Publications by authors named "Tomonori Sasaki"
Article Synopsis
- - Numerous studies have looked at how pesticides enter insects, focusing on methods like oral ingestion, skin absorption, and inhalation, but there's limited understanding of how these chemicals spread on the insect's surface to reach their entry points.
- - The research utilized advanced techniques such as NanoSuit and X-ray spectroscopy to track pesticide-like substances on the German cockroach and analyze their movement across different body surfaces.
- - Results showed that when pesticides adhered to certain areas, they spread in specific directions influenced by the insect's body structure, highlighting how morphological features and surface chemistry impact the capillary forces that dictate pesticide distribution.
Unlabelled: The expression spectra of connexin (Cx) isoforms were investigated in three mouse melanoma cell lines: B16-F1 (F1), B16-F10 (F10), and B16-BL6 (BL6). Metastatic potential intensity was higher in the order of F1, F10, and BL6. A remarkable behavior of was found among 20 isoforms.
View Article and Find Full Text PDFWe report comprehensive evidence for obligatory thelytokous parthenogenesis in an ant Monomorium triviale. This species is characterized by distinct queen-worker dimorphism with strict reproductive division of labor: queens produce both workers and new queens without mating, whereas workers are completely sterile. We collected 333 nests of this species from 14 localities and three laboratory-reared populations in Japan.
View Article and Find Full Text PDFIn insects, the voltage-gated sodium channel (VGSC) is the primary target site of pyrethroid insecticides. Various amino acid substitutions in the VGSC protein, which are selected under insecticide pressure, are known to confer insecticide resistance. In the genome, the VGSC gene consists of more than 30 exons sparsely distributed across a large genomic region, which often exceeds 100 kbp.
View Article and Find Full Text PDFCooperation is subject to cheating strategies that exploit the benefits of cooperation without paying the fair costs, and it has been a major goal of evolutionary biology to explain the origin and maintenance of cooperation against such cheaters. Here, we report that cheater genotypes indeed coexist in field colonies of a social insect, the parthenogenetic ant Pristomyrmex punctatus. The life history of this species is exceptional, in that there is no reproductive division of labour: all females fulfil both reproduction and cooperative tasks.
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