What's the difference between batfish and ratfish?
Batfish
Definition:
(n.) A name given to several species of fishes: (a) The Malthe vespertilio of the Atlantic coast. (b) The flying gurnard of the Atlantic (Cephalacanthus spinarella). (c) The California batfish or sting ray (Myliobatis Californicus.)
Example Sentences:
(1) The temperature dependency of protein synthesis was studied in vivo in five species of Pacific fish collected in the Galapagos and Perlas Islands: batfish (Ogcocephalus darwini), groupers (Epinephelus labriformis), catfish (Netuma platypogan), puffers (Arothron hispidus) and triggerfish (Sufflamen verres).
(2) Fish species considered ciguatoxic includes red emperor, red snapper, roundfaced batfish, barracuda and blue lined sea-bream.
Ratfish
Definition:
(n.) Same as Rat-tail.
Example Sentences:
(1) Ratfish serum proteins have been fractionated by ammonium sulfate, followed by gel filtration on Sepharose 6B.
(2) Elephantfish and pig glucagons differ at only four positions, but there are six changes from the ratfish glucagon-36 (normal glucagon contains 29 residues) sequence.
(3) Brain extract from the spotted ratfish, Hydrolagus colliei, contains gonadotropin-releasing hormone (GnRH)-like peptides in both sexes.
(4) Sertoli cells in the ratfish entirely surround a clone of spermatids to form a spermatocyst.
(5) A potent, highly selective bombesin receptor antagonist completely abolished the stimulation of amylase release caused by the ratfish peptide, demonstrating the specificity of the response.
(6) A highly purified bombesin-like peptide-containing fraction stimulated amylase release in a dose-responsive fashion from rat pancreatic acini; the dose-response curve was parallel to a bombesin standard, and the ratfish peptide stimulated the same maximal rate of amylase secretion as the bombesin standard.
(7) The primary structure of insulin from the Holocephalan fish, Hydrolagus colliei (the ratfish), has been established by automated Edman degradation as: (Formula: see text).
(8) The presence of a COOH-terminal extension to the B-chain is consistent with the occurrence of a single base mutation in the region of the gene encoding one of the dibasic residue processing sites [Arg31(AGA)----Ile* (AUA)] with the result that the ratfish has utilised an alternative cleavage site within the C-peptide region of proinsulin.
(9) Two molecular forms of glucagon-like peptide were isolated from the ratfish pancreas.
(10) A 36-amino-acid-residue peptide was isolated from the pancreas of a holocephalan fish, the Pacific ratfish (Hydrolagus colliei), that shows homology (69%) to mammalian glucagon in its N-terminal region and is reactive towards an N-terminally directed antiserum.
(11) Spermiogenesis in the ratfish (Hydrolagus colliei) is characterized by unusual changes in the basic proteins of the nucleus.
(12) Ratfish (Hydrolagus colliei) intestines were boiled in water to inactivate proteases and then treated with cold 4% trifluoroacetic acid to extract bombesin-like peptides.
(13) Pituitary extracts from all animals, except the ratfish, goldfish and trout, contained IR-CGRP.
(14) The ratfish represents the most primitive organism that contains a form of GnRH that coelutes with chicken II and salmon II GnRH.
(15) The insulin B-chain contains 31 residues, one more than mammalian insulins, but markedly less than that of the closely related ratfish with which it otherwise exhibits high sequence similarity.
(16) The insulin with 38 amino acids in the B-chain was equipotent with human insulin in inhibiting the binding of radiolabelled human insulin to rat fat cells but the maximum effect of ratfish insulin upon the transport of 3-O-methylglucose into the cells was only 65% of the maximum effect of human insulin.
(17) In contrast to the heavy chain, the ratfish light chains display low sequence similarity with their shark kappa counterparts.
(18) It is argued that the ratfish GnRH molecule has been retained for over 400 million years of evolution and is expressed in most vertebrate classes.
(19) The amino acid compositions of both rabbit fish and ratfish insulins demonstrated a value consistently lower than that expected for the leucine content of the peptides.
(20) Gonadotropin-releasing hormone (GnRH) in the ratfish brain has been isolated and purified using reverse-phase high performance liquid chromatography.