Nicolás García

University of Chile

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Co-Authors

Vu Thien Binh

Université Claude Bernard Lyon 1

Frank O. Goodman

University of Waterloo

María José Román

University of Florida

Alan W. Meerow

Montgomery Botanical Center

José M. Soler

Universidad Autónoma de Madrid

P. A. Serena

Instituto de Ciencia de Materiales de Madrid

V. Celli

University of Virginia

Pamela S. Soltis

University of Florida

N. Cabrera

Universidad de la República

J. R. Solana

Universidad de Cantabria

Cooperative Institutions

Apis Flora (Brazil)

750

University of New Caledonia

165

Instituto de Botânica

129

Instituto de Pesquisas Jardim Botânico do Rio de Janeiro

112

Universidade de São Paulo

107

Universidade Estadual de Campinas (UNICAMP)

Universidade Estadual de Feira de Santana

Universidade Federal do Rio de Janeiro

John Wiley & Sons (United States)

Hudson Institute

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Research Field

Scattering of helium atoms by surfaces at low energies and temperatures

Surface Science Letters (1986)

Frank O. Goodman Nicolás García Jesus Reyes Jesús García-Fernández

10.1016/0167-2584(86)91095-9

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Citations (0)

Elastic quantum resistance between metallic interfaces

Physical review. B, Condensed matter (1988)

Nicolás García E. Stoll

We present calculations on the elastic quantum resistance of a rough interface between two metals. Our results show that the resistance is basically determined by the ratio of the Fermi energies of the two metals, and is surprisingly insensitive even to large-amplitude roughness. These quantum resistances have characteristic values in the range of ${10}^{4}$--${10}^{6}$ \ensuremath{\Omega} A\r{} $^{2}$.

10.1103/physrevb.37.4415

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Citations (7)

Calceolaria ascendens subsp. exigua, comb. et stat. nov. (Calceolariaceae), endémica de la cordillera de la Costa de Chile central

Gayana. Botánica (2010)

Nicolás García

The new combination Calceolaria ascendens Lindl.subsp.exigua (Witasek) Nic.García is made based on material collected at Central Chile's Coastal mountain range, around parallel 33º S. The new subspecies inhabits rock crevices at the high mountain between 1,600 and 2,100 m a.s.l.

Exigua

10.4067/s0717-66432010000100014

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Citations (1)

Technological applications of scanning tunneling microscopy at atmospheric pressure

Applied Physics Letters (1985)

Rodolfo Miranda Nicolás García A. M. Baró Ricardo Garcı́a J. Peña

We present experimental evidence of the capability of the scanning tunneling microscope (STM) to image the microstructure of surfaces with atomic resolution even at atmospheric pressure. Some examples of different types of materials (metal single crystals, graphite, semiconductor, oxide and metal films) are shown. We propose the STM as a highly sensitive standard for surface roughness determination of industrial finishing at atmospheric pressure. In our opinion, these results may open new perspectives in technology and industrial applications.

10.1063/1.96167

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Citations (54)

Rediscovery of Ivania juncalensis Al-Shehbaz (Thelypodieae; Brassicaceae), an endemic and threatened species from the Andes of Central Chile

Phytotaxa (2022)

Arón Cádiz-Véliz NICOLÁS MARÍN ROMÁN Rafael Urbina‐Casanova Nicolás García BÁRBARA PALMA-VILLALOBOS

The genus Ivania is endemic to the Andes in Central Chile and comprises two species of range-restricted perennial herbs. Ivania juncalensis was described based on a single herbarium specimen collected in 1976, at a high elevation in the Río Juncal watershed. Given that the population site and status were unknown for more than 30 years, this species was considered potentially extinct. In this article we report the rediscovery of I. juncalensis in the Andes of Valparaiso region. Additionally, we provide an expanded description and new information about its distribution, habitat, ecology, and conservation status.

Herbarium

Eudicots

Endemism

Brassicaceae

10.11646/phytotaxa.558.3.3

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Citations (0)

Scattering of He Atoms from Crystal Surfaces: A Tentative Analysis on the Surface Crystallography of LiF(001)

Physical Review Letters (1976)

Nicolás García

This Letter describes a theoretical treatment of the excellent experimental results of Boato, Cantini, and Mattera for the He-LiF(001) system, in terms of a hard corrugated model for the surface. From the agreement achieved between theory and experiments, I conclude that one can represent the corrugated surface by ${z}_{1}(x,y)=\frac{1}{2}{\ensuremath{\zeta}}_{1}[cos(\frac{2\ensuremath{\pi}x}{a})+cos(\frac{2\ensuremath{\pi}y}{a})]+\frac{1}{2}{\ensuremath{\zeta}}_{2}{cos[\frac{2\ensuremath{\pi}(x+y)}{a}]+cos[\frac{2\ensuremath{\pi}(x\ensuremath{-}y)}{a}]}$, with ${\ensuremath{\zeta}}_{1}=0.307\ifmmode\pm\else\textpm\fi{}0.003$ \AA{} and ${\ensuremath{\zeta}}_{2}=0.017\ifmmode\pm\else\textpm\fi{}0.003$ \AA{}. This implies that the ${\mathrm{Li}}^{+}$ appear to be displaced upwards from the crystal surface by 0.036\ifmmode\pm\else\textpm\fi{}0.006 \AA{}.

Crystal (programming language)

10.1103/physrevlett.37.912

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Citations (74)

Tunneling Spectroscopy and Inverse Photoemission: Image and Field States

Physical Review Letters (1985)

G. Binnig K. H. Frank Harald Fuchs Nicolás García B. Reihl

Tunneling spectroscopy performed with the scanning tunneling microscope is used to study image-type surface states. The tunneling tip causes a Stark shift and expansion of the hydrogenic image-state spectrum, permitting a clear resolution of the individual states. A simple theoretical model provides a quantitative connection between the tunneling data and both previous and new inverse-photoemission data.

Inverse photoemission spectroscopy

Surface States

10.1103/physrevlett.55.991

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Citations (397)

One thousand plant transcriptomes and the phylogenomics of green plants

Nature (2019)

Mack J.H. Leebens Sean W. Graham Gane Ka‐Shu Wong Lisa DeGironimo Patrick P. Edger

Green plants (Viridiplantae) include around 450,000-500,000 species1,2 of great diversity and have important roles in terrestrial and aquatic ecosystems. Here, as part of the One Thousand Plant Transcriptomes Initiative, we sequenced the vegetative transcriptomes of 1,124 species that span the diversity of plants in a broad sense (Archaeplastida), including green plants (Viridiplantae), glaucophytes (Glaucophyta) and red algae (Rhodophyta). Our analysis provides a robust phylogenomic framework for examining the evolution of green plants. Most inferred species relationships are well supported across multiple species tree and supermatrix analyses, but discordance among plastid and nuclear gene trees at a few important nodes highlights the complexity of plant genome evolution, including polyploidy, periods of rapid speciation, and extinction. Incomplete sorting of ancestral variation, polyploidization and massive expansions of gene families punctuate the evolutionary history of green plants. Notably, we find that large expansions of gene families preceded the origins of green plants, land plants and vascular plants, whereas whole-genome duplications are inferred to have occurred repeatedly throughout the evolution of flowering plants and ferns. The increasing availability of high-quality plant genome sequences and advances in functional genomics are enabling research on genome evolution across the green tree of life.

Phylogenomics

plant evolution

Lineage (genetic)

Coalescent theory

Green algae

10.1038/s41586-019-1693-2

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Citations (1,409)

(2692) Proposal to conserve Zephyranthes (Amaryllidaceae), nom. cons. against an additional name, Sprekelia

Taxon (2019)

Nicolás García Alan W. Meerow Silvia Arroyo‐Leuenberger Walter S. Judd

(2692) Zephyranthes Herb., Appendix: 36. Dec 1821 [Amaryllid.] nom. cons. Typus: Z. atamasca (L.) Herb. (Amaryllis atamasca L.) (typ. cons.). (=) Sprekelia Heist., Beschr. Neu. Geschl.: 15, 19. 1755, nom. rej. prop. Typus: S. formosissima (L.) Herb. (Amaryllis formosissima L.). In an accompanying paper in Taxon (García & al. in Taxon 68: 481–498. 2019), we present a new classification for Amaryllidaceae tribe Hippeastreae, based on phylogenomic analyses of the tribe that strongly suggest that early reticulation has been a feature of the evolution of subtribe Hippeastrinae in particular (García & al. in Syst. Bot. 39: 75–89. 2014, in Molec. Phylogen. Evol. 111: 231–247. 2017), thus violating the principle of monophyly if current classifications were to remain intact. In that paper, we propose that subtribe Hippeastrinae should consist of only two genera, Hippeastrum Herb. and Zephyranthes Herb. We believe (for reasons detailed in García & al., l.c. 2019) that this is a much more acceptable solution to the conundrum of this subtribe's taxonomy than the recognition of a single genus, Hippeastrum, as proposed – without any supporting data – by Christenhusz & al. (The Global Flora, Nomenclature Part 1: 58. 2018). Linnaeus (Sp. Pl.: 293. 1753) described what would become the type of Sprekelia Heist. as Amaryllis formosissima L. Heister (Beschr. Neu. Geschl.: 15, 19. 1755) named the genus Sprekelia but did not formally transfer A. formosissima. Herbert (Appendix: 36. 1821) recognized the genus and transferred A. formosissima to it as S. formosissima (L.) Herb. Only a single additional species, S. howardii Lehmiller (in Herbertia 54: 230. 2000) is currently recognized. Other names in the genus have been relegated to synonymy under S. formosissima or moved to Hippeastrum Herb. (two species of Hippeastrum, H. angustifolium Pax [in Bot. Jahrb. Syst. 11: 331. 1889] and H. cybister (Herb.) Benth. ex Baker [Handb. Amaryll.: 42. 1888], have ultra-zygomorphic floral morphology similar to Sprekelia [Meerow in Sebert & al., Diversity, Phylogeny Evol. Monocotyledons: 145–168. 2010; García & al., l.c. 2014]). Phylogenetic analyses of DNA sequences (Meerow & al. in Syst. Bot. 25: 708–726. 2000; Meerow, l.c. 2010; García & al., l.c. 2014) resolve Sprekelia as deeply embedded in the species-rich Zephyranthes s.l. The conservation of Zephyranthes against Sprekelia would serve nomenclatural stability because the former has been widely used not only by taxonomists but also in horticultural literature (e.g., Huxley & al., New RHS Dict. Gard. 4: 737–738. 1999; Brickell & Cathey, Amer. Hort. Soc. A–Z Encycl. Garden Pl.: 1070. 2004; Brickell, RHS A–Z Encycl. Garden Pl., ed. 4: 1111. 2016), and has already been conserved (Rickett & Stafleu in Taxon 8: 239. 1959; http://botany.si.edu/references/codes/props/index.cfm), while the latter is currently composed of only two species. Hence, adopting the older name would imply publishing over 150 new combinations, versus transferring just two names (Sprekelia formosissima and S. howardii) to Zephyranthes. We believe that the conservation of the name Zephyranthes will better serve the interests of the users of plant classification, and greatly reduce nomenclatural confusion. NG, https://orcid.org/0000-0001-9003-1510; AWM, https://orcid.org/0000-0003-1882-8327; SA-L, https://orcid.org/0000-0002-8670-496X

Tribe

Eudicots

10.1002/tax.12079

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Citations (1)

Phylogenomic Mining of the Mints Reveals Multiple Mechanisms Contributing to the Evolution of Chemical Diversity in Lamiaceae

Molecular Plant (2018)

Benoît Boachon C. Robin Buell Emily Crisovan Natalia Dudareva Nicolás García

Abstract

The evolution of chemical complexity has been a major driver of plant diversification, with novel compounds serving as key innovations. The species-rich mint family (Lamiaceae) produces an enormous variety of compounds that act as attractants and defense molecules in nature and are used widely by humans as flavor additives, fragrances, and anti-herbivory agents. To elucidate the mechanisms by which such diversity evolved, we combined leaf transcriptome data from 48 Lamiaceae species and four outgroups with a robust phylogeny and chemical analyses of three terpenoid classes (monoterpenes, sesquiterpenes, and iridoids) that share and compete for precursors. Our integrated chemical–genomic–phylogenetic approach revealed that: (1) gene family expansion rather than increased enzyme promiscuity of terpene synthases is correlated with mono- and sesquiterpene diversity; (2) differential expression of core genes within the iridoid biosynthetic pathway is associated with iridoid presence/absence; (3) generally, production of iridoids and canonical monoterpenes appears to be inversely correlated; and (4) iridoid biosynthesis is significantly associated with expression of geraniol synthase, which diverts metabolic flux away from canonical monoterpenes, suggesting that competition for common precursors can be a central control point in specialized metabolism. These results suggest that multiple mechanisms contributed to the evolution of chemodiversity in this economically important family.

Chemical space

Terpene

Monoterpene

10.1016/j.molp.2018.06.002

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Citations (115)