Listar por título
Mostrando ítems 24575-24594 de 34322
-
Orbitals in general chemistry, Part I: The great debate
(2020-08)In Part I of a three-part series, we present an objective survey of the technical literature discussing the inclusion of orbitals in highschool and post-secondary general chemistry. We start with the definition of orbitals. ... -
Orbitals in general chemistry, Part II: Mathematical Realities
(2021)In Part II of a three-part series, we discuss two factors absent from textbooks of general chemistry that are important in a discussion of teaching orbitals. First, atomic orbitals are shown systematically to comprise ... -
Orbitals in general chemistry, Part III: Consequences for Teaching
(2021)In Part III of this series, we undertake a critique of the nature of application of orbitals to describe or to explain the structure and the binding within molecules and materials. Teaching orbitals in introductory chemistry ... -
Orchid taxonomy on a global scale: a network for data verification
(2018)The genesis and early establishment of the Epidendra project are presented, reviewing the implications of taxonomic databasing on a global scale. The need for data verification and the adoption of an open systematic framework ... -
Orchidaceae acostanae: typification of Costa Rican orchid species described by Rudolf Schlechter from collections by Guillermo Acosta
(2023)Rudolf Schlechter (1872–1925) described several orchid taxa based on specimens collected in Costa Rica during the first half of the 20th century. Unfortunately, the type material kept at the Botanical Museum of Berlin-Dahlem ... -
Orchidaceae tonduzianae: Typification of Costa Rican Orchidaceae Described from Collections of Adolphe Tonduz
(2016-12-31)The Swiss botanist Adolphe Tonduz worked in Costa Rica from 1889 to 1920. For 20 years he carried out important activities as a plant collector and the curator of the largest Costa Rican herbarium beginning at the Instituto ... -
Orchidaceae werckleanae: typification of Costa Rican orchid species described from collections by K. Wercklé
(2010)A catalogue of 84 orchid species described by R. Schlechter from plants collected in Costa Rica by Karl Wercklé is presented. Lectotypification is provided for 60 of the 84 species. Previously lectotypified species, based ... -
Orchids of Paradise
(2018)WHERE IT ALL BEGAN The Italian explorer and navigator Cristoforo Colombo (Christopher Columbus, c.1451–1506) discovered the paradise during his fourth voyage across the Atlantic Ocean, when searching for a passage west ...