搜索结果: 1-15 共查到“知识库 理学 pollen”相关记录47条 . 查询时间(0.125 秒)
Functional Analysis of Receptor-like Kinases in Pollen-Pistil Interactions in Arabidopsis thaliana
pistil synergids ROS pectin
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2015/1/6
Rac/Rop GTPases are molecular switches in plants that control the growth of polarized cells such as pollen tubes and root hairs, differentiation, development, actin dynamics, production of reactive ox...
EMPOL 1.0: a new parameterization of pollen emission in numerical weather prediction models
pollen emission numerical weather prediction
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2014/12/12
Simulating pollen concentrations with numerical
weather prediction (NWP) systems requires a parameterization for pollen emission.
Regulation of the actin cytoskeleton in the pollen tube
Pollen tube ovule sperm plant sexual reproduction actin cytoskeleton protein
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2014/12/11
Pollen tube growth, the process that transports the sperm cell to the ovule, is fundamental for plant sexual reproduction. The actin cytoskeleton is essential to the process of pollen tube elongation....
Understanding the Links Between Human Health and Climate Change: Agricultural Productivity and Allergenic Pollen Production of Timothy Grass(Phleum pratense L.) Under Future Predicted Levels of Carbon Dioxide and Ozone
Carbon Dioxide Climate Change Grass Pollen Human Health Ozone Phleum pratense
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2014/11/4
The prevalence of allergic disease is expected to increase with climate change. Grasses, which have highly allergenic pollen, are widely distributed across the globe. Changes in production and allerge...
Natural traps of spores and pollen grains from the region surrounding Wenbi Reservoir, Yunnan, China
natural pollen traps Wenbi Reservoir Yunnan China vegetation
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2014/1/16
We did a comparative analysis of pollen and spores from five kinds of natural pollen traps at Wenbi Reservoir, northwest Yunnan, China. The natural traps were the surface soil, ground inhabiting mosse...
Pollen-based biome reconstructions for Latin America at 0, 6000 and 18 000 radiocarbon years ago
Latin America Pollen-based biome
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2009/12/3
The biomisation method is used to reconstruct Latin American vegetation at 6000±500 and 18 000±1000 radiocarbon years before present (14C yr BP) from pollen data. Tests using modern pollen data from 3...
Terrestrial climate variability and seasonality changes in the Mediterranean region between 15 000 and 4000 years BP deduced from marine pollen records
Terrestrial climate marine pollen records seasonality changes
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2009/12/3
Pollen-based climate reconstructions were performed on two high-resolution pollen marines cores from the Alboran and Aegean Seas in order to unravel the climatic variability in the coastal settings of...
Rapid climatic variability in the west Mediterranean during the last 25 000 years from high resolution pollen data
climatic variability High-temporal resolution pollen west Mediterranean
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2009/12/3
High-temporal resolution pollen record from the Alboran Sea ODP Site 976, pollen-based quantitative climate reconstruction and biomisation show that changes of Mediterranean vegetation have been clear...
Central African biomes and forest succession stages derived from modern pollen data and plant functional types
Central African biomes plant functional types forest succession stages
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2009/12/3
New detailed vegetation reconstructions are proposed in Atlantic Central Africa from a modern pollen data set derived from 199 sites (Cameroon, Gabon and Congo) including 131 new sites. In this study...
Late Glacial and Holocene changes in vegetation cover and climate in southern Siberia derived from a 15 kyr long pollen record from Lake Kotokel
Late Glacial vegetation cover Holocene changes
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2009/12/3
In this study a radiocarbon-dated pollen record from Lake Kotokel (52°47´ N, 108°07´ E, 458 m a.s.l.) located in southern Siberia east of Lake Baikal was used to derive quantitative ch...
Climate reconstruction from pollen and δ13C records using inverse vegetation modeling – Implication for past and future climates
Climate reconstruction future climates
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2009/12/3
An improved inverse vegetation model has been designed to better specify both temperature and precipitation estimates from vegetation descriptions. It is based on the BIOME4 vegetation model and uses...
Late Glacial to Holocene environments in the present-day coldest region of the Northern Hemisphere inferred from a pollen record of Lake Billyakh, Verkhoyansk Mts, NE Siberia
Holocene environments Northern Hemisphere coldest region
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2009/12/3
In this study, a radiocarbon-dated pollen record from Lake Billyakh (65°17' N, 126°47' E; 340 m a.s.l.) in the Verkhoyansk Mountains was used to reconstruct vegetation and climate change since about 1...
Millennial-scale climatic variability between 340 000 and 270 000 years ago in SW Europe：evidence from a NW Iberian margin pollen sequence
climatic variability Marine Isotope Stage SW Europe
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2009/12/3
We present a new high-resolution marine pollen record from NW Iberian margin sediments (core MD03-2697) covering the interval between 340 000 and 270 000 years ago, a time period centred on Marine I...
不同贮存温度蜂花粉的可见-近红外光谱鉴别（Application of Visible/Near Infrared Spectroscopy for Discrimination of Bee Pollen under Different Storage Temperature）
可见-近红外光谱技术 蜂花粉 贮存温度
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2009/11/3
利用可见-近红外光谱技术结合最小二乘支持向量机（LS-SVM）对不同贮存温度下的蜂花粉进行鉴别。选择-20、4、15、25和40℃ 5个温度下分别贮存60d后的蜂花粉为研究对象。对原始光谱数据进行平滑和附加散射校正（MSC）的预处理后进行主成分分析，选择4～20个主成分作为输入变量进行LS-SVM建模。模型预测参数比较结果显示，当主成分数取20时模型的预测效果最好，预测相关系数r2p≥0.9919...
A statistical study of Weinmannia pollen trajectories across the Andes
statistical study Weinmannia pollen trajectories Andes
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2010/1/28
Recent airborne pollen records data from Northern Patagonia (San Carlos de Bariloche, Argentina, Lat. 41.1435° S, Long. 71.375° W, 800 m elevation) suggest that pollen transport takes place from the w...