The taxonomy of perennial Sesuvium species in Africa has been poorly investigated until now. Previously five perennial species of Sesuvium were recognised in Africa (S. congense, S. crithmoides, S. mesembryanthemoides, S. portulacastrum, and S. sesuvioides). Based on the differing number of stamens, S. ayresii is accepted here as being distinct from S. portulacastrum. Field observations in Ango...

fractional exhaled nitric oxide (feno) has been suggested as a non-invasive biomarker of airway inflammation, which is increased in atopic subjects. whether sensitization to particular allergens is a predictive factor for increased feno levels is not yet fully understood. we conducted a retrospective cross-sectional study. from october to december in 2015, the medical documents of 127 mild, ste...

Studies were conducted to determine the utility of overseeding endophyte enhanced varieties of perennial ryegrass, Lolium perenne L., into existing stands of Kentucky bluegrass, Poa pratensis L., to manage bluegrass billbug, Sphenophorus parvulus Gyllenhal, larval populations and their damage. Two commercial varieties of endophyte enhanced perennial ryegrass (Repell II and Triple Play) were ove...

In the United States, policy initiatives aimed at increasing sources of renewable energy are advancing bioenergy production, especially in the Midwest region, where agricultural landscapes dominate. While policy directives are focused on renewable fuel production, biodiversity and ecosystem services will be impacted by the land-use changes required to meet production targets. Using data from fi...

Maximum lifespan greatly varies among species, and it is not strictly determined; it can change with species evolution. Clonal growth is a major factor governing maximum lifespan. In the plant kingdom, the maximum lifespans described for clonal and nonclonal plants vary by an order of magnitude, with 43,600 and 5,062 years for Lomatia tasmanica and Pinus longaeva, respectively. Nonclonal perenn...

This study compared the cephalometric features of a group of one hundred children aged from six to sixteen years suffering from chronic perennial allergic rhinitis of differing grades of severity with those of 99 control subjects of similar age. Both samples were drawn from a Children's Hospital which has a large population of patients with chronic perennial allergic rhinitis attending the Alle...

Factors influencing the labelling of rhinitis by doctors were examined in 7702 adults, aged 16-65 years, registered with a group general practice in south London. Individuals with rhinitis were identified by a postal screening questionnaire. Of the 2969 (39%) subjects who replied, 1309 (44%) reported rhinitis. A sample of 340 individuals with and 126 without rhinitis was studied, each being int...

Variation in life history contributes to reproductive success in different environments. Divergence of annual and perennial angiosperm species is an extreme example that has occurred frequently. Perennials survive for several years and restrict the duration of reproduction by cycling between vegetative growth and flowering, whereas annuals live for 1 year and flower once. We used the tribe Arab...

Perennial energy crops (PECs) are increasingly used as feedstock to produce in an environmental friendly way. Compared traditional conversion strategies like thermal use, sophisticated technologies such biomethanation defined different requirements of the feedstock. Whereas first concept relies on dry, woody material, requires a moist Thus, over time, spectrum species PECs has widened. Moreover...

Many plant species have two modes of reproduction: sexual and asexual. Both modes of reproduction have often been viewed as adaptations to temporally or spatially variable environments. The plant should adjust partitioning to match changes in the estimated success of the two reproductive modes. Perennial plants showed that favorable habitats in soil nutrients or water content tend to promote cl...