1996年甘蔗新品种区域化试验研究

对七个甘蔗新品种在我厂农场进行区域化试验，以本省当家品种闽糖７０－６１１为对照种。试验结果通过方差分析和Ｌ．Ｓ．Ｄ．测验，蔗茎产量以闽糖８８－１０３表现最好，其比对照种增产２７．１％；其次为闽糖８５－８４和选－５０，分别比对照种增产２６．７％、２６．２％，以上三个品种增产均达极显著平准。闽糖９０－５２５比对照种增产１３．２％，接近显著平准。其余三个品种比对照种略有增、减产，但均达不到差异显著水平，     

Experiment and analysis of an atmospheric DC glow discharge device

In order to reduce the volume and be used in portable instruments, a line-cylinder atmospheric glow discharge device with a 1.92 mm discharge gap is designed. It mainly consists of an inner line electrode and an outer cylinder electrode. The diameters of the line and cylinder electrodes are 0.16 and 4 mm, respectively. The transition from corona discharge to glow discharge is observed and explained. By using discharge waveform and photo, it has been verified that it is a glow discharge. The calculation methods of vibrational temperature and rotational temperature are deduced by use of the N2 second positive band system. The emission spectrum of the plasma is collected by spectrometer (Acton Spectrapro 2500i). From calculation, it is found that the vibrational temperature of the plasma is about 2 360 K and the rotational temperature of the plasma is about 830 K. The device is used as an ion source in the ambient mass spectrometer. The experiment results show that the plasma generated by DC glow discharge can well ionize the formic acid, acetic acid, and phenol, etc.     

Fluorescence Spectra and Lifetime from Sodium Dodecyl Sulfate

Sodium dodecyl sulfate(SDS) is often used to reinforce the fluorescence of some materials,which need to know the fluorescence from SDS.A steady fluorescence spectrometer was used to analyze the SDS solution with different concentrations.The fluorescence spectra covers longer wavelength scope in ultraviolet light region.The position of the first fluorescence peak ranges from 290 nm to 300 nm with red shift with increase of concentration and fixes at 300 nm as reaching critical micelle concentration.Hereafter,bimodality appears at 300 nm and 330 nm.The first fluorescence peak should derive from the excited oxygen atom between carbon and sulfur.The excited oxygen atom,bonding with sulfur,should generate the peak at 330 nm is traversed.At the same time,fluorescence lifetime of various concentrations SDS.Fitting routine is applied to decay curve and calculates average fluorescence lifetime.The average fluorescence lifetime of SDS becomes long while concentration increasing,and the lifetime at 330 nm is longer than that at 300 nm.     

Markowitz Capital Investment Combination Model'' Easy Algorithm Based on Protrusion Analysis

Markowitz capital investment combination model has been continually mended since it was put forward. However,it has one drawback the data is too hard to be disposed. Markowitz model of equality constraint protrusion analysis is constructed,including the generic restriction conditions. Then a easy algorithm method via the construction of equation group instead of the solving contrary matrix is proposed.     

Application Based on DSP of FPS200 in Embedded System

以甘蓝、花椰菜、大白菜为试材,在冷库中采用地垛式、货架式、差压式3种方法进行预冷,比较了不同预冷方式的预冷速度对蔬菜口感、颜色、新鲜度、腐烂率的影响.结果表明,采用差压预冷方式的预冷时间为7 h左右,比地垛式预冷缩短7～10 h,比货架式预冷缩短3～5 h;经差压式预冷模拟贮藏运输的蔬菜鲜嫩爽口,腐烂率低.差压预冷方式在果蔬保鲜领域中具有潜在的优势.     

Changes in soil free-living diazotrophic community and co-occurrence patterns along desert wetland degradation gradient in the Mu Us Desert, northern China

Climate change and human activity have led to the degradation of desert wetlands. Free-living diazotrophs are vital for soil nitrogen input. However, a comprehensive understanding of how soil free-living diazotrophic communities and their co-occurrence patterns respond to desert wetland degradation is lacking. Here, quantitative polymerase chain reaction (qPCR), amplicon sequencing targeting nitrogenase gene (nifH), and network analysis were used to investigate the abundance, diversity, community composition, and co-occurrence patterns of soil free-living diazotrophs along the wetland degradation gradient, i.e., non-degraded (ND), lightly degraded (LD), moderately degraded (MD), and severely degraded (SD), in the southeastern Mu Us Desert, northern China. The abundance and Shannon, Simpson, Chao 1, and ACE indexes decreased (P < 0.05) by 14.6%, 20.7%, 2.1%, 46.5%, and 45.0%, respectively, in SD wetland, whereas no significant difference (P > 0.05) was observed between ND and LD wetlands. The relative abundance of Proteobacteria generally decreased (by 53.5%–19.7%) across the different degradation levels, while the relative abundance of Cyanobacteria increased (by 6.2%–40.1%) from ND to MD levels. The abundance, diversity, and community composition of diazotrophs were most strongly related to soil organic carbon, followed by total nitrogen, moisture, and pH. The least number of network nodes and edges and the lowest density were observed for MD and SD wetlands, indicating that the complexity of free-living diazotrophic networks was reduced by continued degeneration. Overall, severe desert wetland degradation affected the abundance, diversity, and network complexity of soil free-living diazotrophs more negatively than light degradation. This degradation promoted the growth of autotrophic diazotrophs and inhibited the growth of heterotrophic diazotrophs. These changes were mostly related to the loss of soil organic carbon.     

华北农牧交错带草原一农田群落空间演变机制的研究

研究结果表明,从家田一天然草地群落的空间演变表现出一定的规律,即植物群落可明显聚为三类：农田群落、交错群落和天然草地群落;群落多样性指数（香农Ｈ’）、丰富度指数（Ｒ１、Ｒ２）、均匀度指数（Ｅ１）及物种数量均表现出由低→高→低的变化规律,人类的频繁扰动（耕作）导致土壤理化性状的变化,作物的强烈生长又抑制了一些草原植物的生长,是天然草地一农田群落空间演变的主要原因。     

Enterogenic Stenotrophomonas maltophilia migrates to the mammary gland to induce mastitis by activating the calcium-ROS-AMPK-mTOR-autophagy pathwayOA

Background Mastitis is an inflammatory disease of the mammary gland that has serious economic impacts on the dairy industry and endangers food safety. Our previous study found that the body has a gut/rumen-mammary gland axis and that disturbance of the gut/rumen microbiota could result in ‘gastroenterogenic mastitis’. However, the mechanism has not been fully clarified. Recently, we found that long-term feeding of a high-concentrate diet induced mastitis in dairy cows, and the abundance of Steno...     

种子产业化与种子公司经理

中国是世界上最大的种子生产与消费国,拥有世界上最大的遍布全国各地的种子生产与供应系统,其中国有种子公司系统便包括2200多个县级种子公司、500多个地区种子公司、31个省级种子公司以及同家种子公司。然而,每年农民生产上所采用的1200万吨种子中．由种子公司提供的种子却不到30％,种子的商品率很低。为了进一步了解我国种子市场的发育情况及种子公司经理对种子产业化的看法,中国农业科学院农经所农业政策研究中心分别于1996年与1997年对全国8个省的187个村的村级领导与4个省及23个县的种子公司经理进行了种子市场与种子产业化方面的…