Effects of Water Management,Arsenic and Phosphorus Levels on Rice Yield in High-Arsenic Soil-Water System

Aerobic rice （Oryza sativa L.） cultivation is considered an alternative production system to combat increased water scarcity and arsenic （As） contamination in the food chain. Pot experiments were conducted at the Wheat Research Centre, Dinajpur, Bangladesh to examine the role of water management （WM）, As and phosphorus （P） on yield and yield attributes of boro （variety BRRI dhan 29） and aman （variety BRRI dhan 32） rice. A total of 18 treatment combinations of the three levels of As （0, 20 and 40 mg/kg） and P （0, 12.5 and 25.0 mg/kg） and two WM strategies （aerobic and anaerobic） were investigated. Yield attributes were significantly affected by increasing As levels. Grain yields of BRRI dhan 29 and BRRI dhan 32 were reduced from 63.0 to 7.7 and 35.0 to 16.5 g/pot with increasing As application, respectively, indicating a greater sensitivity of BRRI dhan 29 than BRRI dhan 32. Moreover, As toxicity was reduced with aerobic compared to anaerobic WM for all P levels. During early growth stages, phytotoxic symptoms appeared on BRRI dhan 29 and BRRI dhan 32 rice stems with increasing As levels without applying P under anaerobic WM. Under anaerobic and As-contaminated conditions, BRRI dhan 29 was highly susceptible to straighthead, which dramatically reduced grain yields. There were significant relationships between the number of effective tillers per pot and root dry weight, grain yield, and number of fertile and unfertile grains per pot for both BRRI dhan 29 and BRRI dhan 32 （P＆lt;0.001）. Our findings indicate that rice could be grown aerobically in As-contaminated areas with a reduced risk of As toxicity and yield loss.

Development Of China's Space Telemetry Technology

Space telemetry systems are an essential part of the TT&C system and play a very important role in the development and application of launch vehicles,satellites and spaceships. China's space telemetry technology has been developing along with the development of its space industry.

A Controlled Study on the Effect of Preoperative Nutritional Assessment and Intervention on the Clinical Efficacy of Patients with Esophageal Cancer

The purpose of this study was to analyze the effect of preoperative nutritional assessment and intervention on the clinical efficacy of patients with esophageal cancer.First,110 patients with esophageal cancer admitted to our hospital from December 2014 to December 2016 were selected,including 78 males and 27 female were randomly selected as the observation group and control group.In the observation group,26 cases received nutritional support,22 cases did not receive nutritional support,15 cases in the control group,47 cases did not receive nutritional support.The non-protein calories were no less than 41.8kj•kg-1•d-1.Albumin(PAB),transferrin(TRF)and albumin(ALB)were tested before,1 and 5 days after surgery.IgA,IgG and IgM were detected by immunosuspension analyzer.Flow cytometry was used to detect CD3 and CD4.The incidence of postoperative complications(incision infection,pulmonary infection,anastomotic fistula,chylothorax,bleeding,esophagotracheal fistula,cardiovascular complications,and digestive tract diseases)was observed.The results showed that 48 patients(43.64%)in the observation group had nutritional risk(≥3 points),while 62 patients(56.36%)in the control group had no nutritional risk(<3 points).There were statistically significant differences between the observation group and the control group in gender,degree of differentiation,etc.(P<0.05),but no significant differences in age,complications,tumor size,metastasis,lymph node metastasis,etc.(P>0.05)postoperative indicators showed that all indicators continued to decline.The level of immune factors in the nutrition support group was higher than 1 day before surgery and close to the preoperative level.This indicated that effective preoperative nutritional support for esophageal cancer patients with nutritional risk can inhibit the decomposition of immunoglobulin,which is conducive to the recovery of postoperative immune function and improve the tolerance of the body to comprehensive tumor treatment.At the same time,the incidence of postoperative complications in the nutritional support group was significantly lower than that in the non-nutritional support group,indicating that active preoperative nutritional support intervention can reduce the occurrence of postoperative complications and improve the prognosis of patients.