274 research outputs found
Recharacterization of Gymnodamaeoidea and erection of Plateremaeoidea (Acari, Oribatei), with key to families and genera
Spin-phonon coupling in Gd(Co1/2Mn1/2)O3 perovskite
We have investigated the temperature-dependent Raman-active phonons and the
magnetic properties of Gd(Co1/2Mn1/2)O3 perovskite ceramics in the temperature
range from 40 K to 300 K. The samples crystallized in an orthorhombic distorted
simple perovskite, whose symmetry belongs to the Pnma space group. The data
reveals spin-phonon coupling near the ferromagnetic transition occurring at
around 120 K. The correlation of the Raman and magnetization data suggests that
the structural order influences the magnitude of the spin-phonon coupling.Comment: 3 Figures, suplementary materia
CsCuCl3 perovskite-like compound under extreme conditions
Halide perovskite has attracted intense research interest owing to its
multifaceted and versatile applications in optoelectronics. This intrigue is
further fueled by their propensity to undergo intricate structural
modifications under extreme conditions, thereby instigating property changes.
Within this context, our study delves deep into the intricate interplay of
structural and vibrational attributes within the inorganic-metal halide
perovskite-like CsCuCl3. Our approach employs Raman spectroscopy and
Synchrotron Powder X-Ray Diffraction (SPXRD) techniques harnessed under the
dual conditions of low temperatures and high pressures. We have observed a
distinct spin-phonon coupling mechanism by employing Raman spectroscopy at low
temperatures; this coupling has been manifested as a renormalization phonon
phenomenon that occurs notably at T* = 15 K. The correlation between spin and
phonon dynamics becomes pronounced through a notable hardening of phonon
temperature dependence, a behavior intricately linked to the material
antiferromagnetic transition at TN = 10.7 K. The SPXRD under high pressure
showed a first-order structural phase transition (SPT) at the critical pressure
Pc = 3.69 GPa, leading to the transformation from the hexagonal P6522 to a
base-centered monoclinic cell. Notably, the coexistence of both phases is
discernible within the pressure range from 2.79 to 3.57 GPa, indicating that
the SPT involves the reorganization of the internal [Cu2Cl9]5- dimer unit, with
the Cl-Cu-Cl bending contributing more than stretching modes. Furthermore, we
demonstrate that the SPT is reversible, but residual strain pressure influences
the modification of the critical pressure Pc value upon pressure decrease.Comment: 27 pages, 8 figure
Health care professionals' perceptions about atrial fibrillation care in the Brazilian public primary care system:a mixed-methods study
Dihaploid Coffea arabica genome sequencing and assembly.
Coffea arabica which accounts for 70% of world coffee production is an allotetraploid with a genome size of approximately 1.3 Gb and is derived from the hybridization of C. canephora (710 Mb) and C. eugenioides (670 Mb). To elucidate the evolutionary history of C. arabica, and generate critical information for breeding programs, a sequencing project is underway to finalize a reference genome using a dihaploid line and a set of Menu Abstract: Dihaploid Coffea arabica Genome Sequencing and Assembly (Plant and Animal Genome XXIII Conference) https://pag.confex.com/pag/xxiii/webprogram/Paper16983.html [25/02/2015 15:00:12] 30 C. arabica accessions
Avaliação de cultivares de soja, sob manejo orgânico, para fins de adubação verde e produção de grãos.
O objetivo deste trabalho foi avaliar o desempenho de seis cultivares de soja, sob manejo orgânico, para fins de adubação verde e produção de grãos. Utilizou-se delineamento experimental de blocos casualizados, com quatro repetições por tratamento (cultivar). Na época da colheita, 81 dias após a emergência das plântulas, todas as cultivares testadas (Celeste, Surubi, Campo Grande, Mandi, Lambari e Taquari) mostraram excelente nodulação, variando de 545 a 760 mg/planta de massa nodular seca. As cultivares Celeste e Taquari, que produziram, respectivamente, 8,33 e 7,12 t ha-1 de biomassa seca da parte aérea, apresentaram outras características agronômicas vantajosas, tais como: ciclo curto, alta acumulação de nutrientes (N, P, K, Ca e Mg) nos tecidos verdes e bom rendimento de sementes. Esses caracteres indicam potencial de 'Celeste' e 'Taquari' para adubação verde de verão em sistemas de agricultura orgânica. Cinco das cultivares avaliadas revelaram tendência ao acamamento, porém dentro de níveis aceitáveis. As cultivares Celeste, Surubi, Campo Grande, Mandi e Taquari suplantaram em 23%, 32%, 33%, 44% e 70%, respectivamente, a média nacional de produtividade de soja, estimada em 2.398 kg ha-1 nas últimas três safras
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