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At least 253 records · Page 14Linked to original sources
PubMed1989

Ectoparasitic acari found on golden lion tamarins (Leontopithecus rosalia rosalia) from Brazil.

Anesthetized golden lion tamarins (Leontopithecus rosalia rosalia), a highly endangered species, were examined for ectoparasites by brushing the fur and swabbing the ears. Ectoparasites recovered from the fur included four species of immature ticks (Amblyomma spp.), three species of chiggers (Euschoengastia sp., Microtrombicula brennani and Speleocola tamarina), and one species of follicular mite (Rhyncoptes anastosi). Ectoparasites do not seem to be of particular significance to the health of the golden lion tamarin; this may in part result from grooming.

Acari↗
PubMed1998

[Circannual rhythm of the risk of IgE-dependent sensitization to acari depending on the birth date. Interpretation and practical consequences in prevention].

The role of allergenic environment during the first weeks of life for the future development of IgE-dependent allergy is well documented for cyclic allergens. That is less evident for permanent antigens as house dust mites. The aim of this work was to find a possible relation between the birth date and house dust mite hypersensitivity to have a better prevention. The result of Rast d1 which show an IgE-dependent allergy to Dermatophagoides pteronyssinus was correlated to the month of birth of 5, 747 children and adolescents with a suspected allergic respiratory disease. Possible bias induced by sex and personal/family history were mathematically corrected. A correlation curve between the month of birth and the frequency of positive Rast d1 was deduced. There is a circannual rhythm risk for house dust mite allergy according to the month of birth. It draw a sinusoid curve with a peak at 104 percent in october and a minimum at 96 percent in april. These data were discussed. The minimum of risk was possibly due to better early ecologic way of life for infants born during the spring. Preventive methods were available against house dust mites. They could be organized for infants. We hope that more pediatricians were concerned by primary prevention of house dust mite allergy.

Acari↗
PubMedDate not supplied

[Rhinitis and nasal polyps. Their association with domestic acari].

BACKGROUND: In persons older than one year, respiratory allergies can be studied from the etiologic viewpoint using skin test with specific allergens. MATERIAL AND METHOD: The objective of this research is to make an assessment of the skin reactivity to mites Dermatophagoides pteronyssinus, Dermatophagoides siboney and Blomia tropicalis in 76 patients with a diagnosis of allergic and nasal polyps which had been treated in Otorhinolaryngologie and sent to the service of allergologie in Esmeralda Camagüey. Every patient received a skin puncture test twice. Fifteen minutes later the hives began to appear and we measured the longer diameter and the perpendicular diameter of every hive and we calculated an average. We also took the average size of the hives in the second test, considering them positive when the medium diameter was < 3 mm and negative when it was < 3 mm. In those patients suffering from rhinitis the greatest positive frequency was for those with Dermatophagoides pteronyssinus and the greatest negative frequency to Dermatophagoides siboney. In patients with nasal polyps there was a positive predominance (p < 0.05) to Dermatophagoides pteronyssinus and a negative predominance (p < 0.05) to Dermatophagoides siboney. So, we many conclude that the mite Dermatophagoides pteronyssinus causes more positive reactions than Dermatophagoides siboney and Blomia tropicalis in those patients with allergic rhinitis and nasal polyps.

Acari↗
PubMed2000

First report on sensitization to allergens of a house dust mite, Suidasia pontifica (Acari: Saproglyphidae).

A species of house dust mite, Suidasia pontifica, was recently shown to produce allergens affecting man. The species may be as important as other allergen producing mite in sensitization and causing allergic symptoms in Malaysians. Surveys conducted demonstrated that 80% of the houses surveyed were positive for this mite with densities ranged from 2 to 50 mites per gram of dust. Colonies of the species has been successfully established and materials from those colonies have been used to produce extracts for studies on sensitization to the mites. A total of 85 suspected allergic rhinitis patients were tested and 74.1% demonstrated positive reactions. Extract of this mite should be considered for routine diagnostic testing and possible immunotherapy.

Acari↗
PubMedDate not supplied

[Regeneration of limbs and sensory organs in Ixodid ticks (Acari, Ixodeidea, Ixodidae and Argasidae)].

We present a review of our own and literature data on reparative regeneration in ixodid ticks (chelicerate arthropods). Ticks have a high potential for reparative regeneration and a close relationship between regeneration and development determined by similar hormonal regulatory mechanisms. These mechanisms depend on ecdysteroid hormones, which participate in the initiation of both processes, and juvenile hormones, which direct these processes either to the maintenance of larval features or to the development of nymphal and adult features. We present a detailed analysis of the regeneration of Haller's sensory organs in ixodid ticks and propose an hypothesis about the role of juvenile hormones in the modification of morphogenetic processes in this group. Furthermore, we present data on the effects of insect juvenile hormone analogs (methoprene and fenoxycarb) on the regeneration of Haller's organ, which support this hypothesis. Studies on reparative regeneration in arthropods provide a broader view of the problem of repair morphogenesis in animals.

Acari↗
PubMed2001

Aggregation pheromone activity of the female sex pheromone, beta-acaridial, in Caloglyphus polyphyllae (Acari: Acaridae).

Caloglyphus (= Sancasania) polyphyllae discharges from a pair of opisthonotal glands a characteristic set of volatiles, i.e. three monoterpenes and seven hydrocarbons. Among them, beta-acaridial, which is known as the female sex pheromone of the species and has antifungal activity, was newly identified as the aggregation pheromone for unfeeding and unmating mites. Feeding mites, however, exhibited sexually aroused behavior instead of the tendency to cluster when exposed to beta-acaridial. This is the first example of the compound demonstrating two pheromone functions depending upon the circumstances faced by the mites.

Acari↗
PubMed1975

[Toxicity of insecticides-acaricides were studied for three phytoghagous mites (Acari: Tetranychidae) using two different laboratory methods (author's transl)].

The aim of this work was to learn the toxicity of acaricides: monocrotophos, chlorobenzilate and chlorphenamidine when used as an immersion and as a spray on the phytophagous mites, Tetranychus (T) urticae, Tetranychus (T) cinnabarinus and Tetranychus (T) ludeni under laboratory conditions. It was concluded that the mite T. urticae was sensitive to chlorphenamidine at least when used as a spray without killing them in a significant level. However the mites T. cinnabarinus and T. ludeni were sensitive to chlorphenamidine when using immersion method. The monocrotophos and the chlorobenzilate were toxic of the three species of mites using though the employed methods.

Acari↗
PubMedDate not supplied

[In vitro and in vivo acari tests].

We studied 40 children with one o more perennial allergic diseases (bronchial asthma, allergic rhinitis, and/or atopic dermatitis) to assess the value in our country of in vivo and in vitro tests more frequently used in the diagnosis of allergy, such as total serum IgE, specific allergen IgE (RAST) and prick skin test in patients sensitives to D. pteronissinus, D. farinae or both. All patients had positive prick skin tests. Total serous IgE was elevated in 95% of cases with poor correlation coefficient (r) between prick skin test reactivity and total serous IgE concentration with no statistical significance. On the other hand, 95% of patients showed a positive RAST with a correlation coefficient of 0.31 (p less than 0.05). We concluded that in our country clinical history and prick skin tests are sufficiently accurate in a reasonable way to make a diagnosis of allergic etiology in patients sensitives to mites of the house dust.

Acari↗