| effects of calcium ions and adenosine diphosphate on the activities of nad+-linked isocitrate dehydrogenase from the radular muscles of the whelk and flight muscles of insects. | 1. the activity of nad+-linked isocitrate dehydrogenase from the radular muscle of the whelk is higher than those in many vertebrate muscles and only slightly lower than in the flight muscles of insects. the enzyme activity from the whelk (buccinum undatum) is stable for several hours after homogenization of the radular muscle, whereas that from insect flight muscle is very unstable. consequently, the enzyme from the whelk muscle is suitable for a systematic investigation of the effects of ca2+ ... | 1976 | 182126 |
| immunocytochemical distribution of neuropeptide f (npf) in the gastropod mollusc, helix aspersa, and in several other invertebrates. | the distribution of neuropeptide f (npf) immunoreactivity in the snail, helix aspersa, has been demonstrated by immunocytochemistry using 2 region-specific antisera. one, designated npf3, was raised against a synthetic n-terminal fragment of helix aspersa npf; the other, designated pp221, was raised against the c-terminal hexapeptide amide of mammalian pancreatic polypeptide (pp) but cross-reacts fully with the analogous c-terminal region of helix aspersa npf. the distribution of npf immunoreact ... | 1994 | 8111844 |
| [significance of electron interactions of fatty acids of phospholipid molecules in the organism adaptation to habitation temperature]. | data in the fatty acid composition of muscle tissue phospholipids of some representatives of gastropod molluscs (gastropoda) have been presented for the first time. in the lake phytophagues lymnaea stagnalis and lymnaea ovata the long-chained c22-acid was not detected, whereas in the predator common whelk buccinum undatum, c22:6omega3 was present. comparison of absorption spectra (240-720 nm) of lipid extracts of the studied invertebrates and of rat has been performed. the obtained data are disc ... | 2009 | 19764632 |
| [the osphradium of the prosobranch gastropods buccinum undatum l. and neptunea antiqua]. | | 2016 | 4893068 |
| impact of a castrating trematode, neophasis sp., on the common whelk, buccinum undatum, in the northern gulf of st. lawrence. | we observed heavy trematode infections of whelks, buccinum undatum, from the mingan islands, eastern canada, by larval stages of a species of neophasis. only sexually mature whelks were infected, 23% of mature females and 15% of mature males, and prevalence increased rapidly with whelk size. in most cases the parasite completely occupied the gonad, causing castration. the digestive gland was also infected, although to a lesser degree (0% to 50% occupation), and a marked reduction in the mass of ... | 2000 | 10786946 |
| [characteristics of proteinase digestive function in invertebrates--inhabitants of cold seas]. | digestive proteinases of various taxa of invertebrates of the northern seas have been studied: crustaceans paralithodes camtchaticus, pandalus borealis; molluscs chlamys islandicus, buccinum undatum, serripes groenlandicus, and echinoderms strongylocentrotus droebachiensis, cucumaria frondosa, asterias rubens, and grossaster papposus. the presence of two proteolytic activity peaks in the acid (ph 2.5-3.5) and low alkaline zones (ph 7.5-8.5) and a similar proteinase spectrum have been revealed in ... | 2012 | 18038635 |
| levels of polybrominated diphenyl ether (pbde) flame retardants in animals representing different trophic levels of the north sea food web. | the levels of individual pbde congeners were investigated in the invertebrate species whelk (buccinum undatum), seastar (asterias rubens), and hermit crab (pagurus bernhardus), the gadoid fish species whiting (merlangius merlangus) and cod (gadus morhua), and the marine mammal species harbor seal (phoca vitulina) and harbor porpoise (phocoena phocoena). these species are all important representatives of different trophic levels of the north sea food web. all six major pbde congeners detected (bd ... | 2002 | 12380070 |
| subtidal food thieves: interactions of four invertebrate kleptoparasites with the sea star leptasterias polaris. | we used time-lapse underwater video systems in the subtidal zone of the mingan islands, eastern canada, to examine behavioural interactions of four kleptoparasites with the sea star leptasterias polaris when it was feeding on infaunal (buried) clams. departures of l. polaris from its prey coincided with interactions with kleptoparasites in 10 out of 10 filmed feeding bouts on the large clam spisula polynyma, compared with only four out of 10 of filmed bouts on the smaller clam mya truncata. the ... | 2000 | 11032656 |
| commercially important species associated with horse mussel (modiolus modiolus) biogenic reefs: a priority habitat for nature conservation and fisheries benefits. | horse mussel reefs (modiolus modiolus) are biodiversity hotspots afforded protection by marine protected areas (mpas) in the ne atlantic. in this study, horse mussel reefs, cobble habitats and sandy habitats were assessed using underwater visual census and drop-down video techniques in three uk regions. megafauna were enumerated, differences in community composition and individual species abundances were analysed. samples of conspicuous megafauna were also collected from horse mussel reefs in or ... | 2017 | 28222862 |
| the subtle intracapsular survival of the fittest: maternal investment, sibling conflict, or environmental effects? | developmental resource partitioning and the consequent offspring size variations are of fundamental importance for marine invertebrates, in both an ecological and evolutionary context. typically, differences are attributed to maternal investment and the environmental factors determining this; additional variables, such as environmental factors affecting development, are rarely discussed. during intracapsular development, for example, sibling conflict has the potential to affect resource partitio ... | 2013 | 24358712 |
| the secret to successful deep-sea invasion: does low temperature hold the key? | there is a general consensus that today's deep-sea biodiversity has largely resulted from recurrent invasions and speciations occurring through homogenous waters during periods of the phanerozoic eon. migrations likely continue today, primarily via isothermal water columns, such as those typical of polar regions, but the necessary ecological and physiological adaptations behind them are poorly understood. in an evolutionary context, understanding the adaptations, which allow for colonisation to ... | 2012 | 23227254 |
| immunohistochemical localization of hepatopancreatic phospholipase in gastropods mollusc, littorina littorea and buccinum undatum digestive cells. | among the digestive enzymes, phospholipase a2 (pla2) hydrolyzes the essential dietary phospholipids in marine fish and shellfish. however, we know little about the organs that produce pla2, and the ontogeny of the pla2-cells. accordingly, accurate localization of pla2 in marine snails might afford a better understanding permitting the control of the quality and composition of diets and the mode of digestion of lipid food. | 2011 | 22114916 |
| arsenic concentration and speciation of the marine hyperaccumulator whelk buccinum undatum collected in coastal waters of northern britain. | european whelks (buccinum undatum) have shown to accumulate high levels of arsenic. since the accumulation process is not well understood it is necessary to gain information about the geographical variability of the arsenic concentration in them. here we show that the mean arsenic concentrations of the whelks are site specific and vary by a factor of 3.5 in ten different geographical locations. at fishing grounds where whelks exhibited low arsenic concentrations the arsenic concentration increas ... | 2010 | 21491679 |
| bioaccumulation and biotransformation of pyrene and 1-hydroxypyrene by the marine whelk buccinum undatum. | the fates of a phenolic contaminant and its hydrocarbon precursor have rarely been compared, especially in an invertebrate species. two groups of buccinum undatum were exposed to equimolar amounts of pyrene and 1-hydroxypyrene over 15 d through their diets. tissue extracts from the muscle and visceral mass were analyzed by liquid chromatography with fluorescence and mass spectrometry detection. nine biotransformation products were detected in animals from both exposures. these included 1-hydroxy ... | 2010 | 20821506 |
| [about effect of habitat and motor activity of molluscs on fatty acid composition of triglycerides and phospholipids]. | a comparative analysis of fatty acids (fa) in neutral and phospholipids of digestive gland and pedal muscle has been performed in molluscs from various ecological groups differing by belonging to sea or fresh water, trophic types or the associated motor activity. in freshwater pulmonary gastropods lymnaea stagnalis and limnaea ovalis and marine prosobranchial molluscs buccinum undatum and littorina littorea the total content of omega3-acids in phospholipids of the studied tissues differed more t ... | 2009 | 19370988 |
| [lipids composition and speed of energy metabolism in gastropods]. | lipid composition of digestive gland and pedal muscle of two northern freshwater pulmonate snails lymnaea stagnalis and lymnaea ovata and three marine prosobranch gastropods littorina obtusata, littorina littorea, buccinum undatum from the white sea was studied. the species differ in ecology, particularly in trophic nabits and motor activity. the content of triacilglycerides both in digestive gland and pedal was higher in littoral dwellers littorina the activity of which depends on the tide leve ... | 2009 | 19140337 |
| bioaccessibility of essential and non-essential metals in commercial shellfish from western europe and asia. | maximum acceptable concentrations of metals in food - based on total concentrations - have been established in many countries. to improve risk assessment, it would be better to take into account bioaccessible concentrations. a total of seven species of molluscs from france, uk and hong kong was examined in this study including clams, mussels, oysters, scallops and gastropods. the species which have total metal concentrations higher than the most severe food security limits are mainly oysters (al ... | 2008 | 18329777 |
| the action of rfamide neuropeptides on molluscs, with special reference to the gastropods buccinum undatum and busycon canaliculatum. | the ever-growing rfamide neuropeptide superfamily has members in all animal phyla. their effects in molluscs, on both smooth and cardiac muscle as well as on neurons, has been studied in detail. these neuropeptides exert a variety of functions: excitatory, inhibitory or even biphasic. firstly, the literature on the excitatory effect of the rfamide neuropeptides on molluscan muscle and neurons has been reviewed, with greater emphasis and examples from the gastropods buccinum undatum and busycon c ... | 2006 | 16516343 |
| rfamide neuropeptide actions on the molluscan ventricle: interactions with primary neurotransmitters. | different rfamide neuropeptides, some of non-molluscan origin, were examined for their effect on the ventricles of buccinum undatum and busycon canaliculatum. none of the peptides tested were inhibitory on these ventricles. all the peptides were extremely active, causing excitation of the preparations at low concentrations. the neuropeptides were then tested with the primary neurotransmitters. in the case of serotonin, the excitatory primary neurotransmitter, the rfamide neuropeptides induced a ... | 2013 | 16337217 |
| butyltin species in benthic and pelagic organisms of the saguenay fjord (canada) and imposex occurrence in common whelk (buccinum undatum). | the distribution and accumulation of butyltins in various tissues of 13 benthic and pelagic species living in the sub-arctic saguenay fjord (canada) were investigated. butyltin contamination was ubiquitous in this ecosystem with tributyltin (tbt) biota to sediment accumulation factors (bsaf) ranging between 0.22 and 11, but without any important biomagnification between trophic levels. the large range of butyltin compounds accumulating within different tissues of the species collected from all t ... | 2006 | 16237495 |
| common whelk (buccinum undatum) allergy: identification of ige-binding components and effects of heating and digestive enzymes. | in korea, common whelk (buccinum undatum) is a popular edible shellfish. the aim of this study was to observe the sensitization rate to common whelk and to characterize its allergens. we carried out skin prick test (spt) in 1,700 patients with various allergic diseases. specific ige were detected by elisa in the patient sera and elisa inhibition tests were conducted. ige-binding components were identified by means of sds-page and ige-immunoblotting. the effects of digestive enzymes were evaluate ... | 2004 | 15608387 |
| rfamide neuropeptide actions on molluscan proboscis smooth muscle: interactions with primary neurotransmitters. | the potency (muscle force-generated) of a number of long-chain rfamide neuropeptides was examined in mechanical experiments with the radular-retractor and radular-sac muscles of gastropods buccinum undatum and neptunea antiqua. many of the heptapeptides, octapeptides and the decapeptide lms were found to induce greater contraction than fmrfamide in both smooth muscles and in both species. rfamide neuropeptides interacted with the neurotransmitter acetylcholine in an additive way and rfamide-indu ... | 2004 | 15042399 |
| comparative potency of some extended peptide chain members of the rfamide neuropeptide family, assessed on the hearts of busycon canaliculatum and buccinum undatum. | twenty different rfamide neuropeptide analogues were examined for their relative potencies on the ventricles of busycon canaliculatum and buccinum undatum and on the atrium of busycon to determine the essential requirements for activity at the rfamide receptor. none of the neuropeptide studies was inhibitory to natural cardiac rhythmicity or to fmrfamide (phe-met-arg-phe-nh(2)) or flrfamide (phe-leu-arg-phe-nh(2)) responses. two tripeptides studied were completely without effect, indicating that ... | 2003 | 12937940 |
| structural organization of the nervous system of the mantle cavity wall and organs in prosobranch mollusks. | a variety of common histological stains was used, along with the golgi and colognier silver impregnation methods and electron microscopy, to perform a comparative study of the morphological characteristics of receptor and nerve cells and their interactions in the nervous system of the wall of the mantle cavity and mantle derivatives - gills, siphon, and osphradia - of the marine prosobranch gastropod mollusks buccinum undatum and littorina littorea. the results are discussed along with our own p ... | 2003 | 12762596 |
| imposex and organotin concentrations in buccinum undatum and neptunea antiqua from the north sea: relationship to shipping density and hydrographical conditions. | the presence and the development of imposex were investigated in the common whelk (buccinum undatum) and the red whelk (neptunea antiqua) from the open north sea and the skagerrak. imposex development was related to levels of organotins in snails and in the fine fractions (< 63 microm) of the sediments they inhabit. the sampling locations were classified according to three levels of traffic densities of ships of > or = 100 gt per day passing within 15 nautical miles of the sampling station, ship ... | 2003 | 12688240 |
| butyltin compounds in sediment and molluscs from the shipping strait between denmark and sweden. | the distribution of tributyltin (tbt) contamination in the subtidal zone of the waters between denmark and sweden was investigated in relation to major international shipping lanes. sediment and different benthic molluscs were sampled in transects along and perpendicularly to the shipping lanes in the sound (øresund) and the kattegat/skagerrak region. the samples were analysed for tbt and its degradation products, dibutyltin (dbt) and monobutyltin (mbt), using gc-pfpd. in sediments, the tbt conc ... | 2003 | 12683978 |
| cytochrome p450 differences in normal and imposex-affected female whelk buccinum undatum from the open north sea. | normal and imposex-affected female buccinum undatum were sampled from the open north sea at three locations, one with low, and two with high shipping densities. cytochrome p450 components and p450 aromatase activity were determined in the microsomal fractions isolated from pooled digestive gland/gonads. cytochrome p450 aromatase activity was significantly higher (p < 0.05) in normal females collected in the low shipping density area (1,325 +/- 295 fmol/h/mg protein) than levels from imposex anim ... | 2010 | 12408632 |
| [formation of basal bodies in the ciliary epithelium of molluscs buccinum undatum l. and lymnaea stagnalis l]. | electron microscopic studies of the leg ciliary epithelium was carried out in two mollusks. in the epithelium of the leg of adult animals, the centrioles were mostly formed de novo with participation of deuterosomes during the formation of basal bodies. transformation of the centriolar cylinder in a mature basal body is accompanied by the cylinder elongation and appearance of pericentriolar structures, such as rootlet system, basal legs, and basal plate. centriolegenesis proceeds in both ciliate ... | 2006 | 12068719 |
| imposex induction in laboratory reared juvenile buccinum undatum by tributyltin (tbt). | here we report a series of experiments on the development and occurrence of imposex in the common whelk, buccinum undatum, under the influence of (chronic) exposure to butyltin compounds. the main objective of the experiments was to obtain more information about the effects of organotin compounds in the marine environment, which possibly relate to the reported decline of b. undatum in dutch coastal waters. in these studies tributyltin (tbt) dose-dependently induced the development of male sexual ... | 2002 | 21782586 |
| occurrence and effects of organotins on adult common whelk (buccinum undatum) (mollusca, gastropoda) in harbours and in a simulated dredging situation. | transplanted common whelk (buccinum undatum) (mollusca, gastropoda) accumulated fairly high levels of organotins (tributyltin (tbt) and triphenyltin (tpt)) during exposure in three harbours with different tbt contamination. this did not though lead to an increase in imposex frequency in the adult females studied. simulating harbour dredging in an experiment using suspended sediment from one of the harbours only resulted in a low concentration of tbt in the tissues of the common whelk and subsequ ... | 2001 | 11436817 |
| aggregation of whelks, buccinum undatum, near feeding predators: the role of reproductive requirements. | in the mingan islands, northern gulf of st lawrence (eastern canada), the whelk buccinum undatum displays a strong escape response to its predator, the asteroid leptasterias polaris, nevertheless large sexually mature individuals occasionally approach feeding l. polaris to obtain food. in this study, we investigated the hypothesis that reproductive requirements increase the tendency of sexually mature whelks to approach feeding asteroids. prior to egg laying, females (which invest more energy th ... | 2001 | 11170694 |
| excitation evoked by fmrfamide and flrfamide in the heart of buccinum undatum and evidence for inositol 1,4,5-trisphosphate as an rf-tetrapeptide second messenger. | in this study the relative potencies of four established molluscan cardioexcitatory agents were examined on buccinum heart. the potencies were, in decending order: phenylalanine-leucine-arginine-phenylalanine-nh2 (flrfamide) > phenylalanine-methionine-arginine-phenylalanine-nh2 (fmrfamide; 80% of maximum) > 5-hydroxytryptamine (5ht; 60% of maximum) > guanosine triphosphate (gtp; 15% of maximum). fmrfamide and flrfamide had similar dose-response curve patterns with thresholds at 10(-9) mol l(-1) ... | 2000 | 11083516 |
| the use of imposex to assess tributyltin contamination in coastal waters and open seas. | imposex in muricid gastropods has been used to monitor tributyltin (tbt) contamination worldwide. pollution was severe during the 1980s but regulations prohibiting the use of tbt-based antifoulants on vessels < 25 m in length have been highly effective in reducing tbt levels in coastal waters. large vessels are still sources of tbt and major ports, especially those with dry docking and repair facilities, continue to be hot-spots of contamination. measures of imposex suggest that severe pollution ... | 2000 | 11007278 |
| interpopulation and context-related differences in responses of a marine gastropod to predation risk. | we conducted laboratory experiments to investigate interpopulation differences in the behavioural responses of the whelk buccinum undatum to the predatory lobster homarus americanus and the asteroid leptasterias polaris, both in the absence and presence of feeding opportunities. whelks from three populations in the eastern north atlantic (1) responded to lobsters by displaying avoidance behaviours (burrowing in the sediments or retreating inside their shell), (2) responded to asteroids by displa ... | 1999 | 10202105 |
| a field test of threat sensitivity in a marine gastropod | in the mingan islands, the whelk buccinum undatum displays defensive manoeuvres to both contact and water-borne chemical cues from the predatory asteroid leptasterias polarisin spite of this, whelks occasionally aggregate in great numbers near l. polaris while it is ingesting a prey; they then attempt to steal food from their predator and also wait for leftovers. in this study, the response of whelks in different types of encounters with l. polaris was examined to test the hypothesis that whelks ... | 1997 | 9398362 |
| amino-acid sequence of a cooperative, dimeric myoglobin from the gastropod mollusc, buccinum undatum l. | the complete amino-acid sequence of a dimeric myoglobin from the radular mussel of the gastropod mollusc, buccinum undatum l. has been determined. the globin, which shows cooperative binding of oxygen, contains 146 amino acids, is n-terminal aminoacetylated, and has histidine residues at position 65 and 97, corresponding to the heme-binding histidines seen in mammalian myoglobins. it shows about 75% and 50% homology, respectively, with the dimeric molluscan myoglobins from busycon canaliculatum ... | 1994 | 7947957 |
| quantitation and chromatographic characterisation of neuropeptide f(npf) immunoreactivity in molluscan nervous tissue using region-specific antisera. | neuropeptide f (npf) immunoreactivity has been quantified in extracts of the central nervous system from four gastropod (helix aspersa, buccinum undatum, littorina littorea, and patella vulgaris) and two bivalve (mytilus edulis and pecten maximum) molluscs using two region-specific radioimmunoassays. the first employed an antiserum, npf3, raised to a synthetic n-terminal fragment of h. aspersa npf and the second employed an antiserum, pp221, raised to the synthetic c-terminal hexapeptide amide o ... | 1994 | 8174933 |
| dependence upon external calcium for contractile activity in two molluscan proboscis muscles. | 1. both the radular sac and odontophore retractor muscles of buccinum undatum depend upon [ca]0 to raise the [ca]i concentration of the contractile system to activation level. 2. the k-induced responses of the muscles depend mainly upon [ca]0 for activator ca while the ach responses depend upon [ca]0 to raise stored intracellular ca to activation levels. 3. in the radular sac muscle, it is probable that the inward current is carried by na+ or is na(+)-dependent and this current may release [ca]i ... | 1991 | 1676951 |
| molluscan visceral muscle fine structure. general structure and sarcolemmal organization in the smooth muscle of the intestinal wall of buccinum undatum l. | fine structure of intestinal muscle in the gastropod buccinum undatum is described. myofibrillar organization is typical of non-pseudostriated molluscan muscles. the dense body system is poorly developed but there are extensive attachments plaques. the sarcolemma is elaborately modified. deep infoldings of the membrane give the cells an irregular outline. such infoldings enclose extracellular matrix and are associated with attachment plaques. arising from these and from the general sarcolemma ar ... | 1981 | 7198305 |
| high resolution scanning electron microscopy in biology: artefacts caused by the nature and mode of application of the coating material. | results of high resolution secondary electron observations of the haemocyanin molecule from the marine whelk buccinum undatum are given. the choice of metal used for surface coating of the sample (gold, gold--palladium or carbon/gold--palldium) and the mode of application of this metal (thermal vacuum evaporation or diode sputtering) were both found to be of utmost importance when working at high magnifications in the scanning electron microscope. sputter coating with gold gives poor results bec ... | 1978 | 357727 |
| local surface differentiations at the vegetal pole of the eggs of nassarius reticulatus, buccinum undatum, and crepidula fornicata (gastropoda, prosobranchia). | | 1977 | 562806 |
| the metabolism of biphenyl. v. phenolic metabolites in some marine organisms. | the phenolic metabolites of biphenyl in the crustacean cirolana borealis liljeborg (isopoda), the gastropod buccinum undatum l and the ophiuroid ophiocomina nigra abildgaard have been analysed qualitatively and semi-quantitatively as trimethylsilyl (tms) ethers by combined gas chromatography/mass spectrometry and gas chromatography, respectively. the findings demonstrate the in vivo metabolic capacity of these organisms to convert biphenyl into its hydroxylated derivatives. thus, 2-hydroxybiphen ... | 1977 | 576551 |
| oxygen binding by the haemocyanin from buccinum undatum. | | 1977 | 14262 |
| localization of reducing group activity in the structural protein ribbons of the egg capsule of the gastropod mollusc buccinum undatum l. | egg capsules of the gastropod molluse buccinum undatum l. show a staining reaction with silver-methenamine reagent with prior treatment with periodate. the reactivity is specifically localized on the striated structural protein ribbons which form the capsule walls. the staining is in the region of ribbon most resistant to chemical degradation and where the constituent protein monomers are believed to overlap and be cross-linked. since the proteins contain little cysteine it is likely that the st ... | 1977 | 70865 |
| steroid biosynthesis in the whelk, buccinum undatum. | | 1976 | 963979 |
| an unusual type of secretory cell in the ventral pedal gland of the gastropod mollusc buccinum undatum l. | the ventral pedal gland in the foot of the mature female whelk buccinum undatum l. consists of a shallow pouch containing a layer of elongated cells which partially penetrate a basement membrane overlying layers of smooth muscle. this glandular epithelium contains acid mucopolysaccharide cells, ciliated and interstitial cells as well as the upper part of a new type of subepidermal gland cell. these gland cells consist of an elongated extracellular tubular duct formed by an invagination of the ce ... | 1976 | 941131 |
| immunochemical properties of the haemocyanins from buccinum undatum (l.) and neptunea antiqua (l.). | | 1975 | 240605 |
| general characterization and circular dichroism of buccinum undatum haemocyanin. | | 1975 | 234059 |
| fluorescent chromophore components from the egg capsules of the gastropod mollusc buccinum undatum (l.), and their relation to fluorescent compounds in other structural proteins. | | 1974 | 4452233 |
| gastropod haemocyanins: dissociation of haemocyanins from buccinum undatum, neptunea antiqua and colus gracilis in the region ph 7.5-9.2. | | 1973 | 4761985 |
| the fine structure of the smooth muscle in the hypobranchial gland of the gastropod buccinum undatum l. | | 1972 | 4570948 |
| ultrastructural search for homologues of pancreatic -cells in the intestinal mucosa of the mollusc buccinum undatum. | | 1971 | 4934409 |
| fibrous protein ultrastructure of gastropod periostracum (buccinum undatum l.). | | 1970 | 5485274 |
| invertebrate structure proteins. characterization of the operculum of the gastropod mollu buccinum undatum. | | 1970 | 5450134 |
| partial characterization of a biologically active steroid glycosideisolated from the starfish marthasterias glacialis. | 1. a steroid glycoside (m(2)), which induces avoidance and other reactions in the mollusc buccinum undatum, has been isolated from extracts of the starfish marthasterias glacialis by ion-exchange chromatography. 2. the steroid glycoside was homogeneous by t.l.c. and contained glucose, quinovose, fucose and sulphate in the molar proportions 1:2:1:1, in addition to a water-insoluble aglycone. 3. the aglycone was identified as a cholestane derivative containing an unusual delta(24)-23-ketone system ... | 1970 | 5419749 |
| quaternary structure of the radular muscle myoglobin of the gastropod mollusc buccinum undatum l. | | 1969 | 5346852 |
| ultrastructure of the fibrous protein from the egg capsules of the whelk buccinum undatum. | | 1969 | 5813350 |
| investigations on the capacity of synthesizing 3 beta-sterols in mollusca. i. absence of 3 beta-sterol synthesis in a whelk, buccinum undatum l. | | 1967 | 4173499 |
| secretion of mucopolysaccharide in the whelk buccinum undatum l. | | 1967 | 4226685 |
| ultrastructure of hemocyanin components from the gastropod buccinum undatum. | | 1967 | 6025340 |
| the hypobranchial mucin of the whelk buccinum undatum l. the polysaccharide sulphate component. | 1. a polysaccharide sulphate has been isolated from the hypobranchial mucin of the whelk buccinum undatum. 2. the molecular weight of this polysaccharide, which is a glucan carrying one ester sulphate group per monosaccharide residue, is 1.7x10(5). 3. some investigations bearing on the location of the ester sulphate groups are reported. 4. the viscosity of the whole mucin has been shown to depend mainly on the glucan sulphate. | 1966 | 5941346 |
| aspects of the neurophysiology of buccinum undatum l. (gastropoda). ii. central organisation. | | 1966 | 5922733 |
| aspects of the neurophysiology of buccinum undatum l. (gastropoda). i. central responses to stimulation of the osphradium. | | 1966 | 5922732 |
| some effects of electrical stimulation and exogenous metabolites on the contractile activity and the ultrastructure of the radula-muscle of buccinum undatum. | | 1966 | 5988364 |
| the hypobranchial mucin of the whelk buccinum undatum l. properties of the mucin and of the glycoprotein component. | 1. the composition of the hypobranchial mucin from buccinum undatum is reported. 2. the amino acid composition was determined; aspartic acid and glutamic acid contribute almost 24% of the total amino acids in the mucin. 3. serine, threonine and alanine, in the proportions 2:1:1 respectively, were detected as n-terminal residues, implying the presence of at least four protein chains. 4. a glycoprotein component was isolated by phenol precipitation. 5. the glycoprotein contained 8% of neutral suga ... | 1965 | 5881659 |
| the polysaccharide sulphate-peptide complex in the hypobranchial mucin of buccinum undatum l. | | 1965 | 5852520 |
| [biochemical research on the inactivation of 5-hydroxytryptamine at the level of the heart in the mollusca helix pomatia, buccinum undatum, venus mercenaria and mya arenaria]. | | 1965 | 4221676 |
| characterization of the hypobranchial mucin of the whelk buccinum undatum l. | | 1963 | 14099650 |
| movement receptors in buccinum undatum. | | 1963 | 14113497 |