Publications

the molluscicidal properties of natural products from ambrosia maritima.	the molluscicidal properties of damsin "i", ambrosin "ii", and tribromodamsin "iii" were investigated against the intermediate hosts of schistosomiasis biomphalaria alexandrina and bulinus truncatus. although damsin was to some extent more toxic against b. alexandrina than the other two compounds, it was less toxic than them against b. truncatus after 24 hr exposure periods. there is a flex relationship between concentration of damsin and exposure period to prodce 100% mortality. the molluscicid ...	1999	23941
control of snail hosts of bilharziasis in egypt. 3. effect of the organophosphorous insecticide, dursban, on carbohydrate metabolism of the snails biomphalaria alexandria and bulinus truncatus.	the effects of the organophosphorous insecticide, dursban, on aerobic oxidation, glycolysis, glucose utilization and gluconeogenesis in snails tissues were determined. dursban had a biphasic effect on the aerobic oxidation of succinate, glutamate + malate and tmpd + ascorbate while it had only an inhibitory action on pyruvate oxidation. the compound significantly inhibited glycolysis, glucose utilization and gluconeogenesis when used at high concentrations (ten times higher than its lc50). howev ...	1975	52436
effect of certain insecticides in the control of the fresh water snails, biomphalaria alexandrina and bulinus truncatus.		1975	67018
the influence of temperature, darkness, and starvation on growth and survival of helisoma duryi, biomphalaria alexandrina and bulinus truncatus.	the influence of 10 degrees, 18 degrees, 26 degrees, 28 degrees and 33 degrees c, different periods of complete darkness and starvation on growth and survival of h. duryi, b. alexandrina and b. truncatus were studied. the optimum temperature for the growth and survival was about 26 degrees c. survivorship and growth rates decreased proportionately according to starvation period. however, darkness had no significant effect on the growth of b. truncatus and h. duryi. under the chosen experimental ...	1979	122361
ecological studies of bulinus rohlfsi, the intermediate host of schistosoma haematobium in the volta lake.	in the present ecological study of cercarial transmission of schistosoma haematobium in the volta lake, ghana, habitat observations and sampling of bulinus truncatus rohlfsi were conducted within a 60-km stretch of shoreline. observations revealed that human water contact sites in each village undergo constant changes in shape and vegetation. snail sampling surveys in water contact sites were carried out monthly (for 27 months) in 8 villages using newly designed palm-leaf traps, and in 8 additio ...	1977	304396
trials of ecological and chemical measures for the control of schistosoma haematobium transmission in a volta lake village.	urinary schistosomiasis is highly prevalent along the shores of the volta lake in ghana, where transmission occurs focally in man-water contact sites. the intermediate host, bulinus truncatus rohlfsi, prefers to harbour in ceratophyllum, a common aquatic weed in the lake. removal of this weed reduced the density of both infected and uninfected snails, but not sufficiently to interrupt transmission.niclosamide was applied at 1, 0.7, and 0.5 mg/l in combination with weed removal at five water cont ...	1978	307458
investigation of molluscicidal activity of certain sudanese plants used in folk-medicine. i. a preliminary biological screening for molluscicidal activity of certain sudanese plants used in folk-medicine.	a preliminary biological screening for molluscicidal activity of certain sudanese plants used in folk-medicine was carried out. 78 samples belonging to 51 species, 45 genera and 28 families were screened. the aqueous extracts of 18 samples belonging to 8 species, 6 genera and 5 families were found to be active against bulinus truncatus and 7 of these were also found to be active against biomphalaria pfeifferi. successive extraction of the 18 active samples with petroleum ether, ethanol and water ...	1979	529347
studies of the relationships between schistosoma and their intermediate hosts. iv. the genus bulinus and schistosoma bovis from morocco.	schistosoma bovis from morocco was used in infection experiments with several populations of bulinus truncatus. the snails from libya, malawi, morocco and senegal were very compatible with the schistosome since the infection rates were approximately 90%, the mortality was low, and a very high production of cercariae, approximately 1.2 million per 100 exposed snails, was observed. only a very few b. truncatus (2n = 36) from rhodesia became infected. b. permembranaceus and b. forskalii were refrac ...	1979	541499
prevalence of schistosomiasis among fishermen of lake maryut.	a survey was carried out to investigate the presence of bilharziasis among the fishermen of the lake maryut. schistosoma mansoni is more prevalent, than s. haematobium among fishermen of lake maryut. biomphalaria alexandrina, snails were prevalent around the lake specially in places of low salinity, where fresh water discharges exist. bulinus truncatus snails were not found during the time of the present survey and more frequent surveys are needed. there is an inverse relation between the number ...	1978	555758
experimental studies on the suitability of aquatic snails as intermediate hosts for paramphistomum cervi in iraq.	three of the most common species of aquatic snails in iraq were examined for their susceptibility to infection with paramphistomum cervi. bulinus truncatus was the only susceptible species. no development occurred in physa acuta or lymnaea lagotis euphratica. these findings and a previous field observation that infection of b. truncatus with amphistome larvae is not uncommon indicate that b. truncatus is an intermediate host of p. cervi in iraq. young snails of b. truncatus were more susceptible ...	1978	666386
neurosecretion in the basommatophoran snail bulinus truncatus (gastropoda, pulmonata).	the neurosecretory system of the freshwater snail bulinus truncatus was investigated. with the alcian blue-alcian yellow (ab/ay) staining method at least 10 different types of neurosecretory cells (nsc) were distinguished in the ganglia of the central nervous system. the differences in staining properties of the nsc - with ab/ay the cells take on different shades of green and yellow - are borne out at the ultrastructural level: the nsc types contain different types of neurosecretory elementary g ...	1977	837395
the molluscicidal properties of some bayluscide homologues.	the molluscicidal properties of 5-nitro- and 3-nitro2',4'-dichloro salicylanilides and their mixture 5.5 : 1 were investigated against the intermediate hosts of schistosomes bulinus truncatus and biomphalaria alexandrina. unlike bayluscide, the activity of the new mulluscicides is not affected by strong sun radiation or by acidic ph. their activity is resistant to storage, river-bed mud and lower temperature.	1977	881142
studies on schistosomiasis in saudi arabia.	during studies on schistosomiasis in saudi arabia, urine and stool samples from inhabitants of various areas (mostly rural) were examined, and 97 aquatic habitats in 46 localities were searched for snails. the results indicate the occurrence of both urinary and intestinal schistosomiasis in most parts of the country, with a patchy distribution and varying infection rates. the snail intermediate host of schistosoma mansoni was found to be biomphalaria arabica. for s. haematobium three species of ...	1976	943963
first record of bulinus truncatus (audouin) in jordan.		1976	971006
on the larval trematodes recovered from bulinus truncatus in assiut governorate. part ii. leptocercous and amphistome cercariae.		1976	1025234
larval trematode stages in bulinus truncatus and biomphalaria alexandrina snails.		1976	1025238
influence of diet on breeding and infectivity in mass cultivation of bulinus truncatus.	under well defined laboratory conditions as troughs, room temperature, humidity, water, and air supply bulinus truncatus was bred and kept. in a feeding trial high protein diet consisting of powdered mice pellets, commercial tropical fish food and lettuce was compared to poor protein diet of lettuce alone. higher yield of clutches, eggs and cercariae were observed in the rich protein diet group, bulinus and biomphalaria snail seem to be influenced by diet in the same way.	1976	1029649
effect of different doses of x-ray irradiation on bulinus truncatus snails and eggs.		1976	1036429
techniques for estimating densities of bulinus truncatus rohlfsi and its horizontal distribution in volta lake, ghana.	bulinus truncatus rohlfsi is the intermediate host of urinary schistosomiasis, which is highly endemic in the man-made volta lake. in 1971, a who/undp schistosomiasis project was established in the pawmpawm branch and part of the afram branch of volta lake. malacological findings of the preliminary phase indicated that the snails were distributed in the littoral zone of the lake, and that this distribution was correlated with the presence of vegetation, especially ceratophyllum. transmission nea ...	1976	1088354
a large-scale snail control trial with trifenmorph in the gezira irrigation scheme, sudan.	a large-scale field trial was carried out during december 1973 to assess the effect of trifenmorph on bulinus truncatus and biomphalaria pfeifferi in 379 000 feddans ( approximately 159 000 ha) of the gezira irrigation system in the sudan. the commercial formulation used (frescon) is an emulsifiable concentrate containing 16.5% trifenmorph. five dispensers were used to add the commercial product to the water continuously for 7.5 days; 18 121 litres were used to treat 28.4 million m(3) of water. ...	1976	1088406
the life cycle of echinoparyphium ralphaudyi sp. n. (trematoda: echinostomatidae).	the life cycel and morphology of echinoparyphium ralphaudyi sp. n. is described. natural infections were found in bulinus truncatus from egypt, ethiopia, and the yemen arab republic, and later in b. forskalii and b. sericinus from ethiopia. sporocysts develop near the places of miracidial entry into the snail (the head-foot region, mantle edge, pseudobranch, and antennae). rediae occur mainly in the ovotestis and in tissues anterior to the liver. the first cercariae are released 24 days postexpo ...	1975	1117371
carbohydrate metabolism in uninfected and trematode-infected snails biomphalaria alexandrina and bulinus truncatus.		1975	1157458
the suitability of several aquatic snails as intermediate hosts for angiostrongylus cantonensis.	sixteen species of aquatic snails of four families were tested by quantitative technique under standardized conditions for their suitability as intermediate hosts for angiostrongylus cantonensis. these species were the planorbid snails biomphalaria glabrata, biomphalaria alexandrina, planorbis planorbis, planorbis intermixtus, bulinus truncatus, bulinus contortus, bulinus africanus, bulinus tropicus and helisoma sp.; the lymnaeid snails lymnaea natalensis, lymnaea tomentosa, lymnaea stagnalis, a ...	1975	1189583
[remarks on the ecological adaptation of the snail aquatic fauna in saline medium of the dallol ponds. (republique du niger) (author's transl)].	human vesical and intestinal bilharziasis, bovine fasciolosis and paramphistomosis, equine gastrodiscosis and ovine carmyeriosis, are frequent in the dallols'region, (12 degrees - 13 degrees 30 n. lat. ; 3 degrees e. long.), republique du niger, africa. dallols are fossil valleys pouring water from late saharian lakes. they are also tributaries of the niger river. during the dry season, they become dry and many residual ponds of varied dimensions; from tens feet to one or two miles long, are lyi ...	1975	1221913
mollutox and bayer 73 as molluscicides against bulinus truncatus and biomphalaria alexandrina.		1975	1235499
letter: bulinus sp. (2n=36) from salisbury, rhodesia, a close relative of bulinus truncatus (audouin), being a potential intermediate host of schistosoma haematobium in south-east africa.		1976	1265826
[population dynamics and infestation of bulinus truncatus and bulinus forskalii by schistosomal larvae in the sudan-sahelian zone of cameroon].	the evolution of the population densities of bulinus truncatus and bulinus forskalii has been studied during 18 months in a number of sites of the sudan-sahelian zone of cameroon, in relation to certain environmental factors. only the altitude of the water in the sites has an influence on the density of the snails. the populations of b. truncatus present a greater proportion of young molluscs during the entire year, with the exception of the last months of the dry season. the population dynamics ...	1992	1292427
the molluscicidal activity of coumarins from ethulia conyzoides and of dicumarol.	the molluscicidal principles of ethulia conyzoides were identified as ethuliacoumarin a (1) and isoethuliacoumarin a (2). ethuliacoumarin a possessed an lc90 between 19 and 23.5 ppm depending on the age of the snail against biomphalaria glabrata, and between 12 and 15 ppm against bulinus truncatus. in addition, ethuliacoumarin a was found to be cercaricidal at 25 ppm and ovicidal. ethuliacoumarin has the structural requirements considered essential for anticoagulant activity. consequently the an ...	1992	1438593
human helminthosis in a rural community of plateau state, nigeria.	urine and faecal samples were obtained from 1,517 people in fier, a typical rural village in plateau state, nigeria, for a parasitological survey among the population. 643 (42.39%) persons were found to be infected with altogether 9 helminths, namely: ascaris lumbricoides, hookworm, taenia sp., trichuris trichiura, enterobius vermicularis, schistosoma mansoni, s. haematobium, hymenolepis nana and strongyloides stercoralis. age and religion as opposed to sex, type of sewage system, and type of ho ...	1992	1456465
the mouse as a suitable host for an isolate of schistosoma haematobium from niger.	the host-parasite relationships of a schistosoma haematobium isolate, originating from niger, and the white mouse are described. swiss of1 albino mice were exposed individually to 200 cercariae and worms were recovered 9, 12, 16 and 20 weeks post infection. the mean worm returns ranged between 10.54 and 13.05% and did not alter significantly between 9 and 20 weeks post infection. the sex ratio of worms was always in favour of males; from 7.09:1 at 9 weeks after infection it decreased regularly t ...	1992	1469258
succinate-dcpip and nadh-fumarate oxidoreductases in fresh water snails susceptible and non susceptible to schistosoma infection.	the activities of succinate-dcpip oxidoreductase (so) and nadh-fumarate oxidoreductase (fr) were determined in tissue homogenate of biomphalaria alexandrina and bulinus truncatus, the snail vectors of schistosomiasia. a parallel study was done on lymnea truncatula snails which are not susceptible to schistosoma infection. the michaelis constant (km) and maximum velocities (vmax) for fumarate reduction and succinate oxidation by the tissue homogenates from the three species were determined. the r ...	1992	1571942
seasonal patterns in the transmission of schistosoma haematobium in attaouia, morocco.	in the attaouia area, the density of bulinus truncatus (audouin, 1827), was monitored monthly for a period of one year in correlation with weather variations. snails were active throughout the year and particularly abundant at the end of spring and summer. two snail generations were found to overlap. the infection rate of b. truncatus reached a maximum of 3.5% in the summer when human water contact was frequent. a selective survey conducted in the village of lamyayha showed that the prevalence o ...	1992	1640092
the occurrence of schistosomin, an antagonist of female gonadotropic hormones, is a general phenomenon in haemolymph of schistosome-infected freshwater snails.	in haemolymph of lymnaea stagnalis, parasitized with the digenetic trematode parasite trichobilharzia ocellata, a neuropeptide (schistosomin) occurs which antagonizes female gonadotropic hormones, e.g. calfluxin (cafl). by means of an ultracytochemical hormone-assay, the cafl assay, it was demonstrated that the occurrence of schistosomin is a general phenomenon in schistosome-infected freshwater snails. haemolymph of the schistosomiasis-transmitting snail species biomphalaria glabrata and b. pfe ...	1991	1780174
selection of susceptible lines of biomphalaria alexandrina and bulinus truncatus snails to s.mansoni and s.haematobium infection.	selection of progenies from infected b.alexandrina and b.truncatus snails resulted in higher infection rates. this observation was consistent when the source of micardia were from either infected human or hamsters. infection rate of b.alexandrina increased up to 88.2% while b.truncatus did not. compatibility between the parasites and their intermediate hosts were also studied.	1991	1791409
effect of schistosome infection on protein, glycogen and glucose contents in biomphalaria arabica and bulinus truncatus.	b. arabica and b. truncatus the snail intermediate hosts of intestinal and urinary schistosomiasis in yemen arab republic, were bred in the laboratory and infected with s. mansoni and s. haematobium respectively. schistosome infection caused a marked decrease in the glycogen and protein contents in the tissue of b. arabica and b. truncatus. the glucose content in the hemolymph of both infected snails was lower than that in the normal snails.	1991	2033308
cercarial shedding patterns of schistosoma bovis and s. haematobium from single and mixed infections of bulinus truncatus.	the cercarial shedding of schistosoma bovis and s. haematobium were studied in single and mixed infections in the snail host bulinus truncatus. the two species displayed a distinctive diurnal cercarial emergence with an earlier shedding pattern for s. bovis than s. haematobium (the average emergence peaks were respectively at 0800 h and 1200 h). in mixed infections, each species kept its own cercarial shedding rhythm with no marked alterations. the cercarial emergence pattern is proposed as a ne ...	1991	2050991
[urinary schistosomiasis in the saharan mountain plateau of air (republic of niger)].	in two villages of the aïr (republic of niger) the authors have found a schistosoma haematobium overall prevalence of 24.1% at timia and 43.5% at el meki. at el meki, the distribution of prevalences by age group accords to that which is usually found. the maximum is found in the 5-14 years age group and highest in men than in women. at timia, the prevalence among young pupils is low, this seems to be due to the application of sanitary education measures. at el meki, bulinus truncatus rohlfsi, pr ...	1990	2119898
interference of echinoparyphium elegans with the host-parasite system bulinus truncatus-schistosoma bovis in natural conditions.	histological observations of bulinus truncatus naturally infected by both schistosoma bovis and echinoparyphium elegans in sardinia (italy) have shown that e. elegans is pathogenic to the mollusc and dominant to the schistosome. the larval stages, rediae and metacercariae, acted as compressors. rediae, mainly the young and very motile ones, also behaved as predators. the organs of the mollusc were variably affected; the ovotestis totally disappeared. the larval development of the schistosome was ...	1990	2260898
the effect of schistosoma haematobium infection on the growth and fecundity of three sympatric species of bulinid snails.	three species of bulinid snails were monitored to determine the effect of infection with 2 sympatric strains of schistosoma haematobium on longevity, growth, and reproductive output, from the onset of cercarial production until death. bulinus senegalensis was least affected by infection, with total fecundity reduced by less than 34%. infected bulinus truncatus showed an acceleration in growth accompanied by a 63% reduction in fecundity, although the majority of snails continued to oviposit at a ...	1990	2380865
schistosomiasis control in saudi arabia with special reference to the period 1983-1988.	schistosomiasis control operations carried out between 1983 and 1988 are described, together with information of the impact of schistosomiasis. the prevalence of schistosomiasis has declined from 9.5% in 1983 to 1.8% in 1988 (p less than 0.05). bulinus truncatus, b. beccarii, and b. reticulatus wrighti are the intermediate hosts of s. haematobium in saudi arabia and are distributed unevenly in the different regions. biomphalaria arabica is the intermediate host of s. mansoni and is found whereve ...	1990	2382008
genetic variability in the compatibility between schistosoma haematobium and its potential vectors in niger. epidemiological implications.	a populational study of the compatibility between schistosoma haematobium and its potential vectors has been carried out in the niger, confronting samples of s. haematobium populations from three epidemiologic foci with bulinus populations originating from the same focus (sympatric infection) and with bulinus populations from other foci (allopatric infections). the three transmission foci selected were irrigation canals in ricefields along the niger river where one finds: bulinus truncatus rohlf ...	1990	2382092
1983 nile delta schistosomiasis survey: 48 years after scott.	to determine whether the sharply declining schistosoma haematobium infection rates in parts of the nile delta could be generalized to the entire region, and to update the status of s. mansoni infection rates, a large scale survey was undertaken in 1983 in 70 of the 71 districts of the nile delta. in a house-to-house survey, greater than 91% of the sample population of 16,675 participated by providing stool and/or urine specimens which were examined qualitatively by kato thick smear and sedimenta ...	1989	2504069
endemicity, focality and seasonality of transmission of human schistosomiasis in amagunze village, eastern nigeria.	the pattern of transmission of human schistosomiasis was studied in amagunze village, eastern nigeria, during 1986-1987. the prevalence of schistosoma haematobium in 119 schoolboys aged 5-12 years was 79%. the geometric mean of intensity of infection was 49 eggs/10 ml urine and the frequency of visible haematuria was 25.2%. no s. mansoni infections were demonstrated. a marked seasonality in population density of bulinus truncatus, b. forskalii and biomphalaria pfeifferi was demonstrated with red ...	1989	2507628
ultrastructural changes in the male germ cells of bulinus truncatus during spermatogenesis.	the structure of the spermatogonia, spermatocytes, spermatids and sertoli cells of the hermaphroditic snail bulinus truncatus was studied by electron microscopy. the spermatogonia are small, with relatively large nuclei. the acrosome develops from a small proacrosomal granule which is probably derived from the golgi apparatus in the spermatocyte stage. condensation and elongation of the nuclei were found in the spermatids. the shape and components of the sertoli cells did not change during the s ...	1989	2606387
dynamics of the intramolluscan larval development of schistosoma haematobium: replication of daughter sporocysts and cercarial production.	during the intramolluscan larval development of schistosoma haematobium (algerian strain) in bulinus truncatus, two replication processes of daughter sporocysts occur. replication by direct sporocystogenesis appears more important than sporocystogenesis post cercariogenesis. these mechanisms assure a periodic renewal of the sporocyst stock in the snail host and seem to be synchronized with the development of cercarial generations. the succession of several generations of cercariae is responsible ...	1989	2723382
developmental and comparative aspects of nonsynaptic release by the egg-laying controlling caudodorsal cells of basommatophoran snails.	in an immunoelectron microscope study the postembryonic development of the cerebral caudodorsal cells (cdc) in the freshwater snail lymnaea stagnalis was studied as well as the development of similar neurons in other basommatophoran families. the cdc of adult l. stagnalis control egg-laying and associated behaviors by releasing various peptides, including the ovulation hormone cdch. the cdc release peptides from neurohemal axon terminals and from nonsynaptic release sites of axon collaterals. du ...	1989	2767405
histological and histochemical studies on the digestive gland of bulinus truncatus infected with schistosoma haematobium.	the structure of the uninfected and infected digestive gland of the fresh-water snail, bulinus truncatus, was studied histologically and histochemically. the digestive gland consists of two types of cells: digestive and secretory cells clearly differentiated from each other. the pathological effects of infection of the snail with cercariae of schistosoma haematobium have resulted in considerable structural and histochemical alterations in the digestive gland. generally, the main effects were ref ...	1989	2768865
the effects of starvation and refeeding on egg laying and the synthetic activity of the albumen gland in bulinus truncatus, a snail vector of urinary schistosomiasis.	1. the effects of starvation (for 1, 2, 3, 6, 9 and 12 days, respectively) and refeeding (12 days starvation and 1, 2 and 3 days refeeding, respectively) on egg laying and albumen gland activity in the freshwater snail, bulinus truncatus were studied. 2. the egg laying of starving snails rapidly decreased and ceased by day 6 of starvation. egg laying was restored 24 hr after refeeding. the recorded decrease in albumen gland wet weight was proportional to the starvation periods. the dna contents ...	1987	2887345
[trematodes of bulinus truncatus (mollusca, planorbidae) in algeria].		1988	3268052
effect of canna indica l. leaves on the hermaphrodite gland of the snail bulinus truncatus (audouin).		1988	3391452
the cercarial output from three nigerian bulinids infected with two strains of schistosoma haematobium.	the daily cercarial output of two nigerian strains of schistosoma haematobium in sympatric bulinus truncatus, b. globosus and b. senegalensis was measured at weekly intervals from the start of emission to the snails' death. in all cases cercariae were released throughout the life of the host, with no cases of "self cure". patterns of output through the course of infections in b. truncatus and b. senegalensis were similar to those reported for s. haematobium by other workers, with daily productio ...	1988	3397515
schistosoma bovis: variability of cercarial production as related to the snail hosts: bulinus truncatus, b. wright and planorbarius metidjensis.		1987	3440697
[population dynamics of bulinus truncatus in a focus of bilharziasis in khemis-el-khechna (northern algeria)].	a demographic and epidemiological study of bulinus truncatus was carried out in hamiz river, transmission site of schistosomiasis in the khemis-el-khechna focus. the results shows direct influence of hydrographic factor on the populations dynamic which is characterized by irregular variations.	1987	3450442
[comparative analysis of the rhythm of cercariae emergence in three strains of schistosoma bovis (trematoda: schistosomatidae)].	a comparative experimental study of the rhythmic shedding of three geographic strains of schistosoma bovis cercariae (sardinian, sudanese and spanish) by bulinus truncatus showed a significant difference in the emergence patterns. the results support the existence of a genetic variability of the emergence rhythms. the origin of the variability is discussed and could be found in the pastoral practice and the ecological characteristics of the different transmission foci.	1987	3508513
genetic variability of schistosoma bovis cercarial production according to miracidial dose.	cercarial production related to miracidial dose variation with schistosoma bovis strains from sudan and spain in bulinus truncatus from tunisia was studied. results showed that an increase in the miracidial dose proposed to the host-mollusc (1 and 5 miracidia) gave rise to a decrease in cercarial productivity of sudanese s. bovis and to an increase for spanish s. bovis. it is concluded that this response difference to the miracidial dose variation depends on genetic characters peculiar to the pa ...	1987	3571926
morphology of neurosecretory cells in basommatophoran snails homologous with egg-laying and growth hormone-producing cells of lymnaea stagnalis.	in a light and electron microscope study, neurosecretory cells morphologically homologous with the egg-laying hormone-producing caudodorsal cells (cdc) and growth hormone-producing dorsal cells (dc, light green cells) of the freshwater basommatophoran snail lymnaea stagnalis have been found in five genera (seven species) of basommatophora, viz. in lymnaea palustris and lymnaea ovata, in planorbis planorbis and planorbis vortex, in planorbarius corneus, in bulinus truncatus, and in biomphalaria g ...	1987	3623071
laboratory selection for increased tolerance to niclosamide in bulinus truncatus (gastropoda: planorbidae) from iran.	survivors of bulinus truncatus from one exposure to niclosamide (bayluscide) were used to establish the next generation in a five generation long laboratory selection for increased tolerance to niclosamide. in a comparison of the tolerance to the molluscicide between two original and two selected strains about 150 snails of each strain, divided into four size-groups, were exposed to aliquots of the same niclosamide solution on the same day and during the same time of the day. it was shown that f ...	1987	3689021
laboratory evaluation of gambusia affinis fish as predators of the schistosome-bearing snails bulinus truncatus.	in this laboratory-based study involving numerous experiments, it was demonstrated that the mosquito fish gambusia affinis preys effectively upon the schistosome-bearing snail bulinus truncatus, even in the presence of an alternative source of food. egg masses and juvenile snails less than or equal to 2 mm in size are preferred. individual eggs are nibbled, and the tiny snails with fragile shells are swallowed and digested. in the absence of other foods, the fish consume the flesh of snails 3 to ...	2012	3755766
schistosoma bovis: patterns of cercarial emergence from snails of the genera bulinus and planorbarius.	a comparative experimental study of the rhythmic shedding of two geographic strains of schistosoma bovis cercariae by bulinus truncatus and planorbarius metidjensis did not show any differences in emergence patterns. in our opinion, the results support the hypothesis that cercarial emission rhythms are determined primarily by the parasite in these snail/parasite associations.	1986	3780932
transmission of schistosoma haematobium in north gezira, sudan.	during this 14-month study, 128 765 bulinus truncatus snails were collected from canals located near four villages in the northern part of the gezira irrigated area, and were examined for patent trematode infections, by exposure to light. in all, 903 shedded cercariae, of which 424 were identified as s. haematobium, and one village, bashagra, was the source of 80% of these s. haematobium infections. the highest density of snails occurred from march to may and the peak of snail infections occurre ...	1985	4032531
snails and aquatic vegetation in gezira irrigation canals.	all 38 minor canals in a limited area of the gezira irrigated area were surveyed four times over a 2-year period to determine the aquatic and semi-aquatic vegetation types found and their distribution. a more detailed 2-year study of the correlation between snail density and aquatic vegetation was carried out in 18 of these canals. a total of 22 different species of weed were recorded, with floating and submerged weeds being more widespread and dense in the clear, slow-moving water at the end of ...	1985	4032532
molluscicidal properties of acacia nilotica subspecies tomentosa and astringens i.	the acetone, alcohol and aqueous extracts of the fruits and stem bark of acacia nilotica subspp. tomentosa, astringens and nilotica showed molluscicidal activity against the two snail species which transmit schistosomiasis in the sudan. being effective against bulinus truncatus and biomphalaria pfeifferi, extracts of the acacia nilotica subspecies may be promising vegetable molluscicides.	1985	4068076
molluscicidal properties of acacia nilotica subspecies tomentosa and astringens ii.	a screening programme of plants rich in plant phenolic tannins for molluscicidal activity against the snail species bulinus truncatus and biomphalaria pfeifferi is now under way. the spray-dried powders of the pods and stem bark of acacia nilotica subspp. nilotica, tomentosa and astringens prove to be promising vegetable molluscicides.	1985	4068077
antagonism of echinoparyphium recurvatum against schistosoma haematobium in the snail bulinus truncatus.		1974	4412038
laboratory studies on the direct effect of temperature on bulinus truncatus and biomphalaria alexandrina, the snail intermediate hosts of schistosomes in egypt.		1974	4414053
some helminths of bulinus truncatus and biomphalaria alexandrina from the irrigation system near cairo.		1974	4415826
effect of sub-lethel doses of molluscicides on the susceptibility of bulinus truncatus snails to infection with schistosoma haematobium.		1974	4418538
letter: bulinus truncatus as a potential intermediate host for schistosoma haematobium on the kano plain, kenya.		1974	4419850
effect of sub-lethal doses of molluscicides on the susceptibility of bulinus truncatus snails to infection with schistosoma haematobium.		1974	4469237
control of snail hosts of bilharziasis in egypt. i. effect of triphenyltin hydroxide (du-ter) on aerobic oxidation of the snails biomphalaria alexandrina and bulinus truncatus.		1974	4471061
seasonal abundance of trematode cercariae in bulinus truncatus in a small focus of schistosomiasis in the nile delta.	bulinus truncatus was most numerous from june to august, and echinostome cercariae, present in 19.3% of snails, were the most prevalent of the 4 types of trematode cercariae found. the echinostomes occurred throughout the year, other cercariae only in certain months. double infections were uncommon. the findings suggest that echinostome cercariae exercise some biological control of schistosoma haematobium in the area studied.	1972	4539823
[mixed infestation of bulinus truncatus (audouin, 1827) by larval forms of schistosoma haematobium (bilharz, 1852) and an echinostomatidae].		1972	4650809
[intragonadal embryonic developments observed after various interventions on the genital tract in some pulmonate gastropods and chiefly in bulinus truncatus (audouin)].		2007	5152964
host-parasite relationship of bulinus truncatus and schistosoma haematobium in iran. 1. effect of the age of b. truncatus on the development of s. haematobium.	this paper is the first of a series of four on various aspects of the interaction between bulinus truncatus and the bilharziasis parasite schistosoma haematobium. it describes laboratory studies conducted to determine the effect of the age of b. truncatus on the development of s. haematobium. the results indicated (1) that the young snails could be infected even if they were one day old; (2) that the infection rates were higher in the snails of two to five weeks of age than in those of one week; ...	1966	5295557
host-parasite relationship of bulinus truncatus and schistosoma haematobium in iran. 2. effect of exposure dosage of miracidia on the biology of the snail host and the development of the parasites.	laboratory experiments were carried out to study the development of bulinus truncatus and the larval stages of schistosoma haematobium after the snails had been exposed to various numbers of miracidia. the results showed: (1) that in the cercarial-incubation period the growth and survival rate of snails was not influenced by the development of the larval stages of s. haematobium, but that in the cercaria-shedding period the life-span of the infected snails was shorter than that of the non-infect ...	1966	5295558
host-parasite relationship of bulinus truncatus and schistosoma haematobium in iran. 3. effect of water temperature on the ability of miracidia to infect snails.	laboratory studies were made in iran to test the effect of water temperature on the ability of the miracidia of s. haematobium to penetrate b. truncatus. snails three to four weeks old were exposed to two miracidia each for two hours at nine water temperatures ranging from 10 degrees c to 38 degrees c. after exposure, all the snails were kept in aquaria at room temperature. the cercaria-positive rates of these nine groups of snails showed that the optimum exposure temperature was in the range 20 ...	1966	5295559
host-parasite relationship of bulinus truncatus and schistosoma haematobium in iran. 4. effect of month of infection on cercarial-incubation periods of s. haematobium and s. bovis.	studies were conducted each month for one year to determine the cercarial-incubation periods of schistosoma haematobium and schistosoma bovis in bulinus truncatus for different months of infection. the snails were kept in outdoor aquaria in order to simulate the natural temperature conditions in the endemic bilharziasis areas of iran.the results showed that the cercarial-incubation periods of these two schistosome species varied with the environmental water temperature. snails exposed in august ...	1966	5295560
the ecology of bulinus truncatus and biomphalaria alexandrina and its implications for the control of bilharziasis in the egypt-49 project area.	the respective vectors of the two forms of bilharziasis in egypt do not have the same ecological distribution. bulinus truncatus is most abundant in large canals, and decreases in density as the water approaches and flows into drains. biomphalaria alexandrina is most abundant in drains, and decreases in density upstream from these habitats. both species are most abundant in the presence of aquatic vegetation, but they differ in their respective associations with the water hyacinth, eichhornia cr ...	1966	5297630
field tests on two new molluscicides (molucid and wl 8008) in the egypt-49 project area.	in a continuing search for more effective molluscicides, tests were carried out in the egypt-49 area on molucid and wl 8008. molucid, a 35% w/v solution of isobutyltriphenyl-methylamine (ici 24223), was applied at 2 ppm for 6 hours; after the treatment, no live bulinus truncatus, biomphalaria alexandrina or lymnaea caillaudi were observed for at least three months and snail densities remained low for at least seven months. egg-masses were not affected by the treatment, however. wl 8008, n-trityl ...	1966	5298040
distribution and ecology of bulinus truncatus in khuzestan, iran.	the results of a 5-year study on the distribution and ecology of bulinus truncatus in khuzestan, south-western iran, are described. live snails were found in 4 foci, namely, the main focus, the upper karun river, the lower karkheh river, and the bala rud watershed; in addition, dead snails were found in 3 other foci. the patchy distribution of snails was related to the presence of surface waters and to their chemical composition.monthly observations on the population dynamics of the snails and o ...	1968	5304436
effect of molluscicide application against bulinus truncatus in iraq on the structure of eggs produced by treated snails.		1969	5388192
copper sulphate as a molluscicide against bulinus truncatus eggs in iraq.		1969	5407902
observations on the infection of bulinid snails with schistosoma mattheei. i. the susceptibility of bulinus africanus and bulinus truncatus.		1968	5714964
monthly prevalence rates of natural infection with schistosoma haematobium cercariae in bulinus truncatus in central iraq.		1965	5889011
periodicity and longevity of schistosoma haematobium cercariae liberated from bulinus truncatus in central iraq.		1965	5889014
factors inherent in the egg-masses of bulinus truncatus (snail intermediate host of urinary bilharziasis in iraq) affecting the efficacy of molluscicides.		1964	5890098
effect of low concentrations of sodium pentachlorophenate on the fecundity and egg viability of bulinus truncatus from central iraq.		1965	5896523
immunity to schistosoma haematobium in bulinus truncatus.		1966	5954292
studies on the biology and ecology of bulinus truncatus (intermediate host of urinary bilharziasis in central iraq with suggestions for control).		1966	5985995
[snails and bilharziasis in corsica. distribution, frequency and biology of "bulinus truncatus"].		2003	6008534
the ability of bulinus truncatus, biomphalaria alexandrina and lymnaea gedrosiana to survive out of water in the laboratory.		1967	6051532
the location of bulinus truncatus in dry habitats in iran.		1967	6063490
the survival time and fecundity of bulinus truncatus after desiccation in mud.		1967	6063491
the survival of bulinus truncatus buried in mud under experimental outdoor conditions.		1967	6069306
[development of the sporocysts of schistosoma bovis after microsurgical transplantation in bulinus truncatus].	microsurgical transplantations of schistosoma bovis daughter sporocysts to uninfected bulinus truncatus leads to a dedifferenciation of transplanted sporocysts producing an additional generation of daughter sporocysts. these ones settle into the whole digestive gland and produce infective cercariae. for all the parasitosis, a part of the daughter sporocysts born from the transplanted ones, remains in the head-foot region and are in their turn responsible for an active sporocystogeny. data demons ...	1984	6508141
studies on the effects of population density on the growth and survivorship of bulinus truncatus from assiut.		1983	6631096
the effects of population density on the reproductive capacity of bulinus truncatus from assiut, egypt.		1983	6663097
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
the prepatent period and cercarial production of schistosoma haematobium in bulinus truncatus (egyptian field strains) at different constant temperatures.	the developmental time of schistosoma haematobium in bulinus truncatus snails (field strains) was determined in the laboratory at different constant temperatures between 18 and 32 degrees c. the basic relationship between the length of the minimum prepatent period (y, in days) and the temperature (x, in degree c) is given by the hyperbolic formula y = 295/(x-15.3), 15.3 being the theoretical "developmental null point" and 295 the constant time-temperature product. the shortest prepatency was 17- ...	1984	6695537
the effect of temperature on inter-relationship between schistosoma haematobium and bulinus truncatus in egypt.		1984	6736691