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23Â¥2009-01-07 21:45:23
24Â¥2009-01-07 21:50:35
25Â¥2009-01-07 21:51:05
26Â¥2009-01-07 21:56:34
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27Â¥2009-01-07 21:57:44
30170687 30270969 30771524
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First, PCR amplification for 16S rDNA of standard bacterial strains (Escherichia coli, Lactobacillus, Bifidobacterium, Salmonell), and 1.2% Agarose gel electrophoresis of 16S rDNA amplified productions were conducted to establish a biological method for detecting and quantifying Escherichia coli, Lactobacillus, Bifidobacterium, Salmonella and bacteria in pure cultures, in vitro and in vivo samples by Alphalmager TM2200 Electrophoresis Gel Figure Image Quantity Analyse System. The Q-PCR method developed had a detection limit per reaction: 102-103 cells for Escherichia coli, 103-104 cells for Lactobacillus, 104-105 cells for Bifidobacterium, 103-104 cells for Salmonella and 102-103 cells for bacteria, which accuracy of the Q-PCR method was acceptable, but need improving. In vitro experiment was conducted to allot 6 treatments of 0, 1, 2, 4, 6 and 8g/L inulin each with 6 replicates for anaerobe incubation 24h at 37¡æ and measure pH, NH3, volatile fatty acids and the populations of Escherichia coli, Lactobacillus, Bifidobacterium, Salmonella and bacteria in the culture medium. The results showed that, as inulin level rose from 4g/L to 8g/L in the culture medium, the populations of Bifidobacterium, Lactobacillus and bacteria, and propionic acid content increased (P<0.05). However, the populations of Escherichia coli and pH, NH3 decreased (P<0.05). In piglet experiment, 90 28-day-old weaned piglets were conducted to 5 diets of 0, 0.5, 1.0, 1.5% inulin ¡À antibiotics for 28 days and blood, intestinal fluid and feces samples were collected to measure pH, bacterial communities, volatile fatty acids and digestive enzyme activities. The results showed that the supplement of 1.0 % inulin could increase the populations of Lactobacillus in cecum and of Bifidobacterium in ileum, cecum and rectum, and propionic acid content in cecum (P<0.05), and decrease pH in cecum, colon and rectum and plasma glucose content (P<0.05). In broiler experiment overfulfilled, 120 21-day-old Arbor Acre broilers were randomly allocated into 4 treatments with 6 replicates / treatment and fed diets each supplemented with 0, 0.2, 0.4 and 0.8% inulin for 28 days. The performance, bacterial communities, digestive enzymes and blood biochemical indexes were measured. The results showed that the populations of Bifidobacterium in ileum rose and pH in plasma, cecum, colon and feces and plasma glucose fell as inulin supplemented (P<0.05). Three experiments identically approved prebiotic action that was to promote the multiplication of Bifidobacterium and restrain the proliferation of Escherichia coli, which changed microbial metabolites compounds and specially increased propionic acid content (P<0.05), dropped pH in plasma and large intestine and blood glucose (P<0.05). It was concluded that inulin could have significant effects on the activities of digestive enzymes such as amylase, trypsin, lipase in pancreas and small intestine and inulinase and cellulase in cecum for the first time.These results can provide good basis for further research of inulin as feed addtive. ½áÌâÖÐÎÄÖ÷Ìâ´Ê 16S rDNAÀ©Ôö·¨£»³¦µÀ΢ÉúÎïÇøÏµ£»¾Õ·Û£»¶ÏÄÌ×ÐÖí£»Èâ×м¦ ½áÌâÓ¢ÎÄÖ÷Ìâ´Ê PCR method for 16S rDNA; Intestinal bacterial communities; Inulin; Weaned piglet; Broiler ¸ºÔðÈË »ô¹ó³É ÏîÄ¿Åú×¼ºÅ 30270969 ѧ¿Æ´úÂë C120104 ÏîÄ¿Ãû³Æ ÒæÉú¾ú¶¨Ö²¼°ÆäÔöÇ¿ÃâÒß»úÀíµÄÑо¿ ÉêÇëÊéÕªÒª ÉêÇëÊéÖ÷Ìâ´Ê ÒæÉú¾ú ¶¨Ö² ·ÇÌØÒìÐÔÃâÒß ½áÌâÖÐÎÄÕªÒª ÏîÄ¿ÒÔÒæÉú¾úÖÐ×îÎªÖØÒªµÄÇഺ˫Æç¸Ë¾ú¡¢Ó¤¶ùË«Æç¸Ë¾ú¡¢³¤Ë«Æç¸Ë¾ú¡¢¶ÌË«Æç¸Ë¾úºÍÊÈËáÈé¸Ë¾úΪÑо¿¶ÔÏó£¬Í¨¹ýÒæÉú¾ú¶Ô²¡Ô¾úµÄ·ÀÓù¹¦ÄÜ¡¢¶Ô¿¹Ïû»¯µÀÄæ»·¾³ÌØÐÔ¡¢×ÐÖíС³¦Õ³ÒºÌǵ°°×ºÍÄ£ÄâÈ˳¦µÀճĤÉÏÆ¤Ï¸°ûµÄÕ³¸½¶¨Ö²»úÀí¼°ÆäÃâÒß¹¦ÄܵÄÑо¿±íÃ÷£¬Ó¤¶ùË«Æç¸Ë¾úºÍ³¤Ë«Æç¸Ë¾ú¾ßÓÐÁ¼ºÃµÄ¿¹ÄæÐÔÌõ¼þÐÔ×´£» ËùÉ¸Ñ¡ÒæÉú¾ú¶Ô²¡Ô¾úÓÐÒ»¶¨µÄÞ׿¹×÷Óã»Í¬Ê±Õ³¸½ÊÔÑé֤ʵ²»Í¬¾úÖêË«Æç¸Ë¾úËù·ÖÃÚµÄÕ³¸½ËؾßÓоúÖê²îÒìÐÔ£¬½éµ¼Ë«Æç¸Ë¾úÕ³¸½¹ý³Ì¿ÉÄÜÊDz»Ö»Ò»ÖÖ»úÖÆÔÚÆð×÷Óã¬Çഺ˫Æç¸Ë¾úµÄÕ³¸½ËØÎª¾úÌå·ÖÃÚµ½ÅàÑø»ùÖеÄÒ»ÖÖµ°°×ÖÊ£¬ÊÜÌåΪϸ°û±íÃæµÄÒ»ÖÖÌǵ°°×£»ÊÈËáÈé¸Ë¾úµÄÕ³¸½ËØÊǾúÌåϸ°û±ÚÉϵÄÒ»ÖÖµ°°×ÖÊ£¬ÆäÔÚ³¦µÀÉÏÆ¤Ï¸°ûÉϵÄÕ³¸½ÊÜÌåΪµ°°×£»¾ÈÈ´¦Àíʧ»îºóµÄÇഺ˫Æç¸Ë¾úÈÔ¾ßÓÐÕ³¸½ÄÜÁ¦£¬¶øÊÈËáÈé¸Ë¾ú»ù±¾É¥Ê§Õ³¸½ÄÜÁ¦£»Ó¤¶ùË«Æç¸Ë¾úºÍ³¤Ë«Æç¸Ë¾úÔöÇ¿Õý³£BALB/CС°×ÊóµÄ·ÇÌØÒìÐÔÃâÒß¹¦ÄÜ£¬²¢¾ßÓÐÁ¼ºÃµ÷½Ú³¦µÀ¾úȺÄÜÁ¦£¬Ó¤¶ùË«Æç¸Ë¾úЧ¹ûÓÅÓÚ³¤Ë«Æç¸Ë¾ú£»Çഺ˫Æç¸Ë¾úÓëÊÈËáÈé¸Ë¾ú¾úϸ°û±ÚëľÛÌǶÔÀ¥Ã÷СÊóÃâÒß¹¦ÄܾßÓдٽø×÷Óᣠ½áÌâÓ¢ÎÄÕªÒª The Bifidobacteria adolescent , Bifidobacteria baby, Bifidobacteria tall, Bifidobacteria short and Lactobacillus acidophilus were tested to study defensible function of pathogen, intestine tolerance,the mechanism of adhesion and immunologic enhancement. The results were showed that adhered substances which different Bifidobacteria bacteria excreted had bacterial significance. And there was not only a mechanism. The adhesin of Bifidobacteria adolescent was confirmed to be a certain kind of protein produced and excreted to the media by bacteria, and the receptor on intestinal epithelia should be some kind of glycoprotein. While the adhesin of Lactobacillus. acidopholus is protein on the surface of bacteria cell wall and the receptor is protein. The inactived Bifidobacteria. adolescent still can adhere to the intestinal epithelia while Lactobacillus. acidophilus cann't. The result approved that the adhesin of them were different from each other.In animal experiment , Bifidobacteria baby and Bifidobacteria tall had specific modulation on immune function of normal BALB/C rats.And there was good modulation of intestinal microflora.In comparison of Bifidobacteria tall , Bifidobacteria baby had the advantage .Mice were injected with bacteria suspension or Peptidoglycan and examed the influence on immunity. The result showed that Peptidoglycan could increase the immunity of animals tested. ½áÌâÖÐÎÄÖ÷Ìâ´Ê ÒæÉú¾ú£»¶¨Ö²£»·ÇÌØÒìÐÔ£»Õ³¸½ ½áÌâÓ¢ÎÄÖ÷Ìâ´Ê probiotics, colonization, natural immunity,?adhension ¸ºÔðÈË ³ÂÇìÉ ÏîÄ¿Åú×¼ºÅ 30771524 ѧ¿Æ´úÂë C120204 ÏîÄ¿Ãû³Æ ÀÒµ°°×ÌǾÞëÄ(CGMP)¶ÔСÊó³¦Õ³Ä¤ÃâÒßµ÷½Ú×÷ÓõÄÑо¿ ÉêÇëÊéÕªÒª ¸ù¾ÝÎÒÃÇÔÚÀÒµ°°×ÌǾÞëÄ(CGMP)µÄ·ÖÀë´¿»¯¼¼Êõ¼°¶Ô¸ÃÎïÖÊÉúÎï»îÐԵȷ½ÃæµÄǰÆÚÑо¿£¬±¾Ñо¿ÀûÓÃÓ«¹âÔλÔÓ½»¼¼Êõ¡¢ÃâÒß×黯¼¼Êõ¡¢·ÅÉäÃâÒß·ÖÎö¡¢ÏÔ΢¹Û²ìÒÔ¼°Í¼Ïñ·ÖÎöµÈ·½·¨£¬¶ÔËÇι²»Í¬¼ÁÁ¿µÄBALB/cСÊ󳦵ÀÄÚ¸÷Àà΢ÉúÎïÇøÏµ(microflora)·Ö²¼¼°Ïû³¤¹æÂÉ¡¢¸¹Ä¤¾ÞÊÉϸ°û(peritoneal macrophages)µÄÍÌÊÉ»îÐÔ¡¢³¦Õ³Ä¤ÖÐS-IgAº¬Á¿µÄ±ä»¯¡¢CD4+/CD8+Tϸ°û±ÈÂÊÒÔ¼°Ïà¹ØÏ¸°ûÒò×ӵı仯½øÐÐϵͳµÄÑо¿£¬È·¶¨ºÍ֤ʵCGMP¶ÔBALB/cСÊó³¦Õ³Ä¤ÄÚ¸÷Àà΢ÉúÎïÇøÏµµÄ±ä»¯ºÍ³¦Õ³Ä¤ÃâÒßϵͳµÄµ÷¿Ø×÷Ó㻽ÒʾÈéÔ´CGMPÈçºÎµ÷¿Ø³¦Õ³Ä¤µÄÃâÒßÓ¦´ð¹ý³Ì¼°Æä»úÖÆ¡£¶ÔÆÀ¼ÛÈéÔ´ÉúÎï»îÐÔëĵŦÄÜÒÔ¼°ÈËÓ붯ÎïµÄÓªÑø½¡¿µ¾ßÓÐÖØÒªÖ¸µ¼ÒâÒ壬Ҳ½«ÎªÓÃÈéÔ´ÉúÎï»îÐÔëĵ÷Àí¡¢Ô¤·ÀºÍÖÎÁƳ¦µÀ¼²²¡ÒÔ¼°¶ÔÈ鯷×ÊÔ´µÄÀûÓÃÓëÉî¼Ó¹¤µì¶¨ÀíÂÛ»ù´¡¡£ ÉêÇëÊéÖ÷Ìâ´Ê CGMP£¬³¦Õ³Ä¤ÃâÒߣ¬S-IgA£¬Ï¸°ûÒò×Ó£¬Î¢ÉúÎïÇøÏµ |
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