Molting and calcium deposition in decapod crustaceans

Kleinholz, L. H.

doi:10.1002/jcp.1030180111

Cited by 26 publications

(11 citation statements)

References 10 publications

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“…The determination of the amino acid sequence of CHH from C. maenas showed the hormone to be a larger molecule than expected from earlier gelfiltration and amino acid composition data [2,13]. In accordance with the results of others on CHHs from different species by S DS electrophoresis [14], these data suggested a minimal molecular mass of between 6 and 7 kDa, in contrast to the value of 8524 Da, as calculated here from the complete sequence.…”

Section: Discussionsupporting

confidence: 88%

Amino acid sequence of the crustacean hyperglycemic hormone (CHH) from the shore crab, Carcinus maenas

et al. 1989

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Crustacean hyperglycemic hormone (CHH) was isolated from sinus glands of Carcinus maenas, and its primary structure was determined by manual microsequencing, using the DABITC-PITC double-coupling method. The neurohormone consists of 72 amino acid residues (8524 Da). Three disulfide bridges are present and both the N-and C-terminus are blocked.CHH does not show significant sequence homology to any known peptide hormone or protein.Amino acid sequence; Crustacean hyperglycemic hormone; Neuropeptide; (Carcinus maenas)

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Section: Discussionsupporting

confidence: 88%

Amino acid sequence of the crustacean hyperglycemic hormone (CHH) from the shore crab, Carcinus maenas

et al. 1989

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“…Thus, in the second phase, the calcium concentration is constant, or slowly increases. Most reports indicate that the first phase continues for several hours to 1-2 days, although one experiment with the fiddler crab Uca pugilator showed it continuing for 20 days [6]. During our experiment, 4-6 days post-molt exoskeleton calcium concentrations continued to increase in both one-year-and three-year-old crabs, suggesting the first phase of calcification.…”

Section: Discussioncontrasting

confidence: 44%

“…On the other hand, the process of post-molt calcification in the exoskeleton was relatively slow compared with other crustaceans. Previous quantitative time-series studies have shown that the calcification process can be divided into two phases [6][7][8][9][10][11][12][13]. In the first phase, both the absolute amount and the concentration of calcium in the exoskeleton increases rapidly, whereas in the second phase, the absolute amount increases gradually concomitant with synthesis of the endocuticle matrix.…”

Section: Discussionmentioning

confidence: 99%

Post-molt processes of cuticle formation and calcification in the Japanese mitten crab Eriocheir japonicus

Sakamoto

Honto²,

Iguchi

et al. 2008

Fish Sci

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This study examines the following in the Japanese mitten crab: (1) the structure of the exoskeleton with special reference to its calcification; (2) the progression of post-molt cuticle formation and calcification. In the crab, the structure and calcification state of the exoskeleton at the molt and during the inter-molt stage were similar to those of other crustaceans. During the inter-molt, the exoskeleton consisted of four cuticle layers; the outermost epicuticle, the exocuticle, the endocuticle and the innermost membrane layer. Intense calcification was observed in the exo-and endocuticle. At the molt, the synthesis of the epi-and exocuticle was already complete, and the addition of the endocuticle began after the molt. Calcification of the exocuticle initiated soon after the molt, but there was a delay between endocuticle matrix synthesis and calcification. Histology showed that the process of calcification was similar to that in other crustaceans. However, calcium concentrations within the exoskeleton continued to increase and never reached the levels of the inter-molt stage at the end of the experiment. This suggests that the Japanese mitten crab is relatively slow to calcify compared to other crustaceans.

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“…It has been found that intervals between moults are decreased by a number of weeks or Ill-Onths when eyestalks are removed from decapods (Smith 1940, Megusar 1912, Kleinholz & Bourquin 1941a . It has been suggested that this effect is a result of removal of an organ that normally checks metabolic rate (Menke· 1911, Plankemann 1935, cf., Hanstrom 1939.…”

Section: Hormonal Influence On Moulting and Metabolic Ratementioning

confidence: 99%

Light, Eyestalk Chemical, and Certain Other Factors as Regulators of Community Activity for the Crayfish, Cambarus virilis Hagen

Roberts¹

1944

Ecological Monographs

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Molting and calcium deposition in decapod crustaceans

Cited by 26 publications

References 10 publications

Amino acid sequence of the crustacean hyperglycemic hormone (CHH) from the shore crab, Carcinus maenas

Amino acid sequence of the crustacean hyperglycemic hormone (CHH) from the shore crab, Carcinus maenas

Post-molt processes of cuticle formation and calcification in the Japanese mitten crab Eriocheir japonicus

Light, Eyestalk Chemical, and Certain Other Factors as Regulators of Community Activity for the Crayfish, Cambarus virilis Hagen

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