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- Abstract：To determine the ontogeny of pituitary GH cells and its change during the development of chicken embryos,the pituitary gland were collected from day 3 5 (E3 5) to E20 5 of incubation, and the expression, distribution of pituitary GH were then detected by immunohistochemistry. The results showed that very few scattered GH immunopositive cells were first detected in the caudal lobe of anterior pituitary gland at E9 5 of incubation. After E9 5 of incubation, it was observed that the number of GH positive cells increased, most of which located in the caudal lobe of anterior pituitary gland, and arranged in grape. While the nuclear/cytoplasm ratio between E9 5 and E20 5 gradually decreased. Cell counting results showed that percentage of GH positive cells accounting for total cell number was about 2 % at E9 5, it then kept rising and reached 9 4 % by E16 5 of incubation. These results suggest that the function of GH is much active during the late stage of the developing embryos, and the proliferation and differentiation of pituitary GH cells mostly occur between mid incubation and before birth.Keywords：chick embryo,anterior pituitary gland,growth hormone,immunohistochemitry0|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Keywords：conjugated linoleic acid,lactic acid bacteria,Lactobacillus plantarum0|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：A simplified method was developed to determinate amylose content in paddy rice. Scanner was used to collect the original image of the iodine colored solution and the hue of the image was then identified by the computer. There is a significant correlationship between the red value and amylose content. It is possible to predict the content of amylose by using this new test method without the tradilionally used spectrophotometer. With the advantage of low cost, rapidness, high efficiency, the method is hopefully to be used in rice trade process.Keywords：rice,amylose,hue,identify0|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Keywords：Bashang region,ridge in a field,wind-blown mass,field wind tunnel1|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：The characteristic of agriculture production in cold, windy and sandy areas was discussed and the key problem that must be resolve in order to extend the conservation tillage technology was researched. The effects of different conservation tillage system on the increase of yield and reduce windy erosion were studied. The result of experiment showed that in cold, windy and sandy areas, mechanization of conservation tillage can be developed to increase water 50 %-67% compared to the traditional tillage, reach to 7?680?m 3/hm 2, and enough for the spring wheat growing. Compared to the tradition tillage, the capacity of mechanization conservation tillage reducing the sand is higher about 33 1 %-48 3% . The income increase about 1?120 yuan per hectare.Keywords：conservation tillage,technology system,cold,windy and sandy areas2|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：The objective of this study was to determine the effects of chemical treatment after electric activation in different intervals on the parthenogenetic development of porcine oocyte. Porcine oocytes were cultured in vitro for 0 (control), 3, 4, 5 and 6?h after electrical activation, they were then incubated in 6 DMAP/CHX. There were no significant differences ( P >0 05) in the mean numbers of nuclei per blastocysts and cleavage rate. But the blastocysts rate of the control group with 6 DMAP was significantly higher than other groups ( P <0 05). Blastocyst rate of the control group with CHX was higher than the groups with 5 and 6?h intervals, ( P <0 05). In the parallel study, there were no significant differences in the cleavage rates ( P >0 05), but the blastocyst rate of the control group was higher than other groups ( P <0 05) The blastocysts cultured in control almost were diploids, while most blastocysts in other groups were haploids, and there was no significant difference ( P >0 05) . These results demonstrate that the activatiing effect gradually declines as the interval time gets longer, and most blastocystes activated by electricity and 6 DMAP, CHX, CB+6 DMAP (with 4?h interval between them) mostly are haploid.Keywords：porcine,oocytes,parthenogenetic development,karyotype0|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：In order to discuss the effects of different additives on the quality of Alfalfa silage, molasses,formic acid,lactobacillus and enzyme were chosen to do with the raw material solely or jointly, and local evaluation, lab evaluation, biology evaluation, and aerobic stability experiments were involved to analysis the silage after opening. The study showed that the comprehensive score of sense, moisture content and pH of alfalfa silage treated with different additives were all higher than the control. Molasses reduced the lactic acid ratio of alfalfa 1 and alfalfa 2 by 47 % and 32 % , raised NDF digestibility by 10 % and 22 % respectively and improved the aerobic stability of alfalfa 1 efficiently; lactobacillus reduced lactic acid content but raised acetic acid content. Also it improved NDF digestibility by 26 % and 18 % respectively; enzyme improved the animal digestibility; lactobacillus and enzyme reduced the lactic acid ratio by 37 % and 39 % , improved the animal digestibility and silage nutrition efficiently; formic acid reduced acetic acid ratio by 31 %,25% , increased the NDF digestibility by 19 %,14% respectively and restrained the decomposition of protein and aminophenol. In general, the fermentation and nutrition of alfalfa 2 was superior to alfalfa 1(P<0 05).Keywords：additives,alfalfa,silage2|2|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Keywords：tri-basic copper chloride,sulfur,copper metabolism,copper source,sheep1|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Keywords：cashmere goats,during the cashmere growing period,copper level3|6|0<HTML><L-PDF> <Meta-XML>Updated：2023-12-22
- Keywords：broiler chickens,heat stress,femoral artery pressure0|6|0<HTML><L-PDF> <Meta-XML>Updated：2023-12-22
- Abstract：The objective of the present study was to investigate the apoptosis and dynamic expression of Bcl 2 or Bax in lymphocytes of bursa of 21 day old SPF chickens infected with BC6/85 from the first to ninth day post infection(PI). The apoptosis was observed by electron microscope, the apoptotic rate was assessed by TUNEL method, and the expressions of Bcl 2, Bax were investigated by immunohistochemical ABC method. The results showed that the apoptosis of lymphocytes in bursa of chickens infected with BC6/85 from the third to fifth day PI significantly increased than that of normal SPF chickens( P <0 01). The expression of Bcl 2 or Bax was significantly increased in lymphocytes of bursa of SPF chickens infected with BC6/85 from the third to fifth day PI than in those of normal chickens( P <0 01). The ratio of Bcl 2 to Bax was significantly decreased compared with that of normal chickens from the third to fifth day PI( P <0 01). The results demonstrate that a great deal of lymphocyte disappearance in the bursa of SPF chickens infected with BC6/85 from the third to fifth day is related to apoptosis. The ratio Bcl 2 to Bax could precisely reflect the degree of lymphocyte apoptosis of bursa.Keywords：special-pathogen-free chicken,virulent IBDV,bursa,apoptosis,Bax,Bcl-24|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Keywords：electroless composite plating,Ni-P-MoS2,surfactant0|6|0<HTML><L-PDF> <Meta-XML>Updated：2023-12-22
- Abstract：The method by which the movements of 7R mechanism can be analyzed all sidedly was introduced. The method of rotation vector was used to build the mathematical model of the 7R spatial mechanism. The kinematic quality of the 7R Mechanism was analyzed with the method of numerical differential and transferring function of MATLAB, the velocity and acceleration of any point on any link were figured out and expressed by the drawing functions. The trajectory, velocity and acceleration of any point on any link were analyzed through the examples. The results can be used as the fundation of theory when the other spatial mechanism is to be analysed.Keywords：spatial mechanism,7R mechanism,motion analysis1|6|0<HTML><L-PDF> <Meta-XML>Updated：2023-12-22
- Keywords：wind energy,heat utilization system,wind turbine,aerodynamic performance1|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：Sequence id is one of the most popular method in telecom network which is used to check and resend the lost message and packages. The application of sequence id in transportation of message in the Sinternet was studied, and the rules, command format and flow chart using the sequence id were expatiated. Also the characteristics and using limitation of sequence id method were mentioned. We have applied the sequence id method to the information system of highway cargo freight. The operation results showed that the sequence id method is simple and easy to apply, and the application of it can save loads of time for both client and server. It therefore can be used in systems which have larger data flow and less concern for data integration.Keywords：sequence Id,message transport,error control1|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：A switching device which can be used in a artificial system was introduced. The basic theory of communicating switching and its process of designing was presented. On the base of testing CRC verified method, the possibility realizing scheme was put forward. This device has been developed successfully and put into application.Keywords：switching,MT8816,CRC checking0|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：The quasi Shannon wavelet has explicit boundary effect which results in poor calculation accuracy. A quasi Shannon interval wavelet is constructed based on the concept of interpolation wavelet to overcome that shortcoming. The quasi Shannon wavelet scale function and the quasi Shannon interval wavelet scale function were both used to simulate a continuous function f(x) . The zero continuation method was used in the simulation and the value of collocate point parameter j was specified as 4 and 5. With the increasing of parameter j , the error at x =0 becomes more and more outstanding relative to that at other points, and the numerical precision becomes higher in whole solution domain. It is inspiring that the error is smaller and the Gibbs phenomenon is weaker near the boundary even as j =4. The comparison of the simulation results and corresponding error indicates the quasi Shannon interval wavelet can eliminate the boundary effect effectively and have higher calculation exactness than the quasi Shannon wavelet.Keywords：quasi-Shannon interval wavelet,numerical approximation,boundary effect2|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：Combining with the spatial domain algorithms, a new adaptive digital image watermarking algorithm was developed. The robustness of this algorithm was tested by the correlation coefficient between the watermarking signals embeded and ones detected in the Jpeg image. With the reducing of the image quality, the correlation coefficient decrease slowly, and this shows the robustness of the algorithm proposed in this paper is better.Keywords：wavelet,digital watermarking,robustness0|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Keywords：Golden Empress melon juice,SPME,irradiation,off-flavor0|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：Through kernel principal composition analysis, a new method of comprehensive evaluation was made for the sensory and physiochemical quality of sixteen kinds of fermented bean curd from markets. By using the kernel functions, one can efficiently calculate principal compositions in high dimensional feature spaces, related in input space by some nonlinear map. The results showed that the maximum eigenvalue contributes nearly 85 % by choosing appropriate parameters, avoiding the different array as a result of many principal composition. KPCA should have a good performing in comprehensive analysis of the quality of fermented bean curd.Keywords：kernel principal composition analysis (KPCA),sensory and physiochemical quality,comprehensive evaluation2|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Keywords：chitosan,duck egg,fresh-keeping,eggshell treatment1|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：As a part of the construction item of tractor working set test bed, this design emphasizes to resolve the problem of automated transmission on the imitation experiment flat. The automated transmission system was empoldered. At the same time the electronic control system was developed meanwhile the soft and hardware was debugged successfully. The system was developed with C96 high class language based on 80C196KC CMOS chip. The control system can judge the tractor running state according to the collecting data, and drive the control system to change shift automatically, so that the fuel cost can be reduced and efficiency can be increase. The experiment result showed that electrical automated mechanical transmission can select appropriate block, according to the given shift. Using the system on the tractor, it can make tractor's shift automatic and adjust the block with the exterior load.Keywords：automated mechanical transmission,singlechip,electronic control cell,executive organ0|1|0<HTML><DownloadPDF> <Meta-XML>Updated：2023-12-22
- Abstract：Based on location theory and system modelling methods, the location factors were quantified through establishing the location advantage models (including economic attraction model and spatial aggregation model) and location feasibility models. The location advantage grades and location feasibility types in Daxing district were classified according to the results of location models. The results indicated that Hangcun town had higher location advantage and the best feasibility. Yizhuang town obtained the best location advantage and the higher feasibility because of their different location conditions. The location model systems were appropriate, and the practical problems of the small town could be well explained by the grading system of location advantage and the classification system of location feasibility. The system was suitable to analysis the advantages and disadvantages of the small town, and could supply with the criterion and gist of the development trends.Keywords：small town,location advantage,location feasibility3|6|0<HTML><L-PDF> <Meta-XML>Updated：2023-12-22
