检索规则说明:AND代表“并且”;OR代表“或者”;NOT代表“不包含”;(注意必须大写,运算符两边需空一格)
检 索 范 例 :范例一: (K=图书馆学 OR K=情报学) AND A=范并思 范例二:J=计算机应用与软件 AND (U=C++ OR U=Basic) NOT M=Visual
作 者:郭斌[1] 周学东[1] 肖晓蓉[1] 胡涛[1] 朱硃[1] 李蕾[1]
出 处:《华西口腔医学杂志》2001年第5期312-314,共3页West China Journal of Stomatology
基 金:国家自然科学基金资助项目 (编号 396 70 785 )
摘 要:目的 :探讨不同浓度的对氨基苯甲酸 (PABA)对变链菌生长的影响。方法 :将变形链球菌ATCC2 5 175 (血清c型 )在改良Carlsson培养基中厌氧培养 ,实验组在其中加入不同浓度 (10 _1 0 ~ 10 _3 g L)的PABA液厌氧培养 48h后采用紫外可见分光光度仪测定细菌浓度OD值 (λ=5 5 0nm) ,并在琼脂平板上培养观察细菌生长情况 ,进行菌落计数。结果 :菌液比浊及菌落计数结果均表明PABA确有促进变链菌生长的能力 ,当PABA的浓度从 10 _1 0 ~ 10 _4g L增大时 ,其促进变链菌生长的能力增强 ,但当PABA浓度增大到 10 _3 g L ,则促进变链菌生长的能力开始下降。当PABA浓度为 10 _9~ 10 _3 g L时 ,实验组的细菌生长明显高于对照组 (P <0 0 5 )。结论 :当PABA的浓度为 10 _4g L时 ,其促进变链菌生长的能力达最强 ,高于或低于此浓度 。Objective:The aim of this study is to examine effects of para_aminobenzoic acid (PABA) on the growth of Streptococcus mutans (S.mutans).Methods:Different concentrations of PABA (10\+\{_10\}~10\+\{_3\} g/L) were separately transferred to modified Carlsson medium. S. mutans (ATCC 25175) grew in modified Carlsson medium with different concentrations of PABA. All cultures were incubated at 37℃ anaerobically in an atmosphere of 80% of nitrogen (v/v), 10% of hydrogen (v/v) and 10% of carbon dioxide (v/v) for 48 hours. The absorbance values of S. mutans were measured by using a spectrometer (UV_1601). The colony forming units (CFU) were obtained by growing S. mutans in media with different concentrations of PABA (10\+\{_10\}~10\+\{_3\} g/L).Results:Different concentrations of PABA had different stimulating effects on the growth of S. mutans (P<0.05). But this kind of stimulating effects declined when the concentration of PABA was 10\+\{_3\}g/L.Conclusion:This experiment indicates PABA has stimulating effects on the growth of S. mutans, and PABA can promote growth of S. mutans.\;
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在链接到云南高校图书馆文献保障联盟下载...
云南高校图书馆联盟文献共享服务平台 版权所有©
您的IP:216.73.216.171