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  • Clusiaceae  (2)
  • Praying mantid  (2)
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  • 1
    Digitale Medien
    Digitale Medien
    Relationships between carbon and hydrogen isotope ratios and nitrogen levels in leaves ofClusia species and two other Clusiaceae genera at various sites and different altitudes in Venezuela (1996)
    Springer
    Trees 10 (1996), S. 351-358 
    Details
    ISSN: 1432-2285
    Schlagwort(e): Altitude ; Carbon isotope ratio ; Clusiaceae ; Crassulacean acid metabolism ; Deuterium
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract Samples of the Clusiaceae generaClusia, Oedematopus andDystovomita were collected at various sites and different altitudes in northern and south-western Venezuela. Analyses of stable isotopes of carbon and hydrogen and of leaf-nitrogen levels were performed on the dried samples. Correlations among these variables, i.e. carbon isotope discrimination (Δ), hydrogen isotope ratio (δD) and N-levels, and with altitude were assessed. In the samples, where values of Δ above 15‰ indicate predominant performance of C3 photosynthesis, there were slight tendencies of increasing Δ, δD and N-levels with increasing altitude and of increasing Δ with increasing N. Although these correlations taken separately were not statistically significant, they support each other and indicate increasing transpiration and increased leaf-nutrient supply at increasing altitude. Performance of crassulacean acid metabolism (CAM) in species ofClusia appears to be restricted to altitudes below 1500 m a.s.l. There was a significant negative correlation of Δ with altitude in the samples, where values of Δ below 10‰ indicated predominant performance of CAM. This suggests that phases II and IV of CAM are progressively suppressed towards the upper altitudinal limit of CAM inClusia in northern Venezuela. It is concluded that among the large number of environmental factors and combinations thereof, which determine the expression of CAM inClusia and trigger C3-CAM transitions in C3/CAM intermediate species, low availability of water is the most important.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02185638
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 2
    Digitale Medien
    Digitale Medien
    Relationships between carbon and hydrogen isotope ratios and nitrogen levels in leaves of Clusia species and two other Clusiaceae genera at various sites and different altitudes in Venezuela (1996)
    Springer
    Trees 10 (1996), S. 351-358 
    Details
    ISSN: 0931-1890
    Schlagwort(e): Key words Altitude ; Carbon isotope ratio ; Clusiaceae ; Crassulacean acid metabolism ; Deuterium
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract  Samples of the Clusiaceae genera Clusia, Oedematopus and Dystovomita were collected at various sites and different altitudes in northern and south-western Venezuela. Analyses of stable isotopes of carbon and hydrogen and of leaf-nitrogen levels were performed on the dried samples. Correlations among these variables, i. e. carbon isotope discrimination (Δ), hydrogen isotope ratio (δD) and N-levels, and with altitude were assessed. In the samples, where values of Δ above 15 ‰ indicate predominant performance of C3 photosynthesis, there were slight tendencies of increasing Δ, δD and N-levels with increasing altitude and of increasing Δ with increasing N. Although these correlations taken separately were not statistically significant, they support each other and indicate increasing transpiration and increased leaf-nutrient supply at increasing altitude. Performance of crassulacean acid metabolism (CAM) in species of Clusia appears to be restricted to altitudes below 1500 m a. s. l. There was a significant negative correlation of Δ with altitude in the samples, where values of Δ below 10 ‰ indicated predominant performance of CAM. This suggests that phases II and IV of CAM are progressively suppressed towards the upper altitudinal limit of CAM in Clusia in northern Venezuela. It is concluded that among the large number of environmental factors and combinations thereof, which determine the expression of CAM in Clusia and trigger C3-CAM transitions in C3/CAM intermediate species, low availability of water is the most important.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02185638
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 3
    Digitale Medien
    Digitale Medien
    The cercal receptor system of the praying mantid, Archimantis brunneriana Sauss. (1982)
    Springer
    Cell & tissue research 224 (1982), S. 55-70 
    Details
    ISSN: 1432-0878
    Schlagwort(e): Praying mantid ; Cerci ; Insect sensilla ; Trichoid sensilla ; Filiform sensilla ; Archimantis brunneriana
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The cerci of the praying mantid, Archimantis brunneriana Sauss., are paired segmented sensory organs located at the tip of the abdomen. Basally the cercal segments are slightly flattened dorso-ventrally and are fused to such a degree that it is difficult to distinguish them. Distally the segments become progressively more flattened laterally and their boundaries become more obvious. Two types of sensilla are present on the cerci, trichoid sensilla and filiform sensilla. Trichoid hairs are longest on the medial side of the cerci and toward the cercal base. On the proximal cercal segments they are grouped toward the middle of each segment while they are more uniformly distributed on the distal segments. Filiform sensilla are found at the distal end of each segment except the last and are most abundant on the middle segments of the cercus. Both the number of cercal segments and the number of sensilla are variable. Trichoid hairs are highly variable in appearance from short and stout to long and thin. They arise from a raised base, have a fluted shaft, and some have a pore at the tip. They are innervated by from one to five dendrites, one of which is always considerably larger than the others. Some of the dendrites continue out into the shaft of the hair. Filiform hairs have fluted shafts and are mounted in a flexible membrane within a cuticular ring in a depression. They are innervated by a single large sensory neuron, the dendrite of which passes across a flattened area on the inner wall of the lumen of the hair. The dendritic sheath forms the lining of the ecdysial canal and is therefore firmly attached to the hair. The dendrite is attached to the sheath by desmosomes distally and is penetrated by projections of the sheath more proximally. A fibrous cap surrounds the dendrite and may hold it in place relative to the hair. The cercal receptor system of Archimantis is compared to those of cockroaches and crickets.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00217266
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 4
    Digitale Medien
    Digitale Medien
    The cercal receptor system of the praying mantid, Archimantis brunneriana Sauss. (1982)
    Springer
    Cell & tissue research 224 (1982), S. 71-80 
    Details
    ISSN: 1432-0878
    Schlagwort(e): Praying mantid ; Cerci ; Filiform sensilla ; Archimantis brunneriana
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The bilaterally paired cereal nerves of Archimantis brunneriana Sauss. leave the terminal ganglion posteriorly and then turn dorsally through muscles at the rear of the abdomen to enter the cerci, where each splits into two branches; successive branchings occur further distally in each cercus. In the distal nerve branches large axons tend to be grouped together. The cereal nerves are heavily wrapped in glial sheaths. Cobalt backfills of the cercal nerve reveal a projection which enters the ganglion at approximately 30° to the midline and then turns parallel to it. Most of the projection remains ipsilateral but bundles of axons approach or cross the midline in 6–8 places. At the anterior end of the ganglion there are strong projections both laterally and medially. In the posterior half of the ganglion fibers run ventrally to surround two glomeruli and there is a dorsal projection in the anterior half of the ganglion. There is a strong projection anteriorly into the ventral nerve cord. The electrophysiological responses of single cercal receptors to pulses of wind were recorded in the cercal nerve or terminal ganglion. These receptors, presumed to innervate filiform hairs, were then filled with Lucifer Yellow. All had ipsilateral projections. Most receptors showed little adaptation to stimuli as long as 5 seconds.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00217267
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
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