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Precocious cessation of intestinal macromolecular transmission and sucrase development induced by insulin in adrenalectomized suckling rat
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Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Comparative Biochemistry and Physiology Part A: Physiology
Yayıncı:
Elsevier
Yazar(lar) :
Etsumori Harada , Bunei Syuto
Yıl :
1991
Comparative Biochemistry and Physiology Part A: Physiology
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1. 1. The role of insulin in the regulatory mechanisms governing cessation of intestinal absorption of macromolecules and sucrase development was studied in the adrenalectomized suckling rat (ADX rat). 2. 2. Intestinal absorption of bovine immunoglobulin (IgG) infused orally was dose-dependently suppressed to 35–75% in ADX rats repeatedly injected subcutaneously with insulin. 3. 3. When insulin was administered orally, the IgG absorption was also suppressed. 4. 4. Intestinal sucrase activity was also induced precociously by insulin administered subcutaneously and orally. 5. 5. These results suggest that insulin plays a role in the maturation of suppression mechanisms for macromolecular transmission and sucrase development in the small intestine of the suckling rat.
DOI : 10.1016/0300-9629(91)90009-2
ISSN: 0300-9629
Sayı: 3
Cilt: 99
Sayfa: 327-331
Sınıflandırma :
2
Blood glucose regulation in an intertidal crab, Chasmagnathus granulata (Dana, 1851)
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Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Comparative Biochemistry and Physiology Part A: Physiology
Yayıncı:
Elsevier
Yazar(lar) :
Euclydes A. dos Santos F° , Elton Pinto Colares
Yıl :
1986
Comparative Biochemistry and Physiology Part A: Physiology
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1. 1. Blood glucose regulation was investigated in an intertidal crab from south Brazil, Chasmagnathus granulata. 2. 2. There is no significant difference (P > 0.05) between blood glucose levels of males and females, ♂ 1.80 ± 0.56 mg/100 ml, ♀ 2.16 ± 0.56. 3. 3. There is no significant difference (P > 0.05) between blood glucose levels of normal and eyestalkless males until 96 hr after eyestalk ablation. 4. 4. There is a transitory but large increase in blood glucose levels of animals exposed to atmospheric air, the highest values being reached 1 hr after this exposure; 17.04 mg/100 ml. 5. 5. Handling and alien environment produce only a small increase in blood glucose levels of normal animals. 6. 6. There is a significant increase (P < 0.05) of crustacean hyperglycemie hormone (CHH) content in the eyestalks of animals exposed to atmospheric air for 1 hr, suggesting a higher rate of its synthesis during this period. 7. 7. Since the CHH seems to increase blood glucose by decreasing its utilization by the tissues and since there is a decrease in oxygen consumption in C. granulata exposed to atmospheric air, it is quite possible that this hormone is involved in the lack of the Pasteur effect, usually observed in facultative anaerobes.
DOI : 10.1016/0300-9629(86)90707-3
ISSN: 0300-9629
Sayı: 4
Cilt: 83
Sayfa: 673-675
Sınıflandırma :
3
Influence of glucagon and neurohypophysial hormones on plasma free fatty acid levels in the pigeon
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Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Comparative Biochemistry and Physiology Part A: Physiology
Yayıncı:
Elsevier
Yazar(lar) :
T.M. John , J.C. George
Yıl :
1973
Comparative Biochemistry and Physiology Part A: Physiology
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1. 1. The effect of intravenous injections of vasopressin, oxytocin, vasotocin and glucagon on the plasma free fatty acid (FFA) level was studied in the pigeon. 2. 2. The plasma FFA level in pigeons during winter was found to be higher than that in the fall. 3. 3. Vasopressin caused a decline and oxytocin a slight increase in plasma FFA at 15 min post-injection. Vasotocin brought about a highly significant increase at 30 min. Glucagon produced a marked increase in 5 min and when followed by vasotocin, a further increase was obtained. 4. 4. The possible significance of the lipolytic action and lipid mobilization, of oxytocin and vasotocin in bird migration, is discussed in the light of the release of the neurohypophysial neurosecretory material prior to migration reported earlier in two passerine migrants.
DOI : 10.1016/0300-9629(73)90462-3
Anahtar Kelimeler : Pigeon, avian blood, neurohypophysial hormones, vasopressin, vasotocin, oxytocin, glucagon, lipid mobilization, plasma free fatty acid, lipolysis, neurosecretion, physiology of migration
ISSN: 0300-9629
Sayı: 2
Cilt: 45
Sayfa: 541-547
Sınıflandırma :
4
Aging of the human eye lens—A morphological point of view
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Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Comparative Biochemistry and Physiology Part A: Physiology
Yayıncı:
Elsevier
Yazar(lar) :
G.F.J.M. Vrensen
Yıl :
1995
Comparative Biochemistry and Physiology Part A: Physiology
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DOI : 10.1016/0300-9629(95)00053-a
Anahtar Kelimeler : Aging, Eye lens, Human, Electron microscopy
ISSN: 0300-9629
Sayı: 4
Cilt: 111
Sayfa: 519-532
Sınıflandırma :
5
Osmotic constituents of the blood plasma and abdominal muscle of the stomatopod, Squilla mantis
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Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Comparative Biochemistry and Physiology Part A: Physiology
Yayıncı:
Elsevier
Yazar(lar) :
James D Robertson
Yıl :
1989
Comparative Biochemistry and Physiology Part A: Physiology
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1. 1. The principal osmotic constituents of plasma and muscle have been determined. 2. 2. Compared with sea-water, plasma shows increases in sodium and calcium, with reductions in potassium, magnesium, chloride and sulphate. Plasma is isosmotic with sea-water. 3. 3. Ions form about 47% of the constituents analysed in muscle, amino acids 33%, trimethylamine oxide 6.9% and betaine 12%. 4. 4. Calculated osmolalities of sea-water and plasma using osmotic coefficients agree reasonably well with determined osmolalities.
DOI : 10.1016/0300-9629(89)90127-8
ISSN: 0300-9629
Sayı: 3
Cilt: 94
Sayfa: 493-497
Sınıflandırma :
6
Chemical communication; the language of pheromones
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Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Comparative Biochemistry and Physiology Part A: Physiology
Yayıncı:
Elsevier
Yıl :
1993
Comparative Biochemistry and Physiology Part A: Physiology
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DOI : 10.1016/0300-9629(93)90351-4
ISSN: 0300-9629
Sayı: 2
Cilt: 104
Sayfa: 397
Sınıflandırma :
7
A comparison of the mineral composition of milk of domestic and captive wild equids (Equus Przewalski, E. Zebra, E. Burchelli, E. Caballus, E. Assinus)
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Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Comparative Biochemistry and Physiology Part A: Physiology
Yayıncı:
Elsevier
Yazar(lar) :
H.F Schryver , O.T Oftedal , J Williams , N.F Cymbaluk , D Antczak , H.F Hintz
Yıl :
1986
Comparative Biochemistry and Physiology Part A: Physiology
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1. 1. Milk samples were obtained in early and/or late lactation from Przewalski horses, Hartmann's zebras, Grant's zebras, domestic horses, ponies and a mule mare made pregnant by embryo transfer. 2. 2. Samples were compared for their content of total solids, ash, calcium, phosphorus, magnesium, sodium, potassium, copper, zinc and iron. 3. 3. Milk from the Przewalski horses, Hartmann's zebra and the domestic horse had similar mineral composition and the content of minerals was higher in early than in late lactation. 4. 4. Milk from the domestic mule contained the lowest concentration of calcium, phosphorus and zinc but the highest concentration of magnesium, sodium and potassium. 5. 5. Milk from the Grant's zebras contained more sodium than potassium, unlike milk from Przewalski horses, Hartmann's zebras or domestic horses in which there was more potassium than sodium.
DOI : 10.1016/0300-9629(86)90244-6
ISSN: 0300-9629
Sayı: 2
Cilt: 85
Sayfa: 233-235
Sınıflandırma :
8
Response of mouse plantaris muscle to functional overload: comparison with rat and cat
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Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Comparative Biochemistry and Physiology Part A: Physiology
Yayıncı:
Elsevier
Yazar(lar) :
Roland R. Roy , V.R. Edgerton
Yıl :
1995
Comparative Biochemistry and Physiology Part A: Physiology
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Functional overload (FO) of a muscle by removing its synergists results in a compensatory hypertrophy of the muscle. However, the extent of the response appears to be dependent, at least in part, on the activity and/or loading levels of the muscle following surgery. Thus, differences in the inherent physical activity levels across species may be an important factor to consider. In the present study, the effects of 8 weeks of FO on the isometric mechanical properties of the plantaris of mice (highly active) were determined and the findings compared with the results from previous studies performed on the plantaris of rats (highly active) and cats (less active). FO resulted in approximately a doubling of the mass, the physiological cross-sectional area and the maximum tetanic tension capacity of the mouse plantaris. Thus, the specific tension, i.e. the maximum tetanic tension per unit cross-sectional area, was similar in the plantaris of control and FO mice. Isometric twitch speed properties were unaffected, but the tension enhancement in response to an increase in the rate of stimulation showed the pattern of a “faster” muscle following FO. The fatigue resistance of the plantaris in FO mice was significantly higher than in control mice. Although the degree of hypertrophy that occurred in the mouse plantaris was similar to that observed after FO in rats and in cats that are exercised intermittently at high intensities, there were differences in the mechanical properties that may be related to the adaptability of species and/or the behavioral responses to the overload.
DOI : 10.1016/0300-9629(95)00062-c
Anahtar Kelimeler : Contractile properties, Fatigue, Functional overload, Mouse, Physiological cross-sectional area, Skeletal muscle hypertrophy, Specific tension
ISSN: 0300-9629
Sayı: 4
Cilt: 111
Sayfa: 569-575
Sınıflandırma :
9
An in vivo study of the role of pyloric caeca in water absorption in rainbow trout (Salmo gairdneri)
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Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Comparative Biochemistry and Physiology Part A: Physiology
Yayıncı:
Elsevier
Yazar(lar) :
G. Bogé , L. Lopez , G. Pérès
Yıl :
1988
Comparative Biochemistry and Physiology Part A: Physiology
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1. 1. The net water absorption by the trout intestine was studied using an intraluminal perfusion technique and non-absorbable markers (polyethylene glycol and Phenol Red). 2. 2. The absorption of pyloric caeca was compared to that of the remaining part of the intestine. Isotonic solutions were used with or without sodium content. 3. 3. In the absence of sodium, no water absorption was found in the caecum as in the post intestine. Secretory processes of water and sodium prevailed. 4. 4. When the perfusate contained sodium, water absorption took place in the caecum after a latency period of approximately 1 hr. This delay has been interpreted as the consequence of the filling up of the caeca. Sodium concentrations did not change appreciably in the collected perfusate. 5. 5. This net water absorption did not exist in the post intestine. Water and sodium were essentially secreted.
DOI : 10.1016/0300-9629(88)91584-8
ISSN: 0300-9629
Sayı: 1
Cilt: 91
Sayfa: 9-13
Sınıflandırma :
10
Effects of dietary carbohydrate and phenotype on thyroid hormones and brown adipose tissue locularity in adult LA/N-cp rats
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Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Comparative Biochemistry and Physiology Part A: Physiology
Yayıncı:
Elsevier
Yazar(lar) :
O.L. Tulp , C.T. Hansen , O.E. Michaelis
Yıl :
1989
Comparative Biochemistry and Physiology Part A: Physiology
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1. 1. Groups of lean and corpulent LA/N-cp rats were fed isoenergetic diets containing, 54% carbohydrate as maize starch (MS) or sucrose (SU), 20% protein, 16% mixed fats, plus other essential nutrients and fiber from 1.5–9 months of age. Final body weights of corpulent rats were 2–3 times those of their lean littermates, and were greater with SU than MS diet in both phenotypes. 2. 2. Interscapular brown adipose tissue (IBAT) mass was greater in corpulent than lean and was greater with SU than MS diet in lean but not corpulent rats. IBAT cell diameters and adipocyte volumes were generally similar in both phenotypes, and were not markedly affected by dietary carbohydrate type. 3. 3. Brown adipocyte locularity profiles were qualitatively similar in both phenotypes, and were morphologically indicative of thermogenic activity in both phenotypes. Locule profiles of corpulent animals contained a greater proportion of thermogenically less active types IV and V brown adipocytes than similarly fed lean animals, however, and locule distribution profiles were not influenced by diet. 4. 4. Serum T3 concentrations were similar in both phenotypes, were greater in SU than MS lean rats and were not influenced by diet in the corpulent phenotype. In contrast, serum thyroxine concentrations and percent thyroxine uptake were not influenced by diet or phenotype. 5. 5. These results are consistent with a partial impairment in BAT-mediated thermogenic activity in the corpulent phenotype and suggest that obesity in this strain may be due to factors other than biochemically defective brown adipose tissue thermogenesis.
DOI : 10.1016/0300-9629(89)90540-9
ISSN: 0300-9629
Sayı: 2
Cilt: 94
Sayfa: 225-229
Sınıflandırma :
11
Postprandial distribution of free amino acids between plasma and erythrocytes of common carp (Cyprinus Carpio L.)
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Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Comparative Biochemistry and Physiology Part A: Physiology
Yayıncı:
Elsevier
Yazar(lar) :
Konrad Dabrowski
Yıl :
1982
Comparative Biochemistry and Physiology Part A: Physiology
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1. 1. Free amino acid concentration in whole blood, plasma and erythrocytes washed with saline were determined in common carp of an individual weight of 500 g. 2. 2. Glutamate and aspartate have shown the highest concentrations within the erythrocytes. 3. 3. Among these amino acids which have shown the concentration ratio (erythrocyte-plasma) below unity were leucine, valine, histidine and lysine. 4. 4. Post-prandial level has shown the maximum concentration of free amino acids more or less 3 hr after feeding. 5. 5. Several amino acids have shown significant correlations between whole blood and plasma, and whole blood and erythrocyte concentrations. 6. 6. Levels of essential free amino acids in whole blood and plasma were positively correlated with their levels in the diet.
DOI : 10.1016/0300-9629(82)90161-x
ISSN: 0300-9629
Sayı: 4
Cilt: 72
Sayfa: 753-763
Sınıflandırma :
12
Intake of magnesium from water by freshwater tilapia fed on a low-Mg diet
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Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Comparative Biochemistry and Physiology Part A: Physiology
Yayıncı:
Elsevier
Yazar(lar) :
J.A. Van Der Velden , Z.I. Kolar , G. Flik
Yıl :
1991
Comparative Biochemistry and Physiology Part A: Physiology
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1. Freshwater tilapia, weighing between 1 and 9g, can survive low-magnesium feeding for at least 3 weeks. 2. The magnesium intake from water by freshwater tilapia do not differ under control and low-magnesium dietary conditions. 3. To allow for the growth-related magnesium uptake observed, freshwater tilapia fed on a low-magnesium diet have to regulate their magnesium losses strictly.
DOI : 10.1016/0300-9629(91)90242-5
ISSN: 0300-9629
Sayı: 1-2
Cilt: 99
Sayfa: 103-105
Sınıflandırma :
13
Ion channels of silkworm moth (Bombyx mori) antennae incorporated into planar lipid bilayer
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Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Comparative Biochemistry and Physiology Part A: Physiology
Yayıncı:
Elsevier
Yazar(lar) :
Yoshii Kiyonori , Takakuri Masauki , Kurihara Kenzo
Yıl :
1992
Comparative Biochemistry and Physiology Part A: Physiology
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1. 1. Ion channels of silkworm moth antennae were incorporated into a planar lipid bilayer and investigated under voltage-clamp conditions. 2. 2. Ion channels with elementary conductances of 33 and 100 pS in 100 mM K+ and 67 pS in 100 mM Na+ were recorded. 3. 3. Kinetics of the channel with conductance of 100 pS was investigated.
DOI : 10.1016/0300-9629(92)90524-t
ISSN: 0300-9629
Sayı: 2
Cilt: 101
Sayfa: 209-212
Sınıflandırma :
Tarih %99
Bilim Tarihi %100
14
Cellular calcium; a practical approach
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Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Comparative Biochemistry and Physiology Part A: Physiology
Yayıncı:
Elsevier
Yıl :
1992
Comparative Biochemistry and Physiology Part A: Physiology
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DOI : 10.1016/0300-9629(92)90307-c
ISSN: 0300-9629
Sayı: 3
Cilt: 103
Sayfa: 614
Sınıflandırma :
15
Mammalian parenting; biochemical, neurobiological and behavioral determinants
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Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Comparative Biochemistry and Physiology Part A: Physiology
Yayıncı:
Elsevier
Yıl :
1991
Comparative Biochemistry and Physiology Part A: Physiology
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DOI : 10.1016/0300-9629(91)90623-k
ISSN: 0300-9629
Sayı: 1
Cilt: 98
Sayfa: 174
Sınıflandırma :
16
The role of the skin of Rana pipiens in sulfate excretion
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Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Comparative Biochemistry and Physiology Part A: Physiology
Yayıncı:
Elsevier
Yazar(lar) :
John C Vanatta , Loy W Frazier
Yıl :
1987
Comparative Biochemistry and Physiology Part A: Physiology
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1. 1. The intact whole skin of Rana pipiens excretes sulfate and this excretion is increased by sulfate loading of the animal, 2. 2. Ninety-five percent of the excretion of sulfate seen following sulfate loading is via the skin, while a small amount is handled by the urinary system.
DOI : 10.1016/0300-9629(87)90484-1
ISSN: 0300-9629
Sayı: 2
Cilt: 88
Sayfa: 281-282
Sınıflandırma :
17
Changes in epidermal DNA, protein and protein synthesis during the molt cycle of the crayfish Orconectes sanborni (Faxon)
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Comparative Biochemistry and Physiology Part A: Physiology
Yayıncı:
Elsevier
Yazar(lar) :
C.Robert Humphreys , J.Ross Stevenson
Yıl :
1973
Comparative Biochemistry and Physiology Part A: Physiology
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1. 1. DNA content per unit wet weight epidermis dropped sharply at premolt, and rose sharply at postmolt. 2. 2. Protein content per cell rose progressively during premolt and declined progressively during postmolt. 3. 3. Specific activity developed by epidermal protein during the hour post-injection of 1-14C-dl-leucine exhibited maxima at stages C3−4 and D2 and minima at stages C1 and D1“.
DOI : 10.1016/0300-9629(73)90250-8
Anahtar Kelimeler : Ecdysis, DNA, protein synthesis in crayfish, crayfish, Orconectessanborni
ISSN: 0300-9629
Sayı: 4
Cilt: 44
Sayfa: 1121-1128
Sınıflandırma :
18
Uptake and secretion of technetium pertechnetate by the rat parotid gland
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Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Comparative Biochemistry and Physiology Part A: Physiology
Yayıncı:
Elsevier
Yazar(lar) :
Philip C Fox , Lipa Bodner , Mary R Bowers , Bruce J Baum
Yıl :
1986
Comparative Biochemistry and Physiology Part A: Physiology
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1. 1. The ability of acinar cells of the rat parotid gland to transport technetium pertechnetate (99mTcO−4) was examined. 2. 2. After intravenous injection, 99mTcO−4 was rapidly detected in parotid saliva. 3. 3. There was an excellent correlation between saliva and plasma 99mTcO−4 levels. The saliva to plasma ratio was always < 1, consistent with the inability of rat parotid gland duct cells to concentrate the anion. 4. 4. Output of 99mTcO−4 by the parotid gland closely mimicked fluctuations in parotid saliva flow rate. 5. 5. In vitro, enzymatically dispersed parotid acinar cells accumulated 99mTcO−4 from the incubation medium in a biphasic manner. This uptake was partially blocked by 10−4 M NaI. 6. 6. Cells which had accumulated 99mTcO−4showed increased radionuclide efflux after exposure to 10−5 M carbachol.
DOI : 10.1016/0300-9629(86)90149-0
ISSN: 0300-9629
Sayı: 3
Cilt: 83
Sayfa: 579-584
Sınıflandırma :
19
The pattern of nitrogen excretion during fasting of two fresh-water oligochaetes
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Comparative Biochemistry and Physiology Part A: Physiology
Yayıncı:
Elsevier
Yazar(lar) :
E.K. Tillinghast , D.G. Huffman
Yıl :
1973
Comparative Biochemistry and Physiology Part A: Physiology
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Kaydet Alıntıla
1. 1. Two species of fresh-water oligochaetes were analyzed for their nitrogen excretory pattern during fasting. 2. 2. Lumbricus rubellus exhibited a transition to ureotelism with fasting but still maintained a high level of ammonia output. 3. 3. Eisenoides lonnbergi remained ammonotelic for the length of the experiment with little or no urea voided. 4. 4. The data are compared with the terrestrial oligochaetes L. terrestris and Eisenia foetida.
DOI : 10.1016/0300-9629(73)90464-7
Anahtar Kelimeler : Nitrogen excretion, ammonia, urea, oligochaetes, Lumbricus rubellus, Eisenoides lonnbergi, fresh-water oligochaetes, Apolocystis gigantea
ISSN: 0300-9629
Sayı: 2
Cilt: 45
Sayfa: 555-557
Sınıflandırma :
20
Distension-sensitive receptors in the crop of the domestic fowl (Gallus domesticus)
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Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Comparative Biochemistry and Physiology Part A: Physiology
Yayıncı:
Elsevier
Yazar(lar) :
Joseph P Hodgkiss
Yıl :
1981
Comparative Biochemistry and Physiology Part A: Physiology
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Kaydet Alıntıla
1. 1. Two types of distension-sensitive receptors are present in the crop of the domestic chicken. 2. 2. One type of receptor responded to distension with a rapidly adapting spike discharge. 3. 3. The adaptation rate of the other receptor type was much slower. 4. 4. The slowly adapting receptor was capable of signalling distension of the crop for prolonged periods of time.
DOI : 10.1016/0300-9629(81)90397-2
ISSN: 0300-9629
Sayı: 1
Cilt: 70
Sayfa: 73-78
Sınıflandırma :
21
On the pump-induced cell volume changes
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Comparative Biochemistry and Physiology Part A: Physiology
Yayıncı:
Elsevier
Yazar(lar) :
S.N Ayrapetyan , M.A Sulejmanian
Yıl :
1979
Comparative Biochemistry and Physiology Part A: Physiology
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1. 1. The correlation between electrogenic Na-K-pump activity and completely isolated nerve cell volume changes was studied. 2. 2. Incubation in the cold (5°C) Ringer's solution and K-free medium caused the increase of cell volume. After transferring these neurons into the normal Ringer's solution at 22°C they returned to their initial volume. Removal of Cl ions from external solution accelerated the process of restoration. 3. 3. Ouabain at 10−4 M produced significant changing of cell volume over periods of 50–60 min, after which the cell volume stabilized. 4. 4. High external potassium concentration caused the cell shrinking in Cl-free solution. With addition of Cl ions the cell began to swell. 5. 5. The intracellular Na ions concentration was reduced without essentially changing K ion concentration with increasing of external potassium from 0–45 mM.
DOI : 10.1016/0300-9629(79)90585-1
ISSN: 0300-9629
Sayı: 4
Cilt: 64
Sayfa: 571-575
Sınıflandırma :
22
In vitro study of adrenergic stimulation of 32p incorporation into phospholipids of brown adipose tissue of control and cold-acclimated rats
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Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Comparative Biochemistry and Physiology Part A: Physiology
Yayıncı:
Elsevier
Yazar(lar) :
C. Senault , R. Meister , R. Portet
Yıl :
1988
Comparative Biochemistry and Physiology Part A: Physiology
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Kaydet Alıntıla
1. l. 32P-labelled inorganic phosphate incorporation into total and mitochondrial phospholipids was studied, in vitro, on brown adipose tissue (BAT) of control and cold-acclimated rats. 2. 2. It was found that norepinephrine acts as in vivo, on BAT phospholipid metabolism via alpha 1 adrenergic receptors specifically increasing phosphatidic acid and phosphatidylinositol turnover with the same magnitude in both groups. 3. 3. Cold-induced alpha 1 adrenergic desensitization is not as important as cold-induced beta adrenergic desensitization. 4. 4. No specific effect of norepinephrine was seen in mitochondrial phospholipid turnover.
DOI : 10.1016/0300-9629(88)91606-4
ISSN: 0300-9629
Sayı: 1
Cilt: 91
Sayfa: 141-146
Sınıflandırma :
23
Daily energy expenditure and water flux in black-rumped waxbills (Estrilda troglodytes)
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Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Comparative Biochemistry and Physiology Part A: Physiology
Yayıncı:
Elsevier
Yazar(lar) :
Wesley W Weathers , Kenneth A Nagy
Yıl :
1984
Comparative Biochemistry and Physiology Part A: Physiology
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1. 1. Daily energy expenditure (HTD) and water flux rates were measured in free-flying, aviaryhoused Estrilda troglodytes using doubly labeled water (H3H18O). 2. 2. Daily energy expenditure of these 6.7 g passerine birds averaged 57.4 ±15.1 kJ/day (mean ± SD). This is 3.8 times the waxbill's average daytime basal metabolic rate, as determined by respiratory gas exchange with an open-circuit respirometer. We estimate that between 13 and 24% HTD of was used to maintain body temperature at night. 3. 3. Daily water efflux averaged 291 ± 36 ml (kg day)−1, equivalent to 41% of the total body water pool per day. 4. 4. Daily water influx, 222 ± 58 ml (kg day)−1, was 24% lower than efflux, indicating that these small seedeating birds were unable to meet their water needs without drinking under the conditions of our experiments.
DOI : 10.1016/0300-9629(84)90211-1
ISSN: 0300-9629
Sayı: 3
Cilt: 77
Sayfa: 453-458
Sınıflandırma :
Biyotıp %85
Enerji %23
Enerji %91
24
Seasonal variations of serum glucose levels in a migratory songbird, Sylvia borin
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Comparative Biochemistry and Physiology Part A: Physiology
Yayıncı:
Elsevier
Yazar(lar) :
Franz Bairlein
Yıl :
1983
Comparative Biochemistry and Physiology Part A: Physiology
Yayıncı Web Sitesi
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Kaydet Alıntıla
1. 1. Ten juvenile Garden Warbler Sylvia borin were maintained in controlled laboratory conditions and their blood sugar concentrations were determined regularly. 2. 2. The concentrations of blood glucose were higher during the migratory periods both in autumn and in spring. 3. 3. The study reveals a seasonal rhythm in the blood glucose levels in a migratory songbird. 4. 4. The laboratory data are supported by data of wild birds trapped at different times.
DOI : 10.1016/0300-9629(83)90345-6
ISSN: 0300-9629
Sayı: 2
Cilt: 76
Sayfa: 397-399
Sınıflandırma :
Çevre %27
Ekoloji %99
25
Representation of sound pressure and particle motion information in the midbrain of the goldfish
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Comparative Biochemistry and Physiology Part A: Physiology
Yayıncı:
Elsevier
Yazar(lar) :
Richard R. Fay , Cynthia M. Hillery , Kim Bolan
Yıl :
1982
Comparative Biochemistry and Physiology Part A: Physiology
Yayıncı Web Sitesi
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Kaydet Alıntıla
1. 1. Averaged evoked responses from multiple electrodes in the goldfish midbrain (torus semicircularis) area were recorded in response to acoustic stimulation by loudspeaker and to direct vertical vibration of the head. 2. 2. Relative pressure and displacement sensitivity was such that in the far field, the response to sound pressure would dominate the response to particle motion by 40–90 dB. 3. 3. Swimbladder deflation caused a flat (70–1000 Hz) loss in pressure sensitivity ranging from 20 to over 50 dB, and led to an enhanced response to vibration at low frequencies. 4. 4. The goldfish midbrain is not homogeneous with regard to relative pressure and motion sensitivity.
DOI : 10.1016/0300-9629(82)90387-5
ISSN: 0300-9629
Sayı: 2
Cilt: 71
Sayfa: 181-191
Sınıflandırma :
26
Primate In vitro fertilization research: preliminary results on the folliculogenic effects of three different ovulatory induction agents on the chacma baboon, Papio ursinus
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Comparative Biochemistry and Physiology Part A: Physiology
Yayıncı:
Elsevier
Yazar(lar) :
F Le R. Fourie , E Snyman , J.V Van Der Merwe , A Grace
Yıl :
1987
Comparative Biochemistry and Physiology Part A: Physiology
Yayıncı Web Sitesi
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Kaydet Alıntıla
1. 1. A study was conducted on the chacma baboon, Papio ursinus with three ovulation induction agents in an effort to define a preferential stimulatory protocol with regards to the number and quality of oocytes obtained. 2. 2. Three folliculogenic agents applied in four stimulatory protocol regimens comprised clorniphene citrate in a high (100mg/day) and low (50mg/day) dosage, a combination of clomiphene citrate and pregnant mare serum, and human menopausal gonadotropin. 3. 3. A total of 159 oocytes were aspirated by laparotomy from 10 baboon females in 20 induced cycles with an average of 8.0 ± 5.4 oocytes per aspiration. 4. 4. The highest mean number of oocytes (11.3 ± 6.7) were obtained with the clomiphene/pregnant mare serum gonadotropin combination. 5. 5. The best fertilization rate was obtained with clomiphene 50 mg. 6. 6. The highest incidence of oocytic cleavage and embryo transfer were achieved with human menopausal gonadotropin (14.8%).
DOI : 10.1016/0300-9629(87)90010-7
ISSN: 0300-9629
Sayı: 4
Cilt: 87
Sayfa: 889-893
Sınıflandırma :
27
Copper, zinc, calcium, magnesium and phosphate in the gonads and livers of Sockeye salmon (Oncorhynchus nerka) during spawning migration
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Comparative Biochemistry and Physiology Part A: Physiology
Yayıncı:
Elsevier
Yazar(lar) :
G.L Fletcher , M.J King
Yıl :
1978
Comparative Biochemistry and Physiology Part A: Physiology
Yayıncı Web Sitesi
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Kaydet Alıntıla
1. 1. Concentrations and total amounts of Cu2+. Zn2+, Ca2+, Mg2+ and PO3−4 were measured in gonads and livers of Sockeye salmon during spawning migration. 2. 2. Total ovarian Zn2+, Ca2+, Mg2+ and PO3−4 increased during migration, while total testicular Zn2 + declined. 3. 3. Salmon do not eat during migration; therefore the essential elements incorporated by the ovary must have been absorbed from the water or released from storage within the body. 4. 4. It is hypothesized that almost all of the ovarian Zn2+ and most of the Ca2+, Mg2+ and PO3−4 was obtained from body stores other than the liver.
DOI : 10.1016/0300-9629(78)90216-5
ISSN: 0300-9629
Sayı: 2
Cilt: 60
Sayfa: 127-130
Sınıflandırma :
28
Neural control of renal function in newly rehydrated Bedouin goats
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Comparative Biochemistry and Physiology Part A: Physiology
Yayıncı:
Elsevier
Yazar(lar) :
D. Shaham , I. Choshniak , J. Rosenfeld , C. Witenberg , K. Thurau , A. Shkolnik
Yıl :
1994
Comparative Biochemistry and Physiology Part A: Physiology
Yayıncı Web Sitesi
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Kaydet Alıntıla
Severely dehydrated Bedouin goats replenish their water deficit by drinking copiously. Their urine flow, that amounts to only 0.41 ± 0.10 ml/min prior to the drinking drops to about half this value immediately after drinking is completed. It remains lower than, or similar to the pre-drinking value for a long period. A retarded plasma renal flow and impeded rate of glomerular filtration were found to underlie the reduction in urine flow in the newly rehydrated goat. When dehydrated goats were injected with l mg/kg of propranolol, and then allowed to drink to satiety, their urine flow increased. Half an hour after drinking it amounted to 1.25 ± 0.07 ml/mm, and 30 min later, to twice this value. The rates of the renal plasma flow and glomerular nitration also increased compatibly. Propranolol is known to be a highly potent Mocker of effects induced by excitatory responses on the renal nerve. Presumably, the administration of propranolol eliminated a sympathetic stimulus that in control goats suppresses the rate of renal blood flow and consequently also of glomerular filtration. As plasma arginine vasopressin levels in the dehydrated Bedouin goats is reported to drop abruptly with the onset of the drinking, it is suggested that β adrenergic activity, rather than endocrine mechanisms, plays the major role in modulating renal function in newly rehydrated Bedouin goats. Under natural conditions it helps conserve the water consumed by the goat for periods when the animal is grazing in the desert far from a drinking site.
DOI : 10.1016/0300-9629(94)90273-9
Anahtar Kelimeler : Renal function, Rehydrated Bedouin goats, Urine flow, Glomerular nitration, Renal plasma flow, Propranolol, Arginine vasopressin
ISSN: 0300-9629
Sayı: 1
Cilt: 107
Sayfa: 57-61
Sınıflandırma :
29
Rhythmic multiple unit activity from the preoptic nucleus of the rainbow trout Salmo gairdneri under basal and stress conditions
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Comparative Biochemistry and Physiology Part A: Physiology
Yayıncı:
Elsevier
Yazar(lar) :
J.C Le Mevel , D Mabin
Yıl :
1984
Comparative Biochemistry and Physiology Part A: Physiology
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Kaydet Alıntıla
1. 1. Long-term MUA (multiple unit activity) from the NPO (preoptic nucleus) of anaesthetized and curarized rainbow trout was recorded under basal or stress conditions. 2. 2. Under basal conditions periodical bursting multiple unit discharges of 40–60 μV which lasted 2 min occurred 8 times per hr at a firing rate of about 15 spikes/sec in 43% of the trout tested. 3. 3. Water deprivation (30 sec) for the mouth and the gills inhibited MUA and the return of the water restored or increased the basal frequency of MUA in all the trout tested. 4. 4. The functional significance of these electrophysiological results is discussed in relation to possible parallel changes in neurohypophysial hormones secretion.
DOI : 10.1016/0300-9629(84)90600-5
ISSN: 0300-9629
Sayı: 3
Cilt: 78
Sayfa: 583-586
Sınıflandırma :
30
Some studies on blood of the Florida manatee, Trichechus manatus latirostris
Dergi Makalesi

Dergi Makalesi
Kaynak :
Science Direct
Dergi:
Comparative Biochemistry and Physiology Part A: Physiology
Yayıncı:
Elsevier
Yazar(lar) :
J.R White , D.R Harkness , R.E Isaacks , D.A Duffield
Yıl :
1976
Comparative Biochemistry and Physiology Part A: Physiology
Yayıncı Web Sitesi
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Kaydet Alıntıla
1. 1. Hematological data on the Florida manatee, Trichechus manatus latirostris have been collected. 2. 2. The red blood cells (129.5μ3) of the manatee are larger than those of the dolphin or man and contain 6.84 and 0.27μmoles/cm3 of 2,3-diphosphoglyceric acid and adenosine triphosphate, respectively. 3. 3. Serum electrolytes, blood chemistries and serum enzyme activities are very similar to those of man except for unusually low levels of glutathione reductase activity (15 μmoles/min per 100cm3 RBC). 4. 4. The whole blood P50 values for the manatee and baby manatee are 16.5 and 20.6mm Hg, respectively. 5. 5. The diploid chromosome number of this species is 48.
DOI : 10.1016/0300-9629(76)90070-0
ISSN: 0300-9629
Sayı: 4
Cilt: 55
Sayfa: 413-417
Sınıflandırma :

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