15 research outputs found

    Manejo de fertilización nitrogenada sobre los componentes del rendimiento de triticale

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    Nitrogen fertilization is one of the most important factors in the growth and development of cereal crops impact. This study aimed to determine the effect of split application of nitrogen in different growth stages of two cultivars of triticale (X Triticosecale Wittmack), and its relationship with crop yield and its components. The culture was established in the village of Lerma, State of Mexico, during the winter-spring cycles (W-S) and summer-autumn (S-A) for the period 2012-2013. The evaluated cultivars were Siglo-TCL21 and Bicentenario with two doses of N in W-S (0 and 150 kg ha-1) and three doses S-A (0, 150 and 250 kg ha-1). Nitrogen (N) was fractionated into three stages of crop development: tillering (TI), terminal spikelet (TS) and flag leaf (FL). The dose of 150 was divided into: 1/3 TI, 1/3 TS and 1/3 FL, 1/2 TI and 1/2 TS and everything in TI; the dose of 250 was divided into: 2/5TI, 2/5 TS and 1/ 5 FL, 2/5 TI and 3/5 TS. The experimental design was a randomized complete array blocks. The cultivar Bicentenario showed higher number of grains and Siglo-TCL21 higher weight of grain. With the dose of 250 kg N ha-1 values and biomass yield in both cultivars increased. Maximum yields for cultivars Bicentenatio and Siglo-TCL21 were obtained with 250 kg ha-1 when it was fractionated into 2/5 TI and 3/5 TS.La fertilización nitrogenada es uno de los factores de impacto más importantes en el crecimiento y desarrollo de los cultivos de cereales. Esta investigación tuvo como objetivo, determinar el efecto de la aplicación fraccionada de nitrógeno en diferentes estados fenológicos de dos cultivares de triticale (X Triticosecale Wittmack), y su relación con el rendimiento del cultivo y sus componentes. El cultivo se estableció en el municipio de Lerma, Estado de México, durante los ciclos invierno-primavera (I-P) y verano-otoño (V-O) del periodo 2012-2013. Los cultivares evaluados fueron Siglo-TCL21 y Bicentenario, con dos dosis de N en I-P (0 y 150 kg ha-1), y tres dosis en V-O (0, 150 y 250 kg ha-1). El nitrógeno (N) fue fraccionado en tres momentos del desarrollo del cultivo: amacollamiento (AM), espiguilla terminal (ET) y hoja bandera (HB). La dosis de 150 fue fraccionada en: 1/3 AM, 1/3 ET y 1/3 HB, 1/2 AM y 1/2 ET y, todo en AM; la dosis de 250 fue fraccionada en: 2/5 AM, 2/5 ET y 1/5 HB y, 2/5 AM y 3/5 ET. El diseño experimental consistió en un arreglo de bloques completos al azar. El cultivar Bicentenario presentó mayor número de granos y Siglo-TCL21 mayor peso de grano. Con la dosis de N de 250 kg ha-1 se incrementaron los valores de rendimiento y biomasa en ambos cultivares. Los máximos rendimientos para los cultivares Bicentenario y Siglo-TCL21, se obtuvieron con la dosis de 250 kg ha-1 cuando ésta se fraccionó en 2/5 AM y 3/5 ET

    Fraccionamiento de nitrógeno: eficiencia de recuperación y concentración proteica en triticale (xTriticosecale Wittmack)

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    La eficiencia de recuperación de fertilizante nitrogenado es afectada por el momento de aplicación y la forma en que se distribuye el nitrógeno en los cultivos. El objetivo del presente estudio, fue determinar la eficiencia de recuperación de nitrógeno (ERN), aplicado al suelo en forma fraccionada en tres etapas fenológicas del cultivo, del triticale (x Triticosecale Wittmack). Se realizaron dos experimentos en campo (E1 y E2) en diferentes sitios del Estado de México, durante 2013. Los tratamientos consistieron en la aplicación fraccionada de dosis de 0, 150 y 250 kg ha -1 de nitrógeno, durante tres etapas fenológicas del cultivo: macollaje, espiguilla terminal y hoja bandera. El diseño experimental utilizado fue de bloques completos al azar con tres repeticiones. Se cuanti f icó el contenido de nitrógeno en grano, biomasa aérea, porcentaje de proteína y el nitrógeno recuperado por el cultivo. La ERN en grano en el E1 fue entre 29 y 34.5%, mientras que para el E2, se obtuvieron valores entre 13 y 36%. En el E1 no se observaron diferencias por el fraccionamiento de N aplicado en los tratamientos y entre cultivares; para E2, se observaron diferencias entre cultivares. El triticale presentó 0.5% de nitrógeno en su parte aérea para el E1, y 1.2% para el E2; en grano se alcanzó un valor de 1.8% para ambos experimentos. El fraccionamiento de la fertilización nitrogenada no afectó los parámetros de concentración de nitrógeno en los tejidos, ni la ERN, aún en las aplicaciones en la etapa de hoja bandera

    Manejo de fertilización nitrogenada sobre los componentes del rendimiento de triticale

    No full text
    La fertilización nitrogenada es uno de los factores de impacto más importantes en el crecimiento y desarrollo de los cultivos de cereales. Esta investigación tuvo como objetivo, determinar el efecto de la aplicación fraccionada de nitrógeno en diferentes estados fenológicos de dos cultivares de triticale (X Triticosecale Wittmack), y su relación con el rendimiento del cultivo y sus componentes. El cultivo se estableció en el municipio de Lerma, Estado de México, durante los ciclos invierno-primavera (I-P) y verano-otoño (V-O) del periodo 2012-2013. Los cultivares evaluados fueron Siglo-TCL21 y Bicentenario, con dos dosis de N en I-P (0 y 150 kg ha-1), y tres dosis en V-O (0, 150 y 250 kg ha-1). El nitrógeno (N) fue fraccionado en tres momentos del desarrollo del cultivo: amacollamiento (AM), espiguilla terminal (ET) y hoja bandera (HB). La dosis de 150 fue fraccionada en: 1/3 AM, 1/3ET y 1/3HB, 1/2 AM y 1/2ET y, todo en AM; la dosis de 250 fue fraccionada en: 2/5AM, 2/5ET y 1/5HB y, 2/5AM y 3/5ET. El diseño experimental consistió en un arreglo de bloques completos al azar. El cultivar Bicentenario presentó mayor número de granos y Siglo-TCL21 mayor peso de grano. Con la dosis de N de 250 kg ha-1 se incrementaron los valores de rendimiento y biomasa en ambos cultivares. Los máximos rendimientos para los cultivares Bicentenario y Siglo-TCL21, se obtuvieron con la dosis de 250 kg ha-1 cuando ésta se fraccionó en 2/5AM y 3/5 ET

    Risk factors associated with sexually transmitted infections and HIV among adolescents in a reference clinic in Madrid.

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    INTRODUCTION:Adolescents have a higher incidence of sexually transmitted infections (STIs) than persons of older age groups. The WHO emphasises the need to adopt specific and comprehensive prevention programmes aimed at this age group. The objective of this work was to analyse the prevalence of HIV/STIs among adolescents and to identify the sociodemographic, clinical and behavioural markers associated with these infections, in order to promote specific preventive strategies. METHODOLOGY:Retrospective descriptive study of adolescents, aged 10-19 years, who were attended to for the first consultation between 2016 and 2018 in a reference STI clinic in Madrid. All adolescents were given a structured epidemiological questionnaire where information on sociodemographic, clinical and behavioural characteristics was collected. They were screened for human inmmunodeficiency virus (HIV) and other sexually transmitted infections (STIs). The processing and analysis of the data was done using the STATA 15.0 statistical package. RESULTS:The frequency of HIV/STIs detected among all adolescents was: gonorrhoea 21.7%, chlamydia 17.1%, syphilis 4.8% and HIV 2.4%. After conducting a multivariate analysis, the independent and statistically significant variables related to the presence of an STI were having first sexual relations at a young age and having a history of STIs. Latin American origin was just below the level of statistical significance (p = 0.066). DISCUSSION/CONCLUSIONS:Adolescents who begin sexual relations at an early age or those who have a history of HIV/STIs are at higher risk of acquiring STIs. Comprehensive prevention programmes aimed specifically at adolescents should be implemented, especially before the age of 13 years

    Impact of 68Ga-PSMA PET/CT in the treatment of prostate cancer: initial experience in Spain

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    Aim To evaluate whether positron-emission tomography/computed tomography with 68Ga-PSMA (68Ga-PSMA PET/CT) influences the therapeutic management of patients with primary or recurrent prostate cancer (PCa). Background Although 68Ga-PSMA PET/CT is one of the best options for staging or restaging patients with PCa, its availability is still very limited in Spain. The present study reports the results of the first group of patients in Spain who underwent 68Ga-PSMA PET/CT imaging. Materials and methods All patients (n = 27) with a histological diagnosis of PCa who underwent 68Ga-PSMA PET/CT prior to the definitive treatment decision at the only centre with this technology in Spain during 2017–2018 were included. Two nuclear medicine physicians and a radiologist reviewed the imaging studies. The clinical impact was assessed from a theoretical perspective, based on the treatment that would have been applied if no data from the 68Ga-PSMA PET/CT were available. Results Most patients (n = 26; 96%) had persistent disease or biochemical recurrence after radical prostatectomy, radiotherapy, or combined treatment. One patient underwent 68Ga-PSMA PET/CT imaging to stage high-risk PCa. Overall, 68Ga-PSMA PET/CT was positive in 19 patients (70.4%). In 68.75% of these patients, none of the other imaging tests—MRI, CT, or bone scans—performed prior to the 68Ga-PSMA PET/CT were able to detect the presence of cancerous lesions. Overall, the findings of the 68Ga-PSMA PET/CT led to a modification of the therapeutic approach in 62.96% of the patients in the study. Conclusions 68Ga-PSMA PET/CT alters the therapeutic approach in a substantial proportion of patients with PCa.Sin financiaciónNo data JCR 20200.367 SJR (2020) Q3, 253/354 OncologyNo data IDR 2020UE

    Impact of Ga-PSMA PET/CT in the treatment of prostate cancer: Initial experience in Spain

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    AimTo evaluate whether positron-emission tomography/computed tomography with 68Ga-PSMA (68Ga-PSMA PET/CT) influences the therapeutic management of patients with primary or recurrent prostate cancer (PCa).BackgroundAlthough 68Ga-PSMA PET/CT is one of the best options for staging or restaging patients with PCa, its availability is still very limited in Spain. The present study reports the results of the first group of patients in Spain who underwent 68Ga-PSMA PET/CT imaging.Materials and methodsAll patients (n = 27) with a histological diagnosis of PCa who underwent 68Ga-PSMA PET/CT prior to the definitive treatment decision at the only centre with this technology in Spain during 2017–2018 were included. Two nuclear medicine physicians and a radiologist reviewed the imaging studies. The clinical impact was assessed from a theoretical perspective, based on the treatment that would have been applied if no data from the 68Ga-PSMA PET/CT were available.ResultsMost patients (n = 26; 96%) had persistent disease or biochemical recurrence after radical prostatectomy, radiotherapy, or combined treatment. One patient underwent 68Ga-PSMA PET/CT imaging to stage high-risk PCa. Overall, 68Ga-PSMA PET/CT was positive in 19 patients (70.4%). In 68.75% of these patients, none of the other imaging tests—MRI, CT, or bone scans—performed prior to the 68Ga-PSMA PET/CT were able to detect the presence of cancerous lesions. Overall, the findings of the 68Ga-PSMA PET/CT led to a modification of the therapeutic approach in 62.96% of the patients in the study.Conclusions68Ga-PSMA PET/CT alters the therapeutic approach in a substantial proportion of patients with PCa

    Tectonic and stratigraphic evolution of the Western Alboran Sea Basin in the last 25 Myrs

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    Teratogenicity and Embryotoxicity in Aquatic Organisms After Pesticide Exposure and the Role of Oxidative Stress

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