journal
MENU ▼
Read by QxMD icon Read
search

Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology

journal
https://www.readbyqxmd.com/read/28025707/phenotypic-plasticity-in-the-common-garden-snail-big-guts-and-heavier-mucus-glands-compete-in-snails-faced-with-the-dual-challenge-of-poor-diet-and-coarse-substrate
#1
Adam J Munn, Marguerite Treloar
Phenotypic plasticity allows animals to manage environmental challenges. Studies aimed at quantifying plasticity often focus on one challenge, such as diet, and one organ system, such the gastrointestinal tract, but this approach may not adequately reflect how plasticity could buffer multiple challenges. Thus, we investigated the outcomes of a dual challenge experiment that fed land snails either a high-fibre (low quality) or a low-fibre (high quality) diet, and simultaneously exercised them daily over 1.2 m on either a smooth surface of polyvinyl chloride (PVC) or a rough sandpaper...
December 26, 2016: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/27987017/life-in-the-fat-lane-seasonal-regulation-of-insulin-sensitivity-food-intake-and-adipose-biology-in-brown-bears
#2
K S Rigano, J L Gehring, B D Evans Hutzenbiler, A V Chen, O L Nelson, C A Vella, C T Robbins, H T Jansen
Grizzly bears (Ursus arctos horribilis) have evolved remarkable metabolic adaptations including enormous fat accumulation during the active season followed by fasting during hibernation. However, these fluctuations in body mass do not cause the same harmful effects associated with obesity in humans. To better understand these seasonal transitions, we performed insulin and glucose tolerance tests in captive grizzly bears, characterized the annual profiles of circulating adipokines, and tested the anorectic effects of centrally administered leptin at different times of the year...
December 16, 2016: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/27921142/intra-population-variability-of-ocean-acidification-impacts-on-the-physiology-of-baltic-blue-mussels-mytilus-edulis-integrating-tissue-and-organism-response
#3
L S Stapp, J Thomsen, H Schade, C Bock, F Melzner, H O Pörtner, G Lannig
Increased maintenance costs at cellular, and consequently organism level, are thought to be involved in shaping the sensitivity of marine calcifiers to ocean acidification (OA). Yet, knowledge of the capacity of marine calcifiers to undergo metabolic adaptation is sparse. In Kiel Fjord, blue mussels thrive despite periodically high seawater PCO2, making this population interesting for studying metabolic adaptation under OA. Consequently, we conducted a multi-generation experiment and compared physiological responses of F1 mussels from 'tolerant' and 'sensitive' families exposed to OA for 1 year...
December 5, 2016: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/27915366/aging-has-the-opposite-effect-on-camp-and-cgmp-circadian-variations-in-rat-leydig-cells
#4
Aleksandar Z Baburski, Srdjan J Sokanovic, Silvana A Andric, Tatjana S Kostic
The Leydig cell physiology displays a circadian rhythm driven by a complex interaction of the reproductive axis hormones and circadian system. The final output of this regulatory process is circadian pattern of steroidogenic genes expression and testosterone production. Aging gradually decreases robustness of rhythmic testosterone secretion without change in pattern of LH secretion. Here, we analyzed effect of aging on circadian variation of cAMP and cGMP signaling in Leydig cells. Results showed opposite effect of aging on cAMP and cGMP daily variation...
December 3, 2016: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/27866230/differential-expression-and-emerging-functions-of-non-coding-rnas-in-cold-adaptation
#5
REVIEW
Jacques J Frigault, Mathieu D Morin, Pier Jr Morin
Several species undergo substantial physiological and biochemical changes to confront the harsh conditions associated with winter. Small mammalian hibernators and cold-hardy insects are examples of natural models of cold adaptation that have been amply explored. While the molecular picture associated with cold adaptation has started to become clearer in recent years, notably through the use of high-throughput experimental approaches, the underlying cold-associated functions attributed to several non-coding RNAs, including microRNAs (miRNAs) and long non-coding RNAs (lncRNAs), remain to be better characterized...
November 19, 2016: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/27830334/the-effect-of-body-mass-and-diet-composition-on-torpor-patterns-in-a-malagasy-primate-microcebus-murinus
#6
Sheena L Faherty, C Ryan Campbell, Susan A Hilbig, Anne D Yoder
One of the most obvious physiological changes accompanying seasonal heterothermy in mammals is a fattening stage preceding periods of resource scarcity. This phenomenon reflects the interplay of both diet and physiology. Though the accrual of fat stores is known to be essential for overwintering in some species, the influence of diet on the physiology of torpor is not fully understood. Results from captive studies in heterothermic rodents and marsupials have indicated that when autumn diets are enriched with polyunsaturated fatty acids (PUFAs), animals receiving these diets experience deeper and more frequent torpor bouts than their counterparts receiving a control diet...
November 9, 2016: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/27830333/hooded-seal-cystophora-cristata-pups-ingest-snow-and-seawater-during-their-post-weaning-fast
#7
Pauke C Schots, Marie E Bue, Erling S Nordøy
The purpose of this study was to evaluate the importance of exogenous water intake (snow/seawater) in hooded seal (Cystophora cristata) pups during their post-weaning fast. In this study, five hooded seal pups had ad lib access to snow and seawater for the first 12 and last 21 days of their post-weaning fast, respectively. Total body water and water flux were determined during both exposure periods by use of the tritiated water method. Blood samples were collected to monitor changes in hematocrit, plasma urea and plasma osmolality...
November 9, 2016: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/27812726/avian-thermoregulation-in-the-heat-efficient-evaporative-cooling-in-two-southern-african-nightjars
#8
Ryan S O'Connor, Blair O Wolf, R Mark Brigham, Andrew E McKechnie
Nightjars represent a model taxon for investigating physiological limits of heat tolerance because of their habit of roosting and nesting in sunlit sites during the heat of the day. We investigated the physiological responses of Rufous-cheeked nightjars (Caprimulgus rufigena) and Freckled nightjars (Caprimulgus tristigma) to high air temperatures (T a) by measuring body temperature (T b), resting metabolic rate (RMR) and total evaporative water loss (TEWL) at T a ranging from 10 to 56 °C. Both species became hyperthermic at T a > T b...
November 3, 2016: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/27803975/di-and-tripeptide-transport-in-vertebrates-the-contribution-of-teleost-fish-models
#9
REVIEW
Tiziano Verri, Amilcare Barca, Paola Pisani, Barbara Piccinni, Carlo Storelli, Alessandro Romano
Solute Carrier 15 (SLC15) family, alias H(+)-coupled oligopeptide cotransporter family, is a group of membrane transporters known for their role in the cellular uptake of di- and tripeptides (di/tripeptides) and peptide-like molecules. Of its members, SLC15A1 (PEPT1) chiefly mediates intestinal absorption of luminal di/tripeptides from dietary protein digestion, while SLC15A2 (PEPT2) mainly allows renal tubular reabsorption of di/tripeptides from ultrafiltration, SLC15A3 (PHT2) and SLC15A4 (PHT1) possibly interact with di/tripeptides and histidine in certain immune cells, and SLC15A5 has unknown function...
November 1, 2016: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/27803974/swimming-metabolic-rates-vary-by-sex-and-development-stage-but-not-by-species-in-three-species-of-australian-otariid-seals
#10
Monique A Ladds, David J Slip, Robert G Harcourt
Physiology may limit the ability for marine mammals to adapt to changing environments. Depth and duration of foraging dives are a function of total available oxygen stores, which theoretically increase as animals grow, and metabolic costs. To evaluate how physiology may influence the travelling costs for seals to foraging patches in the wild, we measured metabolic rates of a cross-section of New Zealand fur seals, Australian fur seals and Australian sea lions representing different foraging strategies, development stages, sexes and sizes...
November 1, 2016: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/27803973/thermal-implications-of-interactions-between-insulation-solar-reflectance-and-fur-structure-in-the-summer-coats-of-diverse-species-of-kangaroo
#11
Terence J Dawson, Shane K Maloney
Not all of the solar radiation that impinges on a mammalian coat is absorbed and converted into thermal energy at the coat surface. Some is reflected back to the environment, while another portion is reflected further into the coat where it is absorbed and manifested as heat at differing levels. Substantial insulation in a coat limits the thermal impact at the skin of solar radiation, irrespective where in the coat it is absorbed. In coats with low insulation, the zone where solar radiation is absorbed may govern the consequent heat load on the skin (HL-SR)...
November 1, 2016: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/27787665/metabolic-and-regulatory-responses-involved-in-cold-acclimation-in-atlantic-killifish-fundulus-heteroclitus
#12
Timothy M Healy, Dillon J Chung, Kyle G Crowther, Patricia M Schulte
Ectotherms often respond to prolonged cold exposure by increasing mitochondrial capacity via elevated mitochondrial volume density [V V(mit,f)]. In fish, higher V V(mit,f) is typically associated with increased expression of nuclear respiratory factor 1 (Nrf1), a transcription factor that induces expression of nuclear-encoded respiratory genes. To examine if nrf1 expression or the expression of other genes that regulate mitochondrial biogenesis contribute to changes in whole-organism metabolic rate during cold acclimation, we examined the time course of changes in the expression of these genes and in metabolic rate in Atlantic killifish, Fundulus heteroclitus...
October 27, 2016: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/27318666/natural-variations-of-cold-tolerance-and-temperature-acclimation-in-caenorhabditis-elegans
#13
Misaki Okahata, Akane Ohta, Hitomi Mizutani, Yohei Minakuchi, Atsushi Toyoda, Atsushi Kuhara
Temperature is critical for the survival and proliferation of animals, which must be adapted to cope with environmental temperature changes. In this study, we demonstrated natural variations in the phenotypes of temperature tolerance and temperature acclimation of the nematode Caenorhabditis elegans, and we decoded whole genome sequence of six natural variations, which enabled us to map responsible gene polymorphisms onto specific chromosomal regions. The C. elegans laboratory strain, N2, survives at 2 °C after cultivation at 15 °C but is unable to survive at 2 °C after cultivation at 20 or 25 °C...
December 2016: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/27263116/life-in-a-dark-biosphere-a-review-of-circadian-physiology-in-arrhythmic-environments
#14
REVIEW
Andrew David Beale, David Whitmore, Damian Moran
Most of the life with which humans interact is exposed to highly rhythmic and extremely predictable changes in illumination that occur with the daily events of sunrise and sunset. However, while the influence of the sun feels omnipotent to surface dwellers such as ourselves, life on earth is dominated, in terms of biomass, by organisms isolated from the direct effects of the sun. A limited understanding of what life is like away from the sun can be inferred from our knowledge of physiology and ecology in the light biosphere, but a full understanding can only be gained by studying animals from the dark biosphere, both in the laboratory and in their natural habitats...
December 2016: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/27744515/comparison-of-thermal-traits-of-polistes-dominula-and-polistes-gallicus-two-european-paper-wasps-with-strongly-differing-distribution-ranges
#15
Helmut Kovac, Helmut Käfer, Iacopo Petrocelli, Anton Stabentheiner
The two paper wasps, Polistes dominula and Polistes gallicus, are related species with strongly differing distribution ranges. We investigated thermal tolerance traits (critical thermal limits and metabolic response to temperature) to gain knowledge about physiological adaptations to their local climate conditions and to get evidence for the reasons of P. dominula's successful dispersion. Body and ambient temperature measurements at the nests revealed behavioural adaptations to microclimate. The species differed clearly in critical thermal minimum (P...
October 15, 2016: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/27744514/establishing-the-thermal-window-for-aerobic-scope-in-new-zealand-geoduck-clams-panopea-zelandica
#16
Dung V Le, Andrea C Alfaro, Norman L C Ragg, Zoë Hilton, Nick King
Geoduck clams (Panopea spp.) are the longest-lived and largest deep burrowing bivalve. Their unique morphology allows them to live buried in the sediment at depths of up to 1 m. The endemic New Zealand geoduck (Panopea zelandica Quoy and Gaimard, 1835) has recently been identified as a potential species for aquaculture. However, very little is known about the biology and physiology of this entirely subtidal geoduck species. Currently, the New Zealand geoduck fishery relies entirely upon wild harvests, but farms are expected to emerge as cultivation protocols are established...
October 15, 2016: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/27734149/torpor-and-basking-after-a-severe-wildfire-mammalian-survival-strategies-in-a-scorched-landscape
#17
Jaya K Matthews, Clare Stawski, Gerhard Körtner, Cassandra A Parker, Fritz Geiser
Wildfires can completely obliterate above-ground vegetation, yet some small terrestrial mammals survive during and after fires. As knowledge about the physiological and behavioural adaptations that are crucial for post-wildfire survival is scant, we investigated the thermal biology of a small insectivorous marsupial (Antechinus flavipes) after a severe forest fire. Some populations of antechinus survived the fire in situ probably by hiding deep in rocky crevices, the only fire-proof sites near where they were trapped...
October 12, 2016: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/27722773/expression-of-vegf-111-and-other-vegf-a-variants-in-the-rat-uterus-is-correlated-with-stage-of-pregnancy
#18
Camilla M Whittington, Kevin Danastas, Georges E Grau, Christopher R Murphy, Michael B Thompson
Vascular endothelial growth factor A is a major mediator of angiogenesis, a critically important process in vertebrate growth and development as well as pregnancy. Here we report for the first time the expression of a rare and unusually potent splice variant, VEGF 111 , in vivo in mammals. This variant has previously only been found in mammals in cultured human cells exposed to genotoxic agents. Our discovery of VEGF 111 in the uterus of both a eutherian (rat) and a marsupial (fat-tailed dunnart) suggests that the splice variant may be common to all mammals...
October 8, 2016: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/27695931/modulation-of-digestive-enzyme-activities-in-the-avian-digestive-tract-in-relation-to-diet-composition-and-quality
#19
Kevin D Kohl, M Eugenia Ciminari, Juan G Chediack, James O Leafloor, William H Karasov, Scott R McWilliams, Enrique Caviedes-Vidal
In nature, birds are faced with variable food sources that may differ in composition (protein vs. carbohydrates) and quality (highly digestible material vs. indigestible fiber). Studies in passerine birds and some commercial poultry demonstrate that the gastrointestinal tract can respond to varying diet composition and quality by changing morphology and/or activities of digestive enzymes. However, studies in additional avian species are warranted to understand generalities of these trends. We first fed juvenile mallards (Anas platyrhynchos), chickens (Gallus gallus), and quails (Coturnix coturnix) on either high-carbohydrate or high-protein diets...
October 1, 2016: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/27245066/post-wildfire-physiological-ecology-of-an-australian-microbat
#20
Anna C Doty, Clare Stawski, Brad S Law, Fritz Geiser
Historical patterns of wildfires are being altered as a result of changing climate and therefore are becoming an increasingly pressing global issue. How small mammals deal physiologically with changes in landscape and food availability due to fire remains largely unknown, although recent studies on small heterothermic terrestrial mammals have shown an increase in post-fire torpor use to reduce energy and foraging requirements. However, data on the behavioural and physiological responses of bats after fires are scarce, although potentially these volant species may differ from terrestrial mammals...
October 2016: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
journal
journal
28919
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"