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https://www.readbyqxmd.com/read/28340476/temporal-patterns-of-co2-and-ch4-in-a-rural-area-in-northern-spain-described-by-a-harmonic-equation-over-2010-2016
#1
Beatriz Fernández-Duque, Isidro A Pérez, M Luisa Sánchez, M Ángeles García, Nuria Pardo
The present paper seeks to improve our knowledge concerning the evolution of CO2 and CH4 in terms of monthly trends, growth rate and seasonal variations in the lower atmosphere. Dry continuous measurements of CO2 and the CH4 mixing ratio were carried out over five and a half years (from 15 October 2010 to 29 February 2016) by multi-point sampling at 1.8, 3.7 and 8.3m, using a Picarro analyzer at a rural site in the Low Atmosphere Research Centre (CIBA), on the upper Spanish plateau. Data were divided into diurnal and nocturnal records...
March 21, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28338213/biochemical-model-of-c3-photosynthesis-applied-to-wheat-at-different-temperatures
#2
Viridiana Silva-Pérez, Robert T Furbank, Anthony G Condon, John R Evans
We examined the effects of leaf temperature on the estimation of maximal Rubisco capacity (Vcmax ) from gas exchange measurements of wheat leaves using a C3 photosynthesis model. Cultivars of spring wheat (Triticum aestivum (L)) and triticale (x Triticosecale Wittmack) were grown in a greenhouse or in the field and measured at a range of temperatures under controlled conditions in a growth cabinet (2 and 21 % O2 ) or in the field using natural diurnal variation in temperature, respectively. Published Rubisco kinetic constants for tobacco did not describe the observed CO2 response curves well as temperature varied...
March 24, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28335747/effects-of-diurnal-lighting-and-angle-of-incidence-variation-on-anterior-segment-optical-coherence-tomography-as-oct-angle-metrics
#3
Handan Akil, Anna Dastiridou, Kenneth Marion, Brian A Francis, Vikas Chopra
BACKGROUND: First reported study to assess the effect of diurnal variation on anterior chamber angle measurements, as well as, to re-test the effects of lighting and angle-of-incidence variation on anterior chamber angle (ACA) measurements acquired by time-domain anterior segment optical coherence tomography (AS-OCT). METHODS: A total of 30 eyes from 15 healthy, normal subjects underwent anterior chamber imaging using a Visante time-domain AS-OCT according to an IRB-approved protocol...
March 23, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/28334669/distribution-and-sea-to-air-flux-of-isoprene-in-the-east-china-sea-and-the-south-yellow-sea-during-summer
#4
Jian-Long Li, Hong-Hai Zhang, Gui-Peng Yang
Spatial distribution and sea-to-air flux of isoprene in the East China Sea and the South Yellow Sea in July 2013 were investigated. This study is the first to report the concentrations of isoprene in the China marginal seas. Isoprene concentrations in the surface seawater during summer ranged from 32.46 to 173.5 pM, with an average of 83.62 ± 29.22 pM. Distribution of isoprene in the study area was influenced by the diluted water from the Yangtze River, which stimulated higher in-situ phytoplankton production of isoprene rather than direct freshwater input...
March 20, 2017: Chemosphere
https://www.readbyqxmd.com/read/28333856/extreme-diurnal-variation-of-central-macular-thickness-in-diabetic-macular-edema
#5
Kumar Sambhav, Sandeep Grover, Kakarla V Chalam
PURPOSE: Spectral domain optical coherence tomography is an established modality to quantify diabetic macular edema (DME). Change in central subfield thickness exceeding 3% to 6% in DME is likely to be significant. In this case of DME, we describe an extreme bilateral variation in central macular thickness on spectral domain optical coherence tomography over two consecutive days without any treatment. METHODS: The patient with DME and nonproliferative diabetic retinopathy underwent visual acuity testing, slit-lamp biomicroscopy, and dilated fundus examination...
March 22, 2017: Retinal Cases & Brief Reports
https://www.readbyqxmd.com/read/28322910/long-term-stability-of-diurnal-salivary-cortisol-and-alpha-amylase-secretion-patterns
#6
Nadine Skoluda, Roberto La Marca, Mario Gollwitzer, Andreas Müller, Heribert Limm, Birgitt Marten-Mittag, Harald Gündel, Peter Angerer, Urs M Nater
This study aimed to investigate long-term stability and variability of diurnal cortisol and alpha-amylase patterns. Diurnal cortisol and alpha-amylase secretion patterns were assessed on a single workday with three waves of measurement across a total time period of 24months in 189 participants. Separate hierarchical linear models were analyzed, with and without a number of potential predictor variables (age, BMI, smoking, chronic stress, stress reactivity). While low long-term stability was found in diurnal cortisol, the stability of diurnal alpha-amylase was moderate across the time period of 24months...
March 18, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28322083/diurnal-variation-of-the-melanin-concentrating-hormone-level-in-the-hypothalamus
#7
Balázs Gerics, Ferenc Szalay, Péter Sótonyi, Veronika Jancsik
Melanin-concentrating hormone (MCH), the neuropeptide produced mainly in the hypothalamus, plays an operative role in regulating food intake and the sleep/wake cycle. Considering that these physiological functions pursue diurnal variations, we checked whether the total hypothalamic MCH level depends on the time of the day. The aggregated MCH peptide content of the whole MCH neuron population was significantly higher at the end of the sleeping period (lights on), than at the end of the active period (lights off)...
March 2017: Acta Biologica Hungarica
https://www.readbyqxmd.com/read/28301813/sources-of-nitrogen-heterocyclic-pahs-n-hets-along-a-riverine-course
#8
Anne-Kathrin Siemers, Wolf-Ulrich Palm, Christina Faubel, Jan Sebastian Mänz, Dieter Steffen, Wolfgang Ruck
For the first time the occurrence of 26 nitrogen heterocyclic polyaromatic hydrocarbons (N-HETs) and the antiepileptic drug carbamazepine (CBZ) as a marker for anthropogenic influence was determined in an entire river system and its influents. Besides the investigation of diurnal and annual variations in concentrations, dilution and load calculations, the aims were to facilitate transferability to other rivers by identifying sources of the different substances. To create a sufficient database over 180 aqueous samples from the River Fuhse (Lower Saxony, Germany), its catchment area, effluents of municipal and industrial wastewater treatment plants (WWTPs) and rainwater were analyzed...
March 13, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28285436/airborne-particulate-in-varanasi-over-middle-indo-gangetic-plain-variation-in-particulate-types-and-meteorological-influences
#9
Vishnu Murari, Manish Kumar, Alaa Mhawish, S C Barman, Tirthankar Banerjee
The variation in particulate mass and particulate types (PM2.5 and PM10) with respect to local/regional meteorology was analyzed from January to December 2014 (n = 104) for an urban location over the middle Indo-Gangetic Plain (IGP). Both coarser (mean ± SD; PM10 161.3 ± 110.4 μg m(-3), n = 104) and finer particulates (PM2.5 81.78 ± 66.4 μg m(-3)) revealed enormous mass loading with distinct seasonal effects (range: PM10 12-535 μg m(-3); PM2.5 8-362 μg m(-3)). Further, 56% (for PM2.5) to 81% (for PM10) of monitoring events revealed non-attainment national air quality standard especially during winter months...
April 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28284640/exposure-to-organophosphorus-pesticides-in-norwegian-mothers-and-their-children-diurnal-variability-in-concentrations-of-their-biomarkers-and-associations-with-food-consumption
#10
Enrique Cequier, Amrit Kaur Sakhi, Line Småstuen Haug, Cathrine Thomsen
Several studies have suggested that exposure to organophosphorus (OP) pesticides is detrimental for health, and in particular for children where moderate doses may have a negative impact on the neurodevelopment. This study surveys levels of the 6 non-specific urinary metabolites (dialkyl phosphates (DAPs)) of OP pesticides in Norwegian mothers (n=48) and their children (n=54), and examines the diurnal variation in concentrations as well as associations with consumption of specific food products. The highest median concentration measured in urine was found for dimethyl thiophosphate (5...
March 8, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28284133/monitoring-and-source-apportionment-of-trace-elements-in-pm2-5-implications-for-local-air-quality-management
#11
Yueyan Li, Miao Chang, Shanshan Ding, Shiwen Wang, Dun Ni, Hongtao Hu
Fine particulate matter (PM2.5) samples were collected simultaneously every hour in Beijing between April 2014 and April 2015 at five sites. Thirteen trace elements (TEs) in PM2.5 were analyzed by online X-ray fluorescence (XRF). The annual average PM2.5 concentrations ranged from 76.8 to 102.7 μg m(-3). TEs accounted for 5.9%-8.7% of the total PM2.5 mass with Cl, S, K, and Si as the most dominant elements. Spearman correlation coefficients of PM2.5 or TE concentrations between the background site and other sites showed that PM2...
March 8, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28280936/thermoregulation-of-the-bovine-scrotum-1-measurements-of-free-range-animals-in-a-paddock-and-pen
#12
Andrea L Wallage, S D Johnston, A T Lisle, L Beard, A M Lees, C W Collins, J B Gaughan
The bull's scrotum and scrotal cord vasculature has traditionally been regarded as a thermoregulatory device for maintaining optimal testicular temperature for normal spermatogenesis. This assumption has mostly been derived from discrete measurements using thermocouples with limited data correlating continuous scrotal temperature (ST) to body temperature (BT). From mid-summer to early autumn, four Wagyu bulls (9-18 months) were surgically implanted with two data loggers (DL) logging at 30 min intervals: one on the right hand side flank and the other was attached to the visceral vaginal tunic of the mid-testis...
March 9, 2017: International Journal of Biometeorology
https://www.readbyqxmd.com/read/28278029/overview-of-surface-measurements-and-spatial-characterization-of-submicron-particulate-matter-during-the-discover-aq-2013-campaign-in-houston
#13
Y J Leong, N P Sanchez, H W Wallace, B Karakurt Cevik, C S Hernandez, Y Han, J H Flynn, P Massoli, C Floerchinger, E C Fortner, S Herndon, J K Bean, L Hildebrandt Ruiz, W Jeon, Y Choi, B Lefer, R J Griffin
The sources of submicron particulate matter (PM1) remain poorly characterized in the industrialized city of Houston. A mobile sampling approach was used to characterize PM1 composition and concentration across Houston based on high time resolution measurements of non-refractory PM1 and trace gases during the DISCOVER-AQ Texas 2013 campaign. Two pollution zones with marked differences in PM1 levels, character, and dynamics were established based on cluster analysis of organic aerosol mass loadings sampled at sixteen sites...
February 28, 2017: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/28275167/novel-opsin-gene-variation-in-large-bodied-diurnal-lemurs
#14
Rachel L Jacobs, Tammie S MacFie, Amanda N Spriggs, Andrea L Baden, Toni Lyn Morelli, Mitchell T Irwin, Richard R Lawler, Jennifer Pastorini, Mireya Mayor, Runhua Lei, Ryan Culligan, Melissa T R Hawkins, Peter M Kappeler, Patricia C Wright, Edward E Louis, Nicholas I Mundy, Brenda J Bradley
Some primate populations include both trichromatic and dichromatic (red-green colour blind) individuals due to allelic variation at the X-linked opsin locus. This polymorphic trichromacy is well described in day-active New World monkeys. Less is known about colour vision in Malagasy lemurs, but, unlike New World monkeys, only some day-active lemurs are polymorphic, while others are dichromatic. The evolutionary pressures underlying these differences in lemurs are unknown, but aspects of species ecology, including variation in activity pattern, are hypothesized to play a role...
March 2017: Biology Letters
https://www.readbyqxmd.com/read/28265345/exercise-induced-albuminuria-vs-circadian-variations-in-blood-pressure-in-type-1-diabetes
#15
Isabelle Hota Tadida Meli, Aurel T Tankeu, Mesmin Y Dehayem, David Chelo, Jean Jacques N Noubiap, Eugene Sobngwi
AIM: To investigated the relationship between exercise-induced ambulatory blood pressure measurement (ABPM) abnormalities in type 1 diabetes mellitus (T1DM) adolescents. METHODS: We conducted a case-control at the National Obesity Center of the Yaoundé Central Hospital, Cameroon. We compared 24 h ABPM and urinary albumin-to-creatinine ratio (ACR) at rest and after a standardized treadmill exercise between 20 Cameroonian T1DM patients and 20 matched controls. T1DM adolescents were aged 12-18 years, with diabetes for at least one year, without proteinuria, with normal office blood pressure (BP) and renal function according to the general reference population...
February 15, 2017: World Journal of Diabetes
https://www.readbyqxmd.com/read/28265025/complex-terrain-experiments-in-the-new-european-wind-atlas
#16
J Mann, N Angelou, J Arnqvist, D Callies, E Cantero, R Chávez Arroyo, M Courtney, J Cuxart, E Dellwik, J Gottschall, S Ivanell, P Kühn, G Lea, J C Matos, J M L M Palma, L Pauscher, A Peña, J Sanz Rodrigo, S Söderberg, N Vasiljevic, C Veiga Rodrigues
The New European Wind Atlas project will create a freely accessible wind atlas covering Europe and Turkey, develop the model chain to create the atlas and perform a series of experiments on flow in many different kinds of complex terrain to validate the models. This paper describes the experiments of which some are nearly completed while others are in the planning stage. All experiments focus on the flow properties that are relevant for wind turbines, so the main focus is the mean flow and the turbulence at heights between 40 and 300 m...
April 13, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28261454/howler-monkey-foraging-ecology-suggests-convergent-evolution-of-routine-trichromacy-as-an-adaptation-for-folivory
#17
Amanda D Melin, Vishal Khetpal, Yuka Matsushita, Kaile Zhou, Fernando A Campos, Barbara Welker, Shoji Kawamura
Primates possess remarkably variable color vision, and the ecological and social factors shaping this variation remain heavily debated. Here, we test whether central tenants of the folivory hypothesis of routine trichromacy hold for the foraging ecology of howler monkeys. Howler monkeys (genus Alouatta) and paleotropical primates (Parvorder: Catarrhini) have independently acquired routine trichromacy through fixation of distinct mid- to long-wavelength-sensitive (M/LWS) opsin genes on the X-chromosome. The presence of routine trichromacy in howlers, while other diurnal neotropical monkeys (Platyrrhini) possess polymorphic trichromacy, is poorly understood...
March 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28261043/the-role-of-circadian-rhythms-in-muscular-and-osseous-physiology-and-their-regulation-by-nutrition-and-exercise
#18
REVIEW
Shinya Aoyama, Shigenobu Shibata
The mammalian circadian clock regulates the day and night cycles of various physiological functions. The circadian clock system consists of a central clock in the suprachiasmatic nucleus (SCN) of the hypothalamus and peripheral clocks in peripheral tissues. According to the results of circadian transcriptomic studies in several tissues, the majority of rhythmic genes are expressed in a tissue-specific manner and are influenced by tissue-specific circadian rhythms. Here we review the diurnal variations of musculoskeletal functions and discuss the impact of the circadian clock on homeostasis in skeletal muscle and bone...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28257553/activity-patterns-in-seven-captive-lemur-species-evidence-of-cathemerality-in-varecia-and-lemur-catta
#19
Joel Bray, David R Samson, Charles L Nunn
Cathemerality, or activity throughout the 24-hr cycle, is rare in primates yet relatively common among lemurs. However, the diverse ecological conditions under which cathemerality is expressed complicates attempts to identify species-typical behavior. For example, Lemur catta and Varecia have historically been described as diurnal, yet recent studies suggest that they might exhibit cathemeral behavior under some conditions. To investigate this variation, we monitored activity patterns among lemurs that are exposed to similar captive environments...
March 3, 2017: American Journal of Primatology
https://www.readbyqxmd.com/read/28251532/occurrence-and-distribution-of-antibiotics-in-multiple-environmental-media-of-the-east-river-dongjiang-catchment-south-china
#20
Ruijie Zhang, Ruiling Zhang, Jun Li, Zhineng Cheng, Chunling Luo, Yinghui Wang, Kefu Yu, Gan Zhang
The occurrence and distribution of 11 antibiotics in multiple environmental media including river water, suspended particle, sediment, and soil of the East River catchment, South China, were systematically characterized from multiple spatial (area and point) and temporal (seasonal variation and diurnal variation) scales. The results indicated that six to eight antibiotics were detected in these media. The predominant antibiotics and their concentrations varied with environment media because of the varied contamination sources, physicochemical properties of antibiotics, and media...
March 1, 2017: Environmental Science and Pollution Research International
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