Publications

[selection of genotypes of schistosoma mansoni and their maintenance by sporocyst transplantation].	schistosoma mansoni was isolated by hatching eggs obtained from a naturally infected rat in grand etang, guadeloupe; fifty biomphalaria glabrata were exposed to five miracidia each. the resulting cercariae were used to infect laboratory mice which were later sacrificed to provide worms for enzyme analyses and eggs for further infections. seven enzymes in extracts of individual worms were examined by isoelectric focusing in polyacrylamide gels: acp, g6pdh, pgm, gpi and hk showed no variation, whe ...	1984	6437612
spirulina as a nutrient source in experimental media for maintaining the schistosome vector, biomphalaria glabrata.		1984	6441531
an ultrastructural study of the effect of parasitism by larval schistosoma mansoni on the calcium reserves of the host, biomphalaria glabrata.	the tissues of biomphalaria glabrata contain three types of calcium cells which can be differentiated by their location and the size and number of their contained corpuscles. x-ray analysis has confirmed the presence of calcium and magnesium in the corpuscles. molluscs containing the larval stages of schistosoma mansoni at 40 days post infection show disintegration of the calcareous corpuscles in type-a calcium cells and erosion of the inner surface of the shell.	1984	6467339
experimental studies of age-prevalence curves for schistosoma mansoni infections in populations of biomphalaria glabrata.	we report the results of experimental studies of the generation of age-prevalence curves for schistosoma mansoni infections in laboratory populations of biomphalaria glabrata. within snail populations of varying sizes and age structures, the net force of infection is shown to be linearly dependent on the rate at which miracidia are introduced into the aquatic habitat of the host. for individual snails, the per capita force of infection is shown to be related to snail age and size, and the death ...	1984	6472887
schistosoma mansoni: passive transfer of resistance by serum in the vector snail, biomphalaria glabrata.	passive transfer of natural resistance to schistosoma mansoni (pr-1 strain) has been successfully accomplished in the snail intermediate host, biomphalaria glabrata (pr albino, m-line strain). injection of serum (cell-free hemolymph) from a naturally schistosome-resistant strain of b. glabrata (10-r2) into pr albino snails induced a complete protection from a primary infection with the parasite in 29 of 48 snails (60.4%). in comparison, inoculation of homologous pr albino serum or heterologous p ...	1984	6479289
role of cellular and humoral components in the encapsulation response of biomphalaria glabrata to schistosoma mansoni sporocysts in vitro.		1984	6483876
genetic selection for tolerance to niclosamide and copper in biomphalara glabrata (mollusca: pulmonata).	successive generations of the pr-79 and m-line laboratory stocks of biomphalaria glabrata were exposed in the lc90 of niclosamide or copper sulfate. survivors from each generation produced the succeeding generation by self fertilization. the pr-79 stock showed no evidence of tolerance to either molluscicide following five generations of selection. on the other hand, m-line f5 snails demonstrated approximately two-fold higher tolerance to both molluscicides than did non-selected m-line snails.	1984	6495387
isolation, characterization and functional assessment of a hemagglutinin from the plasma of biomphalaria glabrata, intermediate host of schistosoma mansoni.	an agglutinin from the plasma of biomphalaria glabrata, vector of schistosoma mansoni, has been isolated and partially characterized. its isolation is a simple two-step process, yielding an essentially pure preparation that can then be manipulated free from other plasma components. it is a large glycoprotein (10(6) daltons), found in four of the five snail strains tested, and possesses affinity for galactose-type sugar residues. based upon criteria such as molecular weight, carbohydrate and eryt ...	1984	6500135
chronobiological aspects of the host-parasite relationships between biomphalaria glabrata and schistosoma mansoni: cercarial production and infectivity, and growth kinetics of the host.		1984	6501917
intergeneric reproductive stimulation and parthenogenesis in schistosoma mansoni.	when mice were infected with female cercariae of schistosoma mansoni and male cercariae of schistosomatium douthitti, many mixed pairs formed. the paired females were approximately the same size as those in unisexual infections, far smaller than females paired with s. mansoni males. although the sch. douthitti males possessed well-developed testes, sperm were not found in their female partners, which developed scanty vitelline glands and produced laterally spined eggs typical of s. mansoni. such ...	1984	6504564
[in vitro development of hemolymph granulocytes of biomphalaria glabrata (gastropoda, planorbidae). study by scanning electron microscopy].	the morphological evolution in vitro of biomphalaria glabrata granulocytes on a cover-glass is described by scanning electron microscopy. 4 stages have been characterized: stage 1: globular cells showing low adhesion to cover-glass; stage 2: flattened cells in contact with substrate over a large surface, which present two well differentiated cytoplasmic zones: an endoplasm in which the nucleus is embedded and an ectoplasm which extends into very thin filopodia with a spherical terminal bulb; sta ...	1984	6508142
is planorbarius metidjensis compatible with schistosoma haematobium and s. bovis?	on the basis of laboratory snail infection experiments it is concluded that planorbarius metidjensis is unimportant in the epidemiology of schistosoma haematobium in north west africa. 410 p. metidjensis spain were exposed to 8 isolates of s. haematobium from ghana, kenya, madagascar, mauritius, morocco, tanzania, south africa and sudan. 50 p. metidjensis morocco and 50 p. metidjensis algarve were exposed to s. haematobium morocco. all infections failed to develop to maturity. serial sections of ...	1984	6509700
[activities of a schistosoma mansoni focus of transmission in martinique (french antilles)].	a focus of intestinal schistosomiasis was discovered in november 1981 in martinique in the saint-pierre area. an analysis of its structure and of the mecanisms of the transmission of the parasite was carried out between 1981 and 1983. this focus presents the following particularities: a transmission site very small constituted by water cress beds; a small human population infected with a prevalence of 13% (positive stools) to 41,3% (positive serologies); a weak fecal contamination of the water; ...	1984	6524823
the adenylate nucleotide pool in the digestive gland-gonad complex of biomphalaria glabrata infected by schistosoma mansoni.	the levels of adenylate nucleotides were examined in the digestive gland and ovotestes of biomphalaria glabrata during cercarial shedding of schistosoma mansoni, 10 weeks post-infection. in general, parasitization resulted in decreases in the adenylate levels in both tissues, but the results were not statistically significant. moreover, the energy charge ratio was not significantly altered. the mean energy charge in ovotestes from uninfected and infected individuals was 0.81 and 0.77, respective ...	1984	6527694
competitive interactions between species of freshwater snails. i. laboratory studies: ib. comparative studies of the dispersal and the vagility capabilities of biomphalaria glabrata and biomphalaria straminea.	experiments reported in the current paper, carried out under semi-field conditions created in the laboratory, have shown that b. straminea has competitive superiority when compared with b. glabrata. the former species has shown higher capabilities of both dispersal and vagility. in addition, b. straminea was able to compete successfully with b. glabrata.	2006	6535913
[biomphalaria glabrata in the state of piaui].	the occurrence of biomphalaria glabrata is recorded for the first time in the state of piaui, where it was collected from several breeding places in the city of parnaíba. examination of 694 specimens showed that a part of them were infected with trematodes other than schistosomatidae. so far no autochthonous cases of schistosomiasis have been identified in the city. the presence of b. glabrata in parnaíba extends by 20 km eastward its range on the northern coastal region of the great northeaster ...	1984	6535921
[new foci of transmission of schistosoma mansoni in the state of pará].	two new foci of transmission of schistosoma mansoni in the state of pará are recorded, with the finding of naturally infected biomphalaria glabrata in the municipalities of viseu and belém. uninfected specimens of biomphalaria straminea, as well as the planorbid species biomphalaria schrammi, drepanotrema lucidum and d. anatinum, were found in the same area.	1984	6535922
comparison of the rhythmic emergence of schistosoma mansoni cercariae from biomphalaria glabrata in different lighting regimens.		1984	6541689
[chemoprophylaxis of schistosomiasis: molluscacidal activity of natural products--assays with adult snails and oviposition].	data concerning the molluscicidal activity of 159 extracts from 84 brazilian plants on biomphalaria glabrata, the most important intermediate host of schistosoma mansoni in brazil, are presented. seventy eight extracts (49,0%) showed activity against snails or eggs, but only twenty nine (18.2%) were active on both, snails and eggs. extracts of two species (mikania hirsutissima and qualea multiflora) have shown to be lethals to adult snails at 10 ppm concentration.	1984	6548884
altered feeding response as a cause for the altered heartbeat rate and locomotor activity of schistosoma mansoni-infected biomphalaria glabrata.	biomphalaria glabrata infected with schistosoma mansoni for 33 days fed more often than uninfected snails. whereas uninfected snails had nocturnal increases in feeding, snails with a 33-day-old infection of s. mansoni fed as often during the day as in the night. using direct observation and film analysis, we found that feeding increased the heartbeat rate and locomotor activity of b. glabrata. when snails were allowed to feed ad lib., infected snails had higher heartbeat rates than uninfected sn ...	1983	6631636
effects of alterations in the heartbeat rate and locomotor activity of schistosoma mansoni-infected biomphalaria glabrata on cercarial emergence.	during a 27-hr period of food deprivation, biomphalaria glabrata infected with schistosoma mansoni had lower heartbeat rates and locomotor activities than did controls that were feeding ad lib. however, there was no difference between the cercarial emergence from control and experimental snails either before, during, or after the period of food deprivation. no correlation was found between the locomotor activity of the snail and the number of cercariae emerging from the snail in continuous light ...	1983	6631637
chronic exposure of the eggs and adults of biomphalaria glabrata (say) to the molluscicide, nicotinanilide.	some effects of chronic, low-dosage treatment of biomphalaria glabrata eggs and adults with nicotinanilide, are reported. the susceptibility of eggs decreased with age. the development and hatching of 0-1 day old eggs could be prevented by continuous exposure to 0.0005-0.001 mg/l-1 whereas prehatch stages had a susceptibility similar to that of adult snails (0.1-0.2 mg/l-1). the possible use of slow-release formulations of nicotinanilide in the control of field populations of snails and schistos ...	1983	6636300
purine metabolism in biomphalaria glabrata under starvation and infection with schistosoma mansoni.	purine content and its alterations during a starvation period of 29 days and an infection period of 52 days were studied. during starvation the amount of uric acid increased from 2.11 +/- 0.95 mg/g dry wt in control snails to a maximum of 6.73 +/- 3.99 mg/g dry wt on day 29 of starvation for uric acid and from 4.73 +/- 2.10 mg/g dry wt in control snails to a maximum of 11.29 +/- 3.48 mg/g dry wt on day 23 of starvation for guanine. during infection there was an increase with both uric acid and g ...	1983	6641159
[experimental infection of biomphalaria glabrata with schistosoma mansoni by the injection of miracidia].		1983	6672864
lysosomal enzyme activities in susceptible and refractory strains of biomphalaria glabrata during the course of infection with schistosoma mansoni.	the distribution and abundance of the lysosomal enzyme markers, acid phosphatase (ap), peroxidase (po), and nonspecific esterase (ne), within circulating blood cells (hemocytes) were examined in a schistosome-susceptible (pr albino m-line) and a resistant (10-r2) strain of biomphalaria glabrata during the course of infection with schistosoma mansoni. the dynamics of serum (cell-free hemolymph) ap activities and total hemocyte numbers in infected snails also were investigated. hemocyte subpopulat ...	1983	6674450
[biological control: helobdella triserialis lineata blanchard, 1849 (hirudinea: glossiphonidae) on biomphalaria glabrata say, 1818 (mollusca: planorbidae), in the laboratory].		1983	6675164
[microflora and microfauna of the habitat of biomphalaria glabrata (say, 1818)].		1983	6680234
the ultrastructure of the amebocyte-producing organ in biomphalaria glabrata.	the amebocyte-producing organ (apo) in normal and echinostome-sensitized biomphalaria glabrata was studied at the ultrastructural level. the apo in unexposed snails consists of small clusters of primary ameboblasts resting on the epithelial cells lining the pericardium. the ameboblasts are held in a loose reticulum formed by extensions from smooth muscle and few fibroblastic cells. secondary ameboblasts and amebocytes constitute further stages of this cell line. amebocytes, resembling cells in t ...	1983	6683673
specificity of ovulation hormones of some basommatophoran species studied by means of iso- and heterospecific injections.	isospecific injections of intercerebral commissure (com) extracts of l. stagnalis, l. palustris, and l. ovata (lymnaeidae) and of extracts of com/mediodorsal bodies complexes (com/db) of bulinus truncatus (bulinidae) and biomphalaria glabrata (planorbidae) induced oviposition in a high percentage of the experimental snails. positive results of heterospecific injections between the first three species indicated a likely structural similarity of the ovulation hormones within the genus lymnaea. the ...	1983	6685080
[effect of metallic magnesium and various magnesium salts on the oviposition of biomphalaria glabrata (say, 1818)].		1983	6689541
schistosoma mansoni: long-term maintenance of clones by microsurgical transplantation of sporocysts.	schistosoma mansoni sporocysts originally derived from monomiracidially infected biomphalaria glabrata snails were serially transplanted into the cephalopedal sinus of anesthetized snails by the microsurgical implantation of fragments of parasitized hepatopancreas and ovotestis. three to six passages each of five male and five female clones were maintained for as long as 2.0 years. of the recipient snails which survived surgery, 87% released cercariae, usually beginning 5-7 weeks after surgery. ...	1984	6692880
[experimental schistosomiasis iii. observations on the infestation of biomphalaria glabrata by a miracidium of schistosoma mansoni].	380 b. glabrata infected with 1 miracidium of s. mansoni produced 87 positive snails (22,9%), 38 of which sending out male cercariae and 49 female cercariae. the snails belonged to 3 experimental series kept at 27 degrees and 24 degrees c for 15 weeks under continuous lighting. there was no difference between the proportions of both sexes. the survival of the positive snails was favoured by the male sex. the shedding of female cercariae was greater than shedding of male. during those 15 weeks, t ...	1984	6721371
an ultrastructural study on ventricular encapsulation reactions in biomphalaria glabrata exposed to irradiated echinostome parasites.		1984	6735576
equations for describing growth of the schistosome host snail biomphalaria glabrata.	biomphalaria glabrata and stagnicola palustris were raised in aquaria under crowded and uncrowded conditions. measurements of greatest shell diameter were taken at regular intervals. von bertalanffy and logistic growth curves were fitted by least squares and maximum likelihood methods. the resulting parameter estimates produced better fits for the logistic equation than for the von bertalanffy equation.	1984	6737172
effects of temperature on the larval development of angiostrongylus cantonensis in the intermediate host, biomphalaria glabrata.	the effects of temperature on the larval development of angiostrongylus cantonensis in biomphalaria glabrata were studied under controlled conditions. when b. glabrata were maintained at different, constant temperatures, the first-stage larvae developed to third-stage larvae between 20 degrees and 31 degrees c. the velocity of development to the third-stage in the snail depended on the relationship, y = -0.1281 + 0.0081 x (y velocity of development; x rearing temperature). the "threshold of deve ...	1984	6741223
schistosoma mansoni: agglutination of sporocysts, and formation of gels on miracidia transforming in plasma of biomphalaria glabrata.	the resistance or susceptibility of biomphalaria glabrata strains to strains of schistosoma mansoni, the human blood fluke, are evidenced by the responses of snail hemocytes to sporocysts of the schistosome, both in vivo and in vitro. it is now reported that living sporocysts of the pr1 strain of s. mansoni agglutinate in the plasma of all tested strains of b. glabrata, in contrast to fixed sporocysts which agglutinate only in plasma from resistant snail strains. the agglutinating activity in re ...	1984	6745386
infectivity of a microsporidium of mosquitoes (nosema algerae) to larval stages of schistosoma mansoni in biomphalaria glabrata.		1980	6778833
schistosoma mansoni: quantification of skin penetration and early migration by differential external radioassay and autoradiography.	eleven gamma-emitting radionuclides (49sc, 54mn, 59fe (+2 and +3), 60co, 65zn, 75se (as selenomethionine, selenocystine, selenite and selenate), 109cd, 125sb, 133ba, 137cs and 203hg) were screened as labelling agents for schistosoma mansoni cercariae by incubation of infected biomphalaria glabrata snails in radioactive solution according to the technique of christensen (1977). only [75se]methionine yielded satisfactorily labelled cercariae. multiple regression analysis of volume, number of cerca ...	1982	6803218
properties of glycogen synthase and phosphorylase from biomphalaria glabrata (mollusca).	glycogen synthase and phosphorylase were characterized from the cephalopedal region of the snail, biomphalaria glabrata. glycogen synthase exhibited increases and decreases in its activity ratio (-g6p/+g6p) under conditions that are known to cause conversion of the two forms of the enzyme from mammalian systems, implying that the snail's synthase also possesses interconvertible forms. each form had a distinct ph optimum, with the g6p-independent form (synthase alpha) exhibiting maximum activity ...	1982	6804613
effect of schistosoma mansoni on glycogen synthase and phosphorylase from biomphalaria glabrata (mollusca).		1982	6804614
laboratory comparison of the relative success of biomphalaria glabrata stocks which are susceptible and insusceptible to infection with schistosoma mansoni.	a method of interrupting the life-cycle of the human blood fluke schistosoma by increasing the proportion of genetically insusceptible intermediate host snails in natural populations was first proposed nearly 25 years ago. the method assumes that insusceptible snails will be at a selective advantage over susceptible snails when the schistosome parasite is present, and therefore natural selection will act to increase the proportion of alleles for insusceptibility. a major objection to the propose ...	1983	6856336
acquired resistance in snails. induction of resistance to schistosoma mansoni in biomphalaria glabrata.		1983	6874229
displacement of biomphalaria glabrata by the snail thiara granifera in field habitats in st. lucia, west indies.	thiara granifera is a melaniid snail capable of maintaining very high densities in a variety of habitats. it has been introduced into the new world from the far east and is now spreading rapidly throughout the caribbean. in puerto rico and dominica casual observations following natural invasion by t. granifera suggest that it may exert a powerful restraining influence on populations of biomphalaria glabrata, the major intermediate host of schistosoma mansoni in the caribbean. the potential of t. ...	1983	6882056
surface antigens of biomphalaria glabrata (gastropoda) hemocytes: evidence for linkage-independence of some hemolymph-like surface antigens and con a receptor-bearing macromolecules.		1983	6886469
[investigations on periodic phenomena in the snail biomphalaria glabrata (author's transl)].	a method was developed to measure the locomotive activity of biomphalaria glabrata over long periods of time. a snail, radioactively marked with a co57-source, moves on a circular path. beneath the experimental vessel a lead disc with a slit revolves (one revolution per minute) over a counter tube. once every minute the amount of radioactivity emitted falls through the slit onto the counter tube. the position and thence the locomotive activity of the snail is determined from the intervals betwee ...	1981	6894208
[comparative study of reproduction in 4 genetic varieties of biomphalaria glabrata (say 1818). ii - embryonal development, hatching and loss of eggs and embryos].		2006	6895122
introduction of biomphalaria glabrata to egypt and other african countries.		1982	6926781
edema-horn, an abnormal mutant of biomphalaria glabrata.		1980	6928918
concanavalin a-induced receptor redistribution on biomphalaria glabrata hemocytes: characterization of capping and patching responses.		1981	7024423
[effect of temperature on cultures of biomphalaria glabrata (say) in the laboratory].		2009	7034063
concanavalin a-mediated phagocytosis of yeast by biomphalaria glabrata hemocytes in vitro: effects of temperature and lectin concentration.		1982	7045238
ribeiroia marini: irradiated miracidia and induction of acquired resistance in biomphalaria glabrata.		1982	7056343
evaluation of chemotherapy in the control of schistosoma mansoni in marquis valley, saint lucia. ii. biological results.	following the final chemotherapy campaign of a 4-year program, the biological assessment of transmission of schistosoma mansoni was evaluated for 5 years. no infected biomphalaria glabrata were found amongst 28,791 and 13,550 snails examined from flowing and static index sites, respectively. however, 89 infected snails of 16,602 examined (0.54%) were found from additional sites. sentinel snails examined between march 1974 and october 1977 revealed no infections and their use was discontinued. fo ...	1982	7058972
ultrastructure of encapsulation of schistosoma mansoni mother sporocysts by hemocytes of juveniles of the 10-r2 strain of biomphalaria glabrata.	dynamic aspects of the cellular responses of juvenile (2-3 mm shell diameter) 10-r2 strain biomphalaria glabrata to newly penetrated schistosoma mansoni (nih-sm-pr-1 strain) were studied at the ultrastructural level. as early as 3 hr postexposure (pe), host hemocytes had contacted the parasite's surface and by 7.5 hr, had phagocytosed sporocyst microvilli and small pieces of underlying tegument. most sporocysts observed at 24 hr pe lacked tegumental cytoplasm, and germinal cells and other intern ...	1982	7077450
predation of the snail biomphalaria glabrata by freshwater shrimps in st. lucia, west indies.		1982	7082076
lectin-induced mitogenesis of cytotoxic amebae (nuclearia) isolated from biomphalaria glabrata (mollusca:gastropoda).		1982	7095235
further characterization of acquired resistance in biomphalaria glabrata.	the albino strain of biomphalaria glabrata is capable of developing an acquired resistance to echinostomes that is relatively specific, i.e., strong against echinostoma lindoense, challenged by the homologous species, moderate or weak against closely related e. paraensei and e. liei, and nonexistent against paryphostomum segregatum and schistosoma mansoni. the present results show that acquired resistance induced by e. paraensei is much stronger against the heterologous e. lindoense than against ...	1982	7119983
swellengrebel lecture: survival of schistosoma mansoni and other trematode larvae in the snail biomphalaria glabrata. a discussion of the interference theory.		1982	7123644
in vitro encounters between schistosoma mansoni primary sporocysts and hemolymph components of susceptible and resistant strains of biomphalaria glabrata.	encounters between axenically transformed sporocysts of the puerto rican 1 strain of schistosoma mansoni and hemocytes and plasmaaa components of susceptible "m line" and resistant 10-r2 and 13-16-1 strains of biomphalaria glabrata were studied in vitro. after 24 hours of incubation in susceptible hemolymph components, 94.4% of 36 observed sporocysts retained normal structure, whereas 9l.6% of 48 sporocysts were destroyed after 24 hours of incubation in resistant hemolymph components. sporocysts ...	1982	7125067
[evaluation of 10 years of research on s. mansoni schistosomiasis a in the french west indies].	from 1971 until 1982, we studied the ecological factors which stead fast a perennial schistosomiasis in guadeloupe on an exhaustive mode. more recently, we start a similar investigation in martinique. in guadeloupe the single vector of schistosoma mansoni is the snail biomphalaria glabrata which is an ubiquist species. but the transmission to man is restricted to the "canal-sewers" where faeces are dropped and not in the rivers of basse-terre or the ponds of grande-terre. moreover, the infection ...	1982	7126776
amebocytic accumulations in biomphalaria glabrata: fine structure.	internal pathologic conditions in four stocks of biomphalaria glabrata involve amebocytes. most snails exhibiting these conditions are also nonsusceptible to infection with schistosoma mansoni. fine structure studies reveal that periaortic and atrial amebocytic accumulations show two responses that involve heart tissue: a generalized response in which amebocytes have infiltrated the myocardium and focal areas of nodules in which heart tissue is encapsulated and destroyed. in pericardial accumula ...	1982	7128891
[tagging of biomphalaria glabrata snails by means of radionuclides for field trials].		2013	7144545
[outline of the technic for tagging biomphalaria glabrata snails with radiostrontium].		2013	7144550
transmission of schistosoma mansoni from man to snail: laboratory studies on the influence of snail and miracidial densities on transmission success.	the relationship between infection success, the density of schistosoma mansoni miracidia and the density of the snail host biomphalaria glabrata was examined experimentally. within laboratory infection arenas, the distribution of miracidial infections/snail was approximately uniform and the net rate of snail infection was directly positive binomial to miracidial density. in contrast, however, the rate of infection declined exponentially as snail density increased. mathematical models are develop ...	1982	7145477
population structure in biomphalaria glabrata: examination of an hypothesis for the patchy distribution of susceptibility to schistosomes.	it has been suggested that the patchy distribution of snail susceptibility to schistosomes might be due to genetic drift. since direct estimation of genes for susceptibility is not feasible in population studies, electrophoretic techniques were used to examine this hypothesis for populations of biomphalaria glabrata from puerto rico. these populations were characterized by relative genetic homogeneity within populations and differentiation among local populations. the data presented are consiste ...	1982	7149103
effects of starvation and infection with schistosoma mansoni on the release rate of free amino acids (faa) by biomphalaria glabrata.	1. the elimination of dissolved free amino acids (faa) by individual snails during a period of 2 hr was measured. the faa concentration in the hemolymph and in the homogenate also was determined. 2. for uninfected, normally fed snails a daily faa production of 0.7 +/- 0.25 mumol glycine equivalents/g live wt was found. with snails starving for 7 days the daily faa release rate fell to a mean value of 0.44 +/- 0.19 mumol glycine equivalents/g live wt. infection with schistosoma mansoni, however, ...	1982	7172633
use of praziquantel in patients with schistosomiasis mansoni previously treated with oxamniquine and/or hycanthone: resistance of schistosoma mansoni to schistosomicidal agents.	fourteen patients with active schistosomiasis mansoni in spite of previous treatment with oxamniquine and/or hycanthone were treated with praziquantel, single oral dose of 45 to 50 mg/kg body-weight. all underwent clinical, laboratory and electrocardiographic examination before and after treatment. untoward effects (dizziness, drowziness, nausea and abdominal pain) were observed in ten. laboratory findings disclosed no significant alteration and the electrocardiograms showed no abnormalities. mo ...	1982	7179419
[comparative study of the susceptibility of biomphalaria glabrata populations of belo horizonte (mg), to schistosoma mansoni infection and to molluscacides].		1982	7182912
echinostoma liei miracidia and biomphalaria glabrata snails: effect of egg age, habitat heterogeneity, water quality and volume on infectivity.		1980	7189513
lectin-binding specificities of hemocytes from two strains of biomphalaria glabrata as determined by microhemadsorption assays.		1980	7192226
resistance to schistosome infection in biomphalaria glabrata induced by gamma radiation.		1981	7196934
experimental epidemiology of schistosomiasis. ii. prepatency of schistosoma mansoni in biomphalaria glabrata at diurnally fluctuating temperatures.	the basic hyperbolic relationship established between constant water temperatures and the length of the prepatent period in the snail was tested as diurnally fluctuating temperatures, stimulating natural conditions. diurnal temperature variations are generally summed up by s. mansoni according to the time-temperature product and are independent of the shape of the temperature curve. using a simple hyperbolic formula, the time of prepatency can be calculated for temperatures ranging from 16 degre ...	1981	7198850
[life cycle of clinostomum golvani n. sp. (trematoda : clinostomidae) a larval parasite of biomphalaria glabrata, the snail vector of schistosoma mansoni in guadeloupe (author's transl)].	the life cycle of a new species of clinostomidae, clinostomum golvani, described in guadeloupe (french west indies). the first intermediate host is the snail vector of schistosoma mansoni in this island, biomphalaria glabrata, which can be sterilized by this parasite. poecilia reticulata (guppy) serves as the second intermediate host. adult worms were obtained under experimental conditions from butorides virescens (the definitive host in nature), nycticorax nycticorax and ardea purpurea. the adu ...	1980	7224533
[melamine action on biomphalaria glabrata say (mollusca, gasteropoda) (author's transl)].		1980	7244530
[specificity and active principle of bacillus thuringiensis var. israelensis].	bio-assays of b. thuringiensis var. israelensis on larvae of drosophila melanogaster, musca domestica, culicoides sp. and chironomus plumosus are negative except in the last case, but only with doses much higher than those which are lethal for mosquito larvae. tests on mollusks (biomphalaria glabrata) and golden fishes are also negative. the specificity of action of the h 14 serotype, limited to a few diptera families, should be mainly related to the special characteristics of its crystals, whic ...	1981	7249246
lack of resistance of the snail biomphalaria glabrata after nine years of exposure to bayluscide.		1981	7268836
dynamics of larval populations of schistosoma mansoni in biomphalaria glabrata. i rhythmic production of cercariae in monomiracidial infections.		1981	7271357
schistosoma mansoni, nih-sm-pr-2 strain, in susceptible and nonsusceptible stocks of biomphalaria glabrata: comparative histology.	of 10 inbred stocks of biomphalaria glabrata examined, eight were susceptible to the nih-sm-pr-1 strain (pr-1) of schistosoma mansoni, whereas only three were susceptible to the nih-sm-pr-2 strain (pr-2). by employing a histological ranking system based on parasite development and host tissue response, we have observed a range of nonsusceptibility among stocks nonsusceptible to pr-2. in three nonsusceptible stocks, sporocysts were rapidly surrounded by host amebocytes and were destroyed within a ...	1981	7299581
[contribution to the study of nervous system in larval and adult forms of schistosoma mansoni sambon, 1907 (trematoda digenea). ii. role of serotonine and dopamine (author's transl)].	this study provides details concerning the localization and role of 5-ht and da in schistosoma: 1) 3h-5ht is incorporated selectively by the nerve fibers containing dense granules measuring 820 +/- 20 a (type 2 granules), combined at times with other structures; the presence of "cold" dopamine in the environment does not alter the incorporation; 2) 3h-da is also incorporated in vitro by the nerve fibers and occasionally by the muscle fibers of the adult schistosoma; 3) neither the intraovular mi ...	1981	7316398
dynamics of larval populations of schistosoma mansoni in biomphalaria glabrata ii. chronobiology of the intramolluscal larval development during the shedding period.		1981	7316580
distribution and variation of hemagglutinating activity in the hemolymph of biomphalaria glabrata.		1981	7320518
the behavior of biomphalaria glabrata (gastropoda: pulmonata) hemocytes following exposure to lectins.		1981	7324324
schistosoma mansoni: effect on growth, fertility, and development of distal male organs in biomphalaria glabrata exposed to miracidia at different ages.	growth, egg laying rate, and mortality of biomphalaria glabrata (portorican strain), maintained in groups of two, after exposure at different ages (1, 2, 4, 6, 8 weeks) to three miracidia each of schistosoma mansoni (liberian strain) were determined. the findings in infected snails were compared with those in exposed but uninfected (negative) and in unexposed snails. younger snails were infected at higher rates, and these showed a significantly increased mortality. young infected snails grew muc ...	1981	7324545
selective interference with granulocyte function induced by echinostoma paraensei (trematoda) larvae in biomphalaria glabrata (mollusca).	various trematode larvae can interfere with the host snail's resistance to the same or unrelated trematode species, chiefly, it appears by interference with the function of the host's granulocytes. in biomphalaria glabrata infected with the trematodes, echinostoma paraensei, granulocytes lose their ability to encapsulate the larvae of trematodes to which the hosts were previously resistant. however, the granulocytes in these snails retain their ability to encapsulate injected latex spheres, or l ...	1981	7328451
reduction in transmission of schistosoma mansoni by a four-year focal mollusciciding programme against biomphalaria glabrata in saint lucia.	the effect of transmission of schistosoma mansoni of a focal snail control programme was investigated over four years amongst approximately 1250 people living in five communities in the steep-sided soufriere river valley, st. lucia, west indies. bayer 6076 was applied from constant flow drip cans to 12 stream sections at a target dose of 8 mg/litre clonitralide every four weeks. only proven and potential transmission sites were treated; marsh habitats, where biomphalaria glabrata were widespread ...	1981	7330940
[evolution of spopocysts of schistosoma mansoni sambon 1907 in biomphalaria glabrata (say 1818) and biomphalaria tenagophila (d'orbigny 1835)].		1981	7336119
genetic variation among laboratory strains of the planorbid snail biomphalaria glabrata.	isozymes of laboratory strains of biomphalaria glabrata have been studied by starch gel electrophoresis. methods are outlined for adaptation of this technique to the genetic study of these snails. twenty-eight presumptive gene loci have been identified. twelve invariant enzymes were observed. sixteen loci displayed some polymorphism within or among the strains. these polymorphisms were generally widespread among strains from brazil, puerto rico, st. lucia, and the dominican republic. a high degr ...	1981	7337694
[susceptibility to schistosoma mansoni infection of biomphalaria glabrata and biomphalaria tenagophila in the federal district, brazil].		1981	7345560
[behavior of biomphalaria glabrata (say, 1818) as a criterion of toxicity in biological trails with molluscacides].		2013	7348773
nonhemocyte sources of selected lysosomal enzymes in biomphalaria glabrata, b. tenagophila and b. straminea (mollusca: pulmonata).		2007	7348779
therapeutic efficacy of oral oxamniquine in the toxemic form of schistosomiasis mansoni: treatment of eleven individuals from two families, and experimental study.	two families, comprising 11 individuals in the toxemic form of schistosomiasis mansoni, infected in belo horizonte, brazil were treated. parasitological cure was obtained in 5 (45%) of the patients after a single oral dose of oxamniquine (mansil), 20 mg/kg body weight. no significant side effects were observed. to evaluate the possibility of resistance to the drug, cercariae collected from biomphalaria glabrata infected with micracidia from eggs obtained from three of the individuals not cured w ...	1980	7352627
the destruction of schistosoma mansoni mother sporocysts in vitro by amoebae isolated from biomphalaria glabrata: an ultrastructural study.		1980	7365267
genetic studies on amebocytic accumulations in biomphalaria glabrata.		1980	7365268
leucocytosis in biomphalaria glabrata sensitized and resensitized to echinostoma lindoense.		1980	7365269
differential leukocytic responses of biomphalaria glabrata to infection with schistosoma mansoni.		1980	7365270
biomphalaria glabrata amoebocytes: effect of schistosoma mansoni infection on in vitro phagocytosis.		1980	7373069
abnormal growths from the digestive gland of biomphalaria glabrata.		1980	7373070
experimental pathogenicity of vibrio parahaemolyticus for the schistosome-bearing snail biomphalaria glabrata.	the bacterium vibrio parahaemolyticus was found to be pathogenic for the schistosome intermediate host biomphalaria glabrata (say). when administered topically, a nonenteritis-associated strain of the bacterium had an ld50 (median lethal dose) of 6.8 x 10(7) cells per snail. a 5% trichloroacetic acid (tca) extract from v. parahaemolyticus was found to kill b. glabrata. sublethal effects of v. parahaemolyticus include shell deterioration and increased heart rate. both albino aquarium populations ...	1980	7378944
biogenic amine metabolism in biomphalaria glabrata i. catechol-o-methyltransferase activity.	in contrast to mammalian tissues, catechol-o-methyltransferase (comt) activity is localized predominantly, if not entirely, in the cytosolic fraction in the tissues of biomphalaria glabrata. enzymatic activity is greater in glycylglycine and tris-cl buffers than in phosphate buffer. the ph optimum for this enzymatic reaction is 8.5. the catalysis is stimulated by magnesium ion, other divalent cations are less effective in this reaction. the km values for 3,4-dihydroxybenzoate and s-adenosylmethi ...	1980	7390704
macrophagelike hemocytes of resistant biomphalaria glabrata are cytotoxic for sporocysts of schistosoma mansoni in vitro.	when schistosoma mansoni miracidia penetrate resistant individuals of the intermediate host snail biomphalaria glabrata, the sporocyst is encapsulated by hemocytes (macrophagelike cells of the snail circulation) and killed. in our in vitro model the same fate requires only sporocysts and snail hemolymph. however, when cultured in plasma alone (cell-free hemolymph), sporocysts remain viable for more than 3 days, regardless of whether the plasma is from susceptible or resistant snails. when hemoly ...	1980	7391885