Frost tolerance of Liquidambar styraciflua native to the United States, Mexico, and Central America

1971 ◽  
Vol 49 (9) ◽  
pp. 1551-1558 ◽  
Author(s):  
George J. Williams, III ◽  
Calvin McMillan
Keyword(s):  
United States ◽  
Central America ◽  
The United States ◽  
Frost Tolerance ◽  
Liquidambar Styraciflua ◽  
United States Mexico ◽  
Amo 1618 ◽  
The U.S ◽  
Collection Sites ◽  
Selection Of

Seedlings derived from field-collected seed from the United States, Mexico, and Central America were tested for frost hardiness under laboratory conditions. U.S. seedlings grown under four controlled conditions demonstrated greatest frost hardening under cool temperatures and short day lengths. Seedlings representing northernmost U.S. collection sites developed greater frost tolerance than seedlings representing southern U.S. collection sites. In comparing United States, Mexico, and Central America seedlings, the U.S. material showed greatest frost tolerance with Mexico and Central America demonstrating similar hardiness. The application of plant hormones (natural gibberellic acid and artificial AMO-1618) produced opposite effects on U.S. seedlings derived from Connecticut and Florida seed. The Connecticut seedlings demonstrated greatest frost tolerance in all treatments. Demonstrated frost tolerance differences among United States, Mexico, and Central America populations strongly indicate selection of frost hardy races in habitats with severe frost conditions.

A BIOSYSTEMATIC REVISION OF THE GENUS MUSCIDIFURAX (HYMENOPTERA: PTEROMALIDAE) WITH DESCRIPTIONS OF FOUR NEW SPECIES

1970 ◽  
Vol 102 (10) ◽  
pp. 1268-1290 ◽  
Author(s):  
Marcos Kogan ◽  
E. F. Legner
Keyword(s):  
United States ◽  
Puerto Rico ◽  
Central America ◽  
New World ◽  
The United States ◽  
Additional Species ◽  
Local Populations ◽  
Morphological Studies ◽  
Scanning Electronmicroscopy ◽  
United States Mexico

AbstractExtensive collections of synanthropic fly parasitoids in animal excrement accumulations in the United States, Mexico, Costa Rica, Puerto Rico, Uruguay, Chile, Denmark, Israel, and South Africa yielded seven forms of a Muscidifurax complex which were totally or partially reproductively isolated. Morphological studies of female and male parasitoids coupled with biological and zoogeographical information permitted the identification of five sibling species. Muscidifurax raptor Girault and Sanders 1910 is redescribed and four additional species are described as new: M. zaraptor, from the southwestern United States; M. raptoroides from Central America and Mexico; M. uniraptor from Puerto Rico, and M. raptorellus from Uruguay and Chile. Biological notes are added to the descriptions, and it was postulated that the genus is undergoing a process of speciation with local populations slowly becoming reproductively isolated and eventually giving rise to morphologically distinguishable entities. Most evidence suggests the establishment of Muscidifurax in the New World, concomitant with or shortly following the establishment of muscoid flies in accumulated excrement. Scanning electronmicroscopy was used in the analysis of some morphological structures.

scholarly journals United States : Good Ideas from Successful Cities : Regional Snapshots in Comparative Perspective

2021 ◽  
Author(s):  
Kim Turner
Keyword(s):  
United States ◽  
The United States ◽  
Immigrant Integration ◽  
Comparative Perspective ◽  
The U.S ◽  
Selection Of

<div>Our main report, Good Ideas from Successful Cities: Municipal Leadership in Immigrant Integration, explores these themes through a selection of nearly 40 profiles of municipal practice and policies from cities across Canada, the U.S., Europe and Australasia. In this companion report, United States: Good Ideas from Successful Cities, we present an additional snapshot of municipal leadership and excellence in immigrant integration from cities in the United States. Each of these five city profiles includes a selection of related international city practices to encourage comparative perspective and enriched learning.</div>

Buffering North America

2019 ◽  
pp. 123-159
Author(s):  
David Scott FitzGerald
Keyword(s):  
United States ◽  
North America ◽  
Central America ◽  
Civil Wars ◽  
The United States ◽  
Refugee Camps ◽  
Central Americans ◽  
Mexican Government ◽  
Southern Border ◽  
The U.S

Washington and Ottawa have tried to keep out most of the Central Americans fleeing to North America beginning in the civil wars of the 1980s. Central America and Mexico buffer the United States, which in turn buffers Canada. The U.S. government has propped up client states in Central America; paid for refugee camps; and provided training, equipment, and financing for migration controls further south. Mexico has weak rights of territorial personhood, so rather than strictly controlling entry across its southern border, its entire territory has become a “vertical frontier” with the United States. Aggressive U.S. enforcement at the Mexican border traps transit migrants in Mexico and creates an incentive for the Mexican government to deport them. But harsh U.S. enforcement on its border and the fact that it targets Mexicans as well as third-country nationals impedes the bilateral cooperation that would make Mexico a more effective buffer.

Organized Interests and Agenda Setting in the U.S. Supreme Court

1988 ◽  
Vol 82 (4) ◽  
pp. 1109-1127 ◽  
Author(s):  
Gregory A. Caldeira ◽  
John R. Wright
Keyword(s):  
United States ◽  
Supreme Court ◽  
United States Supreme Court ◽  
The United States ◽  
United States Supreme ◽  
Amicus Curiae ◽  
Organized Interests ◽  
Using Data ◽  
The U.S ◽  
Selection Of

Participation as amicus curiae has long been an important tactic of organized interests in litigation before the U.S. Supreme Court. We analyze amicus curiae briefs filed before the decision on certiorari and assess their impact on the Court's selection of a plenary docket. We hypothesize that one or more briefs advocating or opposing certiorari increase the likelihood of its being granted. We test this hypothesis using data from the United States Reports and Briefs and Records of the United States Supreme Court for the 1982 term. The statistical analysis demonstrates that the presence of amicus curiae briefs filed prior to the decision on certiorari significantly and positively increases the chances of the justices' binding of a case over for full treatment—even after we take into account the full array of variables other scholars have hypothesized or shown to be substantial influences on the decision to grant or deny.

The Representation of the U.S.-Mexico Border in Television News: Textual Analysis on Bodies and Security Enforcement

2019 ◽  
Vol 15 (29) ◽  
Author(s):  
David Gonzalez Hernandez
Keyword(s):  
United States ◽  
Textual Analysis ◽  
Television News ◽  
The United States ◽  
Border Region ◽  
Local Network ◽  
News Reports ◽  
Mexico Border ◽  
United States Mexico ◽  
The U.S

This article analyzes how television news has enhanced the role of representation of the United States-Mexico border in themes such as immigration, theme represented in “spectacular” ways related to “warfare”. Using textual analysis on TV reports, my aim is to show how local television network news in the United States (NBC) and Mexico (Televisa) construct the representation of the U.S./Mexico border through a particular conflicting vision to account for border enforcements and interventions on both sides and with similar visual strategies. The analysis centers on actual “visual text” or television news reports, which tries to demonstrates how assumptions guide the activity of local network coverage, and how, at the same time, limits what is reported in news. This consequently contributes to the perpetuation of a representation related to ¨crisis¨ in the border region.

Central America and the United States: Overlooked Foreign Policy Objectives

1993 ◽  
Vol 50 (1) ◽  
pp. 1-30 ◽  
Author(s):  
Thomas M. Leonard
Keyword(s):  
United States ◽  
Foreign Policy ◽  
Central America ◽  
The United States ◽  
Economic Gain ◽  
Policy Objectives ◽  
The Relationship ◽  
The U.S

Since the fall of Nicaragua's Somoza dynasty in 1979, nearly 900 books dealing with Central America have appeared. They repeat the themes of imperialism, paternalism, and security that traditionally have characterized studies about Central America and its relations with the U.S. The imperialist theme is pursued by Walter LaFeber's Inevitable Revolutions and Karl Berman's Under the Big Stick. They assert that the United States economically exploited and politically controlled Central America in general and Nicaragua in particular. A sense of moral righteousness is found in Tom Buckley's Violent Neighbors and Richard Alan White's The Morass while the security theme is pursued by John Findling in his Close Neighbors, Distant Friends. Histories about Central America reinforce these themes. For example, the Dean of the U.S. Central Americanists Ralph Lee Woodward, Jr., and Costa Ricans Edelberto Torres-Rivas and Hector Pérez-Brignoli, and Honduran Mario Argueta demonstrate that the American businessmen capitalized upon the ignorance of region's elite for their own economic gain. Despite their diversity, all of these volumes demonstrate that the United States dominated the relationship and criticize it for so doing.

scholarly journals Blurred Boundaries: Drugs, Immigration & Border Policy Along the U.S.-Mexico Divide

2016 ◽  
Vol 3 ◽  
Author(s):  
Logan Carmichael
Keyword(s):  
United States ◽  
The United States ◽  
Government Policies ◽  
Border Policy ◽  
United States Mexico ◽  
The U.S

Drugs, immigration, and border policy are intrinsically linked in the context of the United States-Mexico divide.  However, there are often misunderstandings that border policy and immigration from Mexico are the root causes of a ‘drug epidemic’ in America.  This paper dispels these misconceptions by exploring the diverse sources of illicit narcotics and examining the ideologies, government policies, and underlying domestic issues that comprise this epidemic.

scholarly journals First Report of Daylily Rust in the United States

Plant Disease ◽  
2001 ◽  
Vol 85 (10) ◽  
pp. 1121-1121 ◽  
Author(s):  
J. L. Williams-Woodward ◽  
J. F. Hennen ◽  
K. W. Parda ◽  
J. M. Fowler
Keyword(s):  
United States ◽  
Central America ◽  
The United States ◽  
Central American ◽  
Plant Materials ◽  
Original Source ◽  
Initial Symptoms ◽  
Average Size ◽  
Flora Of Japan ◽  
The U.S

In August 2000, rust symptoms were observed on the leaves of daylily plants (Hemerocallis sp. cv. Pardon Me) at a nursery in Dearing, GA. Based on urediniospore characters, the pathogen was tentatively identified as Puccinia hemerocallidis Thuem. Urediniospores were globose to ellipsoid and measured 19 to 30 × 17 to 22 μm (average size of 22 × 19 μm), corresponding to the previously reported description from Japan (1). Teliospores were absent from the sample but were found on daylily plants (cv. Star Struck) with symptoms similar to cv. Pardon Me from the same nursery in Dearing beginning in October 2000. However, the teliospores differed from those in the published description in that many one-celled teliospores (i.e., mesospores), measuring 32 to 43 × 14 to 19 μm (average size of 38 × 16 μm), were produced in addition to two-celled teliospores, which measured 41 to 53 × 16 to 21 μm (average size of 46 × 18 μm). Similar mesospores were present in a slide from an isotype specimen of P. hemerocallidis (US 72719) housed in the U.S. National Fungus Collection (Beltsville, MD). Daylily plants (cv. Pardon Me) were reinoculated with urediniospores by shaking infected plants over uninfected plants and exposing plants to 100% relative humidity for 24 h. Initial symptoms of small, discrete, yellow spots and streaks on the upper surfaces of leaves developed within 3 to 7 days, and uredia with urediniospores were evident at 7 to 14 days after inoculation. Daylily rust is native to Asia and may have been introduced into Georgia on plant materials sent from Central America. The original source of daylily rust is unclear because Central American producers also purchase and import plants from the United States for propagation and then sell divisions back to U.S. growers. Daylily rust is a disease of major concern for both daylily producers and gardeners. References: (1) N. Hiratsuka, et al. The Rust Flora of Japan. Tsukuba Shuppankai, Ibaraki, Japan, 1992.

Synthesis of Results from the North American Monsoon Experiment (NAME) Process Study

2007 ◽  
Vol 20 (9) ◽  
pp. 1601-1607 ◽  
Author(s):  
Wayne Higgins ◽  
David Gochis
Keyword(s):  
United States ◽  
Central America ◽  
North American ◽  
The United States ◽  
Background Information ◽  
North American Monsoon ◽  
The North ◽  
Process Study ◽  
Monsoon System ◽  
United States Mexico

Abstract An international team of scientists from the United States, Mexico, and Central America carried out a major field campaign during the summer of 2004 to develop an improved understanding of the North American monsoon system leading to improved precipitation forecasts. Results from this campaign, which is the centerpiece of the North American Monsoon Experiment (NAME) Process Study, are reported in this issue of the Journal of Climate. In addition to a synthesis of key findings, this brief overview article also raises some important unresolved issues that require further attention. More detailed background information on NAME, including motivating science questions, where NAME 2004 was conducted, when, and the experimental design, was published previously by Higgins et al.

The United States–Mexico Border

2017 ◽  
Author(s):  
C. J. Alvarez
Keyword(s):  
United States ◽  
Mexican Americans ◽  
Local Level ◽  
The United States ◽  
Porous Membrane ◽  
Mexico Border ◽  
Scarce Water ◽  
United States Mexico ◽  
Established Firm ◽  
The U.S

The region that today constitutes the United States–Mexico borderland has evolved through various systems of occupation over thousands of years. Beginning in time immemorial, the land was used and inhabited by ancient peoples whose cultures we can only understand through the archeological record and the beliefs of their living descendants. Spain, then Mexico and the United States after it, attempted to control the borderlands but failed when confronted with indigenous power, at least until the late 19th century when American capital and police established firm dominance. Since then, borderland residents have often fiercely contested this supremacy at the local level, but the borderland has also, due to the primacy of business, expressed deep harmonies and cooperation between the U.S. and Mexican federal governments. It is a majority minority zone in the United States, populated largely by Mexican Americans. The border is both a porous membrane across which tremendous wealth passes and a territory of interdiction in which noncitizens and smugglers are subject to unusually concentrated police attention. All of this exists within a particularly harsh ecosystem characterized by extreme heat and scarce water.

Sign in / Sign up

Export Citation Format

Share Document