Specific cross-immunity between Hymenolepis nana and H. diminuta: immunization with heterologous and homologous light infections

1988 ◽  
Vol 62 (2) ◽  
pp. 115-123 ◽  
Author(s):  
F. Gabriele ◽  
D. Wakelin ◽  
C. Palmas
Keyword(s):  
Related Species ◽  
Reciprocal Cross ◽  
Concurrent Infection ◽  
Hymenolepis Nana ◽  
Cyst Infection ◽  
Cd1 Mice ◽  
Cross Immunity ◽  
Homologous Challenge

ABSTRACTThe consequences of previous and concurrent infection with two related species of cestodes, Hymenolepis nana and H. diminuta, were studied in CD1 mice. A H. diminuta infection strongly affected the establishment and the survival of a secondary H. nana egg or cyst infection administered 30 days later. An infection of 20 H. nana eggs strongly protected against a 5-cyst H. diminuta challenge, whereas an infection of 10 H. nana cysts was ineffective; 20 H. nana eggs also protected against a challenge with 5 cysts of H. diminuta administered 5 days later. No effects were observed in either parasite during a concurrent infection established by administration of cysts. An H. nana egg-infection was unable to affect the establishment of a secondary H. nana cyst-infection given 1 month later; however a significant decrease in growth was found. Similar results were found when a primary H. nana egg-infection was followed 5 days later by the homologous cyst-infection. But an infection with 5 H. nana cysts was unable to protect against a homologous challenge of 5 cysts or 20 eggs. The reciprocal cross immunity between the heterologous parasites and the failure of protection of homologous challenges are discussed in relation to light infections.

Cross-immunity to Schistosoma mansoni and S. haematobium in the hamster

Parasitology ◽  
1976 ◽  
Vol 73 (1) ◽  
pp. 53-64 ◽  
Author(s):  
M. A. Smith ◽  
J. A. Clegg ◽  
G. Webbe
Keyword(s):  
Schistosoma Mansoni ◽  
Primary Infection ◽  
Rabbit Antiserum ◽  
The Other ◽  
Stage Of Development ◽  
Recovery Assay ◽  
Cross Immunity ◽  
Common Antigens ◽  
High Level ◽  
Homologous Challenge

SummaryHamsters (WO strain) with a primary infection of Schistosoma mansoni or S. haematobium rapidly developed immunity to homologous challenge judged by the lung recovery assay. Immunity was detected at 4–5 weeks and reached a plateau 6 weeks after infection.Using this information, hamsters with an 8-week primary infection with S. mansoni or S. haematobium were tested for resistance to homologous reinfection and resistance to a challenge with the other species of schistosome. Primary infection with S. mansoni or S. haematobium conferred a high level of immunity to reinfection with either species of schistosome judged by the perfusion assay, involving recovery of adult worms 6–10 weeks following challenge. Estimation of the level of immunity with the lung recovery assay, 5 days after challenge, indicated that immunity due to a primary infection with S.mansoni acted at or before migration of the challenge through the lungs but immunity stimulated by a primary S. haematobium infection was only partially effective at the lung stage and substantial destruction of challenging organisms occurred at a later stage of development.Antibodies in immune sera of hamsters with a primary S. mansoni or S. haematobium infection were shown to bind to common antigens on the surface of young schistosomula of either species by u.v. microscopy using as detecting agent a fluorescein-labelled rabbit antiserum directed against hamster globulins.

Other adult and larval cestodes

2011 ◽  
Author(s):  
Sheelagh Lloyd
Keyword(s):  
Life Cycle ◽  
Intermediate Host ◽  
Related Species ◽  
Intermediate Hosts ◽  
Hymenolepis Nana ◽  
Taenia Multiceps ◽  
Raw Fish ◽  
Diphyllobothrium Latum ◽  
Direct Life Cycle

Adult Diphyllobothrium latum is acquired by consumption of raw fish by persons living around lakes/reservoirs/rivers. Hymenolepis nana can have a direct life cycle so eggs produced by adults in man are important in transfer between humans. The contribution of rodents and the indirect life cycle through arthropods need re-evaluation. Other minor adult cestode infections are described.Man can be an intermediate host for tissue metacestodes. Taenia multiceps and related species are that acquired from canids and produce a coenurus. Spirometra spp. pleurocercoids are acquired from copepod or reptile/amphibian/mammalian intermediate hosts. Other metacestode infections are very rare.

Ultrastructural Changes of the Symbiotic Chlorella-Like Alga Isolated from Hydra Viridis

1982 ◽  
Vol 40 ◽  
pp. 320-321
Author(s):  
K.W. Lee ◽  
R.H. Meints ◽  
D. Kuczmarski ◽  
J.L. Van Etten
Keyword(s):  
Time Course ◽  
Reciprocal Cross ◽  
Ultrastructural Level ◽  
Ultrastructural Changes ◽  
Symbiotic Relationship ◽  
Cell Recognition ◽  
Green Hydra ◽  
Different Strains ◽  
Hydra Viridis

The physiological, biochemical, and ultrastructural aspects of the symbiotic relationship between the Chlorella-like algae and the hydra have been intensively investigated. Reciprocal cross-transfer of the Chlorellalike algae between different strains of green hydra provide a system for the study of cell recognition. However, our attempts to culture the algae free of the host hydra of the Florida strain, Hydra viridis, have been consistently unsuccessful. We were, therefore, prompted to examine the isolated algae at the ultrastructural level on a time course.

Effects of oxygen level on metabolism and development of seedlings of Trapa natans and two ecologically related species

1992 ◽  
Vol 86 (1) ◽  
pp. 168-172 ◽  
Author(s):  
Faustino Menegus ◽  
Liliana Cattaruzza ◽  
Leonardo Scaglioni ◽  
Enzio Ragg
Keyword(s):  
Related Species ◽  
Oxygen Level ◽  
Trapa Natans

Oil from Livers of Sharks and Related Species

1904 ◽  
Vol 58 (1493supp) ◽  
pp. 23927-23928
Author(s):  
Charles H. Stevenson
Keyword(s):  
Related Species

On Riccia marginata and related species (Ricciaceae, Marchantiophyta)

2012 ◽  
Vol 46 ◽  
pp. 298-305 ◽  
Author(s):  
A. D. Potemkin ◽  
T. Ahti
Keyword(s):  
Related Species ◽  
Lake Ladoga ◽  
Leningrad Region ◽  
Sem Images ◽  
North Shore ◽  
The North ◽  
Molecular Studies ◽  
The Future ◽  
The Town

Riccia marginata Lindb. was described by S. O. Lindberg (1877) from the outskirts of the town of Sortavala near the north shore of Lake Ladoga, Republic of Karelia, Russia. The species has been forgotten in most recent liverwort accounts of Europe, including Russia. Lectotypification of R. marginata is provided. R. marginata shares most characters with R. beyrichiana Hampe ex Lehm. It differs from “typical” plants of R. beyrichiana in having smaller spores, with ± distinctly finely areolate to roughly papillose proximal surfaces and a narrower and shorter thallus, as well as in scarcity or absence of marginal hairs. It may represent continental populations of the suboceanic-submediterranean R. beyrichiana, known in Russia from the Leningrad Region and Karelia only. The variability of spore surfaces in R. beyrichiana is discussed and illustrated by SEM images. A comparison with the spores of R. bifurca Hoffm. is provided. The question how distinct R. marginata is from R. beyrichiana needs to be clarified by molecular studies in the future, when adequate material is available. R. marginata is for the time being, provisionally, included in R. beyrichiana.

New orchid species (Orchidaceae) in the flora of Laos

2019 ◽  
pp. 25-40
Author(s):  
L. V. Averyanov ◽  
Khang Sinh Nguyen ◽  
T. V. Maisak ◽  
Hiep Tien Nguyen ◽  
N. L. Orlov ◽  
...  
Keyword(s):  
New Species ◽  
Related Species ◽  
Field Studies ◽  
Regional Literature ◽  
Orchid Species ◽  
Two New Species

This paper continues the publication of new data obtained during field studies in remote and poorly studied regions of Laos in 2015–2018. It provides descriptions of two new species (Bulbophyllum brachyscapum Aver. and Sunipia saccata Aver.), emended descriptions of two previously published but insufficiently known species (Cleisostoma verrucosum Aver., Oberonia vesiculifera Aver.) and reports of eight species newly recorded in the flora of Laos (Biermannia calcarata Aver., Bulbophyllum farreri (W. W. Sm.) Seidenf., Didymoplexiella trichechus (J. J. Sm.) Garay, Eria eriopsidobulbon C. S. P. Parish et Rchb. fil., Habenaria ciliolaris Kraenzl., Liparis caudata Aver. et K. S. Nguyen, Odontochilus umbrosus (Aver.) Ormerod, and Porpax ustulata (C. S. P. Parish et Rchb. fil.) Rolfe). Appropriate citations of regional literature, colour illustrations, data on types and distribution, descriptions, etymology, as well as notes on taxonomy and related species are provided for the studied species.

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