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Crop straw resources are abundant in China, but the low nutritional value, poor palatability and other problems limit its application in feed. Microbial fermentation provides an effective way to reduce the cost and increase the efficiency of straw utilization. Saccharomyces cerevisiae, as the core component of fermentation compound, plays an important role in improving protein content, optimizing amino acid composition, improving palatability and increasing utilization rate of fermented feed. In the paper, the development of enabling feed saccharomyces cerevisiae, the effect of Saccharomyces cerevisiae on the quality of straw fermented feed and its application in ruminants were summarized, in order to provide reference for further research and application of straw fermented feed. [ABSTRACT FROM AUTHOR]

The paper aims to optimize the ultrasound cell disruption auxiliary extraction process of polyphenols from Chinese yam leaves. Based on the results of single-factor experiments, taking ultrasonic time, ultrasonic power and ethanol concentration as the influencing factors, and polyphenol content as the evaluation index, the extraction process was optimized by the response surface method. The antioxidant and bacteriostatic activity were determined by DPPH free radicals removal experiment and double ratio dilution method. The optimal extraction process was as follows: Ultrasonic time of 9.0 min, ultrasonic power of 310 W, ethanol concentration of 57%, extraction time of 50 min, extraction temperature of 60 °C, liquid-material ratio of 25 mL/g. Under these condition, the actual extraction amount of yam leaf polyphenols was 18.88 mg/g. The study indicates that polyphenols from Chinese yam leaves have a strong scavenging effect on DPPH free radicals, and have good inhibitory effects on Escherichia coli, Bacillus subtilis andStaphylococcus aureus. [ABSTRACT FROM AUTHOR]

A laboratory investigation of solidilication ol copper contaminated soil by Ily ash based geopolymer with bottom ash(BA-FAG) was carried out The ellects of curing time, binder content and initial copper content on the solidilication ol copper contaminated soil were studied by Unconlined Compressive Strength (UCS), toxic leaching test, X-Ray Dillraction(XRD), scanning Electron Microscopy(SEM) and X-ray Photoelectron Spectroscopy (XPS). The results showed that the UCS value of BA-FAG solidified soil can be increased together with the decrease of leaching concentration ol copper ion by increasing binder content and curing time. The initial concentration of copper ion in contaminated soil negatively correlated with the strength ol solidified soil, and positively correlated with leaching concentration. The copper contaminated soil with initial concentration of no more than 6 000 mg/kg and 10 000 mg/kg can be solidified by 2()% and 30 % binder contents, respectively. Meanwhile, the UCS values of solidified soil at 28 days of curing are no less than 0. 3 58 MPa and 0. 4 57 MPa, respectively, and the leaching concentration is lower than 100 mg/L at the conditions of both acidic and neutral leaching. The copper in the contaminated soil mainly exists in the form of Cu2+ and Cu(OH) 2 precipitation during the physical encapsulation by BA-FAG. [ABSTRACT FROM AUTHOR]

The deep space exploration activities represented by lunar and planetary space exploration expand human's cognition of physical space from earth space to deep space scene such as Moon, Planet, and even interplanetary space. Deep space environment is both related and significantly different from earth space or planetary space. How to construct the concept of spatial position in deep space exploration environment, clarify the mapping content of scene space, and establish corresponding mapping expression mechanism and visualization methods to meet the needs of deep space exploration task implementation and scientific discoveries, which puts forward new challenges to Cartography. In view of this, based on the latest frontier theoretical thinking on pan-maps and combined with the experience accumulated in the mapping practice of China's deep space exploration mission for a long time, this study attempts to make a unified position association for the multi-scale space involved in the deep space environment, such as the orbit space of celestial bodies and satellites, the space between the Moon and Planets, the space of the probe body, and the mapping content, mapping data visualization technology system is discussed in order to construct a deep space environment mapping method for the integrated spatial visualization of space, planets and instruments in deep space exploration. This study might provide ideas for the development of new mapping products required by China's follow-up deep space exploration missions and corresponding scientific research. [ABSTRACT FROM AUTHOR]

Objectives: Lunar topographic mapping is one of the fundamental research work for lunar topographic study and lunar exploration program. Since China launched the Chang' E -1 probe in 2007, we have officially joined the group of lunar and planetary mapping research. With the successive success of the following lunar exploration missions, China has successfully obtained a large number of lunar topographic data. Using these data, scholars have carried out preliminary research on lunar topographic mapping, the main purpose of this paper is to review and sort out these research results and understand the research progress of Chang' E lunar topographic mapping in China. Methods: Lunar topographic mapping is a subject integrating science, engineering and application. Therefore, in order to understand the progress of China ' s lunar topographic mapping in the Chang' E project, this paper conducts research and combing from the following three aspects. Firstly, from the aspect of engineering, mainly starting from the standard development of lunar topographic mapping, this paper reviews how domestic scholars carry out the standard development work according to the needs of Chang 'E project and related scientific research, starting from the blank, and gradually establish the preliminary research situation of the relevant standard system of lunar topographic mapping, and summarizes the existing standard research results. Secondly, from the aspect of product application, starting from three more commonly used map products, such as lunar atlas product, multimedia map product and lunar globe product, this paper surveys and reviews in detail how domestic scholars design and use reasonable data processing and mapping methods to develop lunar topographic map product according to the quality characteristics of Chang ' E lunar data, and summarizes the lunar map products available. Finally, based on the experience gained from Chang 'E lunar topographic mapping and [ABSTRACT FROM AUTHOR]