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  • 1
    Electronic Resource
    Electronic Resource
    Effects of Storage Temperature, Humidity and Duration on Ostrich Fern (Matteuccia Struthiopteris (L.) Todaro) Quality (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 54 (1989), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Storage of Ostrich ferns (fiddleheads) at temperatures above or below 0°C decreased storage life and marketable quality. Percent weight loss, ascorbic acid, bacterial load, yeast and mold loads generally increased and relative water content decreased with increased storage temperature above 0°C and duration. Fiddlehead absolute moisture and ascorbic acid decreased with extended storage at lower storage humidities. Marketable yields decreased with higher storage temperatures, lower storage humidity and extended storage durations. Optimum storage conditions of 0°C and 100% RH provided marketable yields of 95% and 76% after 16 and 32 days, respectively, while fiddlehead storage in water at 0°C for 15 days provided marketable yields of 97%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1989.tb08585.x
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of 3-acetylpyridine on tissue differentiation of the embryonic chick limb (1976)
    [s.l.] : Nature Publishing Group
    Nature 264 (1976), S. 267-269 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Eighty-four White Leghorn embryos at 3 d of incubation were windowed and sealed with Sellotape. At 6 d of incubation, 2mg of 3-AP (Sigma) in 100 µl of distilled water were dropped on to the embryo membranes of 56 of these, the remainder serving as controls. The eggs were resealed and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/264267a0
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  • 3
    Electronic Resource
    Electronic Resource
    Embryonic chick muscle produces an FGF-like activity (1996)
    Springer
    Cellular and molecular life sciences 52 (1996), S. 757-761 
    Details
    ISSN: 1420-9071
    Keywords: Vasculogenesis ; angiogenesis ; muscle ; embryonic ; metabolites ; fibroblast growth factor (FGF) ; chorioallantoic membrane (CAM)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Normal and pathological formation of blood vessels is of considerable interest both in terms of basic scientific processes and clinical applications. Angiogenic events in the adult are likely to represent persistence of developmental mechanisms, and embryos are therefore a suitable experimental model for these processes. Among embryonic tissues, muscle is particularly appropriate for investigation, since it is highly vascularised from early stages. There are a number of competing explanations of how this process is controlled. Bioassays offer advantages over conventional molecular localisation techniques, in that they reveal the presence of active processed forms of the molecules under study, rather than non-processed forms, or non-translated meassages. Using these techniques, we report here that embryonic chick muscle, taken from the stages at which blood vessels are forming, produces an angiogenic activity on the chick chorioallantoic membrane (CAM), and transforms NR6 cells in soft agar. Basic fibroblast growth factor (bFGF) is shown to be angiogenic on the CAM in the same way, and also transforms NR6 cells (NR6 cells lack functional epidermal growth factor/transforming growth factor-a receptors, and are believed to respond only to bFGF in this way). Anti-bFGF removes the transforming activity of the embryonic muscle. We conclude that this represents evidence that embryonic chick muscle is producing an FGF-like molecule which is capable of acting as an angiogenic agent at the appropriate times in development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01923985
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  • 4
    Electronic Resource
    Electronic Resource
    A proximo-distal gradient of FGF-like activity in the embryonic chick limb bud (1997)
    Springer
    Cellular and molecular life sciences 53 (1997), S. 447-451 
    Details
    ISSN: 1420-9071
    Keywords: Key words. Fibroblast growth factor (FGF); embryonic; limb; chick; gradient.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. In a microassay for anchorage-independent growth in soft agar, NR6 cells form colonies in a dose-dependent manner in the presence of fibroblast growth factor (FGF). Using this assay system, the ability of thin sequential slices of embryonic chick limb bud to promote colony formation was investigated. A functional gradient of colony-promoting ability along the proximo-distal axis of the developing chick limb bud (stages 22–26) was observed. The highest number of colonies was observed in the presence of the most distal slices, and colony number decreased progressively at proximal levels. This gradient was specifically eliminated by the addition of anti-FGF antibody to the assay, indicating that it was caused by a functional gradient of an FGF-like molecule. Limbs of stages 21–26 were assayed: before this time limb buds are too small to slice in the proximo-distal axis in the required manner. The FGF-like gradient was observed at stages 22 to 26.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000180050054
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  • 5
    Electronic Resource
    Electronic Resource
    Autecology of Fucus distichus ssp. distichus (Phaeophyceae: Fucales) in Nova Scotia, Canada (1975)
    Springer
    Marine biology 30 (1975), S. 305-324 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The autecology of Fucus distichus L. ssp. distichus was investigated at several sites on the Atlantic coast of Nova Scotia, Canada, throughout a 2-year period. This species is confined to high-littoral rock pools at exposed sites, where there appears to be little competition from other organisms. Water temperature, salinity, dissolved oxygen, and hydrogen-ion concentrations underwent both considerable seasonal and short-term variation. Pools with extremes of salinity did not contain F. distichus ssp. distichus. Receptacles are formed during winter, and by late spring they are cast. Sporelings were first visible during September; their development was slow, and these plants did not become reproductive until the second year. During the period February to May, rapid growth of new fronds occurred; an increase in both length and bulk of the plants resulted from this growth. Fronds of mature plants continued to elongate slowly throughout the summer and the early autumn with the formation of receptacles in winter. Plants were frequently damaged, which resulted in regeneration of new fronds from the wounded surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00390636
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  • 6
    Electronic Resource
    Electronic Resource
    The occurrence of D-(+)-1425-cyclohexanetetrol in monochrysis lutheri droop
    Amsterdam : Elsevier
    Tetrahedron Letters 7 (1966), S. 1527-1531 
    Details
    ISSN: 0040-4039
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0040-4039(00)75728-5
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  • 7
    Electronic Resource
    Electronic Resource
    Benthic Community Structure and Biomarker Induction in Grass Shrimp in an Estuarine System (1999)
    Springer
    Archives of environmental contamination and toxicology 37 (1999), S. 512-518 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract. The impact of polycyclic aromatic hydrocarbons (PAHs) and lead contamination on benthic community structure and grass shrimp (Palaeomonetes sp.) biochemical markers were investigated in a bayou that has been heavily contaminated by PAHs and heavy metals. The benthic community had decreased species richness as well as decreased numbers of individuals along a contamination gradient. Grass shrimp collected in the field showed a contaminant-gradient increase in heat shock protein 63 and cytochrome P450 1A (as measured by ECOD metabolism). Grass shrimp had elevated ECOD metabolism when exposed in the laboratory to sediments from the most contaminated site. However, individual variation was too great for statistically significant changes. In addition, heat shock protein levels were not significantly elevated in laboratory exposed shrimp. Benthic community structure and wild-caught grass shrimp are clearly impacted in this bayou.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002449900546
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  • 8
    Electronic Resource
    Electronic Resource
    Alteration of Leopard Frog (Rana pipiens) Metamorphosis by the Herbicide Acetochlor (1999)
    Springer
    Archives of environmental contamination and toxicology 37 (1999), S. 70-77 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract. Based on the geographic correlation between the use of the pre-emergent herbicide acetochlor [2-chloro-N-(ethoxymethyl)-N-(2-ethyl-6-methylphenyl) acetamide] and the natural range of Northern leopard frogs (Rana pipiens), we investigated the effects of acetochlor (ACETO) on frog metamorphosis. We specifically examined the interaction of ACETO with thyroid hormone (T3) and corticosterone (CORT), hormones that regulate natural metamorphosis. ACETO, T3, and CORT were administered via immersion. Growth, developmental stage, and onset of metamorphic climax (forelimb emergence, FLE) were measured. We examined three hypotheses: (1) ACETO may alter metamorphosis. Premetamorphic tadpoles with low endogenous T3 were exposed to ACETO ± 10−9 M T3 for 7 days. 67% of tadpoles exposed to ACETO + T3 attained FLE, while 0% of T3 treated animals did. (2) ACETO mimics T3 action at the thyroid receptor (TR). Tadpoles were pretreated with T3 for 3 days to induce TR expression, then treated for 7 days with vehicle (DMSO), T3, or ACETO ± T3. ACETO treatment after T3 priming did not accelerate FLE, suggesting that ACETO does not interact directly with the TR. Cotreatment with ACETO + T3 after T3 priming accelerated FLE relative to tadpoles primed with T3, then treated with T3. Because the ACETO + T3 acceleration of FLE appeared similar to the effect of CORT, we examined a third hypothesis: (3) ACETO may interact with CORT to accelerate FLE. Premetamorphic tadpoles were exposed to various doses of ACETO ± T3 in the presence or absence of 10−7 M CORT. CORT inhibited growth and hindlimb development and delayed FLE. ACETO never inhibited growth or hindlimb development, but ACETO did counteract the effects of CORT when T3 was present. ACETO consistently accelerated T3-induced metamorphosis, apparently interacting with T3 via a non-TR–mediated mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002449900491
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  • 9
    Electronic Resource
    Electronic Resource
    Bromide, a Substitute for Chloride in a Marine Algal Medium (1967)
    [s.l.] : Nature Publishing Group
    Nature 214 (1967), S. 604-605 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In natural waters the concentration of bromide is generally quite small; sea water contains about 0.065 parts per thousand. In some brine lakes and natural bitterns the concentration of bromide is considerably greater, and the Dead Sea may contain as much as 7 g/1. (0.068 molar sodium bromide)4. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/214604a0
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  • 10
    Electronic Resource
    Electronic Resource
    The effect of scale changes on repetitive patterns: Influence of 6-aminonicotinamide on feather germ number (1993)
    Springer
    Cellular and molecular life sciences 49 (1993), S. 1011-1015 
    Details
    ISSN: 1420-9071
    Keywords: Size-invariant ; size-dependent ; feather germ ; chick ; embryo ; wing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract There are many examples of patterned developing systems which are size invariant: if the total size of the system is reduced, then the pattern responds by changing its scale in such a way that the number of pattern elements remains constant. This phenomenon is one of the bases which underaly the formulation of the concept of positional information, one of the great unifying ideas in developmental biology. However, there are less common examples of patterns which are size dependent. In these, alterations of overall size lead to a reduction in pattern elements. Such size-dependent patterns are therefore of theoretical interest. Here we describe how the number of feather germs along the wing bud of the developing chick embryo responds to shortening of the limb, and consider the implications of these observations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02125650
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