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Acclimation

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https://www.readbyqxmd.com/read/28215046/genome-resolved-metagenomics-of-a-bioremediation-system-for-degradation-of-thiocyanate-in-mine-water-containing-suspended-solid-tailings
#1
Sumayah F Rahman, Rose S Kantor, Robert Huddy, Brian C Thomas, Andries W van Zyl, Susan T L Harrison, Jillian F Banfield
Thiocyanate (SCN(-) ) is a toxic compound that forms when cyanide (CN(-) ), used to recover gold, reacts with sulfur species. SCN(-) -degrading microbial communities have been studied, using bioreactors fed synthetic wastewater. The inclusion of suspended solids in the form of mineral tailings, during the development of the acclimatized microbial consortium, led to the selection of an active planktonic microbial community. Preliminary analysis of the community composition revealed reduced microbial diversity relative to the laboratory-based reactors operated without suspended solids...
February 19, 2017: MicrobiologyOpen
https://www.readbyqxmd.com/read/28214919/grapevine-acclimation-to-water-deficit-the-adjustment-of-stomatal-and-hydraulic-conductance-differs-from-petiole-embolism-vulnerability
#2
Uri Hochberg, Andrea Giulia Bonel, Rakefet David-Schwartz, Asfaw Degu, Aaron Fait, Hervé Cochard, Enrico Peterlunger, Jose Carlos Herrera
Drought-acclimated vines maintained higher gas exchange compared to irrigated controls under water deficit; this effect is associated with modified leaf turgor but not with improved petiole vulnerability to cavitation. A key feature for the prosperity of plants under changing environments is the plasticity of their hydraulic system. In the present research we studied the hydraulic regulation in grapevines (Vitis vinifera L.) that were first acclimated for 39 days to well-watered (WW), sustained water deficit (SD), or transient-cycles of dehydration-rehydration-water deficit (TD) conditions, and then subjected to varying degrees of drought...
February 18, 2017: Planta
https://www.readbyqxmd.com/read/28214874/heat-acclimation-regulates-the-autophagy-lysosome-function-to-protect-against-heat-stroke-induced-brain-injury-in-mice
#3
Junfeng Yi, Genlin He, Ju Yang, Zhen Luo, Xuesen Yang, Xue Luo
BACKGROUND/AIMS: The mechanisms underlying the protective role of heat acclimation (HA) in heat stroke (HS)-induced brain injury are still unclear. The autophagy-lysosome pathway is known to pay an important role in protecting stressed or diseased cells from death. Nevertheless, whether autophagy and lysosomes are involved in HA-mediated neuroprotection following HS exposure remains unclear. METHODS: The protective effects of HA were assessed by rectal temperature, hematoxylin-eosin staining, transmission electron microscopic analysis, terminal deoxynucleotidyl transferase-mediated dUTP nick end-labeling staining, and Fluoro Jade B staining, after mice were subjected to HS...
January 18, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28214359/gene-expression-plasticity-in-response-to-salinity-acclimation-in-threespine-stickleback-ecotypes-from-different-salinity-habitats
#4
Taylor C Gibbons, David C H Metzger, Timothy M Healy, Patricia M Schulte
Phenotypic plasticity is thought to facilitate the colonization of novel environments and shape the direction of evolution in colonizing populations. However, the relative prevalence of various predicted patterns of changes in phenotypic plasticity following colonization remain unclear. Here we use a whole-transcriptome approach to characterize patterns of gene expression plasticity in the gills of a freshwater-adapted and a saltwater-adapted ecotype of threespine stickleback (Gasterosteus aculeatus) exposed to a range of salinities...
February 18, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28212894/exogenous-thyroid-hormones-regulate-the-activity-of-citrate-synthase-and-cytochrome-c-oxidase-in-warm-but-not-cold-acclimated-lake-whitefish-coregonus-clupeaformis
#5
Megan A Zak, Amy M Regish, Stephen D McCormick, Richard G Manzon
Thermal acclimation is known to elicit metabolic adjustments in ectotherms, but the cellular mechanisms and endocrine control of these shifts have not been fully elucidated. Here we examined the relationship between thermal acclimation, thyroid hormones and oxidative metabolism in juvenile lake whitefish. Impacts of thermal acclimation above (19 °C) or below (8 °C) the thermal optimum (13 °C) and exposure to exogenous thyroid hormone (60 µg T4/g body weight) were assessed by quantifying citrate synthase and cytochrome c oxidase activities in liver, red muscle, white muscle and heart...
February 14, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28212376/the-legionella-pneumophila-genome-evolved-to-accommodate-multiple-regulatory-mechanisms-controlled-by-the-csra-system
#6
Tobias Sahr, Christophe Rusniok, Francis Impens, Giulia Oliva, Odile Sismeiro, Jean-Yves Coppée, Carmen Buchrieser
The carbon storage regulator protein CsrA regulates cellular processes post-transcriptionally by binding to target-RNAs altering translation efficiency and/or their stability. Here we identified and analyzed the direct targets of CsrA in the human pathogen Legionella pneumophila. Genome wide transcriptome, proteome and RNA-Co-immunoprecipitaion followed by deep sequencing of a wild type and a csrA mutant strain identified 479 RNAs with potential CsrA interaction sites located in the untranslated and/or coding regions of mRNAs or of known non-coding sRNAs...
February 17, 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28211527/depth-specific-fluctuations-of-gene-expression-and-protein-abundance-modulate-the-photophysiology-in-the-seagrass-posidonia-oceanica
#7
Gabriele Procaccini, Miriam Ruocco, Lázaro Marín-Guirao, Emanuela Dattolo, Christophe Brunet, Daniela D'Esposito, Chiara Lauritano, Silvia Mazzuca, Ilia Anna Serra, Letizia Bernardo, Amalia Piro, Sven Beer, Mats Björk, Martin Gullström, Pimchanok Buapet, Lina M Rasmusson, Paulo Felisberto, Sylvie Gobert, John W Runcie, João Silva, Irene Olivé, Monya M Costa, Isabel Barrote, Rui Santos
Here we present the results of a multiple organizational level analysis conceived to identify acclimative/adaptive strategies exhibited by the seagrass Posidonia oceanica to the daily fluctuations in the light environment, at contrasting depths. We assessed changes in photophysiological parameters, leaf respiration, pigments, and protein and mRNA expression levels. The results show that the diel oscillations of P. oceanica photophysiological and respiratory responses were related to transcripts and proteins expression of the genes involved in those processes and that there was a response asynchrony between shallow and deep plants probably caused by the strong differences in the light environment...
February 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28211053/q10-measures-of-metabolic-performance-and-critical-swimming-speed-in-king-george-whiting-sillaginodes-punctatus
#8
N Mazloumi, J L Johansen, Z A Doubleday, B M Gillanders
This study examined thermally driven changes in swimming performance and aerobic metabolism (Q10 and aerobic scope of activity) of adult King George whiting Sillaginodes punctatus to the coldest (16° C) and the warmest (26° C) temperature encountered by this species. Compensation of aerobic scope, higher maximal swimming speeds and a maintained capacity to repay oxygen debt indicate that this species is capable of thermal acclimation to conditions expected under global warming.
February 16, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28202683/adult-exposure-to-ocean-acidification-is-maladaptive-for-larvae-of-the-sydney-rock-oyster-saccostrea-glomerata-in-the-presence-of-multiple-stressors
#9
Laura M Parker, Wayne A O'Connor, Maria Byrne, Ross A Coleman, Patti Virtue, Michael Dove, Mitchell Gibbs, Lorraine Spohr, Elliot Scanes, Pauline M Ross
Parental effects passed from adults to their offspring have been identified as a source of rapid acclimation that may allow marine populations to persist as our surface oceans continue to decrease in pH. Little is known, however, whether parental effects are beneficial for offspring in the presence of multiple stressors. We exposed adults of the oyster Saccostrea glomerata to elevated CO2 and examined the impacts of elevated CO2 (control = 392; 856 µatm) combined with elevated temperature (control = 24; 28°C), reduced salinity (control = 35; 25) and reduced food concentration (control = full; half diet) on their larvae...
February 2017: Biology Letters
https://www.readbyqxmd.com/read/28202582/dynamic-changes-in-cardiac-mitochondrial-metabolism-during-warm-acclimation-in-rainbow-trout
#10
Nicolas Pichaud, Andreas Ekström, Kim Hellgren, Erik Sandblom
Although the mitochondrial metabolism responses to warm acclimation have been widely studied in fish, the time course of this process is less understood. Here, we characterise changes of rainbow trout (Oncorhyncus mykiss) cardiac mitochondrial metabolism during acute warming from 10 to 16°C, and during the subsequent warm acclimation for 39 days (D). We repeatedly measured mitochondrial O2 consumption in cardiac permeabilized fibers and functional integrity of mitochondria (i.e. mitochondrial coupling and cytochrome c effect) at two assay temperatures (10 and 16°C), as well as citrate synthase (CS) and lactate dehydrogenase (LDH) activities at room temperature...
February 15, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28202362/effects-of-crude-extracts-of-a-saxitoxin-producer-strain-of-the-cyanobacterium-cylindrospermopsis-raciborskii-on-the-swimming-behavior-of-wild-and-laboratory-reared-guppy-poecilia-vivipara
#11
Karina C Lopes, Aloysio da S Ferrão-Filho, Everton G N Dos Santos, Rodolfo A Cunha, Cláudia P Santos
The cyanobacterium Cylindrospermopsis raciborskii is an invasive species in water supply reservoirs worldwide, which can produces cylindrospermopsins and saxitoxins. In the wild, guppy (Poecilia vivipara) can be exposed to cyanotoxins, but those born and reared in laboratory are free of this contact. The aim of this paper was to comparatively measure the locomotor activity of 'wild' and 'lab' P. vivipara before and after exposure to crude extracts of two different cultures of C. raciborskii (CYRF-01), a saxitoxin-procucer strain...
February 12, 2017: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/28198181/mineralogical-plasticity-acts-as-a-compensatory-mechanism-to-the-impacts-of-ocean-acidification
#12
Jonathan Y S Leung, Bayden D Russell, Sean D Connell
Calcifying organisms are considered particularly susceptible to the future impacts of ocean acidification (OA), but recent evidence suggests that they may be able to maintain calcification and overall fitness. The underlying mechanism remains unclear but may be attributed to mineralogical plasticity, which modifies the energetic cost of calcification. To test the hypothesis that mineralogical plasticity enables the maintenance of shell growth and functionality under OA conditions, we assessed the biological performance of a gastropod (respiration rate, feeding rate, somatic growth, and shell growth of Austrocochlea constricta) and analyzed its shell mechanical and geochemical properties (shell hardness, elastic modulus, amorphous calcium carbonate, calcite to aragonite ratio, and magnesium to calcium ratio)...
February 15, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28188552/enhanced-biodegradation-of-low-and-high-density-polyethylene-by-novel-bacterial-consortia-formulated-from-plastic-contaminated-cow-dung-under-thermophilic-conditions
#13
Sinosh Skariyachan, Anagha Shamsundar Setlur, Sujay Yashwant Naik, Ashwini Amaresh Naik, Makam Usharani, Kiran S Vasist
The current study aimed to devise eco-friendly, safe, and cost-effective strategies for enhanced degradation of low- and high-density polyethylene (LDPE and HDPE) using newly formulated thermophilic microbial consortia from cow dung and to assess the biodegradation end products. The plastic-degrading bacteria from cow dung samples gathered from highly plastic-acclimated environments were enriched by standard protocols. The degradation ability was comprehended by zone of clearance method, and the percentage of degradation was monitored by weight reduction process...
February 10, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28188297/alternative-splicing-in-the-cytochrome-p450-superfamily-expands-protein-diversity-to-augment-gene-function-and-redirect-human-drug-metabolism
#14
Andrew J Annalora, Craig B Marcus, Patrick L Iversen
The human genome encodes 57 cytochrome P450 (CYP) genes whose enzyme products metabolize hundreds of drugs, thousands of xenobiotics and unknown numbers of endogenous compounds including steroids, retinoids and icosinoids. Indeed, CYP genes are the first line of defense against daily environmental chemical challenges in a manner that parallels the immune system. Several databases, including PubMed, AceView, and Ensembl, were queried to establish a comprehensive analysis of the full human CYP transcriptome. This review describes a remarkable diversification of the 57 human CYP genes, which may be alternatively processed into nearly 1000 distinct mRNA transcripts to shape an individual's CYP proteome...
February 10, 2017: Drug Metabolism and Disposition: the Biological Fate of Chemicals
https://www.readbyqxmd.com/read/28184008/importance-of-fluctuations-in-light-on-plant-photosynthetic-acclimation
#15
Silvere Rm Vialet-Chabrand, Jack Sa Matthews, Andrew Simkin, Christine A Raines, Tracy Lawson
Acclimation of plants to light has been studied extensively, yet little is known about the effect of dynamic fluctuations in light on plant phenotype and acclimatory responses. We mimicked natural fluctuations in light over a diurnal period to examine the effect on photosynthetic processes and growth of Arabidopsis thaliana. High and low light intensities, delivered via a realistic dynamic fluctuating or square wave pattern were used to grow and assess plants. Plants subjected to square wave light had thicker leaves and greater photosynthetic capacity compared with fluctuating light grown plants...
February 9, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28179913/potential-responses-of-vascular-plants-from-the-pristine-lost-world-of-the-neotropical-guayana-highlands-to-global-warming-review-and-new-perspectives
#16
REVIEW
Valentí Rull, Teresa Vegas-Vilarrúbia
The neotropical Guayana Highlands (GH) are one of the few remaining pristine environments on Earth, and they host amazing biodiversity with a high degree endemism, especially among vascular plants. Despite the lack of direct human disturbance, GH plants and their communities are threatened with extinction from habitat loss due to global warming (GW). Geographic information systems simulations involving the entire known vascular GH flora (>2430 species) predict potential GW-driven extinctions on the order of 80% by the end of this century, including nearly half of the endemic species...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28179140/temperature-dependent-growth-feeding-nutritional-condition-and-aerobic-metabolism-of-juvenile-spiny-lobster-sagmariasus-verreauxi
#17
Quinn P Fitzgibbon, Cedric J Simon, Gregory G Smith, Chris G Carter, Stephen C Battaglene
We examined the effects of temperature on the growth, feeding, nutritional condition and aerobic metabolism of juvenile spiny lobster, Sagmariasus verreauxi, in order to determine if temperature acclimated aerobic scope correlates with optimum for growth and to establish the thermal tolerance window for this emerging aquaculture species. Juvenile lobsters (initial weight=10.95±0.47g) were reared (n=7) at temperatures from 11.0 to 28.5°C for 145days. All lobsters survived from 14.5 to 25.0°C while survival was reduced at 11...
February 5, 2017: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://www.readbyqxmd.com/read/28177747/short-term-heat-acclimation-improves-the-determinants-of-endurance-performance-and-5-000-m-running-performance-in-the-heat
#18
Carl Alexander James, Alan J Richardson, Peter W Watt, Ashley G B Willmott, Oliver R Gibson, Neil S Maxwell
This study investigated the effect of 5 days controlled hyperthermia heat acclimation (STHA) on the determinants of endurance performance and 5 km performance in runners, relative to the impairment afforded by moderate heat stress. A control group (CON), matched for total work and power output (2.7 W.kg-1), differentiated thermal and exercise contributions of STHA on exercise performance. Seventeen participants (10 STHA, 7 CON) completed graded exercise tests (GXT) in cool (13°C, 50% RH, pre training) and hot conditions (32°C, 60% RH, pre and post training), as well as 5 km time trials (TT) in the heat, pre and post training...
November 18, 2016: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28177370/fermentation-products-as-feed-additives-mitigate-some-ill-effects-of-heat-stress-in-pigs
#19
S Kumar, B E Bass, M Bandrick, C L Loving, S L Brockmeier, T Looft, J Trachsel, D M Madson, M Thomas, T A Casey, J W Frank, T B Stanton, H K Allen
Heat stress (HS) may result in economic losses to pig producers across the USA and worldwide. Despite significant advancements in management practices, HS continues to be a challenge. In this study, an in-feed antibiotic (carbadox, CBX) and antibiotic alternatives ( [XPC], and [SGX] fermentation products) were evaluated in a standard pig starter diet as mitigations against the negative effects of HS in pigs. A total of 100 gilts were obtained at weaning (6.87 ± 0.82 kg BW, 19.36 ± 0.72 d of age) and randomly assigned to dietary treatments (2 rooms/treatment, 2 pens/room, 6 to 7 pigs/pen)...
January 2017: Journal of Animal Science
https://www.readbyqxmd.com/read/28176042/acclimation-of-shade-tolerant-and-light-resistant-tradescantia-species-to-growth-light-chlorophyll-a-fluorescence-electron-transport-and-xanthophyll-content
#20
Vladimir I Mishanin, Boris V Trubitsin, Svetlana V Patsaeva, Vasily V Ptushenko, Alexei E Solovchenko, Alexander N Tikhonov
In this study, we have compared the photosynthetic characteristics of two contrasting species of Tradescantia plants, T. fluminensis (shade-tolerant species), and T. sillamontana (light-resistant species), grown under the low light (LL, 50-125 µmol photons m(-2) s(-1)) or high light (HL, 875-1000 µmol photons m(-2) s(-1)) conditions during their entire growth period. For monitoring the functional state of photosynthetic apparatus (PSA), we measured chlorophyll (Chl) a emission fluorescence spectra and kinetics of light-induced changes in the heights of fluorescence peaks at 685 and 740 nm (F 685 and F 740)...
February 8, 2017: Photosynthesis Research
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