Pollen concentrations

This article describes in detail an advanced statistical method, the artificial neural network, and the possibilities for its application in aerobiological analyses. The study and models involve the concentration of fungal spores in the air and their relationship with various biological and environmental factors. The author hopes that this work will contribute to a wider use of this method not only in the study of spores but also the concentration of pollen grains.

7p tudichquannguyet 29-11-2021 16 0   Download

Airborne pollen grains in Aydın, an important city for agriculture and tourism in the western part of Turkey, were studied for 2 years (2014 and 2015) using the volumetric method. During a 2-year study conducted in the city center, an average of 19,226 pollen grains belonging to 46 taxa were detected. Among these detected taxa, 29 (average 73.97%) belonged to arboreal plants and 17 (average 24.95%) to nonarboreal plants. The highest pollen concentrations belonged to Olea europaea (21.02%), Quercus (15.23%), Poaceae (11.89%), Pinaceae (11.47%), Cupressaceae/Taxaceae (11.11%), Platanus(4.

13p tudichquannguyet 29-11-2021 6 1   Download

This study researched atmospheric pollen from Mersin Province using the volumetric method between in 2016 and 2017. The daily, weekly, monthly, and annual distribution of the pollen obtained during the study was identified. The relationship between pollen and meteorological factors was researched using Spearman’s rho analysis. During the two-year study, 32,336 pollen grains/m3 from 40 different taxa [22 trees, 1 grass (Poaceae), and 17 other weeds] were identified. Of the total pollen, 82% belonged to trees, 6.8% to grasses, 11% to other weeds, and unidentified taxa accounted for 0.2%.

13p tudichquannguyet 29-11-2021 5 0   Download

In this study, we compared the pollen quantity, viability and in vitro pollen germination of M1 and M2 type flowers of nine longan genotypes. Acetocarmine, 2, 3, 5-triphenyl tetrazolium chloride, 2, 5-diphenyl monotetrazolium bromide and aniline blue-lectophenol staining methods were used for pollen viability assessment while different concentrations of sucrose, boric acid (H3BO3) and agar were used for in vitro pollen germination test through hanging drop technique.

9p quenchua8 29-09-2020 11 0   Download

In M1 generation, the germination percentage was reduced due to various mutagenic treatments under field as well as laboratory conditions. Reduction in germination was found maximum in higher dose and/or concentration of the mutagens. The progressive decreased in seedling growth viz. root and shoot length with corresponding increase in dose or concentration of gamma rays, ethyl methane sulphonate and their combinations was observed in M1 generation.

4p angicungduoc4 26-04-2020 13 0   Download

The present study aimed at verifying the usefulness of dietary 2.5% bee-pollen (BP) or propolis (PROP) to overcome the genotoxic and endocrine disruptive effects of malathion polluted water in Oreochromis niloticus (O. niloticus). The acute toxicity test was conducted in O. niloticus in various concentrations (0–8 ppm); mortality rate was assessed daily for 96 h. The 96 h-LC50 was 5 ppm and therefore 1/5 of the median lethal concentration (1 ppm) was used for chronic toxicity assessment.

14p kethamoi1 17-11-2019 14 1   Download

Atmospheric pollen was collected by a Burkard Volumetric 7-Day spore trap in Konya, Turkey, in 2008. In the present study, the pollen concentration is presented in relation to meteorological parameters (mean temperature, relative humidity, rainfall, and wind speed). Pollen grains of 35 taxa were identified.

14p vi4mua 24-02-2019 9 0   Download

Knowledge of the types of atmospheric pollen and their concentrations in a particular area is critical for evaluating air quality and allergen exposure. This study was carried out to determine the pollen diversity and daily, monthly, and annual concentrations in Gümüşhane, whose relationships were then sought with the meteorological factors in the atmosphere of Gümüşhane.

14p caplock2711 21-02-2019 24 1   Download

This study was carried out to determine the effects of heavy metals (Ni, Fe, Pb, Co, Cd, Hg, Al, Zn and Cu) on pollen germination and pollen tube length in the tobacco plant (Nicotiana tabacum L.) cv. Karaba¤lar. The results showed that enhanced concentrations of heavy metals, except Fe, decreased the pollen germination rates and the pollen tube lengths.

5p vitamix 19-02-2019 29 0   Download

001: Chọn từ có phần gạch chân phát âm khác với ba từ còn lại từ 1 đến {} A. penalty B. cap C. scuba-diving D. gorilla 002: A. wildlife B. goalies C. biologist D. digest 003: Chọn từ có trong âm khác với ba từ còn lại từ 1 đến {} A. expedition B. intervention C. inhabitant D. optimistic 004: A. employment B. remember C. concentrate D. position 005: A. polite B. pollen C. police D. pollute 006: Chọn từ hoặc nhóm từ đúng nhất để hoàn thành các câu sau từ 1 đến {} Thousands...

6p rrtrungrr11 27-03-2013 312 34   Download

It is not yet clear how exposure to low ambient concentrations of particulates might produce the health effects observed in epidemiological studies and whether certain attributes of particles may be more closely associated to these health effects. The characteristics of particles that are being investigated for their roles in causing health effects include metal content, particle size, and particles as carriers of other toxic compounds (such as gases or biological toxins from bacteria and pollens etc.).

71p saimatkhauroi 01-02-2013 42 4   Download