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  • 1
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    IntechOpen | IntechOpen
    Publication Date: 2024-03-07
    Description: Discover the hidden underbelly of organizational behavior in this thought-provoking edited volume, Organizational Behavior - Negative Aspects. Delving into the darker dimensions of the workplace, this book explores the detrimental aspects that impact individuals, teams, and entire organizations. From the elusive "Dark Triad" to counterproductive workplace behaviors and the perils of technostress, a wide range of topics are covered to provide a comprehensive understanding of the challenges organizations face. Fear's crushing impact on organizational culture and the unexplored realms of leadership expectations further challenge conventional notions. The negative aspects of teacher burnout and its profound effects on educational institutions highlight the urgency of addressing this issue. With insightful perspectives and evidence-based recommendations, this collection offers a valuable resource for researchers and practitioners seeking to navigate the complexities of negative organizational behavior. Whether you are a scholar, a manager, or simply curious about the intricacies of organizational dynamics, this book will broaden your understanding and inspire meaningful change. Join us on this journey as we uncover the hidden side of organizational behavior and pave the way towards healthier, more productive workplaces.
    Keywords: Narcissism ; Disabling Structure ; Negative Culture ; Unethical Behavior ; Anxiety ; Stress ; Depression ; Abusive Supervision ; Authoritarian Leadership ; Violence ; Injustice ; Sexual Harassment ; bic Book Industry Communication::J Society & social sciences::JM Psychology::JMJ Occupational & industrial psychology
    Language: English
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  • 2
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    APOLLON University Press
    Publication Date: 2023-03-09
    Description: Ängste, Depressionen, Stress und Burn-out sind Dauerthemen unserer schnelllebigen Gesellschaft. Dabei stellt die psychische Gesundheit mehr als die Abwesenheit von Krankheit dar, denn unsere Lebensqualität beeinflusst unser ganzes Leben. Die mentale Ausgewogenheit kann in Schieflage geraten, sodass dies zusätzlich zu körperlichen Symptomen führen kann. Der Themenband gibt einen umfassenden Einblick in die vielfältigen Einflussfaktoren psychischer Gesundheit. Er stellt unterschiedliche Ansätze zur Stressmessung dar. Darüber hinaus stellt er Möglichkeiten und Grenzen moderner Wege zur Stressbewältigung sowie zielgruppenspezifische Präventionsinterventionen, z. B. über digitale Medien, dar. Dabei wird ein besonderes Augenmerk auf die positive Beeinflussung psychischer Belastungen mithilfe von konstruktiven Lösungsansätzen und Leuchtturmprojekten gelegt. Der Band bietet Verantwortlichen in Gesundheitsinstitutionen, Studierenden, Dozenten und allen Interessierten einen umfassenden und zukunftsweisenden Einblick in das Thema. Zusätzlich zeigt der Themenband auf, wie psychische Gesundheit durch präventive Interventionen wirksam gestärkt werden kann.
    Keywords: Prävention ; Stress ; mentale Gesundheit ; psychisches Wohlbefinden ; Burnout ; bic Book Industry Communication::M Medicine::MB Medicine: general issues::MBN Public health & preventive medicine
    Language: German
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  • 3
    Publication Date: 2022-10-27
    Description: © The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Blagden, M., Harrison, J. L., Minocha, R., Sanders-DeMott, R., Long, S., & Templer, P. H. Climate change influences foliar nutrition and metabolism of red maple (Acer rubrum) trees in a northern hardwood forest. Ecosphere, 13(2), (2022): e03859. https://doi.org/10.1002/ecs2.3859.
    Description: Mean annual air temperatures are projected to increase, while the winter snowpack is expected to shrink in depth and duration for many mid- and high-latitude temperate forest ecosystems over the next several decades. Together, these changes will lead to warmer growing season soil temperatures and an increased frequency of soil freeze–thaw cycles (FTCs) in winter. We took advantage of the Climate Change Across Seasons Experiment (CCASE) at the Hubbard Brook Experimental Forest in the White Mountains of New Hampshire, USA, to determine how these changes in soil temperature affect foliar nitrogen (N) and carbon metabolism of red maple (Acer rubrum) trees in 2015 and 2017. Earlier work from this study revealed a similar increase in foliar N concentrations with growing season soil warming, with or without the occurrence of soil FTCs in winter. However, these changes in soil warming could differentially affect the availability of cellular nutrients, concentrations of primary and secondary metabolites, and the rates of photosynthesis that are all responsive to climate change. We found that foliar concentrations of phosphorus (P), potassium (K), N, spermine (a polyamine), amino acids (alanine, histidine, and phenylalanine), chlorophyll, carotenoids, sucrose, and rates of photosynthesis increased with growing season soil warming. Despite similar concentrations of foliar N with soil warming with and without soil FTCs in winter, winter soil FTCs affected other foliar metabolic responses. The combination of growing season soil warming and winter soil FTCs led to increased concentrations of two polyamines (putrescine and spermine) and amino acids (alanine, proline, aspartic acid, γ-aminobutyric acid, valine, leucine, and isoleucine). Treatment-specific metabolic changes indicated that while responses to growing season warming were more connected to their role as growth modulators, soil warming + FTC treatment-related effects revealed their dual role in growth and stress tolerance. Together, the results of this study demonstrate that growing season soil warming has multiple positive effects on foliar N and cellular metabolism in trees and that some of these foliar responses are further modified by the addition of stress from winter soil FTCs.
    Description: This research was supported by an NSF Long Term Ecological Research (LTER) Grant to Hubbard Brook (NSF 1114804 and 1637685) and an NSF CAREER grant to PHT (NSF DEB1149929). RSD was supported by NSF DGE0947950, a Boston University (BU) Dean's Fellowship, and the BU Program in Biogeoscience. Jamie Harrison was supported by a BU Dean's Fellowship. Megan Blagden was supported by a BU Undergraduate Research Opportunity Program fellowship. This manuscript is a contribution to the Hubbard Brook Ecosystem Study. Hubbard Brook is part of the LTER network, which is supported by the NSF.
    Keywords: Amino acids ; Chlorophyll ; HPLC ; Inorganic nutrients ; Metabolism ; Photosynthesis ; Polyamines ; Soil freeze-thaw cycles ; Soil warming ; Stress ; Sugars
    Repository Name: Woods Hole Open Access Server
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  • 4
    Publication Date: 2022-08-07
    Description: Dada la necesidad de elevar la producción y calidad de las langostas marinas exportables como vivas, producto de su alta demanda y precios altos, resulta necesario realizar esta recopilación bibliográfica que nos permitirá conocer la forma de procesamiento de las diferentes especies de langosta en el mundo. Esta información enfocada a las investigaciones realizadas sobre el estrés y la respuesta, de los ejemplares, al mismo según las especies y algunos resultados obtenidos en Cuba con el mismo fin. Objetivo que se logrará mejorando las condiciones de todo el proceso, para lo cual es necesario realizar investigaciones fisiológicas y tecnológicas para cada especie en cuestión y en las que existan, conociéndose que hay muy poca información sobre la langosta Panulirus argus, por lo que la experiencia adquirida sobre otras especies resulta muy valiosa. Esta recopilación, sobre las investigaciones realizadas sobre esta temática en langostas de diferentes especies y de diferentes condiciones ambientales, permitirá realizar acciones mejor orientadas y más completas, aprovechando así la experiencia y conocimientos adquiridos por otros países del mundo.
    Description: Given the need to increase the production and quality of marine lobsters in the form of live presentation due to their demand and high prices, it is necessary to carry out this bibliographical compilation that will allow us to know the way of processing the different species of lobster in the developed world, information on the research carried out on stress and the response to it according to the species and some results obtained in Cuba. Objective that is achieved by improving the conditions of the entire process for which it is necessary to carry out physiological and technological research specifically for each species in question and in those that exist, knowing that there is very little information about the lobster Panulirus argus, so the experience acquired over other species is very valuable. This compilation, on the investigations carried out on this subject in lobsters of different species and of different environmental conditions, will allow conducting better targeted and more complex investigations, thus being able to take advantage of the experience and knowledge acquired by other countries of the world.
    Description: Published
    Description: Refereed
    Keywords: Estrés ; Langosta espinosa ; Manipulación ; Transporte en vivo ; Stress ; Spiny lobster ; Manipulation ; Alive shipping
    Repository Name: AquaDocs
    Type: Journal Contribution
    Format: pp.42-62
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  • 5
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    The MIT Press | The MIT Press
    Publication Date: 2024-03-24
    Description: An introduction to the the range of current theoretical approaches to the prosody of spoken utterances, with practical applications of those theories. Prosody is an extremely dynamic field, with a rapid pace of theoretical development and a steady expansion of its influence beyond linguistics into such areas as cognitive psychology, neuroscience, computer science, speech technology, and even the medical profession. This book provides a set of concise and accessible introductions to each major theoretical approach to prosody, describing its structure and implementation and its central goals and assumptions as well as its strengths and weaknesses. Most surveys of basic questions in prosody are written from the perspective of a single theoretical framework. This volume offers the only summary of the full range of current theoretical approaches, with practical applications of each theory and critical commentary on selected chapters. The current abundance of theoretical approaches has sometimes led to apparent conflicts that may stem more from terminological differences, or from differing notions of what theories of prosody are meant to achieve, than from actual conceptual disagreement. This volume confronts this pervasive problem head on, by having each chapter address a common set of questions on phonology, meaning, phonetics, typology, psychological status, and transcription. Commentary is added as counterpoint to some chapters, with responses by the chapter authors, giving a taste of current debate in the field. Contributors Amalia Arvaniti, Jonathan Barnes, Mara Breen, Laura C. Dilley, Grzegorz Dogil, Martine Grice, Nina Grønnum, Daniel Hirst, Sun-Ah Jun, Jelena Krivokapic, D. Robert Ladd, Fang Liu, Piet Mertens, Bernd Möbius, Gregor Möhler, Oliver Niebuhr, Francis Nolan, Janet Pierrehumbert, Santitham Prom-on, Antje Schweitzer, Stefanie Shattuck-Hufnagel, Alice Turk, Yi Xu
    Keywords: Prosody ; prosodic theory ; prosodic transcription ; prosodic phonology ; intonation ; phonology-phonetic mapping ; speech timing ; pitch ; prosodic boundaries ; prosodic prominence ; Comparison of scientific theories ; the phoneticsphonology interface ; the Fujisaki model of speech prosody ; Alignment ; scaling ; interpolation ; declination ; ToBI ; pragmatics ; Danish ; Stress ; formal representation ; Melody ; phonetic representation ; surface phonological representation ; underlying phononological representation ; automatic analysis ; phonological transcription system ; ToBI conventions ; strengths of the ToBI system ; weaknesses of the ToBI system ; p-gesture ; Articulatory Phonology ; coupled oscillator model ; speech production ; gradience ; uptalk ; LH accent ; phonetic categories ; pitch stylization ; pitch perception ; tonal annotation ; automatic prosodic labeling ; pitch range normalization ; Kiel Intonation Model ; German ; contour ; prominence levels ; emphatic accents ; British School ; kinetic tones ; autosegmental-metrical ; F0 parametrization ; GToBI ; exemplar-theoretic intonation ; phonetic implementation of pitch accents ; Pitch target ; prosopheme ; parallel encoding ; target approximation ; communicative function ; thema EDItEUR::C Language and Linguistics::CF Linguistics::CFH Phonetics, phonology ; thema EDItEUR::C Language and Linguistics::CF Linguistics::CFM Lexicography ; thema EDItEUR::J Society and Social Sciences::JM Psychology::JMT Psychology: states of consciousness
    Language: English
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  • 6
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    In:  http://aquaticcommons.org/id/eprint/22048 | 18721 | 2018-01-25 08:41:43 | 22048 | Iranian Fisheries Science Research Institute
    Publication Date: 2021-07-07
    Description: The present study conducted to investigate the effect of cortisol injection on growth indices, food intake and plasma cortisol in juvenile common carp (Cyprinus carpio). After 2 weeks adaptation, 240 fish with 19.5 ± 0.2 g average weight were randomly distributed in to 12 fiberglass tanks with four treatments and three replicates (20 fish per tank). Based on body weight, cortisol (mixed with oil) was injected to treatments with different dosages at 0 (C0), 1 (C1) and 10 (C10) µg/g. At the end of 21 days, fish were weighed and growth parameters showed significant reduction in C10. No significant change was observed in hepatosomatic index among different treatments. Food intake were recorded daily during the experiment and showed significant reduction in days 1 to 8, 16 and 19 in C10 compared to control group . Blood was taken to determine plasma cortisol at the start, day 3, day 7 and day 21 of the experiment. Cortisol concentrations showed significant reduction in C10 compared to C0 group three days after the initiation of the experiment. The results showed that increasing of cortisol in a short time after injection, affected by changes of blood plasma cortisol and reduction of food intake could negatively have an effect on growth.
    Keywords: Aquaculture ; Biology ; Chemistry ; Cortisol ; Stress ; Appetite ; Liver ; Common carp ; Cyprinus carpio ; plasma ; food ; growth ; juvenile ; blood ; Iran
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  • 7
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    In:  http://aquaticcommons.org/id/eprint/22064 | 18721 | 2018-02-01 08:51:49 | 22064 | Iranian Fisheries Science Research Institute
    Publication Date: 2021-07-07
    Description: This study was conducted to investigate the effects of different levels of sangrovit (0, 0.05, 0.1 and 0.15 %) on growth, some of blood biochemical parameters, survival and salinity tolerance capacity in Cyprinus carpio (2.62±0.117 gr). After 45 days of feeding, results showed that growth performance including of weight gain and % specific growth rate improved which fish fed whit sangrovit compared with to control group, but there was no significant differences in growth parameters which fish fed with herbal supplement compared to control group (P〉0.05). There were significant differences in biochemical parameters in fish fed with sangrovit compared to the control group (P〈0.05). The lowest level of cholesterol was observed in 0.05 % group and the highest level of total protein was observed in 0.15 % group. The highest levels of glucose observed in control treatment. In order to determine the effect of the herbal supplement on resistance to salinity stress, salinity stress was carried out after 45 days of feeding. Blood samples were obtained at 24, 72, 120 and 168 hours after stress. Hematocrit had significant difference in each groups (P〈0.05). On the third day after stress, hematocrit levels were decreased in all treatments. Survival and tolerance to salinity stress challenge remained unaffected by dietary supplementation of sangrovit. The results of this study showed that addition of sangrovit to fish diet can improve growth performance and blood biochemical parameters of common carp fingerlings.
    Keywords: Aquaculture ; Chemistry ; Growth ; performance ; Blood ; Sangrovit ; Stress ; Common carp ; Cyprinus carpio ; fingerlings ; biochemical ; parameters ; survival ; resistance ; growth ; fish ; fed ; Iran
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  • 8
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    In:  http://aquaticcommons.org/id/eprint/22514 | 18721 | 2018-04-16 21:18:16 | 22514 | Iranian Fisheries Science Research Institute
    Publication Date: 2021-07-06
    Description: In this study, the malondialdehyde (MDA) levels in the muscle, liver and kidney tissues and the antioxidant vitamin (A, C, E) levels in the muscle tissue of juvenile rainbow trout were investigated under different oxygen levels (3.5 mg O2/l, 4.5 mg O2/l and 7 mg O2/l) at the end of the 8 hour trial. Fish (initial weight and length, 30.19±2.2 g and 13.15±0.22 cm, respectively) were distributed into 9 fiberglass rectangular tanks. The highest MDA level of all tissues was obtained in 3.5 mg O2/l (p〈0.05). Different oxygen levels did not affect muscle vitamin A concentration statically (p〉0.05). But the highest muscle vitamin C and E concentrations were obtained in 7 mg O2/l (p〈0.05), followed by 3.5 mg O2/l, while the lowest muscle vitamin C concentration was obtained in 4.5 mg O2/l (p〈0.05).
    Keywords: Aquaculture ; Biology ; Environment ; Fisheries ; Rainbow trout ; Hypoxia ; Stress ; Antioxidant vitamins ; Lipid peroxidation ; Tissue ; Turkey
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  • 9
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    In:  http://aquaticcommons.org/id/eprint/22969 | 18721 | 2018-06-08 20:56:36 | 22969 | Iranian Fisheries Science Research Institute
    Publication Date: 2021-07-12
    Description: The present exposition was designed to evaluate blood serum changes in tiger grouper, Epinephelus fuscoguttatus in response to changes in water temperature and salinity. Uniformly sized fingerlings were randomly distributed into different groups at fifteen fish per tank, in two replicates. Each group represented experimental fishes subjected to water temperatures of 18, 24, 28 and 30°C (control), and salinity of 10, 20 and 30 (control) ppt respectively. Replicate groups of fishes in each tank were exposed to these physiological stressors for 4 and 36 hours. At the end of experiment, blood samples were collected via caudal vein. The collected blood was centrifuged to obtain serum, and analyzed for cortisol and glucose concentrations, using ELISA method. Results showed that decrease (to 28, 24 and 18°C) in water temperature from the control (30°C) and salinity from 30 ppt to 20 and 10 ppt for 4 and 36 hours influenced changes in the physical appearances (skin coloration) and behaviors (swimming vigor, opercula movement and schooling) of fish, to suggest responses to stress. Further, analyses of serum cortisol revealed consistently higher concentrations at the lower temperatures tested (to 28, 24 and 18°C), than the optimum tolerated by the species. Interestingly, fish maintained at 28°C for 36 hours contained lower serum cortisol concentrations compared to control groups. Meanwhile, the increment of the serum cortisol concentration occurs at decreased water salinity from 30 ppt to 20 and 10 ppt for 4 and 36 hours. It is concluded that: 1) water temperature and salinity are important physiological stressors; 2) sudden alteration of these factors leads to stress, and should therefore be avoided or minimized; 3) results of the present trial suggest that the blood serum factors are reliable parameters for evaluating the level of stress in fish.
    Keywords: Aquaculture ; Biology ; Fisheries ; Epinephelus fuscoguttatus ; Temperature and salinity change ; Cortisol concentration ; Behavior ; Stress ; aquaculture ; Malaysia
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  • 10
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    In:  http://aquaticcommons.org/id/eprint/25934 | 18721 | 2018-11-22 07:20:09 | 25934 | Khorramshahr University of Marine Science and Technology
    Publication Date: 2021-07-16
    Description: Chronic stresses can influence the behavioral and physiological activities of animals and can lead to reduction of resistance against disease and decrease in growth rate and production.Artemianauplii enriched with essential nutrients particularly fatty acids have been used to promote growth, survival and resistance of different species of aquatic animals to various environmental stresses as well as infectious diseases. In this study we investigated the resistance to environmental stress (temperature, salinity and hypoxi) in larvae of rainbow trout fed Artemianauplii enriched with vegetable oils. The experiment was carried out in 6 triplicate treatments for a period of 10 days. The feeding treatments included: 1) commercial starter feed for trout (Control) 2) Artemianauplii enriched with fish oil, 3) Artemianauplii enriched with sunflower oil, 4) Artemianauplii enriched with canola oil, 5) Artemianauplii enriched with soybean oil and 6) newly hatched nauplli of Artemia. The results showed significant differences in tolerance of fish larvae to high temperature (20 and 25°C), hypoxia stress (5 ppm) and salinity stress (10, 15 and 20 mg.l-1) among different groups. Highest survival to all experimental stresses (except in one case) was observed in larvae fed Artemianauplii enriched with canola oil compared to those fed control diet ( p〈0.05), but in most cases not significant with larvae fed Artemianauplii enriched with fish oil.
    Keywords: Aquaculture ; Iran ; Feeding ; Rainbow Trout ; Larvae ; Oncorhynchus Mykiss ; Artemianauplii ; Oil ; Resistance ; Temperature ; Salinity ; Stress ; Diet
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  • 11
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    In:  http://aquaticcommons.org/id/eprint/21908 | 18721 | 2018-01-15 10:28:52 | 21908 | Iranian Fisheries Science Research Institute
    Publication Date: 2021-07-04
    Description: Salinity tolerance in Persian sturgeon larvae (Acipenser persicus) fed with enriched Artemia urmiana nauplii were investigated when exposed to different salinity. For this purpose, cyst of Artemia urmiana hatched and enriched with a commercial emulsion, ICES30/4 supplemented with three levels of vitamin C (10, 20 and 30%) each with 3 replications according to standard condition and fed to Persian sturgeon larvae during 20 experimental days. At the end of this period, total length, weight, lipid, unsaturated fatty acids contents and vitamin C in fish larvae were measured. Fish larvae were exposed to 6, 12 and 18ppt salinity, and salinity tolerance were surveyed after 120h. The results showed that survival percentage as salinity tolerance indicator increased compared to control group that are larvae fed un-enriched Artemia nauplii. ICES40/3 with 20% vitamin C led to the highest salinity tolerance at 12ppt in Persian sturgeon larvae (99±1) but in 18ppt all larvae were died. The increase in salinity tolerance is likely due to omega 3 and 6 increase in fish larvae fed with Artemia enriched with ICES30/4.
    Keywords: Aquaculture ; Biology ; Nutrition ; Stress ; Sturgeon fish ; larvae ; vitamin C ; HUFA ; Iran ; Acipenser persicus
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  • 12
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    In:  http://aquaticcommons.org/id/eprint/22226 | 18721 | 2018-02-24 15:34:50 | 22226 | Iranian Fisheries Science Research Institute
    Publication Date: 2021-06-30
    Description: The study on the ecophysiological impacts of stress in female Persian sturgeon broodfishes revealed that the average cortisol level varried in all broodfish caught at the Sefidrud River (163.38±21.2ng mL-1), Sefidrud River estuary (260.27±19.7ng mL-1) and Gorganrud River estuary (179.38±20.8ng mL-1). The variations in serum glucose levels were 140.65±12.05mg dL-1, 144.44±5.9mg dL-1 and 126.24±11mg dL-1, respectively. The maximum level of cortisol (781 ng mL-1) and serum glucose (281 mg dL-1) were observed during the transport of broodfish from the capture stations to the hatcheries and the minimum level of cortisol (25.2 ng mL-1) and serum glucose (33 mg dL-1) were observed during the confinement of broodfishes in the breeding ponds. The rhythmic and significant variations of cortisol level during capture, handling, transport and confinement of female Persian sturgeon broodfish in all three regions can be regarded as a valuable indicator of stress
    Keywords: Aquaculture ; Biology ; Stress ; Cortisol ; Glucose ; Acipenser persicus ; Broodfish ; Iran
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  • 13
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    In:  http://aquaticcommons.org/id/eprint/22293 | 18721 | 2018-03-13 20:10:35 | 22293 | Iranian Fisheries Science Research Institute
    Publication Date: 2021-07-02
    Description: Apoptosis is a programmed cell death that has been attributed to the action of stress hormones, such as cortisol. We investigated the in vitro effect of cortisol in goldfish (Carassius auratus) mature (GSI: 2.75-4.65) or immature (GSI: 1.94-2.4) testes. Testes were taken out and transferred into culture medium (M 199), cut into 20 micron thick slices and supplemented with fetal bovine serum (FBS), added different doses of cortisol (0, 50, 100, 200, 400, 750 and 800 ng/ml) and incubated for 24h, 48h or 72h at 18°C. Samples were rinsed and homogenized with phosphate buffered saline (PBS) after incubation period. Duplicates or triplicates processed for caspase-3 activity. The results showed a significant increase in caspase-3 activity in immature testes after 72h treatment with 750ng/ml of cortisol (P〈0.05), and also at 400ng/ml (P〈0.05). In contrast, no significant differences were observed between non-treated and cortisol-treated samples from mature goldfish testes. In this study we have demonstrated, for the first time that the stress hormone cortisol induces apoptosis in the goldfish testis in a stage-specific manner (immature testis).
    Keywords: Biology ; Fisheries ; Apoptosis ; Caspase 3 ; Cortisol ; Goldfish ; Stress ; Testis ; Carassius auratus
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  • 14
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    In:  http://aquaticcommons.org/id/eprint/22393 | 18721 | 2018-04-03 13:18:36 | 22393 | Iranian Fisheries Science Research Institute
    Publication Date: 2021-07-04
    Description: Gravid wild kutum broodstock, Rutilus frisii kutum, on their upstream migration to Valiabad River (northern Iran) were kept in captivity to allow them to ovulate (captive ripe). Then the impact of captivity on some reproductive and physiological parameters (i.e., plasma cortisol and glucose levels, fertilization percentage, gonadosomatic index and fecundity) were assessed and results were compared with those obtained from naturally ovulated broodstock (ripe). Plasma cortisol level was not significantly different between gravid and captive ripe broodstock but was significantly higher (P〈0.05) than that in ripe group. Glucose level was significantly higher (P〈0.05) in captive ripe compared to that in ripe or gravid groups. Mean gonadosomatic index, fecundity, and fertilization rate did not affect as a result of stress by captivity. Inverse relationship between plasma cortisol levels and fertilization rate was observed.
    Keywords: Biology ; Fisheries ; Captivity ; Cortisol ; Fertilization rate ; Glucose ; Stress ; Kutum ; Iran
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  • 15
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    In:  http://aquaticcommons.org/id/eprint/23865 | 18721 | 2018-08-01 05:13:19 | 23865 | Iranian Fisheries Science Research Institute
    Publication Date: 2021-07-15
    Description: This study was conducted to investigate the effects of rotifers enriched with betaine and concentrated diet containing betaine on growth performance, survival and resistance to salinity (10 and 5Oppt), temperature (42°C) and formalin (100ppm) stresses in Indian white prawn (Fenneropenaeus indicus) post-larvae. A complete randomized design with three replicates per treatment in nine 20-1 tanks was chosen. Treatments were: Artemia nauplii, rotifers and concentrated diet (control); Artemia nauplii, rotifers enriched with betaine and concentrated diet (treatment 1) and Artemia nauplii, rotifers enriched with betaine and concentrated diet containing betaine (0.8%) (treatment 2). The larvae were fed 6 times per day at 4h intervals. There were significant differences in growth and survival rate between the treatments containing betaine (treatment 1 and 2) and control treatment (P〈0.05). Furthermore, the larvae that were fed with betaine (treatment 1 and 2) had significantly higher survival rate in stress resistance testes (P〈0.05). The present study showed that betaine has positive effect on growth performance, survival rate and resistance to stresses in Indian white prawn.
    Keywords: Aquaculture ; Rotifer ; Feeding ; Stress ; Artemia ; Iran
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    In:  http://aquaticcommons.org/id/eprint/23950 | 18721 | 2018-08-02 11:13:36 | 23950 | Iranian Fisheries Science Research Institute
    Publication Date: 2021-07-15
    Description: Chronic and acute effects of stress on the reproductive system and hormonal balance in higher vertebrates is well documented, but the subject is little investigated on fish. Understanding the courses of stress to eliminate or minimize them, will contribute to designing culture systems, or methods, based on the physiological requirements of fish. This will consequently enhance production of cultured fish. This study has investigated the effects of stress as a result of handling and induced spawning through injection of HCG (1100 IU/kg), GnRH (2 Ug/kg), dopamine antagonist (25 mg/kg) and distilled water (0.5 cc/kg). Taking into consideration that the secretion of cortisol is the first response to stress, therefor the level of cortisol in the blood of injected fish (rainbow trout spawners) was compared by using Radio Immuno-Assay technic. In three treatments cortisol level of blood after 10, 15, 20, 25, 30 and 35 minutes after stress was measured. The present study showed a significant increase in the level of cortisol in the blood of fish compared to uninjected control treatment. This increase was caused by stress related to handling and spawning. There were no highly significant difference (P 〈 0.01) in the cortisol level among the fish injected with HCG, GnRH and dopamine antagonist. The type of injecting material does not make a difference in the amount of stress and cortisol level. This research has concluded that handling and injection make a significant stress for the spawning fish. It is recommended to use ecological factors to persuade natural spawning without disturbance and injections.
    Keywords: Biology ; Cortisol ; Hormone ; Rainbow trout ; Chronic effect ; Stress ; Hormonal balance ; Vertebrates ; Fish ; Culture system ; Spawning ; Injection ; HCG ; Dopamine antagonist ; Distilled water ; Blood ; Physiological ; Ecological ; Iran
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  • 17
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    In:  http://aquaticcommons.org/id/eprint/24889 | 18721 | 2018-11-22 07:11:39 | 24889 | Khorramshahr University of Marine Science and Technology
    Publication Date: 2021-07-16
    Description: Water and electrolyte balance is vital for aquatic organisms in both hyper and hypo osmotic environments. Kidneys as excretory organs play an important role in osmoregulation and body fluid homeostasis. In this study a total number of 180 Sobayti (Teleost: Sparidentex hasta) were exposed to different salinities to assess changes in the kidney structure and alterations in plasma levels of electrolytes, glucose and cortisol. Salinity challenges were examined for a period of 14 days in four experimental groups: 40ppt as control and 5, 20 and 60 ppt as other experimental treatments. 24 hours after salinity challenge, significant changes were observed in the lumen diameter of the primary proximal tubule at the sections from trunk kidney in both 5 and 20 ppt conditions (P〈0.05). Lumen diameter of the second part of the proximal tubule did not differ in any of the experimental salinities (P〉0.05).However, lumen diameter of the distal tubule of nephron in the trunk kidney, increased significantly in 60 ppt treatment 48 hours from starting the experiment (P〈0.05). The thickness of the epithelium tubule in both trunk and tail parts showed no significant differences during the adaptations (P〉0.05). According to the results, histomorphological changes in the different parts of the kidney returned to the basic structure with in 24 to 48hours after exposure to different salinities.
    Keywords: Biology ; Osmoregulation ; Kidney ; Stress ; Sparidentex hasta ; Environmental ; Iran
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  • 18
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    In:  http://aquaticcommons.org/id/eprint/24885 | 18721 | 2018-11-22 07:10:40 | 24885 | Khorramshahr University of Marine Science and Technology
    Publication Date: 2021-07-16
    Description: The present study carried out to assess the effects of Benzo-α-Pyrene (BaP) as a serious member of Polycyclic Aromatic Hydrocarbons (PAH) on the plasma levels of cortisol and triiodothyronine (T3) hormones in male Seabream, Acanthopagrus latus (Sparidea). To assess the acute effects of BaP on the endocrine system, a group of fish was injected with dissolved BaP in sunflower oil (50mg/kg BaP in 2µg/l oil according to the body weight). Other fishes were injected with 2µg/l body weight as controls. Blood samples from both groups collected 3 hours after injection. In another protocol, the chronic effects of BaP on the plasma levels of cortisol and T3 were assessed. For this reason a group of fish was implanted with 50mg/kg BaP in 10µl/g coconut oil in respect to each fish body weight. As the previous protocol a control group was implanted with the same amount of oil without the BaP. Blood samples collected from both implanted groups (treatment and control) after 72 hours. According to the results, plasma levels of cortisol in yellowfin Seabream increased during both short time and long time exposure but T3 levels in the plasma decreased during the chronic stress of BaP exposure. It seems the cortisol levels are elevating to provide more energy requirement under the acute and chronic stress conditions by direct effect on glyconeogenesis and fast blood sugar level to be consumed by cells. T3 levels may be affected by inhibitory effect of Aryl hydrocarbon receptors (AhRs) which decreased it during long term exposure.
    Keywords: Biology ; Pollution ; Testosterone ; Cortisol ; Reproductive physiology ; Stress ; Polycyclic Aromatic Hydrocarbon ; Plasma ; Spermatogenesis ; Hormone ; Yellowfin Seabream ; Acanthopagrus latus ; Iran
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  • 19
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    In:  http://aquaticcommons.org/id/eprint/24881 | 18721 | 2018-11-22 07:09:39 | 24881 | Khorramshahr University of Marine Science and Technology
    Publication Date: 2021-07-16
    Description: One of the most striking phenomena in the Caspian Sea is the sea level rise. Sea level fluctuation is due to climatologically changes, regional precipitation, water evaporation, temperature, wind stresses, surges and geomorphology changes in the sea bed, alteration in atmospheric transport pattern as well as human activities such as construction of dams on the major rivers. More meteorological studies of Caspian Sea region as well as advanced watershed and ocean modeling must be used in order to predict the sea level fluctuation with acceptable results. In this research the variation of evaporation and precipitation in five coastal stations of south Caspian Sea from 1993 to 2008 has been studied and determines what are the effects of precipitation and evaporation in Caspian Sea fluctuation during this pried. The mean calculated evaporation in this period is about 922.9 mm. It is less than the mean calculated evaporation for long term period that is about 1007 millimeter/year. Mean calculated precipitation in this period is about 1292.6 mm. It is higher than mean calculated precipitation for long term period that is about 1221 millimeter/year. So in southern Caspian Sea, the increase of precipitation and the decrease of evaporation have an important role in sea level rise in recent years. The statistical index and correlation between atmospheric parameters are also determined and discussed in this research.
    Keywords: Atmospheric Sciences ; Sea Level Fluctuation ; Evaporation ; Precipitation ; Temperature ; Stress ; Parameters ; Atmospheric ; Caspian Sea ; Iran
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  • 20
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    In:  http://aquaticcommons.org/id/eprint/25011 | 18721 | 2018-11-17 18:31:33 | 25011 | Khorramshahr University of Marine Science and Technology
    Publication Date: 2021-07-16
    Description: Impact of anesthesia with electric shock on some of physiological parameters was studied in in Acipenser nudiventris in this study, we investigated the induction and recovery times and physiological response of Acipenser nudiventris. We anesthetized them by CO2 (mmhg), clove powder (mg/L), and electric shock (V). Shortest and longest induction time were 0.15 min and 4.25 min when electric shock and clove powder were used. On the other hand, shortest and longest time of recovery time were 3.23 min and 2. 20 min respectively when electric shock and CO2 gas were used. Cortisol and glucose levels increased 1 and 6 hours after anesthesia. Changes in plasma osmolality were less among the anesthesia treatments. Results demonstrated that electric shock was a more effective method for quick induction time, although all anesthetic methods were found to be safe.
    Keywords: Biology ; Iran ; Anesthesia ; Acipenser nudiventris ; Stress ; Biochemical indices ; Parameters
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  • 21
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    In:  http://aquaticcommons.org/id/eprint/25010 | 18721 | 2018-11-17 18:23:15 | 25010 | Khorramshahr University of Marine Science and Technology
    Publication Date: 2021-07-16
    Description: This study was conducted to evaluate the effect of the chitosan diet on the intestinal histology, body composition and resistance towards salinity and thermal stresses in Caspian kutum (Rutilus frisii kutum) fingerlings. This research, using a completely random design, consisted of 0.25, 0.5, 1, and 2 g levels of chitosan per kg for each commercial diet of the Caspian kutum in three repetitions. The Kutum fingerlings, with an average weight of 1.76 ± 0.15 g, were fed with the experimental diets for 8 weeks. At the end of the experiment, tissue sections were prepared by cutting 5mm-thick samples from the intestines of the fish. To evaluate the resistance to salinity and thermal stresses, the fingerlings were exposed to a salinity stress of 11 ppt and 13 ppt and temperatures of 30 °C and 34 °C, after which the survival rate was calculated. Microscopic observations showed that the intestinal villi height in the fish fed with the diet containing 1 g kg-1 of chitosan significantly increased to 319.93 µm compared to the control group (P〈0.05). The biochemical analysis of body composition had not significant difference throughout the groups (P〉0.05). Fish survival rate after 11 ppt and 13 ppt salinity stress showed no statistically significant difference (P〉0.05), but the survival rate of the fish fed with the diet containing 1g kg1 of chitosan after experiencing the 34 °C thermal stress significantly increased to 70% (P〈0.05). The results suggest that a chitosan level of 1g kg-1 in the diet can not only affect the survival rate and resistance of kutum fingerlings against thermal stress, but can also affect the height of the intestinal villi.
    Keywords: Biology ; Iran ; Chitosan ; Diet ; Histology ; Body composition ; Salinity ; Stress ; Caspian Kutum ; Rutilus frisii kutum ; Fingerlings ; Intestinal histology
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  • 22
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    In:  http://aquaticcommons.org/id/eprint/25942 | 18721 | 2018-11-22 07:22:02 | 25942 | Khorramshahr University of Marine Science and Technology
    Publication Date: 2021-07-16
    Description: The present study carried out to assess the effects of Benzo-α-Pyren (BaP) as a serious member of Polycyclic Aromatic Hydrocarbons (PAH) on the plasma levels of cortisol and triiodothyronine (T3) hormones in male Seabream, Acanthopagrus latus (Sparidea). To assess the acute effects of BaP on the endocrine system, a group of fish was injected with dissolved BaP in sunflower oil (50mg/kg BaP in 2µg/l oil according to the body weight). Other fishes were injected with 2µg/l body weight as controls. Blood samples from both groups collected 3 hours after injection. In another protocol, the chronic effects of BaP on the plasma levels of cortisol and T_3 were assessed. For this reason a group of fish was implanted with 50mg/kg BaP in 10µl/g coconut oil in respect to each fish body weight. As the previous protocol a control group was implanted with the same amount of oil without the BaP. Blood samples collected from both implanted groups (treatment and control) after 72 hours. According to the results, plasma levels of cortisol in yellowfin Seabream increased during both short time and long time exposure but T_3 levels in the plasma decreased during the chronic stress of BaP exposure. It seems the cortisol levels are elevating to provide more energy requirement under the acute and chronic stress conditions by direct effect on glyconeogenesis and fast blood sugar level to be consumed by cells. T_3 levels may be affected by inhibitory effect of Aryl hydrocarbon receptors (AhRs) which decreased it during long term exposure.
    Keywords: Biology ; Pollution ; Iran ; Endocrine ; Benzo-α-Pyren ; BaP ; Stress ; Yellowfin Seabream ; Acanthopagrus latus ; Sparidea
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  • 23
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    In:  http://aquaticcommons.org/id/eprint/25998 | 18721 | 2018-10-19 17:52:04 | 25998 | Iranian Fisheries Science Research Institute
    Publication Date: 2021-07-24
    Description: This study aimed to elucidate the influence of environment pH on survival, growth, energy allocation and oxidative damage of juvenile Scophthalmus maximus (19.89±0.25 g). Six pH treatments (6.3±0.2, 6.8±0.2, 7.3±0.2, 7.8±0.2, 8.3±0.2, 8.8±0.2) lasting for eight weeks were included. Measurements of survival (SR), feed conversion ratio (FCR), specific growth rate (SGR), weight gain rate (WGR), energy allocation, liver superoxide dismutase activity (SOD), catalase activity (CAT), and malondialdehyde concentration (MDA) were done. Results show that SR did not vary from pH 6.3 to 7.8, but reduced then significantly (p〈0.05); FCR rose remarkably (p〈0.05) while SGR and WGR decreased pronouncedly (p〈0.05). Most of the food energy was used in metabolism, followed by growth, feces loss and nitrogenous excretion. Energy deposited for growth showed a decreasing tendency when pH rose; while for metabolism showed a reverse trend. SOD showed insignificant difference from pH 6.3 to 7.8, but the activities then elevated obviously (p〈0.05) though a slight decrease was found from pH 8.3 to 8.8 (p〉0.05). CAT kept stable between pH 6.3 and 7.3, then sharply increased (p〈0.05), but no significant differences were found between pH 8.3 and 8.8 (p〉0.05). Subsequent decrease in MDA was found from pH 6.3 to 8.3 then the concentration smoothly increased. Overall, our results indicate that a pH in the range of 6.8 to 7.8 is recommended in the growth environment in cultivation of juvenile turbot.
    Keywords: Aquaculture ; China ; Juvenile turbot ; Scophthalmus maximus ; pH ; Water ; Survival ; Growth ; Energy allocation ; Oxidative SODdamage ; Stress ; Parameters ; FCR ; SGR ; WGR ; CAT
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  • 24
    Publication Date: 2022-01-31
    Description: Since Hans Selye's seminal work in the 1930s, there have been numerous advances with respect to our understanding of how the nervous and endocrine systems interact to help animals cope with stressors and how chronic stress may adversely impact health. Our modern understanding of stress essentially began in 1954 with the race to discover the hypothalamic releasing factor controlling ACTH secretion and mediating the endocrine response to stressors. Since the isolation of corticotropin releasing factor (CRF) in 1981, interest in CRF has focused not only on its hypophysiotropic function, but also its much broader role in coordinating many of the endocrine, behavioral and autonomic nervous system changes that occur during stress. The goal of this Research Topic is to solicit reviews and general research articles highlighting new research into stress and the hypothalamus-pituitary-adrenal (HPA) axis in the following areas: HPA axis interaction with energy regulating mechanisms during stress; and new studies on the role of CRF and urocortin and urocortins 2 and 3 in behavioral adaptation to stressors.
    Keywords: RC648-665 ; R5-920 ; RC321-571 ; Q1-390 ; peptide ; energy balance ; evolution ; Stress ; food intake
    Language: English
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  • 25
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    Frontiers Media SA
    Publication Date: 2023-12-21
    Description: Vasopressin and its homologues are evolutionarily ancient neuropeptides that are important to the neural modulation of behavior in many species. Over the last several decades there has been an emergence of cross-species consensus with regards to the broad behavioral domains that the vasopressin system influences. However, there are nuanced species- and sex-differences in the functions of this system, as well as evidence for cross-talk between this system and the oxytocin system. For this Research Topic, reviews and research articles from investigators across the field were solicited, with the goal to highlight some of the complexity and diversity within this system. This collection challenges researchers to broaden their understanding of this system as well as identifies areas in which additional research is needed. Topic areas featured include: - System complexity - Sex and species differences - Developmental effects - Human and non-human primates.
    Keywords: R5-920 ; RC648-665 ; RC321-571 ; Q1-390 ; Social ; Intranasal ; Vasotocin ; Social memory ; Vasopressin ; Stress ; Communication ; bic Book Industry Communication::M Medicine
    Language: English
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  • 26
    Publication Date: 2022-01-31
    Description: Sie leiten eine Schule? Sie verstehen Schulentwicklung als zentrale Aufgabe? Dann lesen Sie dieses Buch. Holen Sie sich Rückenwind. Bauen Sie sich ein Leitungsteam, das die Schule auf Kurs bringt. Alle Lehrkräfte werden gebraucht. Wie lassen die sich gewinnen? Wie können Sie das Schiff Schule durch Meinungsstreit, Konflikte und Stress so steuern, dass alle dabei lernen? In fünf Schritten: Fangen Sie mit sich selbst an, erwerben Sie als Kapitänin bzw. Kapitän persönliche Meisterschaft. Fördern Sie die Crew, mit Teamlernen. Schärfen Sie Ihr Radarsystem für innere Blockaden, für die Macht mentaler Modelle, bremsende und beflügelnde. Blicken Sie auf Ihre Schule als Ganzes, wie eine Möwe aufs Schiff: Systemdenken. Klären Sie miteinander Ihre Vision: Wohin soll die Reise gehen? So wird Ihre Schule eine Lernende Organisation, mit Rückenwind. Der Weg dahin wird hier praxisnah beschrieben.
    Keywords: LC8-6691 ; LB5-3640 ; Lernende Organisation ; Burnout ; erweiterte Schulleitung ; Gewaltfreie Kommunikation ; Schulleitung ; Schulentwicklung ; Arbeitsfähigkeit ; Schulleiter ; Konferenzstruktur ; transaktionsanalytisch ; Ursprungsmodell ; Feedback ; Überlastungsreaktion ; Leitungsteam ; partizipativ-verbindliches Leitungskonzept ; Teamlernen ; Vertragsarbeit ; Überlastung ; Schulleiterin ; Arbeitsleistung ; Schulalltag ; rechtliche Rahmenbedingungen ; Stressregulation ; Leitungsrolle ; Vulnerabilitäts-Stress-Modell ; Stress ; Schule ; Teamstärkung ; Konflikt ; kollegiale Beratung ; zuhören ; Förderung ; Lerninteressen
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  • 27
    Publication Date: 2024-04-05
    Description: Ethanol, the main psychopharmacologically active ingredient of alcoholic drinks, represents a paradigmatic example of a research subject intrinsically able to perpetually self-generate interdisciplinary cutting-edge investigations. This eBook was inspired by the aim of providing an up-to-date characterization of the diverse effects of ethanol, of the possible mechanisms of action on different intracellular systems as well as of the hypothesized actions of ethanol and/or its metabolites on various neurotransmitters and neuromodulators. Indeed, the eBook provides a factual example of an excellent synthesis on the complex relationship between ethanol and its main biologically active metabolites (Chapter 1), on the behavioral and molecular consequences of early exposure to them (Chapter 2), on the recent proposals, advanced by the preclinical research, for new therapeutic approaches to distinct aspects of alcoholism (Chapter 3) and on the most recent and original preclinical evidence of the interactions between ethanol and/or its metabolites and the dopaminergic, adenosinergic and endocannabinoidergic systems (Chapter 4). Overall we believe that this eBook accomplishes its main goals of widening the perspective on this research subject and offering the readership a newer and, simultaneously, up-to-date and comprehensive scenery on ethanol’s and ethanol's active metabolites neurophysiological and behavioral effects.
    Keywords: RC321-571 ; Q1-390 ; UchB ; Prenatal-exposure ; Self-administration ; Salsolinol ; Motivation ; Ehanol ; Stress ; Acetaldehyde ; Caffeine ; Nicotine ; thema EDItEUR::P Mathematics and Science::PS Biology, life sciences::PSA Life sciences: general issues::PSAN Neurosciences
    Language: English
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  • 28
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    Language Science Press | Language Science Press
    Publication Date: 2024-03-24
    Description: This book provides a quantifiable measure and analysis of absolute complexity in the nominal inflection of 17 Alemannic dialects, of standard German as well as of Middle and Old High German. The data is based on grammatical descriptions. What can be interpreted as being more or less complex in a language system is deduced from LFG (Lexical-Functional Grammar) and from an inferential-realisational morphological framework. The tool to measure inflectional complexity is also developed from these frameworks. Variation in the inflectional complexity is analysed based on the following factors: diachrony, isolation, language contact, standardisation, and dialect groups.
    Keywords: lfg ; alemannic dialects ; inferential-realisational morphological framework ; quantitative linguistics ; nominal inflection ; absolute complexity ; Artikel (Wortart) ; Flexion ; Genus ; Komplexität ; Paradigma ; Personalpronomen ; Plural ; Possessiv ; Stress ; thema EDItEUR::C Language and Linguistics::CF Linguistics
    Language: German
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  • 29
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    MDPI - Multidisciplinary Digital Publishing Institute
    Publication Date: 2024-04-05
    Description: Through evolution of life, animals have adapted to the ubiquitous presence of metals in the biosphere. They utilize the more frequent ones as essential constituents of their biochemical machinery. In fact, about 40% of all proteins present in animal cells are so-called metalloproteins. On the other hand, animals have invented regulatory and detoxifying mechanisms to protect themselves from critical concentrations of both essential and non-essential metal concentrations. Metallomics is a modern approach applying cellular, biochemical, molecular and analytical methods to investigate the relationships of metals in their cellular context. The present edition contains a number of original articles and reviews dealing with various aspects of metallomics in animals, published as Special Issues of the International Journal of Molecular Sciences in 2016 and 2017. The book addresses subjects such as metal definition in biology, metabolism of metals in invertebrate and vertebrate animals, metal detoxification and regulation strategies, supplementation of essential trace elements, metal behavior in pregnancy and embryonic development, as well as metal toxicology and emerging medical implications.
    Keywords: QH301-705.5 ; Allergy ; Protein Biochemistry ; Oxidative Stress ; Metalloprotein ; Homeostasis ; Metal Uptake ; Iron ; Metal ; Synthase ; Immunity ; Accumulation ; Model Organism ; Methylmercury ; Development ; Metal Toxicity ; Essential Trace Element ; Copper ; Protection ; Molecular Methods ; Metal Supplementation ; Binding Specificity ; Cadmium ; Transgenic Organisms ; T Cells ; Non-Essential Trace Element ; Animal Model ; Hypersensitivity ; Detoxification ; Tolerance ; Histology ; Palladium ; Metalloenzyme ; Stress ; Zinc ; Regulation ; Nickel ; Protein Disease ; Mercury ; Phytochelatin ; Metallothionein ; Apoptosis ; Cancer ; thema EDItEUR::P Mathematics and Science::PS Biology, life sciences
    Language: English
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  • 30
    Publication Date: 2021-05-19
    Description: Eriocheir sinensis, which is an important aquaculture species, belongs to the class Crustacea. To discuss the temperature tolerance of E. sinensis, the survival rates of juvenile crabs of E. sinensis were determined in this paper using a series of temperature settings (normal temperature, 25°C, 30°C, 32°C, 34°C, 35°C, 36°C, 38°C, 40 °C). The results indicated that except the normal temperature level, mortality rate almost reached 100% at other temperatures. The time of death of all crabs at 30℃, 35℃, and 40℃ was different. All the crabs died in only 10 minutes at 40℃, while they died after 3 days and 7 days at 35 ℃ and 30℃, respectively. In addition to normal temperature conditions, minimum survival time of the juvenile crabs of E. sinensis at other temperature condition was no more than 24 h. Before the 8th day, the death rate at 30℃ and normal temperature was different, change of turning slope for concentration of NH3-N and TN was contrary. Under normal temperature, the behavior of abdomen extension was not observed in juvenile crabs but the percentage time of abdomen extension was relatively long at 25℃. This research studied the influence of temperature stress on the survival of juvenile crabs of E. sinensis to provide information reference for the production and transportation of juvenile crab of E. sinensis.
    Description: Published
    Keywords: Eriocheir sinensis ; Crab ; Temperature ; Survival ; Behavior ; Stress
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.763-774
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  • 31
    Publication Date: 2021-05-19
    Description: A 15-day study was conducted to evaluate the effects of Artemia metanauplii enriched with two commercial supplements (Easy DHA-Selco and S. presso) which contained high levels of n–3 long chain polyunsaturated fatty acids (n–3 LC-PUFA) on growth performance, stress resistance and fatty acid profile of Litopenaeus vannamei post larvae (PL). In this regard, PL were fed with three different types of Artemia including: (1) newly hatched Artemia franciscana nauplii as the control group; (2) Artemia metanauplii enriched with Easy DHA-Selco; and (3) Artemia metanauplii enriched with S. presso. Survival rates did not change among different groups. PL fed Artemia enriched with the S. presso and the Easy DHA-Selco showed the highest wet and dry weight, respectively (p〈0.05). Moreover, PL fed Artemia enriched with the commercial emulsions had higher survival rate (~ 10 %) than treatments fed newly hatched Artemia (p〈0.05).The concentration of n–3 PUFA especially DHA and also n-3 / n-6 PUFA ratios were higher in PL fed with Artemia enriched with the commercial emulsions than the control group. Feeding enriched Artemia with n–3 LC-PUFA is recommended to improve growth performance in larval stages of L. vannamei.
    Description: Published
    Keywords: Litopenaeus vannamei ; Shrimp ; Growth performance ; Fatty acid ; Stress
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.562-574
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  • 32
    Publication Date: 2021-05-19
    Description: In this study, relationship between summer dynamics of chlorophyll a, nutrient, temperature, pH, salinity, dissolved oxygen, phytoplankton diversity and density are investigated in Gomishan wetland. Based on results, 5 branches of phytoplankton (13 genus and 15 species) has identified in summer. Cyanophyta and Bacillariophyta have the most phytoplankton diversity and Chlorophyta and Cyanophyta have the most cell density. At 4, 5 and 6 stations under the influence of agricultural drainage, urban and industrial wastewaters, the blooming of Cyanobacteria and Chlorophyta has occurred. The eutrophic level obtained eutrophic (mild) and hypereutrophic at these stations. Pearson correlation result shows that log Chla is significant with salinity at the level of p 〈0.05 and is significant with water temperature and orthophosphate at the level of p 〈0.01. According to the results, limited exchange of the Caspian Sea water has an effective role on environmental stress of the area that includes increased nutrient concentrations, temperature, salinity, concentration and density of the algal harmful species. To preventing harmful algal blooms, wastewater treatment from the primary pollution sources and using of aerobic stabilization ponds in the presence of resistant microalgae including chlorella, chlamydomonas and chroococcus is suggested.
    Description: Published
    Keywords: Diversity ; Stress ; Phytoplankton ; Nutrients ; Bloom
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.209-215
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  • 33
    Publication Date: 2022-10-26
    Description: © The Author(s), 2020. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Sandifer, P., Knapp, L., Lichtveld, M., Manley, R., Abramson, D., Caffey, R., Cochran, D., Collier, T., Ebi, K., Engel, L., Farrington, J., Finucane, M., Hale, C., Halpern, D., Harville, E., Hart, L., Hswen, Y., Kirkpatrick, B., McEwen, B., Morris, G., Orbach, R., Palinkas, L., Partyka, M., Porter, D., Prather, A. A., Rowles, T., Scott, G., Seeman, T., Solo-Gabriele, H., Svendsen, E., Tincher, T., Trtanj, J., Walker, A. H., Yehuda, R., Yip, F., Yoskowitz, D., & Singer, B. Framework for a community health observing system for the Gulf of Mexico Region: preparing for future disasters. Frontiers in Public Health, 8, (2020): 578463, doi:10.3389/fpubh.2020.578463.
    Description: The Gulf of Mexico (GoM) region is prone to disasters, including recurrent oil spills, hurricanes, floods, industrial accidents, harmful algal blooms, and the current COVID-19 pandemic. The GoM and other regions of the U.S. lack sufficient baseline health information to identify, attribute, mitigate, and facilitate prevention of major health effects of disasters. Developing capacity to assess adverse human health consequences of future disasters requires establishment of a comprehensive, sustained community health observing system, similar to the extensive and well-established environmental observing systems. We propose a system that combines six levels of health data domains, beginning with three existing, national surveys and studies plus three new nested, longitudinal cohort studies. The latter are the unique and most important parts of the system and are focused on the coastal regions of the five GoM States. A statistically representative sample of participants is proposed for the new cohort studies, stratified to ensure proportional inclusion of urban and rural populations and with additional recruitment as necessary to enroll participants from particularly vulnerable or under-represented groups. Secondary data sources such as syndromic surveillance systems, electronic health records, national community surveys, environmental exposure databases, social media, and remote sensing will inform and augment the collection of primary data. Primary data sources will include participant-provided information via questionnaires, clinical measures of mental and physical health, acquisition of biological specimens, and wearable health monitoring devices. A suite of biomarkers may be derived from biological specimens for use in health assessments, including calculation of allostatic load, a measure of cumulative stress. The framework also addresses data management and sharing, participant retention, and system governance. The observing system is designed to continue indefinitely to ensure that essential pre-, during-, and post-disaster health data are collected and maintained. It could also provide a model/vehicle for effective health observation related to infectious disease pandemics such as COVID-19. To our knowledge, there is no comprehensive, disaster-focused health observing system such as the one proposed here currently in existence or planned elsewhere. Significant strengths of the GoM Community Health Observing System (CHOS) are its longitudinal cohorts and ability to adapt rapidly as needs arise and new technologies develop.
    Description: This project was supported in part by contract # C-231826 between the Gulf of Mexico Alliance, on behalf of the Gulf of Mexico Research Initiative, and the College of Charleston. The content of this paper is solely the responsibility of the authors and does not necessarily represent the official views of the Gulf of Mexico Alliance, the Gulf of Mexico Research Initiative, the College of Charleston, or the Centers for Disease Control and Prevention. Mention of private companies, trade names, or products does not imply endorsement of any kind.
    Keywords: Health observing system ; Disasters ; Gulf of Mexico ; Cohort studies ; Stress ; COVID-19 ; Allostatic load ; Health surveillance
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 34
    Publication Date: 2019-10-15
    Description: This study describes three earthquake occurrence models as applied to the whole Italian territory, to assess the occurrence probabilities of future (M ≥ 5.0) earthquakes: two as short-term (24 hour) models, and one as long-term (5 and 10 years). The first model for short-term forecasts is a purely stochastic epidemic type earthquake sequence (ETES) model. The second short-term model is an epidemic rate-state (ERS) forecast based on a model that is physically constrained by the application to theearthquake clustering of the Dieterich rate-state constitutive law. The third forecast is based on a long-term stress transfer (LTST) model that considers the perturbations of earthquake probability for interacting faults by static Coulomb stress changes. These models have been submitted to the Collaboratory for the Study of Earthquake Predictability (CSEP) for forecast testingfor Italy (ETH Zurich), and they were locked down to test theirvalidity on real data in a future settingstartingfrom August 1, 2009.
    Description: Published
    Description: 41-50
    Description: 4T. Sismicità dell'Italia
    Description: 6T. Studi di pericolosità sismica e da maremoto
    Description: JCR Journal
    Keywords: Earthquake interactions and probability ; Statistical analysis ; Stress ; Historical seismology ; Earthquake faults ; Solid Earth
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 35
    Publication Date: 2021-05-19
    Description: One of the most striking phenomena in the Caspian Sea is the sea level rise. Sea level fluctuation is due to climatologically changes, regional precipitation, water evaporation, temperature, wind stresses, surges and geomorphology changes in the sea bed, alteration in atmospheric transport pattern as well as human activities such as construction of dams on the major rivers. More meteorological studies of Caspian Sea region as well as advanced watershed and ocean modeling must be used in order to predict the sea level fluctuation with acceptable results. In this research the variation of evaporation and precipitation in five coastal stations of south Caspian Sea from 1993 to 2008 has been studied and determines what are the effects of precipitation and evaporation in Caspian Sea fluctuation during this pried. The mean calculated evaporation in this period is about 922.9 mm. It is less than the mean calculated evaporation for long term period that is about 1007 millimeter/year. Mean calculated precipitation in this period is about 1292.6 mm. It is higher than mean calculated precipitation for long term period that is about 1221 millimeter/year. So in southern Caspian Sea, the increase of precipitation and the decrease of evaporation have an important role in sea level rise in recent years. The statistical index and correlation between atmospheric parameters are also determined and discussed in this research.
    Description: Published
    Keywords: Geomorphology ; Sea Level Fluctuation ; Evaporation ; Precipitation ; Temperature ; Stress ; Parameters ; Atmospheric
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.4-13
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  • 36
    Publication Date: 2021-05-19
    Description: This study was conducted to evaluate the effect of the chitosan diet on the intestinal histology, body composition and resistance towards salinity and thermal stresses in Caspian kutum (Rutilus frisii kutum) fingerlings. This research, using a completely random design, consisted of 0.25, 0.5, 1, and 2 g levels of chitosan per kg for each commercial diet of the Caspian kutum in three repititions. The Kutum fingerlings, with an average weight of 1.76 ± 0.15 g, were fed with the experimental diets for 8 weeks. At the end of the experiment, tissue sections were prepared by cutting 5mm-thick samples from the intestinses of the fish. To evaluate the resistance to salinity and thermal stresses, the fingerlings were exposed to a salinity stress of 11 ppt and 13 ppt and temperatures of 30 °C and 34 °C, afterwhich the survival rate was calculated. Microscopic observations showed that the intestinal villi height in the fish fed with the diet containing 1 g kg-1 of chitosan significantly increased to 319.93 µm compared to the control group (P〈0.05). The biochemical analysis of body composition had not significant difference throughout the groups (P〉0.05). Fish survival rate after 11 ppt and 13 ppt salinity stress showed no statistically significant difference (P〉0.05), but the survival rate of the fish fed with the diet containing 1g kg1 of chitosan after experiencing the 34 °C thermal stress significantly increased to 70% (P〈0.05). The results suggest that a chitosan level of 1g kg-1 in the diet can not only affect the survival rate and resistance of kutum fingerlings against thermal stress, but can also affect the height of the intestinal villi.
    Description: Published
    Keywords: Chitosan ; Diet ; Histology ; Body composition ; Salinity ; Stress ; Caspian Kutum ; Rutilus frisii kutum ; Fingerlings ; Intestinal histology
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.35-45
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  • 37
    Publication Date: 2021-05-19
    Description: The present study carried out to assess the effects of Benzo-α-Pyren (BaP) as a serious member of Polycyclic Aromatic Hydrocarbons (PAH) on the plasma levels of cortisol and triiodothyronine (T3) hormones in male Seabream, Acanthopagrus latus (Sparidea). To assess the acute effects of BaP on the endocrine system, a group of fish was injected with dissolved BaP in sunflower oil (50mg/kg BaP in 2µg/l oil according to the body weight). Other fishes were injected with 2µg/l body weight as controls. Blood samples from both groups collected 3 hours after injection. In another protocol, the chronic effects of BaP on the plasma levels of cortisol and T_3 were assessed. For this reason a group of fish was implanted with 50mg/kg BaP in 10µl/g coconut oil in respect to each fish body weight. As the previous protocol a control group was implanted with the same amount of oil without the BaP. Blood samples collected from both implanted groups (treatment and control) after 72 hours. According to the results, plasma levels of cortisol in yellowfin Seabream increased during both short time and long time exposure but T_3 levels in the plasma decreased during the chronic stress of BaP exposure. It seems the cortisol levels are elevating to provide more energy requirement under the acute and chronic stress conditions by direct effect on glyconeogenesis and fast blood sugar level to be consumed by cells. T_3 levels may be affected by inhibitory effect of Aryl hydrocarbon receptors (AhRs) which decreased it during long term exposure.
    Description: Published
    Keywords: Endocrine ; Benzo-α-Pyren ; BaP ; Stress ; Yellowfin Seabream ; Acanthopagrus latus ; Sparidea
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.25-31
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  • 38
    Publication Date: 2021-05-19
    Description: Apoptosis is a programmed cell death that has been attributed to the action of stress hormones, such as cortisol. We investigated the in vitro effect of cortisol in goldfish (Carassius auratus) mature (GSI: 2.75-4.65) or immature (GSI: 1.94-2.4) testes. Testes were taken out and transferred into culture medium (M 199), cut into 20 mm thick slices and supplemented with fetal bovine serum (FBS), added different doses of cortisol (0, 50, 100, 200, 400, 750 and 800 ng/ml) and incubated for 24h, 48h or 72h at 18°C. Samples were rinsed and homogenized with phosphate buffered saline (PBS) after incubation period. Duplicates or triplicates processed for caspase-3 activity. The results showed a significant increase in caspase-3 activity in immature testes after 72h treatment with 750ng/ml of cortisol (P〈0.05), and also at 400ng/ml (P〈0.05). In contrast, no significant differences were observed between non-treated and cortisol-treated samples from mature goldfish testes. In this study we have demonstrated, for the first time that the stress hormone cortisol induces apoptosis in the goldfish testis in a stage-specific manner (immature testis).
    Description: Published
    Keywords: Carassius auratus ; Apoptosis ; Caspase 3 ; Cortisol ; Goldfish ; Stress ; Testis ; Hormone ; Stress
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.1-14
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  • 39
    Publication Date: 2021-05-19
    Description: This study aimed to elucidate the influence of environment pH on survival, growth, energy allocation and oxidative damage of juvenile Scophthalmus maximus (19.89±0.25 g). Six pH treatments (6.3±0.2, 6.8±0.2, 7.3±0.2, 7.8±0.2, 8.3±0.2, 8.8±0.2) lasting for eight weeks were included. Measurements of survival (SR), feed conversion ratio (FCR), specific growth rate (SGR), weight gain rate (WGR), energy allocation, liver superoxide dismutase activity (SOD), catalase activity (CAT), and malondialdehyde concentration (MDA) were done. Results show that SR did not vary from pH 6.3 to 7.8, but reduced then significantly (p〈0.05); FCR raised remarkably (p〈0.05) while SGR and WGR decreased pronouncedly (p〈0.05). Most of the food energy was used in metabolism, followed by growth, feces loss and nitrogenous excretion. Energy deposited for growth showed a decreasing tendency when pH raised; while for metabolism showed a reverse trend. SOD showed insignificant difference from pH 6.3 to 7.8, but the activities then elevated obviously (p〈0.05) though a slight decrease was found from pH 8.3 to 8.8 (p〉0.05). CAT kept stable between pH 6.3 and 7.3, then sharply increased (p〈0.05), but no significant differences were found between pH 8.3 and 8.8 (p〉0.05). Subsequent decrease in MDA was found from pH 6.3 to 8.3 then the concentration smoothly increased. Overall, our results indicate that a pH in the range of 6.8 to 7.8 is recommended in the growth environment in cultivation of juvenile turbot.
    Description: Published
    Keywords: Juvenile turbot ; Scophthalmus maximus ; pH ; Water ; Survival ; Growth ; Energy allocation ; Oxidative damage ; Stress ; Parameters ; FCR ; SGR ; WGR ; CAT ; SOD
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.675-689
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  • 40
    Publication Date: 2021-05-19
    Description: In this study, the malondialdehyde (MDA) levels in the muscle, liver and kidney tissues and the antioxidant vitamin (A, C, E) levels in the muscle tissue of juvenile rainbow trout were investigated under different oxygen levels (3.5 mg O2/l, 4.5 mg O2/l and 7 mg O2/l) at the end of the 8 hour trial. Fish (initial weight and length, 30.19±2.2 g and 13.15±0.22 cm, respectively) were distributed into 9 fiberglass rectangular tanks. The highest MDA level of all tissues was obtained in 3.5 mg O2/l (p〈0.05). Different oxygen levels did not affect muscle vitamin A concentration statically (p〉0.05). But the highest muscle vitamin C and E concentrations were obtained in 7 mg O2/l. (p〈0.05), followed by 3.5 mg O2/l, while the lowest muscle vitamin C concentration was obtained in 4.5 mg O2/l. (p〈0.05).
    Description: Published
    Keywords: Rainbow trout ; Hypoxia ; Stress ; Antioxidant vitamins ; Lipid peroxidation
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.315-324
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  • 41
    Publication Date: 2021-05-19
    Description: This study was performed in order to evaluate the effects of chronic stress (density) and acute stress (handling) existed in culture environments on stress and hematological parameters of beluga sturgeon (Huso huso) under winter condition (below 10°C) after application of anesthesia. Fish with mean (± SE) weight of 399 ± 1.4 g were kept in the low (1 kg/m2) and high densities (8 kg/m2) in three replicates for a week. Then, fish were held under stress condition so that they were quickly removed from the rearing tank and then anesthetized for 2 minutes in container (50 l) includes 400 mg/l clove powder extract. They were then returned to the original tanks. Blood samples were taken before the stress (0 time), 1, 3, 6, 12, 24 and 48 hours after application of the stress;and the stress indicators (cortisol, glucose and lactate) and hematological parameters (hematocrit, hemoglobin, number of red blood cells, MCV, MCH, MCHC, number of white blood cells, lymphocytes, neutrophils, eosinophils and monocytes) were measured. No differences in measured parameters were observed after one week of holding fish at low and high densities. The results of stress indicators, one hour after acute stress and anesthesia showed a significant difference with resting time (p〈0.001). Also significant difference was observed on lactate levels between the low density and high density densities at 3 h after acute stress and anesthesia (p=0.032). Number of white blood cells at 1 and 6 h after acute stress and anesthesia in high density showed significant difference with resting time (p〈0.001). MCV showed significant difference between two treatments at 48 h after the stress and anesthesia (p=0.016). The other parameters did not show any significant difference between treatments (p〉0.05). The results revealed that beluga sturgeon has high resistance against chronic and acute stressors and anesthesia. However, it seems that anesthesia could not control the low negative effects of stress even in this condition of low temperature.
    Description: Published
    Keywords: Huso huso L. ; Huso huso ; Hematocrit ; Hemoglobin ; Stress ; Beluga ; Density ; Anesthesia ; Low temperature ; Hematological ; Juvenile ; Sturgeon ; Blood ; Temperature
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.127-139
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  • 42
    Publication Date: 2021-05-19
    Description: The present exposition was designed to evaluate blood serum changes in tiger grouper, Epinephelus fuscoguttatus in response to changes in water temperature and salinity. Uniformly sized fingerlings were randomly distributed into different groups at fifteen fish per tank, in two replicates. Each group represented experimental fishes subjected to water temperatures of 18, 24, 28 and 30°C (control), and salinity of 10, 20 and 30 (control) ppt respectively. Replicate groups of fishes in each tank were exposed to these physiological stressors for 4 and 36 hours. At the end of experiment, blood samples were collected via caudal vein. The collected blood was centrifuged to obtain serum, andanalyzed for cortisol and glucose concentrations, using ELISA method. Results showed that decrease (to 28, 24 and 18°C) in water temperature from the control (30°C) and salinity from 30 ppt to 20 and 10 ppt for 4 and 36 hours influenced changes in the physical appearances (skin coloration) and behaviors (swimming vigor, opercula movement and schooling) of fish, to suggest responses to stress. Further, analyses of serum cortisol revealed consistently higher concentrations at the lower temperatures tested (to 28, 24 and 18°C), than the optimum tolerated by the species. Interestingly, fish maintained at 28°C for 36 hours contained lower serum cortisol concentrations compared to control groups. Meanwhile, the increment of the serum cortisol concentration occurs at decreased water salinity from 30 ppt to 20 and 10 ppt for 4 and 36 hours. It is concluded that: 1) water temperature and salinity are important physiological stressors; 2) sudden alteration of these factors leads to stress, and should therefore be avoided or minimized; 3) results of the present trial suggest that the blood serum factors are reliable parameters for evaluating the level of stress in fish.
    Description: Published
    Keywords: Aquaculture ; Tiger grouper ; Epinephelus fuscoguttatus ; Temperature and salinity change ; Cortisol concentration ; Behavior ; Stress ; Serum
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.1511-1525
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  • 43
    Publication Date: 2021-05-19
    Description: Chronic and acute effects of stress on the reproductive system and hormonal balance in higher vertebrates is well documented, but the subject is little investigated on fish. Understanding the courses of stress to eliminate or minimize them, will contribute to designing culture systems, or methods, based on the physiological requirements of fish. This will consequently enhance production of cultured fish. This study has investigated the effects of stress as a result of handling and induced spawning through injection of HCG (1100 IU/kg), GnRH (2 Ug/kg), dopamine antagonist (25 mg/kg) and distilled water (0.5 cc/kg). Taking into consideration that the secretion of cortisol is the first response to stress, therefor the level of cortisol in the blood of injected fish (rainbow trout spawners) was compared by using Radio Immuno-Assay technic. In three treatments cortisol level of blood after 10, 15, 20, 25, 30 and 35 minutes after stress was measured. The present study showed a significant increase in the level of cortisol in the blood of fish compared to uninjected control treatment. This increase was caused by stress related to handling and spawning. There were no highly significant difference (P 〈 0.01) in the cortisol level among the fish injected with HCG, GnRH and dopamine antagonist. The type of injecting material does not make a difference in the amount of stress and cortisol level. This research has concluded that handling and injection make a significant stress for the spawning fish. It is recommended to use ecological factors to persuade natural spawning without disturbance and injections.
    Description: Published
    Keywords: Physiological ; Ecological ; Cortisol ; Hormone ; Rainbow trout ; Chronic effect ; Stress ; Hormonal balance ; Vertebrates ; Fish ; Culture system ; Spawning ; Injection ; HCG ; Dopamine antagonist ; Distilled water ; Blood
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.33-40
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  • 44
    Publication Date: 2021-05-19
    Description: Fish are easily stressed by handling, crowding and transport and stress can result in immuno-suppression, physical injury or even death. ....
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Fish ; Anesthesia ; Stress ; Hormone ; Hematological indices
    Repository Name: AquaDocs
    Type: Report , Not Known
    Format: 245pp.
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  • 45
    Publication Date: 2021-05-19
    Description: Gibel carp (Carassius auratus gibelio) juveniles with an average weight of 8.73± 2.1 g were fed a basal diet (control) and three experimental diets (T200, T400 and T800), containing 200, 400 and 800 mgkg-1, respectively of thyme essential oil (Thymus vulgaris) for six weeks. After six weeks feeding trial, both control and thyme essential oil-added feed groups were exposed to sub-acute toxicity of silver nanoparticles (Ag-NPs) for a period of 96 h. At 96 h after exposure, the number of erythrocytes (RBC), leucocyte (WBC), hematocrit (Hct), hemoglobin (Hb), the differential leukocyte count in blood and alanine aminotransferase (ALT), aspartate aminotransferase (AST) activity, HDL-cholesterol, LDL-cholesterol, cortisol and lactate in serum were measured. The results revealed feeding a thyme essential oil diet significantly conferred resistance to oxidative stress with sub-acute toxicity of Ag-NPs. Thyme essential oil enhanced the RBC and WBC count, hematocrit and hemoglobin content, at both low (T400) and high doses (T800). Biochemical analysis showed that serum ALT and AST activities, and LDL-cholesterol in the thyme essential oil-added feed groups were significantly reduced with increasing dietary thyme essential oil. Plasma HDL-cholesterol was significantly elevated by a high-dose of dietary thyme essential oil (T800). Furthermore, cortisol and lactate levels in serum significantly decreased throughout the thyme essential oil-added feed groups compared to the control. In summary, the use of thyme essential oil at 400 and 800 mgkg-1, as dietary supplements, has potential to decrease oxidative stress of gibel carp providing resistance to non-fatal effects of pollutant by Ag-NPs.
    Description: Published
    Keywords: Carassius auratus gibelio ; Silver nanoparticles ; Gibel carp ; Thyme essential oil ; Plasma electrolytes ; Hematological parameters ; Dietary ; Stress ; Enzymes
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.1063-1084
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  • 46
    Publication Date: 2021-05-19
    Description: Unwanted organisms of five shrimp farms in Bushehr were studied from September to December 1997 in a culture period. In a random and systematic sampling 2 species of wild shrimp, 13 species of fish, 2 species of carb, one species of barnacles, 2 species of sea weeds, and 2 group of birds were collected and identified. These organisms are considered as pests, food competitors, predators and diseases vectors that with increasing food conversion, hunting mechanical injuries, stress and diseases take important part in decreasing the shrimp production. The best way of eliminating them is to avoid them entering in shrimp farms by paying enough attention to ponds and farms.
    Description: Published
    Keywords: Mechanical injuries ; Stress ; Survey ; Organisms ; Shrimp ; Farms ; Sampling ; Species ; Fish ; Carb ; Barnacles ; Food competitors ; Predators ; Diseases vectors ; stress diseases ; Seaweeds
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.107-113
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  • 47
    Publication Date: 2021-05-19
    Description: An 8- week feeding experiment was conducted to evaluate the effect of dietary betain as a feed attractant on growth, survival, body composition and resistance rate on kutum (Rutilus frisii kutum) fingerling. 225 fish by the initial weight of 2.26±0.2 g and density of 15 fish per tank. Five treatments of different levels of betain including 0 (control),0.5%, 1%, 1.5% and 2% added to diet containing 40% protein and 8% lipid. According to the results of this study, no significant differences in growth performance and feeding parameters observed between fish fed control and betain supplementation diets (p〉0.05) . No significant differences in survival rate among all treatment groups (p〉0.05). There were no significant differences in body composition among all treatment groups (p〉0.05). Resistance rate were not influenced by the levels of betain (P〉0.05). Totally considering betain did not show significant effect on the growth, surviving and resistance to stress in kutum fingerling.
    Description: Published
    Keywords: Rutilus frisii kutum ; Betain ; Growth ; Survival ; Body composition ; Stress ; kutum (Rutilus frisii kutum) ; Feed ; Fingerlings ; Growth performance
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.83-92
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  • 48
    Publication Date: 2021-05-19
    Description: Gravid wild kutum broodstock, Rutilus frisii kutum, on their upstream migration to Valiabad River (northern Iran) were kept in captivity to allow them to ovulate (captive ripe). Then the impact of captivity on some reproductive and physiological parameters (i.e., plasma cortisol and glucose levels, fertilization percentage, gonadosomatic index and fecundity) were assessed and results were compared with those obtained from naturally ovulated broodstock (ripe). Plasma cortisol level was not significantly different between gravid and captive ripe broodstock but was significantly higher (P〈0.05) than that in ripe group. Glucose level was significantly higher (P〈0.05) in captive ripe compared to that in ripe or gravid groups. Mean gonadosomatic index, fecundity, and fertilization rate did not affect as a result of stress by captivity. Inverse relationship between plasma cortisol levels and fertilization rate was observed.
    Description: Published
    Keywords: Captivity ; Cortisol ; Fertilization rate ; Glucose ; Stress ; Kutum
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.478-484
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  • 49
    Publication Date: 2021-05-19
    Description: Water and electrolyte balance is vital for aquatic organisms in both hyper and hypo osmotic environments. Kidneys as excretory organs play an important role in osmoregulation and body fluid homeostasis. In this study a total number of 180 Sobayti (Teleost: Sparidentex hasta) were exposed to different salinities to assess changes in the kidney structure and alterations in plasma levels of electrolytes, glucose and cortisol. Salinity challenges were examined for a period of 14 days in four experimental groups: 40ppt as control and 5, 20 and 60 ppt as other experimental treatments. 24 hours after salinity challenge, significant changes were observed in the lumen diameter of the primary proximal tubule at the sections from trunk kidney in both 5 and 20 ppt conditions (P〈0.05). Lumen diameter of the second part of the proximal tubule did not differ in any of the experimental salinities (P〉0.05).However, lumen diameter of the distal tubule of nephron in the trunk kidney, increased significantly in 60 ppt treatment 48 hours from starting the experiment (P〈0.05). The thickness of the epithelium tubule in both trunk and tail parts showed no significant differences during the adaptations (P〉0.05). According to the results, histomorphological changes in the different parts of the kidney returned to the basic structure with in 24 to 48hours after exposure to different salinities.
    Description: Published
    Keywords: Physiology ; Histology ; Histomorphological ; Osmoregulation ; Kidney ; Stress ; Sparidentex hasta ; Environmental
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.15-21
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  • 50
    Publication Date: 2021-05-19
    Description: Impact of anesthesia with electric shock on some of physiological parameters was studied in in Acipenser nudiventris In this study, we investigated the induction and recovery times and physiological response of Acipensernudiventris. We anesthetized them by CO2 (mmhg), clove powder (mg/L), and electric shock (V). Shortest and longest induction time were 0.15 min and 4.25 min when electric shock and clove powder were used. On the other hand, shortest and longest time of recovery time were 3.23 min and 2. 20 min respectively when electric shock and CO2 gas were used. Cortisol and glucose levels increased 1 and 6 hours after anesthesia. Changes in plasma osmolality were less among the anesthesia treatments. Results demonstrated that electric shock was a more effective method for quick induction time, although all anesthetic methods were found to be safe.
    Description: Published
    Keywords: Physiological ; Anesthesia ; Acipenser nudiventris ; Stress ; Biochemical indices ; Parameters
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.46-53
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  • 51
    Publication Date: 2021-05-19
    Description: Melissa officinalis is a perennial herbaceous plant from Lamiaceae family, widely used in food and pharmaceutical industries to add aroma. Drought stress in plants may happen due to the increase in water loss, insufficient water absorption or both. Salicylic acid (SA) is an important secondary metabolite in plants with hormone-like action in some biochemical pathways. Adding it during water-deficit stress, may alter a number of physiological processes, increasing the resistance of plant against possible damage by water loss. The aim of this study was to examine the effect of drought stress (DRU) on secondary metabolites of Melissa officinalis and also the efficacy of salicylic acid treatment to minimize the damages. According to the results, treatment of plant with 0.7 mM salicylic acid had considerable alteration in the quantity of important secondary metabolites. Protein concentration increased in all stages; Chlorophyll a reached to the highest amount; the amount of the MDA increased at the first and second stages in 1/3 fc drought treatment as well as at the third stage in 2/3 fc. Besides, total phenol content increased at stage I in 1/3 fc drought and the flavonoid content increased in 1/3 fc drought at all stages. Finally, content of anthocyanin was increased at first and third stages 1/3 fc drought, as well as at second stage in 1/3 fc drought. In conclusion, application of salicylic acid (0.7 mM) was useful for improving quality of lemon balm subjected to stress due to water deficit.
    Description: Published
    Keywords: Drought stress ; Salicylic acid ; Melissa officinalis L. ; Photosynthetic pigments ; Antioxidant capacity ; Stress
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.121-134
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  • 52
    Publication Date: 2021-05-19
    Description: The present study carried out to assess the effects of Benzo-α-Pyrene (BaP) as a serious member of Polycyclic Aromatic Hydrocarbons (PAH) on the plasma levels of cortisol and triiodothyronine (T3) hormones in male Seabream, Acanthopagrus latus (Sparidea). To assess the acute effects of BaP on the endocrine system, a group of fish was injected with dissolved BaP in sunflower oil (50mg/kg BaP in 2µg/l oil according to the body weight). Other fishes were injected with 2µg/l body weight as controls. Blood samples from both groups collected 3 hours after injection. In another protocol, the chronic effects of BaP on the plasma levels of cortisol and T3 were assessed. For this reason a group of fish was implanted with 50mg/kg BaP in 10µl/g coconut oil in respect to each fish body weight. As the previous protocol a control group was implanted with the same amount of oil without the BaP. Blood samples collected from both implanted groups (treatment and control) after 72 hours. According to the results, plasma levels of cortisol in yellowfin Seabream increased during both short time and long time exposure but T3 levels in the plasma decreased during the chronic stress of BaP exposure. It seems the cortisol levels are elevating to provide more energy requirement under the acute and chronic stress conditions by direct effect on glyconeogenesis and fast blood sugar level to be consumed by cells. T3 levels may be affected by inhibitory effect of Aryl hydrocarbon receptors (AhRs) which decreased it during long term exposure.
    Description: Published
    Keywords: Testosterone ; Cortisol ; Reproductive physiology ; Stress ; Polycyclic Aromatic Hydrocarbon ; Plasma ; Spermatogenesis ; Hormone ; Yellowfin Seabream ; Acanthopagrus latus ; Males
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.40-47
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  • 53
    Publication Date: 2021-05-19
    Description: This study was conducted to investigate the effects of rotifers enriched with betaine and concentrated diet containing betaine on growth performance, survival and resistance to salinity (10 and 5Oppt), temperature (42°C) and formalin (100ppm) stresses in Indian white prawn (Fenneropenaeus indicus) post-larvae. A complete randomized design with three replicates per treatment in nine 20-1 tanks was chosen. Treatments were: Artemia nauplii, rotifers and concentrated diet (control); Artemia nauplii, rotifers enriched with betaine and concentrated diet (treatment 1) and Artemia nauplii, rotifers enriched with betaine and concentrated diet containing betaine (0.8%) (treatment 2). The larvae were fed 6 times per day at 4h intervals. There were significant differences in growth and survival rate between the treatments containing betaine (treatment 1 and 2) and control treatment (P〈0.05). Furthermore, the larvae that were fed with betaine (treatment 1 and 2) had significantly higher survival rate in stress resistance testes (P〈0.05). The present study showed that betaine has positive effect on growth performance, survival rate and resistance to stresses in Indian white prawn.
    Description: Published
    Keywords: Nauplii ; Anemia ; Rotifer ; Feeding ; Stress
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.1-10
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  • 54
    Publication Date: 2021-05-19
    Description: The study on the ecophysiological impacts of stress in female Persian sturgeon broodfishes revealed that the average cortisol level varried in all broodfish caught at the Sefidrud River (163.38±21.2ng mL-1), Sefidrud River estuary (260.27±19.7ng mL-1) and Gorganrud River estuary (179.38±20.8ng mL-1). The variations in serum glucose levels were 140.65±12.05mg dL-1, 144.44±5.9mg dL-1 and 126.24±11mg dL-1, respectively. The maximum level of cortisol (781 ng mL-1) and serum glucose (281 mg dL-1) were observed during the transport of broodfish from the capture stations to the hatcheries and the minimum level of cortisol (25.2 ng mL-1) and serum glucose (33 mg dL-1) were observed during the confinement of broodfishes in the breeding ponds. The rhythmic and significant variations of cortisol level during capture, handling, transport and confinement of female Persian sturgeon broodfish in all three regions can be regarded as a valuable indicator of stress.
    Description: Published
    Keywords: Stress ; Cortisol ; Glucose ; Acipenser persicus ; Broodfish
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.37-52
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  • 55
    Publication Date: 2021-05-19
    Description: Chronic stresses can influence the behavioral and physiological activities of animals and can lead to reduction of resistance against disease and decrease in growth rate and production.Artemianauplii enriched with essential nutrients particularly fatty acids have been used to promote growth, survival and resistance of different species of aquatic animals to various environmental stresses as well as infectious diseases. In this study we investigated the resistance to environmental stress (temperature, salinity and hypoxi) in larvae of rainbow trout fed Artemianauplii enriched with vegetable oils. The experiment was carried out in 6 triplicate treatments for a period of 10 days. The feeding treatments included: 1) commercial starter feed for trout (Control) 2) Artemianauplii enriched with fish oil, 3) Artemianauplii enriched with sunflower oil, 4) Artemianauplii enriched with canola oil, 5) Artemianauplii enriched with soybean oil and 6) newly hatched nauplli of Artemia. The results showed significant differences in tolerance of fish larvae to high temperature (20 and 25°C), hypoxia stress (5 ppm) and salinity stress (10, 15 and 20 mg.l-1) among different groups. Highest survival to all experimental stresses (except in one case) was observed in larvae fed Artemianauplii enriched with canola oil compared to those fed control diet ( p〈0.05), but in most cases not significant with larvae fed Artemianauplii enriched with fish oil.
    Description: Published
    Keywords: Feeding ; Rainbow Trout ; Larvae ; Oncorhynchus Mykiss ; Artemianauplii ; Oil ; Resistance ; Temperature ; Salinity ; Stress ; Diet
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.42-51
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  • 56
    Publication Date: 2021-11-22
    Description: In the present study, different oxygen levels were examined in two weight groups of great sturgeon Huso huso including small size (with initial weight 280.9 ± 49.2 g) and large size (with initial weight 1217.9 ± 138.1 g). The fish were kept in hypoxia (2-3 mg/l), normoxia (5-6 mg/l) and hyperoxia (9-10 mg/l) conditions for 8 weeks and then were individually placed in the tanks with oxygen level of 6 mg/l to levels causing sedate fish and subsequently dissolved oxygen level in water was measured every 30 minutes. No significant effects on blood cortisol and glucose levels were observed after 8 weeks (P〉0.05), but there were significant differences in cortisol concentrations between treatments (P〈0.05) after stress. Significant differences were found in cortisol and glucose levels in pre and post stress conditions in small size, but no significant differences were observed (P〉0.05) in large size. There were no significant differences in oxygen consumption among treatments (P〉0.05). Results revealed that dissolved oxygen had a significant effect on growth of H. huso and also a low level of oxygen accompanied by reduction in feed intake resulted in lower growth and changes in stress response.
    Description: Published
    Keywords: Biology ; Physiology ; Great Sturgeon ; Huso huso ; Growth performance ; Hypoxia ; Hyperoxia ; Oxygen consumption ; Stress ; Weight ; Consumption
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.533-549
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  • 57
    Publication Date: 2022-05-26
    Description: © The Author(s), 2018. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Applied and Environmental Microbiology 84 (2018): e02034-17, doi:10.1128/AEM.02034-17.
    Description: Phytoplankton replace phosphorus-containing lipids (P-lipids) with non-P analogues, boosting growth in P-limited oceans. In the model diatom Thalassiosira pseudonana, the substitution dynamics of lipid headgroups are well described, but those of the individual lipids, differing in fatty acid composition, are unknown. Moreover, the behavior of lipids outside the common headgroup classes and the relationship between lipid substitution and cellular particulate organic P (POP) have yet to be reported. We investigated these through the mass spectrometric lipidomics of P-replete (P+) and P-depleted (P−) T. pseudonana cultures. Nonlipidic POP was depleted rapidly by the initiation of P stress, followed by the cessation of P-lipid biosynthesis and per-cell reductions in the P-lipid levels of successive generations. Minor P-lipid degradative breakdown was observed, releasing P for other processes, but most P-lipids remained intact. This may confer an advantage on efficient heterotrophic lipid consumers in P-limited oceans. Glycerophosphatidylcholine (PC), the predominant P-lipid, was similar in composition to its betaine substitute lipid. During substitution, PC was less abundant per cell and was more highly unsaturated in composition. This may reflect underlying biosynthetic processes or the regulation of membrane biophysical properties subject to lipid substitution. Finally, levels of several diglycosylceramide lipids increased as much as 10-fold under P stress. These represent novel substitute lipids and potential biomarkers for the study of P limitation in situ, contributing to growing evidence highlighting the importance of sphingolipids in phycology. These findings contribute much to our understanding of P-lipid substitution, a powerful and widespread adaptation to P limitation in the oligotrophic ocean.
    Description: This work was funded by the University of Southampton Vice Chancellors Scholarship Award.
    Keywords: Thalassiosira pseudonana ; Phospholipid ; Sphingolipid ; Diatom ; Lipidomics ; Phosphorus ; Stress ; Limitation ; Substitution ; Biomarker
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 58
    Publication Date: 2021-05-19
    Description: This study was conducted to evaluate the effect of probiotic supplementation of Primalac on growth performance, some blood biochemical parameters, survival and salinity tolerance of the Caspian kutum fry. Fish (1.002±0.001 g) were classified to four groups fed on diets containing Primalac in different levels: 0 (control), 0.05, 0.10 and 0.15 % for 45 days. The results showed that there was a significant increase in final weight, weight gain and specific growth rate in those fish fed 0.10% Primalac diets (p〈0.05). In addition, food conversion ratio of fish fed Primalac diets was significantly (p〈0.05) lower than those fed the control group. However, there was no significant differences in condition factor, blood glucose and blood total protein content between fish fed different experimental diets (p〉0.05). On the other hand, blood cholesterol of the Caspian kutum was significantly increased in control group in comparison with Primalac treatments (p〈0.05). Survival and tolerance to salinity stress challenge remained unaffected by dietary supplementation of Primalac (p〉0.05). The results of the present study indicate that the supplement of 0.10% Primalac have a positive effect on the growth performance and blood biochemical parameters of the Caspian kutum fry.
    Description: Published
    Keywords: Primalac ; Rutilus kutum ; Caspian kutum ; Probiotic ; Growth ; Performance ; Blood ; Stress ; Survival ; Biochemical ; Parameters
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.95-102
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  • 59
    Publication Date: 2021-05-19
    Description: This study was carried out to investigate the effects of different levels of fennel essential oil (Foeniculum vulgare) on some biochemical parameters and salinity stress resistance of Caspian Kutum (Rutilus kutum) fry. For this purpose, Kutum fry with an average initial weight 0.6±0.002 gr were divided randomly in 5 treatments including 0 (control), 100, 200, 400 and 600 mg fennel essential oil/kg diet and fed 3 times a day at a ratio of 7-12% body weight for 60 days. At the end of the experiment, biochemical parameters and salinity stress resistance were assessed. Results of serum biochemical analyze showed that the highest level of total protein and globulin was observed in 600 mg fennel essential oil/kg diet. The highest level of albumin and cholesterol was observed in 100 and 400 mg fennel essential oil/kg diet and the highest level of triglyceride, glucose and cortisol was observed in control (p〈0.05). Results of salinity stress (6, 13 and 20 g/l) showed that 100 and 400 mg fennel essential oil/kg diet treatments showed the lowest response to stress and there were the lowest changes in cortisol and glucose levels before and after stress compare to control. Highest survival was observed in 100 and 400 mg fennel essential oil/kg diet. In conclusion results suggested that Fennel essential oil can improve immune system of fries by promoting biochemical parameters (total protein, albumin, globulin, triglyceride, glucose and cortisol). Also plays important role in increasing stress resistance of Kutum fry and the best operation is related to 100 mg fennel essential oil/kg diet.
    Description: Published
    Keywords: Fennel ; Foeniculum vulgare ; Rutilus kutum ; Kutum ; Essential ; Essential oil ; Diet ; Biochemical ; Parameters ; Salinity ; Stress ; Resistance ; Survival ; Fry
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.1-16
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  • 60
    Publication Date: 2021-05-19
    Description: Nowadays, herbal products as a new class of growth promoters that provide an alternative feeding strategy to replace antibiotic growth promoters in aquaculture. This study was conducted to investigate the effects of different levels of sangrovit (0, 0.05, 0.1 and 0.15 %) on growth, some of blood biochemical parameters, survival and salinity tolerance capacity in Cyprinus carpio (2.62±0.117 gr). After 45 days of feeding, results showed that growth performance including of weight gain and % specific growth rate improved which fish fed whit sangrovit compared with to control group, but there was no significant differences in growth parameters which fish fed with herbal supplement compared to control group (P〉0.05). There were significant differences in biochemical parameters in fish fed with sangrovit compared to the control group (P〈0.05). The lowest level of cholesterol was observed in 0.05 % group and the highest level of total protein was observed in 0.15 % group. The highest levels of glucose observed in control treatment. In order to determine the effect of the herbal supplement on resistance to salinity stress, salinity stress was carried out after 45 days of feeding. Blood samples were obtained at 24, 72, 120 and 168 hours after stress. Hematocrit had significant difference in each groups (P〈0.05). On the third day after stress, hematocrit levels were decreased in all treatments. Survival and tolerance to salinity stress challenge remained unaffected by dietary supplementation of sangrovit. The results of this study showed that addition of sangrovit to fish diet can improve growth performance and blood biochemical parameters of common carp fingerlings
    Description: Published
    Keywords: Sangrovit ; Common carp ; Cyprinus carpio ; Growth ; Performance ; Blood ; Stress ; Biochemical ; Parameters ; Survival
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.13-22
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  • 61
    Publication Date: 2021-05-19
    Description: Reproductive performance of male southern white shrimp Litopenaeusschmittidecreased over time possibly attaining a reproductive exhaustion that results in a lower physiological condition that includes a decreased immune response capacity. Several indicators of immune and metabolic status such as phenoloxidase activity (PO), total hemocytes count (THC), hemoagglutinating activity (HA), total proteins, and glucose concentration in the hemolymph were analyzed in wild and pond-reared adult males at 3, 30, and 60 days after introduction to a production cycle in a commercial hatchery. High PO activity, high levels of glucose, and low levels of protein in the hemolymph suggest a general stress condition at the beginning of the production cycle because of the manipulation involved when animals were transferred to the hatchery. As indicated by initial levels of glucose, wild shrimp are more susceptible to such stress. After one month, all indicators suggest optimal conditions for shrimp, which, however, deteriorated in the second month when higher PO activity and lower levels of THC, hemoagglutinating activity, glucose, and proteins were observed, compared to values at 30 days. These results indicate that after a certain period under laboratory conditions associated with high reproductive activity, males of L.schmittihave a depressed overall physiological status and should be replaced.
    Description: Published
    Keywords: Broodstock ; Crustacean ; Defence system ; Glucose ; Phenoloxydase ; Stress
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.591-597
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  • 62
    Publication Date: 2021-05-19
    Description: The present study conducted to investigate the effect of cortisol injection on growth indices, food intake and plasma cortisol in juvenile common carp (Cyprinus carpio). After 2 weeks adaptation, 240 fish with 19.5 ± 0.2 g average weight were randomly distributed in to 12 fiberglass tanks with four treatments and three replicates (20 fish per tank). Based on body weight, cortisol (mixed with oil) was injected to treatments with different dosages at 0 (C0), 1 (C1) and 10 (C10) µg/g. At the end of 21 days, fish were weighed and growth parameters showed significant reduction in C10. No significant change was observed in hepatosomatic index among different treatments. Food intake were recorded daily during the experiment and showed significant reduction in days 1 to 8, 16 and 19 in C10 compared to control group . Blood was taken to determine plasma cortisol at the start, day 3, day 7 and day 21 of the experiment. Cortisol concentrations showed significant reduction in C10 compared to C0 group three days after the initiation of the experiment. The results showed that increasing of cortisol in a short time after injection, affected by changes of blood plasma cortisol and reduction of food intake could negatively have an effect on growth.
    Description: Published
    Keywords: Plasma ; Common carp ; Cyprinus carpio ; Appetite, Liver ; Food ; Growth ; Blood ; Juvenile ; Cortisol ; Stress
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.1-12
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  • 63
    Publication Date: 2021-05-19
    Description: Salinity tolerance in Persian sturgeon larvae (Acipenser persicus) fed with enriched Artemia urmiana nauplii were investigated when exposed to different salinity. For this purpose, cyst of Artemia urmiana hatched and enriched with a commercial emulsion, ICES30/4 supplemented with three levels of vitamin C (10, 20 and 30%) each with 3 replications according to standard condition and fed to Persian sturgeon larvae during 20 experimental days. At the end of this period, total length, weight, lipid, unsaturated fatty acids contents and vitamin C in fish larvae were measured. Fish larvae were exposed to 6, 12 and 18ppt salinity, and salinity tolerance were surveyed after 120h. The results showed that survival percentage as salinity tolerance indicator increased compared to control group that are larvae fed un-enriched Artemia nauplii. ICES40/3 with 20% vitamin C led to the highest salinity tolerance at 12ppt in Persian sturgeon larvae (99±1) but in 18ppt all larvae were died. The increase in salinity tolerance is likely due to omega 3 and 6 increase in fish larvae fed with Artemia enriched with ICES30/4.
    Description: Published
    Keywords: Acipencer persicus ; HUFA ; Nutrition ; Stress ; Sturgeon fish ; Survey ; Larvae ; Persian sturgeon ; Food ; Vitamin C
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.45-54
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  • 64
    Publication Date: 2021-05-19
    Description: In this study, the effect of commercial food replacement with earthworm (Eisenia foetida) on growth, survival, the number of larvae and their resistance to larval salinity stress in Swordtail fish (Xiphophorus helleri) was investigated. A completely randomized design experiment comprising of four treatments: T1 (100% commercial food), T2 (25% Earth worm +75% Commercial food), T3 (50% Earth worm + 50% commercial food), T4 (75% Earth worm + 25% Commercial food) were performed in triplicate. Swordtail fish were fed with 3% of its weight, 3 times per day. After a 60-day experimental feeding period, growth factors and survival rate of fish fed with different diet treatments were not affected. However, the growth factors and survival rate were affected by sex and the weight gain, specific growth rate and survival rate of females was significantly higher than males. The highest number of born larvae was observed in T2 which was significantly more than control. (P〈0.05). In T4, larvae showed the lowest resistance to salinity stress test (P〈0.05). Results showed that number of born larvae significantly increased in 25% replacement than control, so the Swordtail fish could be fed with low levels (25%) of earthworm without any unfavorable effects on the growth and survival rate and their larval resistance to salinity stress test.
    Description: Published
    Keywords: Earthworm ; Replacement ; Eisenia foetida ; Swordtail fish ; Xiphophorus helleri ; Commercial ; Food ; Replacement ; Growth ; Survival ; Larvae ; Resistance ; Stress ; Fish ; Fed ; Salinity
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.231-242
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  • 65
    Publication Date: 2021-05-19
    Description: Effects of using n-3 HUFA-enriched Artemia and non-enriched Artemia as the starter food for growth and survival of rainbow trout larvae compared to commercial concentrated food were investigated in this study. The larvae with average weight of 92.9 mg were fed for 20 days with four food treatments included of commercial concentrated food, newly hatched Artemia, enriched Artemia, and mixture of enriched Artemia and concentrated food. At the end of experiment, the highest weight gain percentage was 104.4% in those larvae fed with enriched Artemia (p〈 0.05). The highest survival rate was 96.5 % observed in larvae fed with mixture of enriched Artemia and commercial concentrated food (P〈0.05). Larvae of third treatment that were fed with enriched Artemia with a survival rate of 98.9 %±1.9 under stress condition of low pH and survival rate of 66.5%±3.7 under stress condition of higher pH in rearing environment, were the most resistant larvae against stress resulting from pH fluctuation (P〈0.05). Meanwhile the highest resistance against stress, resulting from temperature changes, was seen in larvae of the third and fourth treatment with survival rate of 77.8 % at 24°C respectively.
    Description: Published
    Keywords: Stress ; Survival ; Unsaturated Fatty Acid ; N-3 HUFA ; Feeding ; Larvae ; Fish ; Artemia urmiana ; Oncorhynchus mykiss ; Growth ; Fatty Acid
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.123-129
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  • 66
    Publication Date: 2021-05-19
    Description: The effects of using n-3 LC-PUFA -enriched Artemia nauplii and newly hatched Artemia on survival and resistance to pH stress in larvae of angel fish (Peterophylum scalar) were examined In tow 20 days period. In the first step of the experiment the larvae with an average weight of 0.86 ±0.03mg were fed with tow diets (enriched Artemia nauplii and newly hatched Artemia) for 20 days. At the end of the first step of the experiment, the significantly (p〈0.05) higher survival rate was observed in larvae fed with enriched Artemia (90.66%) than the larvae fed with newly hatched Artemia (83.66%). In the second step of the experiment the larvae with an average weight of 20. 03 ±3.73mg were fed only with commercial diet for 20 days. At the end of the second 20th days of the experiment, larvae exposed at pH stress (including 5.5, 6.5, 8.8 and 9.5) for 96 hours. The Result showed that the larvae were fed with n-3 LC-PUFA-enriched Artemia have a higher significant survival rate than other group in the period of the experiment and pH stress (p〈0.05). Therefore, using of n-3 LC-PUFA-enriched Artemia recommended for increasing survival rate and the resistance to pH stress.
    Description: Published
    Keywords: Artemia urmiana ; LC-PUFA ; Peterophylum scalar ; Angel fish ; PH ; Larvae ; Stress ; Survival ; Diets
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.75-86
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  • 67
    Publication Date: 2021-11-20
    Description: This study was conducted the effect of stress on blood glucose and cortisol levels in cultured great sturgeon. Blood sampling was done and then water level decreased to the half in experimental tanks. The fish were exposed in that situation and second blood sampling was taken after 6 hours. Glucose and cortisol concentrations were measured by glucose oxidase method and Radioimmunoassay (RIA), respectively. The results showed that average of cortisol concentration reached from 10.8 ± 3.3 to 14.6 ± 9.0 ng ml-1 (P〈0.05). Indeed, average of glucose concentration was 56.4 ± 12.0 pre-stress exposures and reached to 111.6 ± 17.5 mg dl-1 post-stress (P〈0.05). Stress is most often associated with a negative perspective. We recommend for increasing efficiency in rearing, should avoid of stressors possibly that it needs to right management on rearing practice and this action causes to increase in production, fish welfare, restoration and economic efficiency.
    Description: Published
    Keywords: Cortisol ; Glucose ; Handling ; Great Sturgeon (Huso huso) ; Stress ; responses ; Sturgeon ; Air ; Huso huso
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.99-103
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  • 68
    Publication Date: 2022-05-26
    Description: © The Author(s), 2017. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Conservation Physiology 5 (2017): cox061, doi:10.1093/conphys/cox061.
    Description: Recent studies have demonstrated that some hormones are present in baleen powder from bowhead (Balaena mysticetus) and North Atlantic right (Eubalaena glacialis) whales. To test the potential generalizability of this technique for studies of stress and reproduction in large whales, we sought to determine whether all major classes of steroid and thyroid hormones are detectable in baleen, and whether these hormones are detectable in other mysticetes. Powdered baleen samples were recovered from single specimens of North Atlantic right, bowhead, blue (Balaenoptera [B.]musculus), sei (B. borealis), minke (B. acutorostrata), fin (B. physalus), humpback (Megaptera novaeangliae) and gray (Eschrichtius robustus) whales. Hormones were extracted with a methanol vortex method, after which we tested all species with commercial enzyme immunoassays (EIAs, Arbor Assays) for progesterone, testosterone, 17β-estradiol, cortisol, corticosterone, aldosterone, thyroxine and tri-iodothyronine, representing a wide array of steroid and thyroid hormones of interest for whale physiology research. In total, 64 parallelism tests (8 species × 8 hormones) were evaluated to verify good binding affinity of the assay antibodies to hormones in baleen. We also tested assay accuracy, although available sample volume limited this test to progesterone, testosterone and cortisol. All tested hormones were detectable in baleen powder of all species, and all assays passed parallelism and accuracy tests. Although only single individuals were tested, the consistent detectability of all hormones in all species indicates that baleen hormone analysis is likely applicable to a broad range of mysticetes, and that the EIA kits tested here perform well with baleen extract. Quantification of hormones in baleen may be a suitable technique with which to explore questions that have historically been difficult to address in large whales, including pregnancy and inter-calving interval, age of sexual maturation, timing and duration of seasonal reproductive cycles, adrenal physiology and metabolic rate.
    Description: This work was supported by (1) the Center for Bioengineering Innovation at Northern Arizona University and (2) the New England Aquarium.
    Keywords: Baleen ; Cetaceans ; Hormones ; Marine mammals ; Reproduction ; Stress
    Repository Name: Woods Hole Open Access Server
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  • 69
    Publication Date: 2022-05-26
    Description: © The Author(s), 2017. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Endangered Species Research 34 (2017): 417-429, doi:10.3354/esr00866.
    Description: As human impacts on marine ecosystems escalate, there is increasing interest in quantifying sub-lethal physiological and pathological responses of marine mammals. Glucocorticoid hormones are commonly used to assess stress responses to anthropogenic factors in wildlife. While obtaining blood samples to measure circulating hormones is not currently feasible for free-swimming large whales, immunoassay of fecal glucocorticoid metabolites (fGCs) has been validated for North Atlantic right whales Eubalaena glacialis (NARW). Using a general linear model, we compared fGC concentrations in right whales chronically entangled in fishing gear (n = 6) or live-stranded (n = 1), with right whales quickly killed by vessels (n = 5) and healthy right whales (n = 113) to characterize fGC responses to acute vs. chronic stressors. fGCs in entangled whales (mean ± SE: 1856.4 ± 1644.9 ng g-1) and the stranded whale (5740.7 ng g-1) were significantly higher than in whales killed by vessels (46.2 ± 19.2 ng g-1) and healthy whales (51.7 ± 8.7 ng g-1). Paired feces and serum collected from the live-stranded right whale provided comparison of fGCs in 2 matrices in a chronically stressed whale. Serum cortisol and corticosterone in this whale (50.0 and 29.0 ng ml-1, respectively) were much higher than values reported in other cetaceans, in concordance with extremely elevated fGCs. Meaningful patterns in fGC concentration related to acute vs. chronic impacts persisted despite potential for bacterial degradation of hormone metabolites in dead whales. These results provide biological validation for using fGCs as a biomarker of chronic stress in NARWs.
    Description: This research was funded by the NOAA/NMFS, Office of Naval Research Marine Mammals and Biology Program, Northeast Consortium, Island Foundation, Irving Oil, NEAq Internal Research Fund, Prescott Grant NA08NMF4390590, and NOAA CINAR Cooperative Agreement NA09OAR4320129.
    Keywords: North Atlantic right whale ; Stress ; Glucocorticoids ; Fecal hormones ; Entanglement
    Repository Name: Woods Hole Open Access Server
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  • 70
    Publication Date: 2022-05-26
    Description: © The Author(s), 2017. This is the author's version of the work. It is posted here under a nonexclusive, irrevocable, paid-up, worldwide license granted to WHOI. It is made available for personal use, not for redistribution. The definitive version was published in General and Comparative Endocrinology 254 (2017): 50-59, doi:10.1016/j.ygcen.2017.09.009.
    Description: Research into stress physiology of mysticete whales has been hampered by difficulty in obtaining repeated physiological samples from individuals over time. We investigated whether multi-year longitudinal records of glucocorticoids can be reconstructed from serial sampling along full-length baleen plates (representing ~10 years of baleen growth), using baleen recovered from two female North Atlantic right whales (Eubalaena glacialis) of known reproductive history. Cortisol and corticosterone were quantified with immunoassay of subsamples taken every 4 cm (representing ~60 d time intervals) along a full-length baleen plate from each female. In both whales, corticosterone was significantly elevated during known pregnancies (inferred from calf sightings and necropsy data) as compared to intercalving intervals; cortisol was significantly elevated during pregnancies in one female but not the other. Within intercalving intervals, corticosterone was significantly elevated during the first year (lactation year) and/or the second year (post-lactation year) as compared to later years of the intercalving interval, while cortisol showed more variable patterns. Cortisol occasionally showed brief high elevations (“spikes”) not paralleled by corticosterone, suggesting that the two glucocorticoids might be differentially responsive to certain stressors. Generally, immunoreactive corticosterone was present in higher concentration in baleen than immunoreactive cortisol; corticosterone:cortisol ratio was usually 〉4 and was highly variable in both individuals. Further investigation of baleen cortisol and corticosterone profiles could prove fruitful for elucidating long-term, multi-year patterns in stress physiology of large whales, determined retrospectively from stranded or archived specimens.
    Description: This work was supported by the Eppley Foundation for Research, the NOAA Marine Mammal Health and Stranding Program, the Woods Hole Oceanographic Institution Ocean Life Institute, and the New England Aquarium.
    Keywords: Marine mammals ; Cetacea ; Baleen hormones ; Cortisol ; Corticosterone ; Stress
    Repository Name: Woods Hole Open Access Server
    Type: Preprint
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  • 71
    Publication Date: 2022-05-26
    Description: © The Author(s), 2016. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Frontiers in Marine Science 3 (2016): 232, doi:10.3389/fmars.2016.00232.
    Description: The reactive oxygen species (ROS) superoxide has been implicated in both beneficial and detrimental processes in coral biology, ranging from pathogenic disease resistance to coral bleaching. Despite the critical role of ROS in coral health, there is a distinct lack of ROS measurements and thus an incomplete understanding of underpinning ROS sources and production mechanisms within coral systems. Here, we quantified in situ extracellular superoxide concentrations at the surfaces of aquaria-hosted Porites astreoides during a diel cycle. High concentrations of superoxide (~10's of nM) were present at coral surfaces, and these levels did not change significantly as a function of time of day. These results indicate that the coral holobiont produces extracellular superoxide in the dark, independent of photosynthesis. As a short-lived anion at physiological pH, superoxide has a limited ability to cross intact biological membranes. Further, removing surface mucus layers from the P. astreoides colonies did not impact external superoxide concentrations. We therefore attribute external superoxide derived from the coral holobiont under these conditions to the activity of the coral host epithelium, rather than mucus-derived epibionts or internal sources such as endosymbionts (e.g., Symbiodinium). However, endosymbionts likely contribute to internal ROS levels via extracellular superoxide production. Indeed, common coral symbionts, including multiple strains of Symbiodinium (clades A to D) and the bacterium Endozoicomonas montiporae LMG 24815, produced extracellular superoxide in the dark and at low light levels. Further, representative P. astreoides symbionts, Symbiodinium CCMP2456 (clade A) and E. montiporae, produced similar concentrations of superoxide alone and in combination with each other, in the dark and low light, and regardless of time of day. Overall, these results indicate that healthy, non-stressed P. astreoides and representative symbionts produce superoxide externally, which is decoupled from photosynthetic activity and circadian control. Corals may therefore produce extracellular superoxide constitutively, highlighting an unclear yet potentially beneficial role for superoxide in coral physiology and health.
    Description: This work was supported by a Postdoctoral Fellowship from the Ford Foundation (JD), the National Science Foundation under grants OCE 1225801 (JD) and OCE 1233612 (AA), the Ocean and Climate Change Institute of the Woods Hole Oceanographic Institution (CH), a BIOS Grant in aid award (SM), the Sidney Stern Memorial Trust (CH and AA), as well as an anonymous donor.
    Keywords: Coral ; Superoxide ; Reactive oxygen species ; Photosynthesis ; Symbiodinium ; Stress
    Repository Name: Woods Hole Open Access Server
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  • 72
    Publication Date: 2021-05-19
    Description: L'utilisation des anesthesiques est une pratique tres courante dans les fermes aquacoles et lors d'etudes scientifiques faisant a l'exploration sanguine. Or, cette pratique est stressante pour le poisson et elle modifie un certain nombre de parametres sanguins en fonction de l'anesthesique, des especes et conditions du milieu. Deux essais ont ete effectues afin de connaitre l'influence du phenoxy-ethanol sur certains parametres sanguins chez le loup d'elevage Dicentrarchus labrax. L'anesthesie est consideree totale au stade IV, ce stade est atteint de 7 a 10 minutes d'exposition a une concentration de1/5000. L'augmentation tres hautement significative de la glycemie dans les deux essais demontre que l'anesthesique utilise est stressant pour le loup au stade de pre grossissement O+ et a 18 degree . Par contre il ne provoque pas de situation hypoxique pour les poissons. (DBO)
    Description: Using anaesthetics is very common in fish farming and in scientific studies based on blood exploration. This practice is stressful for fish and it introduces a change on some blood parameters. This change depends from drug, species and environmental conditions. Two trials were effected to determine phenoxy-ethanol effects on some blood parameters in the cultured sea bass Dicentrarchus labrax. Anaesthesia is considered complete at stageIV; this stage reaches between 7 to 10 minutes by 1/5000 for concentration. The high growth of glycemia in the two trials shows that anaesthetic used is stressful for the sea bass in age 0+ and at temperature of 18 degree . But this anaesthetic isn't hypoxic for fishes
    Description: Published
    Keywords: Stress ; Anesthésie ; Paramètres sanguins ; Loup ; Aquaculture ; Blood ; Biological stress ; Biological stress ; Fish physiology ; Anaesthesia ; Fish culture ; Aquaculture techniques ; Haematology ; Dicentrarchus labrax ; Marine
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp. 36-44
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  • 73
    Publication Date: 2022-05-25
    Description: Author Posting. © The Author(s), 2016. This is the author's version of the work. It is posted here by permission of American Physiological Society for personal use, not for redistribution. The definitive version was published in American Journal of Physiology - Regulatory, Integrative and Comparative Physiology 310 (2016): R596-R601, doi:10.1152/ajpregu.00512.2015.
    Description: Recent studies of stranded marine mammals indicate that exposure to underwater military sonar may induce pathophysiological responses consistent with decompression sickness (DCS). However, DCS has been difficult to diagnose in marine mammals. We investigated whether blood microparticles (MPs, measured as number/μl plasma), which increase in response to decompression stress in terrestrial mammals, are a suitable biomarker for DCS in marine mammals. We obtained blood samples from trained Steller sea lions (Eumetopias jubatus, 4 adult females) wearing time-depth recorders that dove to predetermined depths (either 5 or 50 m). We hypothesized that MPs would be positively related to decompression stress (depth and duration underwater). We also tested the effect of feeding and exercise in isolation on MPs using the same blood sampling protocol. We found that feeding and exercise had no effect on blood MP levels, but that diving caused MPs to increase. However, blood MP levels did not correlate with diving depth, relative time underwater, and presumably decompression stress―possibly indicating acclimation following repeated exposure to depth.
    Description: Funding for this project was provided by the Office of Naval Research to MM (ONR Award # N00014-12-10388) and SRT (ONR Award # N00014-13-10614). Additional support was provided by the National Oceanic and Atmospheric Administration through the North Pacific Marine Science Foundation and the North Pacific Universities Marine Mammal Research Consortium.
    Description: 2017-02-03
    Keywords: Sea lion ; Decompression ; Stress ; Apnea ; Diving ; Bubbles
    Repository Name: Woods Hole Open Access Server
    Type: Preprint
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  • 74
    Publication Date: 2022-05-25
    Description: Author Posting. © American Geophysical Union, 2015. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry, Geophysics, Geosystems 16 (2015): 2829–2847, doi:10.1002/2015GC005882.
    Description: Local and regional S-wave splitting in the offshore South Island of the New Zealand plate-boundary zone provides constraints on the spatial and depth extent of the anisotropic structure with an enhanced resolution relative to land-based and SKS studies. The combined analysis of offshore and land measurements using splitting tomography suggests plate-boundary shear dominates in the central and northern South Island. The width of this shear zone in the central South Island is about 200 km, but is complicated by stress-controlled anisotropy at shallow levels. In northern South Island, a broader (〉200 km) zone of plate-boundary parallel anisotropy is associated with the transitional faulting between the Alpine fault and Hikurangi subduction and the Hikurangi subduction zone itself. These results suggest S-phases of deep events (∼90 km) in the central South Island are sensitive to plate-boundary derived NE-SW aligned anisotropic media in the upper-lithosphere, supporting a “thin viscous sheet” deformation model.
    Description: United States National Ocean Bottom Seismograph Instrumentation Pool
    Description: 2016-02-29
    Keywords: Anisotropy ; Deformation ; Tomography ; S-wave splitting ; Plate-boundary ; Stress
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 75
    Publication Date: 2022-05-25
    Description: Author Posting. © Inter-Research, 2009. This article is posted here by permission of Inter-Research for personal use, not for redistribution. The definitive version was published in marine Ecology Progress Series 376 (2009): 123-132, doi:10.3354/meps07812.
    Description: The induction and regulation of heat shock proteins (hsps) is a significant defense mechanism that can preserve metabolic function and foster recovery from short-term stress events. Present coral sampling methodologies that involve hsp analysis often require the harvesting of large samples of live coral colonies that may already be stressed or in poor health. In the present study, 3 novel protocols were developed to: (1) extract single coral polyps, minimizing colony trauma; (2) purify protein from single coral polyps (approximately 12 mm3); and (3) develop a more sensitive protein quantification method. The preliminary testing of 5 separate protein preparation methods resulted in a range of total protein yields from 47 to 77 µg coral polyp–1. The optimized methods were able to recover, on average, 44 ± 12 µg protein polyp–1 (n = 20). Subsequent SDS-PAGE and immunoblotting analysis of single coral polyps resolved as little as 87 pg hsp70 coral polyp–1. This minimally invasive sampling protocol reduces coral damage and, thus, reduces stress and diseases caused by sampling.
    Description: This research was funded by a grant from the National Oceanic and Atmospheric Administration’s Undersea Research Center at the University of North Carolina at Wilmington pursuant to NOAA Award Number NA03OAR4300088.
    Keywords: Coral ; Heat stock proteins ; hsp ; Polyp ; Proteins ; Stress
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 76
    Publication Date: 2017-04-03
    Description: Fractures in AND-2A drillcore were documented in this study. Over 4100 fractures of all types were logged. A population of 510 steeply-dipping, petal, petal-centreline and core-edge induced fractures is present, reaching a maximum density of c. 10 fractures/metre. Subhorizontal induced extension fractures are also abundant. There are 1008 natural fractures in the core, including faults, brecciated zones, veins and sedimentary intrusions. Kinematic indicators document dominant normal faulting, although reverse faults are also present. The natural fractures occur in strata ranging in age from the Miocene to the Plio-Pleistocene.
    Description: Published
    Description: 69-76
    Description: 3.2. Tettonica attiva
    Description: N/A or not JCR
    Description: open
    Keywords: Fractures ; Downhole logging ; Drillcore ; Stress ; Antarctica ; Drilling ; 04. Solid Earth::04.02. Exploration geophysics::04.02.05. Downhole, radioactivity, remote sensing, and other methods ; 04. Solid Earth::04.04. Geology::04.04.09. Structural geology ; 04. Solid Earth::04.07. Tectonophysics::04.07.99. General or miscellaneous ; 04. Solid Earth::04.07. Tectonophysics::04.07.05. Stress ; 04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 77
    Publication Date: 2022-05-25
    Description: Author Posting. © American Meteorological Society, 2007. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Atmospheric and Oceanic Technology 24 (2007): 102-116, doi:10.1175/JTECH1953.1.
    Description: Measurements of the vertical Reynolds stress components in the wave-dominated nearshore are required to diagnose momentum and turbulence dynamics. Removing wave bias from Reynolds stress estimates is critical to a successful diagnosis. Here two existing Reynolds stress estimation methods (those of Trowbridge, and Shaw and Trowbridge) for wave-dominated environments and an extended method (FW) that is a combination of the two are tested with a vertical array of three current meters deployed in 3.2-m water depth off an ocean beach. During the 175-h-long experiment the instruments were seaward of the surfzone and the alongshore current was wind driven. Intercomparison of Reynolds stress methods reveals that the Trowbridge method is wave bias dominated. Tests of the integrated cospectra are used to reject bad Reynolds stress estimates, and the Shaw and Trowbridge estimates are rejected more often than FW estimates. With the FW method, wave bias remains apparent in the cross-shore component of the Reynolds stress. However, the alongshore component of Reynolds stress measured at the three current meters are related to each other with a vertically uniform first EOF containing 73% of the variance, indicating the presence of a constant stress layer. This is the first time the vertical structure of Reynolds stress has been measured in a wave-dominated environment. The Reynolds stress is, albeit weakly, related to the wind stress and a parameterized bottom stress. Using derived wave bias and bottom stress parameterizations, the effect of wave bias on Reynolds stress estimates is shown to be weaker for more typical surfzone conditions (with both stronger waves and currents than those observed here).
    Description: Funded by NSF, ONR, and NOPP.
    Keywords: Waves, oceanic ; Stress ; Sensors
    Repository Name: Woods Hole Open Access Server
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  • 78
    Publication Date: 2022-05-25
    Description: Author Posting. © American Geophysical Union, 2004. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 109 (2004): B10404, doi:10.1029/2003JB002925.
    Description: Postseismic deformation is well documented in geodetic data collected in the aftermath of large earthquakes. In the postseismic time interval, GPS is most sensitive to creep in the lower crust or upper mantle activated by earthquake-generated stress perturbations. In these regions, deformation may be localized on an aseismic frictional surface or on a ductile shear zone. These two hypotheses imply specific rheologies and therefore time dependence of postseismic creep. Hence postseismic creep constitutes a potential probe into the rheology of aseismic regions of the lithosphere. I present a simple shear zone model of postseismic creep in which the rheology of the creeping element can be varied. In the absence of tectonic loading during the postseismic time interval, the displacement history of the shear zone obeying a power law rheology with stress exponent n follows an analytical relaxation curve parameterized by 1/n. For a frictional surface, postseismic creep follows the same relaxation law in the limit 1/n → 0. A rough estimate of the apparent stress exponent can be obtained from continuous GPS records. Application to data collected after the 1994 Sanriku earthquake yields 1/n ∼ 0.1, which is consistent with dislocation creep mechanisms. However, the records of two other subduction zone events, the 2001 Peru event and the 1997 Kronotski earthquake, and a continental strike-slip earthquake, the 1999 İzmit earthquake, require negative 1/n. Rather than characterizing the shear zone rheology, these negative exponents indicate that reloading of the shear zone by tectonic forces is important. Numerical simulations of postseismic deformation with nonnegligible reloading produce curves that are well fit by the generalized relaxation law with 1/n 〈 0, although the actual stress exponent of the rheology is positive. While this prevents rheology from being tightly constrained by the studied GPS records, it indicates that reloading is important in the postseismic time interval. In other words, the stress perturbation induced by an earthquake is comparable to the stress supported by ductile shear zones in the interseismic period.
    Description: This work was supported by the Postdoctoral Scholar Program at the Woods Hole Oceanographic Institution, with funding provided by the USGS, complemented by NSF grants OCE- 9907244, OCE-0327588, EAR-0337678, and a grant from the Deep Ocean Exploration Institute at WHOI to Greg Hirth.
    Keywords: Postseismic ; Rheology ; Stress
    Repository Name: Woods Hole Open Access Server
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  • 79
    Publication Date: 2017-04-04
    Description: Dikes within stratovolcanoes are commonly expected to have radial patterns. However, other patterns may also be found, due to regional stresses, magmatic reservoirs and topographic variations. Here, we investigate dike patterns within volcanic edifices by studying dike and fissure complexes at Somma-Vesuvius and Etna (Italy) using analogue models. At the surface, the dikes and fissures show a radial configuration. At depths of tens to several hundreds of metres, in areas exposed by erosion, tangential and oblique dikes are also present. Analogue models indicate that dikes approaching the flanks of cones, regardless of their initial orientation, reorient to become radial (parallel to the maximum gravitational stress). This re-orientation is a significant process in shallow magma migration and may also control the emplacement of dikefed fissures reaching the lower slopes of the volcano.
    Description: This work was partly financed with DPC-INGV LAVA Project.
    Description: Published
    Description: 219-223
    Description: 1.5. TTC - Sorveglianza dell'attività eruttiva dei vulcani
    Description: 3.2. Tettonica attiva
    Description: 3.5. Geologia e storia dei vulcani ed evoluzione dei magmi
    Description: 3.6. Fisica del vulcanismo
    Description: 4.3. TTC - Scenari di pericolosità vulcanica
    Description: JCR Journal
    Description: reserved
    Keywords: Dike propagation ; Central volcanic edifices ; Stress ; 04. Solid Earth::04.01. Earth Interior::04.01.03. Mantle and Core dynamics ; 04. Solid Earth::04.04. Geology::04.04.99. General or miscellaneous ; 04. Solid Earth::04.04. Geology::04.04.09. Structural geology ; 04. Solid Earth::04.07. Tectonophysics::04.07.99. General or miscellaneous ; 04. Solid Earth::04.07. Tectonophysics::04.07.05. Stress ; 04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics ; 04. Solid Earth::04.08. Volcanology::04.08.99. General or miscellaneous ; 04. Solid Earth::04.08. Volcanology::04.08.02. Experimental volcanism ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring ; 04. Solid Earth::04.08. Volcanology::04.08.08. Volcanic risk ; 05. General::05.02. Data dissemination::05.02.03. Volcanic eruptions ; 05. General::05.08. Risk::05.08.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 80
    Publication Date: 2017-04-04
    Description: Several fundamental questions concerning: i) the geophysical and geochemical processes controlling normal faulting and earthquake ruptures during moderate-to-large seismic events and ii) the low angle normal fault paradox, still need to be fully answered. In this work we aim to present an example of low angle normal fault (Alto Tiberina Fault) located in the Northern Apennines (Italy) showing conclusive evidence of its seismic activity. This fault is a likely target of an international project: the MOLE (Multidisciplinary Observatory and Laboratory of Experiments) Drilling project. Indeed, under the auspices of the International Continental Scientific Drilling Program a workshop is being organized in Italy next spring 2008, to promote the creation of an international multidisciplinary team of scientists, to discuss the project in detail and also to prepare a full proposal for ICDP. This project wants to investigate the inner structure of normal faults in Central Italy to get physical constraints on the processes controlling faulting and earthquake mechanics. The Umbria-Marche sector of Northern Apennines offers a unique opportunity to reach a complex system of normal faults among which we selected two possible targets. 1) The active Colfiorito fault dipping about 45° toward SW which Tiberina low angle normal fault dipping 15°-25° towards ENE, which moves through a combination of aseismic creep and repeating microearthquakes. Drilling the Colfiorito active fault at a depth of about 2-3 km allows targeting the high coseismic slip patch of the 1997 earthquake M=6 seismogenic structure. Drilling the Alto Tiberina Fault at a depth of nearly 5-6 km will target a micro seismicity source. We aim to collect new original data through borehole logging and sampling and to set up a permanent observatory at depth for a multidisciplinary monitoring to characterize these active normal fault zones. This will allow to understand how such faults behave and to create more realistic models of: earthquake nucleation, seismicity pattern, stress interactions and earthquake triggering at local and regional scale. Both drilling targets present relevant technical issues that should be discussed from different points of view before selecting the starting drilling site.
    Description: Published
    Description: San Francisco, CA (USA)
    Description: 3.2. Tettonica attiva
    Description: open
    Keywords: Drilling ; Alto Tiberina Fault ; Seismicity ; Stress ; North Apennines ; Central Italy ; LANF ; 04. Solid Earth::04.07. Tectonophysics::04.07.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Poster session
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  • 81
    Publication Date: 2017-04-04
    Description: The application of mechanical stress on rock sample can stimulate elecric and electromagnetic signal emission. Such emissions can be detected experimentally. In this work, experiments that show up Electric and Electromagnetic signal emissions during the application of mechanical stress with various modes, are described. The experimental results manifest that such Electric and Electromagnetic signals can be used as precursors of the upcoming failure.
    Description: Published
    Description: Cambridge, UK
    Description: 3.8. Geofisica per l'ambiente
    Description: open
    Keywords: Electric signals ; electromagnetic precursors ; Pressure ; Stress ; Rocks ; 04. Solid Earth::04.01. Earth Interior::04.01.04. Mineral physics and properties of rocks
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Conference paper
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  • 82
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    In:  Geophys. Res. Lett., Taipei, Elsevier, vol. 33, no. 7, pp. 1144-1157, pp. L07301, (ISBN: 0-12-018847-3)
    Publication Date: 2006
    Keywords: Stress ; Coulomb ; Seismicity ; Aftershocks ; triggering ; SAF ; Fault zone ; USA ; GRL ; 7209 ; Seismology: ; Earthquake ; dynamics ; (1242) ; 7215 ; Earthquake ; source ; observations ; (1240) ; 7223 ; Earthquake ; interaction, ; forecasting, ; and ; prediction ; (1217, ; 1242) ; 7230 ; Seismicity ; and ; tectonics ; (1207, ; 1217, ; 1240, ; 1242) ; 8015 ; Structural ; Geology: ; Local ; crustal ; structure
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  • 83
    Publication Date: 2006
    Keywords: Fault zone ; NAFZ ; Stress ; Coulomb ; Structural geology ; JGR ; Cagatay ; Goeruer ; Gorur ; Marmara ; Sea ; multibeam ; bathymetry ; fault ; bends ; seafloor ; rupture ; Izmit ; earthquake ; 3045 ; Marine ; Geology ; and ; Geophysics: ; Seafloor ; morphology, ; geology, ; and ; geophysics ; 7221 ; Seismology: ; Paleoseismology ; (8036) ; 7250 ; Transform ; faults ; 8111 ; Tectonophysics: ; Continental ; tectonics: ; strike-slip ; and ; transform ; 8150 ; Plate ; boundary: ; general ; (3040)
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  • 84
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    In:  J. Geophys. Res., Luxembourg, Pergamon, vol. 111, no. B5, pp. 305-314, pp. B05309, (ISBN 1-86239-117-3)
    Publication Date: 2006
    Keywords: Stress ; Fault zone ; Structural geology ; Modelling ; Inelastic ; Rheology ; cycles ; JGR ; step ; over ; 7209 ; Seismology: ; Earthquake ; dynamics ; (1242) ; 7223 ; Earthquake ; interaction, ; forecasting, ; and ; prediction ; (1217, ; 1242) ; 7260 ; Theory ; 7290 ; Computational ; seismology ; 7215 ; Earthquake ; source ; observations ; (1240)
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  • 85
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    In:  Bulletin of the Seismological Society of America, Münster, Inst. f. Geophys., Ruhr-Univ. Bochum, vol. 96, no. 3, pp. 871-878, pp. B04310, (ISBN: 0534351875, 2nd edition)
    Publication Date: 2006
    Keywords: Seismology ; Seismicity ; long ; distance ; Stress ; BSSA
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  • 86
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    In:  Geophys. Res. Lett., Amsterdam, Univ. Tokyo, vol. 33, no. 17, pp. 551-557, pp. L17313, (ISSN: 1340-4202)
    Publication Date: 2006
    Keywords: Stress ; Aftershocks ; Earthquake ; Statistical investigations ; CFF ; GRL ; 7209 ; Seismology: ; Earthquake ; dynamics ; (1242) ; 7212 ; Earthquake ; ground ; motions ; and ; engineering ; seismology ; 7223 ; Earthquake ; interaction, ; forecasting, ; and ; prediction ; (1217, ; 1242) ; 7230 ; Seismicity ; and ; tectonics ; (1207, ; 1217, ; 1240, ; 1242)
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  • 87
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    In:  Geophys. Res. Lett., Amsterdam, Univ. Tokyo, vol. 33, no. 14, pp. 16,341-16,358, pp. L14309, (ISSN: 1340-4202)
    Publication Date: 2006
    Keywords: Three dimensional ; Finite Element Method ; Modelling ; Stress ; Crustal deformation (cf. Earthquake precursor: deformation or strain) ; Tectonics ; GRL ; 3215 ; Mathematical ; Geophysics: ; Instability ; analysis ; 8005 ; Structural ; Geology: ; Folds ; and ; folding ; 8020 ; Mechanics, ; theory ; and ; modeling ; 8109 ; Tectonophysics: ; Continental ; tectonics: ; extensional ; (0905)
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  • 88
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    In:  Geophysical Journal International, Luxembourg, Conseil de l'Europe, vol. 165, no. 2, pp. 622-640, pp. B12408, (ISSN: 1340-4202)
    Publication Date: 2006
    Keywords: Statistical investigations ; Modelling ; Inhomogeneity ; Source ; Stress ; fault ; slip, ; inhomogeneous ; media, ; statistical, ; methods, ; stress ; distribution, ; Lavallee ; GJI
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  • 89
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    In:  Nature, San Francisco, Pergamon, vol. 441, no. 7094, pp. 704-705, pp. 1447, (ISSN: 1340-4202)
    Publication Date: 2006
    Keywords: Stress ; Coulomb ; Aftershocks ; Dynamic ; Friction ; Seismicity ; Rheology
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  • 90
    Publication Date: 2006
    Keywords: Friction ; Earthquake ; Geothermics ; Japan ; Subduction zone ; Tsunami(s) ; Stress ; EPSL ; paleogeothermal ; structure ; vitrinite ; reflectance ; fault ; rocks ; pseudotachylyte
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  • 91
    Publication Date: 2006
    Keywords: Tomography ; Seismics (controlled source seismology) ; Stress ; Earthquake ; Rheology ; Japan ; JGR ; 7230 ; Seismology: ; Seismicity ; and ; tectonics ; 7270 ; Tomography ; 8164 ; Tectonophysics: ; Stresses: ; crust ; and ; lithosphere ; 8012 ; Structural ; Geology: ; High ; strain ; deformation ; zones ; 8015 ; Local ; crustal ; structure
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  • 92
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    In:  Geophys. Res. Lett., Amsterdam, 4, vol. 33, no. 8, pp. 1-4, pp. L08302, (ISSN: 1340-4202)
    Publication Date: 2006
    Keywords: Structural geology ; Fault zone ; SAF ; USA ; Seismicity ; Stress ; GRL ; 7230 ; Seismology: ; Seismicity ; and ; tectonics ; 8031 ; Structural ; Geology: ; Rheology: ; crust ; and ; lithosphere ; 8020 ; Mechanics, ; theory, ; and ; modeling ; 8111 ; Tectonophysics: ; Continental ; tectonics: ; strike-slip ; and ; transform ; 8118 ; Dynamics ; and ; mechanics ; of ; faulting
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  • 93
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    In:  J. Geophys. Res., Zagreb, 3-4, vol. 111, no. B6, pp. 1-11, pp. B06305, (ISSN: 1340-4202)
    Publication Date: 2006
    Keywords: Stress ; Coulomb ; Seismicity ; Friction ; Rock mechanics ; JGR ; earthquake ; triggering ; stress ; heterogeneity ; rate ; and ; state ; friction ; 7209 ; Seismology: ; Earthquake ; dynamics ; 7215 ; Earthquake ; source ; observations ; 7223 ; Earthquake ; interaction, ; forecasting, ; and ; prediction
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  • 94
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    In:  Seism. Res. Lett., Reykjavík, Icelandic Meteorological Office, Ministry for the Environment University of Iceland, vol. 77, no. 1, pp. 3-6, pp. TC1011, (ISSN 0016-8548, ISBN 3-510-50045-8)
    Publication Date: 2006
    Keywords: Seismology ; Earthquake precursor: prediction research ; Stress ; Coulomb ; Modelling ; Seismicity ; red ; silent ; slow ; tremor ; Subduction zone ; Source ; Fault plane solution, focal mechanism ; Moment tensor ; Seismic networks ; Data analysis / ~ processing ; SRL
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  • 95
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    In:  Tectonophys., Chengdu, Sichuan, China, 4, vol. 426, no. 1-2, pp. 221-238, pp. B02303, (ISSN: 1340-4202)
    Publication Date: 2006
    Keywords: Stress ; Three dimensional ; Inelastic ; Rheology ; Dearth Core ; Borehole geophys. ; Strain ; Great ; depth ; Isotropic ; rock ; Japan ; Kwasniewski
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  • 96
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    In:  Tectonophys., Stuttgart, Pergamon, vol. 423, no. 3-4, pp. 271-289, pp. L13613, (ISSN: 1340-4202)
    Publication Date: 2006
    Keywords: Dislocation ; Modelling ; Rheology ; Crustal deformation (cf. Earthquake precursor: deformation or strain) ; Stress ; Coulomb ; Inelastic ; Fault zone ; NAF ; Martin ; Turkey ; viscosity ; FROTH ; RWANG
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  • 97
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    In:  Ann. Rev. Earth Planet. Sci., Ottawa, 3-4, vol. 34, no. 5, pp. 263-291, pp. 1214, (ISSN: 1340-4202)
    Publication Date: 2006
    Keywords: Volcanology ; remote ; long ; distance ; Stress ; Seismicity ; ANREV
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  • 98
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    In:  J. Geophys. Res., Luxembourg, Conseil de l'Europe, vol. 111, no. B3, pp. ETG 7-1 to ETG 7-15, pp. B03409, (ISSN: 1340-4202)
    Publication Date: 2006
    Keywords: Stress ; Crustal deformation (cf. Earthquake precursor: deformation or strain) ; silent ; red ; Earthquake ; Japan ; Kalman ; filter ; Volcanology ; Subduction zone ; JGR ; crustal ; deformation ; Global Positioning System ; slow ; slip ; event ; Tokai ; transient ; deformation ; 1243 ; Geodesy ; and ; Gravity: ; Space ; geodetic ; surveys ; 7215 ; Seismology: ; Earthquake ; source ; observations ; (1240) ; 8150 ; Tectonophysics: ; Plate ; boundary: ; general ; (3040)
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  • 99
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    In:  Geophys. Res. Lett., Zagreb, Conseil de l'Europe, vol. 33, no. 2, pp. 441-445, pp. L02307, (ISSN 0343-5164)
    Publication Date: 2006
    Keywords: Crustal deformation (cf. Earthquake precursor: deformation or strain) ; Stress ; Rheology ; Non-linear effects ; Maxwell ; Two-dimensional ; Finite Element Method ; Modelling ; Earthquake ; South ; America ; GIK ; GRL ; 1207 ; Geodesy ; and ; Gravity: ; Transient ; deformation ; (6924, ; 7230, ; 7240) ; 1242 ; Seismic ; cycle ; related ; deformations ; (6924, ; 7209, ; 7223, ; 7230) ; 7230 ; Seismology: ; Seismicity ; and ; tectonics ; (1207, ; 1217, ; 1240, ; 1242) ; 8123 ; Tectonophysics: ; Dynamics: ; seismotectonics ; 8164 ; Stresses: ; crust ; and ; lithosphere
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  • 100
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    In:  Tectonophysics, Luxembourg, Conseil de l'Europe, vol. 413, no. 1-2, pp. 39-52, pp. B02405, (ISSN: 1340-4202)
    Publication Date: 2006
    Keywords: Stress ; Coulomb ; AMR ; Seismicity ; Accelerating ; moment ; release ; Seismicity ; rates ; Landers ; Stress ; accumulation
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