From each pollen grain, a pollen tube grows out attempting to travel into the ovary by creating a path. The vegetative and generative nuclei of the pollen grain pass into its respective pollen tube. Full article >>>
This less appreciated mechanism is the basis for differential fertilization which includes spermselection as opposed to pollen selection in plants. This should not be confused with sperm competition / pollen tube competition (link to a book ... Full article >>>
(Date:9/5/2008)... Mich.---Captive breeding colonies of a critically...e dwindled from tens of millions to a few thousand...tion, a University of Michigan analysis shows. , ...d in Pakistan and India, is crucial, but political...ys lead author Jeff A. Johnson. , The study was ...
(Date:9/5/2008)... release is available in French and Spanish . ...t of Nutrition and Bromatology and Department of... have carried out a study in which they have revea...niversity population who follows Ramadan. , Acco...e macronutrient consumption levels are not appropr...
(Date:9/4/2008)...- There are numerous plant-parasitic nematodes in ...the largest part of an estimated $157 billion in a...are small worms that burrow into plant roots and f...ty researchers have contributed to the release of ...e nematodes: Meloidogyne incognita -- the southe...
(Date:9/4/2008)...Sept. 4, 2008 As the anniversary of the September...ety (ACS) has issued a new podcast describing an a...y and national security. The podcast is the sixth...mistry Solutions )series. , With new episodes po...nting problems facing society in the 21st Century,...
...od for manipulating macromolecules has been develo...t Urbana-Champaign. The technique uses double-stra.... , In previous DNA nanotechnology efforts, duple...ct geometrical objects in three dimensions. Instea...researchers are using DNA to control the folding a...
...usty, treeless expanse of Chile,s Atacama Desert i... and that,s why Alison Skelley and Richard Mathies...is month. , The University of California, Berkele...er (MOA) they,d built could detect life in that cr...some day of detecting life on the planet Mars. , I...
...s from China and the United States have found evid...old fossils from South China. The previous earlies...scovered in Scotland. The discovery also adds to t...estions about lichen evolution. , Xunlai Yuan, a p...y and Palaeontology; Shuhai Xiao, assistant profes...
...zens of interceptions at U.S. ports, a public enem...ive in Fulton County, N.Y., and identified by a Co... the only one of its kind ever discovered in the e...specimen of Sirex noctilio Fabricius, an Old World...use the invasive insect species has devastated up ...