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  • 1
    Electronic Resource
    Electronic Resource
    Responses of the genital system and the urinogenital papilla of the female catfish,Heteropneustes fossilis (Bloch) to sex hormones (1950)
    Springer
    Development genes and evolution 144 (1950), S. 257-264 
    Details
    ISSN: 1432-041X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Intraperitoneale Injektionen von Diäthylstilböstrol und von Testosteronpropionat haben bei Heteropneustes fossilis ausgesprochene Veränderungen an den weiblichen Geschlechtsorganen und an der Urogenitalpapille zur Folge. Bei den Hormonempfängern kommt es zu einer beträchtlichen Hypotrophie der Keimdrüse wie des Ovidukts. Im Genitalsystem der Versuchstiere sind auch deutliche histologische Veränderungen nachzuweisen. Eine bemerkenswerte Folgeerscheinung ist die Hemmung der Urogenitalpapille der behandelten Fische. Es ist anzunehmen, daß die Veränderungen im Eierstock und im Eileiter durch die Geschlechtshormone über eine Hemmung der gonadotropen Aktivität der Hypophyse veranlaßt werden. Die Veränderungen an der Urogenitalpapille beweisen, daß dieses Organ beim weiblichen Heteropneustes den Charakter eines wahren sekundären Geschlechtsmerkmales besitzt und unter der östrogenen Kontrolle des Eierstocks steht.
    Notes: Summary Intraperitoneal injections of diethylstilbestrol and testosterone propionate into the catfish,Heteropneustes fossilis (Bloch) elicited pronounced changes in the female reproductive system and the urinogenital papilla. Considerable gonadal and oviducal hypotrophy occurred in the hormone recipients. Marked histological alterations were also encountered in the genital system of the experimental females. Another interesting response was the inhibition of the urinogenital papilla of the treated fishes. It is suggested that the changes in the ovary and the oviduct were induced by the sex hormones throught the inhibition of the gonadotrophic activity of the anterior hypophysis. The changes in the urinogenital papilla proved that this structure in the female catfish is a true secondary sexual character and is under the estrogenic control of the ovary.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00586359
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  • 2
    Electronic Resource
    Electronic Resource
    On the occurrence of feulgen positive nucleoli in adrenocortical cells of the pigeon (1961)
    Springer
    Naturwissenschaften 48 (1961), S. 389-390 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00623965
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  • 3
    Electronic Resource
    Electronic Resource
    Histomorphic changes following chronic adrenocortical activation and inhibition in the pigeon (1970)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 130 (1970), S. 257-269 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Gravimetric and histologic modifications in the pigeon were studied following chronic therapy with ACTH and metopirone (SU 4885) for a period of 15 days. The organs studied were proventriculus, duodenum, heart, kidney, salivary gland, pancreas, liver, uropygial gland, thymus, spleen, bursa fabricii, testis, ovary, islets of Langerhans, adenohypophysis, thyroid and interrenal and chromaffin tissue of the adrenal gland. Induced states of hyper- and hypoadrenocorticalism elicited pathomorphic changes in endocrine and reproductive systems and some other organs of the pigeon. There were many differences and similarities in the nature of response of some organs following the two experimental conditions. Many of these cellular interactions might have resulted from alteration of interrenal function in the pigeon.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051300210
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  • 4
    Electronic Resource
    Electronic Resource
    Influence of age and splanchnic nerve on the action of melatonin in the adrenomedullary catecholamine content and blood glucose level in the avian group (1988)
    Springer
    Journal of comparative physiology 158 (1988), S. 601-607 
    Details
    ISSN: 1432-136X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A single intraperitoneal (IP) melatonin injection (0.5 mg/100 g body wt.) caused an increase in norepinephrine (NE) fluorescence and elevation of NE content in newly-hatched pigeons (Columba livia), but a reduction of NE fluorescence and depletion of NE content in the adrenal medulla of newly-hatched crows (Corvus splendens) after 0.5 h of treatment. In contrast, in adults melatonin caused increase in NE fluorescence and elevation of NE content only in the parakeet (Psittacula krameri). Half an hour of IP melatonin treatment (0.5 mg/100 g body wt.) induced release of epinephrine (E) from the adrenal medulla of newly-hatched pigeon and parakeet. In contrast, in the adults melatonin caused more than a two-fold increase in E in the pigeon, and a significant increase in the crow. Single IP melatonin injection (0.5 mg/100 g body wt.) caused hypoglycemia in the newly-hatched parakeet and adult pigeon, and hyperglycemia in newly-hatched pigeon after 0.5 h of treatment. Melatonin failed to regulate glucose homoeostasis in newly-hatched and adult crow. Splanchnic denervation of the left adrenal gland was performed in the adult pigeon. The right adrenal served as the innervated gland. Melatonin-induced modulation of catecholamines following a single IP injection (0.5 mg/100 g body wt.) revealed significant increases in NE fluorescence and NE content at 4 and 12 h after treatment in the denervated gland only, which gradually approached normal levels 9 days after treatment. In contrast, E content showed more than a two-fold increase over the control value in both the innervated and denervated glands 0.5 and 24 h after treatment. At 9 days after treatment, E content showed significant depletion in the innervated gland. The results of this study indicate that melatonin modulates catechol hormone content in avian adrenal medulla, and also regulates glucose homoeostasis (except in the crow). The splanchnic nerve plays a vital role in the synthesis of NE but has no effect on E.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00692569
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  • 5
    Electronic Resource
    Electronic Resource
    Influence of age and splanchnic nerve on glucagon-induced changes of adrenomedullary catecholamine content and blood glucose level in the avian group (1991)
    Springer
    Journal of comparative physiology 161 (1991), S. 532-536 
    Details
    ISSN: 1432-136X
    Keywords: Avian adrenal medulla ; Catecholamine ; Blood glucose ; Age ; Splanchnic nerve ; Glucagon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Glucagon (0.1 mg · 100 g body wt-1) increased norepinephrine (NE) content in adult pigeon (31%) and parakeet (58%), decreased NE content in the adrenal medulla of newly-hatched pigeon (36%), parakeet (52%), and crow (44%) 0.5 h after treatment. Epinephrine (E) content decreased to 26% and 59% of control values, respectively, in newly-hatched pigeon and parakeet 0.5 h after treatment. Glucagon produced hyperglycemia irrespective of age and species. The results indicate that aging modulates glucagon-induced changes of catecholamine (CA) content. In the innervated (I) adrenal gland of pigeon, glucagon caused a 31% increase of NE content 0.5 h after injection, a 46% decrease of NE content 12 h after injection, and a 192% increase of NE 24 h after injection. In the I gland of pigeons, glucagon also caused a 61% decrease of E content 4 h after injection, and brought about a 100% increase of E 24 h after injection. Glucagon-induced changes of CA content differ significantly between the I and denervated (D) glands. The results indicate that the splanchnic nerve regulates release and/or resynthesis of CA induced by glucagon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00257909
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  • 6
    Electronic Resource
    Electronic Resource
    Role of splanchnic nerve on steroid-hormone-induced alteration of adrenomedullary catecholamines in untreated and reserpinized pigeon (1991)
    Springer
    Journal of comparative physiology 161 (1991), S. 598-601 
    Details
    ISSN: 1432-136X
    Keywords: Steroid hormones ; Reserpine ; Catecholamine ; Adrenal medulla ; Splanchnic nerve ; Pigeon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The aim of the present investigation was to ascertain (1) the effect of steroid hormones (corticosterone, dexamethasone, deoxycorticosterone, progesterone, testosterone and oestrogen) on the neural regulation of adrenomedullary catecholamine (CA) content, and (2) the neural modulation of the effect of glucocorticoid hormones (corticosterone and dexamethasone) on reserpine-induced resynthesis of CA. The experiment was conducted on unilaterally splanchnic-denervated pigeons. The findings revealed that 7 consecutive days of steroid treatments (2.5 mg·kg b.w.-1, i.m.) resulted in significant changes of CA content. Interestingly, the changes of epinephrine (E) content differed significantly between the innervated and denervated glands. This clearly indicates that the splanchnic nerve regulates steroid-induced alterations of E content in the pigeon. The results further revealed that the glucocorticoid hormones augmented reserpine-induced resynthesis of CA specifically in the innervated glands. This confirms that the splanchnic nerve is essential for the synergistic action of glucocorticoids and reserpine in accelerating resynthesis of CA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00260750
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  • 7
    Electronic Resource
    Electronic Resource
    Hypothalamic neurosecretion in relation to water deprivation in ploceids of arid and swampy zones (1967)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 123 (1967), S. 35-41 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The effects of 72 hours of dehydration on the hypothalamo-neuro-hypophyseal system have been compared in three avian species which originate from different climatic habitats but belong to the same genus, Lonchura. In L. malacca, which is an inhabitant of swampy, non-arid regions, the neurosecretory nuclei are activated and there is a depletion of neurosecretory material from the nuclear regions and neurosecretory tract, as well as from the neurohypophysis. In L. punctulata, an inhabitant of woods and grasslands, the supraoptic cells show signs of activation. To some extent, a depletion of the neurosecretory material is observed from the neurohypophysis. In the fibrous layer the continuity of the neurosecretory material along the tract is not maintained to such an extent as in the control. In L. malabrica, which lives in semi-arid regions, there is some activation of the supraoptic nuclei but there is little to no depletion of the aldehyde fuchsin-positive material from the neurohypophysis and the tract leading to it. The results of this investigation are indicative of a correlation between the neurosecretory mechanism and ecologic adaptation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051230104
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  • 8
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    Responses of the genital system and the urinogenital papilla of the female catfish,Heteropneustes fossilis (Bloch) to sex hormones (1950)
    Springer
    Details
    Publication Date: 1950-01-01
    Print ISSN: 0949-944X
    Electronic ISSN: 1432-041X
    Topics: Biology
    Published by Springer
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  • 9
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    On the occurrence of feulgen positive nucleoli in adrenocortical cells of the pigeon (1961)
    Springer
    Details
    Publication Date: 1961-01-01
    Print ISSN: 0028-1042
    Electronic ISSN: 1432-1904
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Published by Springer
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