ABSTRACT Introduction: A series of reforms in table tennis involving the development trend of table tennis technology and the needs of athletes to improve competitive ability and prevent injuries have presented new requirements for the abdominal center strength of athletes. Objective: Study the impacts of implementing abdominal center strength training on the training of table tennis players. Methods: A broad literature search and experimental comparison were performed. Twenty professional athletes aged 14 to 20 from the men's table tennis team were selected as volunteers for the research, divided into two groups according to the mean, standard deviation, and results of special technical tests. An independent sample t-test was performed on both groups. Results: Significant differences were found for abdominal control, for legs and arms crossed on both ends, for supine posture, and for leg raising (P<0.05). Conclusion: Abdominal center strength training can effectively improve the special ability level of young table tennis players, improve the body control ability in players, and the stability of the shot action. Level of evidence II; Therapeutic studies - investigating the results of treatment.

RESUMEN Introducción: Una serie de reformas en el tenis de mesa relacionadas con la tendencia de desarrollo de la tecnología del tenis de mesa y las necesidades de los atletas para mejorar la capacidad competitiva y prevenir las lesiones han presentado nuevos requisitos para la fuerza del núcleo abdominal de los atletas. Objetivo: Estudiar los impactos de la implementación del entrenamiento de la fuerza del núcleo abdominal en el entrenamiento de los jugadores de tenis de mesa. Métodos: Se realizó una amplia investigación bibliográfica y una comparación experimental. Se seleccionaron como voluntarios para la investigación 20 atletas profesionales con edades comprendidas entre los 14 y los 20 años del equipo masculino de tenis de mesa, divididos en dos grupos según la media, la desviación estándar y los resultados de las pruebas técnicas especiales. Se realizó una prueba T de muestras independientes en los dos grupos. Resultados: Se encontraron diferencias significativas para el control abdominal, para las piernas y los brazos cruzados de ambas extremidades, para la postura supina y para la elevación de las piernas (P<0,05). Conclusión: El entrenamiento de la fuerza del núcleo abdominal puede mejorar eficazmente el nivel de habilidad especial de los jóvenes jugadores de tenis de mesa, mejorar la capacidad de control del cuerpo en los jugadores y la estabilidad de la acción de tiro. Nivel de evidencia II; Estudios terapéuticos - investigación de los resultados del tratamiento.

RESUMO Introdução: Uma série de reformas no tênis de mesa que envolvem a tendência de desenvolvimento da tecnologia do tênis de mesa e as necessidades dos atletas para melhorar a capacidade competitiva e prevenir lesões tem apresentado novos requisitos para a força do centro abdominal dos esportistas. Objetivo: Estudar os impactos da implementação do treinamento de força no centro abdominal no treinamento dos jogadores de tênis de mesa. Métodos: Efetuou-se vasta pesquisa bibliográfica e comparação experimental. Foram selecionados 20 atletas profissionais com idade entre 14 e 20 anos da equipe masculina de tênis de mesa como voluntários para pesquisa, divididos em dois grupos de acordo com a média, desvio padrão e resultados de testes técnicos especiais. Realizou-se um teste T de amostra independente nos dois grupos. Resultados: Foram encontradas diferenças significativas para controle abdominal, para pernas e braços cruzados de ambas as extremidades, para postura supina e para levantamento de pernas (P<0.05). Conclusão: O treinamento da força do centro abdominal pode efetivamente melhorar o nível de habilidade especial dos jovens jogadores de tênis de mesa, melhorar a capacidade de controle corporal nos jogadores e a estabilidade da ação dos tiros. Nível de evidência II; Estudos terapêuticos - investigação dos resultados do tratamento.

Abstract Objective: The objective of the study was to systematically evaluate the effect of coronary artery bypass grafting (CABG) or CABG combined with mitral valve surgery (cMVS) on post-operative survival in patients with moderate ischemic mitral valve regurgitation. Materials and methods: Databases including PubMed, Web of Science, COCHRANE LIBRARY, WanFang Data, and CNKI Data were searched from inception to January 2020. According to the inclusion criterion, relevant articles were screened. After that we extracted data, assessed quality, and performed meta-analysis using RevMan 5.2. Results: A total of 4 randomized controlled trial and 14 retrospective study involving 4476 patients were included in the study. The CABG group was 2278 and the cMVS group was 1698. The results of meta-analysis showed that compared with CABG group, there were no statistically significant differences in the recent mortality (odds ratio [OR] = 0.88, p = 0.62), 1-year survival (OR = 1.03, p = 0.82), 1-year survival (OR = 1.07, p = 0.62), and long-term survival (OR = 0.95, p = 0.61) of the cMVS group. Conclusion: Current evidence indicates that patients in the cMVS group did not benefit from CABG group in survival after surgery.

Resumen Objetivo: . Evaluar sistemáticamente el efecto del injerto de derivación de la arteria coronaria (CABG) o el injerto de derivación de la arteria coronaria combinados con la cirugía de la válvula mitral (cMVS) sobre la supervivencia posoperatoria en pacientes con insuficiencia valvular mitral isquémica moderada. Material y métodos: . Se realizaron búsquedas en bases de datos que incluyen Pubmed, Web of Science, COCHRANE LIBRARY, WanFang Data y CNKI Data desde el inicio hasta enero de 2020. De acuerdo con el criterio de inclusión, se seleccionaron los artículos relevantes. Después de eso, extrajimos los datos, evaluamos la calidad y realizamos el metanálisis con RevMan 5.2. Resultados: . Se incluyó un total de 4 ensayos controlados aleatorios (ECA) y 14 estudios retrospectivos con 4476 pacientes. El grupo CABG fue 2278, el grupo cMVS fue 1698. Los resultados del metanálisis mostraron que, en comparación con el grupo CABG, no hubo diferencias estadísticamente significativas en la mortalidad reciente (OR = 0.88, p = 0.62), supervivencia a 1 año (OR = 1.03, p = 0.82), supervivencia a 1 año (OR = 1.07, p = 0.62) y supervivencia a largo plazo (OR = 0.95, p = 0.61) del grupo cMVS. Conclusión: . La evidencia actual indica que los pacientes del grupo cMVS no se beneficiaron del grupo CABG en la supervivencia después de la cirugía.

Abstract The amylose content (AC) of rice is a key determinant of the grain cooking and eating quality. The Waxy (Wx) gene, which encodes granule-bound starch synthase I (GBSSI), is the major gene controlling AC in rice. The A - C substitution in exon 6 (Ex6A/C) alters the amino acid codon from serine to tyrosine and is associated with intermediate-AC rice (Wx-in). In this paper, we reported a perfect functional marker for the SNP Ex6A/C of Wx-in based on polymerase chain reaction with confronting two-pair primers (PCR-CTPP) in a single-tube PCR assay. Specificity and applicability of the PCR assay were verified in a Chinese mini core collection (MCC) of Oryza sativa L. and a breeding population. Were commend the use of the simple, inexpensive assay for routine genotyping for intermediate AC in the breeding population or discrimination of Wx-in genotypes in rice germplasm.

ABSTRACT This study aimed to explore the effects of two siderophore-producing bacterial strains on iron absorption and plant growth of peanut in calcareous soil. Two siderophore-producing bacterial strains, namely, YZ29 and DZ13, isolated from the rhizosphere soil of peanut, were identified as Paenibacillus illinoisensis and Bacillus sp., respectively. In potted experiments, YZ29 and DZ13 enhanced root activity, chlorophyll and active iron content in leaves, total nitrogen, phosphorus and potassium accumulation of plants and increased the quality of peanut kernels and plant biomass over control. In the field trial, the inoculated treatments performed better than the controls, and the pod yields of the three treatments inoculated with YZ29, DZ13, and YZ29 + DZ13 (1:1) increased by 37.05%, 13.80% and 13.57%, respectively, compared with the control. Based on terminal restriction fragment length polymorphism analysis, YZ29 and DZ13 improved the bacterial community richness and species diversity of soil surrounding the peanut roots. Therefore, YZ29 and DZ13 can be used as candidate bacterial strains to relieve chlorosis of peanut and promote peanut growth. The present study is the first to explore the effect of siderophores produced by P. illinoisensis on iron absorption.

The growth of ratoon rice (Oryza sativa L.) is affected by growth of main rice, so it could be evaluated by determining growing condition of main rice. Objective of the study was to find regression model for predicting ratoon rice growth rhythm through establishing the quantitative relationship between growth rhythm in ratoon rice and normalized difference vegetation index (NDVI) after heading of main rice. NDVI at key growth stages of main rice was measured using active spectrometry for 12 varieties in 2008 and for 23 varieties in 2009, and compared the physiological indexes of main and ratoon rice. There was an exponential correlation (P < 0.05) between the NDVI after heading of the main rice and biomass, N concentration of green leaves and stems or leaf area index (LAI) after heading of the ratoon rice for all the 12 varieties in 2008. The regression models from the rice variety experiment in 2008 were used to calculate predicted values with NDVI after heading of main rice in 2009. The results showed that the predicted values of biomass, N uptake, and LAI in ratoon rice were significantly different to measured values. However, there were exponential and significantly positive correlation (p < 0.05) between biomass and N uptake and LAI in ratoon rice and NDVI after heading of main rice in 2009. Therefore, it suggested that regression models were not perfect, and need to be improved adding more parameters about spectral characteristic of main and ratoon rice.

Thymosin alpha 1 (Tα1) has been shown to have beneficial effects on numerous immune system parameters, but little is known about the effects of Tα1 on patients with gastric carcinoma. The objective of this study was to determine the effect of Tα1 on subpopulations of Th1, Th2, Th17, and regulatory T cells (Tregs) in vitro, and to evaluate its efficacy as an immunoregulatory factor in patients with gastric carcinoma. We compared the effect of Tα1 on the frequency of CD4+ and CD8+ T cells, especially the CD4+CD25+Foxp3+ Tregs in peripheral blood mononuclear cells (PBMCs) from gastric carcinoma patients (N = 35) and healthy donors (N = 22). We also analyzed the changes in the proliferation of PBMCs in response to treatment with Tα1, and examined the production of Th1, Th2, and Th17 cytokines by PBMCs and tumor-infiltrating lymphocytes. The treatment of PBMCs from gastric cancer patients, with Tα1 (50 µg/mL) alone increased the percentage of CD4+CD25+Foxp3+ (suppressive antitumor-specific Tregs) from 1.68 ± 0.697 to 2.19 ± 0.795% (P < 0.05). Our results indicate that Tα1 increases the percentage of Tregs and IL-1β, TNF-α, and IL-6 in vitro.