| mitotic variations in the lens epithelium of the frog iv. studies with isolated anuran pituitary factors. | proteins corresponding to growth hormone and prolactin have been electrophoretically separated from the pituitary gland of the frog (rana pipiens berlandieri and rana catesbeiana). these substances can independently stimulate mitosis in the lenses of animals where it had previously been inhibited by means of hypophysectomy. dna synthesis is greatly augmented six days after the start of hormone administration to intact animals. nine days are required before this occurs in hypophysectomized ones. ... | 1976 | 1087617 |
| occurrence of tetrathyridia of mesocestoides sp. (cestoidea: cyclophyllidea) in north american anurans (amphibia). | a new host and geographic locality record is reported for tetrathyridia of mesocestoides sp. in two species of ranid frogs (rana berlandieri and r. pipiens) from texas and new york, respectively. tetrathyridia were found encapsulated in liver and mesenteries of the hosts. morphological examination and experimental inoculation of these tetrathyridia into mice demonstrated the absence of capacity for asexual proliferation. overall prevalence of infection was low in anurans from arkansas, texas and ... | 1990 | 2250332 |
| the effects of aquatic oxygen concentration, body size and respiratory behaviour on the stamina of obligate aquatic (bufo americanus) and facultative air-breathing (xenopus laevis and rana berlandieri) anuran larvae. | larvae of the anurans rana berlandieri and xenopus laevis have lungs and can breathe air as well as irrigate buccal and pharyngeal surfaces for aquatic respiration. larvae of bufo americanus lack lungs until just before metamorphosis and are obligately aquatic. we examined the relationship between the locomotor stamina (time to fatigue), aquatic oxygen concentration, body size, and respiratory behaviour of swimming larvae of these species, with the following results: stamina is size-dependent in ... | 1983 | 6619726 |
| differentiation of mexican species of haematoloechus looss, 1899 (digenea: plagiorchiformes): molecular and morphological evidence. | molecular evidence is interpreted in the light of morphology to examine the validity of several species of haematoloechus described as mexican endemics. internal transcribed spacers 1 and 2 and 28s ribosomal genes were sequenced for 11 isolates. phylogenetic analysis of separate partitions and combined databases was conducted. results were analyzed, in the light of morphological evidence. haematoloechus macrorchis is proposed as a junior synonym of haematoloechus longiplexus. haematoloechus pulc ... | 1999 | 10577731 |
| peptides with antimicrobial activity from four different families isolated from the skins of the north american frogs rana luteiventris, rana berlandieri and rana pipiens. | the skins of frogs of the genus rana synthesize a complex array of antimicrobial peptides that may be grouped into eight families on the basis of structural similarity. a total of 24 peptides with differential growth-inhibitory activity towards the gram-positive bacterium staphylococcus aureus, the gram-negative bacterium escherichia coli and the yeast candida albicans were isolated from extracts of the skins of three closely related north american frogs, rana luteiventris (spotted frog), rana b ... | 2000 | 10651828 |
| phylogenetic relationships of leopard frogs (rana pipiens complex) from an isolated coastal mountain range in southern sonora, mexico. | mitochondrial dna sequence data from the control region and 12s rrna in leopard frogs from the sierra el aguaje of southern sonora, mexico, together with genbank sequences, were used to infer taxonomic identity and provide phylogenetic hypotheses for relationships with other members of the rana pipiens complex. we show that frogs from the sierra el aguaje belong to the rana berlandieri subgroup, or scurrilirana clade, of the r. pipiens group, and are most closely related to rana magnaocularis fr ... | 2008 | 18625327 |
| thyroid hormones stimulate in vivo oxygen consumption of adult rana pipiens berlandieri at high environmental temperatures. | | 2005 | 1087616 |
| structure, cytochemistry, and locomotion of haemogregarina sp. from rana berlandieri. | | 1973 | 4632264 |
| the chinese bamboo leaf odorous frog (rana (odorrana) versabilis) and north american rana frogs share the same families of skin antimicrobial peptides. | the chinese bamboo leaf odorous frog (rana (odorrana) versabilis) and the north american pickerel frog (rana palustris) occupy different ecological niches on two different continents with no overlap in geographical distribution. r. palustris skin secretions contain a formidable array of antimicrobial peptides including homologs of brevinin-1, esculentin-1, esculentin-2, ranatuerin-2, a temporin and a family of peptides considered of unique structural attributes when isolated, palustrins 1-3. her ... | 2006 | 16621152 |
| phylogeny of the mexican coastal leopard frogs of the rana berlandieri group based on mtdna sequences. | phylogenetic relationships among specimens from 25 different locations for the six mexican coastal leopard frog species of the rana berlandieri species group were investigated using 797 bp of the mitochondrial 12s rdna gene. relationships among the haplotypes obtained were recovered using maximum parsimony and bayesian analyses. most of the clades recovered by both tree building methods are strongly supported, but conflicting clades recovered by each analysis are generally poorly supported. both ... | 2004 | 15022756 |
| purification and characterization of tissue kallikrein-like proteinases from the black sea bass (centropristis striata) and the southern frog (rana berlandieri). | serine proteinases were isolated from the pyloric caeca of the black sea bass (centropristis striata) and the pancreas of the southern frog (rana berlandieri) and were purified to apparent homogeneity by aprotinin affinity column chromatography, reverse phase high performance liquid chromatography and gel filtration fplc liquid chromatography to produce products with molecular masses of approximately 27,000 da and isoelectric points from 4.2 to 5.0. both enzymes were kallikrein-like and were bou ... | 1995 | 7656186 |
| validation of water-borne cortisol and corticosterone in tadpoles: recovery rate from an acute stressor, repeatability, and evaluating rearing methods. | amphibian populations are declining globally, so understanding how individuals respond to anthropogenic and environmental stressors may aid conservation efforts. using a non-invasive water-borne hormone assay, we measured the release rates of two glucocorticoid hormones, corticosterone and cortisol, in rio grande leopard frog, rana berlandieri, tadpoles. we validated this method pharmacologically and biologically using an adrenocorticotropic hormone (acth) challenge, exposure to exogenous cortic ... | 2019 | 31199927 |
| standardized ethograms and a device for assessing amphibian thermal responses in a warming world. | most predictions of how populations and species of ectotherms will respond to global warming are based on estimates of the temperature at which organisms lose motor control (i.e., ctmax - the critical thermal maximum). here, we describe a non-lethal protocol and ethograms to estimate the relative tolerance of amphibians to increasing temperatures. these methods-suitable for field or laboratory conditions-are replicable, inexpensive and applicable to both post-metamorphic stages and organisms wit ... | 2020 | 32364996 |
| localization and characterization of adrenergic receptors on frog skin melanophores. | the functional location of adrenergic binding sites was studied in frog skin melanophores by injecting norepinephrine (ne) outside and inside a melanophore. in 49 groups of cells (75% of the fields tested) iontophoretic injection of ne outside the cell caused melanosome aggregation in the target cell and/or in the field. in six cells in which a resting membrane potential was measured before and after intracellular injection (10-90 na), ne elicited no change in melanosome configuration. once the ... | 1981 | 6972704 |
| erythrocytic organic phosphates: diel and seasonal cycles in the frog, rana berlandieri. | hemoglobin (hb) concentration, hematocrit (hct), total organic phosphates (ptot), nucleoside triphosphates (ntp), 2,3-diphosphoglycerate (dpg), and "inositol polyphosphates" (ipp) were measured in the erythrocytes of adult frogs at different times of day in winter and summer after acclimatization to 15 degrees c and an ld 12:12 photoperiod. the same measurements were also made on animals acclimated to ld 16:8 in summer. all of the measured parameters varied significantly at different times of th ... | 1984 | 6150789 |
| sequence and expression of a frog brain complementary dna encoding a kainate-binding protein. | excitatory amino acids (eaas) are important neurotransmitters in the vertebrate central nervous system. electrophysiological and ligand-binding studies indicate that at least three different receptor subtypes for eaas exist--n-methyl-d-aspartate, kainate and quisqualate receptor subtypes--on the basis of the preferred agonist of the receptors. we recently purified a kainate-binding protein (kbp) from frog (rana pipiens berlandieri) brain by domoic acid (a high-affinity kainate analogue) affinity ... | 1989 | 2556640 |
| experimental exposure of adult san marcos salamanders and larval leopard frogs to the cercariae of centrocestus formosanus. | the gill parasite centrocestus formosanus (trematoda: heterophyidae) is an exotic parasite of concern in texas because it has been shown to infect multiple threatened and endangered fish species. the purpose of this study was to determine if c. formosanus could present a threat to larval anurans, as well as threatened neotenic salamanders endemic to the spring-fed systems of texas. we exposed adults of the san marcos salamander eurycea nana (caudata: plethodontidae) and tadpoles of the rio grand ... | 2014 | 24303882 |
| prostaglandin effects upon cyclic amp levels, corticosterone output, and aldosterone output in the adrenal of the frog, rana berlandieri forreri. | | 1982 | 220137 |
| tissue kallikreins in evolutionarily diverse vertebrates. | a search for tissue kallikreins in lower vertebrates resulted in the discovery of three novel kallikreins. tissue kallikrein was isolated from the salivary gland of the eastern atlantic mole, scalopus aquaticus, and the pancreas of the southern frog, rana berlandieri. a prokallikrein was identified in skeletal muscle of the black sea bass, centropristis striata. these enzymes range in molecular mass from 27 to 36 kda and are acidic proteins with pis between 4.2 and 5.3. bass prokallikrein was ac ... | 1996 | 8796277 |
| camp involvement in the control of corticosterone and aldosterone output in the adrenal of the frog (rana berlandieri forreri) | | 1978 | 214370 |
| secretion of melanophore-stimulating hormone (msh) in long-term cultures of pituitary neurointermediate lobes. | neurointermediate lobes from pituitaries of the frog, rana berlandieri forreri (rana pipiens, sensu lato), were maintained in organ culture in media with and without serum for up to six months. the cultured tissues were examined periodically by light microscopy and transmission electron microscopy and by bioassay of the melanophore-stimulating hormone (msh) secreted and present in the culture media. light-microscopic observations revealed a high degree of preservation of the pars intermedia at f ... | 1978 | 309795 |
| central nervous system control of mucous gland secretion from frog skin. | surface electrical stimulation of the diencephalic roof of the frog. rana berlandieri forreri, brain initiates integumental mucous gland secretion which is abolished by pithing. | 1979 | 499414 |
| interspersion of repetitive with repetitive sequences in an amphibian, rana berlandieri. | when conventional genome arrangement analyses performed on r. berlandieri dna at a normal (60 degrees c) and a high (75 degrees c) reassociation temperature were compared, an additional interspersion pattern was detected which indicates that different classes of repetitive sequences are closely interspersed with each other. our results further suggest that the genomic abundance of purified (or cloned) repetitive sequences can be accurately determined by solution hybridization with genomic dna on ... | 1980 | 6969394 |