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Hernandez T, Rodriguez-Alvarez C, Arevalo MP, Torres A, Sierra A, Arias A. Antimicrobial-resistant Salmonella enterica serovars isolated from chickens in Spain. J Chemother 2002; 14:346-50. [PMID: 12420851 DOI: 10.1179/joc.2002.14.4.346] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
In order to analyze the antibiotic resistance of Salmonella enterica serovars, a total of 112 Salmonella strains were tested (54 S. enteritidis, 32 S. typhimurium, 11 S. heidelberg, 7 S. infantis, 4 S. virchow and 4 S. hadar). The bacteria were isolated from 691 samples of frozen and fresh chicken meat. Identification of microorganisms and antimicrobial sensitivity testing were undertaken by means of the automated MicroScan AutoScan 4 method (Baxter in Spain). 45.5% of 112 strains tested were susceptible to all antibiotics. The highest percentage of resistance was found to: chloramphenicol (44.6%), ampicillin (34.8%) and tetracycline (33.9%). Multiple resistance was observed in 49 strains (43.7%), whereas single resistance was seen in 12 isolates (10.7%). We found 12 different patterns of resistance in Salmonella enterica serovar enteriditis. Resistance to chloramphenicol was the most common single resistance. The most frequent patterns of multiresistant strains were ampicillin + amoxicillin/clavulanate + cefazolin + imipenem and chloramphenicol + impipenem. In this serotype, 49 isolates belonged to phagetype 4. Salmonella typhimurium showed the highest percentages of resistance to the tested drugs, with six different resistance patterns found. 25 strains out of 32 S. typhimurium isolates belonged to phagotype 120 and 13 of these showed the same resistance pattern: chloramphenicol + tetracycline + ampicillin. The high incidence of antibiotic resistant salmonellae found in chickens in our study suggests the need for public health interventions to decrease selective pressure on bacterial strains by antimicrobial agents.
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Pascual JA, Garcia C, Hernandez T, Lerma S, Lynch JM. Effectiveness of municipal waste compost and its humic fraction in suppressing Pythium ultimum. MICROBIAL ECOLOGY 2002; 44:59-68. [PMID: 12187376 DOI: 10.1007/s00248-001-0040-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2001] [Accepted: 09/27/2001] [Indexed: 05/23/2023]
Abstract
The effect of addition of a municipal solid waste (MSW) compost and its water-soluble and humic fraction to suppress the effect of Pythium ultimum on pea plants was studied and compared with that of a chemical pesticide (metalaxyl). The biotic and abiotic characteristics of compost involved in the biocontrol effects of these materials were also evaluated. The addition into soil of whole composts and their humic fractions reduced the effect of the pathogen on pea plants, significantly reducing the number of root lesions and Pythium populations and avoiding reductions of plant growth. The greatest pathogen suppression was achieved with the chemical pesticide. However, it also caused a significant decrease in the number of nontarget bacteria and fungi and on beneficial soil microorganisms such as Trichoderma and Pseudomonas. Addition of organic amendments increased population size of nontarget and specific biocontrol microorganisms. The humic fraction showed similar results to compost. All this suggests that metalaxyl has a nonspecific effect, producing adverse effects on aspects of soil quality. This was avoided if the chemical pesticide was reduced and replaced by organic amendments such as an MSW compost or its humic fraction.
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Juskiewicz J, Zdunczyk Z, Wroblewska M, Oszmianski J, Hernandez T. The response of rats to feeding with diets containing grapefruit flavonoid extract. Food Res Int 2002. [DOI: 10.1016/s0963-9969(01)00184-3] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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de la Cruz RA, Albillos JC, Oliver JM, Dhimes P, Hernandez T, Trapero MA. Prolapsed hyperplastic gastric polyp causing pancreatitis: case report. ABDOMINAL IMAGING 2001; 26:584-6. [PMID: 11907720 DOI: 10.1007/s00261-001-0014-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
A huge hyperplastic gastric polyp prolapsed into the duodenum. The compression and obstruction of the ampulla of Vater by this polyp caused acute pancreatitis. An overview of imaging findings, general considerations about hyperplastic gastric polyps, and a review of the literature are provided.
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Hainaut P, Hernandez T, Robinson A, Rodriguez-Tome P, Flores T, Hollstein M, Harris CC, Montesano R. IARC Database of p53 gene mutations in human tumors and cell lines: updated compilation, revised formats and new visualisation tools. Nucleic Acids Res 1998; 26:205-13. [PMID: 9399837 PMCID: PMC147235 DOI: 10.1093/nar/26.1.205] [Citation(s) in RCA: 343] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Since 1989, about 570 different p53 mutations have been identified in more than 8000 human cancers. A database of these mutations was initiated by M. Hollstein and C. C. Harris in 1990. This database originally consisted of a list of somatic point mutations in the p 53 gene of human tumors and cell lines, compiled from the published literature and made available in a standard electronic form. The database is maintained at the International Agency for Research on Cancer (IARC) and updated versions are released twice a year (January and July). The current version (July 1997) contains records on 6800 published mutations and will surpass the 8000 mark in the January 1998 release. The database now contains information on somatic and germline mutations in a new format to facilitate data retrieval. In addition, new tools are constructed to improve data analysis, such as a Mutation Viewer Java applet developed at the European Bioinformatics Institute (EBI) to visualise the location and impact of mutations on p53 protein structure. The database is available in different electronic formats at IARC (http://www.iarc. fr/p53/homepage.htm ) or from the EBI server (http://www.ebi.ac.uk ). The IARC p53 website also provides reports on database analysis and links with other p53 sites as well as with related databases. In this report, we describe the criteria for inclusion of data, the revised format and the new visualisation tools. We also briefly discuss the relevance of p 53 mutations to clinical and biological questions.
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Dogliotti E, Hainaut P, Hernandez T, D'Errico M, DeMarini DM. Mutation spectra resulting from carcinogenic exposure: from model systems to cancer-related genes. Recent Results Cancer Res 1998; 154:97-124. [PMID: 10026995 DOI: 10.1007/978-3-642-46870-4_6] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
The events leading to cancer are complex and interactive. Alteration of cancer genes, such as the tumor suppressor gene p53, plays a central role in this process. Analysis of the frequency, type and site of mutations in important cancer-related genes may provide clues to the identification of etiological factors and sources of exposure. In this chapter we have selected a few examples of environmental human carcinogens and have attempted to use the knowledge of their mechanisms of mutagenesis, as derived from in vitro cell systems, as a key to understanding the complexity of p53 mutation spectra in tumors arising at the putative target organ. The analysis will focus on environmental exposure to UV radiation. The examples of tobacco smoke, dietary aflatoxin and vinyl chloride will be also briefly discussed.
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Castillo G, Sanz MA, Serrano MA, Hernandez T, Hernandez A. An Isocratic High-Performance Liquid Chromatographic Method for Determining the Available Lysine in Foods. J Chromatogr Sci 1997. [DOI: 10.1093/chromsci/35.9.423] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Hernandez T, Auśn N, Bartolomé B, Bengoechea L, Estrella I, Gómez-Cordovés C. Variations in the phenolic composition of fruit juices with different treatments. ACTA ACUST UNITED AC 1997. [DOI: 10.1007/s002170050052] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Villoria MF, de la Torre J, Fortea F, Munoz L, Hernandez T, Alarcón JJ. Intracranial tuberculosis in AIDS: CT and MRI findings. Neuroradiology 1992; 34:11-4. [PMID: 1553031 DOI: 10.1007/bf00588425] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
CT and MRI findings in 35 patients with the acquired immune deficiency syndrome (AIDS) and proven intracranial tuberculosis (TB) are presented. Over 90% of the patients were intravenous drug abusers and in two-thirds TB was the first manifestation of AIDS. CT was normal in one quarter, the most frequent findings being hydrocephalus (51%) and meningeal enhancement (41%), commonly seen together (31.5%). Meningeal enhancement was seen in 48% of the CT studies with intravenous contrast medium and in 3 cases studied with MRI and i.v. gadolinium DTPA, in 2 of which CT was negative. Parenchymal involvement was found in 37% of cases; MRI was more sensitive than CT for its detection. One quarter of the patients had ischaemic lesions, mainly in the basal ganglia. We confirm the usefulness of CT and the superiority of MRI in the diagnosis of intracranial TB and in differential diagnosis from other conditions likely to be found in these patients.
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Correa-Gorospe I, Polo M, Hernandez T. Characterization of the proteic and the phenolic fraction in tartaric sediments from wines. Food Chem 1991. [DOI: 10.1016/0308-8146(91)90041-l] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Coulson RA, Hernandez T. Decreased oxygen consumption after catecholamine-induced glycolysis in the alligator. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY. A, COMPARATIVE PHYSIOLOGY 1986; 84:673-6. [PMID: 2875834 DOI: 10.1016/0300-9629(86)90385-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Anaerobic glycolysis was stimulated by forcing alligators to work to exhaustion, or by injecting them with epinephrine or norepinephrine. In all three groups, plasma lactate increased to above 20 mM. In the work group, oxygen consumption increased three-fold. In the catecholamine experiments, oxygen consumption dropped almost to zero immediately and stayed at zero from 45 min to over 2 hr. Gradually oxygen consumption resumed, finally exceeding the control value, but only by 50%. It was concluded that catecholamine-induced glycolysis produced phosphate-bond energy greatly in excess of immediate need, and that this energy was stored until it was used by the tissue. No oxygen was used until the store was depleted.
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Davis D, Schwarz P, Hernandez T, Mitchell M, Warnock B, Elbein AD. Isolation and Characterization of Swainsonine from Texas Locoweed (Astragalus emoryanus). PLANT PHYSIOLOGY 1984; 76:972-5. [PMID: 16663983 PMCID: PMC1064418 DOI: 10.1104/pp.76.4.972] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Swainsonine (1,2,8-trihydroxyoctahydroindolizine) was isolated from locoweed (Astragalus emoryanus) that grows in Texas. Using a biological assay as a measure of activity and purity, a relatively straightforward purification of the compound is described. The purified material was a potent inhibitor of jack bean alpha-mannosidase and also of glycoprotein processing. The positive ion electron impact mass spectra of this compound was identical to that of authentic swainsonine. Nuclear magnetic resonance analysis also confirmed that the material was swainsonine.
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Hoffer PB, Neumann R, Quartararo L, Lange R, Hernandez T. Improved intrinsic resolution: does it make a difference? Concise communication. J Nucl Med 1984; 25:230-6. [PMID: 6327944] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
The purpose of this study was to determine what effect further improvement in an Anger camera's intrinsic resolution has on lesion detection. We studied 52 patients undergoing bone imaging and 58 undergoing liver imaging. All patients had images performed in rapid sequence on ZLC -75 and ZLC -37 Anger cameras, both by Siemens. The two imaging systems are virtually identical except for the number of photomultiplier tubes and crystal thickness; these resulted in differences in intrinsic resolution ( ZLC -75 less than 3.8 mm FWHM at 140 keV, ZLC -37 less than 4.9 mm) and sensitivity ( ZLC -75 approximately 0.91 of ZLC -37 at 140 keV). Observer performance, measured by ROC curves, for detection of abnormalities was virtually identical with the two instruments. Subjectively, there was a trend toward preference of the ZLC -75 images, but this was not associated with any significant improvement in lesion detectability even in the subgroup in which a preference for one or the other instrument was noted.
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Coulson RA, Hernandez T. Amino acid transport in the intestine of the caiman. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY. A, COMPARATIVE PHYSIOLOGY 1983; 75:407-12. [PMID: 6136376 DOI: 10.1016/0300-9629(83)90102-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Seventeen amino acids were fed singly to small caimans and the rates of their disappearance from the gut lumen, and of their appearance in intestinal mucosa, whole intestine, whole stomach, and plasma were determined. The results were compared with those in which massive amounts of protein were fed. When single amino acids were fed, only traces of arginine, ornithine, lysine, aspartate and asparagine were absorbed intact. Glycine, alanine and serine were absorbed rapidly reaching mucosal concentrations as high as 40 mM. The others were not concentrated as highly and most were absorbed by the mucosa more slowly than the glycine group. Protein feeding did not result in high amino acid concentrations in the mucosa. Whether amino acids were ingested as protein or in the free state, glycine, alanine and glutamine increased in the mucosa, suggesting these three incorporate nitrogen released from the others. It appeared that several transport systems operate if amino acids are given singly, and that a different more efficient transport system operates during protein digestion.
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Coulson RA, Hernandez T. Alligator Metabolism. Studies On Chemical Reactions In Vivo. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY. B, COMPARATIVE BIOCHEMISTRY 1983; 74:1-182. [PMID: 6831860 DOI: 10.1016/0305-0491(83)90418-2] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Erdman HE, Hernandez T. Adult toxicity and dominant lethals induced by ozone at specific stages in spermatogenesis in Drosophila virilis. ENVIRONMENTAL MUTAGENESIS 1982; 4:657-66. [PMID: 7160344 DOI: 10.1002/em.2860040605] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Ozone, a highly reactive three-atom allotrope of oxygen, is formed in high concentrations in various kinds of microenvironments, including electron microscopes, office copy machines, and X-ray devices. Mutagenicity and action modus operandi of ozone suggest its radiomimetic property. In order to test for ozone-induced dominant lethals in Drosophila virilis, we determined that four-hr and longer exposures to 30 +/- 2 ppm ozone were lethal on or before day 25 postexposure. Accordingly, we used a three-hr ozone exposure to investigate dominant lethals induced at specific spermatogenic stages. Ozone increased the percentage of dominant lethals in the stages of spermatogenesis which were investigated. Under the conditions of this experiment, the sperm-sperm bundle stage showed the greatest percentage of dominant lethals induced by ozone. Meiotic cells were the least sensitive to ozone mutagenicity. The induction of dominant lethals is discussed on the basis of chemical reactions from the molecular decomposition of water by radiations and/or ozone. Alternative explanations are presented due to the definition of induced dominant lethals and to associated modifications from ozone exposure.
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Guarneros G, Montañez C, Hernandez T, Court D. Posttranscriptional control of bacteriophage lambda gene expression from a site distal to the gene. Proc Natl Acad Sci U S A 1982; 79:238-42. [PMID: 6281759 PMCID: PMC345701 DOI: 10.1073/pnas.79.2.238] [Citation(s) in RCA: 88] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
The bacteriophage lambda int gene product, integrase, recombines the phage DNA with the host DNA at specific sites on each to accomplish lysogeny. The int gene is transcribed from two promoters, PL and PI, each regulated positively by lambda proteins. The expression of integrase is also controlled from a site, sib, in the b region of the phage genome. This is a unique regulatory site because it is located distal to the structural gene in relation to the promoters. The expression of int from the PL promoter is inhibited when sib is present. This effect appears to be specific for PL because sib does not cause inhibition of PI-dependent int synthesis. lambda mutants that contain alterations in the site have been isolated. Sequence analyses of the mutations reveal single base changes, spanning 37 base pairs (bp) in the b region, some 240 bp beyond the int gene. Another mutant, hef13, which has a phenotype similar to that of sib, introduces a nucleotide change within the same 37-bp region. The sib and hef mutations cluster within a region of dyad symmetry. Regulation of int synthesis by sib occurs after transcription of the int gene. There is no difference in the rate of PL-promoted int mRNA synthesis in either sib+ or sib- phage infections, yet int mRNA is less stable in the sib+ infection. Because RNase III host mutants are defective in sib regulation, processing of the PL mRNA at sib by this endoribonuclease may cause int mRNA decay and decrease int synthesis.
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Binkley S, Muller G, Hernandez T. Circadian rhythm in pineal N-acetyltransferase activity: phase shifting by light pulses (I). J Neurochem 1981; 37:798-800. [PMID: 7276958] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
N-Acetyltransferase activity (NAT) in the pineal gland has a circadian rhythm which is responsive to environmental light-dark cycles. The rhythm entrains to (synchronizes with or is phased by) light-dark cycles. To assess the means by which phase resetting is accomplished, the phase response of the pineal NAT rhythm to light pulses was examined using chicks (Gallus domesticus). When 4-h light pulses were imposed on chicks at intervals over a 24-h period of darkness and the time of the next rise in NAT was determined in darkness, it was found that: (1) pulses early in the subjective dark time delayed the rise in NAT, (2) pulses late in the subjective dark time advanced the rise in NAT, and (3) pulses in the subjective light time were relatively ineffective. These results are typical of a circadian phase response curve and show that an enzyme with a circadian rhythm is similar to other circadian rhythms studied.
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Miller HI, Abraham J, Benedik M, Campbell A, Court D, Echols H, Fischer R, Galindo JM, Guarneros G, Hernandez T, Mascarenhas D, Montanez C, Schindler D, Schmeissner U, Sosa L. Regulation of the integration-excision reaction by bacteriophage lambda. COLD SPRING HARBOR SYMPOSIA ON QUANTITATIVE BIOLOGY 1981; 45 Pt 1:439-45. [PMID: 6271488 DOI: 10.1101/sqb.1981.045.01.058] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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46
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Coulson RA, Hernandez T. Increase in metabolic rate of the alligator fed proteins or amino acids. J Nutr 1979; 109:538-50. [PMID: 430258 DOI: 10.1093/jn/109.4.538] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Energy required for protein digestion, amino acid absorption and transport, and for protein synthesis in the alligator was estimated by determining oxygen consumption following feeding of single amino acids, various amino acid mixtures, fish, casein, gelatin, zein, and a gelatin hydrolysate. Results suggested a low energy requirement for protein digestion, for absorption of the released amino acids, and for amino acid transport, and a high energy requirement for protein synthesis. Little energy was needed for absorption and transport of neutral single amino acids but absorption of single ionic amino acids appeared to require energy. The alligator's metabolic rate is so low that processes requiring extra energy increased oxygen consumption as much as 300%. Peptide bond synthesis seems to have been responsible for the 3-fold increase in metabolic rate after feeding protein. Whether that phenomenon should be called "specific dynamic action" is problematical.
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Herbert JD, Coulson RA, Hernandez T, Ehrensvärd G. A carbonic anhydrase requirement for the synthesis of glutamine from pyruvate in the chameleon. Biochem Biophys Res Commun 1975; 65:1054-60. [PMID: 808224 DOI: 10.1016/s0006-291x(75)80492-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Hernandez T, Coulson RA, Herbert JD. Synthesis of renal ammonium bicarbonate from 14C labeled amino acids in crocodilia. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY. B, COMPARATIVE BIOCHEMISTRY 1973; 46:417-25. [PMID: 4757959 DOI: 10.1016/0305-0491(73)90332-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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49
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Coulson RA, Hernandez T. Reptiles as research models for comparative biochemistry and endocrinology. J Am Vet Med Assoc 1971; 159:1672-7. [PMID: 4949440] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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Coulson RA, Hernandez T. Catabolic effects of cycloheximide in the living reptile. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY. B, COMPARATIVE BIOCHEMISTRY 1971; 40:741-9. [PMID: 5133343 DOI: 10.1016/0305-0491(71)90149-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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