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- Keywords：meiosis,ovine oocyte,phosphodiesterase,cyclin-dependent kinase(cdk),0|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：A large culture collection of bifidobacteria (61 strains) was screened or activated from infant fecal samples, un-ablactated pig fecal samples, biotechnological preparations and Bifidobacterium strains conserved in the lab. Using CMRS medium, the intolerance ability of Bifidobacterium strains was studied in imitating gastroenteric environments. Fourteen strains were gained by the first screening; whereas only six obtained by the second screening (pH3 PBS, 1-20mg/mL bile salt concentration). Their survivability was above 93% and the living bacterial number was above 108cfu/mL after in pH3 condition and above 106cfu/mL after 24 h in 5mg/mL bile salt CMRS. Furthermore, B02, A03, A04 and L-1 could survive at 2g/kg bile salt (>104cfu/mL). Ultimately A03, A04 and L-1 show more longanimous to pepsin and pancreatin than others. The living bacterial number was about 108cfu/mL after 1.5 h in simulative gastric juice containing 5mg/mL pepsin, and was about 109cfu/mL after 24 h in simulative intestinal juice containing 1% pancreatin. The result shows that gastrointestinal tract tolerance ability of different Bifidobacterium strains was different; the tolerances of A03, A04 and L-1 were excellent ones among the tested strains, which have a latent ability as the strains of Mirobial Ecological Agents.1|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：Based on the investigation on the agricultural science-technological system, in the United States this paper analysis the operational mechanism in three aspects-research organization of the US Agricultural Department, Agricultural Research and Extension Devices of the Grant-in-aid Universities as well as the research organization in the private enterprises. The main characteristics of the US agricultural science-technology system and operational mechanism were analyzed and summarized. Although those three aspects play different roles in the system, their service objects are different and they get the financial support from different sources, they usually have high efficiency in the system.0|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：Aiming at the requirements of variable irrigation and soil moisture monitor in precision agriculture, an instrument for measuring soil moisture content and its spatial distribution was developed. The instrument is composed of a single-chip microcomputer, a GPS receiver and a SWR moisture sensor. The collected data were analyzed by a GIS software and then the soil moisture spatial-distribution maps were acquired. The experimental results indicated that the instrument provided a scientific basis for soil moisture monitor and variable irrigation.27|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：Tobacco witches' broom symptom disease (TWBSD) is caused by tobacco bushy dwarf virus (TBDV). Insects are the main approach of the disease spread. As a main insect vector of TWBSD, the population dynamics of tobacco leaf bug (TLB) Cyrtopeltis tenuis (Reuter) and the transmission of TBDV by its different instars were studied. The results showed that the population dynamics of TLB changed from year to year. The density of TLB was positively related to incidence of TWBSD. Different instars had different capacities to transfer the virus. During early 12h, the transmission capacity increased with feeding time. The average rate of virus transmission by nymph was higher than that by adultThe 1st stage of TLB had alowest capacity of virus transmission. However, the 4th stage of instars had a highest capacity of virus transmission, inducing 80% TWBSD occurrence. The virus could keep alive in TLB for about 5-8days, longest in the 3rd stage of instars.Keywords：Cyrtopeltis tenuis (Reuter),tobacco witches' broom symptom disease,virus transmission,field population dynamic2|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：The both physical and chemical traits of twenty-eight wheat cultivars were measured respectively and their relationships were analyzed. The results indicated that there were remarkable differences among the samples in quality of each cultivars. The correlative analyses showed that Alkaline water retention capacity (AWRC) was strongly correlated with grain hardness, water-soluble arabinoxylan (WEAX) content and mix tolerance; while swelling power was only tied up with amylase content. Grain protein content was strongly correlated with SDS sedimentation volume, mixogram peak height, but not remarkably with Pelshenke value and mixing time. SDS sedimentation volume showed a significantly positive correlation with Pelshenke value, glutenin macro-polymer (GMP) content, mixing time and mixogram peak height. The chemical basis of SDS sedimentation volume is GMP which is dependent on both quantity and quality of protein; while the mixing time and Pelshenke value are correlated only with protein quality traits. There is no significant correlation between protein quality traits and swelling power or polyphenol oxidase activity (PPO). In conclusion, the AWRC is mainly affected by grain hardness, WEAX and kernel protein traits; the swelling power is only dependent on amylase content; and there are no necessary correlations between PPO and the activities of protein and starch.3|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Keywords：salicylic acid,mango (Mangifera indica L.),anthracnose,disease resistance1|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：The distribution of DNA sequence samples must be known when classifying by the traditional statistical methods, unfortunately, it is unknown in most application cases. This paper mainly developed a DNA sequence classification system based on support vector machines (SVM) by VB and Matlab and proposed an new approach to express the DNA sequence data. The test results showed that the system had the merits of dynamically selecting DNA training samples and the samples to be tested, as well as supporting the parameters in SVM model. The system can also dynamically output the calculating results on demand of users, automatically make a statistics of reorganization rate to investigate the effects of parameters variations on the the computing results for a prediction process of a set of correctly classified DNA sequences.0|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：The interfaces of most PC(IPC)communication software in the market has the problems of individual, enclosed, and less compatibility. The paper developed a VC-based communication approach for the communications between PLC and IPC and adopted PLC-S7-200 of SIEMENS as slave device, which communicate with IPC by RS-485 standard, in the realized system. A user-defined protocol created by freeport mode was taken as the communication protocol, and hexadecimal ASCII code as the form of data transform to verify the sum of ASCII. A non-maskable-interrupt and a multi-buffer structure were adopted and a corresponding controlling pointer was set up during the course of date receiving and sending. The test results indicated that the functions of online surveillance and remote debugging and amending could be realized with code-error less than 10 -5 when transferring data at a speed of 9.6 kbit/s.1|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：The scheduling mode of agro-machineries is mainly manual scheduling in farm of China at present. This scheduling mode has many problems such as low scheduling efficiency and not timely. To solve these problems, a design and implementation of farm short message center (FSMC) was put forward, which was based on GPS,GSM. The FMSC integrated the powerful positioning GPS and good communication GSM, and connected GPS and scheduling center in farm, and realized reasonable scheduling agro-machineries in terms of agro-machineries working situation. The FSMC was based on CMPP2.0 of China Mobile and developed by Java language. Its implementation and design adopted multithreading technology and modularizing method. The experimental results showed that FSMC could deal with short message timely and exactly, whose processing delay was less than 2 seconds per piece and its bit-error ratio less than 0.01%. The FSMC is applicable for a farm with more than 40 agro-machineries.0|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：For effectively sharing of the Real Estate Information and the direction of the Real Estate management,we digitalized relief map,cadastre map and realty map all together, and conjugated separate house with land management information by using house-attached drawing. Base state model with amendments was used to deal with history data. The method of building system was also given in this paper.0|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：A potentiality evaluation model for revegetation of abandoned land from mining activities was developed for identifying the difficulties and the priority of rehabilitation in different regions. Many factors, such as soil quality, climate, landform and the situations of the abandoned land, are involved in this model. The fuzzy function of every factor was built based on the analysis of its effect on revegetation. A fuzzy integrated evaluation algorithm was developed as the primary algorithm in this model. Fu Xin colliery, Liao Ning province in northeast China was selected as the objective of this case study. The evaluation results proved the method useful from the pilot use.16|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
