Chromosome centers defined and sequenced for model plant
...eiosis to stick together, forming a tetrad of four pollen grains. This allows scientists, using genetic markers, to monitor how the original five pairs of chromosomes shuffle the deck of genetic information through one replication and two divisions to form the four cells of a tetrad. The researchers stud...NYU researchers find that genetically engineered corn releases insecticidal toxin into soil
...it was shown that the toxin is also present in the pollen of Bt corn and that when the pollen was placed on the leaves of milkweed, it killed monarch butterflies that ate the contaminated leaves...Genetic extremism overstates risks
...releases of the new genes into the environment via pollen and seeds. Because they result from insertion of specific, intensively studied genes, most of the risks from this genetic manipulation can be carefully studied, isolated, and controlled so they can be anticipated in advance and reasonable decisions...How a gene tells plant to reject its own pollen
... could tell the difference between the plant's own pollen and that from other plants. Now, Cornell Univers...a gene that tells the stigma-based receptors which pollen to accept or reject. Plants have several ways to reproduce. Some self-pollinate, others cross-pol...USGS studies wildfire ecology in the western United States
...on of Northern Arizona University, he is reviewing pollen and charcoal deposits in soil cores extracted from several northern New Mexico bogs. The cores contain a record of sediment deposition going back over 10,000 years. In one Jemez sample that has already been analyzed, Allen says, the contrast between ...Genetic engineered crop studies questioned
...ere fed milkweed that had the highest levels of Bt pollen thatwould be encountered in the field. Shelton an...d Roush note that it is unlikelythat these high Bt pollen levels would be encountered by the insects in thefield, and they say that "few entomologists or weed...Team of 200 scientists presents new research that reveals full 'tree of life' for plants
...angiosperms came from. The primitive modeof moving pollen is thought to be wind, and then the standard story is that theflowering plants explosively radiated into many types once they beganassociating and co-evolving with insects. However, there are indications fromfossils that some non-flowering plants wer...Botanical evidence indicates "Shroud of Turin" originated in Jerusalem area before 8th century
ST. LOUIS, MO. August 2, 1999 -An analysis of pollen grains and plant imagesplaces the origin of the "S...of the Shroud based on a comprehensive analysis of pollen taken from theShroud and plant images associated with the Shroud. The review of plant andpollen evi...When is a pollinator not a pollinator? Tales from an insect crime scene...
...ination in the gilia occurs onlythrough interplant pollen transfer. For a plant to be successfully pollinated,the pollen of one plant must be transferred to the stigma of another, where itcan fertilize the ovule and form ...Engineered Corn Can Kill Monarch Butterflies
...ainst corn pests, has an unwantedside effect: Its pollen kills monarch butterfly larvae in laboratory tests...endotoxin from the bacterium genes. When thiscorn pollen is dispersed by the wind, it lands on other plants, includingmilkweed, the exclusive food of monarch......ints and remnants of plantsand the accumulation of pollen grains - are not preserved in the harsh outbackenvironment. A report in the May 14 issue of Science, describing a novel approach toreconstructing paleovegetation, presents the first continuous vegetation recordfrom the Australian interior extending b...Sandia, University Of Montana Researchers Try Training Bees To Find Buried Landmines
... about their dailybusiness -- gathering nectar and pollen and taking it backto the hive -- may one day help ...d pollen, theyattract particles of dust, soil, and pollen to their fuzzy,statically charged bodies and bring samples back to thehive. In doing so they provide...Bees The Buzz In Landmine Detection
...l bees. For example, as a bee leaves for a day of pollen hunting, itwill fly out of the hive and trigger the reader. The reader scans the tag oneach bee, then sends the bee's identification code, direction of flight and thetime to a modem. The modem downloads the data to a central computer. Thisprocess ...Ancient Volcanic Cataclysms Discovered In The Indian Ocean
...f Geophysics. "Wood fragments, a seed, spores and pollen recoveredin 90-million-year-old sediment from the central Kerguelen Plateau, justsoutheast of Heard Island, unambiguously indicates that this region was abovesea level." A spectacular result was finding uniquely continental rocks in aconglome...Did Fur Trappers Trigger Landscape Changes?
...sh's theory is supported by her discovery of sedge pollen in the oldestportions ofsome of the first sediment...es where moisture is likely tohave preservedseeds, pollen and other fossilized material. With the tool, the researchers canextract a cylinder-shaped sediment ......ural levels about 6,000 years ago. (Treeand cereal pollen records also suggest that people were beginning to clearforested lands and grow crops at this time.) The record also shows largefluctuations that match up very well with historical events such as the rise andfall of the Roman Empire, and onset of the...Genetically-Altered Crops Can Produce Tough, Hard-To-Kill Weeds
...act, previous studies have shown that oilseed rape pollen can reachweeds nearly one mile away. "If f... nucleus. The DNA from the nucleus gets into every pollen grain of a plant, and willtravel far and wide on the wind, or hitch a ride with pollinators such as ...Duke Studies Show U.S. Central Plains Vulnerable To Global Warming
...e Central Plains, Clark and hiscolleagues analyzed pollen and fire-produced charcoal laid down in sediments inlakes in western Montana, the Dakotas, Nebraska, Minnesota and Wisconsin. Theiranalyses revealed the plants that dominated the region at various times duringthe period, as well as the incidence of f...A 300-Million-Year Old Twosome: The Cycad And Its Pollinator
...llination -- the transfer of the sperm-cell-loaded pollen from themale structure to the female structure for germination -- involves separate maleand female cycad plants with reproductive structures called conesproduced when both plants reach maturity. The pollen-laden male cone differs inshape, size, and ...Allergy And Asthma-Exaceberating Mites, Molds And Pollens On The Rise Due To El Niño . . . La Niña
...lted in rapid plant growth which leads to elevated pollen counts. Inaddition, when the weather is bad, peopl... be to pet dander, while to othersit may be to the pollen of specific trees such as olive, walnut or ash. Contraryto popular belief, flower pollens are very r...