Publications by authors named "T Kazawa"
Many insects, including ants, are known to respond visually to conspicuous objects. In this study, we compared orientation in an arena containing only a black target beacon as local information in six species of ants of widely varying degree of phylogenic relatedness, foraging strategy, and eye morphology (, , , , and two spp.), often found associated in similar urban anthropogenic habitats.
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- A 70-year-old man with a history of asthma and chronic sinusitis presented with severe symptoms including fever, limb numbness, blood in urine, and gastrointestinal bleeding, alongside abnormal blood results indicating eosinophilia and elevated IgG4 levels.
- Diagnostic procedures showed significant airway lesions and inflammation, leading to a diagnosis of eosinophilic granulomatosis with polyangiitis (EGPA), and the patient was initially treated with steroids, which improved his condition.
- However, after 18 months, the patient's symptoms and eosinophil levels worsened, prompting treatment with an anti-IL-5 antibody (mepolizumab), which successfully normalized his blood results and alleviated symptoms, highlighting the
The neuronal pathways involved in the processing of sex pheromone information were investigated in the hawkmoth Agrius convolvuli (Lepidoptera: Sphingidae), which uses (E,E)-11,13-hexadecadienal (E11,E13-16:Ald) as the single sex pheromone component. We first clarified the anatomical organization of the antennal lobe of A. convolvuli.
View Article and Find Full Text PDFAnimals need to discriminate differences in spatiotemporally distributed sensory signals in terms of quality as well as quantity for generating adaptive behavior. Olfactory signals characterized by odor identity and concentration are intermittently distributed in the environment. From these intervals of stimulation, animals process odorant concentration to localize partners or food sources.
View Article and Find Full Text PDFAlthough odorant concentration-response characteristics of olfactory neurons have been widely investigated in a variety of animal species, the effect of odorant concentration on neural processing at circuit level is still poorly understood. Using calcium imaging in the silkmoth (Bombyx mori) pheromone processing circuit of the antennal lobe (AL), we studied the effect of odorant concentration on second-order projection neuron (PN) responses. While PN calcium responses of dendrites showed monotonic increases with odorant concentration, calcium responses of somata showed decreased responses at higher odorant concentrations due to postsynaptic inhibition.
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