“…The mechanism of myelin formation is basically similar to that proposed for peripheral nerve and amphibian and mammalian optic nerve; it does not agree with present views on the mechanism of myelinogenesis in mammalian brain and cord. …”
Enlace del recurso
Enlace del recurso

“…One is reminded of the lip of an amphibian blastopore, which during gastrulation maintains its morphological identity as a lip but is nevertheless made up of constantly changing cells, with constantly changing outline and even constantly changing position. …”
Enlace del recurso
Enlace del recurso

“…The polarity of the epithelial sheet is emphasized and related to the physiological role of the urinary bladder in amphibian water balance mechanisms.…”
Enlace del recurso
Enlace del recurso

“…These patterns are broadly similar to the amphibian rod channel. The symmetry of the channel was tested by presenting the test ion on the extracellular side and using Na as the common reference ion on the cytoplasmic side. …”
Enlace del recurso
Enlace del recurso

“…Metabotropic γ-aminobutyric acid (GABA) receptors were studied in amphibian retinal ganglion cells using whole cell current and voltage clamp techniques. …”
Enlace del recurso
Enlace del recurso

“…We previously found that native cyclic nucleotide–gated (CNG) cation channels from amphibian rod cells are directly and reversibly inhibited by analogues of diacylglycerol (DAG), but little is known about the mechanism of this inhibition. …”
Enlace del recurso
Enlace del recurso

“…Centrosomes isolated from various sources, including human cells, have the capacity to induce parthenogenetic development when injected into unfertilized amphibian eggs. We recently isolated calf thymus centrosomes and showed that they differ structurally and functionally from previously isolated centrosomes of KE37 cells, in that the two centrioles in calf thymocytes are linearly associated by their proximal ends through a mass of electron dense material and nucleate few microtubules from their distal ends (Komesli, S., F. …”
Enlace del recurso
Enlace del recurso

“…BACKGROUND: In the Neotropics, nearly 35% of amphibian species are threatened by habitat loss, habitat fragmentation, and habitat split; anuran species with different developmental modes respond to habitat disturbance in different ways. …”
Enlace del recurso
Enlace del recurso
Enlace del recurso

“…Avian, and as we show here, lizard species lack the gene for UCP1, although it is present in amphibian and fish species. While ABALCs are therefore not functional brown adipocytes, they are generated by a developmental pathway virtually identical to brown fat differentiation in mammals: both the common adipogenic transcription factor peroxisome proliferator-activated receptor-γ (PPARγ), and a coactivator of that factor specific to brown fat differentiation in mammals, PGC1α, are elevated in expression, as are mitochondrial volume and DNA. …”
Enlace del recurso
Enlace del recurso
Enlace del recurso

“…Nor, to date, have there been any studies of MHC in wild amphibian host-pathogen systems. We characterise an MHC class I locus in the common frog, and present primers to amplify both the whole region, and specifically the antigen binding region. …”
Enlace del recurso
Enlace del recurso
Enlace del recurso

“…Measurements were conducted on amphibian (frog, toad, and salamander) and gecko rods. …”
Enlace del recurso
Enlace del recurso

“…We have named this formulation AMPHIPLEX, which is derived from the combination of the words amphibian and amplexus. This name refers to the specific reproductive behavior of frogs when the male mounts and clasps the female to induce ovulation and to fertilize the eggs as they are laid. …”
Enlace del recurso
Enlace del recurso
Enlace del recurso

“…BACKGROUND: Progesterone binding to the surface of the amphibian oocyte initiates the meiotic divisions. Our previous studies with Rana pipiens oocytes indicate that progesterone binds to a plasma membrane site within the external loop between the M1 and M2 helices of the α-subunit of Na/K-ATPase, triggering a cascade of lipid second messengers and the release of the block at meiotic prophase. …”
Enlace del recurso
Enlace del recurso
Enlace del recurso

“…RESULTS: We show that breast cancer cells can be directly reprogrammed by amphibian oocyte extracts. The reprogramming effect, after six hours of treatment, in the absence of DNA replication, includes DNA demethylation and removal of repressive histone marks at the promoters of tumour suppressor genes; also, expression of the silenced genes is re-activated in response to treatment. …”
Enlace del recurso
Enlace del recurso
Enlace del recurso

“…Here, we pre-exposed embryonic woodfrogs, Rana sylvatica, to the odour of a tiger salamander, Ambystoma tigrinum, without risk reinforcement, and later try to teach the tadpoles to recognize the salamander, a red-bellied newt Cynops pyrrhogaster—a closely related amphibian, or a goldfish, Carassius auratus, as a predator. …”
Enlace del recurso
Enlace del recurso
Enlace del recurso

“…METHODOLOGY/PRINCIPAL FINDINGS: By interfering with limb development, the trematode Ribeiroia ondatrae causes particularly severe morphological alterations within amphibian hosts that provide an ideal system to evaluate parasite-induced changes in phenotype. …”
Enlace del recurso
Enlace del recurso
Enlace del recurso

“…CONCLUSION: IC-20 represents a novel bradykinin antagonizing peptide from amphibian skin secretions and is the third such peptide found to be co-encoded with bradykinins within skin kininogens.…”
Enlace del recurso
Enlace del recurso
Enlace del recurso

“…Studies of genetic diversity using neutral molecular markers show that patterns of isolation by distance (IBD) or barrier effect may be evident for geographic variation at the molecular level in amphibian species. However, selective factors such as habitat, predator, or interspecific interactions may be critical for geographic variation in sexual traits. …”
Enlace del recurso
Enlace del recurso
Enlace del recurso

“…With the genomic assembly of the green anole, Anolis carolinensis available, non-avian reptilian genes can now be compared to mammalian, avian, and amphibian homologs. Furthermore, with more than 350 extant species in the genus Anolis, anoles are an unparalleled example of tetrapod genetic diversity and divergence. …”
Enlace del recurso
Enlace del recurso
Enlace del recurso

“…Hosts are mainly fish, frogs, toads, turtles or crabs, all sharing smooth, moist or mucous skins and waterborne or amphibian lifestyles; occasionally superficial infections in humans are noted. …”
Enlace del recurso
Enlace del recurso
Enlace del recurso