Results 221 to 230 of about 3,141 (243)

Salivary glands of Amblyomma cajennense (Acari: Ixodidae): a histological and an ultrastructural overview

Experimental and Applied Acarology, 2011
The present study on the salivary glands of semi-engorged Amblyomma cajennense females has identified the various cell types present in this tissue and allowed its morphohistochemical characterization. Marking techniques were applied to detect polysaccharides (PAS), proteins (bromophenol blue), lipids (Nile blue) and calcium (von Kossa), as well as ...
Denardi, Sandra Eloisi, Scopinho Furquim, Karim Christina, Bechara, Gervasio Henrique, Camargo-Mathias, Maria Izabel   +3 more
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Development of Resistance to Nymphs of Amblyomma cajennense Ticks (Acari:Ixodidae) in Dogs

Annals of the New York Academy of Sciences, 2002
Abstract: Ticks have long been regarded as constraints to humans and domestic animals, but hosts often develop resistance to ticks after repeated infestations. The purpose of this investigation was to study the possible acquisition of immunity in domestic dogs to nymphs of A.
Gervásio Henrique Bechara, Luciana S. Mukai, Matias Pablo Juan Szabó, A. Castro Netto   +3 more
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Acaricidal activity of thymol on larvae and nymphs of Amblyomma cajennense (Acari: Ixodidae)

Veterinary Parasitology, 2011
The aim of the present study was to evaluate the acaricidal efficacy of thymol on unengorged and engorged larvae and engorged nymphs of Amblyomma cajennense. To perform the test for unengorged larvae, the larval packet technique was employed and mortality was evaluated 24h after the test, while for engorged larvae and engorged nymphs the immersion ...
Tainara Massoni, Ralph Maturano, Erik Daemon, Caio Márcio de Oliveira Monteiro, Fernanda Calmon Brito, Andressa da Silva Mendes   +5 more
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Natural Infection of the Tick, Amblyomma Cajennense, with Rickettsia Rickettsii in Panama

The American Journal of Tropical Medicine and Hygiene, 1953
The occurrence of Rocky Mountain spotted fever on the Isthmus of Panama was established for the first time in 1950 when a highly virulent strain of Rickettsia rickettsii was isolated by the author from the blood of a 26 year old Panamanian farmer who died February 8 of that year, shortly after admission to the hospital.
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Hypersensitivity Induced in Dogs by Nymphal Extract of Amblyomma cajennense Ticks (Acari:Ixodidae)

Annals of the New York Academy of Sciences, 2002
Abstract: In general, hosts develop resistance to ticks after repeated infestations; nevertheless, several studies on naturally occurring host‐tick interactions were unable to detect resistance of hosts to ticks even after repeated infestations. The purpose of this investigation was to study the type of cutaneous hypersensitivity to unfed nymphal ...
Mukai, Luciana S., Castro Netto, A., Szabó, M. P J, Bechara, G. H.   +3 more
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Survival and Water-Balance Characteristics of Unfed Adult Amblyomma cajennense (Acari: Ixodidae)

Journal of Medical Entomology, 1996
Off-host survival, water balance, and cold tolerance of unfed adult, Cayenne ticks, Amblyomma cajennense (F.), were examined to evaluate species characteristics important to zoogeography and off-host ecology. Survivorship decreased when males and females were subjected to progressively drier constant environmental conditions.
Michael T. Longnecker, Gle N R. Needham, O. F. Strey, Pete D. Teel   +3 more
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Morphological characterization of the ovary and vitellogenesis dynamics in the tick Amblyomma cajennense (Acari: Ixodidae)

Veterinary Parasitology, 2004
In this work we describe the internal morphology of the female reproductive system of the cayenne tick Amblyomma cajennense. This system is represented by a panoistic ovary, which lacks nurse cells in the germarium. This ovary consists of a single tube, in which a large number of oocytes develop asynchronously, thus accompanying the processes of yolk ...
Denardi, S. E., Bechara, G. H., de Oliveira, P. R., Nunes, E. T., Saito, K. C., Mathias, Maria Izabel Camargo   +5 more
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Amblyomma cajennense (Acari: Ixodidae) tick populations susceptible or resistant to acaricides in the Mexican Tropics

Veterinary Parasitology, 2013
The objectives of the present study were: (i) to identify the frequency of cattle farms with a cohabitation of Amblyomma cajennense and Rhipicephalus microplus, (ii) to determine the status of susceptibility or resistance to acaricides used in Veracruz, Mexico, on A. cajennense populations and (iii) to identify factors associated with A.
J. Osorio-Miranda, Miguel Ángel Alonso-Díaz, Agustín Fernández-Salas, F. Martínez-Ibáñez   +3 more
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Cross-mating experiments with geographically different populations of Amblyomma cajennense (Acari: Ixodidae)

Experimental and Applied Acarology, 2011
The present study evaluated the reproductive compatibility of the crosses between adult ticks of the following three geographically different populations of Amblyomma cajennense: State of São Paulo (SP), southeastern Brazil; State of Rondônia (RO), northern Brazil; and Colombia (CO). In addition, crosses between A.
Marcelo Bahia Labruna, Herbert Sousa Soares, Thiago F. Martins, Ricardo R. Cabrera, João Fabio Soares   +4 more
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Experimental Transmission of Q Fever by Amblyomma Cajennense

The American Journal of Tropical Medicine and Hygiene, 1949
Since Davis and Cox (1) first isolated the causative agent of Q fever from Dermacentor andersoni, several species of ticks have been incriminated in the epidemiology of this disease in various parts of the world. Investigations implicating the following species were reviewed by Kohls in 1948 (2): in Australia, Haemaphysalis humerosa and H.
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