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- Abstract：In order to enrich and improve our understanding of the molecular characteristics of geese Ig,we studied Ig(H L),H chain,L chain,Fab and Fc sections of Wulong goose,and molecular properties of Wulong goose Ig.Results indicated that the IgY molecular weight was 166 ku,H chain was about 60 ku,and L chain was about 23.5 ku.H chain molecular weight of IgM were 51.72 ku,48.30 ku and 44.09 ku respectively and the L chain was 20.30 ku,hence,the molecular weight of IgM was about 660-740 ku.The molecular weight of Ig and H chain were smaller than that of chicken and duck;the molecular weight was 48.67 ku for Fab section and 68.62 ku for Fc section.There was more acid amino acid in IgY,H chain and L chain,and more alkaline amino acid in IgM,H chain and L chain.Therefore,IgY was an acid protein and IgM was an alkaline protein.The mol percentage of Cys was 2.25% in IgY,and 3.26% in IgM;mol percentage of Pro was 7.69% and 0.10% in H and L chain of IgY,and the difference was significant.The stability of IgY in acid and alkali was very steady in the pH range of 3.5 to 11,that of IgM in pH range of 4.0 to 10.5,but worse than IgY,and the activity of IgM increased 5%-8% at pH3.5-4.5;the heat stability of goose IgY was poorer than that of cattle and pig,and the reaction class of IgY was 1.2.2|7|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to assess the effect of irrigation technology on soil salinization in Manas River Valley, Xinjiang, the historical information on characteristics of irrigation technology, groundwater depth and soil salts accumulation in Shihezi cultivated area at key four periods, was analyzed emphatically. Besides, the trends of cultivated land salinization for 2010 and 2020 were also predicted by analogism according to the relationship between soil salinization and irrigation technology. The results revealed that the application of the traditional irrigation methods, such as flood and ridge irrigation, resulted in a rapid increase of groundwater depth and salts accumulation in soil surface layers. With the massive groundwater pumped for irrigation, there was an apparent decrease of groundwater depth and desalinization in soil layers that led to a substantial increase of crop production. Currently the application of mulched drip irrigation decreased the salt content in soil layers and increased the crop yield. With the continuous application of drip irrigation, average soil desalinization efficiency in soil layers was increasing. It was predicted that the percent of salinized land would be reduced to 3,5% -40% when water resource was utilized reasonably in 2010. With the high efficient utilization of water resources after 2020 the salinized land ratio would remain below 30%. It was concluded that with the increase of technological level of irrigation, an obvious desalinization appeared in the soil surface layers and the salinized land area in this study area would decrease, but the land salinization problem would be still existed.3|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Based on the climate data of plain meadow and the zoology orientation observational data of animal in the first meander of the Yellow River area,the climatic changes and its influence on the animal husbandry are analyzed.The results show that the annual change of precipitation has a descendant trend in most meadows around the first meander of the Yellow River and shows a 24 a,67 a and 1011 a periodicities.It is found that the annual change of average temperature behaves an ascendant trend and this ascending speed is higher than that of whole nation.The average temperature before 1983 is little lower;but it kept a continuate warm period after 1984.The annual aridity index shows a remarkable ascendant trend during the later 1980s to 2004,thereby the pasture output and quality lean to descending and the proportion of weeds and poisonous weeds lean to increase,productivity of grass fields shows descendant trend.Because of temperature rising and snowfall reducing in winter and spring,the annual death rate of livestock tends to decrease and the annual survive rate of young animals tends to increase.2|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To study the feasibility,reliability and importance of taxonomy character at superfamily level in insect math-morphological features by a combination approach of the rough-set theory and the neutral network we analyzed 11 math-morphological features(MMFs),such as area,perimeter,and so on,from the images of 23 species of insects,in five superfamilies of Lepidoptera and Coleoptera,Noctuoidea,Bombycoidea,Papilionoidea,Scarabaeoidea and chrysomeloidea.The results were compared with those of the statistical analysis reported by Zhao Hanqing.The rank of reliability MMFS in the identification of insect superfamilies is from high to low;the area and hot-holenumbe are grater than perimeter;the X-length,form parameter,circularity,roundness-likelihood,eccentricity greater then Y-length,lobation,sphericity.The results are not completely identical with those from Zhao Hanqing,but the most characteristics are identical.The results of pattern recognition by neutral network are completely identical with those of traditional classifications.This theory applied to insect taxonomy is better compared with the statistical analysis method and has a great significance at superfamily level when used with rough-set neutral network.0|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Spatial pattern and time-series dynamics of Didesmococcus koreanus Broch were analyzed by calculating five indices of aggregation,and parameters of Iwao model and Taylor's power law model from March to September.The results showed that the spatial pattern of D.koreanus in horizontal and upright dimension,at different directions,altitudes and population density in plum orchard was in an aggregated distribution pattern,and the fundamental component was the group composed of several individuals.The Aggregation intensity of D.koreanus was the highest in upper and southern part of the crown,and the lowest in its lower and northern part.The aggregation was due to the biological habits of D.koreanus and environmental heterogeneity.Whether D.koreanus was in the upper,middle,or lower crown of the plum tree,its aggregation intensity was higher before mid-ten days of April,and then gradually decreased after the last ten days of April because of preying by natural enemies,e.g.,Chilocorus rubidus Hop.Based on data for the spatial distribution,the model of the most suitable sampling intensity is established and the suitable sampling intensity at different densities of D.koreanus and error level is presented.The sequential sampling diagram was drawn to investigate the D.koreanus population levels in a plum orchard.3|7|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：A hundred and eighty Hi-Line Brown hens were exposed to red(660 nm,R),green(560 nm,G) and blue(480 nm,B) light from light emitting diode(LED) lamps and incandescent light(400-700 nm,W) for19 to 37 weeks to study the effect of monochromatic light during peak period as well as concentration of luteinizing hormone(LH) and follicle stimulating hormone(FSH) in peripheral blood and morphological structure of magnum during the peak period.The results showed that: 1) The peak period in W light was the shortest(23-29 wk) and that in B light was the longest(23-35 wk) among the four light groups;2) The duration of secretion of LH and FSH in blue light was the longest(25-34 wk) among the light groups;3) To compare with other light groups,the arrangement of tubular gland under blue light? was tight and glandular lumens were filled with secretions at 34 wk.Our results indicate,that the secretion of LH and FSH in the peak period was enhanced by blue light,which favoured the function of the oviduct and caused the extension of its peak period.Under the blue light,the laying rate in peak production was 94% and the feed-egg ratio in the peak period was the lowest(2.10) among the four light groups.Compared with the white light,the peak period in blue light was extended by 6 weeks,and its egg production was improved significantly.3|8|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：The hydrolysis and acidification profiles were studied in the digestion of food wastes and mixture waste using a novel two-stage anaerobic digester system.For digestion of mixture wastes and food waste,the VFA destruction rate was 73% and 90% in methanized reactor,respectively.The hydrolysis rate in the leachate from solid-beds was 62% and 58% at the first digestion day,and reached over 75% after fourth digestion day and keeps stable.Acidification rate were 5% and 20% at the first digestion day,and increased gradually to 42% and 32%,respectively.The results indicated that solid-beds provided easily-degradable substrates for methanized reactor,in while,methanized reactors promoted further hydrolysis and acidification in solid-beds through effluent recirculation.0|7|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：The developing history and trend of impact sprinklers were summarized and the latest popular structures and corresponding characteristics of impact sprinklers were introduced.The main problems existed in research and manufacture of impact sprinklers in China were analyzed.Some proposals,such as application of new technologies in computational fluid dynamics,computational structure dynamics and particle image velocimetry,strengthening academic cooperation and building up system of quality supervision,were suggested,which would promote the development of impact sprinklers in China.0|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Based on typical soil mechanical tests of a soil specimen,the Drucker-Prager criterion and related yield criterion for rocky/soil materials were adopted to carry out a numerical simulation for the simple compression test of the soil specimen using the Finite Element Method.A comparison between the results from the simulation and the tests was done and the results demonstrated a good coincidence of failure surface position and direction,which proved the soil elastoplastic model a valid approach.The method was proposed for relevant soil engineering computations,such as determining model parameters,and suitable model from soil tests,simulation of the same problem as the simple soil test to validate the selected model etc.Then a real simulation job can be conducted for a practical geotechnique problem.0|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：A method for analyzing the performance of steel-concrete composite beams with interface slip was developed in this paper. In the model an assumption was made that the total moment of a composite beam with interface slip was consisted of a global moment that was borne by a composite beam without interface slip and a local moment that was borne by a superposltion beam with freely interface slip only, Then, a formula for moment allocation of a beam was developed based on Bernoulli beam theory and shear-slip model of shear connector. The formulas of interface slip and shear force of shear connector, stress in the cross-section and the deflection of beam in elasticity state were given for simply-supported beams under uniform distribution loads.1|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：We used non-prarametric kernel density technique as a core in developing an evaluation system for determining the GRP rate of premium based on our analysis of maize production in Anguo city, Hebei province during 1980- 2004. The study shows that at 80% guarantee level, the pure rate of premium was 3.4% ; and at 70% guarantee level, the pure rate of premium was 2.9%. These results were almost the same as those evaluated by the conventional method, which proves the feasibility of using non-prarametric kernel density technique for risk evaluation, and provides a new practical way to determine crop GRP rate of premium. The result can serve as a guide to China agricultural insurance tests, and agricultural insurance subsidy policy.3|10|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
