Endophyte Infected Tall Fescue: Plant Symbiosis to Animal Toxicosis

Endophyte-infected fescue is a major cool season forage used for livestock production in the United States and through other areas of the world. A unique aspect of this forage resource is the symbiotic relationship with an endophytic fungus (Epichloë coenophiala) that has detrimental impact on herbivores due to toxic ergot alkaloids. Research over the past 50 years has unveiled details regarding this symbiotic relationship. This review focuses on the origin of tall fescue in the United States and the consequences of its wide-spread utilization as a livestock forage, along with the discovery and toxicodynamics of ergot alkaloids produced by E. coenophiala. The majority of past ergot alkaloid research has focused on observing phenotypic changes that occur in livestock affected by ergot alkaloids, but recent investigation of the metabolome, transcriptome, and proteome have shown that fescue toxicity-related illnesses are much more complex than previous research suggests.

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Metamifop Rates, Application Timings, and Broadleaf Herbicide Admixtures Affect Smooth Crabgrass Control in Turf

Weed Technology ◽

10.1614/wt-d-14-00011.1 ◽

2014 ◽

Vol 28 (4) ◽

pp. 617-625

Author(s):

Michael C. Cox ◽

Shawn D. Askew

Keyword(s):

United States ◽

Tall Fescue ◽

Kentucky Bluegrass ◽

The United States ◽

Field Trials ◽

Annual Grass ◽

Insufficient Information ◽

Cool Season ◽

Control Field ◽

Better Than

Metamifop is an aryloxyphenoxypropionate herbicide under evaluation in the United States for annual grass control in cool-season turfgrasses. Insufficient information is available on the most effective metamifop application timings and mixtures for POST smooth crabgrass control. Field trials conducted in Blacksburg, VA, evaluated metamifop for smooth crabgrass control in existing stands of perennial ryegrass, Kentucky bluegrass, and tall fescue at three rates compared to fenoxaprop, metamifop applied twice at three application intervals, and metamifop in combination with the broadleaf herbicides carfentrazone, 2,4-D plus dicamba plus mecoprop (DDM), and mesotrione. Smooth crabgrass control was equivalent with metamifop at 400 g ai ha−1and fenoxaprop at 195 g ai ha−1. Smooth crabgrass cover was 2% or less, 12 wk after initial treatment, when treated twice with metamifop (300 g ha−1) at a 3-, 6-, or 8-wk interval and significantly better than metamifop applied once. Smooth crabgrass cover was significantly greater at every assessment date in plots treated with metamifop plus DDM than all other metamifop plus broadleaf herbicide admixtures. Metamifop did not appear to significantly injure any turfgrass in these studies, but conclusions about metamifop safety to cool-season turfgrasses cannot be made from these studies due to nonreplication of turfgrass species. According to these data, metamifop is an effective herbicide for controlling smooth crabgrass in cool-season turfgrasses when applied once at 300 or 400 g ha−1or twice at a 3-, 6-, or 8-wk interval. Although metamifop continues to control smooth crabgrass when added to some broadleaf herbicides, smooth crabgrass control was reduced when metamifop was combined with DDM.

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Serrated Tussock (Nassella trichotoma) in the United States

Weed Technology ◽

10.1017/s0890037x00027998 ◽

1993 ◽

Vol 7 (2) ◽

pp. 525-528 ◽

Cited By ~ 3

Author(s):

Randy G. Westbrooks ◽

Gene Cross

Keyword(s):

United States ◽

South Africa ◽

New Zealand ◽

South America ◽

The United States ◽

Past Century ◽

Cool Season ◽

The Past ◽

The United Kingdom ◽

Cool Season Grass

Serrated tussock [(Nassella trichotoma (Nees) Hack. # STDTR] is a clump-forming, perennial, cool season grass. It is native to South America, where it occurs in Argentina, Brazil, Chile, Peru, and Uruguay. In the past century, it has been introduced to New Zealand, Australia and South Africa, and also occurs in small acreages in France, Italy, and the United Kingdom. Serrated tussock occurs in fields, wastelands, and pastures, but rarely in wet or shaded areas.

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International Research and Variation in Views of Ethnicity

Perspectives on Global Issues in Communication Sciences and Related Disorders ◽

10.1044/gics2.2.66 ◽

2012 ◽

Vol 2 (2) ◽

pp. 66-72

Author(s):

Ella Inglebret ◽

Amy Skinder-Meredith ◽

Shana Bailey ◽

Carla Jones ◽

Ashley France

Keyword(s):

United States ◽

Classification System ◽

International Research ◽

The United States ◽

Research Articles ◽

Journal Articles ◽

Research Participants ◽

The Past ◽

International Scale ◽

Publication Patterns

The authors in this article first identify the extent to which research articles published in three American Speech-Language-Hearing Association (ASHA) journals included participants, age birth to 18 years, from international backgrounds (i.e., residence outside of the United States), and go on to describe associated publication patterns over the past 12 years. These patterns then provide a context for examining variation in the conceptualization of ethnicity on an international scale. Further, the authors examine terminology and categories used by 11 countries where research participants resided. Each country uses a unique classification system. Thus, it can be expected that descriptions of the ethnic characteristics of international participants involved in research published in ASHA journal articles will widely vary.

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Proportion of Individuals With Past-Year Suicidal Ideation Who Attempted Suicide Over the Past 10 Years in the United States, and the Influence of Age and Sex

Crisis ◽

10.1027/0227-5910/a000690 ◽

2020 ◽

pp. 1-5

Author(s):

Shannon Lange ◽

Courtney Bagge ◽

Charlotte Probst ◽

Jürgen Rehm

Keyword(s):

United States ◽

Suicidal Ideation ◽

Random Effects ◽

Attempted Suicide ◽

Suicide Attempts ◽

The United States ◽

Individual Level ◽

The Past ◽

Meta Analyses ◽

Age Category

Abstract. Background: In recent years, the rate of death by suicide has been increasing disproportionately among females and young adults in the United States. Presumably this trend has been mirrored by the proportion of individuals with suicidal ideation who attempted suicide. Aim: We aimed to investigate whether the proportion of individuals in the United States with suicidal ideation who attempted suicide differed by age and/or sex, and whether this proportion has increased over time. Method: Individual-level data from the National Survey on Drug Use and Health (NSDUH), 2008–2017, were used to estimate the year-, age category-, and sex-specific proportion of individuals with past-year suicidal ideation who attempted suicide. We then determined whether this proportion differed by age category, sex, and across years using random-effects meta-regression. Overall, age category- and sex-specific proportions across survey years were estimated using random-effects meta-analyses. Results: Although the proportion was found to be significantly higher among females and those aged 18–25 years, it had not significantly increased over the past 10 years. Limitations: Data were self-reported and restricted to past-year suicidal ideation and suicide attempts. Conclusion: The increase in the death by suicide rate in the United States over the past 10 years was not mirrored by the proportion of individuals with past-year suicidal ideation who attempted suicide during this period.

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EDITORIAL: Migration and competitiveness: Japan and the United States

MIGRATION LETTERS ◽

10.33182/ml.v10i2.138 ◽

2013 ◽

Vol 10 (2) ◽

pp. 115-124

Author(s):

Philip L. Martin

Keyword(s):

United States ◽

The United States ◽

Variable Cost ◽

Fixed Cost ◽

Special Issue ◽

Science And Engineering ◽

The Past ◽

Past Half Century ◽

Key Sectors ◽

Past Half

Japan and the United States, the world’s largest economies for most of the past half century, have very different immigration policies. Japan is the G7 economy most closed to immigrants, while the United States is the large economy most open to immigrants. Both Japan and the United States are debating how immigrants are and can con-tribute to the competitiveness of their economies in the 21st centuries. The papers in this special issue review the employment of and impacts of immigrants in some of the key sectors of the Japanese and US economies, including agriculture, health care, science and engineering, and construction and manufacturing. For example, in Japanese agriculture migrant trainees are a fixed cost to farmers during the three years they are in Japan, while US farmers who hire mostly unauthorized migrants hire and lay off workers as needed, making labour a variable cost.

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Democratic Legitimacy

10.23943/princeton/9780691149486.001.0001 ◽

2011 ◽

Cited By ~ 39

Author(s):

Pierre Rosanvallon

Keyword(s):

United States ◽

The United States ◽

Democratic Legitimacy ◽

Political Leaders ◽

Constitutional Courts ◽

International Debate ◽

The Past ◽

Democratic Authority ◽

Original Contribution ◽

Western Democracies

It's a commonplace occurrence that citizens in Western democracies are disaffected with their political leaders and traditional democratic institutions. But this book argues that this crisis of confidence is partly a crisis of understanding. The book makes the case that the sources of democratic legitimacy have shifted and multiplied over the past thirty years and that we need to comprehend and make better use of these new sources of legitimacy in order to strengthen our political self-belief and commitment to democracy. Drawing on examples from France and the United States, the book notes that there has been a major expansion of independent commissions, NGOs, regulatory authorities, and watchdogs in recent decades. At the same time, constitutional courts have become more willing and able to challenge legislatures. These institutional developments, which serve the democratic values of impartiality and reflexivity, have been accompanied by a new attentiveness to what the book calls the value of proximity, as governing structures have sought to find new spaces for minorities, the particular, and the local. To improve our democracies, we need to use these new sources of legitimacy more effectively and we need to incorporate them into our accounts of democratic government. This book is an original contribution to the vigorous international debate about democratic authority and legitimacy.

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The Riddle of a Common History

Journal of Educational Media Memory and Society ◽

10.3167/jemms.2009.010107 ◽

2009 ◽

Vol 1 (1) ◽

pp. 93-116 ◽

Cited By ~ 2

Author(s):

Mauricio Tenorio-Trillo

Keyword(s):

United States ◽

Common Ground ◽

The United States ◽

History Textbooks ◽

Recent History ◽

History Textbook ◽

The Past ◽

The Us ◽

Constant Part ◽

Intrinsic Component

By identifying two general issues in recent history textbook controversies worldwide (oblivion and inclusion), this article examines understandings of the United States in Mexico's history textbooks (especially those of 1992) as a means to test the limits of historical imagining between U. S. and Mexican historiographies. Drawing lessons from recent European and Indian historiographical debates, the article argues that many of the historical clashes between the nationalist historiographies of Mexico and the United States could be taught as series of unsolved enigmas, ironies, and contradictions in the midst of a central enigma: the persistence of two nationalist historiographies incapable of contemplating their common ground. The article maintains that lo mexicano has been a constant part of the past and present of the US, and lo gringo an intrinsic component of Mexico's history. The di erences in their historical tracks have been made into monumental ontological oppositions, which are in fact two tracks—often overlapping—of the same and shared con ictual and complex experience.

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The Challenges of Displaying “Asian American”: Curatorial Perspectives and Critical Approaches

10.36650/nexus5.1_12-32_wang ◽

2007 ◽

Vol 5 (1) ◽

pp. 12-32

Author(s):

ShiPu Wang

Keyword(s):

United States ◽

Asian American ◽

Financial Support ◽

American Art ◽

The United States ◽

Community Leaders ◽

Art Exhibitions ◽

The Past ◽

Critical Approaches ◽

Racial Demographics

This essay delineates the issues concerning AAPI art exhibitions from a curator’s perspective, particularly in response to the changing racial demographics and economics of the past decades. A discussion of practical, curatorial problems offers the reader an overview of the obstacles and reasons behind the lack of exhibitions of AAPI works in the United States. It is the author’s hope that by understanding the challenges particular to AAPI exhibitions, community leaders, and patrons will direct future financial support to appropriate museum operations, which in turn will encourage more exhibitions and research of the important artistic contribution of AAPI artists to American art.

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