Many models of phosphorus (P) transfer at the catchment scale rely on input from generic databases including, amongst others, soil and land use maps. Spatially detailed geochemical data sets have the potential to improve the accuracy of the input parameters of catchment-scale nutrient transfer models. Furthermore, they enable the assessment of the utility of available, generic spatial data sets...

[1] Hydrologic losses can play a key role in regulating ecosystem nutrient balances, particularly in regions where baseline nutrient cycles are not augmented by industrial deposition. We used first-order streams to integrate hydrologic losses at the watershed scale across unpolluted old-growth forests in New Zealand. We employed a matrix approach to resolve how stream water concentrations of di...

Silicon (Si) is known as beneficial element for graminaceous plants. The importance of Si for plant functioning of cereals was recently emphasized. However, about the effect of Si availability on biomass production, grain yield, nutrient status and nutrient use efficiency for wheat (Triticum aestivum L.), as one of the most important crop plants worldwide, less is known so far. Consequently, we...

INTRODUCTION: Several novel cell culture mechanostimulus designs [1,2,3] have recently been introduced to obviate the strain field inhomogeneity and anisotropy seen with earlier designs [4,5] reliant on transmural pressure differentials applied across a diaphragmatic culture substrate. Despite the apparent improvement in substrate kinematic uniformity, these new designs introduce heretofore une...

Phytoplankton responses to nutrient enrichment are often assumed be universal, but in practice they can significantly vary because the effect size an increased supply of one may depend on availability other. Here, we used two complementary two-way factorial experiments determine how lake phytoplankton N and P with increasing concentrations other nutrient. We manipulated dissolved a 4-d bioassay...

The accumulation of phosphorus (P) and metals is a serious concern with the continuous application of manure to agricultural soils. Solid-liquid separation of swine slurry is a promising approach to reduce P and metal loadings through application of separated liquid (SL) as a nutrient source. However, little information is available on nutrient and metal loadings with the application of SL comp...

In this work we develop and analyze a mathematical model describing the dynamics of infection by a virus of a host population in a freshwater environment. Our model, which consists of a systemof nonlinear ordinary differential equations, includes an intrinsic quota, that is,weuse a nutrient (e.g., phosphorus) as a limiting element for thehost andpotentially for the virus. Motivation for such a ...

BACKGROUND Calcium is an essential element nutrient in our body, and insufficient calcium intake is very common in Korean. Socioeconomic status (SES) is known to be associated with quality of diet and health. The purpose of this study was to compare between calcium intake by region and SES. METHODS This study used data from a nationally represented sample of Koreans (n=19,249) from 2011 to 20...

Patients with liver failure have a high prevalence of malnutrition, which is related to metabolic abnormalities due to the liver disease, reduced nutrient intake and alterations in digestive function, among other factors. In general, in patients with liver failure, metabolic and nutritional support should aim to provide adequate nutrient intake and, at the same time, to contribute to patients' ...

Ecological researchers have long borrowed concepts from the theory of chemical kinetics to describe nutrient dynamics in ecosystems. Contemporary ecology, however, is in the process of creating its own suite of ideas to quantify how whole ecosystems develop. In particular, the theory of ecosystem ascendency can be applied to data on the simultaneous flows of various chemical constituents to det...