| interactions among juveniles of two freshwater crayfish species and a predatory fish. | two freshwater crayfish species, astacus astacus l. and pacifastacus leniusculus dana, co-occur in some swedish lakes. observational studies indicate that the introduced, north american species p. leniusculus may gradually replace the native a. astacus, but the mechanism behind the replacement is not known. this study examined the direct effects of interspecific competition between the crayfish, and indirect effects of competitive interactions and fish (european perch, perca fluviatilis l.) pred ... | 1994 | 28307005 |
| monitoring of noble, signal and narrow-clawed crayfish using environmental dna from freshwater samples. | for several hundred years freshwater crayfish (crustacea-decapoda-astacidea) have played an important ecological, cultural and culinary role in scandinavia. however, many native populations of noble crayfish astacus astacus have faced major declines during the last century, largely resulting from human assisted expansion of non-indigenous signal crayfish pacifastacus leniusculus that carry and transmit the crayfish plague pathogen. in denmark, also the non-indigenous narrow-clawed crayfish astac ... | 2017 | 28654642 |
| crustacean cardioactive peptide-immunoreactive neurons in the ventral nervous system of crayfish. | crustacean cardioactive peptide-immunoreactive neurons have been mapped in whole-mount preparations and sections of the ventral nervous system of the crayfish astacus astacus and orconectes limosus. based on their morphology, projection patterns, and staining characteristics, two types of contralaterally projecting neurons are individually identifiable. in both species, these neurons occur in all neuromers as apparent serial homologs. in adult specimens, one type of cell has a small, densely sta ... | 1994 | 7814685 |
| quantitative determination and distribution of the myotropic neuropeptide orcokinin in the nervous system of astacidean crustaceans. | for quantitative determinations of orcokinin, an indirect, noncompetitive sandwich elisa was developed. this elisa is highly specific for orcokinin and the detection limit is 1 fmol. in three astacidean species (orconectes limosus, homarus americanus, and astacus astacus) orcokinin immunoreactivity (ok-ir) was measurable in all parts of the nervous system. upon normalization to the protein content of the tissue (pmol/mg protein), concentrations were shown to be in the same range in all three spe ... | 1994 | 7937311 |
| [the behavioral reactions of fresh-water crayfish to sensory exposures: the autonomic components]. | sudden changes of the environment such as a short-lasting shadowing of an animal, placing of some small objects into the tank, light vibrations of the bottom etc. caused vegetative responses in the freely moving native crayfish astacus astacus and the american crayfish procambarus cubensis adapted for many generations to aquarium habitat. we observed mainly a sudden decrease of ecg-frequency correlated with similar changes in the electrical activity of the muscles moving the specific ventilatory ... | 2006 | 8135058 |
| a light emitting diode microspectrophotometer: intracellular ca2+ measurements in isolated stretch receptor. | a microspectrophotometer was designed to measure absorbance changes in single cells. the device utilizes sequentially activated light emitting diodes (led) to provide different wave lengths of light. the instrument has the advantage of relative simplicity and less cost compared to other devices. the spectrophotometer was tested by measuring absorbance changes of the metallochromic ca2+ indicator arsenazo iii (aiii) injected into the crayfish (astacus astacus) stretch receptor. under the conditio ... | 1993 | 8377522 |
| [ultrastructural organization of the gastric ganglion in the crayfish]. | anatomy of the gastric ganglion in the stomatogastric region of the vegetative nerve system has been studied in astacus astacus at light optic and ultrastructural levels. topography, neuroglial and interneuronal relationships of its elements have been described. various types of synapses of the ganglionic neuropil have been described. the role of the ganglionic structural elements in receiving and treating sensory information and in regulation of gastric movements is discussed. | 1980 | 7458692 |
| [auragrams of single axons of the stretch receptor of the crayfish astacus astacus]. | | 1972 | 4642923 |
| distribution of protein tracers in the nervous system of the crayfish (astacus astacus l.) following systemic and local application. | | 1972 | 4668768 |
| [cilia of hair receptors in the claw of the crayfish astacus astacus]. | | 2008 | 4647991 |
| [ultrastructure of invertebrate hemocytes. v. hemocytes of astacus astacus (l.) (crustacea)]. | | 1971 | 4330718 |
| on the eggs of an enigmatic nematode parasite encapsulated in the connective tissue of the european crayfish, astacus astacus in sweden. | | 2000 | 5720509 |
| [action of various inhibitors on the activity of the stretch receptors of the crayfish (astacus astacus)]. | | 1967 | 6053256 |
| metabolism in the crayfish astacus astacus (l). iv. --the fatty acid composition and the biosynthesis of the fatty acids. | | 1966 | 4165824 |
| metabolism in the crayfish astacus astacus (l.). 3. absence of cholesterol synthesis. | | 1966 | 4162224 |
| metabolism in the crayfish astacus astacus (l.). ii. the energy-yielding metabolism. | | 1966 | 4159942 |
| metabolism in the crayfish astacus astacus (l.). i. biosynthesis of amino acids. | | 1966 | 4159941 |
| localization of monoaminergic neurons in the central nervous system of astacus astacus linné (crustacea). | | 1966 | 5299272 |
| lipid metabolism in astacus astacus (l.). | | 1962 | 14009779 |
| primary structures of decapod crustacean metallothioneins with special emphasis on freshwater and semi-terrestrial species. | cadmium injections induced only a single form of metallothionein (mt) in the midgut gland of potamon potamios, whereas the same treatment induced two isoforms in astacus astacus. the only difference between the two latter isoforms was that one had an extra n-terminal methionine residue. mt from p. potamios showed structural differences from other decapod crustacean mts. it contained a gly-thr motif at positions 8 and 8a, which had previously been found only in certain vertebrate and molluscan mt ... | 1996 | 8921011 |
| change in intracellular concentration of free amino acids as a factor of euryhalinity in the crayfish astacus astacus. | | 1961 | 13888133 |
| [experiments on the chromatographic separation of myotropic substances from the eyestalk of astacus astacus]. | | 1957 | 13447911 |
| characterization and molecular reaction scheme of a chloride channel expressed after axotomy in crayfish. | the nerve to the deep extensor abdominal muscle (deam) in crayfish species astacus astacus, containing four excitatory and one inhibitory motor axons, was cut in the third segment on one side of the animal. the distal axon stump was not subject to phagocytosis but was present for months after the axotomy. the two lateral bundles of the deam were prepared 4-6 weeks after the axotomy. the gamma-aminobutyric-acid-(gaba-) activated chloride channel of these bundles was characterized by applying puls ... | 1996 | 8772138 |
| the effect of repeated stimulation on the escape reflex and the acetylcholinesterase activity in different parts of the central nervous system in the crayfish (pacifastacus leniusculus and astacus astacus). | | 1974 | 4156203 |
| [characteristics of impulse trains in cells of the 6th abdominal ganglion of the crayfish astacus astacus]. | | 2006 | 4766461 |
| aphanomyces astaci isolate from latently infected stone crayfish (austropotamobius torrentium) population is virulent. | aphanomyces astaci infection is the cause of crayfish plague in european crayfish. here the virulence of an a. astaci as strain isolated from apparently healthy stone crayfish (austropotamobius torrentium) from slovenia was compared to that of the psl-puujärvi a. astaci isolate in 3 crayfish species: noble crayfish (astacus astacus), signal crayfish (pacifastacus leniusculus) from finland and stone crayfish from slovenia. all 3 crayfish species were challenged with psi-puujärvi a. astaci and suc ... | 2017 | 28716442 |
| voltage dependence of depolarization-contraction coupling processes in skeletal muscle cells. | changes of contraction and optical anisotropy of isolated skeletal muscle cells from rana temporaria and astacus fluviatilis were compared under voltage clamp conditions. the time course of the optical signal from frog muscle was shown to consist of two components which could be attributed to calcium binding both on the sarcoplasmic reticulum ca-atpase and troponin c. the optical signal from the crayfish muscle has no distinguishable components, and its onset probably reflects the start of ca-at ... | 1990 | 2358185 |