| comparison of dna-repair synthesis, chromosome aberrations and induction of micronuclei in cultured human fibroblasts, chinese hamster ovary and central mudminnow (umbra limi) cells exposed to chemical mutagens. | in mammalian cells it has previously been observed that low dna-repair activity is correlated with high chromosome-aberration frequency. since fish cells typically express comparatively low amounts of dna repair, the chromosome aberration test holds potential as a sensitive fish genotoxicity assay. a comparison of in vitro dna-repair activity showed hf greater than cho greater than ul-h = ul-f following exposure to mnng and 4nqo. although peak chromosome-aberration frequency varied cho greater t ... | 1984 | 6541753 |
| x-ray-induced dicentric yields in lymphocytes of the teleost, umbra limi. | a microculture technique was applied to the study of lymphocytes of umbra limi, which have a low number of large meta- and submetacentric chromosomes (2n = 22). on the 5th day (90h) and later after initiation of culture at 20 degrees c, some cultures provided well spread metaphase chromosomes for analyses. after initiation, cultures were irradiated with 50, 100, 150 and 200 r of 200 kvp x-rays. the cultures were harvested on the 5th day, at which time all arrested metaphase chromosomes were in t ... | 1983 | 6828033 |
| [a description of a new species gyrodactylus moldovicus sp. n. (monogenea: gyrodactylidae) from the european mudminnow umbra krameri walbaum, 1792 from the lower dnester basin]. | gyrodactylus moldovicus sp. n. found on gills, body and in nasal cavities of the european mudminnow (umbra krameri) differs from g. slovacicus ergens, 1963 also living on the this host by bigger size of the body, anchors and marginal hooks; from g. cylindriformes mueller et van cleave, 1932 living on the american mudminnow umbra limi--by bigger size of the body; from g. limi wood et mizelle, 1957 also from u. limi--by the form of ventral and dorsal bars and form of marginal hooks. it differs fro ... | 2005 | 15810561 |
| systematic position and relationships of paracreptotrematina limi, based on partial sequences of 28s rrna and cytochrome c oxidase subunit 1 genes. | paracreptotrematina limi amin and myer, 1982 (trematoda), an intestinal fluke specific to the mudminnow, umbra limi, is conventionally classified within the papillose allocreadiidae. its unusual morphology (lack of identifiable vitellaria, large fully embryonated terminal eggs), assumptions of homology of its 2 atypical muscular oral 'papillae' (lobes) with those of the bunoderinae, and its unknown life cycle make this classification tenuous. previous phylogenetic analyses of the papillose alloc ... | 2006 | 16729708 |
| origins of variation in muscle cytochrome c oxidase activity within and between fish species. | mitochondrial content, central to aerobic metabolism, is thought to be controlled by a few transcriptional master regulators, including nuclear respiratory factor 1 (nrf-1), nrf-2 and peroxisome proliferator-activated receptor-γ coactivator-1α (pgc-1α). though well studied in mammals, the mechanisms by which these factors control mitochondrial content have been less studied in lower vertebrates. we evaluated the role of these transcriptional regulators in seasonal changes in white muscle cytochr ... | 2011 | 21562176 |
| chromosome aberrations in cultured central mudminnow heart cells and chinese hamster ovary cells exposed to polycyclic aromatic hydrocarbons and sediment extracts. | 1. genotoxicity experiments were conducted with cultured fish cells to determine if the high frequency of epidermal papillomas observed in lemon sole from sturgeon bank, where a sewage treatment plant discharges, could be correlated with contamination of the sediments with chemicals such as 3,4-benzopyrene. 2. the frequency of chromosome aberrations was measured in cultured umbra limi heart (u1-h) and chinese hamster ovary (cho) cells following exposure to the polycyclic aromatic hydrocarbons (p ... | 1988 | 2899015 |
| integrative taxonomy identifies a new species of phyllodistomum (digenea: gorgoderidae) from the twospot livebearer, heterandria bimaculata (teleostei: poeciliidae), in central veracruz, mexico. | phyllodistomum inecoli n. sp. is described from the twospot livebearer, heterandria bimaculata (teleostei: poeciliidae), collected in the río la antigua basin, veracruz, mexico. the new species is described and characterised by using a combination of morphology, scanning electron microscopy, and sequences of nuclear and mitochondrial genes. diagnostic characters of the new species of phyllodistomum include a genital pore opening at the level of the caecal bifurcation; oval vitellarium, situated ... | 2013 | 24022129 |
| [a metacercarial disease in the dogfish species umbra limi (teleostei) and a trematode infestation in a physa sp. (mollusca)]. | a metacercarial infestation is reported in canadian umbra limi and a mass infestation by trematodes in physa sp. from the same locality. trials made by using parasitised snails showed that both parasites are not of the same species. | 1984 | 6495318 |
| fessisentis tichiganensis sp. nov. (acanthocephala: fessisentidae) from wisconsin fishes, with a key to species. | fessisentis tichiganensis sp. nov. is described on the basis of 16 male and 24 female worms recovered from 11 species of fish of seven families in tichigan lake, southeastern wisconsin, between 1977 and 1979. specimens were most frequently encountered during the spring; the only two gravid females were recovered from umbra limi, in early june. the same fish also serves as a transport host. a key separating f. tichiganensis from the four other known species in north america is presented. the new ... | 1980 | 7218101 |