Search PubMed⌕ Search

SEARCH · Search PubMed

Results for “Pyroglyphidae”

Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 19 recordsLinked to original sources
PubMed1984

[Occurrence of housedust mites (Astigmata; Pyroglyphidae) in stables].

Occurrence of house-dust mites (Astigmata; Pyroglyphidae) in stables. The house-dust mite Dermatophagoides farinae was found in 5 samples derived from a conventional henhouse with fowls and pigeons and from a test animal hutch with rats, mice and rabbits. 63 samples derived from conventional sheds, pigsties and hutches as well as from conventional henhouses and large-scale poultry farms showed negative results. Besides mites of the family Pyroglyphidae mites of the Tyroglyphidae family and/or mucedine were found, which affect the development of mite populations. House-dust mites should be considered in the etiology of allergic diseases of dog, cat and livestock.

Animals↗
PubMed1999

[House dust mites (Acari: Pyroglyphidae) as the frequent cause of allergies in humans].

House dust mites from the family Pyroglyphidae (Dermatophagoides pteronyssinus, D. farinae and Euroglyphus maynei) are recognized as the major source of allergens in house dust and indoor environment. In this review their allergenicity, diagnostics and some biochemical and allergological assays of the allergens produced by these mites are discussed. A brief summary of the mite-derived allergens, their occurrence in some indoor environments and annual dynamics of the mite populations are provided as background.

Animals↗
PubMed1992

The colonisation of new houses by house dust mites (Acari: Pyroglyphidae).

House dust mites, Dermatophagoides species (Acari: Pyroglyphidae), produce allergens, known for the provocation of asthma and other allergic reactions. To determine the time needed for complete colonisation of a new house by house dust mites, dust samples were collected from carpets of houses varying from 2 weeks to 2 years in age. In contrast to the expectation, no relation was found between age of the houses on the one hand and average levels of mite-allergens Der pI and Der pII and mite numbers on the other. However, presence of dogs appeared to be positively related to allergen levels. Furthermore, carpets in bedrooms appeared to contain more allergens than carpets in living-rooms. Finally, the age of the mattress was not related to allergen levels of bedroom floors.

Allergens↗
PubMed2001

House dust mites (Acari: Pyroglyphidae) in the cities of Gdańsk and Gdynia (northern Poland).

277 samples of house dust collected in 1996-1998 from 17 flats, three hospitals, two hotels and one students' hostel situated in the cities of Gdansk and Gdynia were subjected to acarological examination. Acari were found in 50 (37.3%) of 134 samples from the flats, in 11 (15.5%) of 71 samples from the hospitals and in 13 (18.1%) of 72 samples from the hotels. The majority of mites (91.6%) was found in samples that originated from the private flats. 95.0% of mites from the flats, 35.0% mites from the hotels and 8.0% mites from the hospitals belonged to two dust mite species of the family Pyroglyphidae: Dermatophagoides pteronyssinus and Dermatophagoides farinae. D. farinae was significantly predominant and composed 82.8% of the whole pyroglyphid collection. Samples from private flats contained significantly more mites than those from hospitals and hotels: mean mites densities per 1 gram of dust were 13.07, 1.03 and 1.00, respectively. The authors suggest that only density of house dust mites in private flats may be clinically important.

Air Pollution, Indoor↗
PubMed1995

Present state of research on house dust mites (Pyroglyphidae) in the Czech Republic.

Systematic research on house dust mites in the Czech Republic started in the early seventies, when mite fauna of human dwellings and distribution of pyroglyphid mites were studied. Special attention was paid to old-age-pensioners' homes and children's sanatoria. Pyroglyphidae were found also in the city air and in the dust of city pavements, especially in localities with high occurrence of domestic pigeons. While D. pteronyssinus and D. farinae mostly occurred in permanently inhabited flats, Euroglyphus maynei prevailed in recreation houses and some hospitals. Autumn increase of population density occurred in both, D. pteronyssinus and D. farinae populations, however, the number of protonymphs was remarkable higher than that of other developmental stage in D. farinae population. Special rearing technique was developed for the mass-culture of mites and a Czechoslovak patent was assigned to the technology of allergen preparation for the diagnostics and the desensibilization of patients with house-dust allergies.

Aged↗
PubMed2003

Effects of wet cleaning with disodium octaborate tetrahydrate on dust mites (Acari: Pyroglyphidae) in carpet.

In a controlled laboratory study, disodium octaborate tetrahydrate (DOT) applied to carpets with a carpet-cleaning machine at a rate of 509 ml DOT/8.15 liter H2O/100 m2 (two cups DOT/2 gal H2O/100 feet2) reduced survival and population growth of live Dermatophagoides farinae and Dermatophagoides pteronyssinus by > or = 98% compared with water-cleaned and uncleaned carpets at 8 wk postcleaning. Cleaning with DOT was more effective against D. pteronyssinus than D. farinae.

Animals↗
PubMed1999

[Biology of house dust mites (Acari: Astigmata: Pyroglyphidae)].

This article is a first part of the rewiev of the house-dust-mite-atopy problem data. It includes informations on biology of these mites with emphasis of medical aspect and control. We hope that these informations will be of considerable interest to many readers because of the greatly increased investigations into the role of house dust mite sensitivity in allergic diseases.

Animals↗
PubMed2006

Toxicity of spray and fumigant products containing cassia oil to Dermatophagoides farinae and Dermatophagoides pteronyssinus (Acari: Pyroglyphidae).

The toxicity of formulations of oil of cassia, Cinnamomum cassia Blume, (20 and 50 g L(-1) sprays and 100% oil-based fumigant) to adult Dermatophagoides farinae Hughes and D. pteronyssinus Trouessart was examined using contact and vapour-phase toxicity bioassays. Results were compared with the lethal activity of three commercial acaricides: benzyl benzoate, dibutyl phthalate and diethyl-m-toluamide (deet). The contact toxicity of cassia oil to both dust mite species was comparable with that of benzyl benzoate but was higher than that of the other two acaricides. Sprays containing 20 and 50 g L(-1) cassia oil were effective against both mite species when applied to fabric, glass, paper, plastic, tin or wood substrates. Applications of the 50 g L(-1) spray to different space volumes and surface areas determined that 50-60 mg of cassia oil was needed to control dust mites in 3.4 m(3) or in 1 m(2). In tests with fumigant devices, toxicity varied according to the thickness of non-woven fabric covering the device, the exposure time, the number of fumigant devices used and the volume of the space sprayed. Fumigant toxicity to adult D. pteronyssinus was more pronounced with devices enclosed in thinner (40 microm) versus thicker (45 or 50 microm) non-woven fabric covers. A single fumigant device with a 40 microm thick non-woven fabric cover resulted in substantial control in a space of 0.05 m(3) but exhibited only moderate to weak control in spaces >or= 0.097 m(3) at 4 days after application. Two fumigant devices gave 88% mortality in a space of 1.73 m(3). Cassia oil applied as sprays or in fumigant devices appears to provide effective protection of humans from house dust mites.

Animals↗
PubMed1995

Distribution of Dermatophagoides mite (Acari: Pyroglyphidae) antigens in homes of allergic patients in Japan.

Dust samples collected in 61 homes of patients with mite allergies and 11 homes of non-allergic people as controls were examined for antigen levels of Dermatophagoides farinae Hughes and Dermatophagoides pteronyssinus (Trouessart) to reveal the current distribution of allergenic mites in homes in Japan. Patient homes had higher antigen levels than control homes in comforters and pillows but not in futons, carpets, tatamis and wooden floors. Samples with antigen levels of > or = 10 micrograms m-2 were more frequent in and around summer (approximately April-October) than other seasons of the year in most materials and the differences between patient and control homes in comforters and pillows observed in yearly totals was also observed during this period. Wooden structures showed higher antigen levels than concrete structures in comforters, futons, pillows, carpets and tatamis in patient homes. Mite contamination in patient homes in relation to environmental factors was discussed.

Adult↗
PubMed1987

Effects of temperature and relative humidity on development times and mortality of eggs from laboratory and wild populations of the European house-dust mite Dermatophagoides pteronyssinus (Acari: Pyroglyphidae).

As part of a study on passive physical control of house-dust mites, a total of 6000 eggs from a population of Dermatophagoides pteronyssinus (Trouessart, 1897) from 17-year-old laboratory cultures were incubated at 60 temperature and relative humidity combinations between 10-35 degrees C and 55-100% RH. Eggs hatched at every combination, although mortality and development time increased between 10-20 degrees C and 30-35 degrees C and below 65% RH. Optimum conditions were 35 degrees C and 80-85% RH. In temperate dry conditions, eggs from a wild population were found to be more resistant to mortality: they developed faster, with 7 times lower mortality than eggs from the laboratory population. This may have been because the laboratory population had become acclimated to the constant near-optimum conditions at which it was kept. Therefore it has been suggested that where laboratory cultures have been used in studies relating to passive physical control, caution should be taken in applying the conclusions to wild populations in the natural house-dust environment.

Animals↗
PubMed1990

House-dust mite (Pyroglyphidae) populations in mattresses, and their control by electric blankets.

A reduction in house-dust-mite populations of 19-84% in beds in regular use could be achieved by heating the mattresses with electric blankets, when the beds were not being slept on. The effect of the heating treatment on the temperature and relative humidity inside the mattress is discussed. House-dust mites in the heated portions of the mattress migrated deeper inside the mattress to a depth of 3.5-5.0 cm. Evidence was also found that house-dust mites in non-heated mattresses do not only live near the surface, but that they are also present deep inside the mattress.

Animals↗
PubMed1990

Effect of heat treatments on the house-dust mites Dermatophagoides pteronyssinus and D. farinae (Acari: Pyroglyphidae) in a mattress-like polyurethane foam block.

The behaviour and survival of the house-dust mites Dermatophagoides pteronyssinus and D. farinae were studied under laboratory conditions in a mattress-like polyurethane foam block that was heated by an electric blanket. Mites obtained from a laboratory culture were introduced into the foam block which was sliced into seven horizontal layers and covered with an electric blanket. Measurements of temperature and relative humidity were taken between the layers and the number of living mites was established using the heat-escape method.

Animals↗
PubMed1992

Ultrastructure of the reproductive system of the house dust mites Dermatophagoides farinae and D. pteronyssinus (Acari, Pyroglyphidae) with remarks on spermatogenesis and oogenesis.

Several parts of the reproductive system of both sexes of Dermatophagoides farinae and D. pteronyssinus are investigated and compared by light-, scanning electron-, and transmission electron microscopy. New techniques have been employed for scanning of the internal structures of these mites. The male reproductive system consists of unpaired testis, paired vasa deferentia, an accessory gland, ejaculatory duct, and copulatory organ. The female reproductive system consists of bursa copulatrix, ductus bursae, receptaculum seminis, paired ducti receptaculi, ovaries, oviducts, one chorion gland, ovipositor, and oviporus. Testis as well as ovaries are characterized by syncytia of nutritional function. The specifics of spermatogenesis are discussed in connection with sperm transfer. Similarities between the construction of the ovaries and oogenesis in astigmatic mites and telotrophic meroistic ovaries in insects are discussed.

Animals↗
PubMed1991

A review of the biology and allergenicity of the house-dust mite Euroglyphus maynei (Acari: Pyroglyphidae) [corrected].

Euroglyphus maynei is a commonly occurring mite species in house dust throughout the world, but studies of its biology and allergenicity have been relatively scarce because it is difficult to culture, and because species of the genus Dermatophagoides have attracted most attention of research workers. Euroglyphus maynei has been increasingly recognized as an important source of mite-derived allergens to which patients with house-dust mite allergy are exposed. There is a need for knowledge of its biology and allergenicity, in order to be able to grow it in vitro, and to establish whether or not it produces any unique allergens which do not cross-react with those of Dermatophagoides spp. and which may be of clinical significance. This article reviews published and unpublished data on taxonomy and identification, geographical and habitat distribution, seasonal population fluctuations, life-history and the effects of temperature and humidity, culture techniques and allergenicity of E. maynei.

Animals↗
PubMed1987

Control of house-dust mites (Pyroglyphidae) with home disinfectants.

Chemical disinfectants and biocidal preparations used in households were tested in the laboratory for their ability to kill the house-dust mite Dermatophagoides farinae. Batches of ten specimens were soaked in aqueous solutions or suspensions containing 0.0, 0.1, 0.3, 1.0, 3.0 and 10.0% (by volume) of the test preparations. Direct effect was tested without food. Population effect was tested with food added. The results showed a high mortality with all preparations except for a regular carpet cleaner (containing detergents) and natamycin (a fungicide). Nevertheless, not all tested preparations are practical in the home environment. Best results in homes were obtained with a carpet cleaning solution which incorporates an acaricide (benzylbenzoate). This particular preparation has an outstanding acaricidal efficacy and can easily and routinely be used by the householder. The degree of cleanliness in the household is a measure of the number of house-dust mites and their allergens.

Allergens↗
PubMed1987

Differences in development time, mortality and water loss between eggs from laboratory and wild populations of Dermatophagoides pteronyssinus (Trouessart, 1897) (Acari: Pyroglyphidae).

A total of four microcultures of adults of Dermatophagoides pteronyssinus, two each from laboratory and wild populations, were fed on separate diets of house dust and yeast granules. A total of 35 eggs of known age from each of the four microcultures were harvested and incubated at 15 degrees C, 60% RH for 16 h/day and 30 degrees C, 75% RH for 8 h/day to simulate diurnal microclimatic fluctuations in a bed. Eggs from females fed on yeast were larger and underwent more rapid rates of water loss, estimated by measurements of reduction in visible surface area (VSA), than eggs from females fed on house dust. There were no significant differences in mean egg development time between the four microcultures (range 6.0-6.88 days). Mortality of the eggs was as follows: from laboratory females fed on yeast, 31.4%; laboratory females fed on house dust, 11.5%; wild females fed on yeast, 2.9%; wild females fed on house dust, 0%. Thus diet and egg size at oviposition had no effect on mortality. Since the microclimates at which eggs from both populations were oviposited and incubated were identical, it is hypothesized that mortality was higher in eggs from laboratory cultures because the mites had become acclimated to the optimal conditions at which they had been kept and were less able to withstand the diurnal fluctuations in microclimate, similar to those imposed upon wild mites in their natural habitats.

Analysis of Variance↗
PubMed2006

A simple model for predicting the effect of hygrothermal conditions on populations of house dust mite Dermatophagoides pteronyssinus (Acari: Pyroglyphidae).

A simple mite population index (MPI) model is presented which predicts the effect on house dust mite populations of any combination of temperature and relative humidity (RH). For each combination, the output is an index, or multiplication factor, such that 1.1 indicates 10% population growth and 0.9 indicates 10% population decline. To provide data for the model, laboratory experiments have been carried out using lab cultures of Dermatophagoides pteronyssinus. The population change was observed for mites held in steady-state conditions at different combinations of temperature and RH over 21 days. From the results, a best-fit equation has been derived which forms the basis of the MPI model. The results also enable a new term to be defined: the Population Equilibrium Humidity, PEH, the RH for a given temperature at which house dust mite populations neither grow nor decline. It is similar to Critical Equilibrium Humidity, the RH below which house dust mites are unable to maintain water balance, but relates to a population of mites (rather than a physiological phenomenon) and is more able to take account of the observed effects of extremes of temperature and RH. Compared with previous population models, the MPI model is potentially more accurate and comprehensive. It can be combined with other simple models (described in previous papers), such as BED, which simulates the average hygrothermal conditions in a bed, given room conditions, and Condensation Targeter II, which simulates room conditions given a range of easily obtainable inputs for climate, house type and occupant characteristics. In this way it is now possible, for any individual dwelling, to assess the most effective means of controlling mite populations by environmental means, such as by improving standards of ventilation and insulation, or by modifying the occupant behaviour that affects the hygrothermal environment within a dwelling. Although the MPI model requires further development and validation, it has already proved useful for understanding more clearly how the different hygrothermal conditions found in beds and bedrooms can affect mite populations. It has also demonstrated that there is considerable scope for controlling mites by environmental means in cold winter climates such as the UK.

Animals↗
PubMed2002

Acaricidal activity of butylidenephthalide identified in Cnidium officinale rhizome against dermatophagoides farinae and dermatophagoides pteronyssinus (Acari: Pyroglyphidae).

The acaricidal activity of materials derived from the rhizome of Cnidium officinale against adults of Dermatophagoides farinae and Dermatophagoides pteronyssinus was examined using direct contact application and fumigation methods and compared with that of benzyl benzoate and N,N-diethyl-m-toluamide (DEET). The active constituent of the Cnidium rhizome was identified as butylidenephthalide by spectroscopic analyses. Responses varied with dose. On the basis of 24-h LD(50) values, the acaricidal activity of butylidenephthalide (6.77 microg/cm(2)) against D. farinae adults was comparable to that of benzyl benzoate (8.54 microg/cm(2)). Very low activity was observed with DEET (37.59 microg/cm(2)). Against D. pteronyssinus adults, butylidenephthalide (6.46 microg/cm(2)) and benzyl benzoate (6.68 microg/cm(2)) were equitoxic. DEET (17.98 microg/cm(2)) was relatively inactive. The typical poisoning symptom of butylidenephthalide was lethargy of treated mites, leading to death without knockdown, whereas benzyl benzoate and DEET caused death following uncoordinated behavior. In a fumigation test with both mite species, butylidenephthalide was much more effective in closed containers than open ones. Naturally occurring C. officinale rhizome-derived materials merit further study as potential house dust mite control agents or lead compounds.

Animals↗