| bis-phosphatidic acid plasmalogen in brain of amia calva and its correlation with the infarct plasmalogen and the cardiolipin (diphosphatidyl glycerol) series of phosphatides. | | 1975 | 3368 |
| vector specificity of trypanosoma catostomi and its infectivity to freshwater fishes. | trypanosoma catostomi was found in 36.2% of 558 white suckers (catostomus commersoni) from ontario, canada. the abundance of actinobdella inequiannulata was 35% (68 leeches/197 suckers examined for leeches). the susceptibility of 3 species of leeches (hemiclepsis marginata, desserobdella phalera, and a. inequiannulata) and 7 species of fishes (c. commersoni, amia calva, anguilla rostrata, ictalurus nebulosus, oncorhynchus mykiss, perca flavescens, and esox lucius) to infection with t. catostomi ... | 1992 | 1738075 |
| culture characteristics of trypanosoma catostomi and trypanosoma phaleri from north american freshwater fishes. | culture characteristics of two species of piscine trypanosomes were compared. trypanosoma catostomi from catostomus commersoni was isolated in hypo-osmotic blood agar media but not in hyper-osmotic media. however, t. phaleri from amia calva was isolated in both media. only t. catostomi was stimulated to divide by diluting infected blood with water. the maximum number of t. phaleri and percentage of trypomastigotes were not affected by nacl concentration. the maximum number of t. catostomi was in ... | 1991 | 1745549 |
| actions of cholecystokinin-related peptides on the gallbladder of bony fishes in vitro. | 1. cholecystokinin (cck) family peptides elicited dose-related gallbladder contractions in vitro for bluegill (lepomis macrochirus), killifish (fundulus heteroclitus), and bowfin (amia calva). 2. effects measured by increases in isometric contractions indicated equipotency for nonsulfated forms of cck and caerulein (crl; bluegill) and for sulfated cck and crl (bluegill, fundulus). sulfation increased potency. 3. responses to cck-related peptides were insensitive to atropine, a muscarinic antagon ... | 1988 | 2904870 |
| cholecystokinin immunoreactivity in the digestive tract of bowfin (amia calva), bluegill (lepomis macrochirus), and bullfrog (rana catesbeiana). | the distribution of the intestinal hormone, cholecystokinin (cck), was studied in the gastrointestinal tract of a holostean fish, the bowfin (amia calva), and compared to a teleostean fish, the bluegill (lepomis macrochirus), and an amphibian, the bullfrog (rana catesbeiana), using an antiserum specific for the carboxyl terminal tetrapeptide of cck in an unlabeled biotin-avidin immunoperoxidase procedure. in the bowfin cck immunostained cells were detected only in the anterior and mid-intestine; ... | 1988 | 3286368 |
| purification and characterization of galanin from the phylogenetically ancient fish, the bowfin (amia calva) and dogfish (scyliorhinus canicula). | galanin was purified to near homogeneity from an extract of the stomachs of the holostean fish, the bowfin and the elasmobranch fish, the european common dogfish. bowfin galanin contains an alpha'-amidated c-terminal residue and the primary structure of the peptide (gwtnl sagyl lgpha vdnhr slndk hgla) shows only four amino acid substitutions (val16-->ile, leu22-->phe, asn23-->his, and his26-->tyr) compared with pig galanin. dogfish galanin was isolated in a truncated form for which amino acid se ... | 1994 | 7527531 |
| purification and structural characterization of vasoactive intestinal polypeptide from the trout and bowfin. | vasoactive intestinal polypeptide (vip) was purified from extracts of the stomachs of the rainbow trout, oncorhynchus mykiss, and the bowfin, amia calva. the primary structure of vip from both species was the same: his-ser-asp-ala-ile-phe-thr-asp-asn-tyr10- ser-arg-phe-arg-lys-gln-met-ala-val-lys20-lys-tyr-leu-asn-ser-val- leu-thr. this amino acid sequence shows only one amino acid substitution (val5-->ile) compared with the common sequence of vip from the chicken, alligator, and european green ... | 1995 | 7781967 |
| tetrapod-type [asp1] angiotensin is present in a holostean fish, amia calva. | the renin-angiotensin system has been identified in various vertebrates, from elasmobranchs to mammals. tetrapod (amphibians to mammals) angiotensin (ang) has asp at the n-terminus, but asp is replaced by asn in elasmobranch and teleost fish. ang i has been isolated from incubates of plasma and kidney extracts of the bowfin amia calva, a holostean fish, using the eel vasopressor activity as an assay system; its sequence was found to be h-asp-arg-val-tyr-val-his-pro-phe-asn-leu-oh after sequence ... | 1998 | 9570934 |
| mercury and selenium in fish from the savannah river: species, trophic level, and locational differences. | levels of contaminants in fish are of considerable interest because of potential effects on the fish themselves, as well as on other organisms that consume them. in this article we compare the mercury levels in muscle tissue of 11 fish species from the savannah river, as well as selenium levels because of its known protective effect against mercury toxicity. we sampled fish from three stretches of the river: upstream, along, and downstream the department of energy's savannah river site, a former ... | 2001 | 11683594 |
| evolution of the immune response. i. the phylogenetic development of adaptive immunologic responsiveness in vertebrates. | 1. the california hagfish, eptatretus stoutii, seems to be completely lacking in adaptive immunity: it forms no detectable circulating antibody despite intensive stimulation with a range of antigens; it does not show reactivity to old tuberculin following sensitization with bcg; and gives no evidence of homograft immunity. 2. studies on the sea lamprey, petromyzon marinus, have been limited to the response to bacteriophage t(2) and hemocyanin in small groups of spawning animals. they suggest tha ... | 1964 | 14113107 |
| adaptation of haplobothrium globuliforme (cestoda: pseudophyllidea) to the intestinal architecture of the bowfin (amia calva l). | haplobothrium globuliforme maintains its position in the proximal mid-gut epithelium of amia calva with the aid of tentacles, i.e., proboscides, everted from scolices of a primary strobila and craspedote proglottids of a secondary strobila. weakly developed scolices of the secondary strobila appear to have little holdfast action, but the distinctly craspedote proglottids of these individuals project into the intestinal mucosa, altering the configuration of gut epithelial cells and pushing the ta ... | 2009 | 18578575 |
| redescription of testudotaenia testudo (magath, 1924) (eucestoda: proteocephalidea), a parasite of apalone spinifera (le sueur) (reptilia: trionychidae) and amia calva l. (pisces: amiidae) in north america and erection of the testudotaeniinae n. subfam. | testudotaenia testudo (magath, 1924) is redescribed from the intestine of the softshell turtle apalone spinifera (le sueur) (trionychidae) and the bowfin amia calva linnaeus (amiidae) from reelfoot lake, tennessee, united states. a new subfamily, the testudotaeniinae, is erected. the new taxon differs from all proteocephalidean subfamilies in the position of the genital organs in relation to the longitudinal internal musculature, i.e. the testes are cortical, rarely medullary; the ovary is partl ... | 2009 | 19337859 |
| the transition in hemoglobin proton-binding characteristics within the basal actinopterygian fishes. | carbon dioxide (co(2)) transport in the blood of fishes is aided by the proton-binding properties of hemoglobin (hb) through either a high-intrinsic buffer value and small oxylabile proton binding (haldane effect), or a low buffer value and large haldane effect. primitive species, such as elasmobranchs and sarcopterygians have been shown to rely on the former, while derived species, such as teleosts rely on the latter. both strategies are effective in the transport of co(2) in the blood. however ... | 2010 | 20044754 |
| the evolution of root effect hemoglobins in the absence of intracellular ph protection of the red blood cell: insights from primitive fishes. | the root effect, a reduction in blood oxygen (o(2)) carrying capacity at low ph, is used by many fish species to maximize o(2) delivery to the eye and swimbladder. it is believed to have evolved in the basal actinopterygian lineage of fishes, species that lack the intracellular ph (ph(i)) protection mechanism of more derived species' red blood cells (i.e., adrenergically activated na(+)/h(+) exchangers; betanhe). these basal actinopterygians may consequently experience a reduction in blood o(2) ... | 2010 | 20213180 |
| primary structure of stanniocalcin in two basal actinopterygii. | the primary structure of stanniocalcin (stc), the principal product of the corpuscles of stannius (cs) in ray-finned fishes, was deduced from stc cdna clones for two species of holostean, the gar, lepisosteus osseus and the bowfin, amia calva. overlapping partial cdna clones were amplified by polymerase chain reaction (pcr) from single-strand cdna of the cs. excluding the poly(a) tail, the cdnas of 1863 base pairs [bp] (gar) and 914 bp (bowfin) contained the 5' untranslated region followed by th ... | 2004 | 14697312 |
| chloride inhibition of nitrite uptake for non-teleost actinopterygiian fishes. | fish that transport environmental chloride with a gill uptake mechanism (gill epithelial cl(-)/hco(3)(-)cotransport exchange system), also transport nitrite into plasma through the same mechanism. because of the relationship between nitrite uptake and the gill chloride uptake mechanism, nitrite uptake can provide insight regarding the method of chloride uptake for fish. this study was designed to determine if non-teleost fishes concentrate nitrite in their plasma, and to determine if chloride in ... | 2007 | 17344081 |
| unusual intraindividual variation of the nuclear 18s rrna gene is widespread within the acipenseridae. | significant intraindividual variation in the sequence of the 18s rrna gene is unusual in animal genomes. in a previous study, multiple 18s rrna gene sequences were observed within individuals of eight species of sturgeon from north america but not in the north american paddlefish, polyodon spathula, in two species of polypterus (polypterus delhezi and polypterus senegalus), in other primitive fishes (erpetoichthys calabaricus, lepisosteus osseus, amia calva) or in a lungfish (protopterus sp.). t ... | 2008 | 16714428 |
| molecular cloning and sequence analysis of full-length growth hormone cdnas from six important economic fishes. | in this study,the full-length cdnas of gh (growth hormone) gene was isolated from six important economic fishes, siniperca kneri, epinephelus coioides, monopterus albus, silurus asotus, misgurnus anguillicaudatus and carassius auratus gibelio bloch. it is the first time to clone these gh sequences except e. coioides gh. the lengths of the above cdnas are as follows: 953 bp, 1 023 bp, 825 bp, 1 082 bp, 1 154 bp and 1 180 bp. each sequence includes an orf of about 600 bp which encodes a protein of ... | 2005 | 15715434 |
| response by the corpuscles of stannius to hypotensive stimuli in three divergent ray-finned fishes (amia calva, anguilla rostrata, and catastomus commersoni): cardiovascular and morphological changes. | in accordance with their vital role in cardiovascular physiology () corpuscles of stannius (cs) from two teleosts and an holostean species showed marked and consistent degranulation and exocytotic responses to hypotensive stimuli. in eels (anguilla rostrata lesueur) acute blood withdrawal (hypovolemic hypotension) was followed by a prompt decrease in cardiac output (co) and dorsal aortic pressure (p(da)), a compensatory tachycardic response and an increase in systemic vascular resistance (r(sys) ... | 2003 | 12812766 |
| the endocrine cells in the gastroenteropancreatic system of the bowfin, amia calva l.: an immunohistochemical, ultrastructural, and immunocytochemical analysis. | the gastroenteropancreatic (gep) endocrine system of bowfin (amia calva) was described using light and electron microscopy and immunological methods. the islet organ (endocrine pancreas) consists of diffusely scattered, mostly small islets and isolated patches of cells among and within the exocrine acini. the islets are composed of abundant, centrally located b cells immunoreactive to bovine and lamprey insulin antisera and d cells showing a widespread distribution and specificity to somatostati ... | 2001 | 11746461 |
| purification and structural characterization of insulin and glucagon from the bichir polypterus senegalis (actinopterygii: polypteriformes). | the polypteriformes (bichirs and reedfish) are a family of ray-finned fishes of ancient lineage. insulin has been isolated from an extract of the pancreas and upper gastrointestinal tract of the bichir polypterus senegalis and its primary structure established as a-chain: gly-ile-val-glu-gln-cys-cys-asp-thr-pro10-cys-ser- leu-tyr-asp-leu-glu-asn-tyr-cys20-asn: b-chain: ala-ala-asn-arg-his-leu-cys-gly-ser-his10-leu-val- glu-ala-leu-tyr-leu-val-cys-gly20-asn-arg-gly-phe- phe-tyr-ile-pro-ser-lys30- ... | 1998 | 9446726 |
| structure and biological activity of glucagon and glucagon-like peptide from a primitive bony fish, the bowfin (amia calva). | the bowfin, amia calva (order amiiformes) occupies an important position in phylogeny as a surviving representative of a group of primitive ray-finned fishes from which the present-day teleosts may have evolved. glucagon and glucagon-like peptide (glp) were isolated from an extract of bowfin pancreas and their primary structures determined. bowfin glucagon shows only four amino acid substitutions compared with human glucagon, and bowfin glucagon was equipotent and equally effective as human gluc ... | 1993 | 8240302 |
| dinitrophenyl-reactive immunoglobulins in the serum of normal bowfin, amia calva. | | 1972 | 4624342 |
| heterogeneity of fish taste bud ultrastructure as demonstrated in the holosteans amia calva and lepisosteus oculatus. | taste buds are the peripheral sensory organs of the gustatory system. they occur in all taxa of vertebrates and are pear-shaped intra-epithelial organs of about 80 microm height and 50 microm width. taste buds mainly consist of specialized epithelial cells, which synapse at their bases and therefore are secondary sensory cells. taste buds have been described based on studies of teleostean species, but it turned out that the ultrastructure of teleostean taste buds may differ between distinct syst ... | 2000 | 11079403 |
| purification and characterization of galanin and scyliorhinin i from the hybrid sturgeon, scaphirhynchus platorynchus x scaphirhynchus albus (acipenseriformes). | the sturgeons (order acipenseriformes) are extant representatives of a group of ancient actinopterygian (ray-finned) fish. galanin and scyliorhinin i (a tachykinin with limited structural similarity to mammalian substance p) have been isolated from an extract of the gastrointestinal tract of a sturgeon (an f1 hybrid between the shovelnose sturgeon, scaphirhynchus platorynchus, and the pallid sturgeon, scaphirhynchus albus). the primary structure of sturgeon galanin (gly-trp-thr-leu-asn-ser-ala-g ... | 1999 | 9882542 |
| evolution of motor patterns: aquatic feeding in salamanders and ray-finned fishes. | patterns of muscle activity (motor patterns) have generally been found to be strongly conserved during the evolution of aquatic feeding behavior within closely related groups of fishes and salamanders. we conducted a test of the generality of motor pattern conservation with a much broader phylogenetic scope than has been done previously. activity patterns of three cranial muscles were quantified from electromyographic (emg) recordings made during suction feeding in a salamander (ambystoma mexica ... | 1989 | 2611639 |
| immunocytochemical location of pituitary cells containing acth, alpha-msh, and beta-endorphin in acipenser transmontanus, lepisosteus spatula, and amia calva. | this immunocytochemical study of the pituitaries of the primitive actinopterygians, acipenser transmontanus, lepisosteus spatula, and amia calva, showed a strict delineation between the hormonal fragments of proopiomelanocorticotropin (pomc) produced by corticotropes of the pars distalis and the melanotropes of the pars intermedia. corticotropes were immunoreactive only for acth and not to either of the further degradation products, alpha-msh or beta-endorphin. melanotropes were shown to be immu ... | 1990 | 2161379 |
| structure and receptor-binding activity of insulin from a holostean fish, the bowfin (amia calva). | the holostean fishes are the extant representatives of the primitive ray-finned fishes from which the present-day teleosts may have evolved. the primary structure of insulin from a holostean fish, the bowfin (amia calva), was established as: a-chain: gly-ile-val-glu-gln-cys-cys-leu-lys-pro-cys-thr-ile-tyr-glu-met-glu- lys-tyr-cys-asn b-chain: ala-ala-ser-gln-his-leu-cys-gly-ser-his-leu-val-glu-ala-leu-phe-leu- val-cys-gly-glu-ser-gly-phe-phe-tyr-asn-pro-asn-lys-ser this amino acid sequence conta ... | 1991 | 2039477 |
| homology of lungs and gas bladders: insights from arterial vasculature. | gas bladders of ray-finned fishes serve a variety of vital functions and are thus an important novelty of most living vertebrates. the gas bladder has long been regarded as an evolutionary modification of lungs. critical evidence for this hypothesized homology is whether pulmonary arteries supply the gas bladder as well as the lungs. pulmonary arteries, paired branches of the fourth efferent branchial arteries, deliver blood to the lungs in osteichthyans with functional lungs (lungfishes, tetrap ... | 2013 | 23378277 |
| building blocks of a fish head: developmental and variational modularity in a complex system. | evolution of the vertebrate skull is developmentally constrained by the interactions among its anatomical systems, such as the dermatocranium and the sensory system. the interaction between the dermal bones and lateral line canals has been debated for decades but their morphological integration has never been tested. an ontogenetic series of 97 juvenile and adult amia calva (actinopterygii) was used to describe the patterning and modularity of sensory lateral line canals and their integration wi ... | 2015 | 26227536 |
| "holostei versus halecostomi" problem: insight from cytogenetics of ancient nonteleost actinopterygian fish, bowfin amia calva. | bowfin belongs to an ancient lineage of nonteleost ray-finned fishes (actinopterygians) and is the only extant survivor of a once diverged group, the halecomorphi or amiiformes. owing to the scarcity of extant nonteleost ray-finned lineages, also referred as "living fossils," their phylogenetic interrelationships have been the target of multiple hypotheses concerning their sister group relationships. molecular and morphological data sets have produced controversial results; bowfin is considered ... | 2017 | 28074622 |
| fish communities in coastal freshwater ecosystems: the role of the physical and chemical setting. | we explored how embayment watershed inputs, morphometry, and hydrology influence fish community structure among eight embayments located along the southeastern shoreline of lake ontario, new york, usa. embayments differed in surface area and depth, varied in their connections to lake ontario and their watersheds, and drained watersheds representing a gradient of agricultural to forested land use. | 2008 | 19114002 |
| fundal variations in the eyes of the osteoglossomorph fishes. | the appearance of the fundus of the eye varies among the families of osteoglossomorph teleosts. in this study, four different fundal patterns were observed: (i) an anteroposterior (or horizontal) embryonic fissure with a septal falciform process (family osteoglossidae); (ii) an embryonic fissure from the optic disc nasoventrally with a falciform process (family arapaimidae); (iii) an embryonic fissure nasoventrally from the optic disc without a falciform process (family hiodontidae); and (iv) ne ... | 2013 | 3843071 |
| a fish bradykinin (arg0, trp5, leu8-bradykinin) from the defensive skin secretion of the european edible frog, pelophylax kl. esculentus: structural characterization; molecular cloning of skin kininogen cdna and pharmacological effects on mammalian smooth muscle. | extensive studies on bradykinin-related peptides (brps) generated from plasma kininogens in representative species of various vertebrate taxa, have confirmed that many amphibian skin brps reflect those present in putative vertebrate predators. for example, the (val(1), thr(6))-bradykinin, present in the defensive skin secretions of many ranids and phyllomedusines, can be generated from plasma kininogens in colubrid snakes-common predators of these frogs. here, we report the presence of (arg(0), ... | 2010 | 20923691 |
| the evolution of amphibian metamorphosis: insights based on the transformation of the aortic arches of pelobates fuscus (anura). | in order to gain insights into how the aortic arches changed during the transition of vertebrates to land, transformations of the aortic arches during the metamorphosis of pelobates fuscus were investigated and compared with data from the early development of a recent ganoid fish amia calva and a primitive caudate amphibian salamandrella keyserlingi. although in larval pelobates, as in other non-pipid anurans, the gill arches serve partly as a filter-feeding device, their aortic arches maintain ... | 2007 | 17367494 |
| biomechanics of a convergently derived prey-processing mechanism in fishes: evidence from comparative tongue bite apparatus morphology and raking kinematics. | a tongue-bite apparatus (tba) governs raking behaviors in two major and unrelated teleost lineages, the osteoglossomorph and salmoniform fishes. we present data on comparative morphology and kinematics from two representative species, the rainbow trout (oncorhynchus mykiss) and the australian arowana (scleropages jardinii), which suggest that both the tba and raking are convergently derived in these lineages. similar tba morphologies were present, except for differences in tba dentition and shap ... | 2008 | 18931311 |
| mercury in south carolina fishes, usa. | the south carolina department of health and environmental control has collected, processed, and analyzed fish tissue total mercury (hg) since 1976. for this study, skin-on-filet data from 1993 to 2007 were examined to determine biotic, spatial and temporal trends in tissue hg levels for sc fishes. because of the relatively high number of tissue hg values below the analytical detection limits interval censored regression and censored least absolute deviations were used to construct several models ... | 2010 | 20058074 |
| cloning of a growth hormone from a primitive bony fish and its phylogenetic relationships. | growth hormone (gh), prolactin, and their relatives constitute a multigene family which is considered to have evolved from a common ancestor. the structural and functional domains of gh appear to be highly conserved among vertebrates. in order to investigate the phylogenetic relationships among ghs in the actinopterygii and sarcopterygii, we have cloned and sequenced gh from the pituitary of the primitive bony fish, amia calva. bony fishes (teleosts) and amia (halecomorphi) are purported sister- ... | 1994 | 7926657 |
| periodic air-breathing behaviour in a primitive fish revealed by spectral analysis | the ventilatory patterns of air-breathing fish are commonly described as 'arrhythmic' or 'irregular' because the variable periods of breath-holding are punctuated by seemingly unpredictable air-breathing events (see shelton et al. 1986). this apparent arrhythmicity contrasts with the perceived periodism or regularity in the gill ventilation patterns of some fish and with lung ventilation in birds and mammals. in this sense, periodism refers to behaviour that occurs with a definite, recurring int ... | 1994 | 9318071 |
| comparative analysis of the organization of the cholinergic system in the brains of two holostean fishes, the florida gar lepisosteus platyrhincus and the bowfin amia calva. | the cholinergic system in the brain has been widely studied in most vertebrate groups, but there is no information available about this neurotransmission system in the brains of holostean fishes, a primitive and poorly understood group of actinopterygian fishes. the present study provides the first detailed information on the distribution of cholinergic cell bodies and fibers in the central nervous system in two holostean species, the florida gar, lepisosteus platyrhincus, and the bowfin, amia c ... | 2013 | 23466570 |
| organization of inner ear endorgan projections in the goldfish, carassius auratus. | cytoarchitectural analysis of the octavolateralis area of the goldfish, carassius auratus, reveals that as in other teleosts, five first-order octaval nuclei are present: the anterior octaval, magnocellular, descending, tangential, and posterior octaval nuclei. the descending nucleus appears to be anatomically specialized relative to that of the halecomorph amia calva and many teleosts in that a large dorsomedial subpopulation of the nucleus lies medial to nucleus medialis, a first-order lateral ... | 1994 | 8038983 |
| detection of n-acetylated forms of alpha-msh and beta-endorphin in the intermediate pituitary of the holostean fishes, lepisosteus spatula, lepisosteus osseus, and amia calva. | acid extracts of the intermediate pituitaries of the gars, l. spatula and l. osseus, were fractionated by sephadex g-50 column chromatography and analyzed by radioimmunoassay. this procedure revealed that immunoreactive forms of n-acetylated beta-endorphin- and alpha-msh-sized material were present in equimolar amounts and represented the major end products of the pomc biosynthetic pathway in these species. cation-exchange chromatography indicated that multiple n-acetylated forms of beta-endorph ... | 1994 | 7937324 |
| kinematics of ribbon-fin locomotion in the bowfin, amia calva. | an elongated dorsal and/or anal ribbon-fin to produce forward and backward propulsion has independently evolved in several groups of fishes. in these fishes, fin ray movements along the fin generate a series of waves that drive propulsion. there are no published data on the use of the dorsal ribbon-fin in the basal freshwater bowfin, amia calva. in this study, frequency, amplitude, wavelength, and wave speed along the fin were measured in amia swimming at different speeds (up to 1.0 body length/ ... | 2013 | 24039242 |
| time domains of the hypoxic cardio-respiratory response in bowfin (amia calva). | the aim of this study was to determine whether time domains exist in the hypoxic ventilatory (hvr) and cardiac responses (hcr) of bowfin (amia calva), a facultative air breather, exposed to sustained hypoxia (sh) (26mmhg at 8°c or 45mmhg at 22°c). it was hypothesized that time domains would be evident in the hvr and hcr of bowfin when denied access to air during sh, as have been reported in mammals. it was also hypothesized that they would not be present in bowfin with access to air during sh be ... | 2014 | 24373839 |
| the effect of sustained hypoxia on the cardio-respiratory response of bowfin amia calva: implications for changes in the oxygen transport system. | this study examined mechanisms underlying cardio-respiratory acclimation to moderate sustained hypoxia (6.0 kpa for 7 days at 22° c) in the bowfin amia calva, a facultative air-breathing fish. this level of hypoxia is slightly below the critical oxygen tension (pcrit ) of a. calva denied access to air (mean ± s.e. = 9.3 ± 1.0 kpa). before exposure to sustained hypoxia, a. calva with access to air increased air-breathing frequency on exposure to acute progressive hypoxia while a. calva without ac ... | 2014 | 24588643 |
| characterisation of putative oxygen chemoreceptors in bowfin (amia calva). | serotonin containing neuroepithelial cells (necs) are putative oxygen sensing cells found in different locations within the gills of fish. in this study we wished to determine the effect of sustained internal (blood) hypoxaemia versus external (aquatic) hypoxia on the size and density of necs in the first gill arch of bowfin (amia calva), a facultative air breather. we identified five different populations of serotonergic necs in this species (types i-v) based on location, presence of synaptic v ... | 2014 | 24744423 |
| the oldest ionoscopiform from china sheds new light on the early evolution of halecomorph fishes. | the halecomorphi are a major subdivision of the ray-finned fishes. although living halecomorphs are represented solely by the freshwater bowfin, amia calva, this clade has a rich fossil history, and the resolution of interrelationships among extinct members is central to the problem of understanding the origin of the teleostei, the largest clade of extant vertebrates. the ionoscopiformes are extinct marine halecomorphs that were inferred to have originated in the late jurassic of europe, and sub ... | 2014 | 24872460 |
| the development of a noncompetitive enzyme-linked immunosorbent assay for oncorhynchid growth hormone using monoclonal antibodies. | the development of a sensitive and specific two-site, or sandwich, noncompetitive enzyme-linked immunosorbent assay (elisa) for oncorhynchid growth hormone (gh) using monoclonal antibodies (mcas) is reported. the mcas were generated by the fusion of myeloma cells with spleen cells from mice that had been immunized with chum salmon (oncorhynchus keta) recombinant gh. the mcas specifically recognized the gh-secreting acidophils in the proximal pars distalis of immature male rainbow trout (oncorhyn ... | 1991 | 1879674 |
| neuropeptide y-related peptides from the pancreas of a teleostean (eel), holostean (bowfin) and elasmobranch (skate) fish. | homologous peptides belonging to the pancreatic polypeptide (pp) family were isolated from the pancreas of a teleostean fish, the american eel (anguilla rostrata), an holostean fish, the bowfin (amia calva) and an elasmobranch fish, the skate (raja rhina), and their primary structures were determined. the peptides show stronger homology to neuropeptide y, particularly in their cooh-terminal regions, than to peptide yy or pancreatic polypeptide and contain an alpha-amidated cooh-terminal tyrosine ... | 2010 | 2067973 |
| isolation, localization, and cardiovascular activity of tachykinins from the stomach of the bowfin amia calva. | the bowfin is an extant representative of an ancient group of ray-finned fish with evolutionary connections to modern teleosts. a peptide with substance p-like immunoreactivity was isolated from an extract of bowfin stomach and its primary structure was established as ser-lys-ser-his-gln-phe-tyr-gly-leu-met-nh2. this amino acid sequence resembles mammalian substance p only in the cooh-terminal region of the peptide. a second tachykinin with neurokinin a-like immunoreactivity isolated from the ex ... | 1995 | 7573557 |
| obtaining a more resolute teleost growth hormone phylogeny by the introduction of gaps in sequence alignment. | in order to obtain a more resolute phylogeny of teleosts based on growth hormone (gh) sequences, phylogenetic analyses were performed in which deletions (gaps), which appear to be order specific, were upheld to maintain gh's structural information. sequences were analyzed at 194 amino acid positions. in addition, the two closest genealogically related groups to the teleosts, amia calva and acipenser guldenstadti, were used as outgroups. modified sequence alignments were also analyzed to determin ... | 1995 | 7663758 |
| architecture of the integument in lower teleostomes: functional morphology and evolutionary implications. | a bony ganoid squamation is the plesiomorphic type in actinopterygians. during evolution, it was replaced by weak and more flexible elasmoid scales. we provide a comparative description of the integument of "ganoid" fishes and "nonganoid" fishes that considers all dermal components of mechanical significance (stratum compactum, morphology of ganoid scales, and their regional differences) in order to develop a functional understanding of the ganoid integument as a whole. data were obtained for th ... | 2002 | 12125067 |
| the effect of hypophysectomy on chloride balance in young-of-the-year bowfin, amia calva. | the effect of hypophysectomy on chloride balance was examined in young-of-the-year bowfin, amia calva. hypophysectomy resulted in decreased serum and total body chloride levels but not in serum and total body sodium levels. hypophysectomy resulted in decreased chloride influx with no effect on chloride efflux or sodium fluxes. prolactin therapy reversed the effect of hypophysectomy on electrolyte balance but caused a significant reduction in serum protein. | 2010 | 2881645 |
| evolution of behavior and neural control of the fast-start escape response. | the fast-start startle behavior is the primary mechanism of rapid escape in fishes and is a model system for examining neural circuit design and musculoskeletal function. to develop a dataset for evolutionary analysis of the startle response, the kinematics and muscle activity patterns of the fast-start were analyzed for four fish species at key branches in the phylogeny of vertebrates. three of these species (polypterus palmas, lepisosteus osseus, and amia calva) represent the base of the actin ... | 2002 | 12093034 |
| effect of air breathing on acid-base and ion regulation after exhaustive exercise and during low ph exposure in the bowfin, amia calva. | to explore a potential conflict between air breathing and acid-base regulation in the bowfin (amia calva), we examined how individuals with access to air differed from fish without air access in their response to acidosis. after exhaustive exercise, bowfin with access to air recovered significantly more slowly from the acidosis than fish without air access. while arterial blood ph (ph(a)) of fish without air access recovered to resting levels by 8 h, ph(a) was still significantly depressed in fi ... | 2013 | 11436134 |
| basal teleosts and the question of elopomorph monophyly. morphological and molecular approaches. | the methodology used by previous authors to resolve the relationships of the elopomorphan taxa is criticized. the morphological characters that have been proposed to support the monophyly of the elopomorpha are reviewed and it is shown that most of them are weak. a new hypothesis of relationships is proposed on the basis of nucleotidic sequences of ribosomal rna 18s, 16s and 12s. in order to really test all the possible relationships, the monophyly of the elopomorpha was not considered a priori. ... | 2001 | 11386087 |
| evolutionary history of the enolase gene family. | the enzyme enolase [ec 4.2.1.11] is found in all organisms, with vertebrates exhibiting tissue-specific isozymes encoded by three genes: alpha (alpha), beta (beta), and gamma (gamma) enolase. limited taxonomic sampling of enolase has obscured the timing of gene duplication events. to help clarify the evolutionary history of the gene family, cdnas were sequenced from six taxa representing major lineages of vertebrates: chiloscyllium punctatum (shark), amia calva (bowfin), salmo trutta (trout), la ... | 2000 | 11163970 |
| control of gill ventilation and air-breathing in the bowfin amia calva | the purpose of this study was to investigate the roles of branchial and gas bladder reflex pathways in the control of gill ventilation and air-breathing in the bowfin amia calva. we have previously determined that bowfin use two distinct air-breathing mechanisms to ventilate the gas bladder: type i air breaths are characterized by exhalation followed by inhalation, are stimulated by aquatic or aerial hypoxia and appear to regulate o2 gas exchange; type ii air breaths are characterized by inhalat ... | 1999 | 9841898 |
| mechanics of the fast-start: muscle function and the role of intramuscular pressure in the escape behavior of amia calva and polypterus palmas | the fast-start escape response is a rapid, powerful body motion used to generate high accelerations of the body in virtually all fishes. although the neurobiology and behavior of the fast-start are often studied, the patterns of muscle activity and muscle force production during escape are less well understood. we studied the fast-starts of two basal actinopterygian fishes (amia calva and polypterus palmas) to investigate the functional morphology of the fast-start and the role of intramuscular ... | 1998 | 9787124 |
| evidence for membrane-bound carbonic anhydrase in the air bladder of bowfin (amia calva), a primitive air-breathing fish. | the purpose of this study was to examine the subcellular distribution and isoenzyme characteristics of carbonic anhydrase from the gills and respiratory air bladder of bowfin amia calva, a primitive air-breathing fish. separation of subcellular fractions by differential centrifugation revealed that the vast majority of carbonic anhydrase from the gills of bowfin originated from the cytoplasmic fraction. washing of the gill microsomal pellet also indicated that the carbonic anhydrase originally a ... | 1998 | 9639594 |
| air-breathing during activity in the fishes amia calva and lepisosteus oculatus | many osteichthyan fishes obtain oxygen from both air, using a lung, and water, using gills. although it is commonly thought that fishes air-breathe to survive hypoxic aquatic habitats, other reasons may be more important in many species. this study was undertaken to determine the significance of air-breathing in two fish species while exercising in oxygen-rich water. oxygen consumption from air and water was measured during mild activity in bowfin (amia calva) and spotted gar (lepisosteus oculat ... | 1998 | 9487099 |
| neuroendocrine cells in the gills of the bowfin amia calva. an ultrastructural and immunocytochemical study. | neuroendocrine (ne) cells were localized by electron microscopy and immunocytochemistry in the gill epithelium of bowfin amia calva. the ne cells are dispersed in whole epithelium of the gill as solitary cells without intraepithelial innervation. all the observed ne cells do not reach the surface of the epithelium. the ne cells are characterized by a large nucleus with patches of condensed chromatin, numerous mitochondria, a well developed golgi apparatus and a few dense core vesicles of various ... | 1995 | 8612869 |
| isolation and biological activity of [trp5]bradykinin from the plasma of the phylogenetically ancient fish, the bowfin and the longnosed gar. | the holostean fish occupy an important position in vertebrate phylogeny as extant representatives of a ancient group of ray-finned fish with evolutionary connections to present-day teleosts. incubation of heat-denatured plasma from the bowfin amia calva with trypsin generated bradykinin-like immunoreactivity. the primary structure of bowfin bradykinin was established as ala-pro-pro-gly-trp-ser-pro-phe-arg. this amino acid sequence contains one amino acid substitution (phe5 --> trp) compared with ... | 1995 | 7651903 |
| topological analysis of the brainstem of the bowfin, amia calva. | this paper presents a survey of the cell masses in the brainstem of the generalized actinopterygian fish amia calva, based on transversely cut nissl-, klüver-barrera-, and bodian-stained serial sections. this study is intended to serve a double purpose. first it forms part of a now almost complete series of publications on the structure of the brainstem in representative species of all groups of vertebrates. within the framework of this comparative program the cell masses in the brainstem and th ... | 1994 | 8106657 |
| a comparative analysis of somatolactin-related immunoreactivity in the pituitaries of four neopterygian fishes and one chondrostean fish: an immunohistochemical study. | an antiserum to cod somatolactin (sl) was used for immunohistochemical screening for the pars intermedia of two teleosts (oreochromis mossambicus and gymothorax meleagris), two holostean fishes (lepisosteus osseus and amia calva), and a chondrostean fish (acipenser fulvescens) for sl-immunopositive (sl-ir) cells. as expected, a subset of the epithelial cells in the pars intermedia of o. mossambicus (tilapia) was immunopositive for sl, and the remainder of the epithelial cells was immunopositive ... | 1996 | 8860312 |
| prosomatostatin-i is processed to somatostatin-26 and somatostatin-14 in the pancreas of the bowfin, amia calva. | with the exception of the agnatha (lampreys and hagfishes), somatostatin-14 is the predominant molecular form of somatostatin in the pancreas of species from all classes of vertebrates yet studied. the pancreas of the holostean fish, amia calva (bowfin; order amiiformes) contained somatostatin-like immunoreactivity that was resolved by reversed phase hplc in two components. the primary structure of the more abundant peptide (somatostatin-26) was established as: ser-ala-asn-pro-ala5-leu-ala-pro-a ... | 1993 | 8105513 |
| isolation of prolactin and growth hormone from the pituitary of the holostean fish amia calva. | pituitaries from adult male and female amia calva (order holostei) were acid extracted and fractionated by gel filtration column chromatography and reversed-phase high performance liquid chromatography. this two-step isolation procedure yielded homogeneous pools of amia prolaction (prl) and growth hormone (gh). the amino acid composition of both purified polypeptides was determined. primary sequence analysis of the first 22 positions at the n-terminal of amia prl revealed that this region has 63 ... | 1993 | 8224761 |
| neuromuscular control of the glottis in a primitive air-breathing fish, amia calva. | the neuromuscular control of the glottis, a muscular sphincter that controls air flow to and from the swim bladder, was investigated using in vitro preparations from bowfin (amia calva). stimulation of the ramus intestinalis branch of the vagus nerve caused an increase in isometric tension of the glottal musculature, indicating active closure. the glottis could be actively opened only by direct stimulation of muscle bundles lying lateral to the glottis. in 19 of 24 preparations supramaximal nerv ... | 1993 | 8430880 |
| short-term effects of triiodothyronine on the bowfin, amia calva (holostei), and the lake char, salvelinus namaycush (teleostei). | to assess the role of triiodothyronine (t3) in mediating short-term changes in metabolism, such as those occurring in circadian patterns, we examined the effects of intraperitoneal injection of t3 on the oxidation of substrates by isolated mitochondria from liver of the bowfin, amia calva, and red muscle and liver of the lake char, salvelinus namaycush. selected enzymes were measured in red muscle and liver of the lake char. three hours after intraperitoneal injection of t3, oxidation of some su ... | 1992 | 1729381 |
| retinal projections in the bowfin, amia calva: cytoarchitectonic and experimental analysis. | the retinofugal projections in the bowfin, a non-teleost actinopterygian, were studied by autoradiographic and horseradish peroxidase methods, and the cytoarchitecture of retinorecipient regions of the diencephalon was analyzed with serially sectioned, bodian stained material. nuclei were identified in the thalamus, the periventricular portion of the posterior tuberculum, synencephalon, and pretectum which are homologous to like-named nuclei in teleosts and other non-teleost actinopterygian fish ... | 1992 | 1511265 |
| glutamine metabolism in a holostean (amia calva) and teleost fish (salvelinus namaycush). | amino acid metabolism was examined in mitochondria from the lateral red muscle of a teleost (lake char, salvelinus namaycush) and a nonteleost fish (bowfin, amia calva). isolated mitochondria oxidize a wide variety of substrates and have high respiratory control ratios. in both species, glutamine is oxidized more rapidly than any other amino acid. the rate of glutamine oxidation by bowfin mitochondria exceeds that of lake char mitochondria, and the bowfin displays correspondingly higher levels o ... | 1991 | 1671542 |
| ventilatory control in a primitive fish: signal conditioning via non-linear o2 affinity. | gas exchange in the gills of the air-breathing fish amia calva was modelled to determine how the gills modify fluctuations in venous p o2. these fluctuations form the physiological signal for aerial ventilation in these fish. this study was performed to examine the signal conditioning role that the gills may play in the control system that regulates p o2. the model incorporated a non-linear hb-o2 affinity relationship. fluctuations in venous p o2 were modelled as sinusoids, covering a range of f ... | 1996 | 8833548 |
| does amia calva aestivate? | during gradual air exposure, amia calva show no reduction in oxygen consumption, no increase in plasma urea levels or in urea excretion. blood ph remains constant, and plasma total co2, pco 2, hco3 (-). total ammonia and nh3 concentrations all rise significantly. exposure to 923 μmol/l nh4cl does not elicit an increase in urea production or airbreathing. aquatic hypoxia without access to air does not cause a reduction in aerobic metabolism, and moderate levels result in death. these results sugg ... | 1990 | 24221948 |
| detection of met-enkephalin and leu-enkephalin in the posterior pituitary of the holostean fish, amia calva. | immunohistochemical analysis of the pituitary of the holostean fish, amia calva, indicated that enkephalin-related immunoreactivity was restricted to the pars nervosa, and was not detected in other regions of the pituitary. fractionation of acid extracts of posterior pituitaries by reverse phase hplc followed by ria analysis indicated the presence of immunoreactive met-enkephalin and leu-enkephalin. no immunoreactive forms were detected with rias specific for either met-enkephalin-rf or met-enke ... | 2007 | 2608557 |
| angiotensin i- and ii- and norepinephrine-mediated pressor responses in an ancient holostean fish, the bowfin (amia calva). | dorsal aortic blood pressure (psys, systolic; pdias, diastolic; and pda, mean) and heart rate (hr) were measured in resting freshwater bowfins (n = 6), amia calva l., before and after i.v. injections of 50, 100, 200, 500, and 1000 ng.kg-1 of synthetic [asn1, val5]-angiotensin ii (ang ii). baseline psys, pdias, and pda were 27.7 +/- 2.8, 22.4 +/- 1.8, and 24.5 +/- 2 mm hg, respectively. bowfins were only moderately responsive to ang ii in a stepwise manner and the increase in blood pressure becam ... | 1995 | 7628688 |
| cdna sequences and organization of igm heavy chain genes in two holostean fish. | immunoglobulin m heavy chain (mu) sequences of two holostean fish, the bowfin, amia calva, and the longnose gar, lepisosteus osseus, were amplified from spleen mrna by race-pcr, cloned, and sequenced. each mu chain showed the conserved four constant domain structure typical of a secreted mu chain. southern blot analyses with specific heavy chain variable (vh) and constant (ch) region probes suggest that both fish possess an igh locus that resembles that of the teleosts, amphibians, and mammals i ... | 2007 | 7556802 |
| detecting small amounts of gene flow from phylogenies of alleles. | the method of coalescents is used to find the probability that none of the ancestors of alleles sampled from a population are immigrants. if that is the case for samples from two or more populations, then there would be concordance between the phylogenies of those alleles and the geographic locations from which they are drawn. this type of concordance has been found in several studies of mitochondrial dna from natural populations. it is shown that if the number of sequences sampled from each pop ... | 1989 | 2714639 |
| morphology of the kidney of adult bowfin, amia calva, with emphasis on "renal chloride cells" in the tubule. | the nephron of adult bowfin, amia calva, was described using light and electron microscopic techniques. the kidney of the bowfin possesses an abundant supply of renal corpuscles with each consisting of a glomerulus and a bowman's capsule of visceral (podocyte) and parietal layers. no juxtaglomerular apparatus is present. the epithelium of the tubule is continuous with the parietal epithelium and is divisible in descending order into neck, first proximal, second proximal, first distal, second dis ... | 1988 | 3385773 |
| exploring the evolutionary history of melanin-concentrating and melanin-stimulating hormone receptors on melanophores: neopterygian (holostean) and chondrostean fishes. | the occurrence of melanin-concentrating hormone (mch) receptors on integumental melanophores was found to extend back in the evolutionary line of ray-finned bony fishes (actinopterygii) to the group ancestral to modern teleosts, the holostei. the two species of holosteans studied, amia calva and lepisosteus platyrhincus, exhibited changes of melanophore index (melanosome aggregation), indicating responses to mch and to melatonin but no response to norepinephrine (ne). polyodon spathula, a specie ... | 1988 | 3237601 |
| forms of immunoreactive beta-endorphin in the intermediate pituitary of the holostean fish, amia calva. | acid extracts of the intermediate pituitary of the holostean fish, amia calva, were fractionated by gel filtration chromatography and analyzed with radioimmunoassays specific for n-acetylated beta-endorphin and c-terminally amidated alpha-msh. in these extracts beta-endorphin-related immunoreactive material and alpha-msh-related immunoreactive material were present in roughly equimolar amounts. the immunoreactive beta-endorphin-sized material was tested for opiate receptor binding activity using ... | 2014 | 2966346 |
| acanthocephala from lake fishes in wisconsin: ecology and host relationships of pomphorhynchus bulbocolli (pomphorhynchidae). | pomphorhynchus bulbocolli linkins in van cleave, 1919, was considerably more common in fishes of the river-connected tichigan lake than of the landlocked silver lake, southeastern wisconsin. it is reported from 17 species of principal, accessory, and occasional definitive hosts (new record in moxostoma carinatum) and from 13 species of paratenic hosts (new records in amia calva, ictalurus punctatus, lepomis cyanellus, and pomoxis nigromaculatus). infection patterns were influenced by fish specie ... | 1987 | 3585622 |
| molecular zoogeography of freshwater fishes in the southeastern united states. | restriction fragment length polymorphisms in mitochondrial dna (mtdna) were used to reconstruct evolutionary relationships of conspecific populations in four species of freshwater fish-amia calva, lepomis punctatus, l. gulosus, and l. microlophus. a suite of 14-17 endonucleases was employed to assay mtdnas from 305 specimens collected from 14 river drainages extending from south carolina to louisiana. extensive mtdna polymorphism was observed within each assayed species. in both phenograms and w ... | 1986 | 17246340 |
| cellular mechanisms for color-coding in holostean retinas and the evolution of color vision. | electrophysiological recording and microspectrophotometry were used to analyze retinal function in representatives of the two surviving genera of holostean grade fish--the bowfin (amia calva) and gars (lepisosteus sp.). the properties of the cone photopigments, horizontal cells and ganglion cells show that these holostean retinas have cellular mechanisms for color vision which are fundamentally similar to those previously described for teleosts, turtle and mammals. these findings suggest that tr ... | 1983 | 6649420 |
| yolk-platelet crystals in three ancient bony fishes: polypterus bichir (polypteri), amia calva l., and lepisosteus osseus (l.) (holostei). | yolk-platelet crystals in amia calva l., lepisosteus osseus (l.) and polypterus bichir have orthorhombic features with unit-cell dimensions a = 8.3 ... 8.8 nm, b = 16.4 ... 16.9 nm and c = 18.6 ... 19.8 nm as determined in electron-diffracted patterns of fixed, epoxy-resin embedded and thin-sectioned material. electron-diffraction patterns, crystal projections and the above unit-cell data make them extremely similar to the orthorhombic yolk-platelet crystals known for amphibians and teleosts. th ... | 1982 | 7199387 |
| central projections of the lateral line and eighth nerves in the bowfin, amia calva. | the first-order connections of the anterior and posterior lateral line nerves and of the eighth nerve were determined in the bowfin, amia calva, using experimental degeneration and anterograde hrp transport techniques. the termination sites of these nerves define a dorsal lateralis cell column and a ventral octavus cell column. the anterior and posterior lateralis nerves distribute ipsilaterally to two medullary nuclei-nucleus medialis and nucleus caudalis. nucleus medialis comprises the rostral ... | 1981 | 6164698 |
| 'twisted plywood' structure and mineralization in the scales of a primitive living fish amia calva. | the basal plate of the scales of amia calva is composed of regular double twisted plywood, as in latimeria and dipnoan scales. however, the progressive rotation of the fibrils direction is left-handed in amia and right-handed in the 'sarcopterygians'. so, the similarity between these peculiar plywoods is probably the result of convergence. the basal plate of amia scales is incompletely mineralized. there are numerous calcified ovoid corpuscles which look very like the mandl's corpuscles of teleo ... | 1981 | 7222010 |
| identification and distribution of the adrenocortical homolog, chromaffin tissue, and corpuscles of stannius in amia calva l. | | 1976 | 955381 |
| the hemoglobin system of the primitive fish, amia calva: isolation and functional characterization of the individual hemoglobin components. | blood from the primitive holostean fish, the bowfin, amia calva, contains 2 mo of atp per mol of hemoglobin. the hemolysates contain at least five tetrameric hemoglobin components which differ in their oxygen affinities and their response to cofactors such as atp. the binding of oxygen by each chromatographically isolated component, including a cathodal component, is influenced by ph and organic phosphates; there is no significant differentiation of function or structure as seen in trout and cer ... | 1976 | 938661 |
| structure of the nongranulated cells in the hypophyseal rostral pars distalis of cyclostomes and actinopterygians. | the structure of the nongranulated cells in the sea lamprey adenohypophysis and similar cells of the rostral pars distalis in a number of actinopterygian fishes was examined with the aim of determining the role(s) of these cells in pituitary function. a number of possible roles are proposed for the nongranulated cells. in salmonids and amia calva the cells may be involved in the active movement of material into or from the follicle lumina. the structure of the nongranulated cells in in vitro cul ... | 1976 | 946165 |
| accommodative lens movement in holosteans (amia calva and lepisosteus osseus oxyrus) and in the sea lamprey (petromyzon marinus). | | 1975 | 1131748 |
| a new approach for determining the volume of cerebral cellular fluid and demonstration of its communication with c.s.f. | 1. a new technique is presented for determining the volume of extracellular space in bowfin (amia calva) brain during in vitro incubation. it consists of solving simultaneous equations which are applied to determine the volume of extracellular space as well as intracellular marker concentration. this technique allows for a better insight into the redistribution of marker between incubation medium and extracellular space as well as between extracellular and intracellular space.2. na(+), k(+) and ... | 1971 | 5124573 |
| the median eminence of the bowfin, amia calva l. | | 1970 | 5500427 |
| [gonads of the young amia calva]. | | 1955 | 13249714 |
| the cranial osteology of amia calva. | | 1877 | 17231169 |
| respiration in a primitive air breather, amia calva. | | 1970 | 5450342 |
| development of cellular dentin and lepidosteal tubules in the bowfin, amia calva. | | 1964 | 14250382 |
| immunohistochemical localization of urotensin i/corticotropin-releasing factor, urotensin ii, and serotonin immunoreactivities in the caudal spinal cord of nonteleost fishes. | neurosecretory cells in the caudal spinal cord of fishes were first discovered in elasmobranches. however, most of the subsequent work on the caudal neurosecretory system has emphasized its morphology and function in teleosts. two major peptides, urotensins i and ii (ui and uii), have been isolated from this system in teleosts and their amino acid sequences have been determined. we have used immunohistochemical techniques to confirm and expand previous morphological and pharmacological findings ... | 1986 | 3525617 |
| steroidogenesis in the yellow corpuscles (adrenocortical homolog) in a holostean fish, the bowfin, amia calva l. | yellow corpuscles from the ventral surface of the anterior kidney in bowfins (amia calva l.) converted [7-3h]pregnenolone to radioactive 11-deoxycortisol, cortisol, and corticosterone in vitro. aldosterone was not detected. cortisol was the predominant steroid at the end of a 3-hr incubation period (20 degrees c). these experiments are the first to demonstrate steroidogenesis in holostean yellow bodies and they are the first incubations with pure adrenocortical tissue, free of head kidney, in an ... | 1986 | 3770446 |
| the muscular basis of aerial ventilation of the primitive lung of amia calva. | anatomical analysis, electromyography, pressure recordings, high-speed x-ray and light movies of the mechanism of air ventilation in amia calva reveal that aerial ventilation proceeds by the action of a specialized pulse pump. the interhyoideus muscle is the dominant muscle being active during both the preparatory phase and the final, prolonged compressive phase during which new air is forced into the lung. amia retains a relatively large residual volume in the lung and does not repeat inhalatio ... | 1985 | 3983487 |
| structure and innervation of the inner ear of the bowfin, amia calva. | | 1983 | 6833529 |