| hypocalcemic potency of the ultimobranchial gland in some urodelan amphibians. | the hypocalcemic potencies of the ultimobranchial glands of two urodelans, onychodactylus japonicus and hynobius nigrescens, were studied; according to the rat bioassay, their calcitonin values (mrc) were 30 and 18 mu/kg body wt, respectively. various organs other than the ultimobranchial gland were also assayed in rats to see whether they had any hypocalcemic potency. however, the ultimobranchial gland was the only organ examined with detectable hypocalcemic potencies in these urodelans. the hy ... | 1983 | 6618158 |
| cellular localization of a putative na(+)/h (+) exchanger 3 during ontogeny in the pronephros and mesonephros of the japanese black salamander (hynobius nigrescens stejneger). | the cloning of cdna and an examination of the tissue distribution of na(+)/h(+) exchanger 3 (nhe3) were carried out in the japanese black salamander, hynobius nigrescens. the cellular localization of hynobius nhe3 was examined by in situ hybridization and immunohistochemistry during ontogeny in the nephron of the pronephros and mesonephros of the salamander. the partial amino acid sequence of hynobius nhe3 was 81% and 72% identical to rat nhe3 and stingray nhe3, respectively. hynobius nhe3 mrna ... | 2008 | 18071752 |
| ontogeny of enac expression in the gills and the kidneys of the japanese black salamander (hynobius nigrescens stejneger). | a full-length cdna cloning and tissue distribution of epithelial sodium channel (enac) protein were studied during ontogeny by immunohistochemistry in the external gills, and the kidney, pronephros and mesonephros, of the japanese black salamander, hynobius nigrescens (family hynobiidae; a primitive caudate species). the amino acid sequence of hynobius enacα is 64 and 63% identical to bufo enacα and rat enacα, respectively. in aquatic larva salamander at the digit differentiation stage, hynobius ... | 2010 | 21328529 |
| CXCL14-like immunoreactivity in growth hormone-containing cells of urodele pituitaries. | Immunohistochemical techniques were employed to investigate the distribution of a chemokine, namely, CXCL14-like immunoreactivity in the axolotl (Ambystoma mexicanum) and Japanese black salamander (Hynobius nigrescens) pituitaries. CXCL14-immunoreactive cells concentrated at an area of the pars distalis adjacent to the pars intermedia. We found that these cells correspond to the cells immunoreactive to an antibody against rat growth hormone (GH). Immunoelectron microscopy indicated that the CXCL ... | 2011 | 22119756 |
| locomotion pattern and trunk musculoskeletal architecture among urodela. | we comparatively examined the trunk musculature and prezygapophyseal angle of mid-trunk vertebra in eight urodele species with different locomotive modes (aquatic siren intermedia, amphiuma tridactylum, necturus maculosus and andrias japonicus; semi-aquatic cynops pyrrhogaster, cynops ensicauda; and terrestrial hynobius nigrescens, hynobius lichenatus and ambystoma tigrinum). we found that the more terrestrial species were characterized by larger dorsal and abdominal muscle weight ratios compare ... | 2015 | 25914411 |
| functional and morphological variety in trunk muscles of urodela. | trunk musculature in urodela species varies by habitat. in this study, trunk musculature was examined in five species of adult salamanders representing three different habitats: aquatic species, amphiuma tridactylum and necturus maculosus; semi-aquatic species, cynops pyrrhogaster; terrestrial species, hynobius nigrescens and ambystoma tigrinum. more terrestrial species have heavier dorsal and ventral trunk muscles than more aquatic forms. by contrast, the lateral hypaxial musculature was strong ... | 2014 | 24065082 |
| ontogenetic changes of trunk muscle structure in the japanese black salamander (hynobius nigrescens). | we investigated ontogenetic changes in the trunk muscles of the japanese black salamander (hynobius nigrescens) before, during and after metamorphosis. given that amphibians change their locomotive patterns with metamorphosis, we hypothesized that they may also change the structure of their trunk muscles. the trunk muscles were macroscopically observed, and the weight ratios of each trunk muscle group were quantified at six different developmental stages. immediately after hatching, we found tha ... | 2015 | 25816856 |
| immunohistological classification of ionocytes in the external gills of larval japanese black salamander, hynobius nigrescens stejneger. | in this cytological and immunohistological study, we clarified the localization of the membrane transporters na(+) , k(+) -atpase (nka), vacuolar-type h(+) -atpase (vha), and epithelial sodium channel (enac) and distinguished ionocyte subtypes in the gill of the japanese salamander (hynobius nigrescens). in larvae (iy stages 43-65), nka immunoreactivity was observed on the basolateral plasma membrane in more than 60% cells and less than 20% cells in the primary filaments and secondary lamellae o ... | 2011 | 21598292 |
| draft genome sequence of mycobacterium montefiorense isolated from japanese black salamander (hynobius nigrescens). | mycobacterium montefiorense is a member of the mycobacterium simiae complex, the largest group of nontuberculous mycobacteria. here, we report the genome sequence of m. montefiorense isolate bs, isolated from diseased japanese black salamander (hynobius nigrescens) reared in an aquarium in japan. this is the first reported case of an m. montefiorense infection in an amphibian. | 2018 | 29798927 |
| seasonal changes in plasma concentrations of sex steroids in the salamander hynobius nigrescens. | changes in plasma concentrations of androgens, estradiol-17 beta, and progesterone were examined throughout the year in hynobius nigrescens. the highest mean concentration of androgens (312.7 ng/ml) was found in males in the process of spermiation and having just entered the breeding pond in early spring. plasma estradiol-17 beta concentration was at its base level in females both before and after the animals had entered the pond. plasma progesterone concentrations were low throughout the year e ... | 1993 | 8504922 |
| histochemistry of acetylcholine receptors and acetylcholinesterase during the formation of neuromuscular junctions in the urodele hynobius nigrescens. | the development and structure of neuromuscular junctions (n-m-js) in stylopodia of forelimbs of larvae and adults of hynobius nigrescens were histochemically investigated for acetylcholine receptors (achrs) and acetylcholinesterase (ache) activity. in larvae, the tetramethyl rhodamine-labelled α-bungarotoxin (tmr-αbt) positive areas appeared either as small fluorescent spots or fluorescent plates of various sizes. the mature fluorescent plate was found to be formed by the successive addition of ... | 1991 | 29865493 |
| cytogenetic studies of hynobiidae (urodela). iv. dna replication bands (r-banding) in the genus hynobius and the banding karyotype of hynobius nigrescens stejneger. | the r-banding technique of dutrillaux et al. (1973) was modified in order to analyze the chromosomes of salamanders in the genus hynobius. embryonic cells of hynobius nigrescens stejneger from nakakubiki county, niigata prefecture, and hakui county, ishikawa prefecture, were cultured in medium containing 5-bromodeoxyuridine (brdu). banded metaphases were obtained by the fpg (fluorescent-plus-giemsa) technique (perry and wolff, 1974), with slight modifications. with this modified r-banding techni ... | 1986 | 3780314 |