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排序方式: 共有140条查询结果,搜索用时 15 毫秒
1.
2.
The qualitative fungal composition of Turin 's atmospheric environment was surveyed, carrying out a twelve-month study and collecting with a single stage volumetric sieve sampler on Dermasel agar supplemented with 0.4 g l–1 cycloheximide and 0.05 g l–1 chloramphenicol. We isolated 165 species and 2 varieties of mesophilic fungi from 58 genera and 26 thermotolerant species from 12 genera. Penicillium, Aspergillus, Acremonium, Chrysosporium, Scopulariopsis, Malbranchea, Paecilomyces, Phialophora and Cladosporium were in sequence the genera most rich in mesophilic species; Aspergillus, Penicillium, Chrysosporium and Scopulariopsis the most rich in thermotolerant species. Many of the species isolated are rarely or never recorded in the atmospheric environment. Cycloheximide can thus be said to select among airborne fungi, giving a characteristic picture.Abbreviation CH
Cycloheximide
- cfu
colony forming unit 相似文献
3.
Masahiro Sakaguchi Sakae Inouye Yuichi Takahashi Susumu Kutagiri Hiroshi Yasueda 《Aerobiologia》1995,11(4):265-268
We examined the kinetics of airborne levels of mite allergen particles in a house by combined use of an indoor Burkard air
sampler and immunoblotting. Airborne mite allergens collected on the Burkard sampling tape were transferred onto a nitrocellulose
membrane, reacted with mouse monoclonal anti-mite allergen (Der pI) antibody, then treated with alkaline phosphatase conjugated anti-mouse IgG. Finally, the blotted allergen on the membrane
was reacted with BCIP/NBT phosphatase, and purple spots visible by the naked eye were produced. The shape of the spots was
observed under a microscope, and the spot area was measured by an image processor. This technique might be useful for analyzing
the behavior of airborne allergen particles in indoor environments. 相似文献
4.
Consuelo Díaz de la Guardia Roberto Alonso Francisca Alba Francisco Valle 《Aerobiologia》1995,11(1):47-50
We have carried out a study on the annual and daily pollen concentrations from Gramineae over four consecutive years in the atmosphere of Granada (Spain). Samples of pollen grains were collected by the volumetric method with the aid of a Burkard sporetrap. Gramineae, according both to their high sensitizing capacity and to data from allergologists, are responsible for many pollinoses diagnosed in this area. In this work, daily pollen levels from April to July are monitored and the variations identified are interpreted in relation to meteorological conditions. Results indicated that the highest airborne concentrations of Gramineae pollen were found in May and June, although the beginning and intensity of pollination have been variable during these 4 years. 相似文献
5.
The present article deals with the efficacy of seed hairs of poplar trees (Populus spp.) as a potent natural airborne pollen trap. Different species of Populus are commonly found planted along the streets in the cities of North China. The seed hairs and pericarp of poplar trees were collected from the trees and on the ground in Beijing Botanical Garden of Chinese Academy of Sciences and around Miyun Reservoir during May 2005 for pollen analysis. Different pollen spectra are recorded from different samples and are characterised by dominant occurrence of pollen grains of arboreal and anemophilous plants. In addition, pollen grains of non‐arboreal plants including grasses are also found trapped. Among the 46 trapped pollen grains, 26 are known to be allergenic. This study suggests that poplar seed hairs possibly make people feel uncomfortable due to the presence of allergenic pollen trapped in the hairs. 相似文献
6.
Leticia Ruiz Garcia Consuelo Díaz de la Guardia Juan Francisco Mota 《Aerobiologia》1998,14(2-3):281-284
The first results are presented of an aerobiological analysis of the atmosphere of the town of Almería, carried out between
November 1995 and October 1996. A Lanzoni volumetric spore trap was used for sample collection. The composition and seasonal
evolution of the pollen spectrum were determined over a 1-year period in relation to the vegetation and climatic conditions
of the study area. Twenty-six pollen types were identified as accounting for >0.05% of the total pollen collected. The main
sources of airborne pollen were Palmae (17.76%),Olea (16.10%), Chenopodiaceae/Amaranthaceae (13.99%), Urticaceae (10.18%) and Poaceae (8.64%). The annual pollen variation presented
a period of maximum emission from March to June, with a subsequent, less intensive period from August to November. The minimum
pollen values were obtained from December to February. The highest concentrations occurred in May, which was also the month
which presented the highest pollen diversity, whereas the lowest values were observed in January. 相似文献
7.
The digital airborne sensor, CASI (Compact Airborne Spectrographic Imager) has considerable potential for mapping marine
habitats. Here we present an account of one of the first coral reef applications. The CASI was flown over reefs of the Turks
and Caicos Islands (British West Indies) and set to view 1 m pixels in 8 spectral bands. In addition, reef habitats were sampled
in situ by visual assessment of percent cover in 1 m quadrats. Seagrass standing crop was assessed using a calibrated visual scale.
Benthic habitats were classified using hierarchical cluster and similarity percentage analyses of the field survey data. Two
levels of habitat discrimination were assessed: a coarse level (corals, algae, sand, seagrass) and a fine level which included
nine reef habitats. Overall accuracies of CASI-derived habitat maps were 89% and 81% for coarse and fine levels of habitat
discrimination, respectively. Accuracies were greatest once CASI data had been processed to compensate for variations in depth
and edited to take account of generic patterns of reef distribution. These overall accuracies were significantly (P<0.001) better than those obtained from satellite imagery of the same site (Landsat MSS, Landsat TM, SPOT XS, SPOT Pan, merged
Landsat TM/SPOT Pan). Results from CASI were also significantly better than those from interpretation of 1:10 000 colour aerial
photographs of reefs in Anguilla (Sheppard et al. 1995). However, the studies may not have been entirely comparable due to
a disparity in the areas mapped.
Accepted: 26 May 1997 相似文献
8.
The oak processionary moth (Thaumetopoea processionea L.) is found in oak forests in most European countries. The caterpillars bear urticating hairs (setae) as a chemical defence.
These hairs break off and are small enough to become airborne and be transported by the wind. Upon contact with humans the
toxin can cause an allergic reaction that ranges from a skin rash to respiratory distress. In order to measure the terminal
settling velocity of this bioaerosol, we used a small elutriator and tested its functionality with particles of known aerodynamic
diameter. We determined that the mean settling velocity of the setae is about 1 cm/s, corresponding to an aerodynamic diameter
of 19 μm for setae with a diameter of 6 μm and a length of 190 μm. The dispersion of the hairs in the atmosphere for a typical
summer day was calculated by means of an Eulerian model. The results of this calculation revealed that the maximum concentrations
in the atmosphere on a typical summer day reach 20–30% of the concentration found directly at the source. Those maximum concentrations
are reached at a distance from the source that varies between 174 and 562 m, depending on the atmospheric stability and the
settling velocity.
相似文献
Lisa FenkEmail: |
9.
Sandra M. Vergamini Rosa M. Valencia-Barrera Barbara Catarina de Antoni Zoppas Carmen Pérez Morales Delia Fernández-González 《Aerobiologia》2006,22(2):141-148
An aerobiological study has been carried out in the region of Caxias do Sul in southern Brazil. Pollen monitoring was performed from January 1, 2001 through to December 31, 2002. A total of 30,469 pollen grains were collected during this period, and 40 pollen types were identified; of these, 23,389 pollen grains, representing 29 pollen types, originated from tree and shrub taxa. The maximum pollen concentration was registered in August 2001 and October 2002. In the study area, the pollen type Mimosa scabrella (18.8%) was much more abundant than all of the pollen types from tree and shrub taxa, such as: Urticaceae (18.4%), Myrtaceae (10.2%), Cupressaceae (7.7%), Myrsine (4.8%), Sorocea (3.9%), Pinaceae (2.9%), Asteraceae (2.2%) and Ricinus (2.1%). These nine pollen types accounted for the largest pollen concentrations of all the tree and shrub taxa. The pollen types Carya, Melastomataceae, Mimosa scabrella, Myrsine and Sorocea are reported for the first time in an aerobiological study in Brazil. 相似文献
10.