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Journals Comparative Biochemistry and P...

Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology

https://read.qxmd.com/read/38462029/hydration-state-does-not-affect-selected-body-temperature-during-gravidity-or-gravidity-duration-in-pythons-antaresia-childreni
#1
JOURNAL ARTICLE
Jill L Azzolini, Dale F DeNardo, Stephen C Pratt
The embryonic development of many ectothermic species are highly sensitive to temperature and typically have a higher thermal optima than do most other physiological processes. Thus, female ectotherms often maintain a higher and more carefully controlled body temperature when she is supporting developing embryos (early development in oviparous species, throughout development in viviparous species). Considering the positive correlation between body temperature and evaporative water loss, this response could potentially exacerbate female water imbalance in water-limited environments, suggesting that female water balance and egg development may be in conflict...
March 8, 2024: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://read.qxmd.com/read/38458419/effects-of-dietary-calcium-ca-2-and-blood-feeding-on-the-immunochemical-expression-of-the-plasma-membrane-ca-2-atpase-pmca-in-malpighian-tubules-of-adult-female-mosquitoes-aedes-aegypti
#2
JOURNAL ARTICLE
Yuan Li, Peter M Piermarini
Insect Malpighian tubules contribute to Ca2+ homeostasis via Ca2+ storage in intracellular compartments, Ca2+ secretion into the tubule lumen, and Ca2+ reabsorption into the hemolymph. A plasma membrane Ca2+ -ATPase (PMCA) is hypothesized to be a Ca2+ -transporter involved in renal Ca2+ transport of insects, however few studies have investigated its immunochemical expression in Malpighian tubules. Here we characterized the abundance and localization of PMCA-like immunoreactivity in Malpighian tubules of adult female mosquitoes Aedes aegypti using an antibody against Drosophila melanogaster PMCA...
March 6, 2024: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://read.qxmd.com/read/38452971/lipids-in-the-american-alligator-stratum-corneum-provide-insights-into-the-evolution-of-vertebrate-skin
#3
JOURNAL ARTICLE
Elissa A Tam, Frank E Robb, Alex M Champagne
In terrestrial vertebrates, the outermost layer of the skin, the stratum corneum (SC), provides a durable and flexible interface with the environment and is comprised of corneocytes embedded in lipids. However, the morphology and lipid composition of the SC varies throughout evolutionary history. Because crocodilians and birds phylogenetically bracket the Archosaurian clade, lipid composition in crocodilian SC may be compared with that of birds and other vertebrates to make inferences about broader phylogenetic patterns within Archosaurs while highlighting adaptations in vertebrate skin...
March 5, 2024: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://read.qxmd.com/read/38452970/thermal-tolerance-of-a-freshwater-amphipod-gammarus-lacustris-can-be-enhanced-by-acclimation-to-higher-mineralization
#4
JOURNAL ARTICLE
Elizaveta Kondrateva, Kseniya Vereshchagina, Andrei Mutin, Maxim Timofeyev
Temperature and mineralization are among the most important environmental factors affecting all processes of aquatic ecosystems, including geographical distribution of water animals. Previously we showed that a brackish water population of Gammarus lacustris, a widespread amphipod, demonstrates substantially higher thermotolerance than a freshwater population. A possible reason for this difference is the fact that brackish water conditions are closer to internal media mineralization. Here we aimed to test this hypothesis and relate the observed effects in animal survival under the heat shock to the status of cellular defence systems...
March 5, 2024: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://read.qxmd.com/read/38452969/the-effect-of-size-and-density-on-the-mean-retention-time-of-particles-in-reindeer-rangifer-tarandus
#5
JOURNAL ARTICLE
Martina Singer, Daryl Codron, Isabel Lechner, Rebecca Rudnik, Perry Barboza, Jürgen Hummel, Marcus Clauss
Particle passage from the reticulorumen (RR) depends on particle density and size. A classic way of assessing these effects is the use of plastic markers of varying density and size that are recovered in the faeces. Here, we report results of an experiment where four fistulated reindeer (Rangifer tarandus, 96 ± 12 kg) were fed two different diets (browse, voluntary dry matter intake [DMI] 70 ± 10 g/kg0.75 /d; or a pelleted diet, DMI 124 ± 52 g/kg0...
March 5, 2024: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://read.qxmd.com/read/38438092/the-role-of-the-antennal-glands-and-gills-in-acid-base-regulation-and-ammonia-excretion-of-a-marine-osmoconforming-brachyuran
#6
JOURNAL ARTICLE
Garett Joseph Patrick Allen, Alex R Quijada-Rodriguez, Jonathan M Wilson, Dirk Weihrauch
The excretory mechanisms of stenohaline marine osmoconforming crabs are often compared to those of the more extensively characterized euryhaline osmoregulating crabs. These comparisons may have limitations, given that unlike euryhaline brachyurans the gills of stenohaline marine osmoconformers possess ion-leaky paracellular pathways and lack the capacity to undergo ultrastructural changes that can promote ion-transport processes in dilute media. Furthermore, the antennal glands of stenohaline marine osmoconformers are poorly characterized making it difficult to determine what role urinary processes play in excretion...
March 2, 2024: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://read.qxmd.com/read/38432457/long-term-fasting-induced-basal-thermogenesis-flexibility-in-female-japanese-quails
#7
JOURNAL ARTICLE
Jie-Heng Xu, Xin-Yu Xu, Xing-Yu Huang, Ke-Xin Chen, He Wen, Ming Li, Jin-Song Liu
Male Japanese quails (Coturnix japonica) have been found to exhibit a three-phase metabolic change when subjected to prolonged fasting, during which basal thermogenesis is significantly reduced. A study had shown that there is a significant difference in the body temperature between male and female Japanese quails. However, whether female Japanese quails also show the same characteristic three-phase metabolic change during prolonged fasting and the underlying thermogenesis mechanisms associated with such changes are still unclear...
March 1, 2024: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://read.qxmd.com/read/38408517/nadk-mediated-proline-synthesis-enhances-high-salinity-tolerance-in-the-razor-clam
#8
JOURNAL ARTICLE
Ruiqi Liu, Min Deng, Na Zhang, Yifeng Li, Liang Jia, Donghong Niu
Euryhaline organisms can accumulate organic osmolytes to maintain osmotic balance between their internal and external environments. Proline is a pivotal organic small molecule and plays an important role in osmoregulation that enables marine shellfish to tolerate high-salinity conditions. During high-salinity challenge, NAD kinase (NADK) is involved in de novo synthesis of NADP(H) in living organisms, which serves as a reducing agent for the biosynthetic reactions. However, the role of shellfish NADK in proline biosynthesis remains elusive...
February 24, 2024: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://read.qxmd.com/read/38401763/intraperitoneal-administration-of-kisspeptin-10-modulates-follicle-maturation-gonadal-steroids-calcium-and-metabolites-in-sterlet-sturgeon-acipenser-ruthenus
#9
JOURNAL ARTICLE
Zahra Roosta, Suraj Unniappan, Chinelo Uju, Mehdi Rahmati, Bahram Falahatkar
Kisspeptin is a multifunctional neurohormone, primarily involved in the regulation of reproduction. We tested whether peripheral administration of kisspeptin10 (KP-10) via intraperitoneal injection or slow release affects reproductive hormones and metabolites in Sterlet sturgeon (Acipenser ruthenus). Plasma and mucus 17β-estradiol (E2 ), and testosterone (T), plasma and follicular vitellogenin (VTG) and calcium (Ca) as well as glucose and lipids were determined. Mature Sterlet sturgeon were grouped into six treatment groups: saline i...
February 22, 2024: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://read.qxmd.com/read/38373589/the-pancreas-does-not-contribute-to-the-non-adrenergic-non-cholinergic-stimulation-of-heart-rate-in-digesting-pythons
#10
JOURNAL ARTICLE
Igor Noll Guagnoni, Katja B Last, Emil Rindom, Tobias Wang
Vertebrates elevate heart rate when metabolism increases during digestion. Part of this tachycardia is due to a non-adrenergic-non-cholinergic (NANC) stimulation of the cardiac pacemaker, and it has been suggested these NANC factors are circulating hormones that are released from either gastrointestinal or endocrine glands. The NANC stimulation is particularly pronounced in species with large metabolic responses to digestion, such as reptiles. To investigate the possibility that the pancreas may release hormones that exert positive chronotropic effects on the digesting Burmese python heart, a species with very large postprandial changes in heart rate and oxygen uptake, we evaluate how pancreatectomy affects postprandial heart rate before and after autonomic blockade of the muscarinic and the beta-adrenergic receptors...
February 17, 2024: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://read.qxmd.com/read/38360203/species-specific-oxylipins-and-the-effects-of-ontogeny-and-predation-on-their-emission-from-freshwater-snails
#11
JOURNAL ARTICLE
Olwyn C Friesen, Harold M Aukema, Jillian T Detwiler
Chemical cues play important roles in mediating ecological interactions. Oxylipins, oxygenated metabolites of fatty acids, are one signalling molecule type that influences the physiology and function of species, suggesting their broader significance in chemical communication within aquatic systems. Yet, our current understanding of their function is restricted taxonomically and contextually making it difficult to infer their ecological significance. Snails and leeches are ubiquitous in freshwater ecosystems worldwide, yet little is known about their oxylipin profiles and the factors that cause their profiles to change...
February 13, 2024: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://read.qxmd.com/read/38354902/immune-and-endocrine-alterations-at-the-early-stage-of-inflammatory-assemblage-in-toads-after-stimulation-with-heat-killed-bacteria-aeromonas-hydrophila
#12
JOURNAL ARTICLE
Patrício G Garcia Neto, Stefanny C M Titon, Sandra M Muxel, Braz Titon, Aymam C de Figueiredo, Felipe R Floreste, Alan S Lima, Vania R Assis, Fernando R Gomes
The red-leg syndrome in amphibians is a condition commonly associated with the bacteria Aeromonas hydrophila and has led to population declines. However, there is little information concerning the inflammatory assemblage in infected anurans. We evaluated immune and endocrine alterations induced by stimulation with heat-killed A. hydrophila injected in Rhinella diptycha toads. Control animals were not manipulated, while the others were separated into groups that received intraperitoneal injection of 300 μl of saline or heat-killed bacteria: groups A1 (3 × 107 cells), A2 (3 × 108 cells), and A3 (3 × 109 cells)...
February 12, 2024: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://read.qxmd.com/read/38346534/short-term-exposure-to-high-pco-2-leads-to-decreased-branchial-cytochrome-c-oxidase-activity-in-the-presence-of-octopamine-in-a-decapod
#13
JOURNAL ARTICLE
Sandra Fehsenfeld, Gwangseok R Yoon, Alex R Quijada-Rodriguez, Haluka Kandachi-Toujas, Piero Calosi, Sophie Breton, Dirk Weihrauch
In a recent mechanistic study, octopamine was shown to promote proton transport over the branchial epithelium in green crabs, Carcinus maenas. Here, we follow up on this finding by investigating the involvement of octopamine in an environmental and physiological context that challenges acid-base homeostasis, the response to short-term high pCO2 exposure (400 Pa) in a brackish water environment. We show that hyperregulating green crabs experienced a respiratory acidosis as early as 6 h of exposure to hypercapnia, with a rise in hemolymph pCO2 accompanied by a simultaneous drop of hemolymph pH...
February 10, 2024: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://read.qxmd.com/read/38330516/erratum-to-temperature-and-hypoxia-trigger-developmental-phenotypic-plasticity-of-cardiorespiratory-physiology-and-growth-in-the-parthenogenetic-marbled-crayfish-procambarus-virginalis-lyko-2017-comparative-biochemistry-and-physiology-part-a-288-2024-111562
#14
Torben Göpel, Warren W Burggren
No abstract text is available yet for this article.
February 7, 2024: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://read.qxmd.com/read/38316170/sensitivity-of-different-organs-and-tissues-as-biomarkers-of-oxidative-stress-in-juvenile-tambaqui-colossoma-macropomum-submitted-to-fasting
#15
JOURNAL ARTICLE
Naiara Melo, Stefania Priscilla de Souza, Isaac Konig, Daniella Aparecida de Jesus Paula, Isabela Simas Ferreira, Ronald Kennedy Luz, Luis David Solis Murgas
The present study was conducted to evaluate the effects of fasting on responses of oxidative biomarkers and antioxidant defenses using different organs and tissues of Colossoma macropomum. The fish were divided into two groups: fed (control) and fasting (7 days). After 7 days, the fish were sampled for assessment of oxidative stress biomarkers (MDA-lipid peroxidation and PCO-protein carbonyl) and antioxidant defenses (SOD-superoxide dismutase; CAT-catalase; GPX-glutathione peroxidase; and GST-glutathione-S -transferase) in the liver, intestine, gills, muscle, brain, and plasma...
February 3, 2024: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://read.qxmd.com/read/38311294/acute-metformin-induces-hyperglycemia-in-healthy-adult-mourning-doves-zenaida-macroura-a-pilot-study
#16
JOURNAL ARTICLE
Anthony J Basile, Avin Kreisler, Ryan Hassen, Kavita Singh, Maggie Symes, Gale Larson, Milena Figueiredo de Sousa, Karen L Sweazea
Birds have the highest blood glucose among vertebrates. Several mechanisms may explain this including the lack of a functional insulin-responsive glucose transport protein, high glucagon concentrations, and reliance on lipid oxidation resulting in the production of gluconeogenic precursors. The hypothesis was that interruption of gluconeogenesis using the diabetes medication metformin would lower glucose concentrations in wild-caught birds. We captured two cohorts of adult mourning doves, Zenaida macroura, and acclimated them to captivity for two weeks...
February 2, 2024: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://read.qxmd.com/read/38307449/effects-of-different-salinity-reduction-intervals-on-osmoregulation-anti-oxidation-and-apoptosis-of-eriocheir-sinensis-megalopa
#17
JOURNAL ARTICLE
Mingjun Shen, Yue Wang, Yongkai Tang, Fei Zhu, Jianbin Jiang, Jianlou Zhou, Qing Li, Qingguo Meng, Zhiwei Zhang
Eriocheir sinensis megalopa has a special life history of migrating from seawater to freshwater. In order to investigate how the megalopa adapt themselves to the freshwater environment, we designed an experiment to reduce the salinity of water from 30 ppt to 0 at rates of 30 ppt, 15 ppt, 10 ppt, and 5 ppt per 24 h to evaluate the effects of different degrees of hyposaline stress on the osmotic regulation ability and antioxidant system of the megalopa. Experimental results related to osmotic pressure regulation show that the gill tissue of megalopa in the treatment group of 30 ppt/24 h rapid reduction of salinity was damaged, while in the treatment group of 5 ppt/24 h it was intact...
January 31, 2024: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://read.qxmd.com/read/38302008/developmental-energetics-in-the-oviparous-corn-snake-pantherophis-guttatus-confirms-a-conservative-evolutionary-pattern-in-snakes
#18
JOURNAL ARTICLE
Celeste R Gallardo, James R Stewart, Joseph R Bidwell
Eggs of oviparous reptiles are ideal models for studying evolutionary patterns of embryonic metabolism since they allow tracking of energy allocation during development. Analyzing oxygen consumption of whole eggs throughout development indicates three patterns among reptiles. Embryos initially grow and consume oxygen exponentially, but oxygen consumption slows, or drops before hatching in some species. Turtles, crocodilians, and most lizards follow curves with initial exponential increases followed by declines, whereas embryonic snakes that have been studied exhibit a consistently exponential pattern...
January 30, 2024: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://read.qxmd.com/read/38281705/superoxidase-dismutases-sods-in-the-european-eel-gene-characterization-expression-response-to-temperature-combined-with-hormonal-maturation-and-possible-migratory-implications
#19
JOURNAL ARTICLE
L Ferrão, M Blanes-García, L Pérez, J F Asturiano, M Morini
Superoxide dismutases (SODs) are antioxidant enzymes that protect cells from oxidation. Three SODs have been identified in mammals, but there is limited information in teleosts. This study investigates SODs in the European eel and their expression patterns during testis maturation. Phylogenetic and synteny analyses revealed SODs paralogs and their evolution in vertebrates. The eel possesses one SOD1 and two SOD2/3 (a and b), indicating SOD2 and SOD3 duplication in elopomorphs. SODs expression were then evaluated in various male and female tissues...
January 26, 2024: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://read.qxmd.com/read/38253199/impacts-of-temperature-and-turbidity-on-the-gill-physiology-of-darter-species
#20
JOURNAL ARTICLE
Britney L Firth, Paul M Craig, D Andrew R Drake, Michael Power
Fish gills are complex organs that have direct contact with the environment performing numerous functions, including gas exchange and ion regulation. Determining if gill morphometry can change under different environmental conditions to maintain and/or improve gas exchange and ion regulation is important for understanding if gill plasticity can improve survival with increasing environmental change. We assessed gill morphology (gas exchange and ion regulation metrics), hematocrit and gill Na+ /K+ ATPase activity of wild-captured blackside darter (Percina maculata), greenside darter (Etheostoma blennioides), and johnny darter (Etheostoma nigrum) at two temperatures (10 and 25 °C) and turbidity levels (8 and 94 NTU)...
January 20, 2024: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
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