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- Keywords：mouse,oocyte maturation,nitric oxide,ovulation1|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Keywords：Tianjin White gilt,reproductive hormone,sexual development,puberty,3|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Crude extract samples were prepared from the germinatiing conidia of a heterokaryon of the wild type strain of Fusarium oxysporum f.sp. vasinfectum and its three nuclear type segregants. The crude extracts were analyzed by using PAGE for the following seven isozymes. The result indicated that there were no difference in the patterns of esterase and lactate dehydrogenase of these four samples, but the expression level of malate dehydrogenase and glucose 6 phosphate dehydrogenase of the non pathogenicity segregant was higher than the segregants with high pathogenicity. Alcohol dehydrogenase was not found in the two segregants with high pathogenicity toward cotton seedlings. Malic enzyme and catalase were undetectable in all of the four samples.Keywords：Fusarium oxysporum f.sp. vasinfectum,heterokaryon,isozyme7|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Several normal single hybrids and their corresponding isogenic C type cytoplasmic male sterile (CMS C) counterparts were used as females, pollinated by mixing marker of pollens to study C type cytoplasmic effect on single hybrid and heterosis of the two single hybrid crossed seeds in Maize. The results of comparing sister crossed kernel between CMS C hybrids and their counterparts, and comparing cross fertilized kernel with marker male parents, suggested that the C type cytoplasmic effect on kernel weight was different. The CMS C effect on kernel weight was 3.37% when comparing sister crossed kernel, and was 2.44% when comparing cross fertilized kernel with marker male parents. The average CMS C genetic effect was 2.88% and 2.94% respectively in two years. The same CMS C genetic effect varied with different hybrids and years. It was found that there was heterosis of cross fertilized kernel weight when the CMS C hybrids and their counterparts crossed with the same single hybrid, and the heterosis varied with different marker male parent. The cross fertilized kernel weight was 3.73% and 2.84% higher than that of normal hybrids selfed and CMS C hybrid sister crossed with their counterparts respectively.Keywords：maize,C type cytoplasmic effect,hybrid,mixing pollen,heterosis of the F 1 embryo stage16|12|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Keywords：winter wheat,sprinkle irrigation,border irrigation, water use3|8|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Keywords：winter wheat field,seeping irrigation,water saving,yield increasing,economic benefit2|7|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Salt content, organic matter content, heavy metals and ground water resource were selected as farmland quality indicators for evaluating sustainable land management in saline soil area of the North China Plain. The results suggested that in the area of saline soil, the salt content of soils were decreased after 19 year's reclamation, the productivity has been raised, agricultural production has been kept stable due to the construction of irrigating and draining system. Generally speaking, the land management is sustainable. But the shortage of fresh water resource will be the most chalenging factor for sustainable development.Keywords：saline area,farmland quality indicators,sustainable land management evaluation2|8|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：This paper presents the general evaluation system of SARD.The aim, content, criteria, method and process of the general evaluation system were discussed. A case study was carried out for Quzhou County of Hebei Province by the period of 1996-1998.The result shows that the development region of Quzhou County is sustainable.Keywords：SARD,general evaluation system,indicator,sustainable development4|13|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In this paper, the principle of using Bowen ratio system to measure ammonia volatilization from large area field, the details of installation of Bowen ratio system, and the credibility degree of the method were discussed. The 5 measurements showed that the systematic error of this method is less than 10%. This indicated that the Bowen ratio system can be used for measuring ammonia volatilization under field scale. Using this method, we found that the ammonia volatilization (N), under the typical productive conditions in North China Plain, ranged from 18.9 to 63.5kg N per hectare, 9.9%~37.0% of applied N.Keywords：ammonia volatilization,Bowen ratio system1|7|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Keywords：urea,cinnamon soil,inorganic N,NO 3 N leaching2|9|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Digital image technology had been extensively applied in many research fields. However, its application in entomology is just on the way. Generally, a digital image may consist of several different objects, and the research interest for an insect image focused on the insect region in the image. In order to extract the image features for further recognition research, it is necessary to segment the insect region from the origin image. Six algorithms, which are mean greylevel thresholding, P tile method, iteration thresholding, Kapur's and Johannsen's thresholding based on optimal entropy and Yager's thresholding based on minimal fuzziness, respectively, were applied to the segmentation of Helicoverpa armigera image. Results showed that both mean greylevel thresholding and iteration thresholding method can get a satisfactory segmentation of H.armigera image. However, the later one is much more suitable to the practical analysis. The segmentation result image of H.armigera from Johannsen's method included too many background pixels, made it very difficult to extract the striple features of H.armigera. The segmentation results using Kapur's and Yager's method are unacceptable, for they can not completely show needed insect image features. This study had provided some important background materials for further researches of feature extraction and automated insect image recognition.Keywords：digital image,insect image,image segmentation algorithm0|7|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：The fused product merged two optical image data of different resolutions--a high spatial resolution panchromatic image (IRS 1C) and a low spatial resolution but multispectral image (TM). Its signal clarity was improved. Artificial neural network technology is of great advantage to deal with data of uncertain distributing and qualitative data such as performing non linear classification, and thus being used to classify the land cover. The classification accuracy of fused remote sensing image reached a accuracy of up to 95%. It is far much better than the method of maximum likelihood classification, whose total accuracy is only 71%.Keywords：artificial neural network,fused remote sensing image,classification1|8|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：A study was conducted to determine the number of lactic acid Producing bacteria, Bifidobacteria and Escherichia coli in the gastrointestinal contents and associated with mucus layers of various segments (gastric, small intestine, cecum, colon and rectum) of growing pigs. Results showed that there were significant bacterial populations presenting in gastrointestinal contents and mucus layers along the whole gastrointestinal tract. Furthermore, the population of lactic acid Producing bacteria presented both in gastrointestinal contents and associated with mucus layers was significantly higher than that of Bifidobacteria or E. coli ( P <0.01). The distribution of the three groups in the contents of the whole tract was: the number of Lactic acid Producing bacteria in the hindgut contents was significantly higher than that of gastric or small intestine ( P <0.01); the populations of Bifidobacteria in the cecum contents was the greatest ( P <0.01); the concentration of E. coli in the contents of cecum and colon was higher than that of other segments ( P <0 01). The distribution of the three groups associated with the gastrointestinal mucus layers was: the populations of Lactic acid producing bacteria in colon, Bifidobacteria or E. coli in cecum and colon were significantly greater than that of other segments of gastrointestinal tract ( P <0.05). There was no significant difference of the populations between Bifidobacteria and E. coli in the gastrointestinal contents except in the rectum. The numbers of Bifidobacteria associated with the colon and rectum mucus layers were significantly higher than that of E. coli ( P <0.05).Keywords：normal gastrointestinal bacteria,lactic acid producing bacteria,Bifidobacteria,Escherichia coli,growing pig0|10|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Keywords：vitamin D_3,weanling pigs,immunity function1|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Keywords：wheat bran,sugar beet pulp,piglets,nutrients,digestibility,metabolizability3|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Keywords：piglet,growth performance,SBM (soybean meal),synthetic amino acids1|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Keywords：egg production,two stage selection,genetic gain,optimization2|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Keywords：broiler,compensatory growth,protein level,early growth stage2|6|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
