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1.
为观察致羔羊脑炎粪肠球菌XJ05株生物被膜（BF）的形成能力并检测致羔羊脑炎粪肠球菌BF形成相关基因的携带情况,本研究以XJ05为研究对象,运用96孔板建立不同时间BF模型,染色后酶标仪测定D595 nm值,并用倒置显微镜观察BF形态。同时检测11株菌中与BF形成相关基因（gelE、esp、ace、asa1、asa373、efaA、ef0591、ef3314、ahrc、eep）的携带情况,并对相关基因片段做同源性分析。结果显示,在不同时间段XJ05株BF的生成量与空白对照组相比差异显著（P<0.05）,24 h时D595 nm值最高且与其他各个时间段相比均差异显著（P<0.05）。显微镜下观察6 h时BF初具规模,可见散落的网状结构,12~24 h矩阵网格结构明显,24 h时形成高度有序的网格结构,24 h后网状结构逐渐脱落,BF开始降解。11株菌中10种相关基因的携带情况不同,有6株携带8种基因,1株携带7种基因,1株携带6种基因,1株携带2种基因,有2株未检测到10种基因的任何一种。检出的基因片段同源性均在93.3%~100.0%之间。结果表明,XJ05株能形成完整的BF,11株分离的致羔羊脑炎粪肠球菌中有9株携带部分与BF形成相关的基因。 相似文献
2.
为测定致羔羊脑炎粪肠球菌（Enterococcus faecalis）的生长曲线，寻求一种快速而准确的方法测定不同生长时期粪肠球菌数量，并客观评价其毒性强弱及其对小鼠脑组织的影响，试验采用平板菌落计数法和OD-Monitor振荡比浊法（Dλ值法）测定粪肠球菌的生长曲线，探究该菌在合适时间段内的吸光值（D600 nm）与平板菌落计数法测定的活菌数（CFU）的关系。用粪肠球菌感染小鼠，观察记录小鼠的死亡情况，最后采用Karber法计算粪肠球菌感染小鼠的半数致死量（LD50）。用LD50的剂量感染小鼠，及时采集死亡小鼠脑组织，未死亡的小鼠72 h后全部剖杀取脑组织，一部分做涂片染色，制作病理切片，观察病理变化；一部分进行培养，用于PCR方法进行细菌的回收鉴定。结果显示，用两种方法测定此株粪肠球菌的生长曲线基本一致，在2~8 h生长迅速，为对数生长期，8~14 h生长缓慢，为稳定期，14 h之后死亡数增加，进入衰亡期；对12 h粪肠球菌D600 nm与CFU的关系进行探讨，成功建立回归方程：y=20.769x-1.3422，R2=0.997；其感染小鼠的LD50为7.77×1011个活菌。以此剂量感染小鼠，脑组织涂片染色和培养染色，均能看到革兰氏阳性球菌；PCR结果显示，均出现了大小为112 bp的条带。对脑组织进行病理学观察发现该菌可导致脑组织充血、出血、形成微血栓，脑膜充血。通过生长曲线和其D600 nm与CFU关系的建立，可实时监测粪肠球菌数量，为后期更深入研究粪肠球菌穿越血脑屏障的机制奠定重要的理论基础。 相似文献
3.
为了查明导致新疆某规模化奶驴场乳房炎的主要病原菌及其生物学特性,试验采用常规微生物学方法对病原菌进行分离,采用生化鉴定管和16S rRNA的PCR扩增方法对病原菌进行鉴定,采用K-B药敏纸片法测定其耐药性,D600 nm值绘制细菌生长曲线,最后分析同源性并构建系统进化树。结果显示,分离株为革兰氏阴性短杆菌,能在麦康凯培养基上长出粉红色菌落,在伊红－美兰培养基上长出有金属光泽的菌落;生化鉴定分离株的葡磷胨水、赖氨酸、鸟氨酸、棉子糖、山梨醇、侧金盏花醇、木胶糖试验均呈阳性,而苯丙氨酸和硫化氢试验均为阴性;PCR扩增后测序得到205 bp的1号菌株和203 bp的2号菌株,其特性符合大肠杆菌的特性;药敏结果表明,分离株对链霉素和氯霉素高度敏感,对青霉素、阿莫西林和庆大霉素耐药;生长曲线表明,分离株在2~16 h时为高度繁殖期,16~32 h处于稳定期,32 h以后开始进入衰退期;1号菌株与2号菌株同源性高达99%,1号菌株与大肠杆菌11J和RCB800的同源性最高（100%）;2号菌株与大肠杆菌675SK2和DTU-1的同源性最高（100%）;由系统进化树分析可知,1号菌株与大肠杆菌11J和RCB800处于同一个小分支,2号菌株与大肠杆菌675SK2和DTU-1处于同一个小分支。因此,导致本次驴乳房炎的病原菌为大肠杆菌,本研究结果为进一步系统研究导致驴乳房炎大肠杆菌的致病机制提供参考。 相似文献
4.
利用猪繁殖与呼吸综合征病毒（porcine reproductive and respiratory syndrome virus,PRRSV）GP5抗原表位串联表达重组蛋白作为包被抗原,建立检测PPRSV抗体的间接ELISA方法。重组蛋白最佳包被浓度为7.5 μg/mL,最佳封闭液为5%脱脂奶粉,37 ℃封闭2 h;血清最适稀释度为1∶100,37 ℃作用2 h;兔抗猪IgG/辣根酶（HRP）（1∶3000）,37 ℃作用2 h;37 ℃避光显色15 min读取D450 nm值。结果经统计学分析得出,S/P值≥0.254为阳性,S/P值≤0.212为阴性。所建立的ELISA方法检测其他5种猪常见病原阳性血清,其D450 nm值均小于0.212。利用建立的ELISA方法对临床免疫勃林格殷格翰猪繁殖与呼吸综合征活疫苗4周后的猪血清70份进行检测,其D450 nm值均大于0.85,表明本研究建立的重组GP5表位蛋白间接ELISA方法可用于临床样品的监测。 相似文献
5.
5株禽新城疫病毒新疆分离株F基因序列测定与遗传进化分析 总被引：1，自引：1，他引：0
从新疆乌鲁木齐市郊区养禽场发病禽群中分离到4株鸡源新城疫病毒（Newcastle disease virus,NDV）和1株鸽源 NDV。经血凝HA试验鉴定,NDV分离株均具有血凝性,5个毒株的血凝特性均可被NDV阳性血清所抑制,而不能被禽流感病毒(H5亚型与H9亚型)阳性血清抑制。本试验通过RT-PCR扩增了5株NDV全长F基因并进行了序列测定。序列分析表明,5 株 NDV 的核苷酸序列分别为1662、1589、1676、1589和1662 bp,均含有1个开放阅读框,分別编码 553、528、553、520 和 553个氨基酸;根据基因裂解位点的氨基酸序列分析表明,鸡源XJ/10/08株属于强毒株, XJ/3/07株、XJ/7/07株、XJ/9/08株和XJ/11/08株属于弱毒株;同源性分析表明,5 个 NDV新疆分离株与 La Sota 疫苗株的核苷酸同源性在 83.7%～99.8% 之间,与 TaiWan95 株核苷酸同源性在 84.7%～93.3% 之间;遗传发育进化树分析表明, 分离到的4个弱毒株与LaSota、Clone30、B1、BEA-45在同一亚群,属基因Ⅱ型,强毒分离株与TaiWan95、广东株(GD-1-98)、江苏株(JS-5-1)在同一进化分支内,属基因Ⅶ型。 相似文献
6.
Schlegelová J Babák V Klímová E Lukásová J Navrátilová P Sustácková A Sedivá I Rysánek D 《Journal of veterinary medicine. B, Infectious diseases and veterinary public health》2002,49(5):216-225
The prevalence of strains of Staphylococcus aureus, coagulase-negative (CN) staphylococci, Listeria monocytogenes, Escherichia coli, Enterococcus faecalis, E. faecium and Bacillus cereus, was investigated in 111 bulk milk samples. Staphylococcus aureus was isolated from 38 samples, CN staphylococci from 63 samples, E. coli from 49 samples, E. faecalis or E. faecium from 107 samples, and L. monocytogenes from two samples. Bacillus cereus was not found in any of the samples and three samples were free of any of the selected species. Sensitivity to the anti-microbial drugs amikacin, ampicillin, ampicillin + sulbactam, cephalothin (CLT), cephotaxime, clindamycin, chloramphenicol (CMP), co-trimoxazole, erythromycin (ERY), gentamicin, neomycin, norfloxacin, oxacillin, penicillin, streptomycin (STR), tetracycline (TTC) and vancomycin was tested using the standard dilution technique. Minimum inhibitory concentration (MIC) characteristics (MIC50, MIC90, MIC range) were determined for each microbial species. Resistance against one or more anti-microbial drugs was found in 93% of S. aureus, 40% of CN staphylococci, 73% of E. coli, 88% of E.faecalis, 55% of E.faecium, and one L. monocytogenes strain. Most of the strains, particularly enterococci, were resistant to STR, TTC, and ERY (MIC50 4 microg/ml). A high percentage of staphylococci were resistant to beta-lactam antibiotics. High resistance to CLT was found in 11 strains of E. coli (MIC 256 microg/ml) and strains resistant to CMP (MIC90 16 microg/ml) were detected. The highest numbers of resistance phenotypes were found in E. coil (16) and CN staphylococci (12). Eighteen identical resistance phenotypes were demonstrated in indicator bacteria (E. coli, E. faecalis, E. faecium) and pathogens (S. aureus, CN staphylococci) isolated from the same bulk milk sample. The obtained resistance data were matched against the herd owners' information on therapeutic use of the drugs. This confrontation could not explain the findings of strains resistant to ERY or CMP. Our findings are evidence of selection of resistant strains among not only pathogenic agents, but also among indicator bacteria which can become significant carriers of transmissible resistance genes. 相似文献
7.
柱状黄杆菌双抗体夹心ELISA检测方法的建立 总被引：1，自引：1，他引：0
The aim of this study was to develop a rapid method for the detection of Flavobacterium columnaris based on a double antibody sandwich ELISA （DAS-ELISA）. Purified monoclonal antibody against Flavobacterium columnaris was used as the capture antibody, while polyclonal antibody was used as the detection antibody. The optimal conditions for the ELISA were as follows: monoclonal antibody with 0.08 μg per well was added to coat overnight at 4 ℃; the plate was blocked by 30 g/L bovin serum albumin for 90 min at 37 ℃; incubation concentration of polyclonal antibody was 0.11 μg per well; the incubation time for detection antigen, polyclonal antibody and enzyme labeled antibody was 1 h at 37 ℃ for each; the value of D492 nm was obtained after 15 min coloration. Judging with P/N≥2.1 and D492 nm≥0.776 as positive criteria. This method had no cross reaction with Edwardsiella tarda, E. coli, Aeromonas hydrophila, Vibrio anguillarum, Vibrio alginolyticus, Vibrio parahaemolyticus and Vibrio harveyi. Its minimum detectable limit was 1×103 CFU. Therefore, this study provided a specific and sensitive detection method for Flavobacterium columnaris for the first time. 相似文献
8.
4株鸭源肠球菌的鉴定和致病性 总被引：1，自引：2，他引：1
对临床分离的4株鸭源肠球菌郑1株、郑2株、郑3株、北京株和1株粪肠球菌参考菌株进行了系统鉴定,并用SDS-PAGE和Western-blot技术对各菌株细胞壁蛋白图谱进行比较分析。结果5个菌株的形态、染色、生理生化特性均与粪肠球菌特性一致;它们均对青霉素、万古霉素和庆大霉素敏感而对四环素耐药;5个菌株人工感染雏鸭及小白鼠均有致病性,但各菌株间致病力存在差异,北京株最强,参考株最弱,其余3株介于北京株和参考株之间;各菌株的细胞壁蛋白经SDS-PAGE在相对分子质量33 370~131 690之间均显示数十条蛋白带,其中郑2株和北京株在相对分子质量66 840处均有1条染色较深的蛋白带,而用Western-blot分析显示抗北京株胞壁蛋白抗体只能检测到北京株相对分子质量为66 840的抗原蛋白。以上结果表明,这5个被检菌株为致病性粪肠球菌,且致病性以北京株最强。 相似文献
9.
试验旨在研究快速、简单、高效提取芽孢杆菌与乳酸菌DNA的方法。在微波炉额定功率800 W下,对芽孢杆菌和乳酸菌进行微波处理40~150 s,离心获取上清,收获细菌DNA,将样本DNA PCR扩增后进行琼脂糖凝胶电泳验证,测定其纯度和产量后测序。结果显示,在微波炉功率800 W条件下加热40~150 s均可有效提取芽孢杆菌与乳酸菌DNA。所得DNA质量较好（D260 nm/D280 nm在1.8~2.1之间）。DNA浓度符合PCR检测要求,目的条带清晰,所得测序结果满足常规分子生物学研究。该微波提取方法具有简单、快速、高效的特点,且具有广泛的实用性,为乳酸菌与芽孢杆菌快速分子检测提供了简便手段。 相似文献
10.
In order to study the aerosol transmission of arthropathic and amyloidogenic Enterococcus faecalis strains, preliminary aerosol experiments were performed. The experiments were carried out in empty isolators to assess the yield and viability of E. faecalis and Newcastle disease vaccine virus (NDVV) aerosol particles with time. NDVV was aerosolized because this virus would be used in combination with E. faecalis in a subsequent study. Concentrations of about 10(5) colony-forming units (CFU) of E. faecalis/ml of air were still found 30 min after the aerosol application. At 45 min, however, E. faecalis concentrations dropped below the detection level. The average E. faecalis concentration during the aerosol experiment was estimated at 10(5) CFU/liter. The NDVV aerosol generated an average of 10(4)-10(5) 50% embryo infective dose per liter of air. In these experiments, E. faecalis and NDVV aerosols were successfully generated despite considerable initial particle loss. The bacteria and virus uptakes per chick are discussed in case day-old chicks would be exposed to these aerosols. 相似文献
11.
为了提高水蛭素的生产效率以适应生物医药应用的需求，试验通过对水蛭素基因进行密码子优化，构建了重组水蛭素原核表达系统，并对D600 nm值、诱导时间、诱导剂IPTG浓度和诱导温度4种诱导条件进行了探索，同时通过引入试验设计（design of experiment，DOE）方案将4种因素对诱导效率的影响进行进一步系统的优化，使用His-Trap亲和层析对重组蛋白进行纯化，并通过凝血酶滴定法对重组水蛭素的活性进行测定。结果显示，试验成功构建重组水蛭素原核表达载体，水蛭素蛋白为可溶性表达。单因素变量优化后的诱导条件为：在菌体密度D600 nm值为0.4时，加入1 mmol/L IPTG，37℃下诱导7 h，重组水蛭素蛋白表达效率最高，占菌体总蛋白66.5%；而DOE试验优化结果为：在菌体密度D600 nm值为0.6时，加入0.82 mmol/L IPTG，31.9℃下诱导7.6 h，预测重组水蛭素蛋白表达效率最高，占菌体总蛋白72.7%，显著高于单因子变量法优化结果（P<0.05）。进一步分析发现，各影响因素之间存在明显的交互效应，影响了单因素试验结果的准确性。通过亲和层析纯化后的重组水蛭素纯度可达99%，抗凝活性为114 ATU/mg。研究成功构建了重组水蛭素原核表达载体，对其表达条件进行了优化，并获得了重组水蛭素蛋白，为水蛭素应用于生物医药奠定了基础。 相似文献
12.
The assay was aimed to investigate a fast,simple and efficient method with microwave heating for extracting DNA of Bacillus and Lactobacillus.Treated in a microwave oven at rated power (800 W) for a certain time (40 to 150 s),then centrifuged for supernatant.The supernatant was transferred to a sterile tube for PCR testing and agarose gel electrophoresis.Sequencing was carried out after determining the purity and yield.The results showed that heating for 40 to 150 s at 800 W microwave power conditions could effectively extract DNA of Bacillus and Lactobacillus.The obtained DNA quality was good (D260 nm/D280 nm was 1.8 to 2.1).The DNA concentration in line with the PCR testing requirements;Sequencing results was satisfied with the routine molecular biological research.The microwave extraction method had simple,fast and efficient features,and a wide range of practical,which provided a simple means for rapid molecular assay. 相似文献
13.
【目的】制备鸭疫里默氏杆菌(Riemerella anatipestifer,RA)贵州流行株蜂胶灭活疫苗。【方法】选取RA血清2型贵州流行株(RA-SS-8株)为基础菌株,依次利用分光光度法和平板计数法测定细菌生长曲线,再进行灭活条件筛选,以蜂胶为佐剂制备RA贵州流行株蜂胶灭活疫苗,并进行无菌检验、安全性检验及免疫鸭攻毒保护性试验。【结果】分光光度法测定RA-SS-8株菌液D600 nm值随培养时间变化显示,细菌在0~3 h时增殖缓慢,在3~10 h时增殖趋势明显加快,在10 h以后增殖逐渐趋于平缓,随着培养时间的延长,细菌最终进入衰亡期;平板计数法结果显示,RA-SS-8株D600 nm值为0.1~0.8时,该菌处于对数生长期,且D600 nm值与活菌数呈现良好的线性关系;RA-SS-8株最佳灭活条件为0.2%甲醛溶液、37 ℃灭活12 h;蜂胶灭活疫苗含菌量为3.8×109 CFU/mL,蜂胶干物质含量为10 mg/mL;无菌检验巧克力琼脂培养基上未见菌落生长;安全性检验以2倍免疫剂量接种雏鸭在观察期内未表现出不良反应,大体病变观察未见明显病变;免疫鸭攻毒保护性试验显示,蜂胶灭活疫苗免疫组鸭对RA-SS-8株的攻击后保护率为70%,蜂胶灭活疫苗对试验鸭心脏、肝脏组织均具有良好的保护效果。【结论】本研究成功制备了RA贵州流行株蜂胶灭活疫苗,为蜂胶灭活疫苗制备和动物免疫试验奠定基础。 相似文献
14.
为了解新疆马疱疹病毒1型（EHV-1）主要毒力基因遗传进化情况并构建TK基因缺失株，本研究以EHV-1 XJ2015株DNA为模板，对其主要毒力基因TK、gI和gE全长进行克隆、测序及生物信息学分析，并扩增TK基因左右重组臂TKL和TKR，构建质粒pUC-TKLR，将扩增后的增强绿色荧光蛋白（EGFP，含有CMV+polyA）插入pUC-TKLR质粒，构建TK基因缺失打靶质粒。TK、gI和gE基因同源性分析结果显示，XJ2015株与国外EHV-1分离株TK、gI和gE基因同源性均较高，分别为99.8%~100.0%、99.6%~100.0%和99.9%~100.0%；与EHV-3分离株同源性均最低，分别为72.9%、59.4%和62.1%；遗传进化分析显示，3个基因均与国外EHV-1同属于一个遗传进化分支，与EHV-9和EHV-4进化关系较近，但与EHV-3进化关系较远，表明XJ2015毒株与国外EHV-1毒株TK、gI、gE基因核苷酸上差异不明显，没有明显的地域性特征，功能基因保守且进化缓慢，同源基因功能相同或相近；经PCR扩增、酶切、测序及转染鉴定，本试验成功构建了用于TK基因缺失的打靶质粒pUC-TKLR-EGFP。通过对EHV-1主要毒力基因的分析及TK基因缺失打靶载体的构建，为新疆地区马鼻肺炎流行病学调查分析、TK基因缺失株的构建提供理论依据。 相似文献
15.
选取质粒pLEM415-egfp电转化源于陕北白绒山羊瘤胃的乳酸杆菌,研究不同生长时期及电场强度对6株羊源乳酸杆菌电转化效率的影响,并优化其转化条件。在37 ℃培养条件下,培养6株羊源乳酸杆菌,当D600 nm 达到0.4、0.6、0.8、1.0和1.2时,离心收集菌体,制备感受态细胞;在电阻200 Ω、电容25 uF条件下,分别采用1.5、2.0和2.5 kV 3种电场强度电击转化感受态细胞。结果表明,羊源植物乳酸杆菌(Lactobacillus plantarum)、干酪乳酸杆菌(Lactobacillus casei)、罗伊乳酸杆菌(Lactobacillus reuteri)、短乳杆菌(Lactobacillus brevis)、棒状乳酸杆菌(Lactobacillus coryniformis)和弯曲乳酸杆菌(Lactobacillus curvatus)获得最高转化效率的D600 nm和电场强度分别为0.8、1.2、1.0、0.6、0.8、0.4和1.5、1.5、1.5、1.5、1.5、2.0 kV。羊源乳酸杆菌最佳转化条件的确立,为后续乳酸杆菌转基因工程菌的构建及其应用奠定了基础。 相似文献
16.
为探究不同环境因子及接种量对单增李斯特菌（LM90）生长特性的影响,本试验通过测定LM90在各培养条件下的D600nm值,分析了不同的温度、NaCl浓度、pH,以及温度（0~40℃,梯度为10℃）、NaCl浓度（3%~8%,梯度为1%）、pH （6~9,梯度为1）的交互作用下LM90的生长状况。结果显示,菌株的对数增长期为8~16 h,稳定期为16~20 h,20 h以后进入衰亡期;菌株在NaCl浓度为0.5%~4%时生长良好,其最适生长pH为7.5,最适生长温度为37℃。通过SPSS 20.0软件进行方差分析可知,各因素的交互作用均对LM90有极显著影响（P＜0.01）。本研究为进一步探讨温度、NaCl浓度、pH等因素对LM生长的影响及LM抗环境胁迫的作用机制奠定了基础。 相似文献
17.
The implication of biofilm in chronic bacterial infection in many species has triggered an increasing interest in the characterization of genes involved in biofilm formation. The bap gene is a newly identified gene that encodes the biofilm-associated protein, BAP, which is involved in biofilm formation in Staphylococcus aureus. So far the bap gene has only been found in a small proportion of S. aureus strains from bovine mastitis in Spain. In order to study the presence of the bap gene in S. aureus isolates obtained from other species and various locations, a collection of 262 isolates was tested by PCR, using published primers and dot-blot. The results indicated that none of the isolates carried the bap gene suggesting that the prevalence of this gene among S. aureus isolates should be very low. 相似文献
18.
为确定导致通辽某鹅场雏鹅败血症的病原,本研究将从病鹅心、肝、淋巴结和脑组织液中分离的革兰氏阳性球菌纯化培养,进行形态学和生长耐受性观察,菌属区别、分群和菌种鉴定试验,16S rDNA检测、系统进化分析和致病性试验。结果表明,分离菌株(HQ831431)为中等致病力粪肠球菌,具有β型溶血特性,可致小鼠急性败血症。分离菌株与参考菌株ATCC29212及国内外分离的其他15株粪肠球菌16S rDNA的同源性均在99.0%以上,位于系统发育树的同一分支。 相似文献
19.
In order to explore the growth characteristics of the Listeria monocytogenes (LM90) strain under different environmental factors and inoculum size,the D600nm value of bacteria culture broth were measured,the growth status of LM90 under different NaCl concentration,pH value,temperature and the interactions of NaCl concentration (3% to 8%,1% for per gradient),pH (6 to 9,one for per gradient),temperature (0 to 40℃,10℃ for per gradient) had been analyzed. The results showed that the strain was in the logarithmic phase when culturing for 8 to 16 h,then entered the stationary phase when culturing for 16 to 20 h,and finally went to decline phase when culturing after 20 h. It could grow well when the NaCl concentration was 0.5% to 4%. Its optimum growth pH and temperature were 7.5 and 37℃,respectively. The interaction effect of each two factor had been analyzed by variance analysis of SPSS software,and it found that the interaction effects was extremely significantly (P <0.01).The study lay a foundation for exploring the effects of environmental factors on LM90 growth and mechanisms of resistance to environmental stresses. 相似文献
20.
为研究不同浓度的赤霉酸对饲料添加菌生长的影响,用2种不同浓度的赤霉酸溶液单独添加饲料乳酸菌（A4+A7）和纤维素分解菌（Nf+Y6）进行培养52 h,其中每4 h作一个单位测定出OD600 nm值并绘制生长曲线,分析不同浓度的赤霉酸对饲料添加菌生长的影响。结果表明,赤霉酸浓度为10 mg/L时,各组OD600 nm值分别为0.64、0.70、0.84、0.78、0.72,其中试验组2的OD600 nm值与对照组和其他试验组相比有明显增高,总活菌数高达11.6×108 CFU/mL,比对照组（1.63×108 CFU/mL）高7倍以上;当赤霉酸浓度增加到20 mg/L时,各组OD600 nm值分别为0.64、0.60、0.59、0.59、0.63,其中各试验组的OD600 nm值与对照组相比无明显差异（P>0.05）,试验组活菌数（1.60×108 CFU/mL）与对照组相比（1.63×108 CFU/mL）无明显差异（P>0.05）。通过试验数据和生长曲线得知赤霉酸浓度在10 mg/L时能促进乳酸菌和纤维素分解菌的生长繁殖;赤霉酸浓度为20 mg/L时乳酸菌和纤维素分解菌的生长速度明显下降。综上提示,适当添加赤霉酸对饲料添加菌生长有明显的促进作用,赤霉酸浓度过高则饲料添加菌的生长量降低。 相似文献