Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Structural and optical characterization of epitaxial waveguiding BaTiO3 thin films on MgO (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 3305-3310 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Epitaxial waveguide structures of c-axis oriented BaTiO3 thin films on MgO(001) have been grown by pulsed laser deposition. The structural properties of the samples have been characterized by Rutherford backscattering spectrometry/ion channeling (RBS/C), x-ray diffraction, and atomic force microscopy. We found excellent crystalline quality even up to thicknesses of a few microns. This has been confirmed by RBS/C minimum yield values of 2%–3%, a full width at half maximum of 0.36° of the BaTiO3 (002) rocking curve, and a rms roughness of 1.1 nm for a 950 nm BaTiO3 film. The out-of-plane refractive index was measured to be close to the extraordinary bulk value with the birefringence being about one third of the bulk value. Waveguide losses of 2.9 dB/cm have been demonstrated. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367099
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    The physiology of an olfactory sensillum of the termite Schedorhinotermes lamanianus: carbon dioxide as a modulator of olfactory sensitivity (1996)
    Springer
    Journal of comparative physiology 179 (1996), S. 123-133 
    Details
    ISSN: 1432-1351
    Keywords: Isoptera ; Olfaction ; Electrophysiology ; Response spectra ; Mixture interaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract There are three morphological types of wall-pore single-walled sensilla on the antennae of Schedorhinotermes lamanianus workers. Among these, the sensilla of the type SW1 always bear two neurons that are distinguishable by their impulse amplitudes in electrophysiological recordings. Both neurons are odour-sensitive and respond with excitation to an equally narrow and strikingly congruent spectrum of odours. 1-Pentanol, 1-hexanol and 2-hexanol cause maximum excitation in both cells. In addition one cell responds to CO2. Short pulses of CO2 up to 3 s duration inhibit this cell totally. The duration of total inhibition increases with the logarithm of the CO2-concentration between 0.06% and 100%. Pulses of CO2 with concentrations above 0.15% cause an inhibition that lasts longer than the period of stimulation. Prolonged CO2 -stimuli (〉 300 s) with a concentration between 0.5% and 5% CO2 initially cause total inhibition. However, after 1 to 5 min, activity reappears and reaches a new constant but dose-dependent frequency. None of the stimulatory odours leads to a response in the cell when applied together with CO2. The sensitivity to odours of this one cell type is “switched off” by CO2, whilst CO2 does not influence the other neuron in the same sensillum. The CO2-concentration, (high in the centres of termite nests, low outside the nests) may give important information about the context in which an individual receives a signal. The described modulation of odoursensitivity by CO2 allows the presentation of two hypothetical mechanisms of context-dependent signal interpretation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00193440
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Autodetection and chemistry of female and male pheromone in both sexes of the tiger moth Panaxia quadripunctaria (1998)
    Springer
    Journal of comparative physiology 182 (1998), S. 153-161 
    Details
    ISSN: 1432-1351
    Keywords: Key words Arctiidae ; Pheromones ; Autodetection ; Hydroxydanaidal ; Danaidal
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Female moths of Panaxia quadripunctaria PODA (Lepidoptera, Arctiidae), produce (Z,Z)-6,9-heneicosadiene (I) as the major and (Z,Z)-6,9-eicosadiene (II) as the minor component of a putative pheromone. Related compounds occur in trace amounts. The abdominal scent glands contain 5–10 μg of (I) and 50–100 ng of (II). Recordings of electroantennogram (EAG) responses to (I), (II), and to female glands are of equal amplitude in both sexes. Females are thus capable of pheromone autodetection in contrast to the majority of moths where females are considered to be anosmic for their own attractant. The EAG threshold to (I) was below 1 ng at the odour source. The odour of the male scent gland (corema) elicited significant EAGs in both sexes. The chemical contents of coremata varied with the provenience of the moths. A variety of ethyl esters was always found, yet hydroxydanaidal (up to 20 μg/corema) and traces of danaidal, only in some samples. All these scents might be components of a male pheromone. Peculiar scent scales on the coremata are exposed during the extrusion. Antennae of both sexes have similar inventories of trichoid sensilla.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003590050166
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    The labial gland in the termiteSchedorhinotermes lamanianus (Isoptera: Rhinotermitidae): Morphology and function during communal food exploitation (1992)
    Springer
    Insectes sociaux 39 (1992), S. 373-384 
    Details
    ISSN: 1420-9098
    Keywords: Polymorphism ; exocrine secretion ; aggregation pheromone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary InSchedorhinotermes lamanianus, size and cellular differentiation of the labial gland exhibit a caste-specific polymorphism. The acini of workers are composed of three distinct types of secretory cells, one of which is absent in soldiers and alates. The labial gland of workers releases a chemical signal for intraspecific communication. During the communal exploitation of a food source, labial gland secretion makes workers aggregate at gnawing sites where this signal is deposited. A newly developed bioassay is demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01240622
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Perception of Oviposition-Deterring Pheromone by Cabbage Seed Weevil (Ceutorhynchus assimilis) (1999)
    Springer
    Journal of chemical ecology 25 (1999), S. 1655-1670 
    Details
    ISSN: 1573-1561
    Keywords: Oviposition-deterring pheromone ; host marking pheromone ; marker ; electrophysiology ; contact chemoreception ; gustatory sensilla ; antenna ; behavior ; Ceutorhynchus assimilis ; Coleoptera ; Curculionidae ; Brassica napus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Following oviposition into a pod of oilseed rape (Brassica napus), the female cabbage seed weevil (Ceutorhynchus assimilis) marks the pod with oviposition-deterring pheromone (ODP) by brushing it with her eighth abdominal tergite. On an unmarked pod, oviposition site selection was always accompanied by intensive antennation of the pod. Females approaching a freshly ODP-marked pod brought their antennae within 1 mm of the pod but usually did not antennate it before rejecting it for oviposition. Females with the clubs of their antennae amputated continued to discriminate pods from stems or petioles as oviposition sites but showed no behavioral response to ODP. Extracts of volatiles air-entrained from ovipositing weevils failed to inhibit oviposition. Air passed over a behaviorally active extract of ODP did not elicit a detectable electroantennogram response. By contrast, when presented as a gustatory stimulus to the sensilla chaetica of the antennal club, a behaviorally active extract of ODP from postdiapause, gravid females elicited a strong electrophysiological response. This response usually involved more than one cell and displayed a phasic–tonic time course over the recording period of 10 sec. Extract from prediapause (and hence sexually immature) females elicited neither behavioral nor electrophysiological (contact) responses. Thus the ODP of the cabbage seed weevil is sensed primarily by contact chemoreception at the sensilla chaetica of the antennae, and the electrophysiological responses recorded from these gustatory sensilla are of value as the basis of a bioassay to assist identification of the active constituent(s) of the pheromone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1020801319251
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...