Publications

old species and new concepts in the taxonomy of pomacea (gastropoda: ampullariidae).	the taxonomic history of the south american genus pomacea perry, 1810, and some shifts of systematic concepts during recent decades are briefly reviewed. too many pre-evolutionist, shell-defined species created a gibberish, the only acceptable solution of which being perhaps a conventional, somewhat authoritarian decision based on expertise. the addition of other sources of morphological, biochemical, ecological or genetic information should not solve the problem if it is not accompanied by a so ...	2002	12058383
lipoproteins from plasma and perivelline fluid of the apple snail pomacea canaliculata.		2002	12058377
pigmented corpuscles in the midgut gland of pomacea canaliculata and other neotropical apple-snails (prosobranchia, ampullariidae): a possible symbiotic association.		2002	12058376
synthesis, distribution, and levels of an egg lipoprotein from the apple snail pomacea canaliculata (mollusca: gastropoda).	the site of synthesis of mollusc lipoproteins is hitherto unknown and was investigated for perivitellin 2 (pv2), an egg lipoprotein found in the freshwater snail pomacea canaliculata. tissues (albumen gland, gonad-digestive gland complex, and muscle) from vitellogenic females were incubated in vitro with 14c-leucine at 25 degrees c for 12 hr. at the end of incubation, soluble proteins from tissue homogenates and medium were analyzed for de novo protein synthesis by electrophoresis and hplc, and ...	2002	11857466
freshwater snails and schistosomiasis mansoni in the state of rio de janeiro, brazil: i-- metropolitan mesoregion.	in order to elaborate a planorbid chart of the state of rio de janeiro a survey of freshwater gastropods in the metropolitan mesoregion of this state was performed and revealed the occurrence of 20 species: antillorbis nordestensis (lucena, 1954); biomphalaria glabrata (say, 1818); biomphalaria schrammi (crosse, 1864); biomphalaria straminea (dunker, 1848); biomphalaria tenagophila (orbigny, 1835); burnupia sp.; drepanotrema anatinum (orbigny, 1835); drepanotrema cimex (moricand, 1839); drepanot ...	2001	11586447
permeability barrier in the mantle epithelium lining the testis in the apple-snail pomacea canaliculata (gastropoda: ampullariidae).	intercellular junctions are studied in the epithelium lining the testis of the freshwater snail pomacea canaliculata by conventional staining and lanthanum tracer techniques. the junctional complex consists of belt desmosomes and septate junctions. septate junctions are of the pleated-sheet type and they are constantly associated with mitochondria. gap and tight junctions appear to be absent. these septate junctions seem to be the structural correlate of an epithelial permeability barrier that s ...	2001	11392667
development of a penis from the vestigial penis in the female apple snail, pomacea canaliculata.		2000	11147712
properties of alpha-mannosidase partially purified from the apple snail, pomacea canaliculata.	pomacea canaliculata alpha-mannosidase (260 kda), composed of at least two isoforms with different pi, was partially purified. the activity was maximum at ph 4 and unaltered after incubation at 60 degrees c for 60 min. zncl2, cacl2, nacl, and sh-reagents increased the activity, while mncl2 and edta inhibited it. the enzyme catalyzed the hydrolysis of alpha 1-2, alpha 1-3, and alpha 1-6 mannosidic linkages.	1998	9972247
purification and some properties of a beta-xylosidase and an alpha-fucosidase from apple snails (pomacea canaliculata).	beta-xylosidase and alpha-fucosidase were purified from the viscera of apple snails (pomacea canaliculata) using ammonium sulfate precipitation, hydrophobic chromatography on butyl-toyopearl, gel filtration on sephacryl s-300, and q-sepharose column chromatography. beta-xylosidase and alpha-fucosidase are glycoproteins and their molecular masses were estimated to be approximately 85 kda and 54 kda by sds-polyacrylamide gel electrophoresis, and assumed to be about 96 kda and 230 kda from their se ...	1996	9063971
lipoproteins of the egg perivitelline fluid of pomacea canaliculata snails (mollusca: gastropoda).	the lipid and protein composition of the perivitelline fluid of the eggs of pomacea canaliculata was investigated. two lipoproteins (pv 1 and pv 2) and one lipoprotein fraction (pv 3) were detected for the first time in gastropods. they represent 57.0, 7.5, and 35.5% of the egg total proteins, respectively. pv 1 is a glyco-carotene-protein complex with characteristics of a very high-density lipoprotein (vhdl). it has 0.33% lipids, mainly free sterols and phospholipids. the particle has a mw of 3 ...	1996	8972583
purification and characterization of an alpha-l-fucosidase from pomacea canaliculata.	an alpha-l-fucosidase (ec 3.2.1.51) was isolated from the hepatopancreas of pomacea canaliculata. the enzyme was purified 285-fold from the crude enzyme extract by procedures involving first heat treatment, ammonium sulfate fractionation, second heat treatment, and chromatography on deae-sepharose, hydroxylapatite, and l-fucosylamine-ch-sepharose. when assayed by using p-nitrophenyl glycosides as substrates, the final preparation was free from other glycosidase activities and gave a single prote ...	1993	8470892
natural parasitic infection of the golden apple snail, pomacea canaliculata.	golden apple snails, pomacea canaliculata, were collected once a month during a year to search for their natural parasites. the collections were made at two localities having different ecological environments. of 576 collected snails from a canal, 176 individuals (30.6%) were infected by three groups of metacercariae. these parasites were amphistome, distome and echinostome metacercariae, which had prevalences of 23.5, 19.5 and 0.5%, respectively. the incidence of infection was highest (68.4% in ...	1993	8362292
sex ratio and susceptibility of the golden apple snail, pomacea canaliculata.	golden apple snails, pomacea canaliculata, were collected at two localities having different ecological environments. in both canal and pond, p. canaliculata males were found more than females during the dry season (summer and winter). in the canal, the male snails were highest in number (86.67%) in may. when rain started, they began decreasing and were lowest at 33.33% in august. of 575 snails collected, 30.6% were infected by one or more of the three groups of amphistome, distome and echinosto ...	1994	7855663
the inhibition of trypsin and some other proteases by ovorubin, a protein from the eggs of pomacea canaliculata.		1972	4263076
phylogenetic study of the arginine-vasotocin/arginine-vasopressin-like immunoreactive system in invertebrates.	1. a phylogenetic study of arg-vasotocin (avt)/arg-vasopressin (avp)-like immunoreactive cells was performed by the pap method in the central nervous system of invertebrates. 2. the immunoreactivity was detected in the nerve cells of hydra magnipapillata of the coelenterata; neanthes japonica and pheretima communissima of the annelida; pomacea canaliculata, aplysia kurodai, oncidium verrucosum, bradybaena similaris, achatina fulica, limax marginatus and meretrix lamarckii of the mollusca; gnorim ...	1988	2907440
phylogenetic study of the oxytocin-like immunoreactive system in invertebrates.	1. a phylogenetic study of oxytocin (oxt)-like immunoreactive cells was performed by the pap method in the central nervous system of invertebrates. 2. the immunoreactivity was detected in the nerve cells of hydra magnipapillata of the coelenterata; neanthes japonica and pheretima communissima of the annelida; oncidium verrucosum, limax marginatus and meretrix lamarckii of the mollusca; and baratha brassica of the arthropoda. 3. no immunoreactive cells were found in bipalium sp. of the platyhelmi ...	1988	2907439
hemocytes of pomacea canaliculata: i. reversible aggregation induced by ca2+.	using a platelet aggregometer, factors involved in hemocyte aggregation of a prosobranch snail pomacea canaliculata were investigated. aggregation-inducing tests revealed that extracellular ca2+ is required to provoke the cellular response which is reversible. the aggregation-dispersion response can be induced by adding ca2+ and edta alternately. aggregation was inhibited by a calmodulin antagonist n-(6-aminohexyl)-5-chloro-1-naphthalenesulfonamide (w-7) in a dose-dependent manner, and by a prot ...	1990	2369966
predation of pomacea canaliculata (ampullariidae) on adult biomphalaria peregrina (planorbidae).		1990	2331180
catadiscus pomaceae sp. n. (trematoda, paramphistomatidae) from pomacea canaliculata (lamarck, 1801) (prosobranchia, ampullariidae).	catadiscus pomaceae sp. n. from the intestine of the prosobranch mollusc pomacea canaliculata (lamarck, 1801), is described. the host snail was collected from a lenitic biotope belonging to the riachuelo basin (corrientes province, argentina) during 1985-1986. so far the species of the genus catadiscus cohn, 1904 have been recorded in amphibians and reptiles. this is the first instance of a species of that genus parasitizing a mollusc.	1992	1308560
occurrence of a blood group a-like substance in eggs of the prosobranch snail pomacea canaliculata.	in the eggs of the prosobranch snails pomacea canaliculata and pomacea insularum a blood group a-like substance has been detected by anti-a from the snails helix pomatia, helix aspersa and cepaea nemoralis.	1976	815102