Results 211 to 220 of about 5,332 (240)
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Dermacentor variabilis: Acquired resistance to ticks in BALB/c mice
Experimental Parasitology, 1985To assess the ability of Dermacentor variabilis larvae to feed on mice during repeated infestations, known numbers of larvae were confined to the skin of BALB/c mice within plastic capsules, and different skin sites were used in four successive infestations.
J.R. Aleen, N. denHollander
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Implications of Tick Size on the Quantification of Engorgement in Female Dermacentor variabilis
The Journal of Parasitology, 1980Log-log plots of unfed and fed tick weight on corresponding values of the scutal index (SI = scutal length x scutal width) show similar slopes for female D. variabilis from two laboratory populations. As derived from these plots, the relative engorgement state of a tick at any time during feeding can be expressed as the ratio of the cube roote of ...
Obenchain Fd, Oliver Mh, Leahy Mg
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The Journal of Parasitology, 1982
Disruption of sex pheromone activity in female Rocky Mountain wood ticks, Dermacentor andersoni Stiles, and American dog ticks, Dermacentor variabilis (Say), was achieved by treatment with the quinones para-benzoquinone and menadione. The most effective treatments were those administered by inoculation to unfed, mature, adult females prior to feeding ...
Daniel E. Sonenshine +2 more
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Disruption of sex pheromone activity in female Rocky Mountain wood ticks, Dermacentor andersoni Stiles, and American dog ticks, Dermacentor variabilis (Say), was achieved by treatment with the quinones para-benzoquinone and menadione. The most effective treatments were those administered by inoculation to unfed, mature, adult females prior to feeding ...
Daniel E. Sonenshine +2 more
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Kadam virus: Neutralization studies and laboratory transmission by dermacentor variabilis
Transactions of the Royal Society of Tropical Medicine and Hygiene, 1972Abstract By neutralization test, Kadam virus, originally isolated from ticks (Rhipicephalus pravus) collected from a cow in Uganda, is distinct from 39 other group B viruses and in particular shows no close relationship to members of the TBE complex. Attempts to infect mosquitoes (Aedes aegypti) and mosquito cell lines (Ae.
Robert E. Shope, Wilson Nguithi Mugo
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American Journal of Veterinary Research, 1989
SUMMARY Transstadial and transovarial transmission of Anaplasma marginale by Dermacentor variabilis were attempted with ticks exposed to the organism once by feeding as larvae or nymphs, and twice by feeding as larvae and nymphs. Typical colonies of A marginale were in gut tissues of adults that were infected as larvae, larvae and nymphs, and as nymphs;
R W, Stich +5 more
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SUMMARY Transstadial and transovarial transmission of Anaplasma marginale by Dermacentor variabilis were attempted with ticks exposed to the organism once by feeding as larvae or nymphs, and twice by feeding as larvae and nymphs. Typical colonies of A marginale were in gut tissues of adults that were infected as larvae, larvae and nymphs, and as nymphs;
R W, Stich +5 more
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Characterization of Dermacentor variabilis Molecules Associated with Rickettsial Infection
Annals of the New York Academy of Sciences, 2006Abstract: To ultimately define the virulence factors of rickettsiae, an understanding of the biology of the organism is essential. Comprehension of the pathogen–human interaction is critical to the development of control measures; and, in the case of vector‐borne diseases, the role of the vector in maintaining and transmitting pathogens to vertebrate
Albert Mulenga +3 more
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Interactions between Rickettsiae andDermacentor variabilisTicks
Annals of the New York Academy of Sciences, 2003Abstract:Tick‐borne spotted fever group rickettsiae are maintained in nature primarily through transstadial and transovarial transmission in their vector. In the tick,Dermacentor variabilis, the infection of, and persistence within, the ovaries are critical steps in the transmission cycle of rickettsiae from one generation to the next.
Jason A. Simser +3 more
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Cell and Tissue Research, 1987
Light- and electron-microscopic enzyme cytochemistry was used to localize acetylcholinesterase (AChE) activity in the synganglion (brain) of the tick Dermacentor variabilis. High AChE activity was observed throughout the neuropil as well as adjacent to most neuronal perikarya. Intracellular activity was not observed by light microscopy.
Daniel S. Sonenshine +4 more
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Light- and electron-microscopic enzyme cytochemistry was used to localize acetylcholinesterase (AChE) activity in the synganglion (brain) of the tick Dermacentor variabilis. High AChE activity was observed throughout the neuropil as well as adjacent to most neuronal perikarya. Intracellular activity was not observed by light microscopy.
Daniel S. Sonenshine +4 more
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Thelytoky in the American Dog Tick, Dermacentor Variabilis (Acari: Ixodidae)1
Journal of Medical Entomology, 1984Parthenogenetically derived Dermacentor variabilis ticks were reared to adults. Only 5.6% of the eggs deposited by 46 virgin females hatched, and all adults reared from these eggs (32) were females. The modal chromosome number of these females was 22, and oogenesis appeared normal.
Daniel E. Sonenshine +2 more
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Experimental & Applied Acarology, 1998
A common method for sampling tick populations is flagging, which is a method of dragging a white cloth over a plant substrate for a fixed distance along a transect. Flagging over rough physical surfaces or using long subtransect lengths could lead to the underestimation of tick densities.
Xiaohong Li, John E. Dunley
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A common method for sampling tick populations is flagging, which is a method of dragging a white cloth over a plant substrate for a fixed distance along a transect. Flagging over rough physical surfaces or using long subtransect lengths could lead to the underestimation of tick densities.
Xiaohong Li, John E. Dunley
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