| studies of the coagulation process in the crayfish, orconectes virilis: attempts to identify a fibrinogen-like factor. | | 1972 | 5075770 |
| single and multiple visual systems in arthropods. | extraction of two visual pigments from crayfish eyes prompted an electrophysiological examination of the role of visual pigments in the compound eyes of six arthropods. the intact animals were used; in crayfishes isolated eyestalks also. thresholds were measured in terms of the absolute or relative numbers of photons per flash at various wavelengths needed to evoke a constant amplitude of electroretinogram, usually 50 microv. two species of crayfish, as well as the green crab, possess blue- and ... | 1968 | 5641632 |
| permanent genetic resources added to molecular ecology resources database 1 october 2010-30 november 2010. | this article documents the addition of 277 microsatellite marker loci to the molecular ecology resources database. loci were developed for the following species: ascochyta rabiei, cambarellus chapalanus, chionodraco hamatus, coptis omeiensis, cynoscion nebulosus, daphnia magna, gerbillus nigeriae, isurus oxyrinchus, lates calcarifer, metacarcinus magister, oplegnathus fasciatus, pachycondyla verenae, phaethon lepturus, pimelodus grosskopfii, rotylenchulus reniformis, scomberomorus niphonius, sep ... | 2011 | 21429157 |
| permanent genetic resources added to molecular ecology resources database 1 december 2010-31 january 2011. | this article documents the addition of 238 microsatellite marker loci to the molecular ecology resources database. loci were developed for the following species: alytes dickhilleni, arapaima gigas, austropotamobius italicus, blumeria graminis f. sp. tritici, cobitis lutheri, dendroctonus ponderosae, glossina morsitans morsitans, haplophilus subterraneus, kirengeshoma palmata, lysimachia japonica, macrolophus pygmaeus, microtus cabrerae, mytilus galloprovincialis, pallisentis (neosentis) celatus, ... | 2011 | 21457476 |
| the deposition of skeletal structures in the crustacea. 5. the histomorphological and histochemical changes associated with the development and calcification of the branchial exoskeleton in the crayfish, orconectes virilis hagen. | | 2016 | 4955157 |
| chytrid fungus batrachochytrium dendrobatidis has nonamphibian hosts and releases chemicals that cause pathology in the absence of infection. | batrachochytrium dendrobatidis, a pathogenic chytrid fungus implicated in worldwide amphibian declines, is considered an amphibian specialist. identification of nonamphibian hosts could help explain the virulence, heterogeneous distribution, variable rates of spread, and persistence of b. dendrobatidis in freshwater ecosystems even after amphibian extirpations. here, we test whether mosquitofish (gambusia holbrooki) and crayfish (procambarus spp. and orconectes virilis), which are syntopic with ... | 2013 | 23248288 |
| high-resolution structural and elemental analyses of calcium storage structures synthesized by the noble crayfish astacus astacus. | during premolt, crayfish develop deposits of calcium ions, called gastroliths, in their stomach wall. the stored calcium is used for the calcification of parts of the skeleton regularly renewed for allowing growth. structural and molecular analyses of gastroliths have been primarily performed on three crayfish species, orconectes virilis, procambarus clarkii, and more recently, cherax quadricarinatus. we have performed high-resolution analyses of gastroliths from the native noble crayfish, astac ... | 2016 | 27612582 |
| crayfish feeding responses to zebra mussels depend on microorganisms and learning. | three species of crayfish (orconectes virilis, o. rusticus, andcambarus robustus) were tested for feeding responses to potential food odors from mollusks (either zebra mussels,dreissena polymorpha, or native gastropods). in all three crayfish species, feeding responses to odor cues were shown only by individuals experienced with feeding on a prey type. individuals exposed to just the smell of prey organisms did not show feeding responses, indicating the role of associative learning in diet bread ... | 1994 | 24241836 |
| sensitivity of excitable and inexcitable membranes to alpha-dihydrograyanotoxin ii. | a variety of excitable and inexcitable preparations have been examined for their sensitivity to the depolarizing action of alpha-dihydrograyanotoxin ii. alpha-dihydrograyanotoxin ii was effective in producing membrane depolarization in giant axons from the crayfish (procambarus clarki) and sartorius muscle fibers from the frog (rana pipiens) and the salamander (taricha torosa). the toxin-induced depolarization was reversed by lowering the external sodium concentration. high concentrations of tet ... | 1978 | 727243 |
| survey of the crayfish plague pathogen presence in the netherlands reveals a new aphanomyces astaci carrier. | north american crayfish species as hosts for the crayfish plague pathogen aphanomyces astaci contribute to the decline of native european crayfish populations. at least six american crayfish species have been reported in the netherlands but the presence of this pathogenic oomycete with substantial conservational impact has not yet been confirmed in the country. we evaluated a. astaci prevalence in dutch populations of six alien crustaceans using species-specific quantitative pcr. these included ... | 2014 | 24933021 |
| young northern pike, yellow perch and crayfish as bioindicators in a mercury contaminated watercourse. | young-of-the-year and yearling northern pike (esox lucius), yearling yellow perch (perca flavescens) and adult crayfish (orconectes virilis) were collected in the mercury-contaminated wabigoon/english/winnipeg river system, ontario, and analyzed for total mercury. analysis of mercury concentrations in these organisms produced consistent geographical trends; i.e. mercury concentrations in biota downstream of dryden > english river system > winnipeg river system > control sites. in the wabigoon ri ... | 1991 | 24241775 |