Results 21 to 30 of about 320,391 (209)

Recurrent emergence of SARS-CoV-2 spike deletion H69/V70 and its role in the Alpha variant B.1.1.7

open access: yesCell Reports, 2021
Summary: We report severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) spike ΔH69/V70 in multiple independent lineages, often occurring after acquisition of receptor binding motif replacements such as N439K and Y453F, known to increase binding ...
Bo Meng   +881 more
doaj   +1 more source

HIP 33609 b: An Eccentric Brown Dwarf Transiting a V = 7.3 Rapidly Rotating B Star

open access: yesThe Astronomical Journal, 2023
We present the discovery and characterization of HIP 33609 b, a transiting warm brown dwarf orbiting a late B star, discovered by NASA's Transiting Exoplanet Survey Satellite as TOI-588 b. HIP 33609 b is a large ( R _b = ${1.580}_{-0.070}^{+0.074}$ R _J )
Noah Vowell   +44 more
doaj   +1 more source

Impact of COVID-19 Pandemic on Cardiovascular Testing in Asia

open access: yesJACC: Asia, 2021
Background: The coronavirus disease-2019 (COVID-19) pandemic significantly affected management of cardiovascular disease around the world. The effect of the pandemic on volume of cardiovascular diagnostic procedures is not known.
Takashi Kudo, MD, PhD   +1205 more
doaj   +1 more source

American hegemony or global governance? Competing visions of international security [PDF]

open access: yes, 2005
An overview is given of two competing visions of contemporary international security: United States hegemony and security governance. According to these perspectives, the current generation is either witnessing the return to classical balance-of-power ...
Krahmann, E
core   +1 more source

La Gran Estrategia de Estados Unidos: en busca de las fuentes doctrinales de las políticas de seguridad internacional de los gobiernos estadounidenses

open access: yesColombia Internacional, 2015
The purpose of this article is to explain the history, sources and variations relating to the grand strategy of United States with regard to international security.
Federmán Rodríguez Morales
doaj   +1 more source

The North American Free Trade Agreement (NAFTA) [PDF]

open access: yes, 2017
[Excerpt] The North American Free Trade Agreement (NAFTA) has been in effect since January 1, 1994. NAFTA was signed by President George H. W. Bush on December 17, 1992, and approved by Congress on November 20, 1993.
Fergusson, Ian F, Villareal, M. Angeles
core   +1 more source

Pitardia resurrected: A new member of subtribe Menthinae (Lamiaceae)

open access: yesTAXON, EarlyView.
Abstract Despite tremendous progress towards clarifying phylogenetic relationships within the mint family (Lamiaceae), uncertainty remains regarding relationships among some major clades as well as the proper placement of some genera. While researching the genus Nepeta, a species from northeastern Morocco, N.
Abdelmonaim Homrani Bakali   +3 more
wiley   +1 more source

Ordem Liberal Internacional e Grande Estratégia Americana (1991-2017): mudanças e continuidades

open access: yesRevista Conjuntura Austral, 2021
Este artigo tem o objetivo de caracterizar a grande estratégia dos Estados Unidos no período entre 1991 e 2017, verificando mudanças e continuidades na política externa americana, com ênfase na construção da ordem liberal internacional pós-Guerra Fria ...
Italo Barreto Poty
doaj   +2 more sources

Typifications in the tribe Browallieae (Cestroideae: Solanaceae)

open access: yesTAXON, EarlyView.
Abstract The tribe Browallieae is a monophyletic group comprising Browallia and Streptosolen. These genera are of significant interest in the horticulture industry due to their ornamental potential. Despite their clear placement in Solanaceae, the tribe presents several taxonomic, phylogenetic, and nomenclatural challenges.
David Hoyos, Sandra Knapp, Rocío Deanna
wiley   +1 more source

A novel circumscription and classification for Neurolaeneae (Asteraceae)

open access: yesTAXON, EarlyView.
Abstract Neurolaeneae (Asteraceae) have a complicated taxonomic history. The tribe was described in 1927, but subsequently disregarded in 1977, and later reinstated as a tribe following a large‐scale phylogenetic analysis of Asteraceae in 2002. To date, this tribe has remained poorly studied and it has never been the subject of a comprehensive ...
Vinicius R. Bueno   +4 more
wiley   +1 more source

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