2,052 research outputs found
Cadmium accumulation and physiological response of sunflower plants to Cd during the vegetative growing cycle
No full textThe effects of soil Cd contamination on Cd accumulation and distribution, growth and physiological responses of sunflower plants were investigated. Plants were subject to six levels of soil contamination (from 2.5 to 15 mg Cd kg/soil) with an untreated control, from the emergence of the cotyledon leaves until the harvest, when plants were at the flower bud stage. An overall increase of Cd concentration was found in all tissues of the plants (roots, stem, young, mature and old leaves) by increasing the Cd contamination in the soil. Regardless of treatments, Cd concentration in roots always exceeded those in the aboveground dry matter with a low translocation from roots to shoots. At early stage of growth, Cd concentration in plants was higher than at the flower bud stage. Soil Cd contamination did not affect plant growth, relative water content and gas exchange parameters. Negative and significant correlation was only found between Cd concentration in the young leaves and chlorophyll concentration at the end of vegetative growing stage. Roots and old leaves are the main metal sinks suggesting a defense or tolerance mechanism of the plants to avoid toxic levels in physiologically most active apical tissues.
These results should be tested in open field to verify the suitability of sunflower in the area of phytotechnologies
Easter Morning: A.R. Ammons and His Poem Video Recording
No full textAudio recording of a poem entitled, "Easter Morning", recited by the poem's author, A.R. Ammons
Variation of glucosinolates concentration and root growth of horseradish as affected by nitrogen and sulphur supply
No full textThe aim of the study was to evaluate total and individual glucosinolates concentration, root weight and diameters of horseradish accessions (Cor and Mon) grown by adding nitrogen (N) and sulphur (S) and harvested at the beginning (late autumn) and towards the end (early spring) of the harvest period. The concentration of the 9 glucosinolates (GLS) quantified in roots varied greatly between accessions (6-fold higher in Cor) and with fertilization
(N alone led to an increase of 64% of GLS with an additional enhancement of 65% when S was added to N). Root GLS concentration was significantly higher in early spring compared to the previous harvest in late autumn (12.5 vs 8.9 μmol/g DW (dry weight)); a drastic decline of GLS (2.7 μmol/g DW) occurred in root harvested in the following autumn from plants left ad hoc in the field. The aliphatic sinigrin was the most abundant (80% of total GLS), followed by the aromatic gluconasturtiin and the indolic glucobrassicin (5.8% and 4.7%, respectively). Root diameter and weight increased in plants treated with fertilizers (19% and 61%, respectively) and throughout the harvests with Cor showing values double with respect to Mon (925 vs 476 g/plant). Relationships between GLS concentration and root weight (R2 = 0.61) and diameter (R2 = 0.69) were improved by excluding the roots harvested from plants left ad hoc in the field that showed the worst performances
A.R Baswedan dan PAl: Potret Nasionalisme Warga Keturunan perspektif sosiopolitik historis
No full textIn this article, the authors review about A.R. Baswedan
and his movement through the Arab Party of Indonesia (PAl).
A.R Baswedan is an Arab descendant known as the pioneer
of independence of the Republic of Indonesia. The author
through historical socio-political studies found that A.R
Baswedan is an example of Arabic descent who counter
Arabism and views between the Arab descendants and the
descendants of indigenous Indonesians are the same or
equal and the same fate. They both have one nationality,
Indonesia. This fusion attitude in the Indonesian citizenship
and nationality equation is evident in its movement within
the PAl.
Keywords: A.R. Baswedan, Biography, and Thought
(PAl
Lysimetric determination of muskmelon crop coefficients cultiveted under plastic mulches
No full textA trial was carried out at the lysimeter station in southern Italy on muskmelon crop cultivated with and without plastic mulch during spring–summer in 2001 and 2003. The objective of the experiment was to verify the reliability of the crop evapotranspiration (ETc) estimate by means of the most recent update of the FAO Irrigation and Drainage Paper 56, in comparison with ETc directly measured by two mechanical weighing lysimeters.
Crop coefficients (Kc) were determined during different development stages based on lysimetric measures of ETc and of the reference evapotranspiration (ET0) estimated through the Penman Monteith and the Hargreaves methods. On melon crop cultivated without plastic mulch, corrected crop coefficients (Kc) following the last FAO Irrigation and Drainage Paper 56 procedures were well correlated with those measured from lysimeter and were as reliable as the ETc estimate. In contrast, values of Kc proposed by FAO Irrigation and Drainage Paper 56 for crops grown with plastic mulch were meaningfully lowers than those measured from lysimeter, loading to an underestimation of water consumption. On muskmelon, cultivated with and without plastic mulch, it is necessary to adapt development phase duration, suggested by the FAO Irrigation and Drainage Paper 56, to the real phenology of the employed cultivar. An adaptation of the phenology to the real duration of the single phases is essential to avoid error in the estimate of ETc
A.R. Luria: Ideas and Prospects of Their Development in Pedagogical Psychology of the Twenty-first Century
No full textA.R. Luria’s ideas are well-known and recognized both in Russia and abroad. Scientists from different countries are actively working in neuropsychology, a part of the psychological science developed by A.R. Luria. The author has shown the relevance and importance of the neuropsychological approach to the pedagogical psychology problems and the availability to choose an adequate educational and nurturing strategy from these standpoints. The study seeks to rethink and assess the importance of A.R. Luria’s main ideas from the modern pedagogical psychology’s standpoints. The characteristic of the main theoretical provisions has been set forth based on the analysis of A.R. Luria’s academic papers and the main directions and prospects for the development of A.R. Luria’s ideas in the modern psychological pedagogical science have been determined. A.R. Luria’s academic papers most sought by the modern researchers have been noted. The study is based on the materials of the thesis researches on the pedagogical psychology problems conducted in the beginning of the twenty-first century, A.R. Luria’s papers, the publications of other researchers who have studied his contribution to the psychological science. The study results show that A.R. Luria has significantly contributed to the development of the pedagogical psychology problems. A.R. Luria’s ideas on the interaction of the humanitarian and science knowledge in the human comprehensive study, the cultural and historical understanding of the psychical functions development, and the language evolution in the music language study for the musical education development seem most promising for the pedagogical psychology development. Note has been taken of the importance of A.R. Luria’s ideas for the elaboration of the relevant problems of the training and development of a person at any age; the study of individual and typical features in mastering a foreign language; the study of the semantics of speech and means of coding meanings in the context of professional training of psychologists and teachers, specialists in the field of artistic creativity. The analysis of A.R. Luria’s main ideas facilitates the deeper understanding of the modern problems of the pedagogical psychology theory and practice
Incorporation of acceleration effects into the one-dimensional-turbulence model, with application to turbulent combustion and shock-turbulence interactions
No full textOne-dimensional turbulence (ODT) is a stochastic simulation in which 3D turbulence effects are captured on a notional 1D line of sight by introducing instantaneous spatial re-arrangements (maps) that represent advection by notional turbulent eddies. These eddy events incorporate the possibility of kinetic-energy changes that are equal and opposite to changes of other forms of energy such as the gravitational potential energy change due to a re-arrangement of a vertical density profile. This illustrates that motion aligned with an applied force, in this case gravitation , can be associated with energy change. Using this principle, we 1) present a model of turbulence interaction with the dilatational acceleration caused by thermal expansion in flames and show results for a turbulent counterflow flame with comparison to DNS and 2) present a model for shock-induced turbulence and show results for mixing width growth in a shock tube with comparison to experiments
ODTLES: A multi-scale ansatz for highly turbulent flows
No full textWe use ODTLES, a multi-dimensional extension of the One-Dimensional-Turbulence model (ODT). ODT describes turbulent advection on a 1D sub-domain using a stochastic process for turbulent advection. These 1D sub-domains are coupled to obtain a 3D approach. ODTLES is applied to channel flow. Preliminary results for the pdf of the wall shear stress are compared to DNS
Culturable bacteria from Zn- and Cd-accumulating Salix caprea with differential effects on plant growth and heavy metal availability.
No full textAims: To characterize bacteria associated with Zn ⁄ Cd-accumulating Salix
caprea regarding their potential to support heavy metal phytoextraction.
Methods and Results: Three different media allowed the isolation of 44 rhizosphere
strains and 44 endophytes, resistant to Zn ⁄Cd and mostly affiliated with
Proteobacteria, Actinobacteria and Bacteroidetes ⁄ Chlorobi. 1-Aminocyclopropane-
1-carboxylic acid deaminase (ACCD), indole acetic acid and siderophore
production were detected in 41, 23 and 50% of the rhizosphere isolates and in
9, 55 and 2% of the endophytes, respectively. Fifteen rhizosphere bacteria and
five endophytes were further tested for the production of metal-mobilizing
metabolites by extracting contaminated soil with filtrates from liquid cultures.
Four Actinobacteria mobilized Zn and ⁄ or Cd. The other strains immobilized
Cd or both metals. An ACCD- and siderophore-producing, Zn ⁄ Cd-immobilizing
rhizosphere isolate (Burkholderia sp.) and a Zn ⁄ Cd-mobilizing Actinobacterium
endophyte were inoculated onto S. caprea. The rhizosphere isolate
reduced metal uptake in roots, whereas the endophyte enhanced metal accumulation
in leaves. Plant growth was not promoted.
Conclusions: Metal mobilization experiments predicted bacterial effects on
S. caprea more reliably than standard tests for plant growth-promoting activities.
Significance and Impact of the Study: Bacteria, particularly Actinobacteria,
associated with heavy metal-accumulating Salix have the potential to increase
metal uptake, which can be predicted by mobilization experiments and may be
applicable in phytoremediation
Author Correction: Imaging-based representation and stratification of intra-tumor heterogeneity via tree-edit distance
No full textMartina Sollini and Paola Anna Erba were omitted from the author list in the original version of this Article. The Author Contributions section now reads: “L.C. conceived the pipeline, set up the case study, analysed the results, prepared the figures, and wrote the manuscript. M.P. formulated and tuned the pruned tree edit distance, provided the mathematical proofs and the simulation study, and wrote the manuscript. A.R. contributed to implement the patient representation pipeline. M.S. segmented the Prostate Cancer lesions and extracted the radiomic features for all patients in the case study. P.A.E collected the data and enrolled the patients in the clinical study. F.I. supervised the analyses and the conception of the pipeline. L.C., M.P., A.R. and F.I. reviewed and approved the manuscript.” The original Article and accompanying Supplementary Information file have been corrected.</p
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