
Under ongoing climate change and increasing anthropogenic activity, which continuously challenge ecosystem resilience, an in-depth understanding of ecological processes is urgently needed. Lakes, as providers of numerous ecosystem services, face multiple stressors that threaten their functioning. Harmful cyanobacterial blooms are a persistent problem resulting from nutrient pollution and climate-change induced stressors, like poor transparency, increased water temperature and enhanced stratification. Consistency in data collection and analysis methods is necessary to achieve fully comparable datasets and for statistical validity, avoiding issues linked to disparate data sources. The European Multi Lake Survey (EMLS) in summer 2015 was an initiative among scientists from 27 countries to collect and analyse lake physical, chemical and biological variables in a fully standardized manner. This database includes in-situ lake variables along with nutrient, pigment and cyanotoxin data of 369 lakes in Europe, which were centrally analysed in dedicated laboratories. Publishing the EMLS methods and dataset might inspire similar initiatives to study across large geographic areas that will contribute to better understanding lake responses in a changing environment., The authors acknowledge COST Action ES 1105 “CYANOCOST – Cyanobacterial blooms and toxins in water resources: Occurrence impacts and management” and COST Action ES 1201 “NETLAKE – Networking Lake Observatories in Europe” for contributing to this study through networking and knowledge sharing with European experts in the field. Evanthia Mantzouki was supported by a grant from the Swiss State Secretariat for Education, Research and Innovation (SERI) to Bas Ibelings and by supplementary funding from University of Geneva. We thank Wendy Beekman for the nutrient analysis and the University of Wageningen for covering the costs of this analysis from the personal funding of dr. Miquel Lürling. We thank Pieter Slot for assisting with the pigment analysis and the University of Amsterdam for covering the costs of the analysis through funding from the group of Prof. Jef Huisman and dr. Petra Visser (IBED). We would like to thank the Environmental Data Initiative for covering the cost of archiving the EMLS dataset. We would like to thank the Leibniz Institute of Freshwater Ecology and Inland Fisheries, Dept. of Experimental Limnology and the Aquatic Microbial Ecology Group for logistic and technical support of J. Fonvielle and H.-P. Grossart; and the Leibniz Association for financial support. The collection of data for Lough Erne and Lough Neagh were funded by the Department of Agriculture, Environment and Rural Affairs, Northern Ireland.
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- 2018
230. Data Descriptor : A European Multi Lake Survey dataset of environmental variables, phytoplankton pigments and cyanotoxins
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Mantzouki, Evanthia, Campbell, James, Loon, Emiel van, Visser, Petra, Konstantinou, Iosif, Antoniou, Maria G., Giuliani, Grégory, Machado-Vieira, Danielle, Oliveira, Alinne Gurjão de, Maronić, Dubravka Špoljarić, Stević, Filip, Fakioglu, Özden, Soylu, Elif Neyran, Yağcı, Meral Apaydın, Çınar, Şakir, Çapkın, Kadir, Yağcı, Abdulkadir, Cesur, Mehmet, Bilgin, Fuat, Bulut, Cafer, Fránková, Markéta, Vasconcelos, Vitor, Uysal, Rahmi, Köker, Latife, Akçaalan, Reyhan, Albay, Meriç, Alp, Mehmet Tahir, Özkan, Korhan, Sevindik, Tuğba Ongun, Tunca, Hatice, Önem, Burçin, Richardson, Jessica, Morais, João, Christoffersen, Kirsten Seestern, Edwards, Christine, Bergkemper, Victoria, O'Leary, Sarah, Beirne, Eilish, Cromie, Hannah, Ibelings, Bastiaan W., Warming, Trine Perlt, Feldmann, Tõnu, Laas, Alo, Vale, Micaela, Panksep, Kristel, Tuvikene, Lea, Kangro, Kersti, Häggqvist, Kerstin, Salmi, Pauliina, Arvola, Lauri, Fastner, Jutta, Straile, Dietmar, Rothhaupt, Karl-Otto, Fonvielle, Jeremy, Raposeiro, Pedro M., Grossart, Hans-Peter, Avagianos, Christos, Kaloudis, Triantafyllos, Triantis, Theodoros, Zervou, Sevasti-Kiriaki, Hiskia, Anastasia, Gkelis, Spyros, Panou, Manthos, McCarthy, Valerie, Perello, Victor C., Gonçalves, Vítor Manuel da Costa, Obertegger, Ulrike, Boscaini, Adriano, Flaim, Giovanna, Salmaso, Nico, Cerasino, Leonardo, Koreivienė, Judita, Karosienė, Jūratė, Kasperovičienė, Jūratė, Savadova, Ksenija, Vitonytė, Irma, Aleksovski, Boris, Haande, Sigrid, Skjelbred, Birger, Grabowska, Magdalena, Karpowicz, Maciej, Chmura, Damian, Nawrocka, Lidia, Kobos, Justyna, Mazur-Marzec, Hanna, Alcaraz-Párraga, Pablo, Wilk-Woźniak, Elżbieta, Krstić, Svetislav, Krztoń, Wojciech, Walusiak, Edward, Gagala, Ilona, Mankiewicz-Boczek, Joana, Toporowska, Magdalena, Pawlik-Skowronska, Barbara, Niedźwiecki, Michał, Pęczuła, Wojciech, Napiórkowska-Krzebietke, Agnieszka, Dunalska, Julita, Nemova, Hana, Sieńska, Justyna, Szymański, Daniel, Kruk, Marek, Budzyńska, Agnieszka, Goldyn, Ryszard, Kozak, Anna, Rosińska, Joanna, Szeląg-Wasielewska, Elżbieta, Domek, Piotr, Jakubowska-Krepska, Natalia, Drastichova, Iveta, Kwasizur, Kinga, Messyasz, Beata, Pełechata, Aleksandra, Pełechaty, Mariusz, Kokocinski, Mikolaj, Madrecka, Beata, Kostrzewska-Szlakowska, Iwona, Frąk, Magdalena, Bańkowska-Sobczak, Agnieszka, Wasilewicz, Michał, Chomova, Lucia, Ochocka, Agnieszka, Pasztaleniec, Agnieszka, Jasser, Iwona, Geraldes, Ana Maria, Leira, Manel, Hernández, Armand, Pfeiffer, Tanja Žuna, Remec-Rekar, Spela, Elersek, Tina, Delgado-Martín, Jordi, García, David, Cereijo, Jose Luís, Gomà, Joan, Trapote, Mari Carmen, Vegas-Vilarrúbia, Teresa, Obrador, Biel, García-Murcia, Ana, Vucelić, Itana Bokan, Real, Monserrat, Romans, Elvira, Noguero-Ribes, Jordi, Duque, David Parreño, Fernández-Morán, Elísabeth, Úbeda, Bárbara, Gálvez, José Ángel, Marcé, Rafael, Catalán, Núria, Pérez-Martínez, Carmen, Žutinić, Petar, Ramos-Rodríguez, Eloísa, Cillero-Castro, Carmen, Moreno-Ostos, Enrique, Blanco, José María, Rodríguez, Valeriano, Montes-Pérez, Jorge Juan, Palomino, Roberto L., Rodríguez-Pérez, Estela, Carballeira, Rafael, Camacho, Antonio, Udovič, Marija Gligora, Picazo, Antonio, Rochera, Carlos, Santamans, Anna C., Ferriol, Carmen, Romo, Susana, Soria, Juan Miguel, Hansson, Lars-Anders, Urrutia-Cordero, Pablo, Özen, Arda, Bravo, Andrea G., Plenković-Moraj, Anđelka, Buck, Moritz, Colom-Montero, William, Mustonen, Kristiina, Pierson, Don, Yang, Yang, Verspagen, Jolanda M.H., Domis, Lisette N. de Senerpont, Seelen, Laura, Teurlincx, Sven, Verstijnen, Yvon, Tsiarta, Nikoletta, Lürling, Miquel, Maliaka, Valentini, Faassen, Elisabeth J., Latour, Delphine, Carey, Cayelan C., Paerl, Hans W., Torokne, Andrea, Karan, Tünay, Demir, Nilsun, Beklioğlu, Meryem, Bláha, Luděk, Filiz, Nur, Levi, Eti E., Iskin, Uğur, Bezirci, Gizem, Tavşanoğlu, Ülkü Nihan, Çelik, Kemal, Özhan, Koray, Karakaya, Nusret, Koçer, Mehmet Ali Turan, Yilmaz, Mete, Geriš, Rodan, Maraşlıoğlu, Faruk, and Institute of Agricultural and Environmental Sciences
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Europe ,ddc:570 ,Settore BIO/07 - ECOLOGIA ,datasets ,lakes ,articles ,Phytoplankton pigments ,Institut für Biochemie und Biologie ,Dataset - Abstract
Under ongoing climate change and increasing anthropogenic activity, which continuously challenge ecosystem resilience, an in-depth understanding of ecological processes is urgently needed. Lakes, as providers of numerous ecosystem services, face multiple stressors that threaten their functioning. Harmful cyanobacterial blooms are a persistent problem resulting from nutrient pollution and climate-change induced stressors, like poor transparency, increased water temperature and enhanced stratification. Consistency in data collection and analysis methods is necessary to achieve fully comparable datasets and for statistical validity, avoiding issues linked to disparate data sources. The European Multi Lake Survey (EMLS) in summer 2015 was an initiative among scientists from 27 countries to collect and analyse lake physical, chemical and biological variables in a fully standardized manner. This database includes in-situ lake variables along with nutrient, pigment and cyanotoxin data of 369 lakes in Europe, which were centrally analysed in dedicated laboratories. Publishing the EMLS methods and dataset might inspire similar initiatives to study across large geographic areas that will contribute to better understanding lake responses in a changing environment. The authors acknowledge COST Action ES 1105 “CYANOCOST – Cyanobacterial blooms and toxins in water resources: Occurrence impacts and management” and COST Action ES 1201 “NETLAKE – Networking Lake Observatories in Europe” for contributing to this study through networking and knowledge sharing with European experts in the field. Evanthia Mantzouki was supported by a grant from the Swiss State Secretariat for Education, Research and Innovation (SERI) to Bas Ibelings and by supplementary funding from University of Geneva. We thank Wendy Beekman for the nutrient analysis and the University of Wageningen for covering the costs of this analysis from the personal funding of dr. Miquel Lürling. We thank Pieter Slot for assisting with the pigment analysis and the University of Amsterdam for covering the costs of the analysis through funding from the group of Prof. Jef Huisman and dr. Petra Visser (IBED). We would like to thank the Environmental Data Initiative for covering the cost of archiving the EMLS dataset. We would like to thank the Leibniz Institute of Freshwater Ecology and Inland Fisheries, Dept. of Experimental Limnology and the Aquatic Microbial Ecology Group for logistic and technical support of J. Fonvielle and H.-P. Grossart; and the Leibniz Association for financial support. The collection of data for Lough Erne and Lough Neagh were funded by the Department of Agriculture, Environment and Rural Affairs, Northern Ireland. The authors acknowledge COST Action ES 1105 “CYANOCOST – Cyanobacterial blooms and toxins in water resources: Occurrence impacts and management” and COST Action ES 1201 “NETLAKE – Networking Lake Observatories in Europe” for contributing to this study through networking and knowledge sharing with European experts in the field. Evanthia Mantzouki was supported by a grant from the Swiss State Secretariat for Education, Research and Innovation (SERI) to Bas Ibelings and by supplementary funding from University of Geneva. We thank Wendy Beekman for the nutrient analysis and the University of Wageningen for covering the costs of this analysis from the personal funding of dr. Miquel Lürling. We thank Pieter Slot for assisting with the pigment analysis and the University of Amsterdam for covering the costs of the analysis through funding from the group of Prof. Jef Huisman and dr. Petra Visser (IBED). We would like to thank the Environmental Data Initiative for covering the cost of archiving the EMLS dataset. We would like to thank the Leibniz Institute of Freshwater Ecology and Inland Fisheries, Dept. of Experimental Limnology and the Aquatic Microbial Ecology Group for logistic and technical support of J. Fonvielle and H.-P. Grossart; and the Leibniz Association for financial support. The collection of data for Lough Erne and Lough Neagh were funded by the Department of Agriculture, Environment and Rural Affairs, Northern Ireland.
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- 2018
231. THE FACTORS INFLUENCING BUSINESS ONLINE ENTREPENEURS IN CHOOSING DELIVERY SERVICE
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Andre Yosafat, Hiskia Simarmata, Ivan Sadrakh, and Juliater Simarmata
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Service (business) ,Service quality ,Brand image ,Service delivery framework ,business.industry ,Value (economics) ,Business ,E-commerce ,Market share ,Marketing ,Service innovation - Abstract
The development of technology and information to make millennial society now began to change the way shopping that initially shop conventionally to shop online, The rapid growth of e-commerce market share in Indonesia is already no doubt. With the number of internet users reaching the number 82 million people or about 30% of the total population in Indonesia, the e-commerce market into a gold mine is very tempting for some people who can see the potential for the future. This growth is supported by data from the Minister of Communications which states that the value of e-commerce transactions in 2013 reached Rp130 trillion, so that online business is now starting to grow and many people become online business, this makes the online business requires a service delivery right to send the goods to the buyer, there are some companies that are well known delivery service delivery by the community such as TIKI (Titipan Kilat), JNE, SICEPAT, J & T EXPRESS, in this study researchers conducted a survey of 34 respondents of online business and in this study researchers only choose 2 companies that have TIKI brand image and J & T Express company which is a startup company that is in demand by online business, the aspect that will be compared between 2 companies is Brand Image, Price, Kind of Service, Service Quality, & Service innovation with comparative TIKI results Brand and J & T express at an affordable price.
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- 2018
232. Diversity, Cyanotoxin Production, and Bioactivities of Cyanobacteria Isolated from Freshwaters of Greece
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Gkelis, Spyros, primary, Panou, Manthos, additional, Konstantinou, Despoina, additional, Apostolidis, Panagiotis, additional, Kasampali, Antonia, additional, Papadimitriou, Sofia, additional, Kati, Dominiki, additional, Di Lorenzo, Giorgia, additional, Ioakeim, Stamatia, additional, Zervou, Sevasti-Kiriaki, additional, Christophoridis, Christophoros, additional, Triantis, Theodoros, additional, Kaloudis, Triantafyllos, additional, Hiskia, Anastasia, additional, and Arsenakis, Minas, additional
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- 2019
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233. Leptothoe , a new genus of marine cyanobacteria (Synechococcales) and three new species associated with sponges from the Aegean Sea
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Konstantinou, Despoina, primary, Voultsiadou, Eleni, additional, Panteris, Emmanuel, additional, Zervou, Sevasti‐Kiriaki, additional, Hiskia, Anastasia, additional, and Gkelis, Spyros, additional
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- 2019
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234. Fluid evolution of Umbul-Telomoyo Geothermal system
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Annisa, Hiskia Ulinuha, primary, Niniek Rina, Herdianita, additional, and Hermawan, Dudi, additional
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- 2019
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235. Web-Based Learning Media Using Hypertext Markup Language as Course Materials
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Manggopa, Hiskia Kamang, primary, Manoppo, Christine Takarina Meitty, additional, Togas, Peggy Veronica, additional, Mewengkang, Alfrina, additional, and Batmetan, Johan Reimon, additional
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- 2019
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236. Membrane Lipidome Reorganization and Accumulation of Tissue DNA Lesions in Tumor-Bearing Mice: An Exploratory Study
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Krokidis, Marios G., primary, Louka, Maria, additional, Efthimiadou, Eleni K., additional, Zervou, Sevasti-Kiriaki, additional, Papadopoulos, Kyriakos, additional, Hiskia, Anastasia, additional, Ferreri, Carla, additional, and Chatgilialoglu, Chryssostomos, additional
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- 2019
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237. Neurotoxin BMAA and its isomeric amino acids in cyanobacteria and cyanobacteria-based food supplements
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Manolidi, Korina, primary, Triantis, Theodoros M., additional, Kaloudis, Triantafyllos, additional, and Hiskia, Anastasia, additional
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- 2019
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238. The Development of Web Learning as Media to Deliver Web Programming Materials
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Manggopa, Hiskia Kamang, primary, Kenap, Audy Aldrin, primary, Manoppo, Christine Takarina Meitty, primary, Batmetan, Johan Reimon, primary, and Mewengkang, Alfrina, primary
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- 2019
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239. Multi-electron reduction of Wells–Dawson polyoxometalate films onto metallic, semiconducting and dielectric substrates
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Douvas, Antonios M., primary, Tsikritzis, Dimitris, additional, Tselios, Charalampos, additional, Haider, Ali, additional, Mougharbel, Ali S., additional, Kortz, Ulrich, additional, Hiskia, Anastasia, additional, Coutsolelos, Athanassios G., additional, Palilis, Leonidas C., additional, Vasilopoulou, Maria, additional, Kennou, Stella, additional, and Argitis, Panagiotis, additional
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- 2019
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240. Co-creating personal augmented reality accessories to enhance social well-being of urban San youth
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Kauhondamwa, Maria, primary, Winschiers-Theophilus, Heike, additional, Kapembe, Simson, additional, Costa, Hiskia, additional, Guxab, Jan, additional, Kamati, Isay, additional, and Afrikaner, Helena, additional
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- 2018
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241. A Greek Cylindrospermopsis raciborskii strain: Missing link in tropic invader’s phylogeography tale
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Panou, Manthos, primary, Zervou, Sevasti-Kiriaki, additional, Kaloudis, Triantafyllos, additional, Hiskia, Anastasia, additional, and Gkelis, Spyros, additional
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- 2018
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242. A European Multi Lake Survey dataset of environmental variables, phytoplankton pigments and cyanotoxins
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Mantzouki, Evanthia, primary, Campbell, James, additional, van Loon, Emiel, additional, Visser, Petra, additional, Konstantinou, Iosif, additional, Antoniou, Maria, additional, Giuliani, Grégory, additional, Machado-Vieira, Danielle, additional, Gurjão de Oliveira, Alinne, additional, Maronić, Dubravka Špoljarić, additional, Stević, Filip, additional, Pfeiffer, Tanja Žuna, additional, Vucelić, Itana Bokan, additional, Žutinić, Petar, additional, Udovič, Marija Gligora, additional, Plenković-Moraj, Anđelka, additional, Tsiarta, Nikoletta, additional, Bláha, Luděk, additional, Geriš, Rodan, additional, Fránková, Markéta, additional, Christoffersen, Kirsten Seestern, additional, Warming, Trine Perlt, additional, Feldmann, Tõnu, additional, Laas, Alo, additional, Panksep, Kristel, additional, Tuvikene, Lea, additional, Kangro, Kersti, additional, Häggqvist, Kerstin, additional, Salmi, Pauliina, additional, Arvola, Lauri, additional, Fastner, Jutta, additional, Straile, Dietmar, additional, Rothhaupt, Karl-Otto, additional, Fonvielle, Jeremy, additional, Grossart, Hans-Peter, additional, Avagianos, Christos, additional, Kaloudis, Triantafyllos, additional, Triantis, Theodoros, additional, Zervou, Sevasti-Kiriaki, additional, Hiskia, Anastasia, additional, Gkelis, Spyros, additional, Panou, Manthos, additional, McCarthy, Valerie, additional, Perello, Victor C., additional, Obertegger, Ulrike, additional, Boscaini, Adriano, additional, Flaim, Giovanna, additional, Salmaso, Nico, additional, Cerasino, Leonardo, additional, Koreivienė, Judita, additional, Karosienė, Jūratė, additional, Kasperovičienė, Jūratė, additional, Savadova, Ksenija, additional, Vitonytė, Irma, additional, Haande, Sigrid, additional, Skjelbred, Birger, additional, Grabowska, Magdalena, additional, Karpowicz, Maciej, additional, Chmura, Damian, additional, Nawrocka, Lidia, additional, Kobos, Justyna, additional, Mazur-Marzec, Hanna, additional, Alcaraz-Párraga, Pablo, additional, Wilk-Woźniak, Elżbieta, additional, Krztoń, Wojciech, additional, Walusiak, Edward, additional, Gagala, Ilona, additional, Mankiewicz-Boczek, Joana, additional, Toporowska, Magdalena, additional, Pawlik-Skowronska, Barbara, additional, Niedźwiecki, Michał, additional, Pęczuła, Wojciech, additional, Napiórkowska-Krzebietke, Agnieszka, additional, Dunalska, Julita, additional, Sieńska, Justyna, additional, Szymański, Daniel, additional, Kruk, Marek, additional, Budzyńska, Agnieszka, additional, Goldyn, Ryszard, additional, Kozak, Anna, additional, Rosińska, Joanna, additional, Szeląg-Wasielewska, Elżbieta, additional, Domek, Piotr, additional, Jakubowska-Krepska, Natalia, additional, Kwasizur, Kinga, additional, Messyasz, Beata, additional, Pełechata, Aleksandra, additional, Pełechaty, Mariusz, additional, Kokocinski, Mikolaj, additional, Madrecka, Beata, additional, Kostrzewska-Szlakowska, Iwona, additional, Frąk, Magdalena, additional, Bańkowska-Sobczak, Agnieszka, additional, Wasilewicz, Michał, additional, Ochocka, Agnieszka, additional, Pasztaleniec, Agnieszka, additional, Jasser, Iwona, additional, Antão-Geraldes, Ana M., additional, Leira, Manel, additional, Hernández, Armand, additional, Vasconcelos, Vitor, additional, Morais, João, additional, Vale, Micaela, additional, Raposeiro, Pedro M., additional, Gonçalves, Vítor, additional, Aleksovski, Boris, additional, Krstić, Svetislav, additional, Nemova, Hana, additional, Drastichova, Iveta, additional, Chomova, Lucia, additional, Remec-Rekar, Spela, additional, Elersek, Tina, additional, Delgado-Martín, Jordi, additional, García, David, additional, Cereijo, Jose Luís, additional, Gomà, Joan, additional, Trapote, Mari Carmen, additional, Vegas-Vilarrúbia, Teresa, additional, Obrador, Biel, additional, García-Murcia, Ana, additional, Real, Monserrat, additional, Romans, Elvira, additional, Noguero-Ribes, Jordi, additional, Duque, David Parreño, additional, Fernández-Morán, Elísabeth, additional, Úbeda, Bárbara, additional, Gálvez, José Ángel, additional, Marcé, Rafael, additional, Catalán, Núria, additional, Pérez-Martínez, Carmen, additional, Ramos-Rodríguez, Eloísa, additional, Cillero-Castro, Carmen, additional, Moreno-Ostos, Enrique, additional, Blanco, José María, additional, Rodríguez, Valeriano, additional, Montes-Pérez, Jorge Juan, additional, Palomino, Roberto L., additional, Rodríguez-Pérez, Estela, additional, Carballeira, Rafael, additional, Camacho, Antonio, additional, Picazo, Antonio, additional, Rochera, Carlos, additional, Santamans, Anna C., additional, Ferriol, Carmen, additional, Romo, Susana, additional, Soria, Juan Miguel, additional, Hansson, Lars-Anders, additional, Urrutia-Cordero, Pablo, additional, Özen, Arda, additional, Bravo, Andrea G., additional, Buck, Moritz, additional, Colom-Montero, William, additional, Mustonen, Kristiina, additional, Pierson, Don, additional, Yang, Yang, additional, M. H. Verspagen, Jolanda, additional, de Senerpont Domis, Lisette N., additional, Seelen, Laura, additional, Teurlincx, Sven, additional, Verstijnen, Yvon, additional, Lürling, Miquel, additional, Maliaka, Valentini, additional, Faassen, Elisabeth J., additional, Latour, Delphine, additional, Carey, Cayelan C., additional, W. Paerl, Hans, additional, Torokne, Andrea, additional, Karan, Tünay, additional, Demir, Nilsun, additional, Beklioğlu, Meryem, additional, Filiz, Nur, additional, E. Levi, Eti, additional, Iskin, Uğur, additional, Bezirci, Gizem, additional, Tavşanoğlu, Ülkü Nihan, additional, Çelik, Kemal, additional, Özhan, Koray, additional, Karakaya, Nusret, additional, Koçer, Mehmet Ali Turan, additional, Yilmaz, Mete, additional, Maraşlıoğlu, Faruk, additional, Fakioglu, Özden, additional, Soylu, Elif Neyran, additional, Yağcı, Meral Apaydın, additional, Çınar, Şakir, additional, Çapkın, Kadir, additional, Yağcı, Abdulkadir, additional, Cesur, Mehmet, additional, Bilgin, Fuat, additional, Bulut, Cafer, additional, Uysal, Rahmi, additional, Köker, Latife, additional, Akçaalan, Reyhan, additional, Albay, Meriç, additional, Alp, Mehmet Tahir, additional, Özkan, Korhan, additional, Sevindik, Tuğba Ongun, additional, Tunca, Hatice, additional, Önem, Burçin, additional, Richardson, Jessica, additional, Edwards, Christine, additional, Bergkemper, Victoria, additional, O'Leary, Sarah, additional, Beirne, Eilish, additional, Cromie, Hannah, additional, and Ibelings, Bastiaan W., additional
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- 2018
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243. Stratification strength and light climate explain variation in chlorophyll aat the continental scale in a European multilake survey in a heatwave summer
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Donis, Daphne, Mantzouki, Evanthia, McGinnis, Daniel F., Vachon, Dominic, Gallego, Irene, Grossart, Hans‐Peter, Senerpont Domis, Lisette N., Teurlincx, Sven, Seelen, Laura, Lürling, Miquel, Verstijnen, Yvon, Maliaka, Valentini, Fonvielle, Jeremy, Visser, Petra M., Verspagen, Jolanda, Herk, Maria, Antoniou, Maria G., Tsiarta, Nikoletta, McCarthy, Valerie, Perello, Victor C., Machado‐Vieira, Danielle, Oliveira, Alinne Gurjão, Maronić, Dubravka Špoljarić, Stević, Filip, Pfeiffer, Tanja Žuna, Vucelić, Itana Bokan, Žutinić, Petar, Udovič, Marija Gligora, Plenković‐Moraj, Anđelka, Bláha, Luděk, Geriš, Rodan, Fránková, Markéta, Christoffersen, Kirsten Seestern, Warming, Trine Perlt, Feldmann, Tõnu, Laas, Alo, Panksep, Kristel, Tuvikene, Lea, Kangro, Kersti, Koreivienė, Judita, Karosienė, Jūratė, Kasperovičienė, Jūratė, Savadova‐Ratkus, Ksenija, Vitonytė, Irma, Häggqvist, Kerstin, Salmi, Pauliina, Arvola, Lauri, Rothhaupt, Karl, Avagianos, Christos, Kaloudis, Triantafyllos, Gkelis, Spyros, Panou, Manthos, Triantis, Theodoros, Zervou, Sevasti‐Kiriaki, Hiskia, Anastasia, Obertegger, Ulrike, Boscaini, Adriano, Flaim, Giovanna, Salmaso, Nico, Cerasino, Leonardo, Haande, Sigrid, Skjelbred, Birger, Grabowska, Magdalena, Karpowicz, Maciej, Chmura, Damian, Nawrocka, Lidia, Kobos, Justyna, Mazur‐Marzec, Hanna, Alcaraz‐Párraga, Pablo, Wilk‐Woźniak, Elżbieta, Krztoń, Wojciech, Walusiak, Edward, Gagala‐Borowska, Ilona, Mankiewicz‐Boczek, Joana, Toporowska, Magdalena, Pawlik‐Skowronska, Barbara, Niedźwiecki, Michał, Pęczuła, Wojciech, Napiórkowska‐Krzebietke, Agnieszka, Dunalska, Julita, Sieńska, Justyna, Szymański, Daniel, Kruk, Marek, Budzyńska, Agnieszka, Goldyn, Ryszard, Kozak, Anna, Rosińska, Joanna, Szeląg‐Wasielewska, Elżbieta, Domek, Piotr, Jakubowska‐Krepska, Natalia, Kwasizur, Kinga, Messyasz, Beata, Pełechata, Aleksandra, Pełechaty, Mariusz, Kokocinski, Mikolaj, Madrecka‐Witkowska, Beata, Kostrzewska‐Szlakowska, Iwona, Frąk, Magdalena, Bańkowska‐Sobczak, Agnieszka, Wasilewicz, Michał, Ochocka, Agnieszka, Pasztaleniec, Agnieszka, Jasser, Iwona, Antão‐Geraldes, Ana M., Leira, Manel, Vasconcelos, Vitor, Morais, Joao, Vale, Micaela, Raposeiro, Pedro M., Gonçalves, Vítor, Aleksovski, Boris, Krstić, Svetislav, Nemova, Hana, Drastichova, Iveta, Chomova, Lucia, Remec‐Rekar, Spela, Elersek, Tina, Hansson, Lars‐Anders, Urrutia‐Cordero, Pablo, Bravo, Andrea G., Buck, Moritz, Colom‐Montero, William, Mustonen, Kristiina, Pierson, Don, Yang, Yang, Richardson, Jessica, Edwards, Christine, Cromie, Hannah, Delgado‐Martín, Jordi, García, David, Cereijo, Jose Luís, Gomà, Joan, Trapote, Mari Carmen, Vegas‐Vilarrúbia, Teresa, Obrador, Biel, García‐Murcia, Ana, Real, Monserrat, Romans, Elvira, Noguero‐Ribes, Jordi, Duque, David Parreño, Fernández‐Morán, Elísabeth, Úbeda, Bárbara, Gálvez, José Ángel, Catalán, Núria, Pérez‐Martínez, Carmen, Ramos‐Rodríguez, Eloísa, Cillero‐Castro, Carmen, Moreno‐Ostos, Enrique, Blanco, José María, Rodríguez, Valeriano, Montes‐Pérez, Jorge Juan, Palomino, Roberto L., Rodríguez‐Pérez, Estela, Hernández, Armand, Carballeira, Rafael, Camacho, Antonio, Picazo, Antonio, Rochera, Carlos, Santamans, Anna C., Ferriol, Carmen, Romo, Susana, Soria, Juan Miguel, Özen, Arda, Karan, Tünay, Demir, Nilsun, Beklioğlu, Meryem, Filiz, Nur, Levi, Eti, Iskin, Uğur, Bezirci, Gizem, Tavşanoğlu, Ülkü Nihan, Çelik, Kemal, Ozhan, Koray, Karakaya, Nusret, Koçer, Mehmet Ali Turan, Yilmaz, Mete, Maraşlıoğlu, Faruk, Fakioglu, Özden, Soylu, Elif Neyran, Yağcı, Meral Apaydın, Çınar, Şakir, Çapkın, Kadir, Yağcı, Abdulkadir, Cesur, Mehmet, Bilgin, Fuat, Bulut, Cafer, Uysal, Rahmi, Latife, Köker, Akçaalan, Reyhan, Albay, Meriç, Alp, Mehmet Tahir, Özkan, Korhan, Sevindik, Tuğba Ongun, Tunca, Hatice, Önem, Burçin, Paerl, Hans, Carey, Cayelan C., and Ibelings, Bastiaan W.
- Abstract
To determine the drivers of phytoplankton biomass, we collected standardized morphometric, physical, and biological data in 230 lakes across the Mediterranean, Continental, and Boreal climatic zones of the European continent. Multilinear regression models tested on this snapshot of mostly eutrophic lakes (median total phosphorus [TP] = 0.06 and total nitrogen [TN] = 0.7 mg L−1), and its subsets (2 depth types and 3 climatic zones), show that light climate and stratification strength were the most significant explanatory variables for chlorophyll a(Chl a) variance. TN was a significant predictor for phytoplankton biomass for shallow and continental lakes, while TP never appeared as an explanatory variable, suggesting that under high TP, light, which partially controls stratification strength, becomes limiting for phytoplankton development. Mediterranean lakes were the warmest yet most weakly stratified and had significantly less Chl athan Boreal lakes, where the temperature anomaly from the long‐term average, during a summer heatwave was the highest (+4°C) and showed a significant, exponential relationship with stratification strength. This European survey represents a summer snapshot of phytoplankton biomass and its drivers, and lends support that light and stratification metrics, which are both affected by climate change, are better predictors for phytoplankton biomass in nutrient‐rich lakes than nutrient concentrations and surface temperature.
- Published
- 2021
- Full Text
- View/download PDF
244. Photolytic degradation of all chlorophenols with polyoxometallates and H 2O 2
- Author
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Antonaraki, S., Androulaki, E., Dimotikali, D., Hiskia, A., and Papaconstantinou, E.
- Published
- 2002
- Full Text
- View/download PDF
245. Thermal and photochemical catalysis by polyoxometallates Regeneration of catalyst by dioxygen
- Author
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Hiskia, A., primary and Papaconstantinou, E., additional
- Published
- 1991
- Full Text
- View/download PDF
246. Evaluation of the photocatalytic activity of TiO2 based catalysts for the degradation and mineralization of cyanobacterial toxins and water off-odor compounds under UV-A, solar and visible light
- Author
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Theodora Fotiou, Triantafyllos Kaloudis, Anastasia Hiskia, and Theodoros M. Triantis
- Subjects
Chemistry ,General Chemical Engineering ,General Chemistry ,Mineralization (soil science) ,Photochemistry ,Industrial and Manufacturing Engineering ,Catalysis ,chemistry.chemical_compound ,Light intensity ,Adsorption ,Environmental chemistry ,Titanium dioxide ,Photocatalysis ,Environmental Chemistry ,Irradiation ,Visible spectrum - Abstract
Research on the development of new TiO2 based photocatalysts has been receiving increased attention due to the ability of TiO2 to degrade a great variety of organic compounds upon UV-A irradiation. In order to evaluate the photocatalytic performance of the new synthesized materials, it is essential to follow specific procedures during the photocatalytic process. Special care should be given on light intensity, presence of oxygen, catalyst loading, initial concentration of substrate, adsorption, pH, different irradiation wavelength, mineralization, intermediate products and toxicity. In this study, catalysts such as commercially available materials (Degussa P25, Kronos vlp-7000) and home prepared materials (N-TiO2, GO–TiO2 and Ref-TiO2) have been tested for their photocatalytic ability on the degradation and mineralization of the cyanobacterial toxin microcystin-LR and off-odor causing compounds (geosmin, 2-methylisoborneol) under UV-A, solar and visible light irradiation. Also, the identification of intermediate products and their toxicity under different experimental conditions for microcystin-LR was studied. Our results showed that in all cases of the compounds Degussa P25 was the better performing catalyst under UV-A light irradiation. Under solar light, all compounds were effectively degraded with the doped materials (N-TiO2, GO–TiO2, Kronos vlp-7000) showing better photocatalytic performance than theirs undoped material (Ref-TiO2). As far as concerning visible light irradiation, only the visible light activated materials showed some photocatalytic activity (N-TiO2, Kronos vlp-7000). It was also showed in order to have reproducible evaluation results on the photocatalytic performance of several catalysts (intra and inter-laboratory), a careful selection of experimental parameters is required.
- Published
- 2015
247. Photocatalytic transformations of CCl3Br, CBr3F, CHCl2Br and CH2BrCl in aerobic and anaerobic conditions
- Author
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Calza, Paola, Minero, Claudio, Hiskia, Anastasia, Papaconstantinou, Elias, and Pelizzetti, Ezio
- Published
- 2001
- Full Text
- View/download PDF
248. Circuit Design for Sensor Detection Signal Conditioner Nitrate Content
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Robeth Manurung, Aminuddin Debataraja, and Hiskia Hiskia
- Subjects
amperometric, conductive polymer, electropolymerization, ion sensor, nitrate ,lcsh:TA1-2040 ,lcsh:Engineering (General). Civil engineering (General) - Abstract
Nitrate is one of macro nutrients very important for agriculture. The availability of nitrate in soil is limited because it is very easy to leaching by rain, therefore nitrate could be contaminated ground water by over-process of fertilizer. This process could also produce inefficiency in agriculture if it happened continuesly without pre-analysis of farm field. The answer those problems, it is need to develop the ion sensor system to measure concentrations of nitrat in soil. The system is consist of nitrate ion sensor device, signal conditioning and data acquisition circuit. The design and fabrications of signal conditioning circuit which integrated into ion nitrate sensor system and will apply for agriculture. This sensor has been used amperometric with three electrodes configuration: working, reference and auxiliarry; the ion senstive membrane has use conductive polymer. The screen printing technique has been choosen to fabricate electrodes and deposition technique for ion sensitive membrane is electropolymerization. The characterization of sensor has been conducted using nitrate standard solution with range of concentration between 1 µM–1 mM. The characterization has shown that sensor has a good response with cureent output between 2.8–4.71 µA, liniearity factor is 99.65% and time response 250 second.
- Published
- 2011
249. Monitoring a newly re-born patient: water quality and cyanotoxin occurrence in a reconstructed shallow Mediterranean lake
- Author
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Manthos Panou, Chrysoula Ntislidou, Triantafyllos Kaloudis, Spyros Gkelis, Sevasti-Kiriaki Zervou, Ioannis Chronis, Ifigenia Kagalou, Christophoros Christophoridis, Theodoros M. Triantis, Korina Manolidi, Maria Lazaridou, and Anastasia Hiskia
- Subjects
0106 biological sciences ,010501 environmental sciences ,Aquatic Science ,aaxitoxin ,Oceanography ,Cyanobacteria ,01 natural sciences ,Algal bloom ,Anatoxin-a ,chemistry.chemical_compound ,nutrient loads ,Microcystis ,lcsh:QH540-549.5 ,Phytoplankton ,cylindrospermopsin ,microcystins ,anatoxin-a ,0105 earth and related environmental sciences ,biology ,Ecology ,010604 marine biology & hydrobiology ,Cyanotoxin ,biology.organism_classification ,Monitoring program ,chemistry ,Benthic zone ,Environmental science ,lcsh:Ecology ,Eutrophication - Abstract
Lake Karla (Central Greece) is a unique example - at European scale - of a shallow lake ecosystem that was dried in the 1960s and in 2009 started to be restored. The lake is listed in the network of the Greek protected areas as it is considered a vital aquatic ecosystem, in terms of biodiversity. It has, however, already been adversely affected by both agricultural and industrial land uses in the surrounding area, leading to eutrophication and shifting algal community towards bloom-forming toxic cyanobacterial species. After repeated heavy-blooms, cyanotoxin occurrence and mass fish kills, the local ecosystem management authority has implemented a water quality monitoring program (July 2013 - July 2015) to assess environmental pressures and the response of aquatic biota in the lake. Microscopic, immunological, and molecular techniques combined with physico-chemical parameters, complemented by liquid chromatography tandem mass spectrometry (LC-MS/MS), were used to monitor cyanobacteria blooms and the associated cyanotoxin production from three different sites in Lake Karla and from the adjacent Kalamaki Reservoir. Water quality was also assessed by the structure of benthic invertebrate community on the sediment. Cyanobacteria were the main phytoplankton component, representing more than 70% of the total phytoplankton abundance; dominant taxa belonged toCylindrospermopsis raciborskii,Limnothrix redekei,Anabaenopsis elenkinii, andMicrocystisspp. Euglenophytes (Euglena), diatoms (Nitzschia), and chlorophytes (Scenedesmus) were also important phytoplankton constituents. LC-MS/MS confirmed the co-occurrence of microcystins, cylindrospermopsin, saxitoxin, neo-saxitoxin and anatoxin-a. The occurrence of cyanotoxins in relation to the persistent and dominant cyanobacteria and the impact of cyanobacterial harmful algal blooms on the newly constructed lake along with the land uses and the emergent mitigation measures are discussed. 
- Published
- 2017
250. PENGARUH GAYA KEPEMIMPINAN, KOMUNIKASI, DAN PEMBAGIAN KERJA TERHADAP KINERJA KARYAWAN PADA PT. SINAR GALESONG PRIMA MANDADO
- Author
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Manaroinsong, Hiskia P., Dotulong, Lucky O., and Taroreh, Rita N.
- Abstract
Sumber daya manusia merupakan bagian dari keseluruhan manajemen sumber daya yang ada dan tersedia dalam suatu perusahaan. Gaya kepemimpinan, komunikasi, dan pembagian kerja dapat mempengaruhi kinerja karyawan dari suatu organisasi atau perusahaan. Penggunaan tenaga kerja yang efektif dan terarah merupakan kunci kearah peningkatan kinerja karyawan sehingga kinerja karyawan yang tinggi akan berpengaruh terhadap kinerja perusahaan secara keseluruhan. Tujuan penelitian ini yaitu untuk mengetahui pengaruh gaya kepemimpinan, komunikasi, dan pembagian kerja terhadap kinerja karyawan pada PT. Sinar Galesong Prima Manado. Metode yang digunakan adalah analisis regresi linier berganda. Populasi penelitian sebanyak 66 karyawan dan sampel yang digunakan sebanyak 65 responden. Hasil penelitian menunjukan bahwa gaya kepemimpinan, komunikasi, dan pembagian kerja berpengaruh secara signifikan terhadap kinerja karyawan PT. Sinar Galesong Prima Manado. Sebaiknya komunikasi yang ada dalam perusahaan di tingkatkan lagi agar tercipta kerja sama yang serasi untuk mencapai tujuan perusahaanKata kunci: gaya kepemimpinan, komunikasi, pembagian kerja
- Published
- 2017
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