Human Fecal Flora under Controlled Diet Intake

Speck, R. S.; Calloway, Doris Howes; Hadley, W K

doi:10.1093/ajcn/23.11.1488

Cited by 21 publications

(6 citation statements)

References 4 publications

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“…In the present investigation, the median number of anaerobes cultured per g faeces from healthy subjects was 10-65. Though not optimal, this yield equals that reported in other recent studies (Speck, Calloway & Hadley, 1970;Crowther et al 1973; Bornside & Cohn, 1975;Drasar, Jenkins & Cummings, 1976) and can be considered sufficient when a detailed inventory is not intended. Our findings that anaerobic gramnegative and gram-positive rods occurred in equal numbers and that E. aerofaciens and bifidobacteria formed about 30 % of the gram-positive rods agree reasonably well with data in the cited literature.…”

Section: Discussionsupporting

confidence: 60%

The faecal flora of patients with Crohn's disease

Wensinck

1975

Antonie van Leeuwenhoek

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Section: Discussionsupporting

confidence: 60%

The faecal flora of patients with Crohn's disease

Wensinck

1975

Antonie van Leeuwenhoek

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“…Largely unabsorbed, t h e a-galactosides pass into t h e lower intestine where microorganisms ferment t h e m contributing to the production of flatus (Bergey, 1 9 5 7 ;Speck et al, 1970).…”

Section: Introductionmentioning

confidence: 99%

Conditions for the Autolysis of Alpha‐galactosides and Phytic Acid in California Small White Beans

Becker

Olson

Frederick

et al. 1974

Journal of Food Science

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S The conditions for the autolysis of stachyose, raffinose and phytic acid in California small white beans were determined. It was found that initially the beans contain about 3.7% stachyose, 0.4% raffinose and no detectable verbascose. Optimum conditions for autolysis of these sugars are pH 5 and 45–65°C. Approximately 30% of the sugars are hydrolyzed in 9 hr, 50% in 24 hr and 70% in 48 hr. Disappearance of the oligosaccharides is accompanied by corresponding increases in galactose and sucrose. Other changes occur during incubation, including the hydrolysis of phytic acid with the production of inorganic phosphate and inositol. Optimum conditions for the production of inorganic phosphate and inositol are pH 5 and 35–45°C. When fed to rats incubated preparations of beans produced less hydrogen than nonincubated preparations.

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“…Similar person-to-person variation was demonstrated earlier in studies of the human intestinal flora (3,13,25). It appears that each individual tends to maintain his or her own type of flora, and attempts to permanently modify individual flora composition usually are unsuccessful (3,5,25,34). Large person-to-person variation in composition of the bacterial flora is the major reason that numerous subjects are required to obtain statistically significant results in studies of populations or of human diseases that may relate to indigenous floras.…”

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confidence: 99%

Investigation of the influences of puberty, genetics, and environment on the composition of subgingival periodontal floras

et al. 1993

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The classical twin model was utilized in this study in an attempt to determine the importance of host genetics to the composition of the subgingival flora. Simultaneously, the effect of puberty on the flora composition was assessed. The compositions of the floras were significantly different at ages 11 and 14 in the same people, indicating that transition to an adult flora composition may be initiated during puberty. However, the numbers of subjects who had prepubertal and postpubertal testosterone levels in this study were too small to demonstrate significant differences based solely on testosterone level (P = 0.053 and 0.11 for tests of unrelated members, i.e., all twins "a," the first twin of each pair, and all twins "b," the second twin of each pair). Sixteen unrelated 11-year-old subjects had prepubertal levels of less than 30 ng of testosterone per dl of serum, and only six of these unrelated subjects had levels above 300 ngldl by age 14. Of their twin siblings, who formed the second group of unrelated individuals, 15 had prepubertal levels and only 5 reached postpubertal levels. Unpaired t tests indicated that VeilloneUla atypica, PrevoteUla denticola, and PrevoteUla melaninogenica were among the species that contributed most to changes in flora composition during puberty. The compositions of subgingival floras of 11-year-old monozygous and dizygous male twins were significantly more similar than those of unrelated subjects in the study (P = 0.004 and 0.009, respectively). At 12.5 years of age, the floras of monozygous twins remained more similar than those of unrelated subjects (P = 0.001), but the dizygous-twin floras were not significantly more similar than those of unrelated people. This difference corresponded with moderate and varied testosterone levels within dizygous-twin pairs at age 12.5. By age 14 both monozygous and dizygous twins again had floras with compositions more similar than those of unrelated people (P = 0.008 and 0.002, respectively). Estimates of the genetic contributions to the increased similarity of the floras of twins as compared with floras of unrelated people indicated that the concentrations of several species in the flora may be influenced by host genetic factors. The prevalence of certain other species appeared to be controlled

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Human Fecal Flora under Controlled Diet Intake

Cited by 21 publications

References 4 publications

The faecal flora of patients with Crohn's disease

The faecal flora of patients with Crohn's disease

Conditions for the Autolysis of Alpha‐galactosides and Phytic Acid in California Small White Beans

Investigation of the influences of puberty, genetics, and environment on the composition of subgingival periodontal floras

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