Changes in tetrodotoxin (TTX) content of the puffer fish Takifugu rubripes during seed production were examined. Two mature female puffer fish T. rubripes (samples 1 and 2) that contained TTX were used. The toxic eggs were artificially fertilized, and hatchlings were reared in an indoor tank for 50 days and then in a netcage at sea for an additional 48 or 38 days. The TTX content of the fertili...

Tetrodotoxin (TTX) was intramuscularly administered to artificially hybridized specimens of the pufferfish Takifugu rubripes and Takifugu niphobles to investigate toxin accumulation in hybrids, and TTX transfer/accumulation profiles in the pufferfish body. In the test fish administered 146 MU TTX in physiologic saline, TTX rapidly transferred from the muscle via the blood to other organs. Toxin...

Tetrodotoxin (TTX) was intramuscularly administered to non-toxic cultured specimens of the pufferfish Takifugu rubripes to investigate TTX transfer/accumulation profiles in the pufferfish body. In two groups of test fish administered either 50MU/individual of TTX standard (purified TTX; PTTX) or crude extract of toxic pufferfish ovary (crude TTX; CTTX), TTX rapidly transferred from the muscle v...

The kidney of marine teleosts is the major site of Mg(2+) excretion and produces urine with a high Mg(2+) concentration. However, the transporters involved in Mg(2+) excretion are poorly understood. The cyclin M (Cnnm; also known as ancient conserved domain protein) family comprises membrane proteins homologous to the bacterial Mg(2+) and Co(2+) efflux protein, CorC. To understand the molecular...

Infectious prion proteins cause neurodegenerative disease in mammals owing to the acquisition of an aberrant conformation. We cloned a Fugu rubripes gene that encodes a structurally conserved prion protein, and found rapid rates of molecular divergence among prions from different vertebrate classes, along with molecular stasis within each class. We propose that a directional trend in the evolut...

日本水産学会誌第88巻4号（July 2022）294-299頁「トラフグTakifugu rubripes成熟個体におけるテトロドトキシン蓄積の雌雄差」に誤りがありましたので，訂正いたします。

The tiger pufferfish (fugu), Takifugu rubripes, is a model fish that has had its genome entirely sequenced. By performing genomewide linkage analyses, we show that the sex of fugu is determined by a single chromosomal region on linkage group 19 in an XX-XY system.

We examined 35 species of ground and epiphytic lichens, including fruticose, foliose, crustose lichen, as habitats oribatid mites. Observations were carried out in the taiga forests northeast European Russia, 87 from 38 families found. The Crotoniidae, Carabodidae, Oppiidae, Suctobelbidae are most numerous lichens Oribatulidae epiphytes. Micreremidae Licneremaeidae only noted A complex characte...

The second most abundant cation in seawater (SW), Mg²⁺, is present at concentrations of ~53 mM. Marine teleosts maintain plasma Mg²⁺ concentration at 1-2 mM by excreting Mg²⁺ into the urine. Urine Mg²⁺ concentrations of SW teleosts exceed 70 mM, most of which is secreted by the renal tubular epithelial cells. However, molecular mechanisms of the Mg²⁺ secretion have yet to be clarified. To ident...