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  • 1
    Electronic Resource
    Electronic Resource
    Action of biogenic amines on crustacean chromatophores: I. Differential effect of certain indolealkylamines on the melanophores of the crabsUca pugilator andCarcinus maenas (1970)
    Springer
    Cellular and molecular life sciences 26 (1970), S. 383-384 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Résumé Des extraits des pédoncules oculaires deCarcinus ont stimulé la dispersion de la mélanine in vivo et in vitro. Il paraît, pourtant, que le mécanisme par lequel la sérotonine provoque la dispersion de mélanine est différent de celui que déclenchent les extraits des pédoncules oculaires.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01896901
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  • 2
    Electronic Resource
    Electronic Resource
    Pigment-Dispersing Hormones (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 680 (1993), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1993.tb19676.x
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  • 3
    Electronic Resource
    Electronic Resource
    Primary Structure and Relative Potency of an Analog of β-PDH (Pigment-Dispersing Hormone) From the Crayfish Procambarus clarkii (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Periodontology 2000 4 (1991), S. 0 
    Details
    ISSN: 1600-0757
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: A pigment-dispersing hormone (PDH) from eyestalks of the crayfish Procambarus clarkii was purified by gel filtration, cation-exchange chromatography, partition chromatography, and reversed-phase HPLC. Based on automated sequencing and by the identical chromatographic behavior of the native PDH and the synthetic amidated form of the deduced sequence, the primary structure of Procambarus PDH has been established as: Asn-Ser-Glu-Leu-Ile-Asn-Ser-Ile-Leu-Gly-Leu-Pro-Lys-Val-Met-Asn-Glu-Ala-NH2. This peptide differs from β-PDH of the fiddler crab Uca pugilator at a single position, Glu17 in place of Asp17. Because of this substitution, Procambarus PDH was 4 to 7-fold less potent than β-PDH in causing pigment dispersion in the erythrophores, leucophores, and melanophores of Uca. In contrast, Procambarus PDH was 4-fold more potent than β-PDH in eliciting pigment dispersion in the erythrophores of Procambarus. These peptides displayed less marked differences in potency in triggering leucophore pigment dispersion and light-adaptational distal eye pigment movement in Procambarus. These findings indicate that the structural requirements for PDH-receptor interactions vary with the species and with the target cell type within a given species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0749.1991.tb00441.x
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  • 4
    Electronic Resource
    Electronic Resource
    Crustacean Pigment-Dispersing Hormones: Chemistry, Distribution and Actions (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Periodontology 2000 3 (1990), S. 0 
    Details
    ISSN: 1600-0757
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0749.1990.tb00383.x
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  • 5
    Electronic Resource
    Electronic Resource
    Relationship between the response of melanophores in the fiddler crab, Uca pugilator, and the concentration of eyestalk extract (1967)
    Springer
    Journal of comparative physiology 56 (1967), S. 232-236 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary 1. Eyestalks from the fiddler crab, Uca pugilator, were extracted directly in either water or absolute ethyl alcohol. Dosage-response curves for these extracts were then determined. 2. The melanin-dispersing response produced by the alcohol soluble material increased sharply with increasing concentration of the extract between 1 and 80 eyestalks/ml. In contrast, the dosage-response curves for the extracts prepared directly in water did not rise at all as sharply as did that of the alcohol extract. 3. A water extract seems to contain a substance which at the higher concentrations antagonized the melanin-dispersing hormone. Elimination of this antagonist by the technique of gel filtration resulted in an increased melanin-dispersing activity. 4. The possible action of absolute ethyl alcohol which results in a preparation of melanin-dispersing hormone from the eyestalk that is much more active at higher concentrations than a similar extract prepared in water is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00333668
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  • 6
    Electronic Resource
    Electronic Resource
    The influence of size on the response of melanophores in the fiddler crab, Uca pugilator, to eyestalk extracts (1969)
    Springer
    Journal of comparative physiology 62 (1969), S. 86-92 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary 1. The influence of size on the response of melanophores in Uca pugilator from Alligator Point, Florida and West Falmouth, Massachusetts was determined. 2. For the first time evidence is presented to indicate that the melanin-dispersing response evoked in eyestalkless crabs after injection of eyestalk extract increases with increase in the size of the crabs used in the assay. 3. The blood of small crabs has a higher titer of melanin-concentrating substance than does the blood of large crabs. Consequently smaller crabs would be more readily able to antagonize injected melanin-dispersing hormone, resulting in a smaller response. In addition, it is possible that the sensitivity of the chromatophores may increase with increase in size of the crab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00298044
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  • 7
    Electronic Resource
    Electronic Resource
    Solubility and stability properties of the melanin-dispersing substances from the eyestalks of the fiddler crab,Uca pugilator (1968)
    Springer
    Journal of comparative physiology 60 (1968), S. 1-13 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary 1. Extracts of fresh, freeze-dried, and heat-dried eyestalks prepared directly in physiological saline evoked nearly identical melanin-dispersing responses. The highly active ethanol-soluble fraction extractable from fresh eyestalks ofUca was to a great extent unextractable after the eyestalks were freeze-dried, heat-dried, or pretreated with a variety of organic solvents, whereas the melanin-dispersing substance in the ethanol-insoluble fraction of the eyestalk was resistant to these treatments. The melanin-dispersing substance obtained by direct extraction of the eyestalk in water is more resistant to treatment with organic solvents than the substance present in the ethanol-soluble fraction. 2. The melanin-dispersing activities of the eyestalk material soluble in various solvents showed no overall relationship with the dielectric constants of the solvents used. However, the melanin-dispersing activity was related to the dielectric constants of the normal alcohols used in the following decreasing order: methanol〉ethanol〉propanol〉butanol〉amyl alcohol. 3. Ether and isopropyl ether destroyed most of the melanin-dispersing material present in the ethanol-soluble and water-soluble fractions of the eyestalk, possibly due to excessive oxidation. 4. The melanin-dispersing material in the ethanol-soluble fraction of the eyestalk is greatly destroyed by heat. In contrast, the melanin-dispersing material in the water-soluble fraction of the eyestalk is resistant to heat. 5. The possibility that two melanin-dispersing substances are present in the eyestalks ofUca is considered and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00737091
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  • 8
    Electronic Resource
    Electronic Resource
    Chromatophorotropic activity of extracts of radial nerves from the starfish, Asterias amurensis (1970)
    Springer
    Journal of comparative physiology 67 (1970), S. 133-139 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary 1. Extracts of radial nerves from the starfish, Asterias amurensis, were assayed for chromatophorotropic activity in the fiddler crab, Uca pugilator. 2. The radial nerve extracts evoked pigment dispersion in the melanophores and pigment concentration in the leucophores and erythrophores of Uca. Gel filtration studies revealed that the chromatophorotropic material is different from the gamete-shedding substance. 3. Like chromatophorotropins in arthropod neural tissues, the chromatophorotropic material in the radial nerves appears to have a peptide nature. Chromatography on Bio-Gel P-6 and analysis of solubility properties indicate that the latter is different from the chromatophorotropins which have been found in crustaceans. 4. The possibility that these chromatophorotropic effects were caused by a single substance was discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00298523
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  • 9
    Electronic Resource
    Electronic Resource
    Control of distal retinal pigment migration in the fiddler crab Uca pugilator (1971)
    Springer
    Marine biology 9 (1971), S. 219-223 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Several concentrations of extracts prepared from the eyestalks of a specimen of Uca pugilator were injected into other U. pugilator individuals. The distal pigment of the eyes first became light adapted and then dark adapted, the whole process lasting 6 h. The mean integrated response for light adaptation increased progressively up to the highest tested extract (3 eyestalk equivalents/dose), but with the darkadapting response the maximal effect was produced by the extract containing 2 eyestalk equivalents/dose. Gel filtration of eyestalk extracts in Sephadex G-50 showed that the fractions associated with greatest light adaptation were also associated with greatest pigment dispersion in the melanophores. Almost no light or dark adaptation of the retinal pigment resulted from injections of eyestalk extracts treated with α-chymotrypsin which supports the interpretation that these substances are polypeptides of neurosecretory origin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00351382
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  • 10
    Electronic Resource
    Electronic Resource
    Effects of two dithiocarbamates on the grass shrimp,Palaemonetes pugio: Molt-related toxicity and inhibition of limb regeneration (1982)
    Springer
    Archives of environmental contamination and toxicology 11 (1982), S. 431-435 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract The effects of two dithiocarbamate formulations (Aquatreat® DNM-30 and Busan® 85) on the initiation and progression of limb regeneration following the removal of the left fifth walking leg (pereiopod) were studied with the estuarine grass shrimp,Palaemonetes pugio. Exposure to either Aquatreat DNM-30 or Busan 85 affected both the initiation and progression of limb regeneration; the shrimp exhibited dose-related inhibition of regenerative growth. The resultant EC50 values for inhibition of regenerative limb growth were well below the median lethal concentrations (LC50s) for grass shrimp. In tests with molting grass shrimp, Busan 85 was more acutely toxic than Aquatreat DNM-30.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01056069
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