| spermiogenesis of eusepia officinalis (l.), loligo forbesi (steenstrup) and alloteuthis subulata (l.) (cephalopoda, decapoda). | | 1975 | 1781 |
| evidence that glutamate mediates axon-to-schwann cell signaling in the squid. | high-frequency stimulation (100 hz) of isolated giant axons of the small squid alloteuthis subulata and the large squid loligo forbesi caused the periaxonal schwann cell resting potential (em = -40 mv) to hyperpolarize up to 11 mv in direct proportion to train duration and action potential amplitude. in both species, the schwann cell also hyperpolarized up to 17 mv with the application of l-glutamate (10(-9) to 10(-6) m), in a dose-dependent manner. by contrast, in the presence of 10(-8) m d-tub ... | 1989 | 2566579 |
| potassium homeostasis in the nervous system of cephalopods and crustacea. | 1. previous work has shown that nerve activity is associated with a significant release of potassium in the vicinity of the axonal membrane. several mechanisms are normally present which reduce k+ accumulation in the extra-axonal space. 2. in intact connectives of the crayfish, procambarus clarkii, repetitive stimulation of the giant axons was associated with an apparent hyperpolarization measured by an interstitial microelectrode, which most probably corresponds to depolarization of the inner f ... | 1987 | 3503934 |
| the molecular basis of a spectral shift in the rhodopsins of two species of squid from different photic environments. | the molecular basis of spectral tuning of rhodopsin pigments in two squid species is examined. the absorbance spectra of rhodopsin extracts from alloteuthis subulata (lambda max 499 nm) showed a 5 nm red shift compared with loligo forbesi (lambda max 494 nm). the rhodopsin gene sequence of a. subulata opsin was determined from polymerase chain reaction (pcr) amplified fragments by using genomic dna as template. the deduced amino acid sequence was compared with that obtained from the previously p ... | 1993 | 8108455 |
| differential sensitivity to calciseptine of l-type ca(2+) currents in a 'lower' vertebrate (scyliorhinus canicula), a protochordate (branchiostoma lanceolatum) and an invertebrate (alloteuthis subulata). | voltage-dependent calcium currents in vertebrate (scyliorhinus canicula), protochordate (branchiostoma lanceolatum), and invertebrate (alloteuthis subulata) skeletal and striated muscle were examined under whole-cell voltage clamp. nifedipine (10 microm) suppressed and cobalt (5 mm) blocked striated/skeletal muscle calcium currents in all of the animals examined, confirming that they are of the l-type class. calciseptine, a specific blocker of vertebrate cardiac muscle and neuronal l-type calciu ... | 2001 | 11698962 |
| determination of biogenic amines and endotoxin in squid, musky octopus, norway lobster, and mussel stored at room temperature. | little research has been published on the indicators of spoilage in mediterranean molluscan shellfish and crustaceans. thus is why we studied changes in the concentrations of endotoxin and four biogenic amines (histamine, putrescine, tyramine and cadaverine) in european common squid (loligo subulata, lamarck, 1798), musky octopus (eledone moschata, lamarck, 1798), norway lobster (nephrops norvegicus, linnaeus, 1758), and mussel (mytilus galloprovincialis, lamarck, 1819) from the adriatic sea sto ... | 2010 | 21183430 |
| the role of muscarinic receptors and intracellular ca2+ in the spectral reflectivity changes of squid iridophores. | in this paper we describe changes in spectral reflectivity of the light reflectors (iridophores) of the squid alloteuthis subulata. the spectral changes that can be seen in living squid, can also be brought about by superfusing whole skin preparations with acetylcholine (ach) (20 micro mol l(-1)) and muscarine (30 micro mol l(-1)) but not nicotine (up to 50 mmol l(-1)), suggesting that cholinergic muscarinic receptors are involved. changing the osmolarity of the external solution had no effect o ... | 2004 | 15107431 |
| ampa/kainate and nmda-like glutamate receptors at the chromatophore neuromuscular junction of the squid: role in synaptic transmission and skin patterning. | glutamate receptor types were examined at the chromatophore synapses of the squids alloteuthis subulata and loligo vulgaris, where nerve-induced muscle contraction causes chromatophore expansion. immunoblotting with antibody raised against a squid ampa receptor (sglur) demonstrated that ampa/kainate receptors are present in squid skin. application of l-glutamate evoked chromatophore muscle contractions in both ventral and dorsal skins, while nmda was only active on a subpopulation of dorsal chro ... | 2003 | 12581168 |
| effect of glycine on synaptic transmission at the third order giant synapse of the squids alloteuthis subulata and loligo vulgaris. | intracellular microelectrode recordings were made from presynaptic and postsynaptic regions of the third order giant synapses of the squids alloteuthis subulata and loligo vulgaris. synaptically generated postsynaptic action potential trains, and excitatory postsynaptic potentials (epsps) were reversibly decreased by glycine, beta - alanine or taurine while presynaptic action potentials (aps) were unaltered. glycine was effective in the presence of strychnine (30-50 microm), nmda (500 microm), a ... | 2002 | 12023063 |
| reflective properties of iridophores and fluorescent 'eyespots' in the loliginid squid alloteuthis subulata and loligo vulgaris. | observations were made of the reflective properties of the iridophore stripes of the squid alloteuthis subulata and loligo vulgaris, and the likely functions of these stripes are considered in terms of concealment and signalling. in both species, the mantle muscle is almost transparent. stripes of iridophores run along the length of each side of the mantle, some of which, when viewed at normal incidence in white light, reflect red, others green or blue. when viewed obliquely, the wavebands best ... | 2001 | 11441052 |
| phylogeny and historical biogeography of the loliginid squids (mollusca: cephalopoda) based on mitochondrial dna sequence data. | the cephalopod taxon loliginidae (cephalopoda: myopsida) is a species-rich group of tropical and temperate shallow-water squids, many of which are commercial fisheries objects and neurophysiological research organisms. the worldwide distribution of these squids could make loliginidae a useful case study in shallow-water marine biogeography, but the phylogeny of the group is unknown. to clarify loliginid phylogeny, regions of two mitochondrial genes (the 16s rrna and the cytochrome c oxidase subu ... | 2000 | 10837151 |
| ionic currents in cardiac myocytes of squid, alloteuthis subulata. | this paper provides the first study of voltage-sensitive membrane currents present in heart myocytes from cephalopods. whole cell patch clamp recordings have revealed six different ionic currents in myocytes freshly dissociated from squid cardiac tissues (branchial and systemic hearts). three types of outward potassium currents were identified: first, a transient outward voltage-activated a-current (ia), blocked by 4-aminopyridine, and inactivated by holding the cells at a potential of -40 mv; s ... | 2000 | 10707320 |
| synaptic interactions between crista hair cells in the statocyst of the squid alloteuthis subulata. | intracellular injections of the fluorescent dye lucifer yellow into the various cell types within the anterior transverse crista segment of the statocyst of squid revealed that the primary sensory hair cells and both large and small first-order afferent neurons have relatively simple morphologies, each cell having a single, unbranched axon that passes directly into the small crista nerve that innervates the anterior transverse crista. however, the small first-order neurons have short dendritic p ... | 1998 | 9705459 |
| l-glutamate and serotonin are endogenous in squid chromatophore nerves | colour changes in cephalopods are controlled by complex organs termed chromatophores whose radial muscles are directly innervated from the brain. in the squids alloteuthis subulata and loligo vulgaris, light microscopy of silver- or methylene-blue-stained preparations shows that each muscle is innervated by 2-6 nerves running along its length. an electron microscope (em) study shows that most of these nerves contain 50 nm diameter electron-lucent vesicles organised into numerous synapses along t ... | 1997 | 9359893 |
| different excitation-contraction coupling mechanisms exist in squid, cuttlefish and octopod mantle muscle | excitation-contraction (ec) coupling was studied in central zone mantle muscle fibres of a squid (alloteuthis subulata), a cuttlefish (sepia officinalis) and an octopod (eledone cirrhosa). thin slices of muscle were used for twitch experiments and enzymatic isolation of single fibres for whole-cell patch-clamp studies. the current required for a supramaximal twitch response during direct stimulation of muscle slices was lower for squid than for cuttlefish. in squid, but not in cuttlefish, the cu ... | 1997 | 9359892 |
| contractile properties of obliquely striated muscle from the mantle of squid (alloteuthis subulata) and cuttlefish (sepia officinalis) | the mechanical properties of obliquely striated muscle fibres were investigated using thin slices of mantle from squid alloteuthis subulata and cuttlefish sepia officinalis. brief tetani or twitch stimuli were used as this pattern is likely to occur during jetting of the intact animal. the length­active force relationship for twitches and tetani (0.1s, 50hz) was similar to that of vertebrate cross-striated fibres. passive force at the length giving maximum tetanic force was 0.13±0.05p ... | 1997 | 9320349 |
| electrical coupling between primary hair cells in the statocyst of the squid, alloteuthis subulata. | intracellular recordings were made from primary sensory hair cells located on the dorsal side of the anterior crista segment of the squid statocyst. these hair cells were electrophysiologically identified by the occurrence of an antidromic action potential after electrical stimulation of the crista nerve. two types of subthreshold, depolarising potentials were observed in the primary sensory hair cells. firstly, those due to efferent inputs onto the primary hair cells and secondly those correlat ... | 1993 | 8272270 |
| ultrastructure and permeability of the schwann cell layer surrounding the giant axon of the squid. | the ultrastructure of the schwann cell layer surrounding the giant axon of the squid alloteuthis subulata is described, and the permeability of extracellular compartments assessed by exposure to electron-dense tracers. morphometric analysis is used to deduce the number, size and shape of the schwann cells, and the routes for ion flux across the schwann cell layer. axons (mean diameter 233 microns) were surrounded by a 1-2 microns thick layer of schwann cells which were approximately 1 micron thi ... | 1993 | 8478646 |
| electrical coupling between secondary hair cells in the statocyst of the squid alloteuthis subulata. | the cephalopod angular acceleration receptor system has sensory response characteristics similar to those of the vertebrate semicircular canal system and, unusual for an invertebrate, contains secondary receptor hair cells. the experiments reported use intracellular recordings from pairs of hair cells to show that at least one subset of the hair cells is electrically coupled along the entire length of the crista section. the coupling can be reduced by application of heptanol or octanol. intracel ... | 1989 | 2541872 |
| the structure of some cephalopod statoliths. | the statoliths of sepia officinalits, octopus vulgaris, alloteuthis subulata and taonius megalops have a smooth outline, but an irregular shape. they have projections and indentations. the statoliths from a pair of statocysts are usually quite similar in size and shape, and the general pattern is probably maintained throughout the size range of the species. statoliths from large animals are marginally larger than those from smaller ones. the statolith usually occupies only a small part of the ca ... | 1976 | 1000602 |
| the fine structure of the ovarian follicle of alloteuthis subulata lam. (mollusca, cephalopoda). | | 1974 | 4371006 |
| the digestive mechanism of the european squids logio vulgaris, loligo forbesii, alloteuthis media, and alloteuthis subulata. | | 1950 | 24537669 |