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https://www.readbyqxmd.com/read/28813504/effect-of-co2-induced-seawater-acidification-on-growth-photosynthesis-and-inorganic-carbon-acquisition-of-the-harmful-bloom-forming-marine-microalga-karenia-mikimotoi
#1
Shunxin Hu, Bin Zhou, You Wang, Ying Wang, Xinxin Zhang, Yan Zhao, Xinyu Zhao, Xuexi Tang
Karenia mikimotoi is a widespread, toxic and non-calcifying dinoflagellate, which can release and produce ichthyotoxins and hemolytic toxins affecting the food web within the area of its bloom. Shifts in the physiological characteristics of K. mikimotoi due to CO2-induced seawater acidification could alter the occurrence, severity and impacts of harmful algal blooms (HABs). Here, we investigated the effects of elevated pCO2 on the physiology of K. mikimotoi. Using semi-continuous cultures under controlled laboratory conditions, growth, photosynthesis and inorganic carbon acquisition were determined over 4-6 week incubations at ambient (390ppmv) and elevated pCO2 levels (1000 ppmv and 2000 ppmv)...
2017: PloS One
https://www.readbyqxmd.com/read/28812677/species-specific-responses-to-ocean-acidification-should-account-for-local-adaptation-and-adaptive-plasticity
#2
Cristian A Vargas, Nelson A Lagos, Marco A Lardies, Cristian Duarte, Patricio H Manríquez, Victor M Aguilera, Bernardo Broitman, Steve Widdicombe, Sam Dupont
Global stressors, such as ocean acidification, constitute a rapidly emerging and significant problem for marine organisms, ecosystem functioning and services. The coastal ecosystems of the Humboldt Current System (HCS) off Chile harbour a broad physical-chemical latitudinal and temporal gradient with considerable patchiness in local oceanographic conditions. This heterogeneity may, in turn, modulate the specific tolerances of organisms to climate stress in species with populations distributed along this environmental gradient...
March 13, 2017: Nature ecology & evolution
https://www.readbyqxmd.com/read/28812394/the-use-of-sustained-low-efficiency-dialysis-sled-in-massive-paracetamol-overdose
#3
Anselm Wong, Roger L K Tong, Liam Ryan, Tim Crozier, Andis Graudins
CONTEXT: Massive paracetamol ingestion causing mitochondrial dysfunction is uncommon. Use of sustained low-efficiency dialysis (SLED) to improve acidaemia and enhance paracetamol elimination has not been previously described. CASE DETAILS: A 44-year-old male presented to the emergency department 2.5 hours post overdose of 200 g (2.5 g/kg) of paracetamol. Examination revealed a BP 85/60 mmHg, pulse 112 bpm, temperature 33.9 °C and blood glucose of 13...
August 16, 2017: Clinical Toxicology
https://www.readbyqxmd.com/read/28811237/the-in-validity-of-volatile-poct-parameters-from-patients-beyond-normothermia
#4
Michael A Gruber, Stefan Felbermeir, Regina Lindner, Martin Kieninger
BACKGROUND: A common characteristic of all blood gas analyzers on the market is that measurements are processed at 37°C, not at the real patients´ temperature. Subsequently temperature-sensitive parameters can be mathematically corrected (alpha-stat method) or used directly (pH-stat method). National rules in Germany (Rili-BAEK) demand defined accuracy and precision without any restriction to samples´ temperatures or corrections. As consequence in the investigation at hand we tried to find out whether blood gas analyzers can fulfill the regulations for pCO2 and pO2 when normothermia of the matrix is not given...
August 12, 2017: Clinica Chimica Acta; International Journal of Clinical Chemistry
https://www.readbyqxmd.com/read/28795334/mathematical-modeling-of-extracorporeal-co2-removal-therapy-a-validation-carried-out-on-ten-pigs
#5
Simon Habran, Thomas Desaive, Philippe Morimont, Bernard Lambermont, Pierre Dauby
The extracorporeal CO2 removal device (ECCO2RD) is used in clinics to treat patients suffering from respiratory failures like acute respiratory distress syndrome (ARDS) or chronic obstructive pulmonary disease (COPD). The aim of this device is to decarboxylate blood externally with low blood flow. A mathematical model is proposed to describe protective ventilation, ARDS, and an extracorporeal CO2 removal therapy (ECCO2RT). The simulations are compared with experimental data carried out on ten pigs. The results show a good agreement between the mathematical simulations and the experimental data, which provides a nice validation of the model...
August 9, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28794479/the-organizing-effects-of-elevated-co2-on-competition-among-estuarine-primary-producers
#6
Craig S Young, Christopher J Gobler
Fossil fuel combustion, eutrophication, and upwelling introduce excess CO2 into coastal zones. The extent to which marine autotrophs may benefit from elevated CO2 will be a function of their carbon limitation and, among other factors, competition with other primary producers. Here, we report on experiments performed with North Atlantic species of Ulva and Gracilaria grown in situ or exposed to ambient (~400 µatm) and elevated pCO2 (~2500 µatm) and/or subjected to competition with each other and/or with natural plankton assemblages...
August 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28791154/co2-induced-ocean-acidification-does-not-affect-individual-or-group-behaviour-in-a-temperate-damselfish
#7
Garfield Tsz Kwan, Trevor James Hamilton, Martin Tresguerres
Open ocean surface CO2 levels are projected to reach approximately 800 µatm, and ocean pH to decrease by approximately 0.3 units by the year 2100 due to anthropogenic CO2 emissions and the subsequent process of ocean acidification (OA). When exposed to these CO2/pH values, several fish species display abnormal behaviour in laboratory tests, an effect proposed to be linked to altered neuronal GABAA- receptor function. Juvenile blacksmith (Chromis punctipinnis) are social fish that regularly experience CO2/pH fluctuations through kelp forest diurnal primary production and upwelling events, so we hypothesized that they might be resilient to OA...
July 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/28781187/effects-of-aerobic-respiration-and-nitrification-on-dissolved-inorganic-nitrogen-and-carbon-dioxide-in-human-perturbed-eastern-jiaozhou-bay-china
#8
Ping Han, Yunxiao Li, Xufeng Yang, Liang Xue, Longjun Zhang
Aerobic respiration and nitrification are important processes for dissolved inorganic nitrogen (DIN) composition change and CO2 production in human-perturbed coastal waters. On-site incubations and field investigations were conducted in the eastern Jiaozhou Bay, a high-urbanization region, from May to August 2014. Results show that aerobic respiration rates reached 15.58μmolO2L(-1)d(-1), and NH4(+) and NO2(-) oxidation rates were 0.53 and 0.13μmolNL(-1)d(-1), respectively, in the human-perturbed northeastern area...
August 3, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28780371/modelling-of-the-dissolution-and-reprecipitation-of-uranium-under-oxidising-conditions-in-the-zone-of-shallow-groundwater-circulation
#9
Ekaterina M Dutova, Aleksei N Nikitenkov, Vitaly D Pokrovskiy, David Banks, Bjørn S Frengstad, Valerii P Parnachev
Generic hydrochemical modelling of a grantoid-groundwater system, using the Russian software "HydroGeo", has been carried out with an emphasis on simulating the accumulation of uranium in the aqueous phase. The baseline model run simulates shallow granitoid aquifers (U content 5 ppm) under conditions broadly representative of southern Norway and southwestern Siberia: i.e. temperature 10 °C, equilibrated with a soil gas partial CO2 pressure (PCO2, open system) of 10(-2.5) atm. and a mildly oxidising redox environment (Eh = +50 mV)...
August 3, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28777195/prevalence-and-prognostic-association-of-circulating-troponin-in-the-acute-respiratory-distress-syndrome
#10
Thomas S Metkus, Eliseo Guallar, Lori Sokoll, David Morrow, Gordon Tomaselli, Roy Brower, Steven Schulman, Frederick K Korley
OBJECTIVE: Circulating cardiac troponin has been associated with adverse prognosis in the acute respiratory distress syndrome in small and single-center studies; however, comprehensive studies of myocardial injury in acute respiratory distress syndrome using modern high-sensitivity troponin assays, which can detect troponin at much lower circulating concentrations, have not been performed. DESIGN: We performed a prospective cohort study. SETTING: We included patients enrolled in previously completed trials of acute respiratory distress syndrome...
August 2, 2017: Critical Care Medicine
https://www.readbyqxmd.com/read/28764959/photoprotective-responses-in-a-brown-macroalgae-cystoseira-tamariscifolia-to-increases-in-co2-and-temperature
#11
Paula S M Celis-Plá, Brezo Martínez, Nathalie Korbee, Jason M Hall-Spencer, Félix L Figueroa
Global warming and ocean acidification are increasingly affecting coastal ecosystems, with impacts that vary regionally depending upon local biogeography. Ocean acidification drives shifts in seaweed community dominance that depend on interactions with other factors such as light and nutrients. In this study, we investigated the photophysiological responses in the brown macroalgae species Cystoseira tamariscifolia (Hudson) Papenfuss with important structural role in the coastal Mediterranean communities. These algae were collected in the Cabo de Gata-Nijar Natural Park in ultraoligotrophic waters (algae exposed under high irradiance and less nutrient conditions) vs...
July 20, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28762601/natural-acidification-changes-the-timing-and-rate-of-succession-alters-community-structure-and-increases-homogeneity-in-marine-biofouling-communities
#12
Norah E M Brown, Marco Milazzo, Sam P S Rastrick, Jason M Hall-Spencer, Thomas W Therriault, Christopher G D Harley
Ocean acidification may have far-reaching consequences for marine community and ecosystem dynamics, but its full impacts remain poorly understood due to the difficulty of manipulating pCO2 at the ecosystem level to mimic realistic fluctuations that occur on a number of different timescales. It is especially unclear how quickly communities at various stages of development respond to intermediate-scale pCO2 change and, if high pCO2 is relieved mid-succession, whether past acidification effects persist, are reversed by alleviation of pCO2 stress, or are worsened by departures from prior high pCO2 conditions to which organisms had acclimatized...
August 1, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28761526/a-study-of-partial-pressure-of-arterial-carbon-dioxide-and-end-tidal-carbon-dioxide-correlation-in-intraoperative-and-postoperative-period-in-neurosurgical-patients
#13
Pallavi Gaur, Minal Harde, Pinakin Gujjar, Devanand Deosarkar, Rakesh Bhadade
BACKGROUND AND AIM: Monitoring carbon dioxide (CO2) is of utmost importance in neurosurgical patients. It is measured by partial pressure of arterial CO2 (PaCO2) and end-tidal CO2 (ETCO2). We aimed to study the correlation between PaCO2 and ETCO2 in neurosurgical patients in the intraoperative and postoperative period on mechanical ventilation in Postanesthesia Care Unit (PACU). METHODOLOGY: This was prospective observational study done at tertiary care teaching public hospital over a period of 1 year...
July 2017: Asian Journal of Neurosurgery
https://www.readbyqxmd.com/read/28761136/effects-of-elevated-co2-on-phytoplankton-during-a-mesocosm-experiment-in-the-southern-eutrophicated-coastal-water-of-china
#14
Xin Liu, Yan Li, Yaping Wu, Bangqin Huang, Minhan Dai, Feixue Fu, David A Hutchins, Kunshan Gao
There is a growing consensus that the ongoing increase in atmospheric CO2 level will lead to a variety of effects on marine phytoplankton and ecosystems. However, the effects of CO2 enrichment on eutrophic coastal waters are still unclear, as are the complex mechanisms coupled to the development of eutrophication. Here, we report the first mesocosm CO2 perturbation study in a eutrophic subtropical bay during summer by investigating the effect of rising CO2 on a model artificial community consisting of well-characterized cultured diatoms (Phaeodactylum tricornutum and Thalassiosira weissflogii) and prymnesiophytes (Emiliania huxleyi and Gephyrocapsa oceanica)...
July 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28760954/glacial-weathering-sulfide-oxidation-and-global-carbon-cycle-feedbacks
#15
Mark A Torres, Nils Moosdorf, Jens Hartmann, Jess F Adkins, A Joshua West
Connections between glaciation, chemical weathering, and the global carbon cycle could steer the evolution of global climate over geologic time, but even the directionality of feedbacks in this system remain to be resolved. Here, we assemble a compilation of hydrochemical data from glacierized catchments, use this data to evaluate the dominant chemical reactions associated with glacial weathering, and explore the implications for long-term geochemical cycles. Weathering yields from catchments in our compilation are higher than the global average, which results, in part, from higher runoff in glaciated catchments...
August 15, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28756185/behavioural-physiological-and-biochemical-responses-to-aquatic-hypoxia-in-the-freshwater-crayfish-paranephrops-zealandicus
#16
Rebecca J Broughton, Islay D Marsden, Jonathan V Hill, Chris N Glover
Hypoxia resulting from aquatic eutrophication threatens the population health of the New Zealand freshwater crayfish (koura), Paranephrops zealandicus. An integrated study, combining behavioural, physiological and biochemical approaches, was therefore conducted to characterise the tolerance of this species to hypoxia. When provided with a choice between water flows of high or low dissolved oxygen in short-term laboratory assays, crayfish did not preferentially inhabit waters of higher PO2. However, when an aerial refuge was provided and dissolved oxygen was progressively decreased, crayfish emersed at a PO2 of 0...
July 27, 2017: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://www.readbyqxmd.com/read/28755724/effects-of-elevated-co2-on-phytoplankton-community-biomass-and-species-composition-during-a-spring-phaeocystis-spp-bloom-in-the-western-english-channel
#17
Matthew Keys, Gavin Tilstone, Helen S Findlay, Claire E Widdicombe, Tracy Lawson
A 21-year time series of phytoplankton community structure was analysed in relation to Phaeocystis spp. to elucidate its contribution to the annual carbon budget at station L4 in the western English Channel (WEC). Between 1993-2014 Phaeocystis spp. contributed ∼4.6% of the annual phytoplankton carbon and during the March - May spring bloom, the mean Phaeocystis spp. biomass constituted 17% with a maximal contribution of 47% in 2001. Upper maximal weekly values above the time series mean ranged from 63 to 82% of the total phytoplankton carbon (∼42-137mg carbon (C)m(-3)) with significant inter-annual variability in Phaeocystis spp...
July 2017: Harmful Algae
https://www.readbyqxmd.com/read/28750793/ocean-acidification-hampers-sperm-egg-collisions-gamete-fusion-and-generation-of-ca-2-oscillations-of-a-broadcast-spawning-bivalve-tegillarca-granosa
#18
Wei Shi, Yu Han, Cheng Guo, Xinguo Zhao, Saixi Liu, Wenhao Su, Yichen Wang, Shanjie Zha, Xueliang Chai, Guangxu Liu
Although the effect of ocean acidification on fertilization success of marine organisms is increasingly well documented, the underlying mechanisms are not completely understood. The fertilization success of broadcast spawning invertebrates depends on successful sperm-egg collisions, gamete fusion, and standard generation of Ca(2+) oscillations. Therefore, the realistic effects of future ocean pCO2 levels on these specific aspects of fertilization of Tegillarca granosa were investigated in the present study through sperm velocity trials, fertilization kinetics model analysis, and intracellular Ca(2+) assays, respectively...
July 20, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28749274/evaluation-of-the-i-stat-portable-clinical-analyzer-for-measurement-of-ionized-calcium-and-selected-blood-chemistry-values-in-asian-elephants-elephas-maximus
#19
Danielle K Tarbert, Erica Behling-Kelly, Heather Priest, Sara Childs-Sanford
Thei-STAT® portable clinical analyzer (PCA) provides patient-side results for hematologic, biochemical, and blood gas values when immediate results are desired. This analyzer is commonly used in nondomestic animals; however, validation of this method in comparison with traditional benchtop methods should be performed for each species. In this study, the i-STAT PCA was compared with the Radiometer ABL 800 Flex benchtop analyzer using 24 heparinized whole blood samples obtained from healthy E. maximus . In addition, the effect of sample storage was evaluated on the i-STAT PCA...
June 2017: Journal of Zoo and Wildlife Medicine: Official Publication of the American Association of Zoo Veterinarians
https://www.readbyqxmd.com/read/28748644/diversity-and-stability-of-coral-endolithic-microbial-communities-at-a-naturally-high-pco2-reef
#20
Vanessa R Marcelino, Kathleen M Morrow, Madeleine J H van Oppen, David G Bourne, Heroen Verbruggen
The health and functioning of reef-building corals is dependent on a balanced association with prokaryotic and eukaryotic microbes. The coral skeleton harbours numerous endolithic microbes, but their diversity, ecological roles and responses to environmental stress, including ocean acidification, are not well characterized. This study tests whether pH affects the diversity and structure of prokaryotic and eukaryotic algal communities associated with skeletons of Porites spp. using targeted amplicon (16S rRNA gene, UPA and tufA) sequencing...
July 27, 2017: Molecular Ecology
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