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Articles 2011 - 2038 of 2038

Full-Text Articles in Medicine and Health Sciences

Repellence Of The Tick Rhipicephalus Appendiculatus By The Grass Melinis Minutiflora, Esther N. Mwangi, S. Essuman, G. P. Kaaya, E. Nyandat, D. Munyinyi, M. G. Kimondo Dec 1995

Repellence Of The Tick Rhipicephalus Appendiculatus By The Grass Melinis Minutiflora, Esther N. Mwangi, S. Essuman, G. P. Kaaya, E. Nyandat, D. Munyinyi, M. G. Kimondo

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In a study to develop anti-tick pastures, the climbing behaviour of Rhipicephalus appendiculatus on Melinis minutiflora (molasses grass) was investigated. Experiments were done with cut green stems of grass, grass dried in the shade, grass dried in sunshine, grass washed in solvent and grass growing in a study plot. In all cases a common pasture grass, Pennisetum clandestinum (Kikuyu grass), was used as control. All instars of the tick avoided climbing on the green M. minutiflora whereas most larvae, nymphs and adults climbed on the control green P. clandestinum grass. More ticks climbed on the stems dried in the sunshine …

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Repellent And Acaricidal Properties Of Ocimum Suave Against Rhipicephalus Appendiculatus Ticks, Esther N. Mwangi, Ahmed Hassanali, Suliman Essuman, Edward Myandat, Lambert Moreka, Mark Kimondo Jan 1995

Repellent And Acaricidal Properties Of Ocimum Suave Against Rhipicephalus Appendiculatus Ticks, Esther N. Mwangi, Ahmed Hassanali, Suliman Essuman, Edward Myandat, Lambert Moreka, Mark Kimondo

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An oil extracted from the leaves of a tropical shrub Ocimum suave was found to repel as well as kill all stages of the tick Rhipicephalus appendiculatus. In an in vitro bioassay for the larvae, the LC50 of the oil in liquid paraffin was 0.024%. A 10% solution was found to kill all immatures and more than 70% of adults feeding on rabbits. Rabbits were protected for 5 days against attaching larvae using a 10% solution. Preliminary experiments undertaken with cattle kept in the field suggest that the oil may have potential in tick control, and a role in integrated …

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Optimization Of The In Vitro Feeding Of Rhipicephalus Appendiculatus Nymphae For The Transmission Of Theileria Parva, S. M. Waladde, S. N. Mwaura, G. N. Njihia, F. N. Mwakima Jan 1995

Optimization Of The In Vitro Feeding Of Rhipicephalus Appendiculatus Nymphae For The Transmission Of Theileria Parva, S. M. Waladde, S. N. Mwaura, G. N. Njihia, F. N. Mwakima

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An apparatus for artificial feeding of Rhipicephalus appendiculatus nymphae was modified to improve feeding performance. Heparinized blood was supplied above a treated artificial membrane while the ticks attached below on its undersurface. The feeding apparatus was incubated at 37 °C in an atmosphere of 3% CO2 concentration and a relative humidity of 75–80 °0. Under these conditions, 91 °0 of the engorged nymphae attained a mean weight of 6–11 mg, and an average of 93 °0 of those nymphae moulted into adults. When this system was used to feed nymphal ticks on blood infected with Theileria parva piroplasms, the mean …

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Dynamics Of Host Blood Effects In Glossina Morsitans Sspp. Infected With Trypanosoma Congolense And T. Brucei, Reardon O. Olubayo, Steve Mihok, Eli Munyoki, Leonard H. Otieno Mar 1994

Dynamics Of Host Blood Effects In Glossina Morsitans Sspp. Infected With Trypanosoma Congolense And T. Brucei, Reardon O. Olubayo, Steve Mihok, Eli Munyoki, Leonard H. Otieno

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The pattern of infection in Glossina morsitans morsitans and G. m. centralis membrane-fed on eland, buffalo or goat blood mixed with Trypanosoma congolense or T. brucei was studied from day 1 to day 10. Tsetse were initially permissive vectors, with most flies harbouring infections of 104-105 parasites on day 3. However, after a second blood meal on day 3, flies cleared many infections with G. m. morsitans clearing more infections than G. m. centralis. Infective feeds of goat blood consistently increased final infection rates by limiting the number of infections lost between days 3 and 6. In further experiments with …

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Detection Of Trypanosome Infections In The Saliva Of Tsetse Flies And Buffy-Coat Samples From Antigenaemic But Aparasitaemic Cattle, P. A.O. Majiwa, R. Thatthi, S. K. Moloo, J. H.P. Nyeko Jan 1994

Detection Of Trypanosome Infections In The Saliva Of Tsetse Flies And Buffy-Coat Samples From Antigenaemic But Aparasitaemic Cattle, P. A.O. Majiwa, R. Thatthi, S. K. Moloo, J. H.P. Nyeko

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Relatively simple protocols employing non-radioactive DNA probes have been used for the detection of African trypano-somes in the blood of mammalian hosts and the saliva of live tsetse flies. In combination with the polymerase chain reaction (PCR), the protocols revealed trypanosomes in buffy-coat samples from antigenaemic but aparasitaemic cattle and in the saliva of live, infected tsetse flies. Furthermore, the protocols were used to demonstrate concurrent natural infections of single tsetse flies with different species of African trypanosomes. © 1994, Cambridge University Press. All rights reserved.

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Isolation Of Trypanosoma Spp. From Wild Tsetse Flies Through Procyclic Expansion In Glossina Morsitans Centralis, Steve Mihok, Eli N. Munyoki, Freddie Masaninga, Paul N. Ndegwa, Reardon O. Olubayo Jan 1994

Isolation Of Trypanosoma Spp. From Wild Tsetse Flies Through Procyclic Expansion In Glossina Morsitans Centralis, Steve Mihok, Eli N. Munyoki, Freddie Masaninga, Paul N. Ndegwa, Reardon O. Olubayo

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Procyclic trypanosomes from wild tsetse flies were membrane-fed to Glossina morsitans centralis in order to develop an optimal technique for propagating field isolates. A 70% success rate was achieved in isolating Trypanosoma simiae and a variety of genotypes of T. congolense originating from G. pallidipes, G. brevipalpis and G. swynnertoni. Parasites matured into forms infective for mammals, and could be maintained by passage of gut forms to new groups of flies. In experiments with laboratory stocks, we also passaged immature gut infections of T. congolense and T. brucei from various tsetse species to G. m. centralis. The optimal technique was …

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Trypanosoma Simiae In The White Rhinoceros (Ceratotherium Simum) And The Dromedary Camel (Camelus Dromedarius), Steve Mihok, Erich Zweygarth, Eli N. Munyoki, John Wambua, Richard Kock Jan 1994

Trypanosoma Simiae In The White Rhinoceros (Ceratotherium Simum) And The Dromedary Camel (Camelus Dromedarius), Steve Mihok, Erich Zweygarth, Eli N. Munyoki, John Wambua, Richard Kock

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Trypanosoma simiae was identified as the cause of a disease outbreak in dromedary camels (Camelus dromedarius) introduced to Tsavo East National Park, confirming the susceptibility of camels to this pathogen. T. simiae was also isolated from a new host, the white rhinoceros (Ceratotherium simum) through xenodiagnosis with a susceptible tsetse species (Glossina morsitans centralis). A white rhinoceros showed some evidence of anaemia and lymphopaenia when harbouring T. simiae, but did not suffer any long-term health effects. © 1994.

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Women's Basketball: Unm Lobos Vs. Loyola Marymount Lions, December 22, 1993, University Of New Mexico Dec 1993

Women's Basketball: Unm Lobos Vs. Loyola Marymount Lions, December 22, 1993, University Of New Mexico

Sports History Video Collection

Video of Women's Basketball: UNM Lobos vs. Loyola Marymount Lions, December 22, 1993

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Trypanosoma (Nannomonas) Congolense: Molecular Characterization Of A New Genotype From Tsavo, Kenya, P. A.O. Majiwa, M. Maina, J. N. Waitumbi, S. Mihok, E. Zweygarth Jan 1993

Trypanosoma (Nannomonas) Congolense: Molecular Characterization Of A New Genotype From Tsavo, Kenya, P. A.O. Majiwa, M. Maina, J. N. Waitumbi, S. Mihok, E. Zweygarth

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Trypanosoma (Nannomonas) congolense comprises morphologically identical but genetically heterogeneous parasites infective to livestock and other mammalian hosts; three different genotypes of this parasite have been described previously. Restriction enzyme fragment length polymorphisms (RFLPs) in both kinetoplast DNA minicircle and nuclear DNA sequences, and randomly amplified polymorphic deoxyribonucleic acid (RAPD) patterns have been used here to demonstrate the existence of another type of T. (N.) congolense that is genotypically distinct from those that have so far been characterized at the molecular level. A highly repetitive, tandemly arranged DNA sequence and oligonucleotide primers, for use in polymerase chain reaction (PCR) amplification are …

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Experimental Immunity Against Trypanosomiasis In Rabbits, Curtis Powell Jan 1993

Experimental Immunity Against Trypanosomiasis In Rabbits, Curtis Powell

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Rabbits were immunized with specially prepared subcellular fractions of a cloned Trypanosoma brucei brucei stock 427. One fraction was found to be highly immunoprophylactic in rabbits exposed to the vector fly genus Glossina m. morsitans (tsetse flies) infected with EATRO Trypanosoma brucei brucei 1969. The most immunoprotective fraction IPFA from T. b. brucei 427 gave 75% protection to animals challenged by EATRO T. b. brucei 1969. IPFA also showed the highest IgG antibody titre against the heterologous and homologous strains. In in vitro studies, the sera from these immunized rabbits killed different strains of parasites, T. b. brucei strains 1969 …

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The Influence Of Host Blood On Infection Rates In Glossina Morsitans Sspp. Infected With Trypanosoma Congolense, T. Brucei And T. Simiae, S. Mihok, R. O. Olubayo, N. Darji, E. Zweygarth Jan 1993

The Influence Of Host Blood On Infection Rates In Glossina Morsitans Sspp. Infected With Trypanosoma Congolense, T. Brucei And T. Simiae, S. Mihok, R. O. Olubayo, N. Darji, E. Zweygarth

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Trypanosoma congolense, T. brucei and T. simiae isolated from wild-caught Glossina pallidipes were fed to laboratory-reared G. morsitans centralis and G. m. morsitans to determine the effect of host blood at the time of the infective feed on infection rates. Bloodstream forms of trypanosomes were membrane-fed to flies either neat, or mixed with blood from cows, goats, pigs, buffalo, eland, waterbuck and oryx. The use of different bloods for the infective feed resulted in differences in infection rates that were repeatable for both tsetse subspecies and most parasite stocks. Goat, and to a lesser extent, pig blood facilitated infection, producing …

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The Role Of Host Management In Tick Population Changes On Rusinga Island, Kenya, D. K. Punyua, S. M. Hassan Apr 1992

The Role Of Host Management In Tick Population Changes On Rusinga Island, Kenya, D. K. Punyua, S. M. Hassan

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Contrary to patterns described elsewhere, tick numbers on Rusinga Island cattle drop markedly after the onset of the rainy season. One possible explanation is that this is related to seasonal differences in host behaviour since cattle grazing on the island are restricted during the crop-growing season (the rainy season) and free grazing afterwards. In a field experiment, cattle were divided into two groups, free grazing and restricted, for 2 months each during the rainy season and during the dry season, and the number of ticks infesting each group was compared. In both seasons, the free-grazing group carried more ticks than …

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Inhibitory Effect Of Trypanosoma Brucei Brucei On Glossina Morsitans Midgut Trypsin In Vitro, M. O. Imbuga, E. O. Osir, V. L. Labongo Apr 1992

Inhibitory Effect Of Trypanosoma Brucei Brucei On Glossina Morsitans Midgut Trypsin In Vitro, M. O. Imbuga, E. O. Osir, V. L. Labongo

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The ability of Trypanosoma brucei brucei to inhibit trypsin or trypsin-like enzymes in crude midgut homogenates of Glossina morsitans morsitans was studied in vitro. The isolated parasites caused a concentration-dependent decrease in midgut trypsin activity. Furthermore, trypanosomes lysed by repeated freeze-thawing had a similar effect on trypsin activity. In both cases, the inhibition by either intact or lysed parasites was partial as revealed by Dixon plots. Similarly, trypanosome membrane proteins stoichiometrically inhibited trypsin activity, suggesting that the enzyme interacts specifically with a moiety on the parasite surface. The Km and Ki values obtained in this case were 35 μm and …

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Trypanosome Infection Rates In Tsetse Flies (Diptera: Glossinidae) And Cattle During Tsetse Control Operations In The Kagera River Region Of Rwanda, Steve Mihok, Leonard H. Otieno, Christopher S. Tarimo Jan 1992

Trypanosome Infection Rates In Tsetse Flies (Diptera: Glossinidae) And Cattle During Tsetse Control Operations In The Kagera River Region Of Rwanda, Steve Mihok, Leonard H. Otieno, Christopher S. Tarimo

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Trypanosome infections were monitored in three species of tsetse fly (Glossina pallidipes Austen, G. morsitans centralis Machado, and G. brevipalpis News-tead) at four locations in the Kagera River region of Rwanda from May 1989 to September 1990. Two of the four areas (Mpanga Ranch and Bukora Ranch) were subjected to tsetse fly suppression operations with odour-baited traps. Proboscis infections of the Trypanosoma congolense and T. vivax types accounted for roughly equal numbers of the 207 mature infections detected (3.8%). Variation in infection rates was area-specific rather than tsetse species-specific. Order of magnitude differences in tsetse fly densities among areas were …

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Recombinant Kinetoplast Dna (Kdna) Probe For Identifying Leishmania Tropica, N. N. Massamba, M. J. Mutinga Jan 1992

Recombinant Kinetoplast Dna (Kdna) Probe For Identifying Leishmania Tropica, N. N. Massamba, M. J. Mutinga

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The paper reports on the construction of a kDNA library with DNA isolated from the WHO reference strain of Leishmania tropica IC-305 and subsequent identification and propagation of recombinant plasmids containing L. tropica kDNA sequences. It also shows that the cloned kDNA sequences can be used as genetic markers in restriction endonuclease, Southern blot transfer, and dot blot hybridisation analysis, to identify L. tropica parasites. When the pL 305-I kDNA probe was used in hybridisation experiments with DNAs from various Leishmania reference strains, species and isolates from different host species and from different geographical locations, hybridisation was detected only with …

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Studies On Tsetse Midgut Factors That Induce Differentiation Of Bloodstream Trypanosoma Brucei Brucei In Vitro, M. O. Imbuga, E. O. Osir, V. L. Labongo, N. Darji, L. H. Otieno Jan 1992

Studies On Tsetse Midgut Factors That Induce Differentiation Of Bloodstream Trypanosoma Brucei Brucei In Vitro, M. O. Imbuga, E. O. Osir, V. L. Labongo, N. Darji, L. H. Otieno

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An in vitro system for studying the transformation of bloodstream forms of Trypanosoma brucei brucei into procylic (midgut) forms is described. In this system, transformation of the parasites was stimulated by Glossina morsitans morsitans midgut homogenates at 27° C but not at 4° C. The transformation-stimulating capacity was irreversibly destroyed by heating the midgut homogenates at 60° C for 1 h. A correlation was established between the transformation activity of the midgut homogenates and trypsin activity. The protease inhibitors (soybean trypsin inhibitor and N-p-tosyl-l-lysine-chloromethyl-ketone) inhibited trypsin activity and completely blocked the transformation of the parasites. Furthermore, the midgut homogenates could …

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Influence Of D(+)-Glucosamine On Infection Rates And Parasite Loads In Tsetse Flies (Glossina Spp.) Infected With Trypanosoma Brucei, Steve Mihok, Leonard H. Otieno, Nafisa Darji, David Munyinyi Jan 1992

Influence Of D(+)-Glucosamine On Infection Rates And Parasite Loads In Tsetse Flies (Glossina Spp.) Infected With Trypanosoma Brucei, Steve Mihok, Leonard H. Otieno, Nafisa Darji, David Munyinyi

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Teneral Glossina morsitans centralis, G. m. morsitans and G. pallidipes were infected with three different clones of Trypanosoma brucei in blood containing d(+)-glucosamine, an inhibitor of tsetse midgut lectin. On average, 5 days of d(+)-glucosamine treatment tripled infection rates, without affecting the proportion of infections that matured. Total infection rates were equal in males and females, but twice as many infections matured in males. Counts of parasites in the guts and salivary glands of 277 flies revealed order of magnitude differences among flies, with females consistently having 2-3-times as many parasites as males. Parasite numbers varied in a sex-specific manner …

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Laboratory And Field Observations On Anti-Tick Properties Of The Plant Gynandropsis Gynandra (L.) Brig, M. M. Malonza, O. O. Dipeolu, A. O. Amoo, S. M. Hassan Jan 1992

Laboratory And Field Observations On Anti-Tick Properties Of The Plant Gynandropsis Gynandra (L.) Brig, M. M. Malonza, O. O. Dipeolu, A. O. Amoo, S. M. Hassan

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A shrubby plant, abundant in east Kenya, Gynandropsis gynandra (L.) Brig., was shown to exhibit repellent and acaricidal properties to larvae, nymphs and adult Rhipicephalus appendiculatus and Amblyomma variegatum ticks. All stages of ticks avoided the leaves of the plant and a high percentage of the ticks which were continuously exposed to its leaves died; surviving ticks were weak and inactive but regained activity when exposed to fresh air. The effectiveness of the plant's leaves as a repellent and acaricide was most pronounced on nymphs and least pronounced on adults. Field investigations indicated that ticks were not found up to …

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Predation Of Free-Living Engorged Female Rhipicephalus Appendiculatus, Esther N. Mwangi, Robin M. Newson, Godwin P. Kaaya Oct 1991

Predation Of Free-Living Engorged Female Rhipicephalus Appendiculatus, Esther N. Mwangi, Robin M. Newson, Godwin P. Kaaya

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In experiments done over a period of 1 1/2 years using engorged female Rhipicephalus appendiculatus tethered in a grass plot, 42% predation was observed in long grass (40-60 cm), and 36% in short grass (6-10 cm). Deaths due to environmental factors were 4.8% and 6.8% in long and short grass, respectively. Six groups of animals were confirmed to be predators of the ticks, namely: ants, spiders, rodents, birds, lizards and shrews. The implications of these results in making tick population models, and the possibility of using predators in integrated tick-control packages are discussed. © 1991 Elsevier Science Publishers B.V.

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Infection Rates In Glossina Morsitans Morsitans Fed On Waterbuck And Boran Cattle Infected With Trypanosoma Congolense, Steve Mihok, Reardon O. Olubayo, David F. Wesonga Jan 1991

Infection Rates In Glossina Morsitans Morsitans Fed On Waterbuck And Boran Cattle Infected With Trypanosoma Congolense, Steve Mihok, Reardon O. Olubayo, David F. Wesonga

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Teneral Glossina morsitans morsitans were fed on waterbuck (Kobus defassa) and Boran cattle (Bos indicus) infected experimentally with Trypanosoma congolense clone IL2895. Infection rates in tsetse varied from 9 to 31% when fed on cattle, and from 2 to 59% when fed on waterbuck. In waterbuck, infections were often detected through the development of parasites in tsetse at times when parasitaemia could not be detected through microscopic examination of blood. Male and female, and 1- and 2-day-old flies were equally susceptible to infection on both hosts. Infection in tsetse was associated with a 14% absolute reduction in survival during the …

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Pathogenicity Of Tsetse-Transmitted Trypanosoma Congolense For Waterbuck (Kobus Defassa) And Boran Cattle (Bos Indicus), R. O. Olubayo, S. Mihok, D. F. Wesonga, E. R.M. Mbwabi Jan 1991

Pathogenicity Of Tsetse-Transmitted Trypanosoma Congolense For Waterbuck (Kobus Defassa) And Boran Cattle (Bos Indicus), R. O. Olubayo, S. Mihok, D. F. Wesonga, E. R.M. Mbwabi

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Five waterbuck (Kobus defassa) and four Boran cattle (Bos indicus) were infected with Trypanosoma congolense IL2895 using Glossina morsitans morsitans. At the same time, two waterbuck and two cattle were inoculated intravenously with bloodstream forms. With both methods of challenge, cattle had short prepatent periods followed by a continuous high parasitaemia. All cattle became severely anaemic and had to be treated with trypanocidal drugs to prevent death. In contrast, tsetse and intravenous challenge of waterbuck resulted in a long prepatent period, followed by brief, intermittent levels of low parasitaemia, and eventual selfcure. Waterbuck did not become anaemic, even during short …

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In Vivo Demonstration Of Maturational Changes Of The Chronotropic Response To Α-Adrenergic Stimulation, Jorge Mccormack, Henry Gelband, Juan Villafañe, Hui Xu, Adrienne Stolfi, Arthur S. Pickoff Jan 1988

In Vivo Demonstration Of Maturational Changes Of The Chronotropic Response To Α-Adrenergic Stimulation, Jorge Mccormack, Henry Gelband, Juan Villafañe, Hui Xu, Adrienne Stolfi, Arthur S. Pickoff

Medical Education Faculty Publications

In vitro studies suggest that neonates and adults may have different cardiac chronotropic responses to a-adrenergic stimulation. To investigate these differences in vivo, three groups of dogs were studied. Group I = 12 puppies, ages 3-7 days; group II = 12 puppies ages 8-15 days, and group III = seven adult dogs. Heart rate and blood pressure determinations were made in the control setting and then after combined β-adrenergic and parasympathetic blockade (propranolol 0.6 mg/kg and bilateral vagotomies). Alpha-stimulation was then achieved with phenylephrine given in doses of 0.5, 1.0, and 10.0 μg/kg/ min. A second, high dose of propranolol …

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Atrioventricular Nodal Function In The Immature Canine Heart, Jorge Mccormack, Henry Gelband, Hui Xu, Juan Villafane, Adrienne Stolfi, Arthur S. Pickoff Jan 1988

Atrioventricular Nodal Function In The Immature Canine Heart, Jorge Mccormack, Henry Gelband, Hui Xu, Juan Villafane, Adrienne Stolfi, Arthur S. Pickoff

Medical Education Faculty Publications

Previous studies have suggested that the atrioventricular nodal functional refractory period in the neonate is equal to or shorter than that of the ventricle, providing little or no protection to the ventricle against rapid atrial rates and allowing closely coupled atrial beats to fall within the ventricular vulnerable period. We evalu­ated atrioventricular node function in 21 mongrel neonatal puppies, 3-15 days old, and 15 adult dogs utilizing intracardiac His bundle recording and stimulation techniques. The mean atrioventricular nodal functional refractory period (173.1 ± 20.0 ms) exceeded both the ventricular effective refractory period (139.5 ± 14.3) and ventricular functional refractory period …

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Digoxin-Quinidine Interaction In The Neonatal Dog, Arthur S. Pickoff, Adrienne Stolfi, Henry Gelband Jan 1986

Digoxin-Quinidine Interaction In The Neonatal Dog, Arthur S. Pickoff, Adrienne Stolfi, Henry Gelband

Medical Education Faculty Publications

The effects of quinidine on steady state serum and tissue digoxin concentrations in the neonatal dog were studied. To determine the effects of quinidine on serum digoxin concentrations, two groups of neonates were evaluated: Group I (n = 11) was digitalized with 40 μg/kg body weight, intramuscularly, and placed on a 10 μg/kg per day maintenance dose; Group II (n = 7) was digitalized with 50 μg/kg per day, intraperitoneally, and placed on a 20 μg/kg per day maintenance dose. After 10 days of digoxin alone, quinidine was coadministered (30 mg/kg per day, intraperitoneally) for 7 days. Serum digoxin concentrations …

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Thesis 5-Ht 1983.Docx, Edward Yu Jul 1983

Thesis 5-Ht 1983.Docx, Edward Yu

Data and Test Instruments

No abstract provided.

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Tip-Recording From Ixodid Tick Olfactory Sensilla: Responses To Tick Related Odours, S. M. Waladde Dec 1982

Tip-Recording From Ixodid Tick Olfactory Sensilla: Responses To Tick Related Odours, S. M. Waladde

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The tip-recording technique was used to obtain electrophysiological responses from the tarsal olfactory sensilla, md3 and apl, in ixodid ticks, Rhipicephalus appendiculatus and Amblyomma variegatum. Stimuli tested were phenolic compounds, 2,6-dichlorophenol, P-cresol, phenol and salicylaldehyde, reported to act as sex pheromone of various ixodid ticks. Certain cells responded to vapours from cartridges charged with as little as 0.04ng of 2,6-dichlorophenol while at least 200 μg of any of the other compounds was required to exert the minimum effect. Response patterns of cells in sexually immature and mature males were similar but response levels were higher among sexually immature males. Vapours …

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The Identification Of Ecdysterone (20-Hydroxyecdysone) In 3 Species Of Molluscs (Gastropoda: Pulmonata), D. L. Whitehead, K. Sellheyer Oct 1982

The Identification Of Ecdysterone (20-Hydroxyecdysone) In 3 Species Of Molluscs (Gastropoda: Pulmonata), D. L. Whitehead, K. Sellheyer

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Ecdysterone has been identified in the schistosomiasis vector Biomphalaria glabrata Say and in Helix aspersa Müller as well as in Lymmaea stagnalis L. by chromatography, bioassay, radioimmunoassay, derivatization and by mass spectroscopy. Analysis of the food, faeces and hepatopancreas suggest that the sterol is derived from the diet. The probable function of ecdysterone in relation to calcification of the shell is discussed in this paper. © 1982 Birkhäuser Verlag.

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The Chironian Vol. 25 No. 2, New York Medical College Jun 1963

The Chironian Vol. 25 No. 2, New York Medical College

The Chironian

No abstract provided.

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