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ABSTRACT Introduction: Specialized perception in tennis is simply learning the "feel of the ball". Expertise refers to whether a player can handle and control the ball as he wishes, also known as fitness. Objective: Study the effect and mechanism of motion tracking training to improve the perception training methods of tennis players. Methods: This paper conducts a temporal experiment on 38 professional tennis players divided into two groups. The experimental group used optokinetic tracking training for tracking and feedback on their movements. The control group received no interventional treatment. Players' perception and brainwave data at different training times were recorded and analyzed. results: The subjects in the experimental group had high accuracy in discriminating the spatial location of the ball. The experiment produced a significant occipital M1 signal after the 360ms trial. The M2 signal in the occipital region also had noticeable main effects in each period. The level of the M2 signal in the experimental group showed an increase. Conclusion: Visual motion tracking training has been shown to significantly impact tennis players' perception. This training can improve tennis players' perceptual ability, proving to be an ally in strengthening current training methods. Level of evidence II; Therapeutic studies - investigation of treatment outcomes.
RESUMO Introdução: A percepção especializada do tênis é simplesmente o aprendizado da "sensação de bola". A especialização refere-se a se um jogador pode manusear e controlar a bola como ele deseja, conhecida também como aptidão física. Objetivo: Estudar o efeito e o mecanismo do treinamento de rastreamento de movimento para melhorar os métodos de treinamento da percepção dos jogadores de tênis. Métodos: Este trabalho conduz um experimento temporal em 38 jogadores profissionais de tênis, divididos em dois grupos. O grupo experimental utilizou o treinamento de rastreamento opto cinético para rastreamento e feedback de seus movimentos. O grupo de controle não recebeu nenhum tratamento intervencionista. Foram registradas e analisadas a percepção dos jogadores e os dados de ondas cerebrais em diferentes momentos do treinamento. Resultados: Os sujeitos do grupo experimental tiveram uma alta precisão na discriminação de localização espacial da bola. O experimento foi capaz de produzir um sinal M1 occipital significativo após o ensaio de 360 ms. O sinal M2 na região occipital também teve efeitos principais perceptíveis em cada período. O nível do sinal M2 no grupo experimental demonstrou um aumento. Conclusão: O treinamento visual de rastreamento de movimento demonstrou refletir um impacto significativo sobre a percepção dos tenistas. Este treinamento pode melhorar a capacidade perceptiva dos jogadores de tênis comprovando-se um aliado no reforço nos métodos atuais de treinamento. Nível de evidência II; Estudos terapêuticos - investigação dos resultados do tratamento.
RESUMEN Introducción: La percepción especializada en el tenis consiste simplemente en aprender a "sentir la pelota". La pericia se refiere a si un jugador puede manejar y controlar el balón a su antojo, lo que también se conoce como aptitud física. Objetivo: Estudiar el efecto y el mecanismo del entrenamiento de seguimiento del movimiento para mejorar los métodos de entrenamiento de la percepción de los tenistas. Métodos: Este trabajo realiza un experimento temporal con 38 tenistas profesionales, divididos en dos grupos. El grupo experimental utilizó el entrenamiento de seguimiento opto cinético para el seguimiento y la retroalimentación de sus movimientos. El grupo de control no recibió ningún tratamiento de intervención. Se registraron y analizaron los datos de percepción y de ondas cerebrales de los jugadores en diferentes momentos del entrenamiento. Resultados: Los sujetos del grupo experimental tuvieron una alta precisión en la discriminación de la ubicación espacial de la pelota. El experimento fue capaz de producir una señal M1 occipital significativa después del ensayo de 360 ms. La señal M2 en la región occipital también tuvo efectos principales notables en cada período. El nivel de la señal M2 en el grupo experimental mostró un aumento. Conclusión: Se ha demostrado que el entrenamiento de seguimiento visual del movimiento refleja un impacto significativo en la percepción de los tenistas. Este entrenamiento puede mejorar la capacidad perceptiva de los tenistas demostrando ser un aliado en el fortalecimiento en los métodos de entrenamiento actuales. Nivel de evidencia II; Estudios terapéuticos - investigación de los resultados del tratamiento.
ABSTRACT
@#Abstract: Objective To understand the kdr (knockdown resistance, kdr) gene mutation of the voltage-gated sodium channel (VGSC) of Anopheles sinensis in Yunnan Province. Methods From 2018 to 2019, mosquitoes were collected in Luoping County, Suijiang County, Tengchong City, Yingjiang County, Yuanjiang County and Mengla County in Yunnan Province. The collected mosquitoes were morphologically identified as Anopheles sinensis and genomic DNA was extracted by kits. The DNA templates were sequenced after PCR amplification and the sequencing results were identify as Anopheles sinensis by homology alignment in NCBI. After the ⅡS5 and ⅡS6 fragments of the sodium channels in Anopheles sinensis were amplified and sequenced, the sequencing results were multiple aligned by DNAMAN software, and the mutations were analyzed one by one with BioEdit software to determine the kdr allele types and genotypes, and the frequencies were calculated. Results This survey amplified 287 sequences, and the sequence maps showed that 1014 loci had three alleles, including wild type TTG/L (89.20%), mutant type TTT/F (9.76%) and TCG/S (1.04%). Five genotypes: homozygous wildtype L/L (85.02%), homozygous mutant F/F (6.27%) and S/S (0.35%), heterozygous mutant L/F (6.97%) and L/S (1.39%). The wild type allele TTG/L was the main allele in six sampling sites except Suijiang County. The frequency of wild type allele in Tengchong City was the highest (100.00%). That is, no mutation was detected, while the rest of counties occurred different degrees of mutation at 1014 loci. The frequency of mutant allele in Suijiang County was the highest, reaching 55.68%. Luoping County, Mengla County and Suijiang County had two mutant types. Yingjiang County and Yuanjiang County had one heterozygous mutant L/F. Conclusion Wild type L1014 (TTG/L) is still dominant in most areas of Yunnan Province. The kdr mutation type is mainly L1014F, followed by L1014S, and the mutation frequency is lower than that in central provinces of China.
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Homochiral metal-organic frameworks(MOFs)have attracted considerable attention in many fields of research,such as chiral catalysis and chiral chromatography.However,only few homochiral MOFs can be effectively used in capillary electrochromatography(CEC)and their performances are far from adequate.In this study,we successfully synthesized achiral nanocrystalline MIL-53.A facile post-synthetic modi-fication strategy was then implemented to functionalize the product,yielding a homochiral MOF:L-His-NH-MIL-53.This MOF was then employed as a chiral coating in open-tubular CEC mode(OT-CEC),and,as such,it exhibited high enantioselectivities for several racemic drugs.The homochiral MOF and the fabricated capillary coating were systematically characterized using transmission electron microscopy,scanning electron microscopy(with energy-dispersive X-ray spectrometry),Fourier-transform infrared spectroscopy,X-ray diffractometry,thermogravimetric analysis,circular dichroism spectroscopy,Bru-nauer-Emmett-Teller surface area measurements,and X-ray photoelectron spectroscopy.This study is expected to provide a new strategy for the design and establishment of MOF-based chiral OT-CEC systems.
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Purpose: The purpose of this study was to identify measles virus in Shanghai in 2012 and study the genotype trend of measles virus epidemic strains during 2000–2012. Methods: Nose and throat swab specimens were collected from 34 suspected measles cases in Shanghai. Measles virus was isolated using Vero-SLAM cells (African green monkey kidney cells/lymphoid signal activating factor-transfected African green monkey kidney cells). The 450 bp of C terminus of the N gene and the entire hemagglutinin gene sequence was amplified using RT-PCR. Phylogenetic analysis was performed by comparing the seven measles strains in Shanghai with the reference strains for H1a, H1b and D8 genotypes, as well as the Chinese measles virus vaccine strain. Results: Seven measles viruses strains were isolated from the 34 throat swap specimens. Six strains were genotype H1a, which is the predominant strain in China and one strain was genotype D8, which is the first imported strain since 2000. All these seven strains maintained most of the glycosylation sites except subtype H1a, which lost one glycosylation site. Conclusion: Since 2000, measles virus strains in Shanghai are consistent with measles virus from other provinces in China with H1a being the predominant genotype. This study is also the first report of genotype D8 strain in Shanghai. All strains maintained their glycosylation sites except H1a that lost one glycosylation site. These strains could still be neutralized by the Chinese measles vaccine. We suggest that Shanghai Center for Disease Control laboratories should strengthen their approaches to monitor measles cases to prevent further spread of imported strains. .