Browsing by Title Artículos de revistas
Now showing items 1777-1796 of 4968
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(AMER CHEMICAL SOC, 2005-05-12)Spin forbidden 1,2-cycloadditions of triplet methylene to alkenes have been theoretically studied as an example of the two-state reactivity paradigm in organic chemistry. The cycloadditions of triplet methylene to ethylene ...
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(Sociedad Chilena de Quimica, 2001)In the series of organometallic complexes N3P2(X)5P-SPACER-MLn X= CI and OR, MLn= organometallic fragment, the A31 P-NMR coordination chemical shift parameter correlates with the length of the spacer, decaying exponentially ...
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(University of Szeged, 2018)© 2018, University of Szeged. All rights reserved. In this paper we study a periodic impulsive Hopfield-type neural network system with piecewise constant argument of generalized type. Under general conditions, existence ...
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(2011)A common molecular regulatory pathway that involves PHYA, PHYB and floral integrator genes CONSTANS (CO), FLOWERING LOCUS T (FT) and SUPRESSOR OF OVEREXPRESSION OF CO1 (SOC1) has been suggested to participate in the ...
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(2002)Wnt signalling has been implicated in antero-posterior patterning of the vertebrate embryonic body axis and in a number of other developmental processes. One of the downstream effectors of Wnt signalling is the β-catenin ...
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(1991)Araucaria araucana seeds and seedlings respond to wounding after 48 h with a 3- to 4-fold increase of hydroxyproline-rich glycoproteins (HRGP) in the cell walls of the embryo and with a 15-fold increase in the cell walls ...
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(Springer-Verlag Berlin Heidelberg, 2013)Key message The study determined the tolerance of Aloe vera to high temperature, focusing on the expression of hsp70, hsp100 and ubiquitin genes. These were highly expressed in plants acclimated at 35 C prior to a ...
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(2012)Background: Glutamyl queuosine-tRNAAsp synthetase (GluQ-RS) is a paralog of the catalytic domain of glutamyl-tRNA synthetase and catalyzes the formation of glutamyl-queuosine on the wobble position of tRNAAsp. Here we ...
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(2007)In the yeast Xanthophyllomyces dendrorhous the genes idi, crtE, crtYB, crtI and ast are involved in the biosynthesis of astaxanthin from isopentenyl pyrophosphate. The carotenoid production and the kinetics of mRNA expression ...
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(2001)Sex determination in mammals is controlled by the SRY gene located on the Y chromosome. It encodes a protein containing a DNA-binding and DNA-bending domain. In spite of recent advances in the identification of the mechanisms ...
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(1995)Northern‐blot analysis of RNAs from different tissues demonstrated that the mRNA for the protein kinase CK2α subunit is very abundant in the ovary of Xenopus laevis. The competitive reverse‐PCR technique has been used to ...
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(ACADEMIC PRESS INC ELSEVIER SCIENCE, 2007-12-11)The Hedgehog (Hh) signaling pathway plays critical instructional roles during embryonic development. Misregulation of Hh/Gli signaling is a major causative factor in human congenital disorders and in a variety of cancers. ...
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(2013)Quaternary glaciations in Antarctica drastically modified geographical ranges and population sizes of marine benthic invertebrates and thus affected the amount and distribution of intraspecific genetic variation. Here, we ...
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(John Wiley & Sons, 2013)Quaternary glaciations in Antarctica drastically modified geographical ranges and population sizes of marine benthic invertebrates and thus affected the amount and distribution of intraspecific genetic variation. Here, ...
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(Springer Verlag, 2014)© 2014, The Author(s).There is a consensus that birds detect the earth’s magnetic field and use some of its features for orientation and homing purposes. Since the late 1960s, when the first solid behavioral evidence of ...
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(Society of Biology of Chile, 2002)The neural crest is induced at the border between the neural plate and the epidermis. A complex set of signals is required for the specification of the crest cells between the epidermis and the neural plate. Here we discuss ...
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(2011)In this work is proposed the extraction and determination of oxytetracycline (OTC) and oxolinic acid (OA) in fish feed by first-derivative spectrophotometry. The extractions are carried out by parallel modality, where OTC ...
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(MDPI, 2020)Rising temperatures and increasing drought in Mediterranean-type climate areas are expected to affect plant-pollinator interactions, especially in plant species with specialised pollination. Central Chile experienced a ...
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(SOC Brasileira Ornitología, 2016-06)Nesting birds commonly incorporate feathers into nest linings given their insulation properties. Although use of feathers is common among swallows, here we provide the first recording of nests built almost completely with ...
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(Springer Verlag, 2016)© 2016, The Author(s). Studies of different hypersaline systems have revealed various types of limitation. We evaluated the phototrophic microbial assemblages over a whole seasonal cycle (wet vs dry) in the Salar de Alconcha, ...