Publications by authors named "P V Velansky"
The ribbon worms of the closely related species , cf. , and , representing the species complex, possess high concentrations of tetrodotoxin (TTX) and its analogues in all developmental stages from eggs to adults. It has recently been suggested that the eggs and larvae of these animals can be a source of tetrodotoxins (TTXs) for other aquatic organisms.
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- First-time detection of TTX and 11 related toxins in Cephalothrix mokievskii using advanced HPLC-MS/MS technology.
- Notable differences in the TTX toxin profiles were found between Cephalothrix mokievskii and its similar species, Cephalothrix cf. simula.
- The study highlights the geographical distribution of TTX-containing nemerteans and discusses potential impacts on marine ecosystems.
A Gram-negative, aerobic, rod-shaped, non-motile, yellow-pigmented bacterium, KMM 9835, was isolated from the sediment sample obtained from the Amur Bay of the Sea of Japan seashore, Russia. Phylogenetic analyses based on the 16S rRNA gene and whole genome sequences positioned the novel strain KMM 9835 in the genus as a separate line sharing the highest 16S rRNA gene sequence similarities of 96.6% and 96.
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- Nemerteans, also known as ribbon worms, contain tetrodotoxin (TTXs) and its analogues, which are neurotoxins likely used for hunting and protection.
- The study analyzed two closely related nemertean species to investigate the distribution and concentration of TTXs in different body parts using advanced techniques like HPLC-MS/MS and fluorescence microscopy.
- Six types of TTXs-positive cells were identified across both species, with differing concentrations of toxins in various body regions, highlighting unique physiological functions of newly discovered glandular cell types in the intestine.
The Agrobacterium rhizogenes root oncogenic locus (rol) genes interfere with hormone balance by altering their synthesis and/or recognition, giving rise to varied impacts on the physiological characteristics of plants and cell cultures. The homolog of the rolB and rolC genes from Ipomoea batatas, named Ib-rolB/C, similarly induces morphological and physiological alterations in transgenic Arabidopsis thaliana; however, its role in plant hormonal homeostasis has not been previously defined. In this study, we found that external application of salicylic acid (SA) and methyl jasmonate (MeJA) significantly upregulated Ib-rolB/C in detached I.
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