DM891129菌株对沙土鼠高胆固醇血症的影响

本项研究的目的是通过动物实验来观察由健康人分离出的肠球菌DM891129菌株的降血脂作用。本实验选42只沙土鼠(gerible),雌雄各半,随机分为3组,第1组13只为正常组;第2组13只,在正常饮食中 5％胆固醇饲喂1周;第3组16只,在第2组饮食的基础上,每天以肠球菌(DM891129)菌悬液(10~9个细菌/ml)0.5ml/次,Bid灌胃一周。3组沙土鼠以眼球采血,分别检测血清胆固醇、甘油三酯和胆酸水平及粪便中肠球菌和肠杆菌水平。结果表明:第2组胆固醇水平较第1组明显升高(P<0.001)。第3组胆固醇水平较第2组明显降低(P<0.001)。相应的、第3组鼠粪便肠球菌水平明显高于第1、2组(P<0.05),而1、2组之间无显著性差异,第2、3组肠杆菌水平明显高于第1组(P<0.02、P<0.05),2、3组肠杆菌水平无显著性差异。胆酸、甘油三酯水平3组之间无显著性差异。可见DM891129菌株对沙土鼠高胆固醇饮食所致的高胆固醇血症具有明显的降低作用而对血甘油三酯、胆酸水平无显著性影响。现在对DM891129菌株体内降血胆固醇水平的机制尚不清楚,有待于进一步研究。     

利用简便微量法定量检测肠道正常菌群

利用简便微量法定量检测肠道正常菌群中的双歧杆菌和肠杆菌,10次检测结果与常规法无显著性差异。简便微量法主要优点是简便易行,节省人力物力和时间。     

Abundance of algal species in relation to soil types and major crops in cultivated soils of Karnataka state (India)

Summary An attempt was made to study the number of species belonging to Cyanophyceae, Chlorophyceae and Bacillariophyceae in Lateritic, Red and Black soils and also Dry lands (jowar, cotton and wheat) and Wet lands (paddy and sugar cane). Lateritic and black soils had a poor algal flora and in general sandy soils were rich. Cyanophyceae appeared to be more resistant than Chlorophyceae and Bacillariophyceae to desiccation. Part of the Ph.D. Thesis approved by the Karnatak University (1976).     

Attributes of the plankton flora at Bushehr,Iran

The plankton flora on the northeastern coast of the Gulf of Persia consists of many diatom species, the coccolithophores Gephyrocapsa oceanica and Coccolithus huxleyi, and the blue-green alga, Trichodesmium thiebautii. These are prevalent throughout the year and always at low concentrations, with an average maximum in January of 14463 cells/liter and minimum in June of 802/liter. Such comparative constancy suggests that the flora has the attribute of stability. The individual species fluctuate in a patternless, uncorrelated manner, so that the flora is characterized by the attribute of unpredictability. The turbidity of the shallow water reduces the light so that light is usually neither limiting nor inhibitory. There is a small amount of nitrate always available and ample phosphate and silicate. Pure culture studies of several species show growth from about 12° to 34°. The water was 34° in August of 1977. The flora's responsiveness to these light, nutrient, and temperature quantities makes possible its recovery to normal after advective disturbance in June 1977.Contribution number 4574 from the Woods Hole Oceanographic Institution.Contribution number 4574 from the Woods Hole Oceanographic Institution.     

A phytosociological study of weed communities on the southwestern Coastal Plain of North Carolina

Summary The vegetation of cultivated, fallow and ‘old’ fields of Scotland County, N.C. was both randomly and subjectively sampled throughout the growing season of 1973. Relevés were placed in each of the above management units, and the data collected in this relevé analysis were sorted into phytosociological charts, with the aid of the digital computer. Weed associations delimited in the charts reflected the importance of edaphic factors, time (aspect), and man's agricultural activities as causal factors in the determination of characteristic assemblages of weeds. Several character and differential species were denoted, in a tentative classification of the weed associations. The cultivated and fallow stands in the spring aspect were noted to be dominated by a group of spring annuals. Summer annuals were more prevalent in homologous situations in the summer. It was determined that perennials, appearing mainly as seedlings in cultivated and fallow fields, attained dominance in ‘old’ fields, one to five years in age. Within each of the major spheres of management, and in each season, associations of weeds mainly reflected differences in edaphic factors. Many character species were noted to maintain affinities to an assortment of soil types that ranged from moist loams to xeric, sterile sands. A study of roadsides, hedgerows, field margins and other ecotonal areas inhabited by weeds was carried throughout the growing season of 1973, also. Species presence was documented in each of these habitat types and reported in Sharp (1974). The weed flora of Scotland County was found to be rich in species. A total of 506 species representing 248 genera and 80 families were encountered throughout the study. Of the total number of species listed, approximately 25 percent were of foreign origin, and 28 percent represented additions to the flora of Scotland County. This paper is the short version of a masters thesis for the Department of Botany, University of North Carolina at Chapel Hill. The author would like to extend his appreciation and gratitude to Professors H. Lieth, A. E. Radford and J. Hardin for their generous advice and encouragement extended through the duration of the study.     

Über zwei diploide,in Südwest-Anatolien endemische Arten aus dem Komplex derVeronica cymbalaria (Scrophulariaceae)

Veronica lycica Lehm. is a distinct, diploid member of theVeronica cymbalaria group, endemic in Lycia (S.W. Anatolia). Closely related is the newV. stamatiadae M. Fischer etW. Greuter which is also diploid and seems to be restricted to the small Greek island Ro close to the South coast of Lycia. The chromosome numbers for both species are reported for the first time (2n = 18).

Untersuchungen über den PolyploidkomplexVeronica cymbalaria agg., II. — Der erste Beitrag dieser Serie:Fischer (1975).     

Blastocystis hominis: pathogenic potential in human patients and in gnotobiotes.

Germfree guinea pigs were inoculated orally, in some experiments, and intracecally, in others, with Blastocystis hominis and the enteric flora from symptomatic patients. Other germfree guinea pigs received the parasite from axenic culture and still others from monoxenic culture with Proteus vulgaris. Fourteen of 43 animals inoculated orally with B. hominis and patient's enteric flora developed B. hominis infections and those with particularly heavy infections developed watery diarrhea of more than 1 week's duration immediately prior to sacrifice. Similar results were obtained from intracecal inoculations in that 13 of 28 animals developed infections and those with the greatest numbers of B. hominis had watery diarrhea for more than 1 week prior to sacrifice. Gross pathologic changes in these animals were mostly unremarkable, with only a slight hyperemia observed in several of the symptomatic animals. Microscopic examination, however, revealed frequent penetration of intestinal epithelium by B. hominis and the parasites in significant numbers were observed within the epithelium. There was a slight increase in cellularity in the lamina propria but parasites were not observed therein and their presence in the epithelium did not provoke an inflammatory response. Only one of eight animals inoculated from monoxenic cultures developed B. hominis infection (asymptomatic), and infections were not produced in animals inoculated from axenic culture. As a result of our observations of diarrhea in patients with particularly heavy infections with B. hominis together with the demonstration of similar symptoms in animals heavily infected with this parasite, we believe B. hominis may occasionally be related causally to the production of such symptoms by a mechanism not completely understandable.