Consulta: subjectFacets:"Hypoxia"
Registros recuperados: 95
Data/hora: 13/06/2024 00:29:11

Oxygen depletion in the gulf of Mexico adjacent to the Mississippi river
Provedor de dados: 72
Autores: Rabalais,Nancy N.
The seasonal formation of a bottom-water layer severely depleted in dissolved oxygen has become a perennial occurrence on the Louisiana continental shelf adjacent to the Mississippi River system. Dramatic changes have occurred in this coastal ecosystem in the last half of the 20th century as the loads of dissolved inorganic nitrogen tripled. There are increases in primary production, shifts in phytoplankton community composition, changes in trophic interactions, and worsening severity of hypoxia. The river-influenced continental shelf is representative of similar ecosystems in which increased nutrient flux to the coastal ocean has resulted in eutrophication and subsequently hypoxia. The hypoxic conditions (dissolved oxygen less than 2 mg L-1) cover up to...
Tipo: Journal article
Palavras-chave: Anoxia; Hypoxia; Eutrophication; Nutrients; Nitrogen.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000300015

Ecophysiology, genotoxicity, histopathology, and gene responses of naphthalene injected Colossoma macropomum (Cuvier, 1818) exposed to hypoxia
Provedor de dados: 74
Autores: Souza,Samara Silva de; Silva,Grazyelle Sebrenski da; Almeida-Val,Vera Maria Fonseca de.
Abstract The present study aimed to evaluate the biological responses of Colossoma macropomum to naphthalene injection and subsequent hypoxia exposure, emphasizing the expression of the tumor suppressor gene tp53. Tambaquis were intraperitoneally injected with naphthalene (50 mg/kg) and, after 96 hours, the fish were transferred to respirometry chambers and, submitted to progressive hypoxia for the determination of critical PO2. In a subsequent experiment, the fish received an intraperitoneal injection of naphthalene and were kept for 96 hours under normoxia. Successively, fish were challenged with acute hypoxia (PO2&lt;PO2 crit) during 6 hours. We observed that the PO2 crit was not affected by naphthalene injection. Moreover, hematological parameters were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Naphthalene; Hypoxia; Tumor suppressor gene tp53; DNA damage; Tambaqui.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572019000300411

Anoxia- and hypoxia-induced expression of LDH-A* in the Amazon Oscar, Astronotus crassipinis
Provedor de dados: 74
Autores: Almeida-Val,Vera Maria Fonseca; Oliveira,Alice Reis; Silva,Maria de Nazaré Paula da; Ferreira-Nozawa,Monica Stropa; Araújo,Roziete Mendes; Val,Adalberto Luis; Nozawa,Sérgio Ricardo.
Adaptation or acclimation to hypoxia occurs via the modulation of physiologically relevant genes, such as erythropoietin, transferrin, vascular endothelial growth factor, phosphofructokinase and lactate dehydrogenase A. In the present study, we have cloned, sequenced and examined the modulation of the LDH-A gene after an Amazonian fish species, Astronotus crassipinis (the Oscar), was exposed to hypoxia and anoxia. In earlier studies, we have discovered that adults of this species are extremely tolerant to hypoxia and anoxia, while the juveniles are less tolerant. Exposure of juveniles to acute hypoxia and anoxia resulted in increased LDH-A gene expression in skeletal and cardiac muscles. When exposed to graded hypoxia juveniles show decreased LDH-A...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon; Fishes; Gene expression; RT-PCR; LDH-A; Hypoxia; Anoxia.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572011000200025

Моделирование возникновения и распространения гипоксии на мелководье
Provedor de dados: 13
Autores: Васечкина, Е. Ф.; Ярин, В. Д.
Имитируется ситуация развития гипоксии в период весенне-летнего прогрева на мелководье. Исследуется пространственно-временная динамика процесса. Используется объектно-ориентированная модель планктонного сообщества пелагиали, дополненная гидрохимическим блоком, который описывает циклы азота и серы в аэробных и анаэробных условиях. Гидродинамика системы описывается интегральной двухслойной моделью, учитывающей влияние атмосферной изменчивости на развитие процесса. Моделируется реакция живых компонентов системы на смену режима в нижнем слое с окислительного на восстановительный и обратно.
Tipo: Journal Contribution
Palavras-chave: Гипоксия; Цикл азота и серы; Аэробно-анаэробные условия; Пространственная неоднородность планктона; Объектно-ориентированное моделирование; Hypoxia; Nitrogen cycle; Sulfur cycle; Aerobic and anaerobic conditions; Spatial; Object-oriented modeling Spatial variations Nitrogen cycle Hypoxia Nitrogen cycle Hypoxia http://aims.fao.org/aos/agrovoc/c_27938 http://aims.fao.org/aos/agrovoc/c_24472.
Ano: 2006
URL: http://repository.ibss.org.ua/dspace/handle/99011/294

Влияние гидрологических  условий на  изменчивость гидрохимических и гидробиологических характеристик вод Одесского региона северо-западной части Черного моря
Provedor de dados: 13
Autores: Тучковенко, Ю. С.; Доценко, С. А.; Дятлов, С. Е.; Нестерова, Д. А.; Скрипник, И. А.; Кирсанова, Е. В.
На основе данных экологического мониторинга Одесского региона северо-западной части Черного моря описано влияние особенностей гидрологических условий и явлений на изменчивость гидрохимических и гидробиологических характеристик вод акватории. Показано, что проникновение языка распресненных вод из Днепро-Бугского лимана весной и прибрежный ветровой апвеллинг в весенне-летний период года способствуют углублению процесса эвтрофирования вод и развитию гипоксии в прибрежной зоне.
Tipo: Journal Contribution
Palavras-chave: Гидрологические условия; Гидрохимический режим; Эвтрофикация; Гипоксия; Одесский регион; Черное море; Hydrological conditions; Hydrochemical regime; Еutrophication; Hypoxia; Odessa Region; Black Sea Hypoxia Hypoxia http://aims.fao.org/aos/agrovoc/c_24472.
Ano: 2004
URL: http://repository.ibss.org.ua/dspace/handle/99011/136

Эритрограмма циркулирующей крови скорпены в условиях экспериментальной гипоксии
Provedor de dados: 13
Autores: Парфенова, И. А.; Солдатов, А. А.
В экспериментальных условиях исследовано влияние гипоксии (концентрация Сь в воде - 1.7 - 1.8 мг л') на морфометрические характеристики циркулирующей эритроцитарной массы у черноморской скорпены (Scorpaena porcus L.). Показано, что в условиях дефицита кислорода происходит рост среднеклеточного объ­ема, увеличение размеров ядер эритроцитов и их ядерно-плазматических отношений. Данные изменения за­трагивают более 50 % клеток. В крови повышается содержание малодифференцированных эрнтроидных форм: базофильных и полихроматофильных нормобластов. Обсуждаются процессы, лежащие в основе дан­ных изменений.
Tipo: Journal Contribution
Palavras-chave: Гипоксия; Эритрограмма крови; Цитометрия эритроцитов; Эритроцитарные индексы; Рыбы; Hypoxia; Blood erythrogram; Erythrocyte sizes; Erythrocyte indexes; Fish Erythrocytes Hypoxia Blood Erythrocytes Hypoxia Blood http://aims.fao.org/aos/agrovoc/c_2659 http://aims.fao.org/aos/agrovoc/c_24472 http://aims.fao.org/aos/agrovoc/c_959.
Ano: 2005
URL: http://repository.ibss.org.ua/dspace/handle/99011/206

Влияние краткосрочной гипоксии на некоторые ростовые показатели черноморской мидии в условиях дефицита пищи
Provedor de dados: 13
Autores: Щербань, С. А.; Вялова, О. Ю.
Исследованы особенности динамики содержания белка, суммарных РНК, ДНК и индекса РНК/ДНК в тканях мидий под влиянием 1- и 4-суточной гипоксии и голодания. Показано, что содержание белка и суммарной РНК в жабрах и гепатопанксреасе снижалось в среднем на 30 - 50 % от контрольного уровня. 4-суточная гипоксия приводила к увеличению в 15,5 раз концентрации аммонийного азота в воде.
Tipo: Journal Contribution
Palavras-chave: Hypoxia; Growth; Hypoxia; Growth; Http://aims.fao.org/aos/agrovoc/c_24472; Http://aims.fao.org/aos/agrovoc/c_3394.
Ano: 2001
URL: http://repository.ibss.org.ua/dspace/handle/99011/566

Роль ветрового прибрежного апвеллинга в возникновении гипоксии в Одесском регионе северо-западной части Черного моря
Provedor de dados: 13
Autores: Тучковенко, Ю. С.; Доценко, С. А.; Никаноров, В. А.; Савин, П. Т.
На основе данных двенадцатилетнего (1988 - 1999 гг.) гидрохимического и гидрологического мониторинга обнаружена связь явления ветрового прибрежного апвеллинга с развитием придонной гипоксии в прибрежной зоне Одесского региона северо-западной части Черного моря.
Tipo: Journal Contribution
Palavras-chave: Hypoxia; Hypoxia; Http://aims.fao.org/aos/agrovoc/c_24472.
Ano: 2003
URL: http://repository.ibss.org.ua/dspace/handle/99011/487

Consommation d'oxygene de la crevette japonaise, Penaeus japonicus , en fonction de l'oxygenation du milieu: Effects de la temperature et de l'acclimatation a des conditions ambiantes hypoxiques
Provedor de dados: 5
Autores: Truchot, J; Jouve, D.
Oxygen consumption of juvenile prawns, Penaeus japonicus , was measured during the day at 4 temperatures (23, 26, 30 and 33 degree C) and at various oxygenation levels. For inactive prawns burrowed into sand, respiratory metabolism was maintained almost constant in hypoxia above a critical oxygen pressure of about 30-40 Torr. Data analysis according to a hyperbolic model indicates that the capacity for metabolic regulation was optimal between 26 and 30 degree C. Prawns acclimated 1-2 weeks at 20 degree C in moderate hypoxia (P sub(O2) around 50-55 Torr) showed a reinforced regulation of oxygen consumption when compared to normoxic controls.
Tipo: Text
Palavras-chave: Penaeus japonicus; Malacostraca; Juveniles; Respiration; Hypoxia; Dissolved oxygen; Temperature effects; Oxygen consumption; Crevettes Pénaeides; Température; Hypoxie; Métabolisme respiratoire.
Ano: 1983
URL: http://archimer.ifremer.fr/doc/1983/acte-1192.pdf

Regulation of a truncated isoform of AMP-activated protein kinase alpha (AMPKalpha) in response to hypoxia in the muscle of Pacific oyster Crassostrea gigas
Provedor de dados: 5
Autores: Guevelou, Eric; Huvet, Arnaud; Sussarellu, Rossana; Milan, Massimo; Guo, Xinmei; Li, Li; Zhang, Guofan; Quillien, Virgile; Daniel, Jean-yves; Quere, Claudie; Boudry, Pierre; Corporeau, Charlotte.
AMP-activated protein kinase α (AMPKα) is a key regulator of energy balance in many model species during hypoxia. In a marine bivalve, the Pacific oyster Crassostrea gigas, we analyzed the protein content of adductor muscle in response to hypoxia during 6 h. In both smooth and striated muscles, the amount of full-length AMP-activated protein kinase α (AMPKα) remained unchanged during hypoxia. However, hypoxia induced a rapid and muscle-specific response concerning truncated isoforms of AMPKα. In the smooth muscle, a truncated isoform of AMPKα was increased from 1 to 6 h of hypoxia, and was linked with accumulation of AKT kinase, a key enzyme of the insulin signaling pathway which controls intracellular glucose metabolism. In this muscle, aerobic metabolism...
Tipo: Text
Palavras-chave: Marine bivalve; Crassostrea gigas; Hypoxia; AMP-activated protein kinase; Alternative splicing; Adductor muscle.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00119/22998/21397.pdf

Identification of Hypoxia-Regulated Genes in the Liver of Common Sole (Solea solea ) Fed Different Dietary Lipid Contents
Provedor de dados: 5
Autores: Mazurais, David; Ferraresso, Serena; Gatta, Pier Paolo; Desbruyeres, Elisabeth; Severe, Armelle; Corporeau, Charlotte; Claireaux, Guy; Bargelloni, Luca; Zambonino, Jose-luis.
Coastal systems could be affected by hypoxic events brought about by global change. These areas are essential nursery habitats for several fish species including the common sole (Solea solea L.). Tolerance of fish to hypoxia depends on species and also on their physiological condition and nutritional status. Indeed, high dietary lipid content has been recently shown to negatively impact the resistance of sole to a severe hypoxic challenge. In order to study the molecular mechanisms involved in the early response to hypoxic stress, the present work examined the hepatic transcriptome in common sole fed diets with low and high lipid content, exposed to severe hypoxia. The activity of AMP-activated protein kinase (AMPK) was also investigated through the...
Tipo: Text
Palavras-chave: Fish; Hypoxia; Nutrition; Liver; Transcriptome; AMPK.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00169/28062/26474.pdf

Effects of oil exposure and dispersant use upon environmental adaptation performance and fitness in the European sea bass, Dicentrarchus labrax
Provedor de dados: 5
Autores: Claireaux, Guy; Theron, Michael; Prineau, Michel; Dussauze, Matthieu; Merlin, Francois Xavier; Le Floch, Stephane.
The worldwide increasing recourse to chemical dispersants to deal with oil spills in marine coastal ecosystems is a controversial issue. Yet, there exists no adequate methodology that can provide reliable predictions of how oil and dispersant-treated oil can affect relevant organism or population-level performance. The primary objective of the present study was to examine and compare the effects of exposure to untreated oil (weathered Arabian light crude oil), chemically dispersed oil (Finasol, TOTAL-Fluides) or dispersant alone, upon the ability of fish for environmental adaptation. To reach that goal, we implemented high-throughput, non-lethal challenge tests to estimate individual hypoxia and heat tolerance as surrogate measures of their capacity to...
Tipo: Text
Palavras-chave: Oil-spill; Dispersant; Fish; Temperature; Hypoxia; Survival; Growth; Environmental adaptation ability; Darwinian fitness.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00137/24831/23045.pdf

Impact of urban effluents on summer hypoxia in the highly turbid Gironde Estuary, applying a 3D model coupling hydrodynamics, sediment transport and biogeochemical processes
Provedor de dados: 5
Autores: Lajaunie-salla, Katixa; Wild-allen, Karen; Sottolichio, Aldo; Thouvenin, Benedicte; Litrico, Xavier; Abril, Gwenael.
Estuaries are increasingly degraded due to coastal urban development and are prone to hypoxia problems. The macro-tidal Gironde Estuary is characterized by a highly concentrated turbidity maximum zone (TMZ). Field observations show that hypoxia occurs in summer in the TMZ at low river flow and a few days after the spring tide peak. In situ data highlight lower dissolved oxygen (DO) concentrations around the city of Bordeaux, located in the upper estuary. Interactions between multiple factors limit the understanding of the processes controlling the dynamics of hypoxia. A 3D biogeochemical model was developed, coupled with hydrodynamics and a sediment transport model, to assess the contribution of the TMZ and the impact of urban effluents through wastewater...
Tipo: Text
Palavras-chave: Hypoxia; TMZ; Gironde Estuary; Wastewater; Oxygen; Modeling.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00388/49903/50475.pdf

Hypoxia tolerance of common sole juveniles depends on dietary regime and temperature at the larval stage: evidence for environmental conditioning
Provedor de dados: 5
Autores: Zambonino, Jose-luis; Claireaux, Guy; Ernande, Bruno; Quazuguel, Patrick; Severe, Armelle; Huelvan, Christine; Mazurais, David.
An individual's environmental history may have delayed effects on its physiology and life history at later stages in life because of irreversible plastic responses of early ontogenesis to environmental conditions. We chose a marine fish, the common sole, as a model species to study these effects, because it inhabits shallow marine areas highly exposed to environmental changes. We tested whether temperature and trophic conditions experienced during the larval stage had delayed effects on life-history traits and resistance to hypoxia at the juvenile stage. We thus examined the combined effect of global warming and hypoxia in coastal waters, which are potential stressors to many estuarine and coastal marine fishes. Elevated temperature and better trophic...
Tipo: Text
Palavras-chave: Fish; Environmental programming; Climate change; Hypoxia; Nutrition.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00127/23858/21810.pdf

When do phytoplankton blooms cause the most intense hypoxia in the northern Adriatic Sea?
Provedor de dados: 5
Autores: Legovic, T; Justic, D.
Eutrophication of the northern Adriatic Sea was investigated using data on dissolved oxygen (DO) from 1911 to 1982. Beginning in the period 1955-1965, DO concentrations increased in the surface layer and decreased close to the bottom in all seasons except winter. These changes are attributed to an increase of the anthropogenic nutrient inflow. The occurrence of hypoxia near the bottom and its disappearance were investigated using the vertical distribution of DO on the transect from the Po delta to Rovinj during 1973. Horizontal distributions of DO close to the surface and near the bottom show prominent gradients from the Po delta towards the middle of the northern Adriatic Sea. Application of a simple box model indicates that phytoplankton blooms which...
Tipo: Text
Palavras-chave: Hypoxia; Phytoplankton blooms; Nutrients; Eutrophication; Adriatic Sea.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/00093/20451/18123.pdf

Metabolic response to hypoxia in European sea bass (Dicentrarchus labrax) displays developmental plasticity
Provedor de dados: 5
Autores: Cadiz, Laura; Zambonino-infante, Jose-luis; Quazuguel, Patrick; Madec, Lauriane; Le Delliou, Herve; Mazurais, David.
Several physiological functions in fish are shaped by environmental stimuli received during early life. In particular, early-life hypoxia has been reported to have long-lasting effects on fish metabolism, with potential consequences for fish life history traits. In the present study, we examine whether the synergistic stressors hypoxia (40% and 100% air saturation) and temperature (15° and 20 °C), encountered during early life, could condition later metabolic response in European sea bass (Dicentrarchus labrax) juveniles. Growth rate and metabolic parameters related to carbohydrate and lipid metabolism in the liver were investigated at the juvenile stage under normoxic and chronic hypoxic conditions. Juvenile growth rates were significantly lower...
Tipo: Text
Palavras-chave: Hypoxia; Developmental plasticity; Metabolism; European sea bass.
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00404/51536/52126.pdf

Modulation des performances cardio-respiratoires du bar europeen (Dicentrarchus labrax) par l'apport d'acides gras alimentaires: une etude integree des effets cardiaques in vivo au courant calcique de type L des myocytes ventriculaires
Provedor de dados: 5
Autores: Chatelier, Aurelien.
Diet quality, and particularly fatty acids composition, is an environmental factor that is emerging as a significant source of physiological diversity. Indeed, numerous recent studies show that the fatty acid composition of the diet influences cardiac and metabolic performances of organisms. Because it is involved in the control and regulation of internal flow of matter and energy, the heart is believed to play a central role in environmental adaptation in fish. Within the double context of adaptation of individuals to their ecological niche and species evolution, understanding sources of interindividual variability and particularly fatty acid influences on the cardiorespiratory system is essential.  The objective of the study was to investigate in the sea...
Tipo: Text
Palavras-chave: Dicentrarchus labrax; Arythmie cardiaque; Hypoxie; Acide oléique; Canal calcique de type L; Calcium; Nage; Métabolisme; Coeur; Acides gras; Dicentrarchus labrax; Cardiac arrhythmias; Hypoxia; Oleic acid; L type calcium channel; Calcium; Metabolism; Heart; Fatty acid.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/these-2197.pdf

Comparative effects of long-term hypoxia on growth, feeding and oxygen consumption in juvenile turbot and European sea bass
Provedor de dados: 5
Autores: Pichavant, Karine; Person, Jeannine; Le Bayon, Nicolas; Severe, Armelle; Le Roux, Annick; Boeuf, Gilles.
When juvenile turbot Scophthulmus maximus and sea bass Dicentrarchus labrax were fed to satiation, growth and food intake were depressed under hypoxia (3.2 +/- 0.3 and 4.5 +/- 0.2 mg O-2 l(-1)). However, no significant difference in growth was observed between fishes maintained in hypoxia and fed to satiation and fishes reared in normoxia (7.4 +/- 0.3 mg O-2 l(-1)) and fed restricted rations (same food intake of fishes at 3.2 mg O-2 l(-1)). Routine oxygen consumption of fishes fed to satiation was higher in normoxia than in hypoxia due to the decrease in food intake in the latter. Of the physiological parameters measured, no significant changes were observed in the two species maintained in hypoxia. This study confirms the significant interaction between...
Tipo: Text
Palavras-chave: Oxygen consumption; Growth; Hypoxia; Sea bass; Turbot.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/publication-617.pdf

Effects of hypoxia and elevated ammonia concentration on the viability of red snapper embryos and early larvae
Provedor de dados: 5
Autores: Bardon-albaret, Agnes; Saillant, Eric.
The effects of hypoxic conditions and elevated ammonia concentrations on the viability of embryos and newly hatched larvae of the red snapper (Lutjanus campechanus) were investigated. In all experiments, tested levels of hypoxia or ammonia concentrations were applied to embryos and unfed newly hatched larvae from three different spawns. Exposures began at 1 h post fertilization (pf) and lasted until all individuals in a group had expired. Survival rates were monitored daily in duplicates for each spawn in each treatment. Fertilized eggs exposed to 2 mg L− 1 dissolved oxygen (29% saturation) showed complete mortality before hatch while 81% of embryos in control groups (&gt; 85% saturation) hatched and subsequently maintained high survival until 5 days pf....
Tipo: Text
Palavras-chave: Lutjanus campechanus; Hypoxia; Ammonia; Egg quality; Stress; Water quality.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00321/43188/42735.pdf

Metabolomics based on UHPLC-QToF- and APGC-QToF-MS reveals metabolic pathways reprogramming in response to tidal cycles in the sub-littoral species Mimachlamys varia exposed to aerial emergence
Provedor de dados: 5
Autores: Ory, Pascaline; Bonnet, Antoine; Mondeguer, Florence; Breitwieser, Marine; Dubillot, Emmanuel; Graber, Marianne.
Mimachlamys varia is a sub-littoral bivalve encountered from Norway to the Mediterranean Sea, which lives mostly byssally attached to rocks. During the low tide period, M. varia individuals, located highest on the shore, may experience short time of aerial exposure and face a low availability of oxygen. Here we report a comparative metabolomic profiling of gill samples of M. varia obtained by both LC-QToF and APGC-QToF mass spectrometry, to analyze metabolic changes occurring during emersion in comparison with immersion. Scallops were grown in aquaria with a simulated intertidal environment mimicking short-duration air exposure that they might experience during extreme tides: alternating 2 h emersion and 10 h immersion. Our results show a switch from...
Tipo: Text
Palavras-chave: Anaerobic; APGC-QToF mass spectrometry; Hypoxia; Intertidal; LC-QToF mass spectrometry; Metabolomics; Mimachlamys varia; PLS-DA.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00466/57741/59936.pdf

Les risques conchylicoles en Baie de Quiberon. Troisième partie : le risque d’hypoxie pour l’huître creuse Crassostrea gigas. Rapport final du projet Risco 2010-2013
Provedor de dados: 5
Autores: Stanisiere, Jean-yves; Mazurie, Joseph; Bouget, Jean-francois; Langlade, Aime; Gabellec, Raoul; Retho, Michael; Quinsat, Kevin; Leclerc, Emilie; Cugier, Philippe; Dussauze, Morgan; Menesguen, Alain; Dumas, Franck; Gohin, Francis; Augustin, Jean-marie; Ehrhold, Axel; Sinquin, Jean-marc; Goubert, Evelyne; Dreano, Alain.
The project “Risco”, supported by the “Pôle Mer” and funded by the Regional Council of Brittany, deals with specific risks of mortality of oysters, Crassostrea gigas, cultivated on the bottom, in a subtidal bay of South Brittany : the bay of Quiberon (56, France). Massive mortalities of oysters were reported in summer 2006 in this bay, exclusively located in the deep muddy area with a positive gradient eastward. A validated biogeochemical model was applied in order to simulate the dissolved oxygen over 2000-2006 : it revealed several episodes of hypoxia, more or less intense according to years, but with the same spatial distribution. This approach proved 2006 to be the most hypoxic year since 2000. The hypoxia was due to a rare conjunction of 3 factors :...
Tipo: Text
Palavras-chave: Baie Quiberon; Crassostrea gigas; Huître; Mortalité; Croissance; Hypoxie; Oxygène; Modèle; Upwelling; Loire; Vilaine; Quiberon; Crassostrea gigas; Oyster; Mortality; Growth; Hypoxia; Oxygen; Model; DEB; Upwelling; Loire; Vilaine.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00180/29131/27535.pdf

Effets des caractéristiques physico-chimiques et biorhéologiques de l'eau sur la physiologie, les performances adaptatives et la sélection de l'habitat chez la sole commune Solea solea (Linnaeus, 1758)
Provedor de dados: 5
Autores: Couturier, Christine.
Shellfish culture can lead to an accumulation of exopolysaccharides (EPS) over the surface of intertidal mudflats. EPS are rheologically active polymers that change water viscosity and water flow over the branchial basket of the juvenile flatfish that colonise intertidal mudflats. The aim of this study was to assess the impact of water EPS content on various aspects of the physiology and behaviour of the common sole Solea solea. Field studies revealed that water total EPS can be up to 15 mg l 1 in the field. In sole juveniles (aged class 0+) ventilatory distress was observed at concentrations above 4 mg l-1, and the intensity of the constraint decreased with fish size. Nonetheless, neither standard metabolic rate nor tolerance of hypoxia were influenced...
Tipo: Text
Palavras-chave: Flatfish; SDA; Growth; Habitat selection; Metabolism; Hypoxia; EPS; Viscosity; Common sole; Poissons plats; SDA; Croissance; Sélection d'habitat; Métabolisme; Hypoxie; EPS; Viscosité; Sole commune.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/these-3461.pdf

Conséquences à long terme d'une exposition précose à l'hypoxie sur la physiologie du bar européen (Dicentrarchus labrax) et de la sole commune (Solea solea)
Provedor de dados: 5
Autores: Vanderplancke, Gwenaelle.
The dissolved oxygen in seawater has steadily declined in many coastal marine ecosystems in the last 50 years because of global warming and increasing coastal human activities. This decrease in oxygen in seawater causes episodes of hypoxia increasingly frequent and severe in coastal and estuarine areas. Some organisms may escape these environmental constraints by migration or dispersion. Others, with limited swimming capabilities must implement physiological regulation (phenotypic plasticity) to enable them to adapt and survive. This is particularly the case of marine fish larvae that are likely to be present in coastal nursery at the end of their development. It is now well established that the regulations implemented by organisms to cope with their...
Tipo: Text
Palavras-chave: Hypoxie; Conditionnement; Programmation environnementale; Poissons marins; Changement climatique; Oxygène; Dicentrarchus labrax; Solea solea; Marine fish; Climate change; Oxygen; Hypoxia; Conditioning; Environmental programming.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00498/60938/64332.pdf

Trade-off between thermal sensitivity, hypoxia tolerance and growth in fish
Provedor de dados: 5
Autores: Roze, Thomas; Christen, Felix; Amerand, Aline; Claireaux, Guy.
One outcome of contemporary climate trends is that the involvement of hypoxia and heat tolerance in determining individual fitness will increase in many fish populations. Large fish are believed to be more tolerant to hypoxia than small fish (Nilsson and Ostlund-Nilsson, 2008) whereas thermal sensitivity is thought to decrease with body size (Clark et al., 2008). To better understand the bases of inter-individual variation in environmental adaptation performance, the current study examined hypoxia and heat tolerance in a fast growing (FGS; 288.3 +/- 14.4 g, 26.04 +/- 0.49 cm) and a slow growing (SGS; 119.95 +/- 6.41 g; 20.98 +/- 0.41 cm) strain of 1-year old rainbow trout (Oncorhynchus mykiss). This examination was conducted using two standardized...
Tipo: Text
Palavras-chave: Fish; Hypoxia; Temperature; Trade-off; Growth; Body size.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00130/24104/22371.pdf

Assessing chronic fish health: An application to a case of an acute exposure to chemically treated crude oil
Provedor de dados: 5
Autores: Mauduit, Florian; Domenici, P.; Farrell, A. P.; Lacroix, C.; Le Floch, S.; Lemaire, P.; Nicolas-kopec, A.; Whittington, M.; Zambonino-infante, Jose-luis; Claireaux, Guy.
Human alteration of marine ecosystems is substantial and growing. Yet, no adequate methodology exists that provides reliable predictions of how environmental degradation will affect these ecosystems at a relevant level of biological organization. The primary objective of this study was to develop a methodology to evaluate a fish’s capacity to face a well-established environmental challenge, an exposure to chemically dispersed oil, and characterize the long-term consequences. Therefore, we applied high-throughput, non-lethal challenge tests to assess hypoxia tolerance, temperature susceptibility and maximal swimming speed as proxies for a fish’s functional integrity. These whole animal challenge tests were implemented before (1 month) and after (1 month)...
Tipo: Text
Palavras-chave: Fish; Oil spill; Dispersant; Biomarkers; Physiological integrity; Ecological performance; Temperature; Hypoxia; Swimming; Growth.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00347/45828/45916.pdf

Response of the blue shrimp Litopenaeus stylirostris to temperature decrease and hypoxia in relation to molt stage
Provedor de dados: 5
Autores: Mugnier, Chantal; Soyez, Claude.
The effect of different levels of dissolved oxygen (DO) and a decreased temperature combined with severe hypoxia were studied in the blue shrimp Litopenaeus stylirostris in relation to molt stage. In the first experiment, shrimps were submitted to DO concentrations of 5 to 1 mg l(-1). Osmoregulatory capacity (OC) was measured in shrimps at molt stage C after 6, 24, or 48 h of exposure. No mortality was recorded but a significant negative effect of DO concentration on hypo-OC was observed for DO concentrations below 3 mg l(-1). Osmoregulation improved after 48 h exposure, compared to 6 and 24 h exposure.   In a second experiment, temperature was decreased from 28 to 22 degreesC in 24 h, before a severe hypoxia of 0.5+/-0.1 mg O-2 l(-1) was applied....
Tipo: Text
Palavras-chave: Temperature; Stress; Penaeid shrimp; Osmoregulation; Molt stage; Litopenaeus stylirostris; Hypoxia.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-372.pdf

Effects of hypoxia on growth and metabolism of juvenile turbot
Provedor de dados: 5
Autores: Pichavant, Karine; Person, Jeannine.
The effects of hypoxia on growth, feed efficiency, nitrogen excretion, oxygen consumption and metabolism of juvenile turbot (120 g) were studied in a 45-day experiment carried out in sea water at 17.0 +/- 0.5 degrees C and 34.5 ppt salinity. Fish were fed to satiation at O-2-concentrations of 3.5 +/- 0.3, 5.0 +/- 0.3 mg l(-1) (hypoxia) and 7.2 +/- 0.3 mg l(-1) (normoxia). Both feed intake (FI) and growth were significantly lower under hypoxia than under normoxia, with no significant differences being observed between 3.5 and 5.0 mg O-2 l(-1). During the first 2 weeks of the experiment, FI was halved under hypoxic conditions, and there were large differences among treatments in feed conversion ratio (FCR), i.e., it was 3.2, 1.5, and 0.9 in turbot exposed to...
Tipo: Text
Palavras-chave: Acid base status; Ion regulation; Nitrogen excretion; Oxygen consumption; Feed utilization; Growth; Hypoxia; Turbot.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/2000/publication-631.pdf

To boldly gulp: standard metabolic rate and boldness have context-dependent influences on risk-taking to breathe air in a catfish
Provedor de dados: 5
Autores: Mckenzie, David; Belao, Thiago C.; Killen, Shaun S.; Rantin, F. Tadeu.
The African sharptooth catfish Clarias gariepinus has bimodal respiration, it has a suprabranchial air-breathing organ alongside substantial gills. We used automated bimodal respirometry to reveal that undisturbed juvenile catfish (N=29) breathed air continuously in normoxia, with a marked diurnal cycle. Air breathing and routine metabolic rate (RMR) increased in darkness when, in the wild, this nocturnal predator forages. Aquatic hypoxia (20% air saturation) greatly increased overall reliance on air breathing. We investigated whether two measures of risk taking to breathe air, namely absolute rates of aerial O-2 uptake ((M) over dotO(2), air) and the percentage of RMR obtained from air (% (M) over dotO(2), air), were influenced by individual standard...
Tipo: Text
Palavras-chave: Bimodal respiration; Energy metabolism; Hypoxia; Personality; Respiratory partitioning; Risk-taking.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00626/73822/73663.pdf

Narrowing down the number of species requiring detailed study as candidates for the EU Common Fisheries Policy discard ban
Provedor de dados: 5
Autores: Morfin, Marie; Mehault, Sonia; Benoit, Hugues P.; Kopp, Dorothee.
By 2019, the Common Fisheries Policy will prohibit discarding in all European fisheries of any pelagic, demersal or shellfish species for which removals are managed by TACs and quotas or minimum sizes. However, the regulation allows for exemptions from the prohibition for species for which scientific evidence demonstrates high survival rates associated with discarding. Producing reliable evidence of high survival typically requires long and costly studies involving tagging or captivity. This paper proposes to use the capacity to resist air exposure, a key stressor for discarded animals, as a proxy for survival that can be used to prioritize candidate species for more in-depth discard survival studies. The time required to induce mortality (TM) in...
Tipo: Text
Palavras-chave: Landing obligation; Discard mortality; Hypoxia; Artisanal bottom trawl fishery; Bay of Biscay; English Channel.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00362/47281/49145.pdf

Environnement et jeunes stades de vie chez le poisson : la plasticité développementale comme réponse aux contraintes hypoxiques et thermiques
Provedor de dados: 5
Autores: Cadiz Barrera, Laura.
In the context of global change, decrease in oxygen availability (hypoxia) combined with rising water temperature are especially prevalent in coastal regions, towards which marine fish larvae may drift at the end of their development. It is well admitted that the physiological regulations implemented by organisms to cope with their environment during the early life stages of life can cause profound consequences in their subsequent life-history trajectory (developmental plasticity). Therefore, the main objective of this thesis was to investigate whether ecologically relevant conditions of oxygenation (40% and 100% air saturation) combined with thermic conditions (15 and 20 °C), occurring at the last stages of larval development of European sea bass...
Tipo: Text
Palavras-chave: Hypoxie; Réchauffement des océans; Physiologie; Bar Européen; Plasticité développementale; Hypoxia; Ocean warming; Physiology; European sea bass; Developmental plasticity.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00498/60973/64384.pdf

Early exposure to chronic hypoxia induces short- and long-term regulation of hemoglobin gene expression in European sea bass (Dicentrarchus labrax)
Provedor de dados: 5
Autores: Cadiz, Laura; Servili, Arianna; Quazuguel, Patrick; Madec, Lauriane; Zambonino, Jose-luis; Mazurais, David.
European sea bass (Dicentrarchus labrax) inhabits coastal waters and may be exposed to hypoxia at different life stages, requiring physiological and behavioral adaptation. In the present study, we attempted to determine whether regulation of hemoglobin (Hb) gene expression plays a role in the physiological response to chronic moderate hypoxia in whole larvae and hematopoietic tissues (head kidney and spleen) of juveniles. We also tested the hypothesis that hypoxia exposure at the larval stage could induce a long-term effect on the regulation of Hb gene expression. For this purpose, D. labrax were exposed to a non-lethal hypoxic condition (40% air saturation) at the larval stage from 28 to 50 days post-hatching (dph) and/or at the juvenile stage from 196 to...
Tipo: Text
Palavras-chave: Hypoxia; Hemoglobin; Early exposure; European sea bass.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00399/51039/51831.pdf

Modeling the impact of hypoxia on the energy budget of Atlantic cod in two populations of the Gulf of Saint-Lawrence, Canada
Provedor de dados: 5
Autores: Lavaud, Romain; Thomas, Yoann; Pecquerie, Laure; Benoit, Hugues P.; Guyondet, Thomas; Flye-sainte-marie, Jonathan; Chabot, Denis.
Like many marine species around the globe, several stocks of Atlantic cod (Gadus morhua) live in increasingly hypoxic waters. In the Gulf of Saint Lawrence (GSL) in Canada, the deep channels traversing the semi-enclosed sea exhibit year-round hypoxia, identified as one of the limiting factor for the recovery of GSL cod in its northern part. While many individuals in the northern GSL are known to venture in deeper, warmer, and more hypoxic waters of the Gulf channels, those in the southern GSL live in a shallower, colder, and more oxygenated environment. In this study, we use the modeling framework of the Dynamic Energy Budget (DEB) theory to disentangle the effects of hypoxia, temperature and food on the life-history traits of these two populations of cod...
Tipo: Text
Palavras-chave: Hypoxia; Dynamic energy budget; Atlantic cod; Growth; Temperature; Gulf of Saint-Lawrence.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00448/55966/57472.pdf

Quantified intermediate water oxygenation history of the NE Pacific: A new benthic foraminiferal record from Santa Barbara basin
Provedor de dados: 5
Autores: Ohkushi, K.; Kennett, J. P.; Zeleski, C. M.; Moffitt, S. E.; Hill, T. M.; Robert, Cyril; Beaufort, L.; Behl, R. J.
The oxygen minimum zone (OMZ) of the late Quaternary California margin experienced abrupt and dramatic changes in strength and depth in response to changes in intermediate water ventilation, ocean productivity, and climate at orbital through millennial time scales. Expansion and contraction of the OMZ is exhibited at high temporal resolution (107-126 year) by quantitative benthic foraminiferal assemblage changes in two piston cores forming a vertical profile in Santa Barbara Basin (569 m, basin floor; 481 m, near sill depth) to 34 and 24 ka, respectively. Variation in the OMZ is quantified by new benthic foraminiferal groupings and new dissolved oxygen index based on documented relations between species and water-mass oxygen concentrations....
Tipo: Text
Palavras-chave: Oxygen minimum zone; Foraminifera; Ventilation; Oxygen index; Pacific; Hypoxia.
Ano: 2013
URL: https://archimer.ifremer.fr/doc/00264/37489/35811.pdf

Assessing the long-term effect of exposure to dispersant-treated oil on fish health using hypoxia tolerance and temperature susceptibility as ecologically relevant biomarkers
Provedor de dados: 5
Autores: Mauduit, Florian; Farrell, Anthony P.; Domenici, Paolo; Lacroix, Camille; Le Floch, Stephane; Lemaire, Pphilippe; Nicolas-kopec, Annabelle; Whittington, Mark; Le Bayon, Nicolas; Zambonino-infante, Jose-luis; Claireaux, Guy.
Consequences of exposure to polyaromatic hydrocarbons (PAH), toxic components of crude oil, on fish has been widely documented due to their ecological and economical importance. However, although forming a valuable and consistent body of knowledge, use of these data in spill response is limited. Objective of the present study was thus to facilitate the translation of published data into information of operational value. For this, we investigated the dose‐response relationship between dispersant‐treated oil exposure and ecologically‐relevant consequences by combining laboratory and field experiments. Effects were examined over almost a year using juveniles of the slow growing, commercially important European sea bass (Dicentrarchus labrax). Moreover, a...
Tipo: Text
Palavras-chave: Oil spills; Polycyclic aromatic hydrocarbons (PAHs); Fish indices; Hypoxia; Temperature.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00455/56679/58438.pdf

Transcriptomic response of the Pacific oyster Crassostrea gigas to hypoxia
Provedor de dados: 5
Autores: Sussarellu, Rossana; Fabioux, Caroline; Le Moullac, Gilles; Fleury, Elodie; Moraga, Dario.
Marine intertidal organisms commonly face hypoxic stress during low tide emersion; moreover, eutrophic conditions and sediment nearness could lead to hypoxic phenomena; it is indeed important to understand the molecular processes involved in the response to hypoxia. In this study the molecular response of the Pacific oyster Crassostrea gigas to prolonged hypoxia (2 mg O-2 L-1 for 20 d) was investigated under experimental conditions. A transcriptomic approach was employed using a cDNA microarray of 9058 C. gigas clones to highlight the genetic expression patterns of the Pacific oyster under hypoxic conditions. Lines of oysters resistant (R) and susceptible (S) to summer mortality were used in this study. ANOVA analysis was used to identify the genes...
Tipo: Text
Palavras-chave: Mollusca; Hypoxia; CDNA microarray; Gene expression; Oxidative stress; Respiratory chain.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00027/13799/11053.pdf

Effects of water viscosity upon ventilation and metabolism of a flatfish, the common sole Solea solea (L.)
Provedor de dados: 5
Autores: Couturier, Christine; Rouault, Alice; Mckenzie, David; Galois, Robert; Robert, Serge; Joassard, Lucette; Claireaux, Guy.
The French Atlantic coast contains large highly productive intertidal mudflats that are colonised by juveniles of numerous flatfish species, including the common sole (Solea solea, L.). These ecosystems are also heavily exploited by the shellfish farming industry. Intensive bivalve culture is associated with substantial biodeposition (1-6 t-dw ha(-1) day(-1)), which directly or indirectly contributes to increase exopolysaccharide (EPS) concentrations at the interface between water column and seabed. EPS are long-chain molecules organised into colloids, which influence rheological properties of water, particularly viscosity. Increased water viscosity had consequences for ventilatory activity of juvenile flatfish, whereby the minimal pressure required to...
Tipo: Text
Palavras-chave: EPS; Hypoxia; Metabolism; Water viscosity; Biodeposition; Solea solea.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2801.pdf

Moderate hypoxia but not warming conditions at larval stage induces adverse carry-over effects on hypoxia tolerance of European sea bass ( Dicentrarchus labrax ) juveniles
Provedor de dados: 5
Autores: Cadiz, Laura; Ernande, Bruno; Quazuguel, Patrick; Servili, Arianna; Zambonino-infante, Jose-luis; Mazurais, David.
Environmental conditions, to which organisms are exposed during all their life, may cause possible adaptive responses with consequences in their subsequent life-history trajectory. The objective of this study was to investigate whether ecologically relevant combinations of hypoxia (40% and 100% air saturation) and temperature (15° and 20 °C), occurring during the larval period of European sea bass larvae (Dicentrarchus labrax), could have long-lasting impacts on the physiology of resulting juveniles. Hypoxic challenge tests were performed over one year to give an integrative evaluation of physiological performance. We revealed that juvenile performance was negatively impacted by hypoxia but not by the thermal conditions experienced at larval stage. This...
Tipo: Text
Palavras-chave: Hypoxia; Temperature; Developmental plasticity; Carry-over effects; Opercular malformation; European sea bass.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00434/54606/55988.pdf

Exposure to chronic moderate hypoxia impacts physiological and developmental traits of European sea bass (Dicentrarchus labrax) larvae
Provedor de dados: 5
Autores: Vanderplancke, Gwenaelle; Claireaux, Guy; Quazuguel, Patrick; Huelvan, Christine; Corporeau, Charlotte; Mazurais, David; Zambonino-infante, Jose-luis.
Since European sea bass (Dicentrarchus labrax) larvae occurred in coastal and estuarine waters at early life stages, they are likely to be exposed to reduced dissolved oxygen waters at a sensitive developmental stage. However, the effects of hypoxia at larval stage, which depend in part on fish species, remain very poorly documented in European sea bass. In the present study, the impacts of an experimental exposure to a chronic moderate hypoxia (40 % air saturation) between 30 and 38 days post-hatching on the physiological and developmental traits of European sea bass larvae were assessed. This study was based on the investigation of survival and growth rates, parameters related to energy metabolism [Citrate Synthase (CS) and Cytochrome-c Oxidase (COX)...
Tipo: Text
Palavras-chave: Hypoxia; Fish larvae; Energy metabolism; Maturation.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00253/36433/35005.pdf

Metabolic adjustments in the oyster Crassostrea gigas according to oxygen level and temperature
Provedor de dados: 5
Autores: Le Moullac, Gilles; Queau, Isabelle; Le Souchu, Pierrick; Pouvreau, Stephane; Moal, Jeanne; Le Coz, Jean-rene; Samain, Jean-francois.
The purpose of this study was to examine the responses of the oyster C. gigas to oxygen levels at subcellular and whole-organism levels. Two experiments were carried out. The first experiment was designed to measure at 15°C, 20°C and 25°C for 20 hours the clearance (CR) and oxygen consumption (OC) rates of oysters exposed at different concentrations of oxygen. The goal of this first part was to estimate the hypoxic threshold for oysters below which their metabolism shifts toward anaerobiosis, by estimating the oxygen critical point (PcO2) at 15, 20 and 25°C. The second experiment was carried out to evaluate the metabolic adaptations to hypoxia for 20 days at three temperatures: 12°C, 15°C and 20°C. The metabolic pathways were characterized by the...
Tipo: Text
Palavras-chave: Succinate; Alanine; Phosphoenolpyruvate carboxykinase; Pyruvate kinase; Temperature; Hypoxia; Oysters.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2693.pdf

An early-life hypoxia event has a long-term impact on protein digestion and growth in European sea bass juvenile.
Provedor de dados: 5
Autores: Zambonino, Jose-luis; Mazurais, David; Dubuc, Alexia; Queau, Pierre; Vanderplancke, Gwenaelle; Servili, Arianna; Cahu, Chantal; Le Bayon, Nicolas; Huelvan, Christine; Claireaux, Guy.
Ocean warming, eutrophication and consequent decrease in oxygen lead to smaller average fish size. Although such responses are well-known in an evolutionary context, involving multiple generations, it appears to be incompatible with current rapid environmental change. Rather, phenotypic plasticity could provide a means for marine fish to cope with rapid environmental changes. However, little is known about the mechanisms underlying plastic responses to environmental conditions that favour small phenotypes.  Our aim was to investigate how and why European sea bass that had experienced a short episode of moderate hypoxia during their larval stage subsequently exhibited a growth depression at the juvenile stage compared to the control group.  We examined...
Tipo: Text
Palavras-chave: Climate change; Digestive enzymes; Dicentrarchus labrax; Growth; Hypoxia; Respirometry.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00373/48407/48635.pdf

Effects of short-term environmental disturbances on living benthic foraminifera during the Pacific oyster summer mortality in the Marennes-Oléron Bay (France)
Provedor de dados: 5
Autores: Bouchet, Vincent; Debenay, Vincent; Sauriau, Pierre-guy; Radford Knoery, Joel; Soletchnik, Patrick.
Sediment cores were collected from April to August 2004 on tidal mudflats of the macrotidal Marennes-Oléron Bay (SW France), famous for the cultivation of Pacific oysters (Crassostrea gigas). The response of living (stained) benthic foraminifera to short-term biogeochemical disturbances in the sediment and overlying water, which may be involved in oyster summer mortality, was monitored. Short-term hypoxia occurred in early June, in conjunction with a sudden rise in temperature. In mid-June, the ammonia content of sediment porewater increased, leading to potentially maximal flux towards overlying waters. Foraminiferal assemblages, particularly in the topmost layer, were altered. Ammonia tepida was the most tolerant to temperature increase and hypoxic...
Tipo: Text
Palavras-chave: Marennes Oléron bay; Aquaculture; Crassostrea gigas; Intertidal; Ammonium; Hypoxia; Organic matter; Living benthic foraminifera.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2586.pdf

Editorial: Facing Marine Deoxygenation
Provedor de dados: 5
Autores: Capet, Arthur; Cook, Perran; Garcia-robledo, Emilio; Hoogakker, Babette; Paulmier, Aurelien; Rabouille, Christophe; Vaquer-sunyer, Raquel.
Tipo: Text
Palavras-chave: Marine deoxygenation; Multiple stressors; Coastal deoxygenation; Oxygen minimumzone (OMZ); Ocean dead zones; Hypoxia; Acidification.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00688/79990/82947.pdf

Reversible Effect of High Altitude on Rat Testis Morphology and Spermatogenesis: Histological and Ultrastructural Study
Provedor de dados: 77
Autores: Abdalla,Asim M; Tingari,M. D; Ali,K. Z; Rezigalla,A. A; Al-shraim,Mubarak; Eid,Refaat, A.
The study was carried out at two different altitudes in the southern region of Saudi Arabia: Abha, 2,800 meters above sea level, the high altitude (HA) area and Jazan, 40 meters above sea level the low altitude (LA) area. Following exposure to high altitude, testes of rats revealed various types of atrophy and degeneration in the seminiferous tubules and in the interstitial tissue. There was detachment of the basal laminae of the tubules and a profound decrease in cellularity. When rats were brought back to their habitat (LA) and later examined, many tubules showed normal population of cells including spermatids and spermatozoa. Well-arranged epithelium was seen in most of the seminiferous tubules of these animals, normal interstitial space and no...
Tipo: Journal article
Palavras-chave: High altitude; Low altitude; Hypoxia; Semen; Reproductive hormones.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000100023

Morphology of the Eyeball, Orbit and Retina of Atlantic Salmon (Salmo Salar) Alevins under Hypoxic Conditions
Provedor de dados: 77
Autores: Pellón,Mario; Rojas,Mariana; Saint-Pierre,Gustavo; Hartley,Ricardo; del Sol,Mariano.
It has been demonstrated that hypoxia retards the growth of fish, reduces the survival of their larvae, deforms their vertebral column, but despite this teleost fish have the ability to completely regenerate many of their tissues, particularly the retina. As we do not have enough information about the effects of hypoxia on the eyeball, orbit and retina of Atlantic salmon (Salmo salar), we propose the following objectives: 1) Compare the morphological changes of the eyeball of fish subject to hypoxia and normoxia. 2) Determine changes in the orbit structure. 3) Describe the retina of salmon alevins. 4). Recognize hypoxic cells using the anti-Hif1a antibody in the retina of alevins as a sensor. 5) Determine the Shh morphogenic expression in alevins exposed...
Tipo: Journal article
Palavras-chave: Eyeball; Orbit; Retina; Salmo salar; Hypoxia; HIF1a; Shh.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000100046

Effects of Chronic Simulated Hypobaric Hypoxia on Mouse Spermatogenesis
Provedor de dados: 77
Autores: Bustos-Obregón,Eduardo; Esveile,Christian; Contreras,Julio; Maurer,Inge; Sarabia,Luis.
Reduction of O2 delivery to tissues damage them, including the seminiferous epithelium. Recently, population working in high altitude has increased, so that the study of hypobaric hypoxia on spermatogenesis becomes of interest. In this study we used two groups of male, sexually mature mice Control (C) (540 meters above sea level (masl)) and chronic simulated hypobaric hypoxia (CSHH) (4,600 masl) exposed during 8, 16, 24 or 33 days. Hematocrit; reticulocytosis; testicular, epididymal and seminal vesicle weight; seminiferous epithelium height, tubular diameter, sperm count and morphology and testicular parenchyme and spermatozoa membranes lipoperoxidation were measured. Weight of testis, epididymis and seminal vesicle were reduced but they recuperate at 33...
Tipo: Journal article
Palavras-chave: Hypoxia; Lipoperoxidation; Mouse; Testis.
Ano: 2006
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022006000400030

Vertebral Column Deformity and Hypoxia in Salmo salar
Provedor de dados: 77
Autores: Castro Sánchez,Rodrigo; Bustos Obregón,Eduardo; Rojas Rauco,Mariana.
Vertebral Column Deformity (VCD) is a common pathology in Chilean salmon farms, lowering the quality and commercialization of the product. Hypoxia has been related to other musculoskeletal deformities, but not to VCD. This work analyzes the morphology of the vertebral column of Salmo salar alevins, cultured under hypoxic conditions (60% O2 saturation in the water tanks) for different time periods after hatching (2, 4, 6 and 8 days). They are compared with their normoxic controls (100% O2 saturation). Using histological (H/E), and morphometric techniques, it was found that the time of exposure to hypoxia is inversely proportional to the body length, notochordal diameter and thickness of its sheath. The organic response to hypoxia was quantified by...
Tipo: Journal article
Palavras-chave: Vertebral Column; Deformity; Hypoxia; Salmon.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000400036

The Effects of Progesterone on Hypoxic Ischemic Injuries in the Cornu Ammonis (CA) Region of the Hippocampus of Neonatal Rats
Provedor de dados: 77
Autores: Khan,Aaijaz Ahmed; Ramli,Norhida Binti; Ismail,Zulizhar Mohd.
Hypoxia-ischemia (HI) is a major cause of brain damage in the newborn. Several studies elicited the neuroprotective effects of progesterone in adult rats but there is very little literature available on neonatal rats. Therefore the present study is undertaken to see the effect of progesterone in hypoxic ischemic brain injury in neonatal rats, using an established neonatal HI rat pup model. Seven-day-old rat pups were subjected to right common carotid artery ligation and then 60 minutes hypoxia. The first dose of progesterone to treatment group was administered by peritoneal injection (4 mg/kg), after 10 minutes of exposure and subsequent doses were given by subcutaneous injection at 6 h, 24 h and 48 h intervals. Control group was also exposed to HI and was...
Tipo: Journal article
Palavras-chave: Cornu Ammonis; Hippocampus; Hypoxia; Ischemia; Neonatal rats; Neuroprotective; Progestrone; Pyramidal cell.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000300025

Effect of High Altitude Hypoxia on the Postnatal Development of Rat Testis: Histological and Histometric Study
Provedor de dados: 77
Autores: Mohammed,Heitham Mutwakil; Tingari,M. D.
The study was carried out at two different altitudes in the southern region of Saudi Arabia: Abha, 2,800 meters above sea level, the high altitude (HA) area and Jazan, 40 meters above sea level the low altitude (LA) area. Following exposure to high altitude, and up to the third week of postnatal development, some of the seminiferous tubules showed detachment from the basal lamina, spaces of different sizes within the epithelial layer with vacuoles in the center and Pyknotic nuclei were noted in the spermatogonia and primordial germ cells. Rounded spermatids were seen in the lumen only on day 35 of hypoxic group, no spermatozoa were recognized until day 45 of postnatal development. On day 45 hypoxic rat testes revealed various types of atrophy and...
Tipo: Journal article
Palavras-chave: High altitude; Low altitude; Hypoxia.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000200031

Dermal lip protuberances associated with aquatic surface respiration in juveniles of the piscivorous characid Salminus brasiliensis (Actinopterygii: Characidae)
Provedor de dados: 83
Autores: Scarabotti,Pablo A.; Julieta Parma,M.; López,Javier A.; Ghirardi,Romina.
Some South American freshwater fishes can improve their capability of aquatic surface respiration (ASR) by developing dermal lip protuberances in the lower jaw. This adaptation was thought to be limited to omnivorous or herbivorous fishes. The present work provides the first evidence that juveniles of a piscivorous characid, Salminus brasiliensis, develop dermal lip protuberances during periods of hypoxia in floodplain ponds of the Salado River, in Argentina. The protuberance of S. brasiliensis involves dermal portions of both jaws exhibiting lateral lobes on the sides of the mouth arranged in the vertical plane. Water dissolved oxygen concentrations less than or equal to 1.05 mgl-1 were associated with a remarkable increase in lip protuberance. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hypoxia; Morphological adaptation; Lip extension; Floodplain pond; Argentina.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000300013

Effects of extended absence of flooding on the fish assemblages of three floodplain lagoons in the middle São Francisco River, Brazil
Provedor de dados: 83
Autores: Pompeu,Paulo dos Santos; Godinho,Hugo Pereira.
In the Neotropics, a large proportion of fish communities of large rivers use floodplain as habitats for feeding, reproduction, and refuge. An evaluation was made of the effects of extended dry periods on the species richness, abundance and local extinction of fish species in three marginal lagoons in the middle São Francisco River, southeastern Brazil. The studied lagoons fail to receive river floods during the study period (1994-1996). A gradual reduction in richness and abundance was observed in all lagoons. Migratory fish species had the highest probability to become extinct in the two lagoons that remained with large water volume. Species tolerant to low levels of dissolved oxygen had the lowest probability of local extinction in the lagoon showing an...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Floodplain; Migratory fish; Extended drought; Hypoxia.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252006000400006

Cross-shelf biogeochemical characteristics of sediments in the central Benguela and their relationship to overlying water column hypoxia
Provedor de dados: 20
Autores: Monteiro, P.M.S.; Van Der Plas, Anja; Pascall, A.
Data from two cross-shelf sediment sampling cruises were used to explain reasons for the sediment biogeochemical variability in respect of carbon, nitrogen and sulphur, and how the cycling of these elements governs the biogeochemistry of the overlying water through their control of the redox conditions. The spatial extent of this benthic–pelagic flux link is limited to the innershelf mud belt system on the Namibian shelf. The inshore mud belt is the primary deposition area of the carbon and nitrogen new production export flux. The offshore organic-rich zones are thought to be relict particulate organic matter originating from the inshore mud belt rather than from an overlying pelagic source. These data were used to set up a multi-layer sediment model that...
Tipo: Journal Contribution
Palavras-chave: Anoxia; Carbon; Hypoxia; Modelling; Sediments; Carbon; Anoxia; Hypoxia; Http://aims.fao.org/aos/agrovoc/c_1301; Http://aims.fao.org/aos/agrovoc/c_8831; Http://aims.fao.org/aos/agrovoc/c_24472.
Ano: 2007
URL: http://hdl.handle.net/1834/2129

Leaf plasticity in successive selection cycles of 'Saracura' maize in response to periodic soil flooding
Provedor de dados: 86
Autores: Souza,Thiago Corrêa de; Magalhães,Paulo César; Pereira,Fabrício José; Castro,Evaristo Mauro de; Silva Junior,Jessé Marques da; Parentoni,Sidney Neto.
The objective of this work was to assess the effect of successive selection cycles on leaf plasticity of 'Saracura' maize BRS-4154 under periodical flooding in field conditions. Soil flooding started at the six-leaf stage with the application of a 20-cm depth water layer three times a week. At flowering, samples of leaves were collected and fixed. Paradermic and transverse sections were observed under photonic microscope. Several changes were observed throughout the selection cycles, such as modifications in the number and size of the stomata, higher amount of vascular bundles and the resulting decrease of the distance between them, smaller diameter of the metaxylem, decrease of cuticle and epidermis thickness, decrease of number and size of bulliform...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Hypoxia; Leaf anatomy; Tolerance to flooding.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2010000100003

Morphological and Biochemical Alterations of Paddy Rice in Response to Stress Caused by Herbicides and Total Plant Submersion
Provedor de dados: 87
Autores: MARCHEZAN,M.G.; AVILA,L.A.; AGOSTINETTO,D.; SCHAEDLER,C.E.; LANGARO,A.C.; OLIVEIRA,C.; ZIMMER,M.; SCHREIBER,F.
ABSTRACT Herbicide selectivity in paddy rice varies in several aspects, among which are the environmental conditions. The aim of the study was to evaluate the effect of herbicide application and total plant submersion on morphological and biochemical changes in paddy rice. Total chlorophyll and carotenoids, catalase activity, ascorbate peroxidase and superoxide dismutase, total phenolic content, lipid peroxidation and hydrogen peroxide levels were assessed. Leaf samples were collected 24 hours and 7 days after the application of water regimes. The results observed in the first experiment show that cultivars Puitá INTA CL, IRGA 417 and IRGA 422 CL are more tolerant to total submersion. The most sensitive cultivars are IRGA 424, BRS Querência, EPAGRI 108 and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oxidative stress; Hypoxia; Oryza sativa; Herbicide selectivity.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100201

An Analysis of the Role of Tile-Drained Farmland Under Alternative Nitrogen Abatement Policies
Provedor de dados: 31
Autores: Petrolia,   Daniel R.; Gowda,   Prasanna H.
Agricultural nitrogen is a major contributor to Gulf of Mexico hypoxia, and research has shown that agricultural subsurface tile drainage is a major carrier of nitrogen from croplands to streams and rivers. This study compares the results of abating nitrogen under a retired-land minimization policy with those of a new revenue-maximizing policy, paying particular attention to the role of tile-drained land. Findings reveal the retirement-minimizing policy resulted in more tile-drained land being retired and less being fertilizer-managed than was optimal under the net-return maximizing policy. Also, it led to a greater economic burden being shouldered by tile-drained land. Under both cases, tile drainage dominated the abatement process.
Tipo: Journal Article
Palavras-chave: Abatement; ADAPT; Drainage; Hypoxia; Nitrogen; Crop Production/Industries; Land Economics/Use.
Ano: 2006
URL: http://purl.umn.edu/8621

Agricultural Drainage and Gulf Hypoxia: Economic Targeting of Farmland to Reduce Nitrogen Loads in a Minnesota Watershed
Provedor de dados: 31
Autores: Petrolia,   Daniel R.; Gowda,   Prasanna H.; Mulla,   David J.
Agricultural nitrogen losses are the major contributor to nitrogen loads in the Mississippi River, and consequently, to the existence of a hypoxic, or "dead", zone in the Gulf of Mexico.  Focusing on two small agricultural watersheds in southwestern Minnesota, simulation results from the Agricultural Drainage And Pesticide Management (ADAPT) model were combined with a linear-optimization model to evaluate the environmental and economic impact of alternative land-use policies for reducing nitrogen losses.  Of particular importance was the study's explicit focus on agricultural subsurface (tile) drainage, which has been identified as the major pathway for agricultural nitrogen losses in the upper Midwest, and the use of drainage-focused abatement policies....
Tipo: Conference Paper or Presentation
Palavras-chave: Drainage; Hypoxia; ADAPT; Nitrogen; Watershed; Environmental Economics and Policy.
Ano: 2005
URL: http://purl.umn.edu/19416

Flooding effects in seedlings of Cytharexyllum myrianthum Cham. and Genipa americana L.: responses of two neotropical lowland tree species
Provedor de dados: 88
Autores: ANDRADE,ANTÔNIO CARLOS SILVA DE; RAMOS,FLAVIO NUNES; SOUZA,ALEXANDRE FADIGAS DE; LOUREIRO,MARTA BRUNO; BASTOS,RODRIGO.
Six-month-old seedlings of Cytharexyllum myrianthum and Genipa americana, two common tree species in different flood-prone areas in Brazil, were flooded for up to 90 days to compare their survival and growth responses under these conditions. Seedlings of both species were found to be relatively tolerant to flooding but growth responses changed according to treatment and plant species. Growth of G. americana was reduced by flooding, showing a decrease in root and leaf dry mass, root/shoot ratio and height, without showing any adaptive morphological changes. On the other hand, growth of C. myrianthum seedlings was stimulated under flooding conditions, showing an increase in root dry mass, root/shoot ratio, height, stem diameter and some morphological changes...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anaerobiosis; Environmental stress; Growth; Hypoxia; Submergence.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84041999000500009

Anatomia ecológica de Sebastiania commersoniana (Baillon) Smith &amp;amp; Downs (Euphorbiaceae) submetida ao alagamento
Provedor de dados: 88
Autores: KOLB,ROSANA M.; MEDRI,MOACYR E.; BIANCHINI,EDMILSON; PIMENTA,JOSÉ A.; GILONI,PATRICIA C.; CORREA,GERALDO T.
Em matas ciliares da Bacia Hidrográfica do Rio Tibagi, nas áreas sujeitas a inundações periódicas, é comum a ocorrência de S. commersoniana onde, geralmente, se torna a espécie dominante. A fim de elucidar alguns aspectos de tolerância ao alagamento, plantas dessa espécie foram mantidas na capacidade de campo e em solo alagado por dois meses. Após esse período, algumas plantas foram desalagadas para verificar o comportamento da espécie no período de reaeração. O alagamento induziu, em raízes, aumento de espaços intercelulares, redução na espessura do cilindro central e aumento na espessura do córtex. Plantas alagadas cresceram menos que as controle e desenvolveram lenticelas hipertróficas caulinares e algumas raízes adventícias. Plantas reaeradas retomaram...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ecological anatomy; Hypoxia; Sebastiania commersoniana.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84041998000300010

Ecophysiology and respiratory metabolism during the germination of Inga sessilis (Vell.) Mart. (Mimosaceae) seeds subjected to hypoxia and anoxia
Provedor de dados: 88
Autores: OKAMOTO,JANETE MAYUMI; JOLY,CARLOS ALFREDO.
This paper presents a study on the respiratory metabolism of germinating seeds of Inga sessilis subjected to normoxia, hypoxia and anoxia. Although it is typical of environments where waterlogging seldom occurs, 40% of its seeds are able to germinate under hypoxia; yet, anoxia periods over 96 h are lethal to the seeds. Ethanol is the main product of the seeds anaerobic metabolism, but the steep increase in lactate after 24 h anoxia or 48 h hypoxia may explain the drop in seed viability.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Inga sessilis; Germination; Respiratory metabolism; Hypoxia; Anoxia.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042000000100006

Manganese accumulation and its relation to "eucalyptus shoot blight in the Vale do Rio Doce"
Provedor de dados: 90
Autores: Leite,Fernando Palha; Novais,Roberto Ferreira; Silva,Ivo Ribeiro; Barros,Nairam Félix; Neves,Júlio César Lima; Medeiros,Alex Giovanny B.; Ventrella,Marília Contin; Villani,Ecila Mercês de Albuquerque.
Eucalyptus Shoot Blight in the Vale do Rio Doce (ESBVRD) is an anomaly that leads to reduced growth and, in more extreme cases, to death of eucalyptus plants. Initially diagnosed in plantations in the region of the Vale do Rio Doce, in the State of Minas Gerais, Brazil, this problem has also been found in plantations in other regions of the country and even in other countries. Although the symptoms of this anomaly are well-known, its causes are not yet understood. The aim of this study was to evaluate the cause-effect relationship between accumulation of manganese (Mn) in eucalyptus clones and ESBVRD. Characterization of the environment in areas of greater occurrence of this problem in regard to soil, climate and fluctuation of the water table was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hypoxia; Groundwater; Redox potential.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000100019

Functionality of the plastron in adults of Neochetina eichhorniae Warner (Coleoptera, Curculionidae): aspects of the integument coating and submersion laboratory experiments
Provedor de dados: 92
Autores: Sousa,Wesley Oliveira de; Rosado-Neto,Germano Henrique; Marques,Marinêz Isaac.
The plastron theory was tested in adults of Neochetina eichhorniae Warner, 1970, through the analysis of the structure that coats these insects' integument and also through submersion laboratorial experiments. The tegument processes were recognized in three types: agglutinated scales with large perforations, plumose scales of varied sizes and shapes, and hairs. The experiments were carried out on 264 adult individuals which were kept submerged at different time intervals (n = 11) and in two types of treatment, natural non-aerated water and previously boiled water, with four repetitions for each treatment. The tests showed a maximum mortality after 24 hours of immersion in the previously boiled water treatment. The survival of the adults was negative and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hypoxia; Pantanal; Plastron; Stenopelmini; Weevil.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262012000300012

Anatomical and morphological modifications in response to flooding by six Cerrado tree species
Provedor de dados: 39
Autores: Oliveira,Adilson Serafim de; Ferreira,Cristiane Silva; Graciano-Ribeiro,Dalva; Franco,Augusto César.
Wetlands are common in the Cerrado (Brazilian savannas) biome, however flooding of these wetlands impairs growth and development of most plants. We evaluated flood tolerance of typical Cerrado trees. Seedlings of Aspidosperma macrocarpon (Apocynaceae), Tabebuia rosea (Bignoniaceae), Handroanthus chrysotrichus (Bignoniaceae), Myracrodruon urundeuva (Anacardiaceae), Kielmeyera coriacea (Calophyllaceae) and Copaifera langsdorffii (Fabaceae) were flooded up to the stem base for 30 days. Stems with cortical cracks, secondary aerenchyma and hypertrophic lenticels were observed in flooded plants of M. urundeuva,H. chrysotrichus and T. rosea while adventitious roots were formed in flooded plants of T. rosea and H. chrysotrichus. However, only T. rosea developed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aerenchyma; Biomass partitioning; Flood tolerance; Hypoxia; Water stress.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062015000400478

Expression of genes related to soil flooding tolerance in soybeans
Provedor de dados: 1
Autores: Casarotto, Gabriele; Kaspary, Tiago Edu; Cutti, Luan; Thomas, André Luis; Barbosa Neto, Jose Fernandes.
The flooded environment brings about injuries to soybeans that vary depending on the adaptation ability of the genotype. Oxygen deprivation promotes the induction of the expression of genes related to glycolysis and fermentation pathways to maintain energy metabolism and, in addition to reducing-power consuming processes, act in the formation of adaptive structures and the maintenance of the redox status of the plant. The aim of this work was to evaluate the relative expression of genes related to soil flooding response in two contrasting soybean cultivars. Soybean plants of the sensitive (BRS 154) and tolerant (I27) cultivars at the V1 development stage were submitted to the flooding and control conditions (without flooding) for 0, 24, 48, and 96 hours....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max (L.) Merr.; Hypoxia; Abiotic stress; Metabolic alterations; RT-qPCR.
Ano: 2019
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/42709

Effects of waterlogging stress on plant-pathogen interaction between Fusarium poae and wheat/ barley
Provedor de dados: 1
Autores: Martinez, Mauro; Arata, Agustín Francisco; Lázaro, Laura; Stenglein, Sebastian Alberto; Dinolfo, María Inés.
Waterlogging stress is one of the abiotic factors which causes damage to crops affecting yield components and grain quality of wheat and barley. On the other hand, Fusarium poae is one of the most common Fusarium species isolated from wheat and barley. The aim of this study was to evaluate the effects of waterlogging and F. poae on disease parameters, yield components and grain quality of durum and bread wheat and barley. The experiment was carried out using pots under greenhouse conditions. Four treatments were applied: control/control (W0F0), control/F. poae (W0F1), waterlogging/control (W1F0) and waterlogging/F. poae (W1F1). The results showed that incidence, severity and FHB index of F. poae were higher in W0F1 compared to W1F1 suggesting that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Disease parameters; Hordeins; Hypoxia; Glutenins; Grain quality; Severity.
Ano: 2019
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/42629

Growth effects of water excess on coffee seedlings (Coffea arabica L.)
Provedor de dados: 1
Autores: Silveira, Helbert Rezende de Oliveira; Universidade Federal de Lavras; Santos, Meline de Oliveira; Universidade Federal de Lavras; Alves, Jose Donizeti; Universidade Federal de Lavras; Souza, Kamila Rezende Dázio de; Universidade Federal de Lavras; Andrade, Cinthia Aparecida; Universidade Federal de Lavras; Alves, Raphaella Gomes Martins; Universidade Federal de Lavras.
The objective of the present study was to evaluate the interference of water excess in soil on the growth of young coffee plants of the Mundo Novo and Catuaí cultivars.Plants were subjected to the following three different substrate water availability conditions: control (well-watered), continuous substrate waterlogged, and intermittent substrate waterlogged. Several growth-related traits were evaluated over the course of 19 weeks. Based on the number and quality of the affected variables from all forms of analyses, the Catuaí cultivar showed greater sensitivity to waterlogging. Both cultivars exhibited growth inhibition in response to substrate waterlogging stress, which was exacerbated by premature leaf dropping. 
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 5.01.00.00-9; 5.01.03.00-8 soil waterlogging; Hypoxia; Mundo novo cultivar; Catuaí cultivar 5.01.03.06-7.
Ano: 2014
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/17557

Effects of waterlogging stress on plant-pathogen interaction between Fusarium poae and wheat/ barley
Provedor de dados: 1
Autores: Martinez, Mauro; Arata, Agustín Francisco; Lázaro, Laura; Stenglein, Sebastian Alberto; Dinolfo, María Inés.
Waterlogging stress is one of the abiotic factors which causes damage to crops affecting yield components and grain quality of wheat and barley. On the other hand, Fusarium poae is one of the most common Fusarium species isolated from wheat and barley. The aim of this study was to evaluate the effects of waterlogging and F. poae on disease parameters, yield components and grain quality of durum and bread wheat and barley. The experiment was carried out using pots under greenhouse conditions. Four treatments were applied: control/control (W0F0), control/F. poae (W0F1), waterlogging/control (W1F0) and waterlogging/F. poae (W1F1). The results showed that incidence, severity and FHB index of F. poae were higher in W0F1 compared to W1F1 suggesting that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Disease parameters; Hordeins; Hypoxia; Glutenins; Grain quality; Severity.
Ano: 2019
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/42629

Flooding avoidance Triplaris gardneriana Wedd. (Polygonaceae): growth and morpho-anatomical aspects
Provedor de dados: 3
Autores: Pontara, Vanessa; Bueno, Marcelo Leandro; Scremin-Dias, Edna.
The aim of this study was to analyze the effect of flooding in Triplaris gardneriana Wedd, cultivated in drained soil (control) and in flooded condition. The experiment was developed in a greenhouse, using plants with 90 days after the emergency. The response to treatment was evaluated at 0, 30, 60 and 90 days. Growth measurements were made, such as biomass allocation, relative growth rate (RGR). Adventitious roots were not measured only observed, as well as the development of hypertrophied lenticels. The RGR was continuously reduced along the 90 days in flooding conditions for the roots, stem and leaves, compared to control. The flooding of the substrate caused alterations such as: increasing of the cortex width and diameter of the central cylinder of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ciências Biológicas; Botânica Pantanal; Hypoxia; RGR; Flooding Botânica.
Ano: 2016
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/31267

Fishes of the Amazon: diversity and beyond
Provedor de dados: 42
Autores: VAL,ADALBERTO LUIS.
Abstract: The Amazon basin houses a particular group of freshwater organisms, whose study tells the geological history of the region, how biological diversity was shaped, how it is maintained, and what it hides. The fish of the Amazon is represented by more than 3,000 known species distributed from the basal groups up to the more specialized ones. This species richness hides a diversity of adaptations that are dispersed at all levels of the biological organization. In this summary of the conference delivered at the Brazil-France Bilateral Symposium, held in Manaus in 2018, we describe two aspects of the hidden world of adaptive diversity: adaptations to changes in dissolved oxygen and the abilities of the Rio Negro fish to face acidic and ion-poor waters...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazonia; Biodiversity; Adaptations; Hypoxia; Dissolved organic carbon; Climate changes.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000600602

Cobalt chloride stimulates phosphoinositide 3-kinase/Akt signaling through the epidermal growth factor receptor in oral squamous cell carcinoma
Provedor de dados: 47
Autores: Heon Ryu,Mi; Hee Park,Jeong; Eun Park,Ji; Chung,Jin; Hun Lee,Chang; Ryoun Park,Hae.
Tumor cells are often found under hypoxic conditions due to the rapid outgrowth of their vascular supply, and, in order to survive hypoxia, these cells induce numerous signaling factors. Akt is an important kinase in cell survival, and its activity is regulated by the upstream phosphoinositide 3-kinase (PI3K) and receptor tyrosine kinases (RTKs). In this study, we examined Akt activation and RTKs/PI3K/Akt signaling using the hypoxia-mimetic cobalt chloride in oral squamous carcinoma cells. Cobalt chloride increases Akt phosphorylation in both a dose- and time-dependent manner. Blocking the activation of the PI3K/Akt pathway using LY294002 abolished Akt activation in response to cobalt chloride, suggesting that Akt phosphorylation by cobalt chloride is...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hypoxia; DNA synthesis; S-phase.
Ano: 2010
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452010000100003

Agmatine inhibits hypoxia-induced TNF-alpha release from cultured retinal ganglion cells
Provedor de dados: 47
Autores: Hong,Samin; Park,Kyoungsoo; Kim,Chan Yun; Seong,Gong Je.
The effect of hypoxia on the release of tumor necrosis factor-alpha (TNF-alpha) in transformed rat retinal ganglion cells (RGCs) and the effect of agmatine on the hypoxia-induced production of TNF-alpha in RGCs were evaluated. RGCs were cultured under hypoxic conditions with 5% oxygen, with or without 100&amp;#956;M agmatine. The expression levels of TNF-alpha and its receptor-1 (TNF-R1) were investigated by Western blot analysis. After 6 hours of hypoxia, we noted an increase in TNF-alpha production in RGCs. Agmatine significantly reduced TNF-alpha level after 12 hours of hypoxic treatment. The expression of TNF-R1 was not affected by the hypoxia or agmatine treatment. Our results show that agmatine inhibits the TNF-alpha production of RGCs in hypoxic...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Retinal ganglion cell; Tumor necrosis factor-alpha; Hypoxia; Agmatine.
Ano: 2008
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452008000200006

Nitric oxide and carotid body chemoreception
Provedor de dados: 48
Autores: ITURRIAGA,RODRIGO.
Nitric oxide (NO) has been proposed as an inhibitory modulator of carotid body chemosensory responses to hypoxia. It is believed that NO modulates carotid chemoreception by several mechanisms, which include the control of carotid body vascular tone and oxygen delivery and reduction of the excitability of chemoreceptor cells and petrosal sensory neurons. In addition to the well-known inhibitory effect, we found that NO has a dual (dose-dependent) effect on carotid chemoreception depending on the oxygen pressure level. During hypoxia, NO is primarily an inhibitory modulator of carotid chemoreception, while in normoxia NO increased the chemosensory activity. This excitatory effect produced by NO is likely mediated by an impairment of mitochondrial electron...
Tipo: Journal article
Palavras-chave: Carotid body; Chemoreceptor; Cytochrome oxidase; Hypoxia; Nitric oxide; Oxidative phosphorylation.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602001000200019

Carbonic anhydrase activity in the red blood cells of sea level and high altitude natives
Provedor de dados: 48
Autores: GAMBOA,JORGE; CACEDA,RICARDO; GAMBOA,ALFREDO; MONGE-C,CARLOS.
Red blood cell carbonic anhydrase (CA) activity has not been studied in high altitude natives. Because CA is an intraerythocytic enzyme and high altitude natives are polycythemic, it is important to know if the activity of CA per red cell volume is different from that of their sea level counterparts. Blood was collected from healthy subjects living in Lima (150m) and from twelve subjects from Cerro de Pasco (4330m), and hematocrit and carbonic anhydrase activity were measured. As expected, the high altitude natives had significantly higher hematocrits than the sea level controls (p=0.0002). No difference in the CA activity per milliliter of red cells was found between the two populations. There was no correlation between the hematocrit and CA activity.
Tipo: Journal article
Palavras-chave: Carbonic anhydrase; Hypoxia; Polycythemia.
Ano: 2000
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602000000300006

Seed germination performances of Styrax species help understand their distribution in Cerrado areas in Brazil
Provedor de dados: 53
Autores: Kissmann,Camila; Habermann,Gustavo.
In this descriptive paper, we described germination responses of Styrax pohlii, S. camporum and S. ferrugineus seeds at 5, 10, 15, 20, 25, 30, 35, 40 and 45 °C. We also assessed the percentage germination (%G) of S. pohlii seeds with different seed water contents because, as a forest species, it seems to have recalcitrant seed behavior. Intrigued by the capacity of seeds of this species to germinate directly from puddles formed on poorly drained soils of riparian forests, where it typically occurs, we also tested the effect of de-pulping fruits on germination of S. pohlii seeds under hypoxia and normoxia conditions. In addition, we checked whether distinct concentrations of gibberellic acid (GA3) could break S. ferrugineus seed dormancy, a typical seed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hypoxia; Styrax pohlii; S. camporum; S. ferrugineus; Temperature; Desiccation seed tolerance.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052013000300001

Regulating Effect Of Carnosine And /Or L- Arginine On The Expression Of Inflammatory Molecules Induced Nephropathy In The Hypoxic Rat Model
Provedor de dados: 52
Autores: Al-Rasheed,Nouf M.; Fadda,Laila; Mohamed,Azza M; Attia,Hala A.; Al-Rasheed,Nawal M.
This study aimed to explore the effective role of carnosine and /or L- arginine in down regulation of the inflammatory molecule expression caused renal damage in response to sodium nitrite (NaNO2) induced hypoxia in rats . NaNO2 was administered subcutaneously (s.c.) to rats as a single dose (60 mg/kg body weight ). L-arginine (200mg/Kg body weight) and carnosine (250 mg/ Kg body weight ) were administered (i.p.) as a single dose , 24 h before NaNO2 injection. The results revealed that pre- administration of arginine and /or carnosine to NaNO2 hypoxic rats, significantly modulated the increases in serum markers of renal function (creatinine and urea) as well as the decrease in hemoglobin (Hb) level versus hypoxic rats. The two agents each alone or in a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hypoxia; Arginine; Carnosine; Inflammatory molecules; Renal damage.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132016000100310

Influence of the 15-HETE on cytosolic [ Ca2+] i of the rabbit pulmonary artery smooth muscle cells
Provedor de dados: 52
Autores: Tang,Xiaobo; Zhang,Rong; Wang,Zhigang; Yu,Lei; Li,Shanshan; Zhu,Daling.
Extracellular Ca2+ influx was blocked by L-type Ca2+ channel blocker nifedipine to observe the effects of 15-hydroxyeicosatetraenoic acid on the constriction of rabbit pulmonary artery rings and on the changes of Ca2+ level in the rabbit pulmonary artery smooth muscle cells, and further to investigate the mechanism of the calcium mobilization induced by the 15-HETE under hypoxic conditions. The effect of extracellular Ca2+ on tension of the rabbit PA rings was also studied. Nifedipine (10 µ mol/L) had no effect on 1 µ mol/L 15-hydroxyeicosatetraenoic acid induced vasoconstriction under normoxic and hypoxic conditions. Intracellular Ca2+ increased markedly in the 15-HETE group (cells were exposed to 1 µ mol/L 15-HETE for 8 min during culture) compared to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 15-hydroxyeicosatetraenoic acid; Hypoxia; Pulmonary artery rings; Pulmonary artery smooth muscle cells; [ Ca2+]i.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000200007

Effects of aerial exposure on antioxidant defenses in the brown mussel Perna perna
Provedor de dados: 52
Autores: Almeida,Eduardo Alves de; Bainy,Afonso Celso Dias.
Investigations were carried out to evaluate the antioxidant defenses in digestive gland of mussels Perna perna held in air for 4 hours, exposed to air for 4 hours followed by submersion in water for 30 minutes, and constantly submerged for 4.5 hours. No differences were observed in CAT and GPx activities and in the levels of total GSH. Mussels exposed to air had significantly higher SOD activity, possibly related to a preparative mechanism of defense against oxidative stress during reoxygenation.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidant; Hypoxia; Mussel; Perna perna; Aerial exposure.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000300007

Ventilatory flow relative to intrabuccal and intraopercular volumes in the serrasalmid fish Piaractus mesopotamicus during normoxia and exposed to graded hypoxia
Provedor de dados: 57
Autores: KALININ,A. L.; SEVERI,W.; GUERRA,C. D. R.; COSTA,M. J.; RANTIN,F. T.
Ventilation volume (&lt;img src="http:/img/fbpe/rbbio/v60n2/a08vg.gif" alt="a08vg.gif (265 bytes)" align="absmiddle"&gt; – mlH2O.min–1 ), respiratory frequency (fR – breaths.min–1) and tidal volume (V T – mlH2O.breath–1 ) were measured in a group of Piaractus mesopotamicus (650.4 ± 204.7 g; n = 10) during normoxia and in response to graded hypoxia. The fR was maintained constant, around 100 breaths.min–1, from normoxia until the O2 tension of the inspired water (PiO2) of 53 mmHg, below which it increased progressively, reaching maximum values (157.6 ± 6.3 breaths.min–1) at 10 mmHg. The V T rose from 1.8 ± 0.1 to 6.0 ± 0.5 and 5.7 ± 0.4 mlH2O. breath–1 in the PiO2 of 16 and 10 mmHg, respectively. The &lt;img src="http:/img/fbpe/rbbio/v60n2/a08vg.gif"...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hypoxia; Normoxia; Ventilatory parameters; Buccal and opercular volumes; Piaractus mesopotamicus.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000200008

Changes in lactate dehydrogenase and malate dehydrogenase activities during hypoxia and after temperature acclimation in the armored fish, Rhinelepis strigosa (Siluriformes, Loricariidae)
Provedor de dados: 57
Autores: PANEPUCCI,L.; FERNANDES,M. N.; SANCHES,J. R.; RANTIN,F. T.
Lactate (LDH) and malate dehydrogenase (MDH) of white skeletal muscle of fishes acclimated to 20, 25 and 30°C and thereafter submitted to hypoxia were studied in different substrate concentrations. Significant differences for LDH and MDH of white muscle enzyme activities are described here for the first time in Rhinelepis strigosa of fishes acclimated to 20°C and submitted to hypoxia for six hours. LDH presented a significant decrease in enzyme affinity for pyruvate in acute hypoxia, for fishes acclimated to 20°C and an increase for fishes acclimated to 30°C.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hypoxia; Acclimation temperature; Lactate dehydrogenase; Malate dehydrogenase; Armored fish; Rhinelepis strigosa.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000200021

Cardioprotection against experimental myocardial ischemic injury using cornin
Provedor de dados: 56
Autores: Xu,Y.; Xu,Y.; Luan,H.; Jiang,Y.; Tian,X.; Zhang,S.
Phosphorylated-cyclic adenosine monophosphate response element-binding protein (Phospho-CREB) has an important role in the pathogenesis of myocardial ischemia. We isolated the iridoid glycoside cornin from the fruit of Verbena officinalis L, investigated its effects against myocardial ischemia and reperfusion (I/R) injury in vivo, and elucidated its potential mechanism in vitro. Effects of cornin on cell viability, as well as expression of phospho-CREB and phospho-Akt in hypoxic H9c2 cells in vitro, and myocardial I/R injury in vivo, were investigated. Cornin attenuated hypoxia-induced cytotoxicity significantly in H9c2 cells in a concentration-dependent manner. Treatment of H9c2 cells with cornin (10 µM) blocked the reduction of expression of phospho-CREB...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cornin; Myocardial ischemia and reperfusion; CREB; Akt; Hypoxia.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2016000200608

The blockade of cyclooxygenases-1 and -2 reduces the effects of hypoxia on endothelial cells
Provedor de dados: 56
Autores: Gloria,M.A.; Cenedeze,M.A.; Pacheco-Silva,A.; Câmara,N.O.S.
Hypoxia activates endothelial cells by the action of reactive oxygen species generated in part by cyclooxygenases (COX) production enhancing leukocyte transmigration. We investigated the effect of specific COX inhibition on the function of endothelial cells exposed to hypoxia. Mouse immortalized endothelial cells were subjected to 30 min of oxygen deprivation by gas exchange. Acridine orange/ethidium bromide dyes and lactate dehydrogenase activity were used to monitor cell viability. The mRNA of COX-1 and -2 was amplified and semi-quantified before and after hypoxia in cells treated or not with indomethacin, a non-selective COX inhibitor. Expression of RANTES (regulated upon activation, normal T cell expressed and secreted) protein and the protective role...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Endothelial cell; Hypoxia; Indomethacin; Cyclooxygenase; Heme oxygenase 1.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2006000900006

Effect of hypoxia on the activity and binding of glycolytic and associated enzymes in sea scorpion tissues
Provedor de dados: 56
Autores: Lushchak,V.I.; Bahnjukova,T.V.; Storey,K.B.
The effect of hypoxia on the levels of glycogen, glucose and lactate as well as the activities and binding of glycolytic and associated enzymes to subcellular structures was studied in brain, liver and white muscle of the teleost fish, Scorpaena porcus. Hypoxia exposure decreased glucose levels in liver from 2.53 to 1.70 µmol/g wet weight and in muscle led to its increase from 3.64 to 25.1 µmol/g wet weight. Maximal activities of several enzymes in brain were increased by hypoxia: hexokinase by 23%, phosphoglucoisomerase by 47% and phosphofructokinase (PFK) by 56%. However, activities of other enzymes in brain as well as enzymes in liver and white muscle were largely unchanged or decreased during experimental hypoxia. Glycolytic enzymes in all three...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fish; Sea scorpion; Scorpaena porcus; Hypoxia; Metabolites; Glycolytic enzyme binding.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1998000800005

Gene expression promoted by the SV40 DNA targeting sequence and the hypoxia-responsive element under normoxia and hypoxia
Provedor de dados: 56
Autores: Sacramento,C.B.; Moraes,J.Z.; Denapolis,P.M.A.; Han,S.W.
The main objective of the present study was to find suitable DNA-targeting sequences (DTS) for the construction of plasmid vectors to be used to treat ischemic diseases. The well-known Simian virus 40 nuclear DTS (SV40-DTS) and hypoxia-responsive element (HRE) sequences were used to construct plasmid vectors to express the human vascular endothelial growth factor gene (hVEGF). The rate of plasmid nuclear transport and consequent gene expression under normoxia (20% O2) and hypoxia (less than 5% O2) were determined. Plasmids containing the SV40-DTS or HRE sequences were constructed and used to transfect the A293T cell line (a human embryonic kidney cell line) in vitro and mouse skeletal muscle cells in vivo. Plasmid transport to the nucleus was monitored by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: SV40-DTS; Hypoxia-responsive element; Transfection efficiency; Normoxia; Hypoxia; Ischemic diseases.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2010000800005

Cardiovascular, respiratory and metabolic responses to temperature and hypoxia of the winter frog Rana catesbeiana
Provedor de dados: 56
The objective of the present study was to determine the effects of hypoxia and temperature on the cardiovascular and respiratory systems and plasma glucose levels of the winter bullfrog Rana catesbeiana. Body temperature was maintained at 10, 15, 25 and 35oC for measurements of breathing frequency, heart rate, arterial blood pressure, metabolic rate, plasma glucose levels, blood gases and acid-base status. Reducing body temperature from 35 to 10oC decreased (P&amp;lt;0.001) heart rate (bpm) from 64.0 ± 3.1 (N = 5) to 12.5 ± 2.5 (N = 6) and blood pressure (mmHg) (P&amp;lt;0.05) from 41.9 ± 2.1 (N = 5) to 33.1 ± 2.1 (N = 6), whereas no significant changes were observed under hypoxia. Hypoxia-induced changes in breathing frequency and acid-base status were...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Temperature; Hypoxia; Rana; Breathing frequency; Blood pressure; Heart rate; Acid-base status; Hyperglycemia.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1997000100019

Chemoreceptors and cardiovascular control in acute and chronic systemic hypoxia
Provedor de dados: 56
Autores: Marshall,J.M.
This review describes the ways in which the primary bradycardia and peripheral vasoconstriction evoked by selective stimulation of peripheral chemoreceptors can be modified by the secondary effects of a chemoreceptor-induced increase in ventilation. The evidence that strong stimulation of peripheral chemoreceptors can evoke the behavioural and cardiovascular components of the alerting or defence response which is characteristically evoked by novel or noxious stimuli is considered. The functional significance of all these influences in systemic hypoxia is then discussed with emphasis on the fact that these reflex changes can be overcome by the local effects of hypoxia: central neural hypoxia depresses ventilation, hypoxia acting on the heart causes...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hypoxia; Adenosine; Chemoreceptors; Vasodilatation; Noradrenaline.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1998000700002

Angiotensin II type 1 receptor blockade partially attenuates hypoxia-induced pulmonary hypertension in newborn piglets: relationship with the nitrergic system
Provedor de dados: 56
Autores: Camelo Jr.,J.S.; Martins,A.R.; Rosa,E.; Ramos,S.G.; Hehre,D.; Bancalari,E.; Suguihara,C.
The objective of this study was to observe possible interactions between the renin-angiotensin and nitrergic systems in chronic hypoxia-induced pulmonary hypertension in newborn piglets. Thirteen chronically instrumented newborn piglets (6.3 ± 0.9 days; 2369 ± 491 g) were randomly assigned to receive saline (placebo, P) or the AT1 receptor (AT1-R) blocker L-158,809 (L) during 6 days of hypoxia (FiO2 = 0.12). During hypoxia, pulmonary arterial pressure (Ppa; P &lt; 0.0001), pulmonary vascular resistance (PVR; P &lt; 0.02) and the pulmonary to systemic vascular resistance ratio (PVR/SVR; P &lt; 0.05) were significantly attenuated in the L (N = 7) group compared to the P group (N = 6). Western blot analysis of lung proteins showed a significant decrease of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Newborn animals; Pulmonary hypertension; Angiotensin II; Angiotensin receptors; Hypoxia.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2012000200012

Morphological changes of carotid bodies in acute respiratory distress syndrome: a morphometric study in humans
Provedor de dados: 56
Autores: Vinhaes,E.N.G.; Dolhnikoff,M.; Saldiva,P.H.N.
Carotid bodies are chemoreceptors sensitive to a fall of partial oxygen pressure in blood (hypoxia). The morphological alterations of these organs in patients with chronic obstructive pulmonary disease (COPD) and in people living at high altitude are well known. However, it is not known whether the histological profile of human carotid bodies is changed in acute clinical conditions such as acute respiratory distress syndrome (ARDS). The objective of the present study was to perform a quantitative analysis of the histology of carotid bodies collected from patients who died of ARDS. A morphometric study of carotid bodies collected during routine autopsies was carried out on three groups: patients that died of non-respiratory diseases (controls, N = 8),...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carotid body; Hypoxia; Acute respiratory distress syndrome; Morphometry.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2002001000002

Hypoxia-induced hyperpermeability of rat glomerular endothelial cells involves HIF-2α mediated changes in the expression of occludin and ZO-1
Provedor de dados: 56
Autores: Luo,Peng-Li; Wang,Yan-Jun; Yang,Yan-Yan; Yang,Jia-Jia.
This study aimed to investigate the role of hypoxia-inducible factor-2α (HIF-2α) in the expression of tight junction proteins and permeability alterations in rat glomerular endothelial cells (rGENCs) under hypoxia conditions. The expression level of HIF-2α and tight junction proteins (occludin and ZO-1) in rGENCs were examined following 5% oxygen density exposure at different treatment times. HIF-2α lentivirus transfection was used to knockdown HIF-2α expression. Cells were divided into four groups: 1) control group (rGENCs were cultured under normal oxygen conditions), 2) hypoxia group (rGENCs were cultured under hypoxic conditions), 3) negative control group (rGENCs were infected with HIF-2α lentivirus negative control vectors and cultured under hypoxic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hypoxia; HIF-2α; Rat glomerular endothelial cells; Tight junction; Permeability.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2018000700604

Role of nitric oxide in hypoxia-induced hyperventilation and hypothermia: participation of the locus coeruleus
Provedor de dados: 56
Autores: Fabris,G.; Anselmo-Franci,J.A.; Branco,L.G.S.
Hypoxia elicits hyperventilation and hypothermia, but the mechanisms involved are not well understood. The nitric oxide (NO) pathway is involved in hypoxia-induced hypothermia and hyperventilation, and works as a neuromodulator in the central nervous system, including the locus coeruleus (LC), which is a noradrenergic nucleus in the pons. The LC plays a role in a number of stress-induced responses, but its participation in the control of breathing and thermoregulation is unclear. Thus, in the present study, we tested the hypothesis that LC plays a role in the hypoxia-induced hypothermia and hyperventilation, and that NO is involved in these responses. Electrolytic lesions were performed bilaterally within the LC in awake unrestrained adult male Wistar rats...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitric oxide; Locus coeruleus; Hypoxia; Ventilation; Body temperature; Rat.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1999001100009

HSF-1, HIF-1and HSP90 expression on recombinant Pichia pastoris under fed-batch fermentation
Provedor de dados: 58
Autores: Zepeda,Andrea B.; Figueroa,Carolina A.; Abdalla,Dulcineia S.P.; Maranhão,Andrea Q.; Ulloa,Patricio H.; Pessoa Jr.,Adalberto; Farías,Jorge G.
Pichia pastoris is a methylotrophic yeast used as an efficient expression system for heterologous protein production as compared to other expression systems. Considering that every cell must respond to environmental changes to survive and differentiate, determination of endogenous protein related to heat stress responses and hypoxia, it would necessary to establish the temperature and methanol concentration conditions for optimal growth. The aim of this study is characterize the culture conditions through the putative biomarkers in different conditions of temperature and methanol concentration. Three yeast cultures were performed: 3X = 3% methanol -10 °C, 4X = 3% methanol -30 °C, and 5X = 1% methanol -10 °C. The expression level of HIF-1α, HSF-1, HSP-70...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Recombinant yeast; Heat stress protein; Hypoxia; Chaperone.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822014000200015

Nitrate uptake and metabolism by roots of soybean plants under oxygen deficiency.
Provedor de dados: 61
Autores: Brandão,Andrea D.; Sodek,Ladaslav.
Nitrate is reported to improve tolerance of plants towards oxygen deficiency enabled by waterlogging of the root system, but the mechanism underlying the phenomenon remains poorly understood. We studied the metabolism of nitrate in roots exposed to hypoxia, using soybean plants growing in a hydroponic system after suspending aeration and covering the surface of the nutrient solution with mineral oil. Nitrate depletion from the medium was more intense under hypoxia than normoxia, but in the presence of chloramphenicol, consumption under hypoxia was significantly reduced. Nitrite accumulated in the medium in the state of hypoxia and this effect was partially eliminated by chloramphenicol. Nitrate consumption sensitive to chloramphenicol was attributed to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Hypoxia; Nitrate reductase; Nitrite; Waterlogging.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202009000100003

Amino acid and ureide transport in the xylem of symbiotic soybean plants during short-term flooding of the root system in the presence of different sources of nitrogen
Provedor de dados: 61
Autores: Thomas,André Luís; Sodek,Ladaslav.
The transport of organic N compounds to the shoot in the xylem sap of nodulated soybean plants was investigated in an attempt to better understand the changes in N metabolism under root hypoxia (first 5 days of flooding), with different sources of N in the medium. NO3- is beneficial for tolerance of plants to waterlogging, whereas other N sources such as NH4+ and NH4NO3, are not. Nevertheless, in the presence of NH4+ high levels of amino acids were transported in the xylem, consistent with its assimilation. Some increase in the transport of amino acids was also seen with NO3- nutrition during waterlogging, but not with N-free medium. Ureide transport in the xylem was severely reduced during waterlogging, consistent with impaired N2 fixation under these...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Alanine; Hypoxia; N metabolism.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202006000200010

The metabolic response of plants to oxygen deficiency
Provedor de dados: 61
Autores: Sousa,Carlos Antônio Ferreira de; Sodek,Ladaslav.
Plants, under natural or experimental conditions, can be subject to a range of O2 concentrations from normal (normoxia) through deficient (hypoxia) to total absence (anoxia). Many metabolic processes are affected by O2 deficiency but the most studied events are those related to respiration and metabolism of N. In the absence of a terminal electron acceptor for the electron transport chain, the tricarboxylic acid cycle functions only partially and in both directions. Acidification of the cytosol occurs and pyruvate, the product of glycolysis, is transformed to lactate and ethanol, which represent the main fermentation reactions in plants. Alanine is the third most important product of anaerobic metabolism, resulting from high rates of amino acid...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anoxia; Hypoxia; N metabolism; Fermentation products.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202002000200002

Isoflavone and protein content in soybeans grains submitted to flooding at different stages of development
Provedor de dados: 65
Autores: Fante,Camila Argenta; Goulart,Patrícia de Fátima Pereira; Alves,José Donizeti; Henrique,Paôla de Castro; Fries,Daniela Deitos.
The stress imposed on plants by soil flooding constitutes a major barrier to growth and productivity. The identification of soybean varieties that produce higher levels of isoflavones, is necessary as soybeans have been used as human food to reduce risks of chronic diseases. Thus, this study was conducted with the objective of quantifying proteins and isoflavones in soybean cultivars subjected to flooding at various stages of development. The cultivars 'BRS267', 'BRS257' and 'BRS213' were subjected to 15 days of flooding, starting at the stages V6 and V8 and 11 days under stress starting at the stage R4. The proteins in the grain were extracted and quantified and analyzed by SDS-PAGE electrophoresis. Isoflavones were extracted, separated and quantified on...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Hypoxia; Functional food.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782011001200029

Dissolved oxygen and ammonia levels in water that affect plasma ionic content and gallbladder bile in silver catfish
Provedor de dados: 65
Autores: Becker,Alexssandro Geferson; Garcia,Luciano de Oliveira; Kochhann,Daiani; Gonçalves,Jamile Fabbrin; Loro,Vania Lúcia; Baldisserotto,Bernardo.
Ionic contents (Na+, K+ and Cl-) of plasma and gallbladder bile (GB) of juveniles silver catfish, Rhamdia quelen (156.1±0.2g, 28.2±0.3cm), were determined in three different times (0, 6 and 24h) after exposure to: a) control or high dissolved oxygen (DO = 6.5mg L-1) + low NH3 (0.03mg L-1); b) low DO (3.5mg L-1) + low NH3; c) high DO + high NH3 (0.1mg L-1); and d) low DO + high NH3. High waterborne NH3 or low DO levels increased plasma and GB ion levels. These parameters might have followed different mechanisms to affect osmoregulation since a synergic effect of these variables was detected.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitrogen compound; Hypoxia; Ion levels; Jundiá; Osmoregulation.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782009000600020

Tolerance of apple rootstocks to short-term waterlogging
Provedor de dados: 65
Autores: Marchioretto,Lucas De Ross; Rossi,Andrea De; Amaral,Leonardo Oliboni do; Ribeiro,Ana Maria Alves de Souza.
ABSTRACT:  Until few years ago there were limited options of apple rootstocks commercially available for Brazilian growers; although, new series of Geneva® rootstocks introduced recently present desirable features such as vigor control and wider lateral branch angle. On the main apple producing regions of Brazil, intermittent rainfall eventually occurs and waterlogged condition is frequent especially in high clay oxisols; in addition, little is known about the tolerance of rootstocks M.9, Marubakaido/M.9 interstock, G.202, G.213 and G.814 to waterlogging. Thus, the objective of this experiment was to evaluate the tolerance of these rootstocks to short-term waterlogging on root and aerial parameters. Potted ‘Maxi Gala’ apple plants were kept under 48 hours...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Flood; Hypoxia; Resilience; Root system.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018000900201

Waterlogging effects upon the phenological phases of common bean cultivar BRSMG-Uai
Provedor de dados: 64
Autores: Costa,Beatriz Gonçalves Pereira; Amâncio,Bárbara Christina Silva; Boas,Lissa Vasconcellos Vilas; Bastos,Ludmila da Silva; Domiciano,Debora; Marchiori,Paulo Eduardo Ribeiro.
ABSTRACT Common bean (Phaseolus vulgaris L.) is an important source of protein and carbohydrates, besides being rich in several mineral nutrients. In a flooding situation, the low availability of oxygen may result in hypoxia or anoxia condition. Therefore, this study aimed to evaluate the responses of the common bean cultivar BRSMG-Uai subjected to hypoxia in different phenological phases, analyzing its responses in terms of growth, productivity, carbon and nitrogen metabolism. Thus, seeds of common beans were germinated and when the seedling reached growth stage V1, they were transferred to plastic boxes containing 40L of nutritive solution with steady aeration. Distinct series of plants were exposed to air-restriction on their roots for nine days, in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hypoxia; Phaseolus vulgaris L.; Nitrogen metabolism.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542020000100231