| a comparison of the ultrastructure and opsin immunocytochemistry of the pineal organ and retina of the deep-sea fish chimaera monstrosa. | the pineal organ and retina of the rat-fish chimaera monstrosa were compared by electron microscopy and immunocytochemistry using antisera against colour-specific opsins and paying special attention to pineal csf-contacting neurons and retinal landolt's clubs. in the retina, a large number of landolt's clubs and two types of rod-like photoreceptors were found. the outer segments of the numerous electron-dense "tall rods" displayed strong immunoreactivity with the monoclonal os-2 antibodies--firs ... | 1990 | 2142101 |
| electronmicroscopical, immunohistochemical, immunocytochemical and biological evidence for the occurrence of cardiac hormones (anp/cdd) in chondrichthyes. | as representatives of the vertebrate class of chondrichthyes the plagostomian species squalus acanthias, scyliorhinus canicula and raja clavata as well as the holocephalan species chimaera monstrosa were investigated for the presence of cardiac hormones of the atrial natriuretic polypeptide/cardiodilatin- (anp/cdd-) family. anp/cdd-immunoreactive cells were detected in the atria and the ventricles of all species studied. while these cells failed to react with antisera raised against the n-termin ... | 1987 | 2961715 |
| isolation and structural characterization of insulin from the holocephalan fish, chimaera monstrosa (rabbit fish). | insulin has been isolated from the pancreas of the holocephalan fish, chimaera monstrosa (rabbit fish), and characterized by automated edman degradation and fast atom bombardment mass spectrometry. the primary structure of rabbit fish insulin was identical to that of insulin from the holocephalan fish, hydrolagus colliei (pacific ratfish), and contained 21 residues in the a-chain and 38 residues in the b-chain. the amino acid compositions of both rabbit fish and ratfish insulins demonstrated a v ... | 1988 | 3053327 |
| comparative studies of bile salts. 5 alpha-chimaerol, a new bile alcohol from the white sucker catostomus commersoni lacépède. | 1. g.l.c. examination of bile alcohols prepared from the sucker catostomus commersoni lacépède (family catostomidae) showed that although 5alpha-cyprinol (5alpha-cholestane-3alpha,7alpha,12alpha,26,27-pentol) was a minor constituent, the principal bile alcohol was an undescribed substance, probably present in the bile as the c-26 sulphate ester, whose i.r., n.m.r. and mass spectra agreed with the structure 5alpha-cholestane-3alpha,7alpha,12alpha,24,26-pentol. 2. m(d) studies suggest that this 5a ... | 1970 | 5435487 |
| evolutionary studies on pancreatic colipase. | in this evolutionary study the following criteria have been used to prove the existence of colipase: 1. it restores the activity of human and porcine pancreatic lipase inhibited by bile salt. 2. it cross-reacts with antisera to human and porcine colipases. 3. its restoration of lipase activity, inhibited by bile salt, in the tributyrin assay system, is prevented by antiserum to colipase. 4. it is a heat-stable, low-molecular-weight protein (molecular weight about 10 000 by gel-filtration). the o ... | 1983 | 6860687 |
| first evidence of the presence of microtriches in the gyrocotylidea. | the gyrocotylidea, a small and enigmatic group of intestinal parasites of chimaeras, has been considered to be related either to the monogenea, or, more frequently, to the most primitive monozoic tapeworms (cestoda), i.e., the amphilinidea and caryophyllidea. the present study, based on transmission electron microscopical observations of a species of gyrocotyle from the rabbit fish, chimaera monstrosa, in the north atlantic, demonstrates for the first time the presence of microtriches as surface ... | 2006 | 16995385 |
| gnrh immunodetection in the brain of the holocephalan fish chimaera monstrosa l.: correlation to oocyte maturation. | chimera monstrosa (rabbit fish) like other holocephalans is a rare, delicate deep sea fish. owing to the difficulty of sampling individuals in good shape, there is a paucity of information available on the morphology and physiology of this species especially concerning reproduction. in holocephalans, a hypothalamus-pituitary-gonadal axis has been postulated and a gnrh molecule identical to cgnrh ii has been identified. the aim of the present study was to correlate the presence of steroidogenic e ... | 2008 | 18400222 |
| ultrastructure of the neodermal sclerites of gyrocotyle urna grube and wagener, 1852 (gyrocotylidea, cestoda). | body sclerites of gyrocotyle urna grube and wagener, 1852, parasites of chimaera monstrosa l., were studied by transmission electron microscopy. each sclerite consists of ten to 15 concentric layers varying in electron density and thickness. the sclerites insert in pockets whose epithelia are continuous with the body neodermis but are 14 times thinner. the pocket neodermis bears surface projections with an inner electron-dense cylinder and a small electron-dense cap at their tip. it is surrounde ... | 2009 | 19697062 |
| ultrastructure of the ovarian follicles, oviducts and oocytes of gyrocotyle urna (neodermata: gyrocotylidea). | an ultrastructural study of the ovarian follicles and their associated oviducts of the cestode gyrocotyle urna grube et wagener, 1852, a parasite from the spiral valve of the rabbit fish, chimaera monstrosa l., was undertaken. each follicle gives rise to follicular oviduct, which opens into one of the five collecting ducts, through which pass mature oocytes. these collecting ducts open into an ovarian receptacle which, in turn, opens via a muscular sphincter (the oocapt) to the main oviduct. the ... | 2010 | 20941909 |
| biologically active lipids. semi-synthesis of 3h-labeled ether glycerophospholipids and ether glyceroglycolipids from ratfish liver oil. | 1-o-alkyl-2,3-diacyl-sn-glycerols, the major constituents of ratfish (chimaera monstrosa) liver oil, serve as starting material for the preparation of 1-o-alkyl-sn-glycero-3-phosphocholines, 1-o-alkyl-2-acetyl-sn-glycero-3-phosphocholines, 1-o-alkyl-2-o-methyl-sn-glycero-3-phosphocholines, and 1-o-alkyl-2-o-methyl-sn-glycero-3-beta-d-glucopyranosides. catalytic tritiation of the unsaturated alkyl moieties in these biologically active ether lipids affords the corresponding 3h-labeled substances. | 2012 | 3609315 |
| [presence of a preoptic nucleus in the diencephalon of chimaera monstrosa linné]. | | 2016 | 4995267 |
| [cytoarchitecture of the vitellaria of two monogenean species, parasites of the holocephalan fish chimaera monstrosa l. with analysis of vitelline structure in the neodermata]. | the ultrastructural features of the vitelline follicles of ectoparasitic monogenean chimaericola leptogaster leuckart, 1830 (polyopisthocotylidea, chimaericolidae) and endoparasitic calicotyle affinis scott, 1911 (monopisthocotylidea, monocotylidae), parasites of the gills and cloaca of a holocephalan fish, chimaera monstrosa l., are described. the vitelline follicles of the studied monogenean species are composed of the cells of a single type, vitellocytes at various stages of development. spec ... | 2015 | 25702500 |
| ultrastructural characteristics of the caeca of basal polyopisthocotylean monogeneans of the families chimaericolidae and hexabothriidae parasitic on cartilaginous fishes. | ultrastructural differences are shown between the caecal organization in three blood-feeding polyopisthocotylean monogeneans, i.e., the chimaericolid chimaericola leptogaster from the holocephalan chimaera monstrosa and two hexabothriids, callorhynchocotyle callorhynchi from the holocephalan callorhynchus capensis and rajonchocotyle emarginata from the elasmobranch amblyraja radiata. in c. leptogaster, digestive cells and connecting syncytium, joined close to the luminal surface by septate junct ... | 2015 | 25869960 |
| ultrastructure of the anterior organ and posterior funnel-shaped canal of gyrocotyle urna wagener, 1852 (cestoda: gyrocotylidea). | using scanning and transmission electron microscopy, ultrastructure of the anterior organ and posterior funnel-shaped canal of gyrocotyle urna wagener, 1852 (cestoda: gyrocotylidea) from ratfish, chimaera monstrosa (holocephali), was studied for the first time. the proper anterior organ is localised at a short distance (about 170 µm) from an apical pore surrounded by a receptor field, whereas its distal end is marked by a muscular sphincter. the tegumental surface of this organ is covered with s ... | 2015 | 26040290 |
| isotopic discrimination of stable isotopes of nitrogen (δ15n) and carbon (δ13c) in a host-specific holocephalan tapeworm. | during the past decade, parasites have been considered important components of their ecosystems since they can modify food-web structures and functioning. one constraint to the inclusion of parasites in food-web models is the scarcity of available information on their feeding habits and host-parasite relationships. the stable isotope approach is suggested as a useful methodology to determine the trophic position and feeding habits of parasites. however, the isotopic approach is limited by the la ... | 2014 | 23452719 |
| first detection of taste buds in a chimaeroid fish (chondrichthyes: holocephali) and their gαi-like immunoreactivity. | the mucosa covering the tongue of the chimaera monstrosa has been investigated with histological and immunohistochemical methods allowing to describe, for the first time, gustatory structures (taste buds) in this subclass of cartilaginous fish. g-protein-alpha-subunit-inhibitory-like (gαi-like) immunoreactivity has been detected in the taste buds of c. monstrosa, as described in other vertebrates. in order to gain confidence on the antiserum used, able to recognize three gαi proteins in mammals, ... | 2012 | 22543113 |
| g protein alpha subunits in the olfactory epithelium of the holocephalan fish chimaera monstrosa. | receptor neurons in the olfactory and vomeronasal epithelia of vertebrates have dendritic specialization that is correlated to the receptor gene family they express and the g protein coupled with that receptor (in particular the g protein alpha subunit). there are not very many data in the literature about the morphological and molecular features of the olfactory epithelium of chondrichthyes. in this work, the presence and distribution of different types of g protein alpha subunits (galpha(o), g ... | 2010 | 20122993 |
| first description of a palatal organ in chimaera monstrosa (chondrichthyes, holocephali). | chimaeroid fishes are the only extant holocephali, a subclass of chondrichthyes. we describe for the first time a well evidenced structure localized in the palate of the chimaeroid chimaera monstrosa, here named a palatal organ (po). attention has been paid to the holocephalan head morphology, but there has been no mention of this particular organ in the literature. the po is a soft-tissue mass located within a slight hollow in between the two vomerine toothplates, and it protrudes into the oral ... | 2016 | 26474720 |
| structure and vascularization of the ventricular myocardium in holocephali: their evolutionary significance. | it was generally assumed that the ventricle of the primitive vertebrate heart was composed of trabeculated, or spongy, myocardium, supplied by oxygen-poor luminal blood. in addition, it was presumed that the mixed ventricular myocardium, consisting of a compacta and a spongiosa, and its supply through coronary arteries appeared several times throughout fish evolution. recent work has suggested, however, that a fully vascularized, mixed myocardium may be the primitive condition in gnathostomes. t ... | 2015 | 25994124 |
| bipteria vetusta n. sp. – an old parasite in an old host: tracing the origin of myxosporean parasitism in vertebrates. | myxosporea (myxozoa), a group of parasitic cnidaria, use mostly bony fishes (teleostei) as intermediate hosts; however, they can also parasitize other vertebrates such as cartilaginous fish (chondrichthyes). molecular data of myxosporeans from sharks and rays (elasmobranchii) revealed these parasites to be one of the most basal representatives in the myxosporean phylogenetic tree, suggesting their ancient evolutionary history. a new myxosporean species, bipteria vetusta n. sp., was found in the ... | 2015 | 25659495 |
| functional nasal morphology of chimaerid fishes. | holocephalans (chimaeras) are a group of marine fishes comprising three families: the callorhinchidae (callorhinchid fishes), the rhinochimaeridae (rhinochimaerid fishes) and the chimaeridae (chimaerid fishes). we have used x-ray microcomputed tomography and magnetic resonance imaging to characterise in detail the nasal anatomy of three species of chimaerid fishes: chimaera monstrosa, c. phantasma and hydrolagus colliei. we have shown that the nasal chamber of these three species is linked to th ... | 2013 | 23630172 |
| ratfish (chimaera) spine injuries in fishermen. | an occupational hazard peculiar to fishermen, is an injury from a sharp fish spine. such spines can cause envenomation injury, infectious sequelae or trauma to anatomical structures. the management of two fishermen with penetrating ratfish (chimaera) spine injuries to the lower limb is described. both were managed by removal of the spine under general anaesthesia. in the second patient, the spine was embedded adjacent to the left femoral artery, highlighting the potential for major haemorrhage a ... | 2011 | 21873722 |
| chimaera opalescens n. sp., a new chimaeroid (chondrichthyes: holocephali) from the north-eastern atlantic ocean. | a new species of chimaeroid, chimaera opalescens n. sp., was described from 31 type specimens caught in the north-eastern atlantic ocean at 950-1400 m depth. this species differed from all its congeners by the combination of the following characters: body uniformly pale brown to bronze, iridescent on fresh specimens; unpaired fins brown to purple, uniformly coloured or with pale or whitish edges; iris black; claspers tripartite and divided for a third of their length, not extending beyond the pe ... | 2011 | 21781099 |
| intimal thickening of coronary arteries in the rabbitfish, chimaera monstrosa l. (chondrichthyes: holocephali). | this study is the first to report the occurrence of intimal thickening of coronary arteries in a holocephalan, namely the rabbitfish, chimaera monstrosa. the sample studied consisted of five hearts from rabbitfish with body weights ranging between 12 g and 1116 g. the specimens were fixed in formalin, in methanol:acetone:water (maw), or in paraformaldehyde and were examined by brightfield and polarization light microscopy. coronary arteries from three larger animals displayed focal intimal thick ... | 2010 | 20572901 |
| the myoseptal system in chimaera monstrosa: collagenous fiber architecture and its evolution in the gnathostome stem lineage. | recent studies have revealed the 3d morphology and collagen fiber architecture of myosepta in teleostome fishes. here we present the first data set on the myoseptal structure of a representative of the chondrichthyan clade. we investigate the series of myosepta in the ratfish chimaera monstrosa (holocephali) from the anterior to the posterior body using microdissections of cleared and stained specimens, polarized light microscopy of excised myosepta, and histology. the features of the myoseptal ... | 2004 | 16351925 |
| total and methylmercury residues in cartilaginous fish from mediterranean sea. | concentrations of mercury and methylmercury residues were determined in the muscle tissue of three cartilaginous fishes chimaera monstrosa (ghostshark), torpedo nobiliana (electric ray) and myliobatis aquila (eagle ray) from the mediterranean sea. the highest mean levels of total mercury were detected in ghostshark (3.14 mg/kg wet weight), followed by electric ray (2.42 mg/kg wet weight), and eagle ray (0.83 mg/kg wet weight). such a variability is influenced by quite a number of factors, among ... | 2002 | 12523539 |
| [ratfish (chimaera monstrosa) sting]. | a fisherman was accidentally stung on his right calf by the spine of a ratfish (chimaera monstrosa). adjacent to the wound was a swelling, with a bluish skin colour the first day. the fisherman experienced an immediate burning pain and during the following days developed numbness of the calf and the back of the thigh. he needed crutches for three weeks, and the symptoms lasted for nine weeks. the treatment consists of rinsing the wound and removing foreign material, and submerging the afflicted ... | 1991 | 1871743 |
| immunocytochemical studies on the pancreatic islets of the ratfish chimaera monstrosa. | the islet cells and nerves in the pancreas of the ratfish chimaera monstrosa were examined immunocytochemically by using antisera against mammalian brain-gut peptides. five types of islet cells were recognized. the b and d cells reacted to anti-insulin and anti-somatostatin sera, respectively. the a and x cells exhibited glucagon-like immunoreactivities. the n-terminal anti-glucagon serum reacted both to the a and the x cells, while the c-terminal anti-glucagon serum bound specifically to the x ... | 1986 | 3541842 |
| the ultrastructure of cerebral blood capillaries in the ratfish, chimaera monstrosa. | sharks and skates (chondrichthyes: elasmobranchii) have a glial blood-brain barrier, while all other vertebrates examined so far have an endothelial barrier. for comparative reasons it is desirable to examine the blood-brain barrier in species from the other subclass of cartilaginous fish, the holocephalans. the ultrastructure of cerebral capillaries in the chimaera (chondrichthyes: holocephali) is described in the present study. the endothelial cells are remarkably thick. fenestrae and transend ... | 1982 | 7127416 |
| ultrastructure of the lateral-line sense organs of the ratfish, chimaera monstrosa. | the ultrastructure of the lateral-line neuromasts in the ratfish, chimaera monstrosa is described. the neuromasts rest at the bottom of open grooves and consist of sensory, supporting, basal and mantle cells. each sensory cell is equipped with sensory hairs consisting of a single kinocilium and several stereocilia. there are several types of sensory hair arrangement, and cells with a particular arrangement from patches within the neuromast. there are two types of afferent synapse. the most commo ... | 1981 | 7214501 |
| the cardiac ultrastructure of chimaera monstrosa l. (elasmobranchii: holocephali). | the ultrastructure of the heart in chimaera monstrosa l. is described. the endocardial and the epicardial cells are similar in the three cardiac regions. myocardial cells show small variations. the myofibred, 4--6 microns thick, contains one or a few myofibrils. each myosin filament is surrounded by six actin filaments. the sarcomere banding pattern includes the z-, a-, i-, m-, n-, and h-band. end-to-end attachments between myofibres are composed of alternating desmosomes and fasciae adhaerentes ... | 1979 | 509479 |
| observations on the chemical composition and toxicity of ratfish (chimaera monstrosa). | | 1971 | 5118361 |
| [histology of the hypothalamo-hypophyseal system in chimaera monstrosa linne (holocephali)]. | | 1971 | 5170227 |
| [histology of ultimobranchial bodies of chimaera monstrosa]. | | 2003 | 4192585 |
| gyrocotyle in chimaera monstrosa from oslo fjord, with emphasis on its mode of attachment and regulation of the degree of infection. | | 1967 | 5583358 |
| [purkinje cell bodies in the stratum moleculare of chimaera monstrosa]. | | 1967 | 5592265 |
| [the ependyma of the cerebral ventricle of chimaera monstrosa (with special reference to the organon vasculosum praeopticum)]. | | 1963 | 14047107 |
| comparative studies on 'bile salts'. 17. a bile alcohol from chimaera monstrosa. | | 1963 | 14015416 |
| [on the mesencephalo-hypophyseal system of chimaera monstrosa]. | | 1963 | 13960123 |
| [on the islet system of the pancreas of chimaera monstrosa]. | | 1962 | 13960121 |