Search results for "Uptake"

Phytoextractors of metal(loid)s of the Italian flora: An Outline

Intensive farming, wastewater irrigation, mining, heavy industry, smelting procedures and improper waste disposal are some of the human activities that contribute to heavy metal soil contamination (Sharma et al. 2007; Khan et al. 2008; Yu et al. 2008). As heavy metals cannot be degraded by microorganisms and tend to remain in polluted sites for long periods of time, soil contamination by heavy metals represents a particular environmental concern and a serious threat to human health. Conventional soil remediation techniques, such as soil washing, excavation, in situ vitrification, solidification and stabilization, can be effectively employed in order to achieve remediation of heavy metal con…

Transepithelial transport of betalainic phytochemicals in Caco-2 cell monolayers.

2010

Iron and zinc bioavailability in Caco-2 cells: Influence of caseinophosphopeptides

2013

Abstract A study has been made of the influence of two pools of caseinophosphopeptides (CPPs) obtained from α s - and β-casein (CN) fractions, and of three specific CPPs (β-CN(1–25)4P, α s1 -CN(64–74)4P and α s2 -CN(1–19)4P), on iron bioavailability (ferritin synthesis) and zinc bioavailability (retention, transport and uptake of zinc) in Caco-2 cells. α-CPP and β-CPP pools did not improve ferritin synthesis, but the three specific CPPs showed an increase in ferritin synthesis in Caco-2 cells versus iron sulphate, β-CN(1–25)4P being the most effective. In relation to zinc bioavailability, α-CPPs, β-CPPs, α s1 -CN(64–74)4P and β-CN(1–25)4P increased zinc uptake. However, this increase was of…

Glucose uptake in germinating Aspergillus nidulans conidia: involvement of the creA and sorA genes

2003

d-Glucose uptake in germinating wild-typeAspergillus nidulansconidia is an energy-requiring process mediated by at least two transport systems of differing affinities for glucose: a low-affinity system (Km∼1·4 mM) and a high-affinity system (Km∼16 μM). The low-affinity system is inducible by glucose; the high-affinity system is subject to glucose repression effected by the carbon catabolite repressor CreA and is absent insorA3mutant conidia, which exhibit resistance tol-sorbose toxicity. An intermediate-affinity system (Km∼400 μM) is present insorA3conidia germinating in derepressing conditions.creAderepressed mutants show enhanced sensitivity tol-sorbose. The high-affinity uptake system ap…

CO2 fluxes of O. ficus-indica plants and single cladodes in relation to water stress

2013

The effect of arbuscular mycorrhizal fungi on total plant nitrogen uptake and nitrogen recovery from soil organic material

2013

SUMMARYArbuscular mycorrhizal (AM) fungi increase nitrogen (N) uptake by their host plants, but their role in plant N capture from soil organic material is still unclear. In particular, it is not clear if AM fungi compete with the host plant for the N coming from the decomposing organic matter (OM), especially when the AM extraradical mycelium (ERM) and plant roots share the same soil volume. The goal of the present research was to study the effects of AM fungi on wheat N capture after the addition of 15N-labelled OM to soil. Durum wheat (Triticum durum) was grown under controlled conditions in a sand:soil mix and the following treatments were applied: (1) AM inoculation with Glomus mosseae…

Is There an Advantage to Venlafaxine in Comparison with Other Antidepressants?

1997

The purpose of this article is to compare and contrast the benefits and limitations of antidepressant drugs. Several different classes of antidepressants are available for treatment of major depressive disorder, each with its own benefits and limitations as a result of its pharmacological profile. Tricyclic antidepressants (TCAs) and monoamine oxidase (MAO) inhibitors are effective in a large proportion of depressed patients, but their use is often limited by short- and long-term safety/tolerability problems. Selective serotonin reuptake inhibitors (SSRIs) exhibit comparable efficacy to TCAs in most patients, but may be less effective in certain patients. Additionally, SSRI use may by impac…

Thermal and Mechanical Characterization of Yarn Samples from Flemish Tapestry of the Sixteenth Century

2022

We propose a physico-chemical approach for theharacterization of the conservation condition of yarns from a Flemish tapestry of the sixteenth century. The aging effect on the yarns’ performance was evaluated by comparison with commercial materials. Water uptake experiments highlighted the aptitude of yarns toward water sorption and their increased hydrophilicity upon aging. Thermogravimetric analysis can be considered a fast approach for the fiber identification and assessment on the material life-time. The dynamic mechanical analysis provided direct evidence on the yarns, conservation state and their performance under different mechanical stresses. The proposed characterization path can be…

A New Method to Reconstruct Quantitative Food Webs and Nutrient Flows from Isotope Tracer Addition Experiments

2020

Understanding how nutrients flow through food webs is central in ecosystem ecology. Tracer addition experiments are powerful tools to reconstruct nutrient flows by adding an isotopically enriched element into an ecosystem and tracking its fate through time. Historically, the design and analysis of tracer studies have varied widely, ranging from descriptive studies to modeling approaches of varying complexity. Increasingly, isotope tracer data are being used to compare ecosystems and analyze experimental manipulations. Currently, a formal statistical framework for analyzing such experiments is lacking, making it impossible to calculate the estimation errors associated with the model fit, the…

Can cycling with an E-bike improve fitness? : effect of access to an Electric Assisted Bicycle on cycling distance and cardiopulmonary fitness in ina…

2016

Masteroppgave folkehelsevitenskap - Universitetet i Agder 2016 Background: The aims of the present study were to assess the effect of an eight-month intervention with access to an Electric assisted bicycle (E-bike) on (1) the amount of E-biking, (2) changes in cardiopulmonary fitness and (3) to assess whether cycled distance was associated with changes in cardiopulmonary fitness, among inactive adults. Methods: Twenty-five inactive Norwegian adults (33 – 57 years of age, 72 % women), were recruited through convenience sampling. Participants were given an E-bike for eight (N = 23) or three (N = 2) months. Socio-demographic characteristics were reported with a questionnaire. Bicycle use was m…