scholarly journals Colangiopancreatografía retrógrada endoscópica en una institución de referencia en cáncer.

2020 ◽  
Vol 35 (4) ◽  
pp. 430-435
Author(s):  
Raul Eduardo Pinilla Morales ◽  
JAIME MONTOYA ◽  
Ricardo Oliveros Wilches ◽  
Maria Eugenia Manrique Acevedo ◽  
Mario Rey Ferro ◽  
...  
Keyword(s):  
Residual N

Introducción: la endoscopia es una de las herramientas necesarias para el manejo de las enfermedades biliares y pancreáticas. La colangiopancreatografía retrógrada endoscópica (CPRE) es uno de los procedimientos técnicamente más demandantes y de mayor riesgo de complicaciones realizados en el tratamiento de los desórdenes hepatopancreatobiliares. Objetivo: caracterizar los resultados clínicos de los pacientes llevados a CPRE en un centro de pacientes con cáncer exclusivamente. Métodos: estudio de serie de casos observacional, retrospectivo, descriptivo con base en datos clínicos de pacientes llevados a CPRE en una población diagnosticada con cáncer de distintos orígenes primarios y en diferentes estadios de enfermedad desde enero de 2010 hasta enero de 2017. Resultados: se analizaron 255 procedimientos en los que predominó el sexo femenino con 140 casos (54,9 %), el promedio de edad fue 62,9 años (desviación estándar [DE]: 12,9 años). Todos los procedimientos se hicieron con intención terapéutica. La indicación más frecuente fue cáncer de páncreas (n = 47; 18,43 %), compresión extrínseca de la vía biliar (n = 42; 16,47 %), disfunción de prótesis (n = 36; 14,12%), colecistocoledocolitiasis (n = 32; 12,55 %), otras causas (n = 32; 12,55 %), cáncer de vesícula (n = 24; 9,41 %), colangiocarcinoma extrahepático (n = 21; 8,24 %), coledocolitiasis recidivante (n = 9; 3,53%), coledocolitiasis residual (n = 6; 2,35 %) y tumor de Klatskin (n = 6; 2,35 %). La canalización exitosa se presentó en 222 casos (87,06 %). Durante el procedimiento, 10 pacientes presentaron complicaciones (4,3 %), de las cuales la pancreatitis y las perforaciones fueron las más frecuentes (n = 3; 1,18 %), seguidas por sangrado, colangitis (n = 2; 0,78 %) y dolor post-CPRE 1 (0,39 %). Conclusiones: en la población evaluada, la causa predominante para realizar el procedimiento está relacionada con cáncer y la frecuencia tanto de canalización exitosa como de complicaciones es similar a la de los reportes en las poblaciones generales. 

scholarly journals Single and split nitrogen dose in wheat yield indicators

2018 ◽  
Vol 22 (1) ◽  
pp. 16-21 ◽  
Author(s):  
Juliane S. P. Costa ◽  
Rubia D. Mantai ◽  
José A. G. da Silva ◽  
Osmar B. Scremin ◽  
Emilio G. Arenhardt ◽  
...  
Keyword(s):  
Block Design ◽  
Wheat Yield ◽  
N Use Efficiency ◽  
Phenological Stages ◽  
Split Dose ◽  
N Supply ◽  
N Release ◽  
Residual N ◽  
Use Efficiency ◽  
N Use

ABSTRACT Single or split nitrogen (N) supply can maximize the expression of wheat yield indicators. The objective of the study was to evaluate the greater N use efficiency on wheat yield indicators by the single and split N supply under favorable and unfavorable year conditions to the crop in succession system of high and reduced residual N release. The study was conducted in 2014 and 2015, in a randomized complete block design with four replicates in a 4 x 3 factorial, for N-fertilizer doses (0, 30, 60, 120 kg ha-1) and supply forms [full dose (100%) in the phenological stage V3 (third expanded leaf); split dose (70 and 30%) in the phenological stages V3/V6 (third and sixth expanded leaves, respectively) and; split dose (70 and 30%) in the phenological stages V3/R1 (third expanded leaf and early grain filling)], respectively, in soybean/wheat and maize/wheat cultivation systems. The highest N use efficiency for wheat yield was obtained with the single dose supply in favorable year of temperature and rainfall and with the split dose in the V3/V6 stages in unfavorable year, regardless of the succession system of high and reduced residual N release.

scholarly journals Heterogeneity in Decomposition Rates and Nutrient Release in Fine-Root Architecture of Pinus massoniana in the Three Gorges Reservoir Area

Forests ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 14
Author(s):  
Shao Yang ◽  
Ruimei Cheng ◽  
Wenfa Xiao ◽  
Yafei Shen ◽  
Lijun Wang ◽  
...  
Keyword(s):  
Lower Order ◽  
Fine Root ◽  
C:N Ratio ◽  
Pinus Massoniana ◽  
Higher Order ◽  
Root Decomposition ◽  
Decomposition Rates ◽  
N Release ◽  
Residual N ◽  
Fine Root Decomposition

Fine-root decomposition contributes a substantial amount of nitrogen that sustains both plant productivity and soil metabolism, given the high turnover rates and short root life spans of fine roots. Fine-root decomposition and soil carbon and nitrogen cycling were investigated in a 1-year field litterbag study on lower-order roots (1–2 and 3–4) of Pinus massoniana to understand the mechanisms of heterogeneity in decomposition rates and further provide a scientific basis for short-time research on fine-root decomposition and nutrient cycling. Lower-order roots had slower decay rates compared with higher-order roots (5–6). A significantly negative correlation was observed between the decay constant mass remaining and initial N concentrations as well as acid unhydrolyzable residues. Results also showed that in lower-order roots (orders 1–2 and 3–4) with a lower C:N ratio, root residual N was released and then immobilized, whereas in higher-order roots (order 5–6) with a higher C:N ratio, root residual N was immobilized and then released in the initial stage. In the later stage, N immobilization occurred in lower-order roots and N release in higher-order roots, with the C:N ratio gradually decreasing to about 40 in three branching-order classes and then increasing. Our results suggest that lower-order roots decompose more slowly than higher-order roots, which may result from the combined effects of high initial N concentration and poor C quality in lower-order roots. During the decomposition of P. massoniana, N release or N immobilization occurred at the critical C:N ratio.

Response of safflower (Carthamus tinctorius L.) to residual soil N following cotton (Gossypium spp.) in rotation in the San Joaquin Valley of California

2002 ◽  
Vol 138 (4) ◽  
pp. 395-402 ◽  
Author(s):  
E. S. BASSIL ◽  
S. R. KAFFKA ◽  
R. A. HUTMACHER
Keyword(s):  
Soil Profile ◽  
N Uptake ◽  
Carthamus Tinctorius ◽  
San Joaquin Valley ◽  
Safflower Seed ◽  
Residual Soil ◽  
Soil N ◽  
Oil Composition ◽  
N Level ◽  
Residual N

Deep-rooted crops used in rotation can improve the overall water and N use efficiencies of cropping systems and help minimize nitrate leaching to groundwater. Safflower (Carthamus tinctorius L.) is a deep-rooted annual crop grown in Mediterranean regions that might be useful for this purpose. Safflower's response to residual soil N measured to 2.7 m in the soil profile was evaluated in 1998 in field plots in the San Joaquin Valley, California, USA that were used previously for cotton over a 9-year period and had been fertilized with nine N rates from 0 to 230 kg N/ha. Residual soil NO3-N measured prior to safflower planting increased with prior cotton fertilization rates. Amounts present to a soil profile depth of 2.7 m varied from 760 to 2600 kg/ha. Safflower seed yield increased with increasing pre-plant residual NO3-N levels, from 1700 kg/ha in the control to 2200 kg/ha, and then declined to 1800 kg/ha at the largest residual N level. Oil per cent, and oil yield were affected by soil N only at the largest residual N level, while oil composition was not affected. Root growth and N uptake at depth increased in plots with larger amounts of residual N compared to those with less. Results suggest that N fertilization applied to safflower could be reduced or even eliminated following crops previously fertilized at economic levels. Residual N should be accounted in growers' management programmes.

scholarly journals Nitrogen Risk Assessment Model for Scotland: I. Nitrogen leaching

2004 ◽  
Vol 8 (2) ◽  
pp. 191-204 ◽  
Author(s):  
S. M. Dunn ◽  
A. J. A. Vinten ◽  
A. Lilly ◽  
J. DeGroote ◽  
M. A. Sutton ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Land Use ◽  
Policy Development ◽  
Agricultural Land ◽  
Growing Season ◽  
Assessment Model ◽  
N Leaching ◽  
Risk Assessment Model ◽  
Catchment Scale ◽  
Residual N

Abstract. The Nitrogen Risk Assessment Model for Scotland (NIRAMS) has been developed for prediction of streamwater N concentrations draining from agricultural land in Scotland. The objective of the model is to predict N concentrations for ungauged catchments, to fill gaps in monitoring data and to provide guidance in relation to policy development. The model uses nationally available data sets of land use, soils, topography and meteorology and has been developed within a Geographic Information System (GIS). The model includes modules to calculate N inputs to the land, residual N remaining at the end of the growing season, weekly time-series of leached N and transport of N at the catchment scale. This paper presents the methodology for calculating N balances for different land uses and for predicting the time sequence of N leaching after the end of the growing season. Maps are presented of calculated residual N and N leaching for the whole of Scotland and the spatial variability in N leaching is discussed. The results demonstrate the high variability in N leaching across Scotland. The simulations suggest that, in the areas with greatest residual N, the losses of N are not directly proportional to the amount of residual N, because of their coincidence with lower rainfall. In the companion paper, the hydrological controls on N transport within NIRAMS are described, and results of the full model testing are presented. Keywords: nitrogen, diffuse pollution, agriculture, leaching, land use, model, national, catchment

Residual n-p interaction in heavy nuclei and high isomeric states

1964 ◽  
Vol 60 (2) ◽  
pp. 177-191 ◽  
Author(s):  
L.A. Sliv ◽  
Yu.I. Kharitonov
Keyword(s):  
Heavy Nuclei ◽  
Residual N ◽  
Isomeric States

Lupin as a biological plough: evidence for, and effects on wheat growth and yield

1989 ◽  
Vol 29 (1) ◽  
pp. 99 ◽  
Author(s):  
CWL Henderson
Keyword(s):  
Nitrogen Fixation ◽  
Soil Water ◽  
Plant Density ◽  
Crop Rotations ◽  
Growth And Yield ◽  
Wheat Crop ◽  
Sand Soil ◽  
Wheat Growth ◽  
Residual N ◽  
Plant Densities

The effects of the density of lupin (Lupinus angustifolius L. cv. Illyarrie) taproots on a following wheat crop (Tritium aestivum L. cv. Gutha) were investigated on a compacted, earthy sand soil near Geraldton, Western Australia. In 1985, plots were sown to lupins at densities ranging from 35 to 220 plants m-2. Because peak lupin biomass varied by less than 25%, and 100 kg N ha-1 of mineral fertiliser was supplied to the wheat, the effects of variation in residual N from the lupins were considered to be minimal. In 1986, all plots were split for shallow or deep tillage and wheat sown. There were no effects of tillage or lupin density on stored soil water at sowing. Growth and yield of wheat on the shallow tilled plots increased linearly with lupin plant density in the previous year, to equal or better wheat yields on the deep tilled plots, which were unaffected by lupin density. At normal farm lupin plant densities, the biological plough effect was estimated to improve wheat yields by 100 kg ha-1, substantially less than the benefits from nitrogen fixation and breaks in disease cycles. Nevertheless, it still suggests that lupin stand densities should be maintained or increased in crop rotations on compacted sands.

scholarly journals Nitrogen Fate and Efficiency of Fertilizer Application under a Rapeseed–Wheat–Rice Rotation System in Southwest China

Agronomy ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 258
Author(s):  
Peng Ma ◽  
Yan Lan ◽  
Tengfei Lyu ◽  
Feijie Li ◽  
Zhiyuan Yang ◽  
...  
Keyword(s):  
Southern China ◽  
Fertilizer Application ◽  
Application Rate ◽  
N Fertilizer ◽  
Management Model ◽  
Fertilizer Management ◽  
Rotation System ◽  
Residual N ◽  
Rice Season ◽  
Stable Yield

To evaluate the efficient use of nitrogen (N) for rice in a rapeseed–wheat–rice rotation system, a pot experiment was conducted. The results indicated that in the conventional 15N-labeled (Nc) and reduced 15N-labeled (Nr) urea applications, absorbed N and soil residual N was higher in rapeseed than in wheat. In the rice season, the higher accumulation of 15N was achieved with an Nr application rate during the rapeseed season and an N fertilizer management model (40% as basal fertilizer, 40% as tillering fertilizer, and 20% as panicle fertilizer) during the rice season (PrNrM3). A high 15N accumulation was also achieved under the Nc application rate during the wheat season and the N fertilizer management model during the rice season (PwNcM3). The accumulation of 15N in PrNrM3 and PwNcM3 accounted for 21.35% and 36.72% of the residual N under the Nr application rate in the rapeseed season and the Nc application rate in the wheat season, respectively. Compared with the Nc application rate in the rapeseed season and M3 N management in the rice season (PrNcM3), the N agronomy efficiency (NAE) and the N partial factor efficiency (NPFP) of rice were increased by 23.85% and 1.59%, respectively, in PrNrM3. The annual crop yield was 3.95% lower in PrNrM3, which was not significant. PrNrM3 was a stable yield, N-saving application rate for rapeseed-rice rotation systems in southern China.

Effect of soybean population density on soybean yield, nitrogen accumulation and residual nitrogen

1988 ◽  
Vol 28 (1) ◽  
pp. 99 ◽  
Author(s):  
MJ Blumenthal ◽  
VP Quach ◽  
PGE Searle
Keyword(s):  
Population Density ◽  
Grain Yield ◽  
Dry Matter ◽  
Nitrogen Accumulation ◽  
Soil N ◽  
Population Densities ◽  
N Accumulation ◽  
Soybean Yield ◽  
Residual Nitrogen ◽  
Residual N

The effect of soybean population density on soybean yield, nitrogen accumulation and residual nitrogen was examined at Camden, N.S.W. (34�S.). In the first experiment, treatments were soybeans (cv. Ransom) at 50, 100, 200 and 400 x 103 plants ha-1; maize (cv. XL66); and a weed-free fallow. Total dry matter yields of tops and grain yields were highest at 200x 103 plants ha-1 (6214 and 3720 kg ha-1, respectively). The yield component most affected by population density was number of branches per plant, with values decreasing with increasing population density. The proportion of unfilled pods was highest at the highest population density. Total nitrogen (N) accumulation in the tops and in the grain was also at a maximum at 200x 103 plants ha-1. The rate of dry matter accumulation declined during pod filling at all population densities. N accumulation continued at high rates throughout the growing season except in the 400x 103 plants ha-1 population. There was a trend for residual dry matter and N in residues to increase with increasing population density. After grain and forage harvest of the first experiment, a crop of wheat (cv. Kite) was sown over the whole area to determine residual N available at anthesis and at maturity (experiment 2). The values of N accumulation in the wheat at maturity were 24 kg N ha-l for the maize treatment, 40-60 kg N ha-l for the soybean treatments and 69 kg N ha-1 for the fallow treatment. Grain yield and grain N followed the pattern of dry matter production and N accumulation at final harvest. The data suggest that soybean depletes soil N to a lesser extent than does maize. For the soybean treatments, there was a trend of increasing residual N at the 3 highest population densities (40-60 kg N ha-1). This was probably a result of an increase in N in leaf fall and in decaying tops and roots at the highest population density. The high value (57 kg N ha-l) at the lowest population density may be due to soybean plants at this density not using as much soil N as the other soybean treatments. No benefit in residual N was gained from planting soybeans at a density beyond the optimum for grain yield when residues were removed by forage harvesting.

SEC-MALS study on aggregates of chitosan molecules in aqueous solvents: Influence of residual N-acetyl groups

2006 ◽  
Vol 66 (2) ◽  
pp. 192-198 ◽  
Author(s):  
M. Yanagisawa ◽  
Y. Kato ◽  
Y. Yoshida ◽  
A. Isogai
Keyword(s):  
Residual N
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