Results 201 to 210 of about 25,867 (270)

Factors controlling the annual ovarian cycle in the toad Bufo bufo bufo (L.)

General and Comparative Endocrinology, 1975
Abstract Sixty adult-sized female toads (weighing 60–100 g) were brought into the laboratory (21°C) late in the active season (about 1 September) and fed at a moderate level (once a week) and a high level (thrice a week). Hemiovariectomy 1 month later showed that 23 toads were sexually mature, the ovaries containing populations of oocytes in late ...
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Developmental aspects of hexose metabolism in Bufo bufo

Journal of Experimental Zoology, 1982
AbstractDue to the close correlation between glucose mobilization and utilization within animal tissues, in this paper, the stages of appearance of phosphorylase, glucose‐6‐phosphatase and hexokinase as well as the levels of some intermediates of glucose metabolism have been investigated during Bufo bufo development.
M, Miranda, D, Botti, C, Pantani, A M, Ragnelli, M, di Cola   +4 more
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ESTIMATING SITE OCCUPANCY RATES WHEN DETECTION PROBABILITIES ARE LESS THAN ONE

Ecology, 2002
Nondetection of a species at a site does not imply that the species is absent unless the probability of detection is 1. We propose a model and likelihood-based method for estimating site occupancy rates when detection probabilities are 0.3). We estimated
D. MacKenzie, J. Nichols, Gideon B. Lachman, S. Droege, J. Andrew Royle, C. Langtimm   +5 more
semanticscholar   +1 more source

An ultrastructural study of the juxtaglomerular apparatus in the toad, Bufo bufo

Cell and Tissue Research, 1974
The fine structure of the juxtaglomerular apparatus in the toad, Bufo bufo was investigated.—It is suggested that the granules in the media cells of the afferent arteriole are formed from the Golgi apparatus. Many granules have a content of lamellar material. The media cells do not show the ultrastructural features of active secretory cells.
A P, Lamers, W J, Van Dongen, J A, Van Kemenade   +2 more
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Physiological differentiation of the mitochondria during Bufo bufo development.

Rivista di biologia, 2000
1) The oxygen consumption increases during Bufo bufo development in accordance with the two steps which border at the "heart beat" stage. 2) Cytochrome c oxidase activity is not proportional to the oxygen consumption: it is notable and constant in the first step, and it only increases in the second.
PETRUCCI D, CESARE, Patrizia
openaire   +3 more sources

Effects of hypophysectomy on structure and function of testis in adult toads, Bufo bufo bufo (L.)

General and Comparative Endocrinology, 1978
Abstract The pars distalis of the pituitary gland of sexually mature toads was extirpated, and the effects of this on spermatogenesis and the histological appearance of the interstitial tissue of the testis were studied. The rates of cell multiplication in the early phases of spermatogenesis were estimated from the frequency at which spermatocysts ...
K K, Guha, C B, Jørgensen
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Bufo bufo bufo d’Eugène Savitzkaya

Through his ethos as a precocious, spontaneous, free, and obsessive idler, Eugène Savitzkaya challenges the alleged superiority of humans to animals in his oeuvre. The work Bufo bufo bufo (1986) is proof of this: All forms of life endlessly intertwine, kill, eat, and make love to each other.
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Morphogenesis of the frontal organ in Bufo bufo during development

The Anatomical Record, 1990
AbstractMorphogenesis of the frontal organ in Bufo bufo was examined under transmission electron microscope. Many remarkable similarities to the frontal organ of other Amphibia Anura are observed. It originates from a diverticulum in the dorsal region of the neural tube.
Farnesi R. M., TEI, Simonetta, Vagnetti D., DI ROSA, Ines, FAGOTTI, Anna, Santarella B.   +5 more
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The renin-angiotensin system in Bufo arenarum and Bufo paracnemis

Comparative Biochemistry and Physiology Part A: Physiology, 1971
Abstract 1. 1. Toads have in their kidneys a renin-like enzyme and in their plasma an angiotensinogen-like substance. The incubation of toad plasma with kidney extracts gives rise to a pressor substance having properties similar to angiotensin. 2. 2. The renin content of the toad kidney expressed/g of kidney is higher in smaller animals. 3.
H, Nolly, J C, Fasciolo
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NEUROHYPOPHYSIS AND WATER METABOLISM IN THE TOAD, BUFO BUFO (L.)

Endocrinology, 1956
SEVERAL attempts have been made to evaluate the role of the neurohypophysis in the water metabolism of amphibians by extirpation of the hypophysis (1, 2, 3, 4, 5, 6, 7). However, since it is technically difficult to extirpate the neurohypophysis only the adenohypophysis was removed together with the neurohypophysis. Such experiments give no information
C B, JORGENSEN, P, ROSENKILDE, K G, WINGSTRAND   +2 more
openaire   +2 more sources