535 research outputs found
Yield and morphology of Nopalea cochenillifera under N fertilization and biological inoculation
Received: August 15th, 2023 ; Accepted: October 30th, 2023 ; Published: November 9th, 2023 ;
Correspondence: [email protected]; [email protected] objective was to evaluate the effect of inoculation with Azospirillum brasilense
and levels of nitrogen fertilization on the productive aspects of the spineless cactus (Nopalea
cochenillifera). The experiment was carried in Ribeirão do Largo, Southwest region of the state
of Bahia, from April 2019 to April 2020. The experiment was carried out in a 2×4 factorial, in a
randomized block design with eight treatments and four replications. The treatments consisted of
the absence or inoculation with Azospirillum brasilense and nitrogen fertilization levels 0, 50,
100 and 150 kg–
¹ of N ha–¹
. There was a positive effect for the use of the bacteria on cladode area
index, height, number of secondary, tertiary and total cladodes, total weight for cladodes of all
orders and also for final weight per ha–¹
. There was a significant effect of the use of the inoculant
for the levels of total soluble sugars and starch, where there was a decrease in the values for the
treatments submitted to the use of the bacteria. There was a quadratic effect for the weight of the
tertiary cladodes, number of tertiary cladodes and total of spineless cactus when submitted to
nitrogen fertilization levels. There was a linear test for cladodes area index when nitrogen
fertilization was used. The use of Azospirillum brasilense is positive for the cultivation of
spineless cactus, improving development and increasing crop productivity
Carbohydrate and protein metabolism of marandu grass affected by nitrogen fertilisation and number of cuts
Received: June 18th, 2023 ; Accepted: September 30th, 2023 ; Published: October 23rd, 2023 ; Correspondence: [email protected] the metabolism of tropical grasses in response to management practises
imposed in pastoral environments allows for improvements in the management and use of mineral
fertilisers. This study aimed to quantify metabolite content in different plant parts of Marandu
grass (Urochloa brizantha), with a specific focus on the influence of nitrogen fertilisation and its
effects following successive cuts. The treatments corresponded to four nitrogen (N) rates
(0, 75, 150, and 225 kg N ha-1
) and the number of cuts (one, two and three cuts). The plants were
fractionated into leaves, stems, and roots to assess the content of water-soluble carbohydrates
(WSC), starch, albumin, globulin, prolamin, and glutelin content. N fertilisation influenced the
WSC and starch content in different parts of the plant, varying according to the cuts made. In the
leaves and roots, fertilisation reduced the content of WSC and starch with one cut, as these were
utilised as energy sources for assimilating the excess nitrogen in the soil. There was an increase
in the concentration of all protein groups with nitrogen fertilisation in all parts of the plant with
one cut. In plants cut two and three times, N fertilisation led to specific increases and decreases
in different parts of the plants as an adaptive strategy for allocating resources as the number of
cuts increased. Our results broaden our understanding of carbohydrate and protein metabolism in
tropical grasses, thereby providing subsidies for the rational use of nitrogen fertilisers
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Acoustically Driven Stark Effect in Transition Metal Dichalcogenide Monolayers
The Stark effect is one of the most efficient mechanisms to manipulate many-body states in nanostructured systems. In mono- and few-layer transition metal dichalcogenides, it has been successfully induced by optical and electric field means. Here, we tune the optical emission energies and dissociate excitonic states in MoSe2 monolayers employing the 220 MHz in-plane piezoelectric field carried by surface acoustic waves. We transfer the monolayers to high dielectric constant piezoelectric substrates, where the neutral exciton binding energy is reduced, allowing us to efficiently quench (above 90%) and red-shift the excitonic optical emissions. A model for the acoustically induced Stark effect yields neutral exciton and trion in-plane polarizabilities of 530 and 630 × 10-5 meV/(kV/cm)2, respectively, which are considerably larger than those reported for monolayers encapsulated in hexagonal boron nitride. Large in-plane polarizabilities are an attractive ingredient to manipulate and modulate multiexciton interactions in two-dimensional semiconductor nanostructures for optoelectronic applications. © 2021 The Authors. Published by American Chemical Society
Multi-triangulations as complexes of star polygons
Maximal -crossing-free graphs on a planar point set in convex
position, that is, -triangulations, have received attention in recent
literature, with motivation coming from several interpretations of them.
We introduce a new way of looking at -triangulations, namely as complexes
of star polygons. With this tool we give new, direct, proofs of the fundamental
properties of -triangulations, as well as some new results. This
interpretation also opens-up new avenues of research, that we briefly explore
in the last section.Comment: 40 pages, 24 figures; added references, update Section
Exact time-localized solutions in Vacuum String Field Theory
We address the problem of finding star algebra projectors that exhibit
localized time profiles. We use the double Wick rotation method, starting from
an Euclidean (unconventional) lump solution, which is characterized by the
Neumann matrix being the conventional one for the continuous spectrum, while
the inverse of the conventional one for the discrete spectrum. This is still a
solution of the projector equation and we show that, after inverse
Wick-rotation, its time profile has the desired localized time dependence. We
study it in detail in the low energy regime (field theory limit) and in the
extreme high energy regime (tensionless limit) and show its similarities with
the rolling tachyon solution.Comment: 27 pages, 2 figures. v2: typos corrected, ref added, comment added in
last section, to appear on NP
Waist circumference as a mediator of biological maturation effect on the motor coordination in children
AbstractObjectiveThe present study aimed to: 1) examine the association of biological maturation effect on performance at a motor coordination battery and 2) to assess whether the association between biological maturation and scores obtained in motor coordination tests is mediated by some anthropometric measurement.MethodsThe convenience sample consisted of 73 male children aged 8 years old. Anthropometric data considered the height, body mass, sitting height, waist circumference, body mass index, fat mass and fat-free mass estimates. Biological maturation was assessed by the percentage of the predicted mature stature. Motor coordination was tested by the Körperkoordinationstest für Kinder. A partial correlation between anthropometric measurements, z-score of maturation and the motor coordination tests were performed, controlling for chronological age. Finally, causal mediation analysis was performed.ResultsHeight, body mass, waist circumference and fat mass showed a slight to moderate inverse correlation with motor coordination. Biological maturation was significantly associated with the balance test with backward walking (r=−0.34). Total mediation of the waist circumference was identified in the association between biological maturation and balance test with backward walking (77%).ConclusionsWe identified an association between biological maturation and KTK test performance in male children and also verified that there is mediation of waist circumference. It is recommended that studies be carried out with female individuals and at other age ranges
Bubbling AdS and Vacuum String Field Theory
We show that a family of 1/2--BPS states of SYM is in correspondence
with a family of classical solutions of VSFT with a --field playing the role
of the inverse Planck constant. We show this correspondence by relating the
Wigner distributions of the fermion systems representing such states, to
low energy space profiles of systems of VSFT D-branes. In this context the
Pauli exclusion principle appears as a consequence of the VSFT projector
equation. The family of 1/2--BPS states maps through coarse--graining to
droplet LLM supergravity solutions. We discuss the possible meaning of the
corresponding coarse graining in the VSFT side.Comment: 23 pages, subsection 4.1 added, Appendix suppressed. to be published
in NP
Pharmacogenetic polymorphisms in Brazilian-born, first-generation Japanese descendants
Brazil hosts the largest Japanese community outside Japan, estimated at 1.5 million individuals, one third of whom are first-generation, Brazilian-born with native Japanese parents. This large community provides a unique opportunity for comparative studies of the distribution of pharmacogenetic polymorphisms in native Japanese versus their Brazilian-born descendants. Functional polymorphisms in genes that modulate drug disposition (CYP2C9, CYP2C19 and GSTM3) or response (VKORC1) and that differ significantly in frequency in native Japanese versus Brazilians with no Japanese ancestry were selected for the present study. Healthy subjects (200 native Japanese and 126 first-generation Japanese descendants) living in agricultural colonies were enrolled. Individual DNA was genotyped using RFLP (GSTM3*A/B) or TaqMan Detection System assays (CYP2C9*2 and *3; CYP2C19*2 and *3; VKORC1 3673G>A, 5808T>G, 6853G>C, and 9041G>A). No difference was detected in the frequency of these pharmacogenetic polymorphisms between native Japanese and first-generation Japanese descendants. In contrast, significant differences in the frequency of each polymorphism were observed between native or first-generation Japanese and Brazilians with no Japanese ancestry. The VKORC1 3673G>A, 6853G>C and 9041G>A single nucleotide polymorphisms were in linkage disequilibrium in both native and first-generation Japanese living in Brazil. The striking similarity in the frequency of clinically relevant pharmacogenetic polymorphisms between Brazilian-born Japanese descendants and native Japanese suggests that the former may be recruited for clinical trials designed to generate bridging data for the Japanese population in the context of the International Conference on Harmonization
Avaliação fitossociológica da comunidade infestante em áreas de transição para o café orgânico.
Objetivou-se com este trabalho verificar os efeitos dos insumos orgânicos e convencionais na dinâmica de plantas daninhas da lavoura durante o primeiro e o segundo ano de transição agroecológica. Para isso, montou-se um experimento em um cafezal de seis anos, onde iniciou-se a transição para o sistema de cultivo orgânico. A espécie mais importante no primeiro ano da transição, na maioria das áreas avaliadas, foi Ageratum conyzoides; no segundo ano ocorreu considerável mudança na relação de dominância entre as espécies, destacando-se Leunurus sibiricus na maior parte das áreas estudadas. Ocorreu também aumento do número de espécies presentes na maioria das áreas de um ano para o outro. No segundo ano de transição observou-se decréscimo na diversidade de espécies em relação ao primeiro ano. Dessa forma, pode-se concluir que nos dois anos de avaliação verificaram-se mudanças no número, na diversidade e na relação de importância entre as espécies de um ano para o outro
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