Long Island University

About: Long Island University is a education organization based out in Brookville, New York, United States. It is known for research contribution in the topics: Population & Poison control. The organization has 2647 authors who have published 4924 publications receiving 108757 citations.

The nature of the principal type 1 interferon-producing cells in human blood.

Abstract: Interferons (IFNs) are the most important cytokines in antiviral immune responses. “Natural IFN-producing cells” (IPCs) in human blood express CD4 and major histocompatibility complex class II proteins, but have not been isolated and further characterized because of their rarity, rapid apoptosis, and lack of lineage markers. Purified IPCs are here shown to be the CD4+CD11c− type 2 dendritic cell precursors (pDC2s), which produce 200 to 1000 times more IFN than other blood cells after microbial challenge. pDC2s are thus an effector cell type of the immune system, critical for antiviral and antitumor immune responses.

The emergence of boundary spanning competence in practice: implications for implementation and use of information systems

Abstract: This paper investigates how an organizational competence in boundary spanning emerges in practice by drawing on the concepts of boundary spanner and boundary object. Using data from two qualitative field studies, we argue that in order for boundary spanning to emerge a new joint field of practice must be produced. Our data illustrate that some agents partially transform their practices in local settings so as to accommodate the interests of their counterparts. While negotiating the new joint field, these agents become what we call boundary spanners-in-practice who produce and use objects which become locally useful and which acquire a common identity-hence, boundary objects-in-use. Moreover, we show how boundary spanners-in-practice use various organizational and professional resources including the influence that comes with being nominated to boundary spanners' roles to create the new joint field. The conditions necessary for boundary spanners-in-practice to emerge are outlined and discussed, as are important implications for IS implementation and use.

Parents' motivations for involvement in children's education: An empirical test of a theoretical model of parental involvement.

Abstract: This study examined the ability of a theoretical model to predict types and levels of parental involvement during the elementary and middle school years. Predictor variables included parents' motivational beliefs about involvement, perceptions of invitations to involvement from others, and perceived life context variables. Analyses of responses from 853 parents of 1st- through 6th-grade students enrolled in an ethnically diverse metropolitan public school system in the mid-southern United States revealed that model constructs predicted significant portions of variance in parents' home- and school-based involvement even when controlling for family socioeconomic status. The predictive power of specific model constructs differed for elementary and middle school parents. Results are discussed in terms of research on parental involvement and school practice.

Areawide Suppression of European Corn Borer with Bt Maize Reaps Savings to Non-Bt Maize Growers

Abstract: Transgenic maize engineered to express insecticidal proteins from the bacterium Bacillus thuringiensis (Bt) has become widely adopted in U.S. agriculture. In 2009, Bt maize was planted on more than 22.2 million hectares, constituting 63% of the U.S. crop. Using statistical analysis of per capita growth rate estimates, we found that areawide suppression of the primary pest Ostrinia nubilalis (European corn borer) is associated with Bt maize use. Cumulative benefits over 14 years are an estimated $3.2 billion for maize growers in Illinois, Minnesota, and Wisconsin, with more than $2.4 billion of this total accruing to non-Bt maize growers. Comparable estimates for Iowa and Nebraska are $3.6 billion in total, with $1.9 billion for non-Bt maize growers. These results affirm theoretical predictions of pest population suppression and highlight economic incentives for growers to maintain non-Bt maize refugia for sustainable insect resistance management.

Phosphorus limitation of nitrogen fixation by Trichodesmium in the central Atlantic Ocean

Abstract: Marine fixation of atmospheric nitrogen is believed to be an important source of biologically useful nitrogen to ocean surface waters1, stimulating productivity of phytoplankton and so influencing the global carbon cycle2. The majority of nitrogen fixation in tropical waters is carried out by the marine cyanobacterium Trichodesmium3, which supplies more than half of the new nitrogen used for primary production4. Although the factors controlling marine nitrogen fixation remain poorly understood, it has been thought that nitrogen fixation is limited by iron availability in the ocean2,5. This was inferred from the high iron requirement estimated for growth of nitrogen fixing organisms6 and the higher apparent densities of Trichodesmium where aeolian iron inputs are plentiful7. Here we report that nitrogen fixation rates in the central Atlantic appear to be independent of both dissolved iron levels in sea water and iron content in Trichodesmium colonies. Nitrogen fixation was, instead, highly correlated to the phosphorus content of Trichodesmium and was enhanced at higher irradiance. Furthermore, our calculations suggest that the structural iron requirement for the growth of nitrogen-fixing organisms is much lower than previously calculated6. Although iron deficiency could still potentially limit growth of nitrogen-fixing organisms in regions of low iron availability—for example, in the subtropical North Pacific Ocean—our observations suggest that marine nitrogen fixation is not solely regulated by iron supply.