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https://www.readbyqxmd.com/read/28430794/experimental-demonstration-of-a-trophic-cascade-in-the-gal%C3%A3-pagos-rocky-subtidal-effects-of-consumer-identity-and-behavior
#1
Jon D Witman, Franz Smith, Mark Novak
In diverse tropical webs, trophic cascades are presumed to be rare, as species interactions may dampen top-down control and reduce their prevalence. To test this hypothesis, we used an open experimental design in the Galápagos rocky subtidal that enabled a diverse guild of fish species, in the presence of each other and top predators (sea lions and sharks), to attack two species of sea urchins grazing on benthic algae. Time-lapse photography of experiments on natural and experimental substrates revealed strong species identity effects: only two predator species-blunthead triggerfish (Pseudobalistes naufragium) and finescale triggerfish (Balistes polylepis)-drove a diurnal trophic cascade extending to algae, and they preferred large pencil urchins (Eucidaris galapagensis) over green urchins (Lytechinus semituberculatus)...
2017: PloS One
https://www.readbyqxmd.com/read/28430522/impact-of-naturalistic-lighting-on-hospitalized-stroke-patients-in-a-rehabilitation-unit-design-and-measurement
#2
Anders West, Poul Jennum, Sofie Amalie Simonsen, Birgit Sander, Milena Pavlova, Helle K Iversen
INTRODUCTION AND RATIONALE: Stroke is a major cause of acquired cerebral disability among adults, frequently accompanied by depression, anxiety, cognitive impairment, disrupted sleep and fatigue. New ways of intervention to prevent these complications are therefore needed. The major circadian regulator, the suprachiasmatic nucleus, is mainly controlled by natural daylight, and the blue spectrum is considered the most powerful. During stroke rehabilitation, patients typically are mostly indoors and therefore not exposed to the natural daytime variation in light intensity...
April 21, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28429296/diurnal-changes-in-transcript-and-metabolite-levels-during-the-iron-deficiency-response-of-rice
#3
Jamie Selby-Pham, Adrian Lutz, Laura T Moreno-Moyano, Berin A Boughton, Ute Roessner, Alexander A T Johnson
BACKGROUND: Rice (Oryza sativa L.) is highly susceptible to iron (Fe) deficiency due to low secretion levels of the mugineic acid (MA) family phytosiderophore (PS) 2'-deoxymugineic acid (DMA) into the rhizosphere. The low levels of DMA secreted by rice have proved challenging to measure and, therefore, the pattern of DMA secretion under Fe deficiency has been less extensively studied relative to other graminaceous monocot species that secrete high levels of PS, such as barley (Hordeum vulgare L...
December 2017: Rice
https://www.readbyqxmd.com/read/28428757/circadian-rhythm-in-kidney-tissue-oxygenation-in-the-rat
#4
Tonja W Emans, Ben J Janssen, Jaap A Joles, C T Paul Krediet
Blood pressure, renal hemodynamics, electrolyte, and water excretion all display diurnal oscillation. Disturbance of these patterns is associated with hypertension and chronic kidney disease. Kidney oxygenation is dependent on oxygen delivery and consumption that in turn are determined by renal hemodynamics and metabolism. We hypothesized that kidney oxygenation also demonstrates 24-h periodicity. Telemetric oxygen-sensitive carbon paste electrodes were implanted in Sprague-Dawley rats (250-300 g), either in renal medulla (n = 9) or cortex (n = 7)...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28428698/circadian-periodicity-of-circulating-plasma-lipid-peroxides-uric-acid-and-ascorbic-acid-in-renal-stone-formers
#5
Rajeev Singh Kushwaha, R C Gupta, J P Sharma, Sumita Sharma, Raj Kumar Singh, Germaine Cornelissen
Circadian periodicity of plasma lipid peroxides and serum ascorbic acid and uric acid levels were studied in one hundred renal stone formers (55 women and 45 men; age 20-60 years) and 50 clinically healthy volunteers (21 women and 29 men; age 21-45 years) with diurnal activity from 06:00 to 22:00 and nocturnal rest. A marked circadian variation was demonstrated by population-mean-cosinor for all studied variables in stone formers and healthy subjects. By comparison to the healthy controls, parameter tests indicate that the stone formers had a higher MESOR (±SE) of MDA (2...
June 2017: Indian Journal of Clinical Biochemistry: IJCB
https://www.readbyqxmd.com/read/28427386/heterogeneous-distributional-responses-to-climate-warming-evidence-from-rodents-along-a-subtropical-elevational-gradient
#6
Zhixin Wen, Yi Wu, Deyan Ge, Jilong Cheng, Yongbin Chang, Zhisong Yang, Lin Xia, Qisen Yang
BACKGROUND: Understanding whether species' elevational range is shifting in response to directional changes in climate and whether there is a predictable pattern in that response is one of the major challenges in ecology. However, so far very little is known about the distributional responses of subtropical species to climate change, especially for small mammals. In this study, we examined the elevational range shifts at three range points (upper and lower range limits and abundance-weighted range centre) of rodents over a 30-year period (1986 to 2014-2015), in a subtropical forest of Southwest China...
April 20, 2017: BMC Ecology
https://www.readbyqxmd.com/read/28425739/sleep-duration-partially-accounts-for-race-differences-in-diurnal-cortisol-dynamics
#7
Laurel M Peterson, Karissa G Miller, Patricia M Wong, Barbara P Anderson, Thomas W Kamarck, Karen A Matthews, Clemens Kirschbaum, Stephen B Manuck
OBJECTIVE: Emerging research demonstrates race differences in diurnal cortisol slope, an indicator of hypothalamic-pituitary-adrenocortical (HPA)-axis functioning associated with morbidity and mortality, with African Americans showing flatter diurnal slopes than their White counterparts. Sleep characteristics are associated with both race and with HPA-axis functioning. The present report examines whether sleep duration may account for race differences in cortisol dynamics. METHOD: Participants were 424 employed African American and White adults (mean age = 42...
May 2017: Health Psychology: Official Journal of the Division of Health Psychology, American Psychological Association
https://www.readbyqxmd.com/read/28425474/invasion-of-ancestral-mammals-into-dim-light-environments-inferred-from-adaptive-evolution-of-the-phototransduction-genes
#8
Yonghua Wu, Haifeng Wang, Elizabeth A Hadly
Nocturnality is a key evolutionary innovation of mammals that enables mammals to occupy relatively empty nocturnal niches. Invasion of ancestral mammals into nocturnality has long been inferred from the phylogenetic relationships of crown Mammalia, which is primarily nocturnal, and crown Reptilia, which is primarily diurnal, although molecular evidence for this is lacking. Here we used phylogenetic analyses of the vision genes involved in the phototransduction pathway to predict the diel activity patterns of ancestral mammals and reptiles...
April 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28425439/activation-of-the-hypothalamic-feeding-centre-upon-visual-prey-detection
#9
Akira Muto, Pradeep Lal, Deepak Ailani, Gembu Abe, Mari Itoh, Koichi Kawakami
The visual system plays a major role in food/prey recognition in diurnal animals, and food intake is regulated by the hypothalamus. However, whether and how visual information about prey is conveyed to the hypothalamic feeding centre is largely unknown. Here we perform real-time imaging of neuronal activity in freely behaving or constrained zebrafish larvae and demonstrate that prey or prey-like visual stimuli activate the hypothalamic feeding centre. Furthermore, we identify prey detector neurons in the pretectal area that project to the hypothalamic feeding centre...
April 20, 2017: Nature Communications
https://www.readbyqxmd.com/read/28424676/seasonal-fluctuations-of-microbial-aerosol-in-live-poultry-markets-and-the-detection-of-endotoxin
#10
Bo Wu, Kai Meng, Liangmeng Wei, Yumei Cai, Tongjie Chai
Microbial aerosol whose species and concentrations are closely related to human health is ubiquitous. The effect of microbes on human and animal health and production performance is, in many cases, caused by the spreading of air. Samples in this experiment were from a live poultry market (LPM) in Tai'an, China, collected three times a day (8 am, 14 pm, and 20 pm) over three consecutive days each month for 11 months (Original sampling plan was a year, the government due to the environmental protection, the was LPM closed)...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28423428/aggregation-behavior-and-a-putative-aggregation-pheromone-in-sugar-beet-root-maggot-flies-diptera-ulidiidae
#11
Erik J Wenninger, Susan Y Emmert, Kelly Tindall, Hongjian Ding, Mark A Boetel, D Rajabaskar, Sanford D Eigenbrode
Male-biased aggregations of sugar beet root maggot, Tetanops myopaeformis (Röder) (Diptera: Ulidiidae), flies were observed on utility poles near sugar beet (Beta vulgaris L. [Chenopodiaceae]) fields in southern Idaho; this contrasts with the approximately equal sex ratio typically observed within fields. Peak observation of mating pairs coincided with peak diurnal abundance of flies. Volatiles released by individual male and female flies were sampled from 08:00 to 24:00 hours in the laboratory using solid-phase microextraction and analyzed using gas chromatography/mass spectrometry (GC/MS)...
January 1, 2017: Journal of Insect Science
https://www.readbyqxmd.com/read/28421270/climate-variability-impacts-on-rainfed-cereal-yields-in-west-and-northwest-iran
#12
Milad Nouri, Mehdi Homaee, Mohammad Bannayan
In order to assess the response of wheat and barley to climate variability, the correlation between variations of yields with local and global climate variables was investigated in west and northwest Iran over 1982-2013. The global climate variables were the El Niño-Southern Oscillation (ENSO), Arctic Oscillation (AO), and North Atlantic Oscillation (NAO) signals. Further, minimum (T min), maximum (T max), and mean (T mean) temperature, diurnal temperature range (DTR), precipitation, and reference evapotranspiration (ET0) was used as local weather factors...
April 18, 2017: International Journal of Biometeorology
https://www.readbyqxmd.com/read/28420744/the-transcription-factor-bzip14-regulates-the-tca-cycle-in-the-diatom-phaeodactylum-tricornutum
#13
Michiel Matthijs, Michele Fabris, Toshihiro Obata, Imogen Foubert, José Manuel Franco-Zorrilla, Roberto Solano, Alisdair R Fernie, Wim Vyverman, Alain Goossens
Diatoms are amongst the most important marine microalgae in terms of biomass, but little is known concerning the molecular mechanisms that regulate their versatile metabolism. Here, the pennate diatom Phaeodactylum tricornutum was studied at the metabolite and transcriptome level during nitrogen starvation and following imposition of three other stresses that impede growth. The coordinated upregulation of the tricarboxylic acid (TCA) cycle during the nitrogen stress response was the most striking observation...
April 18, 2017: EMBO Journal
https://www.readbyqxmd.com/read/28420509/effect-of-a-gymnastics-program-on-sleep-characteristics-in-pregnant-women
#14
Ildikó Kocsis, Tibor Szilágyi, János Turos, Aliz Bakó, Attila Frigy
OBJECTIVE: The quality and quantity of sleep represent important health issues in pregnant women. Sleep disturbances could be associated, beyond alteration of quality of life, with poor pregnancy outcome. Our aim was to investigate the effect of a regular, specific, medium-term physical training program on sleep characteristics in healthy pregnant women. MATERIALS AND METHODS: A total of 132 healthy pregnant women, with gestational age between 18 weeks and 22 weeks, were enrolled in a prospective study...
April 2017: Taiwanese Journal of Obstetrics & Gynecology
https://www.readbyqxmd.com/read/28419643/post-lunch-triglyceridaemia-associates-with-hdlc-and-insulin-resistance-in-fasting-normotriglyceridaemic-menopausal-women
#15
A Sanz-Paris, A Rodriguez-Valle, M A Navarro, J Puzo-Foncillas, J M Arbones-Mainar
OBJECTIVES: Post-prandial hypertriglyceridaemia (P-HTG) is associated with cardiovascular disease. This association is of paramount importance during menopause, which is also related to reduced high-density lipoprotein-cholesterol (HDLc) and elevated triglyceride (TG) levels. We aimed to provide a self-assesing tool to screen for P-HTG in menopausal women who were normotriglyceridaemic at fasting and adhered to a Mediterranean-style eating pattern. METHODS: We performed oral fat loading tests (OFLT) in combination with self-measurements of diurnal capillary TG at fixed time-points (DC-TG) in 29 healthy menopausal women...
April 17, 2017: Journal of Human Nutrition and Dietetics: the Official Journal of the British Dietetic Association
https://www.readbyqxmd.com/read/28419597/growth-rate-correlates-negatively-with-protein-turnover-in-arabidopsis-accessions
#16
Hirofumi Ishihara, Thiago Alexandre Moraes, Eva-Theresa Pyl, Waltraud X Schulze, Toshihiro Obata, André Scheffel, Alisdair R Fernie, Ronan Sulpice, Mark Stitt
Previous studies with Arabidopsis accessions revealed biomass correlates negatively to dusk starch content and total protein, and positively to the maximum activities of enzymes in photosynthesis. We hypothesised that large accessions have lower ribosome abundance and lower rates of protein synthesis, and that this is compensated by lower rates of protein degradation. This would increase growth efficiency and allow more investment in photosynthetic machinery. We analysed ribosome abundance and polysome loading in 19 accessions, modelled the rates of protein synthesis and compared them with the observed rate of growth...
April 17, 2017: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/28417562/climate-variability-drives-recent-tree-mortality-in-europe
#17
Mathias Neumann, Volker Mues, Adam Moreno, Hubert Hasenauer, Rupert Seidl
Tree mortality is an important process in forest ecosystems, frequently hypothesized to be highly climate sensitive. Yet, tree death remains one of the least understood processes of forest dynamics. Recently, changes in tree mortality have been observed in forests around the globe, which could profoundly affect ecosystem functioning and services provisioning to society. We describe continental-scale patterns of recent tree mortality from the only consistent pan-European forest monitoring network, identifying recent mortality hotspots in southern and northern Europe...
April 17, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28416704/diurnal-variation-in-gas-exchange-the-balance-between-carbon-fixation-and-water-loss
#18
Jack Sa Matthews, Silvere Rm Vialet-Chabrand, Tracy Lawson
No abstract text is available yet for this article.
April 17, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28414715/transcriptional-regulatory-logic-of-the-diurnal-cycle-in-the-mouse-liver
#19
Jonathan Aryeh Sobel, Irina Krier, Teemu Andersin, Sunil Raghav, Donatella Canella, Federica Gilardi, Alexandra Styliani Kalantzi, Guillaume Rey, Benjamin Weger, Frédéric Gachon, Matteo Dal Peraro, Nouria Hernandez, Ueli Schibler, Bart Deplancke, Felix Naef
Many organisms exhibit temporal rhythms in gene expression that propel diurnal cycles in physiology. In the liver of mammals, these rhythms are controlled by transcription-translation feedback loops of the core circadian clock and by feeding-fasting cycles. To better understand the regulatory interplay between the circadian clock and feeding rhythms, we mapped DNase I hypersensitive sites (DHSs) in the mouse liver during a diurnal cycle. The intensity of DNase I cleavages cycled at a substantial fraction of all DHSs, suggesting that DHSs harbor regulatory elements that control rhythmic transcription...
April 2017: PLoS Biology
https://www.readbyqxmd.com/read/28412030/simple-quantification-method-for-n-nitrosamines-in-atmospheric-particulates-based-on-facile-pretreatment-and-gc-ms-ms
#20
Youngmin Hong, Kyung Hwan Kim, Byoung-In Sang, Hyunook Kim
Nine N-nitrosamines (i.e., N-nitrosomethylamine, N-nitrosodiethylamine (NDEA), N-nitrosodimethylamine (NDMA), N-nitrosodi-n-propylamine (NDPA), N-nitrosomorpholine (NMor), N-nitrosopyrrolidine (NPyr), N-nitrosopiperidine (NPip), N-nitorosodi-n-butylamine (NDBA), and N-nitrosodiphenylamine (NDPhA) in atmospheric PM2.5 collected in the fall season from an roadside site and a residential in Seoul, Korea have been analyzed using a newly developed method consisting of simple direct liquid extraction assisted by ultrasonication and subsequent quantification using a gas chromatography-triple quadrupole mass spectrometry (GC-TQMS)...
April 13, 2017: Environmental Pollution
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