PollenAir pollutionAllergyAir pollution affects pollen allergy in at least three ways: through its direct effects on human health, through changes in plant health, and through the direct alteration of the allergenic pollen grain. This literature review addresses the latter point: the chemical or ...
3 : Grain de pollen bisaccade, échantillon Ka 4, lame L1, EF U35/1. 4 : Spore, échantillon Ka 5, lame L1, EF C47. (Color online). The scale bar in Fig. 2 represents 40 μm for all specimens. 1: Achritarch, sample Ka 20, slide L1, EF H25; Sample Ka 20, slide L1, ...
L'échange des gènes est limité à la fois par la défaillance partielle des graines et l'infertilité des hybrides (VALENTINE, 1961) ; mais les hybrides se produisent naturellement et sont bien connus. Les espèces du genre Quercus, en Europe, nous four- nissent un autre bon exemple,...
Mille, P. (2004). Inventaire des différents types de tour utilisés en Europe occidentale, des origines à l’époque médiévale, d’après la documentation textuelle, archéologique et iconographique. In M. Feugère & Gerold (Eds.), Le Tournage Des Origines à l’An Mil, Actes Du Co...
SUMMARY Sunflower improvement by conventional breeding is severely restricted by the availability of a rather limited gene pool owing to natural incompatibilities, even between related species, and by the time scale of most breeding programs. Therefore,
Since the first indications by Sands and coworkers [81], the role of biological particles in cloud formation (i.e. pollen, fungal spores, and bacteria can be activated as CCNs) precipitations, ecosystem interactions, has been the subject of an increasing number of studies fully quoted in [...
Raising growth of date palm cv. Bartomouda plantlets with date palm pollen grain extract and amino acids compound under greenhouse conditionDarwesh RasmiaS.S ElBanna AAGehan Mohamad Y
R47-3 ; (C–D) en microscopie électronique à balayage, lamelle n° 1 ; D : détail de la sculpture crotonoïde du grain photographié en C. Fig. 5. Biorecord Superret-croton (equivalent to Stellatopollis hughesii Penny, 1986): (A–B) light microscopy; A: sample BER-7, slide ...
‘Charmoy’ in the Blanzy–Montceau-les-Mines basin), the polyplicate pollen grainVittatinasp. is significantly present (about 20%). This may imply preservation conditions that are favoured in fluvial environment, or an ecological preference of theVittatina-producing plant for near-stream ...