Piri Keşif Aracı

1

Digesta retention patterns in geese (Anser anser) and turkeys (Meleagris gallopavo) and deduced function of avian caeca

Dergi Makalesi

Kaynak :

Science Direct

Dergi:

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı:

Elsevier

Yazar(lar) :

Samuel Frei , Sylvia Ortmann , Michael Kreuzer , Jean-Michel Hatt , Marcus Clauss

Yıl :

2017

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı Web Sitesi

Tam Metin

Özet Ek Bilgiler

Kaydet

Although it is well-known that retrograde transport of urine fills the caeca of birds with fluid and small particles, the function of avian caeca is still not fully understood. We measured mean retention times (MRT) of solute (cobalt-EDTA, Co), small particle (< 2 mm, chromium-mordanted fibre, Cr) and large particle (8 mm, cerium-marked fibre, Ce) markers in geese (Anser anser) and turkeys (Meleagris gallopavo) fed alfalfa pellets ad libitum. Intake did not differ between species. Turkeys had longer MRT for all markers (Co: 10.4 vs. 3.2 h; Cr 23.3 vs. 2.9 h; Ce 9.5 vs. 2.1 h), achieved a higher fibre digestibility, and had a higher calculated dry matter gut fill. Thus, geese and turkeys correspond to the typical dichotomy of good fliers vs. poor fliers/flightless species in avian herbivores. Because uric acid is fermented much faster by microbes than fibre, the ultimate cause of short-MRT digesta retention in avian caeca as in geese is possibly rather uric acid than fibre fermentation. The numerical differences between marker MRT in geese correspond to a colonic separation mechanism that delays the excretion of fluids more than small and again more than large particles. In contrast to geese, turkeys excreted solid and liquid (caecal) faeces. Liquid faeces contained less fibre and more crude protein than solid faeces and accounted for the excretion of 7, 25 and 34% of Ce, Co and Cr markers. Marker excretion patterns and MRT for liquid faeces (Co 15 vs. Cr 50 h) suggest that small particles did not simply move in parallel to fluids, but were retained selectively by being trapped in colonic digesta upon expulsion from caeca, with subsequent repeated retrograde transport into caeca with the next batch of urine. Given the absence of coprophagy in birds (in contrast to small mammalian herbivores), such a delay of small (microbial) particle escape from the caeca appears reasonable.

DOI : 10.1016/j.cbpa.2016.12.001

Anahtar Kelimeler : Colonic separation mechanism, Caecum, Digesta passage, Digestion, Intake, Gut capacity

ISSN: 1095-6433
Cilt: 204
Sayfa: 219-227

2

Characterization of the segmental transport mechanisms of DL-methionine hydroxy analogue along the intestinal tract of rainbow trout with an additional comparison to DL-methionine

Dergi Makalesi

Kaynak :

Science Direct

Dergi:

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı:

Elsevier

Yazar(lar) :

Van Pham Thi Ha To , Marina Subramaniam , Karthik Masagounder , Matthew E. Loewen

Yıl :

2020

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı Web Sitesi

Tam Metin

Özet Ek Bilgiler

Kaydet

The aim of this study was to identify the unknown transport mechanism of the extensively used monocarboxylate methionine feed supplement DL-methionine hydroxy analogue (DL-MHA) in rainbow trout intestine. Transport across the pyloric caeca (PC), midgut (MG), and hindgut (HG) regions were kinetically studied in Na+- and H+-dependent manners. Gene expression of monocarboxylate (MCTs) and sodium monocarboxylate transporters (SMCTs) were assessed. Results demonstrated that DL-MHA transport from 0.2‐20 mM was Na+-dependent and obeyed Michaelis-Menten kinetics with low affinity in PC & MG in apical/basal pH of 7.7/7.7. Changes in apical/basal pH (6.0/6.0, 6.0/7.7, and 7.7/8.7) had insignificant effects on kinetics. In contrast, HG flux kinetics were only obtained in pH 7.7/8.7 or in the presence of lactate with medium affinity. Additionally, DL-MHA transport from 0‐150 μM demonstrated the presence of a Na+-dependent high-affinity transporter in PC & MG. Conclusively, two distinct carrier-mediated DL-MHA transport mechanisms along the trout gut were found: 1) in PC & MG: apical transport was regulated by Na+-requiring systems that possibly contained low- and high-affinity transporters, and basolateral transport was primarily achieved through a H+-independent transporter; 2) in HG: uptake was apically mediated by a Na+-dependent transporter with medium affinity, and basolateral exit was largely controlled by an H+-dependent transporter. Finally, two major methionine feed supplements, DL-MHA and DL-methionine (DL-Met) were compared to understand the differences in their bioefficacy. Flux rates of DL-MHA were only about 42.2–66.0% in PC and MG compared to DL-Met, suggesting intestinal transport of DL-MHA was lower than DL-Met.

DOI : 10.1016/j.cbpa.2020.110776

Anahtar Kelimeler : Methionine hydroxy analogue, DL-methionine, Trout intestine, Radioisotope flux, Transport kinetics, Met methionine, methionine, AA amino acid, amino acid, MHA methionine hydroxy analogue, methionine hydroxy analogue, Jmax maximal flux rate, maximal flux rate, Km half-saturation constant, half-saturation constant, PC pyloric caeca, pyloric caeca, MG midgut, midgut, HG hindgut, hindgut, MCT monocarboxylate transporter, monocarboxylate transporter, SMCT sodium monocarboxylate transporter, sodium monocarboxylate transporter, SCFA short-chain fatty acid, short-chain fatty acid

ISSN: 1095-6433
Cilt: 249
Sayfa: 110776

3

Rhythmic contractions in chick amnio-yolk sac and snake amnion during embryogenesis

Dergi Makalesi

Kaynak :

Science Direct

Dergi:

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı:

Elsevier

Yazar(lar) :

Marina V. Nechaeva , Tigran M. Turpaev

Yıl :

2002

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı Web Sitesi

Tam Metin

Özet Ek Bilgiler

Kaydet

The rhythmic movements of fetal membranes in chick and reptile embryos were studied to explore the developmental role of the extra-embryonic motor activity. In the snakes Lamprophis fuliginosus and Elaphe radiata, rhythmic contractions of amnion inside the developing egg were recorded from the 11th incubation day until pre-hatching stages (ca. day 60–72). The duration of these contractions averaged 2.02±0.27 min. The frequency ranged from 2 to 6 per 10 min and averaged 4.61±0.57 per 10 min. A tendency of frequency to increase toward the end of embryogenesis was observed. Lowering the temperature from 28 to 20 °C significantly decreased the frequency of amnion contractions to 2.85±0.91 per 10 min. The isolated snake amnion retained its capacity for spontaneous contraction. Noradrenaline inhibited, acetylcholine stimulated and serotonin did not affect the rhythmic activity of the isolated snake amnion. Similar effects were found when these agents were applied into the snake amniotic cavity. In the chick, yolk sac rhythmic contractions were recorded from the fifth until the 12th incubation days. The duration of these contractions ranged from 15 to 60 s, their frequency averaged 11.8±3.18 per 10 min and depended on temperature. The low temperature threshold was approximately 30 °C. After surgical removal of the amnion and embryo, the yolk sac continued contracting inside the egg. The yolk sac rhythmic contractions likely participate in the space movement of the embryo inside the egg during embryogenesis.

DOI : 10.1016/s1095-6433(02)00024-7

Anahtar Kelimeler : Amnion, Chick, Development, Reptile, Rhythmic contractions, Yolk sac

ISSN: 1095-6433
Sayı: 4
Cilt: 131
Sayfa: 861-870

4

Effects of a kaolinite complementation on rat intestine during refeeding following prolonged fasting

Dergi Makalesi

Kaynak :

Science Direct

Dergi:

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı:

Elsevier

Yazar(lar) :

F. Reichardt , B. Chaumande , C. Habold , J. Robin , A. Ackermann , A. Boos , F. Angel , L. Sabatier , J. Lignot , N. Liewig

Yıl :

2008

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı Web Sitesi

Tam Metin

Ek Bilgiler

Kaydet

DOI : 10.1016/j.cbpa.2008.04.065

ISSN: 1095-6433
Sayı: 3
Cilt: 150
Sayfa: S62

5

Environmental pollutants and non-coding telomeric RNA levels in Chironomus riparius (Diptera)

Dergi Makalesi

Kaynak :

Science Direct

Dergi:

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı:

Elsevier

Yazar(lar) :

R. Planelló , J.L. Martínez-Guitarte , G. Morcillo

Yıl :

2010

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı Web Sitesi

Tam Metin

Ek Bilgiler

Kaydet

DOI : 10.1016/j.cbpa.2010.06.016

ISSN: 1095-6433
Cilt: 157
Sayfa: S6

6

Diet and habitat aridity affect osmoregulatory physiology: An intraspecific field study along environmental gradients in the Rufous-collared sparrow

Dergi Makalesi

Kaynak :

Science Direct

Dergi:

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı:

Elsevier

Yazar(lar) :

Pablo Sabat , Sandra Gonzalez-Vejares , Karin Maldonado

Yıl :

2009

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı Web Sitesi

Tam Metin

Özet Ek Bilgiler

Kaydet

The urine field osmolality in Zonotrichia capensis along a latitudinal gradient in rainfall and temperature in Chile was examined. We also investigated latitudinal variation in the renal traits that mediate how these birds cope with dehydration. We used the δ15N of this species' tissue to investigate whether the reliance on animals and seeds varied among birds and if it had any effect on excretion and renal traits. We found a significant latitudinal variation in urine osmolality, a variable that was correlated with habitat aridity. We also found that the kidney size and proportion of kidney devoted to medullary tissue differed between birds from arid and mesic localities, but not in a lineal fashion with aridity. The increment in the position in the food web, as measured by δ15N, led to an increment in urine osmolality, without changes in kidney features. Our data suggested that differences in dietary habits in the field could be not extended enough to cause changes in the kidney structure in Rufous-collared sparrows.

DOI : 10.1016/j.cbpa.2008.11.003

Anahtar Kelimeler : Aridity, Kidney, Osmoregulation, Urine, Passerines

ISSN: 1095-6433
Sayı: 3
Cilt: 152
Sayfa: 322-326

7

Feeding-induced morphological and thermal changes in the gut of juvenile Burmese pythons

Dergi Makalesi

Kaynak :

Science Direct

Dergi:

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı:

Elsevier

Yazar(lar) :

J. Lignot , R. Pope , N. Reix , M.T. Flachebba , S. Secor , C. Helmstetter

Yıl :

2007

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı Web Sitesi

Tam Metin

Ek Bilgiler

Kaydet

DOI : 10.1016/j.cbpa.2007.01.369

ISSN: 1095-6433
Sayı: 4
Cilt: 146
Sayfa: S174

8

Retinoid X receptor (RXR), estrogen receptor (ER) and other nuclear receptors in tissues of the mussel Mytilus galloprovincialis: Cloning and transcription pattern

Dergi Makalesi

Kaynak :

Science Direct

Dergi:

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı:

Elsevier

Yazar(lar) :

Damien Raingeard , Eider Bilbao , Ibon Cancio , Miren P. Cajaraville

Yıl :

2013

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı Web Sitesi

Tam Metin

Özet Ek Bilgiler

Kaydet

Bivalve molluscs accumulate chemical compounds from the environment that could cause alterations in lipid homeostasis and endocrine system. In vertebrates such cell processes are modulated by transcription factors belonging to the superfamily of nuclear receptors (NRs). The goal of this study was to clone fragments of mussel Mytilus galloprovincialis NR genes that could mediate cell responses such as peroxisome proliferation and endocrine disruption. PCR-based screening of mussel digestive gland cDNA using degenerate primers provided cDNA fragments or whole ORFs of retinoid X receptor (RXR), estrogen receptor (ER) and 5 proteins belonging to the NR1 subfamily highly similar to the arthropod ecdysone inducible protein E75. NR1G, whose whole ORF was cloned, is related to the nematode and trematode G group of NR1 receptors; NR1DEF is related to the D, E and F groups, and NR1Dv1, NR1Dv2 and NR1DΔ belong to the D group. mRNA transcripts for all these receptors were detected in gill, mantle and digestive gland. In all cases, except ER, transcript levels were lower in June than in January. NR1Dv1 and NR1DΔ did not show identical transcription levels, although both were at their lowest in digestive gland in June. On the contrary, NR1Dv2 and NR1DΔ transcription profiles were similar. Further studies are needed to determine the function(s) of mussel RXR, ER and novel NR1 subfamily receptors and their possible role in the regulation of physiological cell responses and/or adaptive response to xenobiotic exposures.

DOI : 10.1016/j.cbpa.2013.03.001

Anahtar Kelimeler : Mytilus galloprovincialis, Nuclear receptors, RXR, ER, E75, Gene transcription pattern, Tissue transcription, Season

ISSN: 1095-6433
Sayı: 2
Cilt: 165
Sayfa: 178-190

9

Elasmobranch models that have furthered our understanding of neural control of physiological function in vertebrates

Dergi Makalesi

Kaynak :

Science Direct

Dergi:

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı:

Elsevier

Yazar(lar) :

Edwin W. Taylor

Yıl :

2009

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı Web Sitesi

Tam Metin

Ek Bilgiler

Kaydet

DOI : 10.1016/j.cbpa.2009.04.016

ISSN: 1095-6433
Sayı: 2
Cilt: 153
Sayfa: S68

10

Ontogenetic development of respiratory control

Dergi Makalesi

Kaynak :

Science Direct

Dergi:

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı:

Elsevier

Yazar(lar) :

J.J. Greer

Yıl :

1999

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı Web Sitesi

Tam Metin

Ek Bilgiler

Kaydet

DOI : 10.1016/s1095-6433(99)90123-x

ISSN: 1095-6433
Cilt: 124
Sayfa: S31

11

Effects of prolonged food limitation on energy metabolism and burrowing activity of an infaunal marine bivalve, Mya arenaria

Dergi Makalesi

Kaynak :

Science Direct

Dergi:

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı:

Elsevier

Yazar(lar) :

Fouzia Haider , Stefan Timm , Torben Bruhns , Mirza Nusrat Noor , Inna M. Sokolova

Yıl :

2020

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı Web Sitesi

Tam Metin

Özet Ek Bilgiler

Kaydet

Benthic organisms are subject to prolonged seasonal food limitation in the temperate shallow coastal waters that can cause energetic stress and affect their performance. Sediment-dwelling marine bivalves cope with prolonged food limitation by adjusting different physiological processes that might cause trade-offs between maintenance and other fitness-related functions. We investigated the effects of prolonged (42 days) food deprivation on bioenergetics, burrowing performance and amino acid profiles in a common marine bivalve, Mya arenaria collected in winter and spring. Food limitation of >15 days decreased respiration of the clams by 80%. Total tissue energy content was higher in spring-collected clams (reflecting higher lipid content) than in their winter counterparts. Prolonged food deprivation decreased the tissue energy content of clams, especially in winter. The levels of free amino acids transiently increased during the early phase of food deprivation possibly reflecting suppression of the protein synthesis or enhanced protein degradation. The levels of amino acids considered essential for bivalves were more tightly conserved than those of non-essential amino acids during starvation. The burrowing capacity of clams was negatively affected by food deprivation so that the time required for a burial cycle increased by 35–50% after 22–42 days of starvation. During the early phase of starvation, clams preferentially used lipids as fuel for burrowing, whereas carbohydrates were used at the later phase. These findings suggest that although M. arenaria can withstand prolonged food deprivation by lowering their basal maintenance costs and switching their fuel usage, their ecological functions (e.g. bioturbation and the energy transferable to the next trophic level) could be negatively impacted by starvation.

DOI : 10.1016/j.cbpa.2020.110780

Anahtar Kelimeler : Bioturbation, Metabolism, Oxygen consumption, Amino acid pool, Starvation

ISSN: 1095-6433
Cilt: 250
Sayfa: 110780

12

Ionic effects on intrinsic gill muscles in the freshwater bivalve, Dreissena polymorpha

Dergi Makalesi

Kaynak :

Science Direct

Dergi:

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı:

Elsevier

Yazar(lar) :

Scott Medler , C.Cory Thompson , Thomas H. Dietz , Harold Silverman

Yıl :

1999

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı Web Sitesi

Tam Metin

Özet Ek Bilgiler

Kaydet

The intrinsic gill muscles in Dreissena polymorpha are arranged to affect interfilament distance and ostial dimension. This orientation suggests a role in the general control of gill function including the regulation of water flow. Muscle contraction in the gill results in a decrease in overall surface area and we used this change in dimension as an indirect measure of muscle contraction. The Ringer’s solution bathing the gill was experimentally manipulated to assess the effects of ionic composition on muscle activity elicited by acetylcholine application. Eliminating CaCl2 in the Ringer’s and adding 1 mM EGTA, or replacing the CaCl2 with CoCl2 or MnCl2 abolished the contractile response. A proper balance between NaCl and KCl was also critical for the maintenance of muscle response. The optimal KCl concentration was between 1 and 2 mM and became most important at higher NaCl concentrations. Acclimation to hyperosmotic conditions was dependent in part on the ouabain-sensitive activity of a Na+/K+ATPase. Overall, these muscles respond to their ionic environment as one might expect from typical molluscan smooth muscles. An alteration of muscle function experienced during changing environmental conditions may limit the distribution of this species.

DOI : 10.1016/s1095-6433(98)10161-7

Anahtar Kelimeler : Ions, Bivalve, Gill, Muscle, Zebra mussel, Acclimation, Environment, Freshwater

ISSN: 1095-6433
Sayı: 2
Cilt: 122
Sayfa: 163-172

13

The Disequilibrium pH: A Tool for the Localization of Carbonic Anhydrase

Dergi Makalesi

Kaynak :

Science Direct

Dergi:

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı:

Elsevier

Yazar(lar) :

Kathleen M Gilmour

Yıl :

1998

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı Web Sitesi

Tam Metin

Özet Ek Bilgiler

Kaydet

The disequilibrium pH is defined as any discrepancy between the measured pH and the pH which would exist if CO2-HCO3−-H+ reactions were at equilibrium. Measurement of the disequilibrium pH can be used to assess the status of CO2-HCO3−-H+ reactions and, in combination with carbonic anhydrase (CA) or CA inhibitor treatments, may also be used to localize CA. Renal physiologists have used disequilibrium experiments to determine that HCO3− reabsorption in the kidney tubule occurs via proton secretion, and that CA activity is available to ultrafiltrate CO2-HCO3−-H+ reactions in the proximal convoluted tubule, but not the distal tubule. Disequilibrium experiments were also used in investigating the availability of CA to CO2-HCO3−-H+ reactions in water at the fish gill; the opposing results obtained in two studies have not yet been resolved. Respiratory physiologists have used the disequilibrium technique in vivo and with saline-perfused preparations to assess the availability of CA to plasma CO2-HCO3−-H+ reactions following gas exchange. Saline-perfused preparations enable direct localization of CA activity, while in vivo measurements encompass the numerous factors affecting CO2-HCO3−-H+ equilibration in a multi-phase solution. Given the many organs in which membrane-bound CA activity has now been identified, the usefulness of the disequilibrium pH technique has increased beyond its original applications in renal and pulmonary physiology.

DOI : 10.1016/s1095-6433(97)00439-x

Anahtar Kelimeler : Stopflow technique, acid-base disequilibrium, blood, kidney tubule, ventilatory water, carbonic anhydrase, carbonic anhydrase inhibitors, pH

ISSN: 1095-6433
Sayı: 1
Cilt: 119
Sayfa: 243-254

14

The relationship between body size and the field potentials generated by swimming crayfish

Dergi Makalesi

Kaynak :

Science Direct

Dergi:

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı:

Elsevier

Yazar(lar) :

Blair W. Patullo , David L. Macmillan

Yıl :

2004

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı Web Sitesi

Tam Metin

Özet Ek Bilgiler

Kaydet

Aquatic animals generate electrical field potentials which may be monitored by predators or conspecifics. Many crustaceans use rapid, forceful contractions of the flexor and extensor muscles to curl and extend their abdomens during swimming in escape and locomotion. When crayfish swim they generate electrical field potentials that can be recorded by electrodes nearby in the water. In general, it is reasonable to assume that larger bodied crayfish will generate signals of greater amplitude because they have larger muscles. It is not known, however, how activity in particular muscles and nerves combines to produce the compound electrical waveform recorded during swimming. We therefore investigated the relationship between abdominal muscle, body size and the amplitude of nearby tailflip potentials in the freshwater crayfish (Cherax destructor). We found that amplitude was correlated positively with abdominal muscle mass. The mean amplitude recorded from the five smallest and five largest individuals differed by 440 μV, a difference sufficiently large to be of significance to predators and co-inhabitants in the wild.

DOI : 10.1016/j.cbpb.2004.07.009

Anahtar Kelimeler : Crustacea, Crayfish, Tailflip, Field potential, Muscle, Prey, Abdomen, Body size

ISSN: 1095-6433
Sayı: 1
Cilt: 139
Sayfa: 77-81

15

Molecular responses of fishes to elevated carbon dioxide

Dergi Makalesi

Kaynak :

Science Direct

Dergi:

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı:

Elsevier

Yazar(lar) :

Clark E. Dennis , Daniel F. Kates , Matthew R. Noatch , Cory D. Suski

Yıl :

2015

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı Web Sitesi

Tam Metin

Özet Ek Bilgiler

Kaydet

Hypercarbia, or elevated carbon dioxide, is an environmental challenge that can have detrimental effects on the physiology and performance of aquatic organisms. With aquatic hypercarbia predicted to become more prevalent in the future due to global climate change, it is important to quantify how hypercarbia impacts aquatic organisms, especially fish. The impact of hypercarbia on the behavior and physiology of fishes has been well studied, but relatively few studies have examined the molecular processes that underlie resulting behavioral and physiological changes. In an effort to define the molecular response of fishes to acute hypercarbia exposure, bluegill (Lepomis macrochirus) and silver carp (Hypophthalmichthys molitrix) were exposed to either 30 mg L− 1 CO2 (pCO2 ≈ 15,700 μatm) or ambient (10 mg L− 1 CO2; pCO2 ≈ 920 μatm) conditions for 1 h and the expression of a variety of genes, across three tissues, were compared. Exposure to 30 mg L− 1 CO2 in bluegill and silver carp resulted in an increase in c-fos, hif1-α, and gr-2 transcripts, while silver carp alone showed increases in hsp70 and hsc70-2 mRNA. This study demonstrates that acute hypercarbia exposure impacts gene expression in a species and tissue specific manner, which can be useful in identifying potential mechanisms for hypercarbia tolerance between species, and pinpoint specific tissues that are sensitive to hypercarbia exposure.

DOI : 10.1016/j.cbpa.2014.05.013

Anahtar Kelimeler : Hypercarbia, Stress, Fish, Genes, Tolerance, Erythrocytes, Gill

ISSN: 1095-6433
Cilt: 187
Sayfa: 224-231

16

Index

Dergi Makalesi

Kaynak :

Science Direct

Dergi:

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı:

Elsevier

Yıl :

1999

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı Web Sitesi

Tam Metin

Ek Bilgiler

Kaydet

DOI : 10.1016/s1095-6433(99)00064-1

ISSN: 1095-6433
Sayı: 4
Cilt: 122
Sayfa: VIII

17

Passive unsteady aerodynamic force of a swallowtail butterfly

Dergi Makalesi

Kaynak :

Science Direct

Dergi:

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı:

Elsevier

Yazar(lar) :

Hiroto Tanaka

Yıl :

2009

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı Web Sitesi

Tam Metin

Ek Bilgiler

Kaydet

DOI : 10.1016/j.cbpa.2009.04.194

ISSN: 1095-6433
Sayı: 2
Cilt: 153
Sayfa: S121

18

CBP Peter Hochachka Lecture: L6. BOLD ENOUGH TO BE WRONG IN SCIENCE

Dergi Makalesi

Kaynak :

Science Direct

Dergi:

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı:

Elsevier

Yazar(lar) :

James H. Jones

Yıl :

2007

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı Web Sitesi

Tam Metin

Ek Bilgiler

Kaydet

DOI : 10.1016/j.cbpa.2007.06.412

ISSN: 1095-6433
Cilt: 148
Sayfa: S3

19

Gametogenesis correlated with steroid levels during the gonadal cycle of the sea urchin Paracentrotus lividus (Echinodermata: Echinoidea)

Dergi Makalesi

Kaynak :

Science Direct

Dergi:

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı:

Elsevier

Yazar(lar) :

Alice Barbaglio , Michela Sugni , Cristiano Di Benedetto , Francesco Bonasoro , Sabine Schnell , Ramon Lavado , Cinta Porte , Daniela M. Candia Carnevali

Yıl :

2007

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı Web Sitesi

Tam Metin

Özet Ek Bilgiler

Kaydet

The specific mechanism regulating reproduction in invertebrates is a field of topical interest which needs to be explored in detail considering also the intriguing possible comparison with vertebrates. In this paper levels of Testosterone (T) and Estradiol (E2) and their reciprocal ratios were determined in ovaries and testis of the echinoid model species Paracentrotus lividus during the year 2004 by taking into account a putative relationship between steroid levels and reproductive cycle. T levels appeared to significantly vary during male reproductive cycle, thus suggesting a possible role of this hormone in regulation of spermatogenesis as demonstrated for other echinoderms. E2 levels were lower in males with respect to females; consequently E2 involvement in oogenesis is hypothesized. In parallel with steroid levels evaluation, variations in P450-aromatase activity and its possible role on regulation of gametogenesis were also considered. Clear correlations between steroid levels and gonad index (GI), as well as between GI and reproductive cycle were not detected, suggesting that GI alone is not a reliable parameter in describing the reproductive status of the gonads. Altogether the results obtained so far confirm the presence of a relationship between steroid levels and reproductive cycle as suggested by previous results on different echinoderm species.

DOI : 10.1016/j.cbpa.2007.01.682

Anahtar Kelimeler : Aromatase, Echinoids, Estradiol, Gonad index, Reproductive cycle, Testosterone

ISSN: 1095-6433
Sayı: 2
Cilt: 147
Sayfa: 466-474

20

Lamprey parasitism of sharks and teleosts: high capacity urea excretion in an extant vertebrate relic

Dergi Makalesi

Kaynak :

Science Direct

Dergi:

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı:

Elsevier

Yazar(lar) :

Michael P. Wilkie , Steven Turnbull , Jonathan Bird , Yuxiang S. Wang , Jaime F. Claude , John H. Youson

Yıl :

2004

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı Web Sitesi

Tam Metin

Özet Ek Bilgiler

Kaydet

We observed 10 sea lampreys (Petromyzon marinus) parasitizing basking sharks (Cetorhinus maximus), the world's second largest fish, in the Bay of Fundy. Due to the high concentrations of urea in the blood and tissues of ureosmotic elasmobranchs, we hypothesized that sea lampreys would have mechanisms to eliminate co-ingested urea while feeding on basking sharks. Post-removal urea excretion rates (JUrea) in two lampreys, removed from separate sharks by divers, were initially 450 (≈9000 μmol N kg−1 h−1) and 75 times (≈1500 μmol N kg−1 h−1) greater than basal (non-feeding) rates (≈20 μmol N kg−1 h−1). In contrast, JUrea increased by 15-fold after parasitic lampreys were removed from non-ureosmotic rainbow trout (Oncorhynchus mykiss). Since activities of the ornithine urea cycle (OUC) enzymes, carbamoyl phosphate synthetase III (CPSase III) and ornithine carbamoyl transferase (OCT) were relatively low in liver and below detection in intestine and muscle, it is unlikely that the excreted urea arose from de novo urea synthesis. Measurements of arginase activity suggested that hydrolysis of dietary arginine made a minor contribution to JUrea.. Post-feeding ammonia excretion rates (JAmm) were 15- to 25-fold greater than basal rates in lampreys removed from both basking sharks and rainbow trout, suggesting that parasitic lampreys have a high capacity to deaminate amino acids. We conclude that the sea lamprey's ability to penetrate the dermal denticle armor of sharks, to rapidly excrete large volumes of urea and a high capacity to deaminate amino acids, represent adaptations that have contributed to the evolutionary success of these phylogenetically ancient vertebrates.

DOI : 10.1016/j.cbpb.2004.06.001

Anahtar Kelimeler : Arginase, Ammonia, Basking shark, Carbamoyl phosphate synthetase, Facilitated urea transport, Ornithine urea cycle, Osmoregulation, Lamprey, Trimethylamine oxide, Uricolysis

ISSN: 1095-6433
Sayı: 4
Cilt: 138
Sayfa: 485-492

21

Tracing the origin of different red blood cell NKCC activation modes within birds

Dergi Makalesi

Kaynak :

Science Direct

Dergi:

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı:

Elsevier

Yazar(lar) :

Pia Koldkjær , Augusto S. Abe , Tobias Wang , Mads F. Bertelsen , Arjen Van't Hof

Yıl :

2009

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı Web Sitesi

Tam Metin

Ek Bilgiler

Kaydet

DOI : 10.1016/j.cbpa.2009.04.148

ISSN: 1095-6433
Sayı: 2
Cilt: 153
Sayfa: S107

22

Gizzard myoglobin contents and feeding habits in avian species

Dergi Makalesi

Kaynak :

Science Direct

Dergi:

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı:

Elsevier

Yazar(lar) :

Yasunori Enoki , Tomotoshi Morimoto

Yıl :

2000

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı Web Sitesi

Tam Metin

Özet Ek Bilgiler

Kaydet

In an attempt to consider physiological function of myoglobin (Mb), we determined Mb contents of gizzard smooth muscles with special reference to feeding habits in 85 avian species of 19 orders. The Mb content in 44 species of herbivorous birds was 7.52±3.81 mg/g wet muscle, which was significantly higher than the value of 2.34±1.74 mg/g in 41 species of carnivorous ones (P<0.001). Buffering capacity, as determined by in vitro titration method, was 37.3±5.5 slykes/g in gizzard smooth muscles of 75 species and 60.7±10.5 slykes in breast skeletal muscles of 77 species (P<0.001), which suggests a significantly higher dependence, almost comparable to cardiac muscles, of the gizzard muscular function on aerobic metabolism. Together with the fact that blood circulation in the gizzard is very low at resting, and might be further limited during activity, we conclude that the higher Mb content in gizzards of herbivorous birds is an adaptation, to allow storage and/or facilitated diffusion of oxygen, during process of high mechanical work required to grind down hard and fibrous vegetable food under the conditions of limited circulatory supply.

DOI : 10.1016/s1095-6433(99)00161-0

Anahtar Kelimeler : Birds, Buffering capacity, Capillarity, Circulation, Feeding habit, Gizzard, Myoglobin, Oxygen, Skeletal muscle, Smooth muscle

ISSN: 1095-6433
Sayı: 1
Cilt: 125
Sayfa: 33-43

23

Physiology of perfusion of the secondary circulatory system in fish

Dergi Makalesi

Kaynak :

Science Direct

Dergi:

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı:

Elsevier

Yazar(lar) :

J.F. Steffensen

Yıl :

1999

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı Web Sitesi

Tam Metin

Ek Bilgiler

Kaydet

DOI : 10.1016/s1095-6433(99)90156-3

ISSN: 1095-6433
Cilt: 124
Sayfa: S40

24

Inter- and intra-individual variation in resting oxygen consumption in post-larvae of the giant freshwater prawn, Macrobrachium rosenbergii (De Man)

Dergi Makalesi

Kaynak :

Science Direct

Dergi:

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı:

Elsevier

Yazar(lar) :

Alan Taylor , Ben Ross , Shona McCauley , Janet H Brown , Felicity Huntingford

Yıl :

2002

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı Web Sitesi

Tam Metin

Özet Ek Bilgiler

Kaydet

In a study of the factors that influence metabolic rate in the giant freshwater prawn Macrobrachium rosenbergii, resting oxygen consumption (ROC) was measured in 90 post-larvae ranging in size from 0.1 to 2.8 g. As in many other animal species, ROC was strongly negatively related to body weight. A stressful event (anaesthesia with or without tagging) caused a sharp increase in the ROC that disappeared over a time scale of hours. As has been demonstrated for other species of crustaceans, ROC was highest in prawns in the pre-moult stage. Individual differences in ROC among prawns handled in the same way and in the same moult stage persisted over a period of hours, but not over days. It remains unclear, therefore, whether early differences in resting metabolic rate can explain the conspicuous differences in growth rate that are found in this species during the first few weeks of life and that profoundly influence subsequent life history events.

DOI : 10.1016/s1095-6433(02)00087-9

Anahtar Kelimeler : Macrobrachium rosenbergii, Prawns, Oxygen consumption, Moulting, Marking, Individual variation

ISSN: 1095-6433
Sayı: 2
Cilt: 132
Sayfa: 459-466

25

Extracellular calcium-sensing receptors in fishes

Dergi Makalesi

Kaynak :

Science Direct

Dergi:

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı:

Elsevier

Yazar(lar) :

Christopher A. Loretz

Yıl :

2008

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı Web Sitesi

Tam Metin

Özet Ek Bilgiler

Kaydet

The extracellular calcium-sensing receptor (CaSR) in fishes, like the CaSRs of tetrapod vertebrates, is a dimeric seven transmembrane, G protein-coupled receptor. The receptor is expressed on the plasma membranes of a variety of tissues and cells where it functions as a sensor of extracellular calcium concentration ([Ca2+]o) in the physiological range. In the context of systemic calcium homeostasis, CaSR expressed in endocrine tissues that secrete calciotropic and other hormones (pituitary gland and corpuscles of Stannius) may play a central role in global integrative signaling, whereas receptor expressed in ion-transporting tissues (kidney, intestine, gills, and elasmobranch rectal gland) may have local direct effects on monovalent and divalent ion transport that are independent of endocrine signaling. In fishes, specifically, CaSR expression at the body surface (at the gills and olfactory tissues, for example) may permit direct sensing of environmental Ca2+ and Mg2+ concentrations, especially in the marine environment. Additionally, CaSRs may have other widespread and diverse roles in extracellular Ca2+ sensing related both to organismal calcium homeostasis and to intercellular Ca2+ signaling. As a consequence of the broad spectrum of recognized ligands, including polyvalent cations and amino acids, and of binding site shielding by monovalent cations, additional receptor functionalities related to salinity and nutrient detection are proposed for CaSRs. CaSR expression in the gastrointestinal tract may be multifunctional as a sensor for polyvalent cations and amino acids. Structural and phylogenetic analyses reveal strongly conserved features among CaSRs, and suggest that calcium sensing by mammalian parathyroid gland-type CaSR proteins may be restricted to chordates. Comparative functional and genomic studies that include piscine CaSRs can be useful model systems for testing existing hypotheses regarding receptor function, and will shed light on the evolutionary developmental history of calcium homeostasis in the vertebrates.

DOI : 10.1016/j.cbpa.2008.01.037

Anahtar Kelimeler : CaSR calcium-sensing receptor, calcium-sensing receptor, CAS plant calcium-sensing receptor, plant calcium-sensing receptor, EC50 effective concentration producing a 50%, effective concentration producing a 50%, response, ECD extracellular domain, extracellular domain, ERK extracellular signal-regulated kinase, extracellular signal-regulated kinase, FW freshwater-acclimated, freshwater-acclimated, GPCR, G protein-coupled receptor, GABAB-R type B γ-aminobutyric acid receptor, type B γ-aminobutyric acid receptor, HEK human embryonic kidney, human embryonic kidney, ICD intracellular domain, intracellular domain, InsP inositol phosphates, inositol phosphates, IP3 inositol trisphosphate, inositol trisphosphate, MAPK mitogen-activated protein kinase, mitogen-activated protein kinase, mGluR metabotropic glutamate receptor, metabotropic glutamate receptor, OdorR odorant receptor, odorant receptor, PBP periplasmic binding protein, periplasmic binding protein, PCR polymerase chain reaction, polymerase chain reaction, PherR pheromone receptor, pheromone receptor, PKA protein kinase A, protein kinase A, PKC protein kinase C, PLC phospholipase C, phospholipase C, PRL prolactin, prolactin, PTH parathyroid hormone, parathyroid hormone, PTHrP parathyroid hormone-related peptide, parathyroid hormone-related peptide, SL somatolactin, somatolactin, STC stanniocalcin, stanniocalcin, SW seawater-acclimated, seawater-acclimated, TMD transmembrane domain, transmembrane domain, VFT Venus flytrap., Venus flytrap., Extracellular calcium-sensing receptor, G protein-coupled receptor, Calcium homeostasis, Osmoregulation, Fish, Teleost, Elasmobranch

ISSN: 1095-6433
Sayı: 3
Cilt: 149
Sayfa: 225-245

26

sAC mediated translocation of V–H+–ATPase to the basolateral membrane in the Pacific spiny dogfish gill ionocytes

Dergi Makalesi

Kaynak :

Science Direct

Dergi:

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı:

Elsevier

Yazar(lar) :

Agnieszka K. Dymowska , Greg G. Goss

Yıl :

2009

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı Web Sitesi

Tam Metin

Ek Bilgiler

Kaydet

DOI : 10.1016/j.cbpa.2009.04.005

ISSN: 1095-6433
Sayı: 2
Cilt: 153
Sayfa: S64-S65

27

Hymenoptera flight muscle mitochondrial function: Increasing metabolic power increases oxidative stress

Dergi Makalesi

Kaynak :

Science Direct

Dergi:

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı:

Elsevier

Yazar(lar) :

Christopher P. Hedges , Reuben T. Wilkinson , Jules B.L. Devaux , Anthony J.R. Hickey

Yıl :

2019

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı Web Sitesi

Tam Metin

Özet Ek Bilgiler

Kaydet

Insect flight is a high intensity activity, but biomechanical and metabolic requirements may vary depending on life style and feeding mode. For example, bees generally feed on pollen and nectar, whereas wasps also actively hunt and scavenge heavy prey. These variations in metabolic demands may result in different capacities of metabolic pathways in flight muscle, and utilisation some of these pathways may come at a cost of increased free radical production. To examine how metabolic requirements and oxidative stress vary between species, we explored the variation in flight mechanics and metabolism of the honeybee (Apis mellifera), bumblebee (Bombus terrestris), and German wasp (Vespula germanica). Wing structures and flight muscle properties were compared alongside measures of oxygen flux and reactive oxygen species (ROS) production from permeabilised flight muscle. The wasp wing structure is best adapted for carrying heavy loads, with the highest wing aspect ratio, lowest wing loading, and highest flight muscle ratio. Bumblebees had the lowest wing aspect ratio and flight muscle ratio, and highest wing loading. Although wasps also had the highest rates of oxygen consumption during oxidative phosphorylation, oxygen consumption did not increase in the wasp muscle following chemical uncoupling, while it did for the two bee species. While mitochondrial glycerol 3-phosphate dehydrogenase (mGPDH) mediated oxygen flux was greatest in wasps, muscle fibres released greater amounts of ROS through this pathway. Overall, the wasp has maximised lifting capacities through varying wing and flight muscle mass and by maximising OXPHOS capacities, and this accompanies elevated ROS production.

DOI : 10.1016/j.cbpa.2019.01.002

Anahtar Kelimeler : Reactive oxygen species, Glycerol 3-phosphate dehydrogenase, Wing loading, Mitochondria, Flight muscle

ISSN: 1095-6433
Cilt: 230
Sayfa: 115-121

28

Alarm substance alters early embryonic development in two Danio species

Dergi Makalesi

Kaynak :

Science Direct

Dergi:

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı:

Elsevier

Yazar(lar) :

Sulayman Mourabit , Simon D. Rundle , John I. Spicer , Katherine A. Sloman

Yıl :

2009

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı Web Sitesi

Tam Metin

Ek Bilgiler

Kaydet

DOI : 10.1016/j.cbpa.2009.04.141

ISSN: 1095-6433
Sayı: 2
Cilt: 153
Sayfa: S105

29

Daily endocrine profiles in parr and smolt Atlantic salmon

Dergi Makalesi

Kaynak :

Science Direct

Dergi:

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı:

Elsevier

Yazar(lar) :

Lars O.E. Ebbesson , Björn Th. Björnsson , Peter Ekström , Sigurd O. Stefansson

Yıl :

2008

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı Web Sitesi

Tam Metin

Özet Ek Bilgiler

Kaydet

To elucidate possible mechanisms behind the endocrine control of parr–smolt transformation, the daily plasma profiles in thyroid hormones (TH; free thyroxine (FT4), total thyroxine (TT4), and total 3,5,3′-triiodothyronine (TT3)), growth hormone (GH) and cortisol were studied in Atlantic salmon parr and smolts under simulated-natural winter (8 L:16D) and spring (16.5 L:7.5D) photoperiods, respectively. Overall, TT4, TT3 and GH levels were higher in smolts than in parr, whereas FT4 levels fluctuated within the same range in parr and smolts. Significant diurnal changes in plasma TH were present in parr. Both FT4 and TT4 levels increased during the photophase and decreased during the scotophase, while TT3 levels followed an inverse pattern. Growth hormone showed no significant changes in parr. Changes in FT4, TT4, GH, and cortisol, but not TT3, levels, were observed in smolts with peak levels during both the photophase and scotophase for FT4, TT4 and GH. Plasma cortisol was not assayed in parr but in smolts the peaks were associated with dusk and dawn. In addition to the general increases in TH, GH and cortisol, the distinct endocrine differences in nighttime levels between parr in the winter and smolts in the spring suggest different interactions between TH, GH, cortisol and melatonin at these different time points. These spring scotophase endocrine profiles may represent synergistic hormone interactions that promote smolt development, similar to the synergistic endocrine interactions shown to accelerate anuran metamorphosis. The variations in these diurnal rhythms between parr and smolts may represent part of the endocrine mechanism for the translation of seasonal information during salmon smoltification.

DOI : 10.1016/j.cbpa.2008.08.017

Anahtar Kelimeler : Development, Diurnal, Fish, Hormone, Photoperiod, Rhythm, Salmo salar, Smoltification

ISSN: 1095-6433
Sayı: 4
Cilt: 151
Sayfa: 698-704

30

A1 Comparative Genomics and Proteomics and Identification of New Molecular Targets for Drug Action

Dergi Makalesi

Kaynak :

Science Direct

Dergi:

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı:

Elsevier

Yıl :

2005

Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology

Yayıncı Web Sitesi

Tam Metin

Ek Bilgiler

Kaydet

DOI : 10.1016/j.cbpb.2005.05.006

ISSN: 1095-6433
Sayı: 3
Cilt: 141
Sayfa: S77-S83

Yayın Yılı

Sınırla

Doküman Türü Tümü

Veri Tabanı Tümü

Dergi İsmi Tümü

Disiplin Tümü

Disipline Göre İlgililik

Alt Disiplin Tümü

Konu Tümü

Yayıncı Tümü

Lisan Tümü

Doküman Türü

Tümü

Veri Tabanı

Tümü

Dergi İsmi

Tümü

Disiplin

Tümü

Alt Disiplin

Tümü

Konu

Tümü

Yayıncı

Tümü

Lisan

Tümü