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  • Chemistry  (3)
  • Lymnaea stagnalis  (2)
  • size grade  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Molecular cloning of G protein α subunits from the central nervous system of the mollusc Lymnaea stagnalis
    Amsterdam : Elsevier
    FEBS Letters 314 (1992), S. 215-219 
    Details
    ISSN: 0014-5793
    Keywords: Central nervous system ; G protein α subunit ; Lymnaea stagnalis ; cDNA cloning
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0014-5793(92)81474-Z
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  • 2
    Electronic Resource
    Electronic Resource
    Localization of ovulation hormone-like neuropeptide in the central nervous system of the snail Lymnaea stagnalis by means of immunocytochemistry and in situ hybridization (1988)
    Springer
    Cell & tissue research 251 (1988), S. 477-484 
    Details
    ISSN: 1432-0878
    Keywords: Caudo-dorsal cells ; Neuropeptides ; Immunocytochemistry ; In situ hybridization ; Ovulation hormone ; Lymnaea stagnalis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The caudo-dorsal cells (CDC) in the cerebral ganglia of the pond snail Lymnaea stagnalis synthesize the 36-amino acid ovulation hormone (CDCH). We have used immuno-cytochemistry and in situ hybridization to reveal the localization of neurons and axons containing CDCH-like material. A monoclonal antibody to a fragment of CDCH and a cDNA probe encoding CDCH reacted with the CDC-system, with specific cell groups in the cerebral and pleural ganglia, and with individually occurring neurons throughout the central nervous system. The cells in the pleural ganglia, which were found in about 50% of the preparations studied, are considered as “ectopic” CDC. They are morphologically similar to CDC in their somal dimensions and axonal organization. By means of immuno-electron microscopy it was shown that these neurons contain secretory vesicles that are similar to those of the CDC. The neurons of the bilateral groups occurring in the cerebral ganglia in addition to the CDC are smaller and more intensely stained than the CDC. Axons of these small neurons probably have varicosities located on the CDC axons in the neuropil of the cerebral ganglion, indicating synaptic contacts. Two major axon tracts could be followed from (or toward) the neuropil of the cerebral ganglion. One tract runs from the cerebral gangion via the pleural and parietal ganglia to the visceral ganglion, giving off branches to most nerves emanating from these ganglia. The other tract could be traced through the cerebro-pedal connective to the pedal ganglia. Only in the right pedal ganglion was extensive axonal branching observed. The nerves emanating from this ganglion contained many more immunoreactive axons than those from the left pedal ganglion. A polyclonal antibody raised against the synthetic fragment of CDCH stained, in addition to the neurons and axons revealed with the monoclonal antibody and the cDNA probe, three other major groups of neurons. Two are located in the cerebral ganglion, the other in the left pedal ganglion. The present findings suggest the presence of a system of neurons that contain CDCH or CDCH-like peptides. The role this system may play in the control of egg-laying and egg-laying behaviour is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00215857
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  • 3
    Electronic Resource
    Electronic Resource
    Manipulation of tuber-size distribution of a potato crop (1990)
    Springer
    Potato research 33 (1990), S. 417-432 
    Details
    ISSN: 1871-4528
    Keywords: stolonization ; tuberization ; tuber bulking ; size grade ; stem number ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Tuber-size distribution is regulated by many diverse, interacting mechanisms and is therefore difficult to understand and manipulate. It is determined by plant density, number of stems per plant, number of tubers per stem, and yield. Seed size and plant number per unit area are easy to control, but stem number is affected by less controllable factors. Interactions between stems of different types are important for tuber-size distribution. The hormonal regulation of stolonization and tuberization is still unknown, but under the conditions of north-west Europe the process of tuber set (which is also poorly understood) makes a greater contribution to the final number of tubers than tuberization. The total yield is also relevant, because it affects both the average tuber size and its variation. Tubers on the same stem differ in timing, rate and duration of growth. The resulting hierarchy in sink strength is not consistent over time. Several mechanisms are suggested for this hierarchy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358019
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  • 4
    Electronic Resource
    Electronic Resource
    Possible mechanisms of size hierarchy among tubers on one stem of a potato (Solanum tuberosum L.) plant (1991)
    Springer
    Potato research 34 (1991), S. 187-203 
    Details
    ISSN: 1871-4528
    Keywords: size grade ; tuberization ; tuber bulking ; tuber-size distribution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The tubers on one potato stem vary greatly in size and their size distribution may be described by their number and their average size and its variation. These components are mutually and closely related. The variation is partly caused by stolon characteristics, including their date of initiation, position and size. Tuber size is therefore partly determined before tuberization. Tuber-specific factors, such as the position and activity of the tuber initial also play a role, but the date of initiation of an individual tuber is not crucial. Later on, during tuber bulking, the activity of enzymes involved in starch metabolism, the levels of hormones, the mineral composition and the turgor potential are associated with the tuber growth rate. The growth characteristics of individual tubers may also vary since they are exposed to different conditions because of differences in position or growing period.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358041
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  • 5
    Electronic Resource
    Electronic Resource
    X-ray-induced Metal Reduction in Polymer Hosts (1997)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 25 (1997), S. 46-49 
    Details
    ISSN: 0142-2421
    Keywords: XPS ; x-ray-induced metal reduction ; metal-containing polymer ; PdCl2 ; polyvinylpyrrolidone ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: We report the rapid modification of the palladium 3d photoelectron spectrum obtained from a mixed PdCl2/PVP (polyvinylpyrrolidone) film on glass. Chemical transformation of up to one-third of the Pd is observed under XPS analysis conditions that are routinely used for swift survey scans. The alterations can be assigned uniquely to the combination of this x-ray-insensitive metal salt and its polymer host. If this finding can be generalized to other inorganics in or on organic matrices, it has severe implications for the alleged non-destructiveness of XPS surface analysis when addressing certain problems in this technologically increasingly important class of material combinations. © 1997 by John Wiley & Sons, Ltd.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Bifunktionelle und cyclische Organomagnesiumverbindungen, II1) 1-Oxa-5-magnesiacyclooctan (1972)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 763 (1972), S. 148-154 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Bifunctional and Cyclic Organomagnesium Compounds, II. - 1-Oxa-5-magnesiacyclooctaneFrom association measurements it is concluded that the di-Grignard compound 1 formed from 3,3′-dibromodi-n-propyl ether (3) in tetrahydrofuran completely disproportionates to monomeric 1-oxa-5-magnesiacyclooctane (2) and magnesium bromide. The preference for 2 is ascribed to intramolecular coordination between magnesium and oxygen. At higher temperatures 2 decomposes to cyclopropane and trimeric 1-oxa-2-magnesiacyclopentane (6a).
    Notes: Durch Assoziationsmessungen wird festgestellt, daß die aus 3.3′-Dibrom-di-n-propyläther (3) erhältliche Di-Grignard-Verbindung 1 in Tetrahydrofuran vollständig zu monomerem 1-Oxa-5-magnesiacyclooctan (2) und Magnesiumbromid disproportioniert. Die Bevorzugung von 2 wird auf intramolekulare Koordination zwischen Magnesium und Sauerstoff zurückgeführt. Bei höherer Temperatur zersetzt sich 2 zu Cyclopropan und trimerem 1-Oxa-2-magnesiacyclopentan (6a).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.19727630116
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  • 7
    Electronic Resource
    Electronic Resource
    Investigation of MMT adsorption on soils by Diffuse Reflectance Infrared Spectroscopy (DRIFTS) and Headspace Analysis Gas-phase Infrared Spectroscopy (HAGIS) (1998)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 12 (1998), S. 121-128 
    Details
    ISSN: 0268-2605
    Keywords: MMT ; soils ; interactions ; Fourier-transform IR ; Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Diffuse reflectance infrared Fourier-transform spectroscopy (DRIFTS) and headspace analysis gas-phase infrared spectroscopy (HAGIS) were used to investigate interactions between soils and the gasoline additive methylcyclopentadienylmanganese tricarbonyl (MMT). Various soil samples, as well as alumina and silica substrates, were studied. Each substrate exhibited a splitting or broadening of the degenerate e ν(CO) band of MMT, suggesting an interaction involving one or two of the CO ligands. The adsorption was shown to be reversible under relatively mild conditions using HAGIS. The proposed interaction is of the Brønsted type, involving the carbonyl oxygen and a surface-bound water or hydroxyl group. This type of interaction could stabilize MMT by inhibiting photo-ejection of CO ligands, a common first step in the decomposition of organometallic carbonyl compounds such as MMT. © 1998 John Wiley & Sons, Ltd.
    Additional Material: 5 Ill.
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