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  • 1
    Electronic Resource
    Electronic Resource
    Surface structures and electronic states of H2S-treated InP(001) (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 4193-4196 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We find two different surface structures, (1×2) and (1×1), for H2S-treated InP(001). They depend upon exposure of H2S at about 350 °C. The coverage of sulfur is estimated to be about a half monolayer and one full monolayer for the (1×2) and (1×1) structures, respectively. The (1×1) structure is reconstructed to the (1×2) structure upon annealing at about 550 °C. It is suggested that sulfur is bonded to only In atoms and substitutes some of the phosphorus atoms below the first layer. Inverse photoemission spectra show strong reduction in intensity of 1.2 eV peak above the Fermi level for a clean InP(001)-(4×2) surface upon adsorption of H2S. This reduction implies a decrease in unoccupied surface states due to dangling bonds of indium dimers on the clean surface. The result of adsorption of oxygen on the (1×2) and (1×1) surfaces indicates significant passivation to oxidation of the surfaces. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362660
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  • 2
    Electronic Resource
    Electronic Resource
    LOSS OF HLA-A,B,C IN COLORECTAL CARCINOMA IS RELATED TO THE DEGREE OF DE-DIFFERENTIATION (1986)
    Oxford, UK : Blackwell Publishing Ltd
    International journal of immunogenetics 13 (1986), S. 0 
    Details
    ISSN: 1744-313X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: By means of immunoperoxidase staining of frozen sections 100 primary colorectal carcinomas and 19 metastases were studied for the expression of HLA-A,B,C antigens. A substantial number of the tumours showed a deficient class I expression. The loss of HLA-A,B,C correlated with the degree of de-differentiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1744-313X.1986.tb01101.x
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  • 3
    Electronic Resource
    Electronic Resource
    Basal expansion of anal-fin rays: a new osteological character in weakly discharging electric fish (Mormyridae) (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 49 (1996), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Bone expansion of anal-fin rays in mormyrid fish is introduced as a new osteological character to distinguish two mormyrid species, Brienomyrus brachyistius from Nigeria and Brienomyrus kingsleyae from Gabon. This character is sexually dimorphic and species-specific, affecting the bases of anal-fin rays in adult males only. Between the two species, it differed in degree, the number of rays involved, and the number of the first ray affected. These differences together with differences in conventional meristic and morphometric characters further support ongoing revisions of Brienomyrus taxonomy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1996.tb01790.x
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  • 4
    Electronic Resource
    Electronic Resource
    Temporal patterning of electric organ discharges in the African electric catfish, Malapterurus electricus (Gmelin) (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 40 (1992), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: This paper is the first detailed analysis of situation-specific temporal patterning of electric organ discharges (EODs) in a strong electric fish. Using a resident-intruder paradigm EODs were recorded during interactions between dyads composed of Malapterurus electricus (Gmelin) and four different types of fish: (1) conspecifics; (2) large prey-type mid-water fish, goldfish (Carassius auratus, Linnaeus 1758) and tilapia (Oreochromis melanotheron, Rüppel, 1852); (3) a sympatric competitor, Polypterus palmas (Ayres 1850) and (4) a larger, threatening catfish, Clarias sp.An analysis of the EODs emitted showed that in the presence of conspecifics the average EOD volley consisted of a single long-duration, low frequency train of EODs. The presence of the midwater fish (goldfish and Tilapia) elicited volleys consisting of two short trains, and P. palmas elicited long duration volleys with two trains and long inter-train intervals. Finally, an attacking Clarias resulted on average in volleys consisting of two high-frequency trains of EODs. With nonconspecific partner species resident electric catfish emitted volleys with more pulses, more trains that were longer in duration and higher in frequency than the EODs in volleys emitted by intruder electric catfish with the same species stimulus fish.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1992.tb02553.x
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  • 5
    Electronic Resource
    Electronic Resource
    Revision of the Arctic cod genus Arctogadus (2003)
    Oxford, UK : Blackwell Science Ltd
    Journal of fish biology 62 (2003), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Examination of 200 specimens (54–477 mm LS) of the high Arctic cod genus Arctogadus showed that A. borisovi should be considered a junior synonym of A. glacialis. The most important specific characters hitherto used, i.e. length of barbel, interorbital width, horizontal diameter of eye and number of rakers on the anterior gill arch, were shown to be strongly affected by allometric change and were not of specific diagnostic value. A redescription of A. glacialis is given with new information on its biology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1095-8649.2003.00115.x
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  • 6
    Electronic Resource
    Electronic Resource
    Restoration of the taxon Lycodes marisalbi, with notes on its disjunct Arctic distribution (2000)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 57 (2000), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Examination of a large number of Lycodes specimens from the Arctic Ocean showed that western Canadian Arctic (Beaufort Sea) specimens, hitherto identified as Lycodes pallidus Collett, 1878 are identical with Lycodes marisalbi Knipovich, 1906 from the White Sea. Both populations have a ventro-medio-lateral lateral line system, not in accordance with the ventral and posterior medio-lateral type of lateral line found in L. pallidus. Lycodes marisalbi, which has been regarded as a subspecies of L. pallidus since 1954, is hence restored as a valid taxon. A revised diagnosis, description and synonymy are given. The extended distribution range of L. marisalbi is probably disjunct (White Sea and Beaufort Sea), indicating a biogeographic pattern characterized by affinity to relatively shallow water with reduced salinity. Specimens from Franklin Bay (Beaufort Sea) with light vertical bars, previously assigned to Lycodes sagittarius McAllister, 1975 are here assigned to L. marisalbi, restricting L. sagittarius to include uniformly brown specimens only.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.2000.tb02220.x
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  • 7
    Electronic Resource
    Electronic Resource
    Spectral sensitivity of the weakly discharging electric fish Gnathonemus petersi using its electric organ discharges as the response measure (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 50 (1997), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The spectral sensitivity of the weakly electric mormyrid fish Gnathonemus petersi was investigated under dark- and light-adapted conditions using a transient change (startle) in its electric organ discharge (EOD) rate as response measure. The startle was resistant to habituation and graded with light intensity. Under both lighting conditions, the fish responded optimally to a monochromatic light of 525 nm. A porphyropsin pigment (520–5402) appears to mediate spectral sensitivity over most of the visible spectrum. However, G. petersi responded more strongly to 625- and 675-nm lights (dark- and light-adapted fish) and a 725-nm light (light-adapted fish only) than predicted by the presence of a single rod pigment. These data suggest that at least one additional visual pigment (most likely of cone cells) maximally absorbing long wavelength light (600 nm or longer) is present. The spectral sensitivity data are consistent with the sensitivity hypothesis in that heightened sensitivity to long wavelength light is predicted for fish living in blackwater habitats which are characterized typically by low light levels and transmission of predominantly long wavelengths. Histology of the retina showed photoreceptors grouped into bundles and ensheathed by pigment epithelial cells. Our results demonstrated a functional visual sense in a species of fish much better known and studied for its electrosensory and electromotor abilities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1997.tb01631.x
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  • 8
    Electronic Resource
    Electronic Resource
    The anal fin complex in a weakly discharging electric fish, Gnathonemus petersii(Mormyridae) (2005)
    Oxford, UK; Malden, USA : Blackwell Publishing Ltd/Inc.
    Journal of fish biology 66 (2005), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: An examination of the permanent bony structures of the anal fin complex in the mormyrid fish, Gnathonemus petersii, revealed two new structural sexual dimorphisms: longer proximal pterygiophores and wider anal fin rays in males than in females. Both structures are thought to facilitate the male’s courtship-associated anal fin reflex. Adult male mormyrid fishes are characterized by a dorsally directed indentation of the posterior body wall (anal fin indentation). The expression of this indentation in males, presumably driven by anal fin musculature, was correlated with the fish’s gonadal state: large indentations were associated with high gonado-somatic indices and small indentations with low indices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.0022-1112.2005.00608.x
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  • 9
    Electronic Resource
    Electronic Resource
    A sexually dimorphic basal anal-fin ray expansion in the weakly discharging electric fish Gnathonemus petersii (1998)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 53 (1998), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Male Gnathonemus petersii (Mormyridae) exhibit two structural, sexually dimorphic characters: anal-fin ray bone expansion and an indentation of the posterior ventral body wall (formerly described as anal-fin indentation). Females lack this bone expansion, but may show a slight indentation. Morphometric data on both characters were obtained from radiographs of 414 fish (males and females) ranging in size from 60 to 276 mm Ls. Both body wall indentation and bone expansion began to develop in males of about 120 mm Ls. At 160–180 mm, the sex ratio of fish with expansion to fish without expansion was 50 : 50. Androgens seem to affect the expression of both these sexual dimorphisms. Bone expansion may provide increased bone surface for muscle attachment and thus facilitate the anal-fin reflex during courtship behaviour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1998.tb01007.x
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  • 10
    Electronic Resource
    Electronic Resource
    Micellar Electrokinetic Capillary Chromatography for Determination of Indolyl Glucosinolates and Transformation Products Thereof
    Amsterdam : Elsevier
    Analytical Biochemistry 217 (1994), S. 62-69 
    Details
    ISSN: 0003-2697
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1006/abio.1994.1083
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