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Sirvi Autor "Nurme, Karin" järgi

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  • Pisipilt
    Kirje
    Encoding of environmental heat by the sensory triad of insects antennal thermo- and hygroreceptor neurons
    (Eesti Maaülikool, 2019) Nurme, Karin; Merivee, Enno (advisor); Must, Anne (advisor); Sibul, Ivar (advisor); Kleineidam, Christoph (opponent)
    Despite that environmental thermal conditions play a major role in all levels of biological organization very little information is available on noxious high temperature sensation crucial in behavioural thermoregulation and survival of small ectothermic animals such as insects. Scarcely anything is known about encoding of noxious high temperatures by peripheral thermoreceptor neurons. In this thesis, using a novel focused ion beam scanning electron microscopy combined technique, it was demonstrated that in economically important carabid and elaterid beetles, thermo- and hygroreceptor neurons are located in antennal dome-shape sensilla (DSS) morphologically distinct from all known types of sensilla of other insects. They are innervated by the classical sensory triad of a cold neuron and two antagonistically responding hygroreceptor neurons, the moist air and and the dry air neuron, respectively. Using extracellular single sensillum recording in the range of 20 to 45 °C it was shown that at temperatures above 25 (30) °C, firing mode of the DSSs neurons changes. They switch from regular spiking to spike bursting. Several parameters of the bursts of all the three neurons are temperature dependent and may hierarchically encode noxious heat up to lethal levels in a graded manner. According to their reaction type and response modality, the three DSS neurons were reclassified as the cold-hot neuron, the moist-hot neuron and the dry-hot neuron, respectively. The possible involvement of spike bursting in behavioural thermoregulation of the beetles is discussed. These findings consider spike bursting as general, fundamental quality of the classical sensory triad of insect antennal thermo- and hygro-thermoreceptor neurons being a flexible and reliable mode of coding unfavourably high temperatures.
  • Pisipilt
    Kirje
    Põllumajanduslik entomoloogia : Õpik kõrgkoolidele
    (Eesti Maaülikool, 2024) Metspalu, Luule; Kruus, Eha; Kaasik, Riina; Mürk, Anne; Nurme, Karin; Mänd, Marika; Veromann, Eve; Karise, Reet; Ploomi, Angela; Raimets, Risto; Merivee, Enno; Jõgar, Katrin; Eesti Maaülikool. Põllumajandus- ja keskkonnainstituut. Taimetervise õppetool
    Sissevaade põllumajandusputukate kirevasse maailma.