2,120 research outputs found
Estudio Electromiográfico del Músculo Masetero tras Cirugía de Tercer Molar Inferior
Alves, N (Alves, Nilton)Univ Talca, Fac Ciencias Salud, Unidad Anat Normal, Talca, ChileThird molar extraction surgery is one of the most frequently performed procedures in the areas of buccal-maxillofacial traumatology and surgery. The post-surgery evolution was evaluated based on the clinical evidence obtained so far. The objective of this study was to analyze the post-surgery clinical evolution of the masseter muscle by means of surface electromyography, to evaluate muscle activity. Four analyses were performed: one pre-surgery, to register the normal activity, and three in post-surgery: on the 7(th), 14(th) and 21(st) postoperative days, in a sample of 30 patients. On the 21(st) day, there was near normal recovery of the electrical signal of the masseter in women, but in men this activity did not reach normal levels. Surface electromyography is a safe and reliable tool for post-surgery evolution control of masseter function
Binding affinities and activation of Asp712Ala and Cys100Ser mutated kinin B1 receptor forms suggest a bimodal scheme for the molecule of bound-DABK
AbstractMutant forms of kinin B1 receptor (B1R) and analogs of the full agonist des-Arg9-bradykinin (DABK) were investigated aiming to verify the importance of selected receptor residues and of each agonist-peptide residue in the specific binding and activation. Linked by a specific disulfide bond (Cys100–Cys650), the N-terminal (Nt) and the EC3 loop C-terminal (Ct) segments of angiotensin II (AngII) receptor 1 (AT1R) have been identified to form an extracellular site for binding the agonist Nt segment (Asp1 and Arg2 residues). Asp712 residue at the receptor EC3 loop binds the peptide Arg2 residue. By homology, a similar site might be considered for DABK binding to B1R since this receptor contains the same structural elements for composing the site in AT1R, namely the disulfide bond and the EC3 loop Asp712 residue. DABK, Alan-DABK analogs (n=Ala1-, Ala2-, Ala3-, Ala4-, Ala5-, Ala6-, Ala7-, Ala8-DABK), and other analogs were selected to binding wild-type, Asp712Ala and Cys100Ser mutated B1R receptors. The results obtained suggested that the same bimodal scheme adopted for AngII-AT1R system may be applied to DABK binding to B1R. The most crucial similarity in the two cases is that the Nt segments of peptides equally bind to the homologous Asp712 residue of both AT1R and B1R extracellular sites. Confirming this preliminary supposition, mutation of residues located at the B1R extracellular site as EC3 loop Asp712 and Cys100 caused the same modifications in biological assays observed in AT1R submitted to homologous mutations, such as significant weakening of agonist binding and reduction of post-receptor-activation processes. These findings provided enough support for defining a site that determines the specific binding of DABK to B1R receptors
The Bose-Hubbard model is QMA-complete
The Bose-Hubbard model is a system of interacting bosons that live on the
vertices of a graph. The particles can move between adjacent vertices and
experience a repulsive on-site interaction. The Hamiltonian is determined by a
choice of graph that specifies the geometry in which the particles move and
interact. We prove that approximating the ground energy of the Bose-Hubbard
model on a graph at fixed particle number is QMA-complete. In our QMA-hardness
proof, we encode the history of an n-qubit computation in the subspace with at
most one particle per site (i.e., hard-core bosons). This feature, along with
the well-known mapping between hard-core bosons and spin systems, lets us prove
a related result for a class of 2-local Hamiltonians defined by graphs that
generalizes the XY model. By avoiding the use of perturbation theory in our
analysis, we circumvent the need to multiply terms in the Hamiltonian by large
coefficients
Entanglement and Quantum Phase Transitions via Adiabatic Quantum Computation
For a finite XY chain and a finite two-dimensional Ising lattice, it is shown
that the paramagnetic ground state is adiabatically transformed to the GHZ
state in the ferromagnetic phase by slowly turning on the magnetic field. The
fidelity between the GHZ state and an adiabatically evolved state shows a
feature of the quantum phase transition.Comment: Revise
Effects of positive airway pressure therapy on cardiovascular and metabolic markers in males with obstructive sleep apnea
Introduction: Obstructive sleep apnea syndrome (OSAS) is associated with cardiovascular/
metabolic complications. Some analytical parameters (homocysteine, glycemic and lipidic
profiles) are recognized markers of these consequences. Limited data is available on the association
of these markers and OSAS’s severity/response to positive airway pressure therapy
(PAP).
Material and methods: In this prospective study we analyzed polysomnographic and analytical
data of male patients admitted to sleep laboratory. The aim was to evaluate
metabolic/cardiovascular markers in snorers and OSAS patients, to relate with sleep parameters
and PAP response. One-hundred and three patients were included, and 73 (71%) were
OSAS patients. OSAS patients were similar to snorers except for higher body mass index
(BMI) and dyslipidemia. Severe OSAS patients showed higher glycemia, HbA1c, insulin, and
insulin resistance, and lower HDL cholesterol in comparison to mild---moderate (p < 0.05,
p < 0.05, p < 0.001, p < 0.001, p < 0.05, respectively). Glycemic profile and triglycerides were
slightly correlated with OSAS severity. 46 OSAS patients were submitted to 6 months of PAP, with a statistical decrease in mean values of homocysteine, glycemia, total and LDL cholesterol(p < 0.05, p < 0.05, p < 0.05, respectively), and in glycemia and LDL cholesterol in severe grouponly (p < 0.05, p < 0.05, respectively).Results: This study demonstrated an association between glucose metabolism parameters andtriglycerides with OSAS severity underlying the complexity of the process leading to cardiovas-cular/metabolic complications in this disorder. Moreover, homocysteine, glycemic and lipidicprofiles changed significantly after 6 months of PAP therapy in OSAS, supporting its cardiovas-cular and metabolic protective effect.Conclusion: Our study has reinforced the importance of analytical cardiovascular/metabolicevaluation as complementary tool of diagnosis/treatment response in OSAS.info:eu-repo/semantics/publishedVersio
NEW SEISMIC SOURCE ZONE MODEL FOR PORTUGAL AND AZORES
The development of seismogenic source models is one of the first steps in seismic hazard assessment. In seismic hazard terminology, seismic source zones (SSZ) are polygons (or volumes) that delineate areas with homogeneous characteristics of seismicity. The importance of using knowledge on geology, seismicity and tectonics in the definition of source zones has been recognized for a long time [1]. However, the definition of SSZ tends to be subjective and controversial. Using SSZ based on broad geology, by spreading the seismicity clusters throughout the areal extent of a zone, provides a way to account for possible long-term non-stationary seismicity behavior [2,3]. This approach effectively increases seismicity rates in regions with no significant historical or instrumental seismicity, while decreasing seismicity rates in regions that display higher rates of seismicity. In contrast, the use of SSZ based on concentrations of seismicity or spatial smoothing results in stationary behavior [4]. In the FP7 Project SHARE (Seismic Hazard Harmonization in Europe), seismic hazard will be assessed with a logic tree approach that allows for three types of branches for seismicity models: a) smoothed seismicity, b) SSZ, c) SSZ and faults. In this context, a large-scale zonation model for use in the smoothed seismicity branch, and a new consensus SSZ model for Portugal and Azores have been developed. The new models were achieved with the participation of regional experts by combining and adapting existing models and incorporating new regional knowledge of the earthquake potential. The main criteria used for delineating the SSZ include distribution of seismicity, broad geological architecture, crustal characteristics (oceanic versus continental, tectonically active versus stable, etc.), historical catalogue completeness, and the characteristics of active or potentially-active faults. This model will be integrated into an Iberian model of SSZ to be used in the Project SHARE seismic hazard assessment
Determinação de metodologia para oisolamento de protoplastos de tangerina Cleópatra (Citrus reshni Hort.)
A hibridação somática via fusão de protoplastos vem sendo utilizada no melhoramento de porta-enxertos de citros em diversos países. Nos Estados Unidos, vários estudos demonstram a eficiência de procedimentos no isolamento e cultivo de protoplastos dessa frutífera. O presente trabalho foi realizado com o objetivo de avaliar o efeito do meio de cultivo de calos embriogênicos do porta-enxerto tangerina Cleópatra (Citrus reshni Hort.) sobre o isolamento de protoplastos, bem como sugerir alterações de procedimento. Os resultados mostram a possibilidade do isolamento de 1.4 x 10(6) a 4.7 x 10(6) protoplastos por grama de calos da espécie estudada. Verificou-se que, o subcultivo dos calos de tangerina Cleópatra em meio de cultura, sem reguladores 1 hora, sob condições de escuro a 120 rpm, proporcionou maior eficiência de isolamento de protoplastos (4.7 x 10(6) protoplastos/g de calo).Somatic hybridization has been used for citrus rootstock breeding in many countries. In USA, many reports had proved the efficiency of procedures for the isolation and culture of citrus protoplasts. This research was conducted to evaluate the efficiency of procedures of protoplast isolation using embryogenic callus of the Cleópatra mandarin rootstock. Alterations were proposed to increase protoplast isolation and culture method. Results show the possibility of a protoplast yield of 1.4 to 4.7 x 10(6) pps/g.f.w. for Cleópatra tangerine rootstock callus. Protoplast yield can be raised to 4.7 x 10(6) pps/g.f.w. if the embryogenic callus are grown in a medium supplemented only with 4% sucrose and pre-treated with 1% w/v macerozyme for 1 hour, at 120 rpm, in dark, is applied before protoplast isolation
Evaluation of passiflora seedlings as a function of substrate and tray type
This paper describes the use of two types of styrofoam trays and four different substrates. The efficiency of different substrates and tray types in passionflora (Passiflora edulis var.flavicarpa) seed germination and seedling growth were analysed. The results indicated that both tray types tested are adequate for passionflora germination and seedling growth. Nevertheless the 72 cell tray type had a statistically better performance than the 128 ceU tray type. Substrate III (sand; vermiculite; dung; 1:1:1, supplemented with 10 Kg/m³ simple superphosphate, 6 Kg/m³ potassium chloride, 2 Kg/m³ urea and 8 Kg/m³ Ume) and substrate Plantmax were used in the cells. Both substrates had a superior performance in relation to substrates number I and II.A utilização de bandejas de isopor na produção de mudas de hortaliças e frutíferas vem aumentando em nosso pais, devido às vantagens que esse método apresenta: economia de substrato e de área de viveiro, menor custo no controle de pragas e doenças, produção de mudas de alta qualidade e alto índice de pegamento após o transplante. No caso do maracujazeiro (Passiflora edulis var. flavicarpa), o transplante de mudas é uma prática bastante utilizada para sua propagação. A ocorrência de traumatismos na raiz durante esta fase é significativa, influindo negativamente no desenvolvimento posterior das mudas. O presente trabalho objetivou avaliar a produção de mudas de maracujá em bandejas de isopor, comparando a eficiência de quatro substratos diferentes e dois tipos de bandejas na germinação e desenvolvimento das mudas. Conclui-se que o método de produção de mudas de maracujazeiro em bandejas é eficiente, resultando em mudas de alta qualidade, com elevada porcentagem de pegamento. Verificou-se também que na bandeja de 72 células e nos substratos Plantmax e substrato III (areia: vermiculita: estéreo; 1:1:1, suplementado com 10 Kg/m³ de superfosfato simples, 6 Kg/m³ de cloreto de potássio, 2 Kg/m³ de uréia e 8 Kg/m³ de calcário houve maior porcentagem de germinação e adequado desenvolvimento das mudas
FRAGILIDADE CLIMÁTICA E MORFOPEDOLÓGICA EM UNIDADES GEOAMBIENTAIS DO PARQUE NACIONAL DA SERRA DA CAPIVARA E ENTORNO, PIAUÍ, BRASIL
O trabalho objetiva o mapeamento de unidades ambientais, no PNSC - PI com posterior avaliação de suas fragilidades, considerando os aspectos climáticos, morfológicos e pedológicos. As unidades de maior fragilidade climática foram: as mesas e mesetas e as superfícies dissecadas em estreitos interflúvios do riacho Toca da Onça. As Superfícies Dissecadas em Estreitos Interflúvios dos Riachos Toca da Onça e Baixa do Lima são as mais frágeis morfopedologicamente
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