Journal ArticleDOI
Identification of a juvenile hormone-like compound in a crustacean.
Hans Laufer,David W. Borst,F. C. Baker,C. C. Reuter,L. W. Tsai,David A. Schooley,C. Carrasco,M. Sinkus +7 more
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TLDR
Results indicate that JH-like compounds such as methyl farnesoate have regulatory roles in crustaceans.Abstract:
Juvenile hormone (JH) has central roles in the regulation of insect development and reproduction but has not previously been identified in other arthropod classes. The hemolymph of a crustacean, Libinia emarginata (Leach), has now been analyzed for JH-like compounds. Samples contained 0.003 to 0.030 nanogram of JH III per milliliter and 10 to 50 nanograms of methyl farnesoate per milliliter; methyl farnesoate is a compound structurally related to JH III that has JH bioactivity. Several tissues were examined for synthesis and secretion of JH-like compounds. Of these tissues, only the mandibular organs produced and secreted JH III and methyl farnesoate. However, microchemical analysis revealed that this JH III was racemic, and thus likely an artifactual oxidation product of methyl farnesoate. Secretion of methyl farnesoate was related to reproduction in females, with the highest rates observed in Libinia near the end of the ovarian cycle when oocyte growth and vitellogenesis are greatest. These results indicate that JH-like compounds such as methyl farnesoate have regulatory roles in crustaceans.read more
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Journal ArticleDOI
Alternate mating strategies of polymorphic males of Libinia emarginata appear to depend on methyl farnesoate
TL;DR: The spider crab Libinia emarginata has six male morphotypes that differ with respect to their appearance and reproductive readiness and methyl farnesoate (MF) blood levels suggest that MF may be involved in directing the reproductive behavior of different male morphotype.
Journal ArticleDOI
Detecting points as developmental delay based on the life-history development and urosome deformity of the harpacticoid copepod, Tigriopus japonicus sensu lato, following exposure to benzo(a)pyrene.
TL;DR: The nauplii and copepodid development of T. japonicus s.l. can be used as a useful biomaker for detecting developmental delay based on their entire life-history and the urosome deformity was used a good potential monitoring tool invading various chemicals and environmental contamination into water system.
Journal ArticleDOI
Stimulation of ovarian growth by methyl farnesoate and eyestalk ablation in penaeoidean model shrimp, Sicyonia ingentis Burkenroad, 1938
TL;DR: Although unilateral eyestalk ablation failed to induce vitellogenesis in juveniles, bilateral ablation induced viteLLogenesis, which indicates that juveniles are competent to undergo vitelliogenesis.
Journal ArticleDOI
The lobster mandibular organ produces soluble and membrane-bound forms of 3-hydroxy-3-methylglutaryl-CoA reductase
TL;DR: The MO of the lobster Homarus americanus has high levels of HMGR (3-hydroxy-3-methylglutaryl-CoA reductase) and most of the enzyme activity is soluble, implying that HMGR is regulated, in part, at the transcription level.
Journal ArticleDOI
The pubertal molt in Crustacea revisited
J. S.B. Ahl,H. Laufer +1 more
TL;DR: Male polymorphism in spider crab Libinia emarginata is evidence that the terminology “molt of puberty” is inappropriate and should be replaced with “differentiational” or “morphometric” molt.
References
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Journal ArticleDOI
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Journal ArticleDOI
The influence of substrate concentrations on the rate of insect juvenile hormone biosynthesis by corpora allata of the desert locust in vitro
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TL;DR: It is proposed that the described method may be usefully employed to assess the physiological changes in the enzymic competence of the glands to effect the last two stages in C(16) juvenile hormone biosynthesis.
Journal ArticleDOI
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Journal ArticleDOI
On the Excitation of Crustacean Muscle. I
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Journal ArticleDOI
Isolation, Structure, and Absolute Configuration of a New Natural Insect Juvenile Hormone from Manduca sexta
TL;DR: Two juvenile hormones are isolated from organ cultures of corpora allata of the tobacco hornworm moth, Manduca sexta Johannson, and are purified by high-resolution liquid chromatography and identified as methyl (2E, 6E)-(10R)-10,11-epoxy-3,7, 11-trimethyl-2,6-dodecadienoate, a new natural hormone.
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