Responses of the early chick embryo to external cAMP sources

Development ◽  
1979 ◽  
Vol 53 (1) ◽  
pp. 353-365
Author(s):  
Alan R. Gingle ◽  
Anthony Robertson
Keyword(s):  
Chick Embryo ◽  
Concentration Dependence ◽  
Ventral Surface ◽  
Embryonic Axis ◽  
Chick Embryos ◽  
Early Chick Embryo ◽  
Local Sources ◽  
Characteristic Concentration

Early chick embryos were stimulated with local sources of cAMP. Three major effects were observed: bending of the embryonic axis, attraction of cells on the ventral surface of the embryo, and disruption of the blastodisc. Each had a characteristic concentration dependence. These results are compared with those from studies of cells disaggregated from similar embryos.

An electrosurgical technique for the production of localized tissue ablations in the early chick embryo

Development ◽  
1971 ◽  
Vol 26 (1) ◽  
pp. 21-29
Author(s):  
R. K. Jordan
Keyword(s):  
Chick Embryo ◽  
Low Frequency ◽  
Alternating Current ◽  
Chick Embryos ◽  
Operating Microscope ◽  
Young Chick ◽  
Early Chick Embryo ◽  
Electrolytic Corrosion ◽  
Tungsten Metal

The passage of low-frequency alternating current was found superior to other methods considered for the production of small, discrete, electrolytic ablations in young chick embryos. Active electrodes of tungsten metal less than 5 µm in diameter were prepared by controlled electrolytic corrosion. These gave reproducible, discrete foci of destruction of the required size, with currents less than 2 mA. The identification of destroyed tissue areas was immediately apparent under the operating microscope and confirmed histologically. Preliminary studies on bilateral extirpation of the ultimobranchial primordia show the absence of the ultimobranchial bodies 6 days after destruction of the primordia at 96 h of incubation.

scholarly journals Misexpression of BRE gene in the developing chick neural tube affects neurulation and somitogenesis

2015 ◽  
Vol 26 (5) ◽  
pp. 978-992 ◽  
Author(s):  
Guang Wang ◽  
Yan Li ◽  
Xiao-Yu Wang ◽  
Manli Chuai ◽  
John Yeuk-Hon Chan ◽  
...  
Keyword(s):  
Chick Embryo ◽  
Embryonic Development ◽  
Neural Crest ◽  
Embryo Development ◽  
Neural Tube ◽  
Neural Crest Cells ◽  
Chick Embryos ◽  
Early Chick Embryo

This is the first study of the role of BRE in embryonic development using early chick embryos. BRE is expressed in the developing neural tube, neural crest cells, and somites. BRE thus plays an important role in regulating neurogenesis and indirectly somitogenesis during early chick embryo development.

Effect of various inhibitors on several enzymes and other biochemical substances in chick embryo explants

Development ◽  
1964 ◽  
Vol 12 (2) ◽  
pp. 219-227
Author(s):  
R. W. Newburgh ◽  
Alice Clark ◽  
Audrey Wilson ◽  
Marion Scholz
Keyword(s):  
Chick Embryo ◽  
Lipid Synthesis ◽  
Biosynthetic Pathways ◽  
Chick Embryos ◽  
Chemical Changes ◽  
Early Chick Embryo ◽  
Early Embryos ◽  
The Media ◽  
Insight Into

Earlier studies in our laboratory indicated the predominance of pentose cycle activity in early embryos (Jolley, Cheldelin & Newburgh, 1959; Coffey, 1963). In addition a correlation was demonstrated between enzymes generating reduced triphosphopyridine nucleotide and lipid synthesis (Bieber, Cheldelin & Newburgh, 1962; Baker & Newburgh, 1963). Since several of the biosynthetic pathways involve this compound, it is conceivable that in a rapidly growing system such as the early chick embryo enzymes generating TPNH may play a major rôle. We have chosen to use explants of chick embryos in an attempt to gain insight into the relation of changes of these enzymes with other chemical changes which may more directly relate to differentiation. These latter changes include synthesis of such macromolecules as DNA, RNA, hemoglobin, collagen and myosin. This method permits the addition of certain chemicals to the media such as substrates or inhibitors (Hayashi et al., 1959), allowing easy manipulation of the environment.

scholarly journals Identification of Novel Hemangioblast Genes in the Early Chick Embryo

Cells ◽  
2018 ◽  
Vol 7 (2) ◽  
pp. 9 ◽  
Author(s):  
José Serrado Marques ◽  
Vera Teixeira ◽  
António Jacinto ◽  
Ana Tavares
Keyword(s):  
Chick Embryo ◽  
Early Chick Embryo

Organ Antigen in the Early Chick Embryo

1948 ◽  
Vol 68 (2) ◽  
pp. 263-266 ◽  
Author(s):  
A. M. Schechtman
Keyword(s):  
Chick Embryo ◽  
Early Chick Embryo

Is there a ventral neural ridge in chick embryos? Implications for the origin of adenohypophyseal and other APUD cells

Development ◽  
1980 ◽  
Vol 57 (1) ◽  
pp. 71-78
Author(s):  
N. B. Levy ◽  
Ann Andrew ◽  
B. B. Rawdon ◽  
Beverley Kramer
Keyword(s):  
Neural Crest ◽  
Endocrine Cells ◽  
Ventral Surface ◽  
Neural Plate ◽  
Chick Embryos ◽  
Serial Sections ◽  
Apud Cells ◽  
Surface Ectoderm ◽  
Neural Ectoderm ◽  
Thickened Surface

Two- to ten-somite chick embryos were studied in order to ascertain whether, as has been proposed, there exists a ‘ventral neural ridge’ which gives rise to the hypophyseal (Rathke's) pouch. Serial sections and stereo-microscopy were used. The neural ridges arch around the rostral end of the embryo onto the ventral surface of the head, but no evidence was found for their extension to form a ‘ventral neural ridge’ reaching the stomodaeum: in fact a considerable expanse of non-thickened surface ectoderm was seen to separate the ventral portions of the neural ridges from the stomodaeum. The thickening of neural ectoderm which does appear on the ventral surface of the head results from apposition and fusion of the opposite neural ridges flanking the neural plate and thus the tip of the anterior neuropore - the classically accepted mode of closure of the neuropore. These findings are in accord with the generally accepted concept of the origin of thehypophyseal pouch rather than with its derivation from a ‘ventral neural ridge’. No sign of neural crest formation was encountered ventrally; this observation excludes the possibility that endocrine cells of the APUD series could originate from neural crest in this region.

Extragonadal distribution of primordial germ cells in the early chick embryo

1988 ◽  
Vol 222 (1) ◽  
pp. 90-94 ◽  
Author(s):  
Masao Nakamura ◽  
Takashi Kuwana ◽  
Yukihiko Miyayama ◽  
Toyoaki Fujimoto
Keyword(s):  
Chick Embryo ◽  
Germ Cells ◽  
Primordial Germ Cells ◽  
Early Chick Embryo
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