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J. E. ROMBOUTS 《Journal of applied microbiology》1952,15(1):103-111
SUMMARY: A numerical analysis is given of the average microflora of fermenting cocoa beans in Trinidad sweat boxes. Both the viable count of all micro-organisms and the relative numbers of the main groups involved were estimated.
The influence of the prevailing temperature and pH of the environment on the sequence of microbial development is considered, and the main chemical changes taking place are noted.
The influence of atmospheric conditions is discussed and the desirability of a thorough microbiological analysis of the fermentation process in relation to cocoa quality is stressed. 相似文献
The influence of the prevailing temperature and pH of the environment on the sequence of microbial development is considered, and the main chemical changes taking place are noted.
The influence of atmospheric conditions is discussed and the desirability of a thorough microbiological analysis of the fermentation process in relation to cocoa quality is stressed. 相似文献
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OBSERVATIONS ON THE FINE STRUCTURE OF THE DEVELOPING SPERMATID IN THE DOMESTIC CHICKEN 总被引:8,自引:7,他引:1 下载免费PDF全文
Toshio Nagano 《The Journal of cell biology》1962,14(2):193-205
The kinetic apparatus, the acrosome and associated structures, and the manchette of the spermatid of the domestic chicken have been studied with the electron microscope. The basic structural features of the two centrioles do not change during spermiogenesis, but there is a change in orientation and length. The proximal centriole is situated in a groove at the edge of the nucleus and oriented normal to the long axis of the nucleus and at right angles to the elongate distal centriole. The tail filaments appear to originate from the distal centriole. The plasma membrane is invaginated along the tail filaments. A dense structure which appears at the deep reflection of the plasma membrane is identified as the ring. The fine structure of the ring has no resemblance to that of a centriole and there is no evidence that it is derived from or related to the centrioles. The tail of the spermatid contains nine peripheral pairs and one central pair of tubular filaments. The two members of each pair of peripheral filaments differ in density and in shape: one is dense and circular, and the other is light and semilunar in cross-section. The dense filaments have processes. A manchette consisting of fine tubules appears in the cytoplasm of the older spermatid along the nucleus, neck region, and proximal segment of the tail. The acrosome is spherical in young spermatids and becomes crescentic and, finally, U-shaped as spermiogenesis proceeds. A dense granule is observed in the cytoplasm between acrosome and nucleus. This granule later becomes a dense rod which is interpreted as the perforatorium. 相似文献
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EFFECT OF CHLORAMPHENICOL ON THE SURVIVAL OF ESCHERICHIA COLI IRRADIATED WITH ULTRAVIOLET LIGHT 总被引:2,自引:2,他引:0 下载免费PDF全文
Hiromu Okagaki 《Journal of bacteriology》1960,79(2):277-291
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γ射线与咖啡因复合处理对大麦的诱变效应 总被引:1,自引:0,他引:1
用五种不同剂量的γ射线和5mmol/L咖啡因对大麦种子进行单独处理和γ射线与咖啡因间的复合处理,结果表明,辐照M1代的细胞学损伤及植株损指标均与辐照剂量呈直线相关,且相关系数达显著或极显著水平;M2代苗期的叶绿素突变率和性状弯异率均与辐照剂量呈指数函数关系,相关系数也均达显著或极显著水平。咖啡因本身对大麦不具诱变性,但以它作辐射后处理,不仅能加剧M1代细胞学损伤及植株损伤,而且能提高M2代叶绿素突 相似文献
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本文对10名患有腹泻或肠炎的患者和10名健康者做了肠道五种优势菌群的检测,应用模式识别对两组菌群检测值进行分析。结果,图形上两组清楚地分为两处,有明显的分界线。表明,5种菌群数值在两组间具有明显差异。经评估,可知该方法平均诊断预报能力可达75%以上。 相似文献
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抗胃酸分泌药物对胃内菌群的影响 总被引:2,自引:0,他引:2
收集40例内镜确诊为胃十二指肠溃疡病人,随机分成两组,分别予泰胃美、奥美拉唑口服;干服药前后分别行胃镜检查,并抽吸胃液行需氧菌、厌氧菌及真菌培养。结果示:胃液细菌量及硝酸盐还原菌量与胃液pH值呈正相关(r=0.802和0.7,p<0.01),抗胃酸分泌药物尤以奥美拉唑引起胃内菌量增加明显。临床治疗消化性溃疡时,应注意胃内微生态防治。 相似文献
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灭活双歧杆菌调整小鼠抗生素相关性菌群失调 总被引:10,自引:1,他引:10
目的:观察灭活的双歧杆菌及其耗尽培养上清液(SCS)对小鼠肠道生理菌群的影响。方法:应用腹腔注射青霉素造成肠菌群失调动物模型,分别以灭活的双歧杆菌菌液,耗尽培养上清液以及活菌菌液对菌群失调小鼠进行灌胃治疗。结果:活菌组、死菌组及SCS组同自然恢复组的肠道生理菌群相比差异均有显著性,死菌组与SCS组相比,差异也有显著性。结论:灭活的双歧杆菌及其SCS对小鼠肠道菌群失调的恢复具有调整作用,尤其对双歧杆菌和乳酸杆菌有更明显的扶持作用。 相似文献