331 documentos corresponden a la consulta.
Palabras contadas: nonhuman: 331
Zorreguieta, A. - Ugalde, R.A.
J. BACTERIOL. 1986;167(3):947-951
1986
Temas: beta 1,2 glucan - polysaccharide - protein - unclassified drug - article - nonhuman - Rhizobium - Agrobacterium - Rhizobium
Descripción: Fil:Zorreguieta, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
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Mola, L.M.
Hereditas 1995;122(1):47-55
1995
Temas: animal cell - article - chromosome bivalent - chromosome pairing - insect - male - meiosis - nonhuman - spermatogonium
Descripción: In many groups of insects with holokinetic chromosomes the meiotic process is, without doubt, either pre‐reductional or post‐reductional. In Odonata, however, the mode of orientation (axial or equatorial) and type of meiosis (pre‐ or post‐reductional) of bivalents is still controversial. Copyright © 1995, Wiley Blackwell. All rights reserved
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Sintas, J.A. - Macareno, N.J. - Vitale, A.A.
Molecules 2000;5(3):526-528
2000
Temas: 8 dihydroxyborylharmine b 10 - radiopharmaceutical agent - unclassified drug - animal tissue - autoradiography - binding site - conference paper - drug distribution - drug structure - drug synthesis
Descripción: We have described a method for preparation of [10B]-enriched-8- dihydroxyborylharmine (III) and characterized it by their spectral properties (MS, IR and NMR). This compound is a potential BNCT agent.
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Levy, L.M. - Cabrera, G.M. - Wright, J.E. - Seldes, A.M.
Molecules 2000;5(3):354-355
2000
Temas: antiinfective agent - triterpene derivative - antimicrobial activity - conference paper - cytotoxicity - drug activity - drug identification - drug isolation - drug screening - fungus culture
Descripción: A screening of metabolites guided by antimicrobial and citotoxic bioassays was conducted with several fungi. The bioactive compounds were isolated and identified from the active extracts.
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Cueto, P.H. - Mendez, B.S.
APPL. ENVIRON. MICROBIOL. 1990;56(2):578-580
1990
Temas: acetic acid - bromate - bromide - solvent - article - bacterium mutant - clostridium acetobutylicum - fermentation - methodology - nonhuman
Descripción: Clostridium acetobutylicum ATCC 10132 mutants altered in acetic acid synthesis or in the shift to solventogenesis were directly selected by a proton suicide method after mutagenic treatment, by using bromide and bromate as selective agents. The mutants were characterized according to their solvent and acid production. On the selection plates they differed in colony phenotype from the parent strain.
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Díaz De Vivar, M.E. - Maier, M.S. - Seldes, A.M.
Molecules 2000;5(3):350-351
2000
Temas: labidiasteroside a - saponin - unclassified drug - Asterias - conference paper - drug isolation - drug structure - Labidiaster annulatus - nonhuman - structure analysis
Descripción: Purification of the ethanolic extract of the starfish L. annulatus led to the isolation of two sulfated glycosides and a pentahydroxylated steroid. One of the saponins contains a novel pentasaccharide chain attached to C-6 of the steroidal aglycone.
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Caceres, J.F. - Krainer, A.R. - Kornblihtt, A.R.
EMBO Rep. 2007;8(8):730-734
2007
Temas: arginine - messenger RNA - protein - serine - transcription factor - alternative RNA splicing - cancer - conference paper - gene expression - gene mutation
Descripción: Fil:Caceres, J.F. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
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Maier, M.S. - Araya, E. - Seldes, A.M.
Molecules 2000;5(3):348-349
2000
Temas: hydroxysteroid - animal tissue - carbon nuclear magnetic resonance - conference paper - drug isolation - echinoderm - extraction - fast atom bombardment mass spectrometry - Gorgonocephalus chilensis - nonhuman
Descripción: Five disulfated steroids and a mixture of monosulfated steroids were isolated from the ethanolic extract of the antarctic ophiuroid Gorgonocephalus chilensis. The structures were determined by 1H-NMR, 13C-NMR and FABMS.
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Geremia, R.A. - Cavaignac, S. - Zorreguieta, A. - Toro, N. - Olivares, J. - Ugalde, R.A.
J. BACTERIOL. 1987;169(2):880-884
1987
Temas: polysaccharide - article - heredity - higher plant - mutant - nonhuman - priority journal - Sinorhizobium meliloti - Agrobacterium tumefaciens - Embryophyta
Descripción: A mutant of Rhizobium meliloti that elicited the formation of inactive nodules in alfalfa was found not to form β-(1→2) glucan in vivo or in vitro. It was nonmotile because it lacks flagella. The 235-kilodalton protein which acts as an intermediate in β-(1→2) glucan synthesis was undetectable in the mutant. These properties of the mutant are common to those of chvB mutants of Agrobacterium tumefaciens. Exopolysaccharide formation by the R. meliloti mutant was about double that by the wild type.
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Rosso, M.L. - Maier, M.S. - Bertoni, M.D.
Molecules 2000;5(3):345-347
2000
Temas: roridina a - roridina e - toxin - trichothecene - unclassified drug - verrucarina a - verrucarina j - Baccharis - Baccharis coridofolia - conference paper
Descripción: Cultures of the fungus epibiont from the herbaceous shrub B. coridifolia yielded four macrocyclic trichothecenes. As these toxins are the same as those found in B. coridifolia, the relationship between the plant and the epibiont must be considered as mutualistic.
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Urbina, J.A. - Concepcion, J.L. - Montalvetti, A. - Rodriguez, J.B. - Docampo, R.
Antimicrob. Agents Chemother. 2003;47(6):2047-2050
2003
Temas: 4 phenoxyphenoxyethyl thiocyanate - antiprotozoal agent - squalene synthase - sterol - unclassified drug - wc 9 - antiprotozoal activity - article - Chagas disease - controlled study
Descripción: We investigated the molecular basis of the activity of 4-phenoxyphenoxyethyl thiocyanate (WC-9) against Trypanosoma cruzi, the etiological agent of Chagas' disease. We found that growth inhibition of T. cruzi epimastigotes induced by this compound was associated with a reduction in the content of the parasite's endogenous sterols due to a specific blockade of their de novo synthesis at the level of squalene synthase.
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Farias, M.E. - Revale, S. - Mancini, E. - Ordoñez, O. - Turjanski, A. - Cortez, N. - Vazquez, M.P.
J. Bacteriol. 2011;193(14):3686-3687
2011
Temas: arsenic - sodium chloride - alkalinity - altitude - altitude disease - bacterium isolation - gene sequence - lake - nonhuman - note
Descripción: The high-altitude Andean lakes (HAAL) in the Argentinean Puna-high Andes region represent an almost unexplored ecosystem exposed to extreme conditions (high UV irradiation, hypersalinity, drastic temperature changes, desiccation, and high pH). Here we present the first genome sequence, a Sphingomonas sp., isolated from this extreme environment. © 2011, American Society for Microbiology.
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Battista, M.E. - Vitale, A.A. - Pomilio, A.B.
Molecules 2000;5(3):489-490
2000
Temas: cyclopeptide - fungal protein - toxic substance - ab initio calculation - Amanita phalloides - carbon nuclear magnetic resonance - conference paper - empiricism - hydrogen bond - molecular interaction
Descripción: The electronic structures and conformational studies of the cyclopeptides, O-methyl-α-amanitin, phalloidin and antamanide, were obtained from molecular parameters on the basis of semiempiric and ab initio methods.
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Tettamanzi, M.C. - Veleiro, A.S. - De La Fuente, J.R. - Burton, G.
Molecules 2000;5(3):449-450
2000
Temas: carbon - plant extract - proton - salpichrolide - unclassified drug - withanolide - carbon nuclear magnetic resonance - chemical structure - conference paper - controlled study
Descripción: From the aerial parts of Salpichroa origanifolia a new withanolide in which the C-13 angular methyl has migrated to C-17, was isolated and characterized by spectroscopic methods.
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Rosenfeldt, S. - Galati, B.G.
Biocell 2008;32(1):41-47
2008
Temas: Embryology - Orbicules - Oxalis - Pollen - Taxonomy - angiosperm - Argentina - article - biodiversity - controlled study
Descripción: Eleven Oxalis L. species from the province of Buenos Aires (Argentina) were investigated with scanning and transmission electron microscopes. We identified four different types and two subtypes of orbicules. We conclude that the close morphological similarity between these species is also reflected in their orbicules, and we suggest that the orbicules morphology may be a useful character in systematic studies.
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Cirigliano, A.M. - Veleiro, A.S. - Oberti, J.C. - Burton, G.
Molecules 2000;5(3):441-442
2000
Temas: jaborosa odonelliana extract - plant extract - unclassified drug - withanolide - animal cell - antineoplastic activity - carbon nuclear magnetic resonance - conference paper - controlled study - jaborosa odonelliana
Descripción: From whole Jaborosa odonelliana plants four new withanolides containing a spiranic lactone in the side chain, were isolated and their structures elucidated by spectroscopic methods.
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Parada, J.L. - La Via, M.I. - Solari, A.J.
APPL. ENVIRON. MICROBIOL. 1984;47(6):1352-1354
1984
Descripción: Phages may cause lysis of lactic acid bacteria used in cheese production. Three virulent bacteriophages specific for Streptococcus lactis subsp. lactis C2 were isolated and purified from cheese whey. They showed distinct plaque sizes, and although they had similar morphology by electron microscopy examination, their dimensions were slightly different. The phage heads were elongated and hexagonal in shape, and the flexible tails appeared periodically cross-striated. They were DNA phages based on the acridine orange test. On infection, phage was adsorbed on the bacterial surface by the free end of the tail. After 80 min of incubation at 25°C, the phage heads appeared empty, slightly collapsed, and possessed a visible hollow tube through which the genetic material had been injected.
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Rosenfeldt, S. - Galati, B.G.
Biocell 2005;29(3):271-278
2005
Temas: Ontogeny - Oxalis - Pollen - Ubisch bodies - Ultrastructure - lipid - sporopollenin - unclassified drug - article - cell ultrastructure
Descripción: The correlation between the ontogeny of Ubisch bodies and pollen development in Oxalis articulata was studied with Transmission Electron Microscopy (TEM). The ultrastructural changes observed during the different stages of development in the tapetal cells are related to Ubisch bodies, sporopollenin and pollen-kitt formation. The pro-orbicules have the appearance of lipid globuli and their formation is related to the endoplasmic reticulum of rough type (ERr). The lipid globules or pro-orbicules disappear in the mature Ubisch bodies, and the places that they occupied remain free of contents or with pollen-kitt.
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Briozzo, J. - Amato de Lagarde, E. - Chirife, J. - Parada, J.L.
APPL. ENVIRON. MICROBIOL. 1986;51(4):844-848
1986
Temas: botulinum toxin - water - activity - bacterial growth - clostridium botulinum type g - nonhuman - ph - priority journal - Botulinum Toxins - Clostridium botulinum
Descripción: The combined effect of water activity (a(w)) and pH on growth and toxin production by Clostridium botulinum type G strain 89 was investigated. The minimum a(w) at which growth and toxin formation occurred was 0.965, for media in which the pH was adjusted with either sodium chloride or sucrose. The minimum pH (at the optimum a(w)) for growth and toxin production of C. botulinum type G was found to be 5.6. Optimum conditions for toxin activation were a trypsin concentration of 0.1%, a pH of the medium of 6.5, and an incubation for 45 min at 37° C. These data did not show evidence of heat-labile spores, since a heat shock of 75°C for 10 min did not significantly decrease the spore count of strain 89G in media at pH 7.0 or 5.6. It was frequently observed that cells grown at reduced a(w) or pH experienced severe morphological changes.
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