ABNORMAL EMBRYOS FROM DIAPAUSE-LIKE EGGS PRODUCED SPONTANEOUSLY OR EXPERIMENTLLY. A STUDY ON DIAPAUSING EMBRYO OF THE SILKWORM,<i>BOMBYX MORI</i>

Fukuda, Soichi; Kohno, Taro

doi:10.1111/j.1440-169x.1964.tb00197.x

Cited by 7 publications

(5 citation statements)

References 4 publications

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“…On the basis of the previous (Fukuda, 1951a, 1952, 1953a, b, c, 1962a, 1963, Fukuda and Kohno, 1964 and the present findings, it appears highly probable that, in diapause egg-producer pupae, liberation of diapause factor from the suboesophageal ganglion is actively stimulated by the brain through oesophageal connectives and consequently neurosecretory material is released from DF cells as soon as it is produced.…”

supporting

confidence: 64%

“…In nondiapause egg-producing pupae, secretion of diapause factor from the suboesophageal ganglion is completely inhibited by the brain through the oesophageal connectives, whereas in diapause egg-producing pupae the brain stimulates the suboesophageal ganglion, by way of the oesophageal connectives, to release diapause factor in a quantity enough to make all growing eggs diapause ones (Fukuda, 1951a, b, 1952, 1953a, b, c, 1962a, 1963, Fukuda and Kohno, 1964. Nevertheless, little is known about neurosecretory cells involved in the production of diapause factor in the suboesophageal ganglion.…”

Section: Nagoyamentioning

confidence: 99%

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Diapause Factor-Producing Cells in the Suboesophageal Ganglion of the Silkworm, Bombyx mori L.

Fukuda

Takeuchi

1967

Proceedings of the Japan Academy

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supporting

confidence: 64%

Section: Nagoyamentioning

confidence: 99%

Diapause Factor-Producing Cells in the Suboesophageal Ganglion of the Silkworm, Bombyx mori L.

Fukuda

Takeuchi

1967

Proceedings of the Japan Academy

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“…However, the close resemblance of ML seen in rats (11,12) and the RF mouse (13,14) to the forms of the disease found in humans has been noted. In addition, the leukemogenic effect of ionizing radiation in both man and animals is well established (15).…”

mentioning

confidence: 92%

“…The larvae hatched from semidiapause eggs later than normal controls, and the embryos often failed to complete normal development. Fukuda and Kohno (14) suggested that these semidiapause eggs were derived from ovaries which had matured under the influence of insufficient amounts of the diapause factor. In our experiments, the semidiapause eggs which hatched later than the control eggs (nondiapause eggs) were scored as 50 percent.…”

mentioning

confidence: 99%

Silkworm Bombyx mori L.: Nature of Diapause Factor

Sonobe

Ohnishi

1971

Science

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The diapause factor which is responsible for the induction of embryonic diapause in the silkworm (Bombyx mori L.) was isolated from the heads of female moths. It was extracted with 80 percent ethanol or 80 percent methanol and was heat-stable and not dialyzable. Since the active material was precipitated with ammonium sulfate and lost when incubated with proteolytic enzymes, it is highly probable that the diapause factor is a protein or a complex molecule containing peptide bonds. Molecular sieve techniques revealed two species of the diapause factor. The molecular weight of the smaller species lies between 5,000 and 10,000.

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“…Diapause eggs and non-diapause eggs were obtained by the method of FUKUDA and KOHNO (1964). After oviposition, the eggs were incubated at 25°C and sampled at intervals for the experiments.…”

Section: Experimental Animalsmentioning

confidence: 99%

Cyclic Nucleotide-Dependent Protein Kinases From Silkworm Eggs: Occurrence of Two Cyclic Nucleotide-Dependent Protein Kinases, Changes in Their Activities and Levels of Cyclic Nucleotides During Development of the Eggs

et al. 1975

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Two cyclic nucleotide-dependent protein kinases, designated as protein kinase-I and -11, were obtained from the eggs of the silkworm, Bornbyx rnori. Protein kinase-I is highly dependent on cGMP, whereas protein kinase-I1 is dependent on CAMP. In developing non-diapause eggs, the level of cyclic nucleotide-dependent protein kinase activity is quite high but that in the diapause eggs is not. The developmental changes in the two protein kinases and the level of cyclic nucleotides were also studied during the development of the eggs.Protein kinases catalyze transfer of the terminal phosphate of ATP to a variety of protein substrates. The protein kinase which is stimulated by CAMP was first observed by WALSH et al. ( 1 968). Since that time, cyclic nucleotide-dependent protein kinases have been reported from various laboratories and their biological roles have also been discussed (WALSH and ASHBY, 1973). In insects, only a few reports concerning cyclic nucleotide-dependent protein kinases have been published.The first study on insect protein kinase was by Kuo et al. (1971), in which they reported the presence of CAMP-and cGMP-dependent protein kinases in cockroach, silkmoth and other insect species. Recently, TAKAHASHI et al. (1 974) obtained partially purified cGMP-dependent protein kinase from silkworm eggs and reported some o f its properties.

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ABNORMAL EMBRYOS FROM DIAPAUSE-LIKE EGGS PRODUCED SPONTANEOUSLY OR EXPERIMENTLLY. A STUDY ON DIAPAUSING EMBRYO OF THE SILKWORM,BOMBYX MORI

Cited by 7 publications

References 4 publications

Diapause Factor-Producing Cells in the Suboesophageal Ganglion of the Silkworm, Bombyx mori L.

Diapause Factor-Producing Cells in the Suboesophageal Ganglion of the Silkworm, Bombyx mori L.

Silkworm Bombyx mori L.: Nature of Diapause Factor

Cyclic Nucleotide-Dependent Protein Kinases From Silkworm Eggs: Occurrence of Two Cyclic Nucleotide-Dependent Protein Kinases, Changes in Their Activities and Levels of Cyclic Nucleotides During Development of the Eggs

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