If you would like to submit feedback regarding any Health Tags direct all correspondence to:

Pollen.com is the revolutionary new online resource that provides you with essential tools to do just that. With reliable up-to-the-minute allergy forecasts that show the upcoming airborne allergen conditions in your local environment as well as the weather forecast, Pollen.com prepares you for the day by offering you all the facts - at a glance! This is information that can help you maximize the quality of your life, and perhaps minimize visits to your physician or allergy specialist., delicious.com

Pollen Count Dallas Plano Texas Ragweed Mountain Cedar Elm Fungus Mold Allergy Testing & Treatment Center Dallas Fort Worth Plano Texas Ozone, delicious.com

Forest Ecology and Management, Vol. 197, No. 1-3. (August 2004), pp. 21-38.P Smouse, citeulike.org

Science, Vol. 320, No. 5883. (20 June 2008), pp. 1622-1625.The response of the Greenland ice sheet to global warming is a source of concern notably because of its potential contribution to changes in the sea level. We demonstrated the natural vulnerability of the ice sheet by using pollen records from marine sediment off southwest Greenland that indicate important changes of the vegetation in Greenland over the past million years. The vegetation that developed over southern Greenland during the last interglacial period is consistent with model experiments, suggesting a reduced volume of the Greenland ice sheet. Abundant spruce pollen indicates that boreal coniferous forest developed some 400,000 years ago during the "warm" interval of marine isotope stage 11, providing a time frame for the development and decline of boreal ecosystems over a nearly ice-free Greenland. 10.1126/science.1153929Anne de Vernal, Claude Hillaire-Marcel, citeulike.org

Am. J. Bot., Vol. 92, No. 2. (1 February 2005), pp. 252-261.California Valley oak (Quercus lobata), one of the state's most distinctive oak species, has experienced serious demographic attrition since the 19th century, due to human activities. Recent estimates of pollen dispersal suggest a small reproductive neighborhood. Whether small neighborhood size is a recent phenomenon, a consequence of reduced gene flow caused by demographic changes, or whether it has been historically restricted, remains unclear. To examine this question, we have characterized the spatial genetic structure of N = 191 Q. lobata individuals, spread over an area of 230 ha, using eight microsatellite loci. The observed autocorrelogram suggests an historical standard deviation of gene flow distance of about 350 m per generation, higher than contemporary pollen dispersal estimates. To determine whether our estimates were affected by strong prevailing winds from the west-northwest, we developed and utilized a novel anisotropic autocorrelation analysis. We detected no more than a hint of anisotropy, and we concluded that adult spatial structure is indicative of strong historical signature of "isolation by distance." This historical estimate provides a useful reference value against which to gauge the future gene flow consequences of ongoing anthropogenic disturbance. 10.3732/ajb.92.2.252Cyril Dutech, Victoria Sork, Andrew Irwin, Peter Smouse, Frank Davis, citeulike.org

Like Astralgus, it also satisfies the people with a sweet tooth. As a result, blood circulation system in the body gets highly effected. Quite a few of these are diabetes, high blood pressure, kidney problems, cardiovascular diseases, stroke cancer, ga..., delicious.com

Ann Bot (30 June 2008), mcn109.Background and AimsInvasive plants are potential agents of disruption in plant-pollinator interactions. They may affect pollinator visitation rates to native plants and modify the plant-pollinator interaction network. However, there is little information about the extent to which invasive pollen is incorporated into the pollination network and about the rates of invasive pollen deposition on the stigmas of native plants. MethodsThe degree of pollinator sharing between the invasive plant Carpobrotus affine acinaciformis and the main co-flowering native plants was tested in a Mediterranean coastal shrubland. Pollen loads were identified from the bodies of the ten most common pollinator species and stigmatic pollen deposition in the five most common native plant species. Key ResultsIt was found that pollinators visited Carpobrotus extensively. Seventy-three per cent of pollinator specimens collected on native plants carried Carpobrotus pollen. On average 23 % of the pollen on the bodies of pollinators visiting native plants was Carpobrotus. However, most of the pollen found on the body of pollinators belonged to the species on which they were collected. Similarly, most pollen on native plant stigmas was conspecific. Invasive pollen was present on native plant stigmas, but in low quantity. Conclusions Carpobrotusis highly integrated in the pollen transport network. However, the plant-pollination network in the invaded community seems to be sufficiently robust to withstand the impacts of the presence of alien pollen on native plant pollination, as shown by the low levels of heterospecific pollen deposition on native stigmas. Several mechanisms are discussed for the low invasive pollen deposition on native stigmas. 10.1093/aob/mcn109Ignasi Bartomeus, Jordi Bosch, Montserrat Vila, citeulike.org

Computer Networks, Vol. 35, No. 4. (March 2001), pp. 429-442.Natalie Glance, Dave Snowdon, Jean-Luc Meunier, citeulike.org

Sexual Plant Reproduction, Vol. 21, No. 3. (2008), pp. 169-181.Abstract  The presence of both calcium (Ca2+) and proton (H+) apical gradients is necessary for polarized cell elongation to occur in pollen tubes. So far, most of these studies have been carried out in lily pollen tubes, using chemical probes. Yet, lily is a refractory model for molecular genetics, with no easy protocol available for the construction of stable transgenic lines. Tobacco, however, is well suited for both transformation and cell biology, with sexual organs that are accessible, easy to handle and visualize. Pollen tubes are in an ideal size range for sub-cellular imaging analyses using modern microscopy techniques. Ion homeostasis in tobacco pollen tubes has not been precisely characterized so far. Here, we characterize the H+ and Ca2+ spatial and temporal patterns in tobacco pollen tubes by the use of two fluorescent genetic probes, pHluorin and the YC3.1 yellow CaMeleon, and direct measurement of extracellular flux by ion-sensitive vibrating probes. A distinct 0.4 pH unit acidic gradient was found to stretch from the tip up to 40 ?m into the tube shank. This gradient intensity displayed 1?4 min period oscillations and is reduced in the non-growing phase of an oscillatory cycle. Furthermore, sub-membrane and sub-apical alkaline domains were detected. Extracellular H+ fluxes oscillated between 10 and 40 pmol cm?2 s?1. Fourier and continuous wavelet analyses showed tubes with one or two major oscillatory components in both extra and intracellular H+ oscillations. Cytosolic Ca2+ was imaged by confocal microscopy, showing a V-shaped 40 ?m gradient extending from the tip, from 0.2 to 1.0 ?M, which oscillates with a 1?4 min period, but with only one major oscillatory component. Extracellular Ca2+ fluxes oscillate in most pollen tubes, between 2 and 50 pmol cm?2 min?1 and, like in H+, with one or two major oscillatory peaks. A combination of confocal and widefield microscopy showed that H+ and Ca2+ displayed different patterns and shapes inside the cell, sometimes suggesting a structurally complementary role for these 2 second messengers in the growth process. These data suggest that fluxes at the apex of the pollen tube are directly responsible for establishment and maintenance of the gradient.Erwan Michard, Pedro Dias, José Feijó, citeulike.org