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Arginine: New and Exciting Developments for an“Old”Amino Acid

Biomedical and Environmental Sciences 1996年第2期9卷 296-315页

作者： LOUIS BEAUMIER leticia castillo YONG-MING YU ALFRED M. AJAMI AND VERNON R. YOUNG(Laboratory of Human Nutrition, School of Science, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA Shriners Burns Institute,Boston, MA, 02114 USA mass Tra Laboratory of Human Nutrition School of Science Massachusetts Institute of Technology Cambridge 02139 USA.

Arginine (2-amino-5-guanidino pentanoic acid) was shown in 1895 by Hedin to be present in the proteins of horn. Metabolic nitrogen balance studies, conducted in 1957 by Rose in human adults and in 1959 by Snyderman and coworkers in young infants, revealed that a dietary source of this amino acid was not an obligatory requirement for growth and maintenance of nitrogen homeostasis in healthy individuals. Hence, It was initially classified as a non-essential (dispensable) amino acid and, perhaps, for reasons of this classification arginine did not receivc the earlier atteniion it now deserves, in relation to an understanding of the nutritional biochemistry and physiology of its metabolism in humans subjects. However, there is currently a considerable interest in the cellular and tissue functions, as well as clinical, therapeutic significance, of arginine. In this paper we review the multiple functions of arginlne, including its role in the L-arginine-nitric oxide pathway,cellular regeneration, immune function, protein synthesis and protein breakdown. We then consider some in vivo aspects of the physiology of arginine metabolism, which varies greatly among eukaryotes, with particular reference to humans. Against this background, studies of arginine in the nutrition of humans under various pathophysiological conditions are reviewed briefly. Finally, a new, updated concept for the metabolic basis for the 'conditional essentiality' of arginine is proposed

关键词： Amino Acid USA Old Arginine New and Exciting Developments for an

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Effects of Hedera helix L. removal on the understory early regeneration in an oak temperate forest in Mexico City

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Ecological Processes 2023年第3期12卷 3-14页

作者： Héctor Adrián Jiménez-Hernández leticia Bonilla-Valencia Yuriana Martínez-Orea Mara Jessica Zamora-Almazan Francisco Javier Espinosa-García Silvia castillo-Argüero Facultad de Ciencias Universidad Nacional Autónoma de México Instituto de Investigaciones en Ecosistemas y Sustentabilidad Universidad Nacional Autónoma de México

Background Hedera helix L. is an invasive weed species introduced in several regions of the world, so it is relevant to study its effects on the plant community and the changes occurring after its eradication. We established invaded(with/without removal of H. helix) and non-invaded(with/without removal of the understory) plots to compare some community attributes in an oak forest in Mexico City and monitored them every 2 months for 1 year, taking soil samples to compare some edaphic variables between the plots. If invasive species negatively affect natural regeneration, seedlings of native species would be less abundant in plots invaded by H. helix than in the non-invaded ones. As invasive species modify the soil microbiota through exudates and often allelochemicals, soil chemical variables would differ between invaded and non-invaded *** The abundance of native species was lower in the invaded plots, but the richness and diversity of species were not statistically different. The composition of the two invaded plots was similar to each other and more alike to that of the non-invaded plots. The species composition of the invaded plots was associated with soil potassium and phosphorus concentrations, whereas that of the non-invaded plots was more associated with soil nitrogen *** Following the removal of H. helix, several native species were registered, leading to a similar species composition as in the non-invaded plots, suggesting that some vegetation recovery can be expected following H. helix removal in 1 year.

关键词： Ivy Invasive plant Mechanical control Diversity Species composition

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Effects of Hedera helix L. removal on the understory early regeneration in an oak temperate forest in Mexico City

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Ecological Processes 2023年 438-449页

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Global longitudinal strain is superior to ejection fraction for detecting myocardial dysfunction in end-stage renal disease with hyperparathyroidism

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World Journal of Cardiology 2022年第4期14卷 239-249页

作者： Maria Fernanda Carrasco-Ruiz Antonio Ruiz-Rivera Marvin A Soriano-Ursúa Carlos Martinez-Hernandez leticia Manuel-Apolinar Carmen castillo-Hernandez Gustavo Guevara-Balcazar Eunice D Farfán-García Ana Mejia-Ruiz Ivan Rubio-Gayosso Teresa Perez-Capistran Department of Physiology Escuela Superior de MedicinaInstituto Politécnico NacionalCiudad de México 11340Mexico Department of Cardiology Instituto Mexicano del Seguro SocialCiudad de México 06720Mexico Endocrine Research Unit Instituto Mexicano del Seguro SocialCiudad de México 06720Mexico Department of Cardiovascular Pharmacology Instituto Politécnico NacionalCiudad de México 11340Mexico Department of Biochemistry Escuela Superior de MedicinaInstituto Politécnico NacionalCiudad de México 11340Mexico Education Research Comisión Nacional Para la Mejora Continua de la EducaciónCiudad de México 03900Mexico Postgraduate Studies and Research Section Escuela Superior de MedicinaInstituto Politécnico NacionalCiudad de México 11340Mexico Department of Physiology Instituto Politécnico NacionalMexico City 11340Ciudad de MéxicoMexico

BACKGROUND The estimation of left ventricular ejection fraction(LVEF)by 2D echocardiography(2D-ECHO)is the most used tool to assess LV systolic function(LVSF).Global longitudinal strain(GLS)has recently been suggested as a superior method for several *** study explored the association and prevalence of LV systolic dysfunction(LVSD)by using these methods in patients with end-stage renal disease(ESRD)and severe hyperparathyroidism(SHPTH);both associated with cardiovascular events(CEs).AIM To evaluate the myocardial function in patients with ESRD and SHPTH by using the GLS and LVEF measured through conventional *** In 62 patients with ESRD and SHPTH,asymptomatic,and without a history of CEs,LVSF was evaluated by 2D-ECHO,obtaining the EF,by the Simpson biplane method,and GLS by speckle *** The total patients with ESRD had a preserved LVEF(>50%)but abnormal GLS(<13.55%).Additionally,multivariate analysis showed an independent association of GLS and serum parathyroid hormone(PTH),LV mass index,and ***,PTH was independently associated with lateral e'wave and tricuspid regurgitation *** In patients with SHPTH linked to ESRD,the use of GLS by 2D-ECHO is a more sensitive tool than LVEF for detecting LVSD.

关键词： Left ventricular hypertrophy Systolic dysfunction Global longitudinal strain End-stage renal disease Parathormone

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Effect of Nutrimental Stress on the Pigment Content of the Heliophytic Poinsettia （Euphorbia Pulcherrima cv. Valenciana）

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Journal of Agricultural Science and Technology(A) 2012年第6期2卷 833-839页

作者： Yolanda leticia Femandez-Pavia Maria Teresa B. Colinas-Leon Rogelio Castro-Brindis Tito Rojas Roque Gustavo Adolfo Baca-castillo Departamento de Fitotecnia Instituto de Horticultura Universidad Autonoma Chapingo Texcoco Estado de Mdxico C.P. 56230Mexico Especialidad de Edafologla- Nutrici6n Vegetal Colegio de Postgraduados Campus Montecillo C.P. 56250 Texcoco Estado de Mexico

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