Correlation Between the Autotrophic Index and Protozoan Colonization Rates as Indicators of Pollution Stress

2009 ◽  
pp. 204-204-12 ◽  
Author(s):  
AL Buikema ◽  
J Cairns ◽  
WH Yongue
Keyword(s):  
Colonization Rates

scholarly journals Micro-Landscape Dependent Changes in Arbuscular Mycorrhizal Fungal Community Structure

2021 ◽  
Vol 11 (11) ◽  
pp. 5297
Author(s):  
Stavros D. Veresoglou ◽  
Leonie Grünfeld ◽  
Magkdi Mola
Keyword(s):  
Community Structure ◽  
Mycorrhizal Fungi ◽  
Root Colonization ◽  
Environmental Parameters ◽  
Arbuscular Mycorrhizal ◽  
Fungal Community Structure ◽  
High Connectivity ◽  
Spatio Temporal ◽  
Arbuscular Mycorrhizal Fungal ◽  
Colonization Rates

The roots of most plants host diverse assemblages of arbuscular mycorrhizal fungi (AMF), which benefit the plant hosts in diverse ways. Even though we understand that such AMF assemblages are non-random, we do not fully appreciate whether and how environmental settings can make them more or less predictable in time and space. Here we present results from three controlled experiments, where we manipulated two environmental parameters, habitat connectance and habitat quality, to address the degree to which plant roots in archipelagos of high connectivity and invariable habitats are colonized with (i) less diverse and (ii) easier to predict AMF assemblages. We observed no differences in diversity across our manipulations. We show, however, that mixing habitats and varying connectivity render AMF assemblages less predictable, which we could only detect within and not between our experimental units. We also demonstrate that none of our manipulations favoured any specific AMF taxa. We present here evidence that the community structure of AMF is less responsive to spatio-temporal manipulations than root colonization rates which is a facet of the symbiosis which we currently poorly understand.

Regional differences in vancomycin-resistant Enterococcus colonization rates in critically ill veterans

2014 ◽  
Vol 42 (11) ◽  
pp. 1226-1228
Author(s):  
Linda McKinley ◽  
Helene Moriarty ◽  
Thomas H. Short ◽  
Mary Hagle ◽  
Abigail Ranum ◽  
...  
Keyword(s):  
Critically Ill ◽  
Regional Differences ◽  
Vancomycin Resistant Enterococcus ◽  
Vancomycin Resistant ◽  
Colonization Rates

Are Surveillance of Resistant Enteric Bacilli and Antimicrobial Usage Among Neonates in a Newborn Intensive Care Unit Useful?

PEDIATRICS ◽  
1981 ◽  
Vol 68 (1) ◽  
pp. 1-4
Author(s):  
Robert D. White ◽  
Timothy R. Townsend ◽  
Maureen A. Stephens ◽  
E. Richard Moxon
Keyword(s):  
Intensive Care Unit ◽  
Intensive Care ◽  
Neonatal Sepsis ◽  
Antibiotic Use ◽  
Surveillance Data ◽  
Effective Control ◽  
Antimicrobial Usage ◽  
Newborn Intensive Care Unit ◽  
Newborn Intensive Care ◽  
Colonization Rates

From March 1976 through December 1978, the prevalence of ampicillin- and gentamicin-resistant enteric bacilli was monitored in fecal cultures of neonates in an intensive care unit. Substantial fluctuations in colonization rates were observed which did not correlate with the occurrence of sepsis due to these organisms nor with variations in antibiotic use. This experience suggests that the availability of these surveillance data did not result in more effective control of neonatal sepsis due to enteric bacilli.

Factors affecting pharyngeal Haemophilus influenzae type b colonization rates in children

1976 ◽  
Vol 4 (5) ◽  
pp. 413-417
Author(s):  
R H Michaels ◽  
C S Poziviak ◽  
F E Stonebraker ◽  
C W Norden
Keyword(s):  
Haemophilus Influenzae ◽  
Throat Swab ◽  
Economic Status ◽  
Health Department ◽  
Haemophilus Influenzae Type ◽  
Haemophilus Influenzae Type B ◽  
Type B ◽  
Older Children ◽  
Factors Affecting ◽  
Colonization Rates

Over 1,300 children were studied in an analysis of factors that might affect pharyngeal colonization with Haemophilus influenzae type b. Our semiquantitative methods for the culture of H. influenzae type b, consisting of inoculation of 0.001 ml of throat swab fluid on antiserum agar plates and division of the results into three grades of intensity, showed agreement as to intensity of colonization in over 80% of repeat throat cultures. Our data also suggest that throat swabs are more efficient than nasopharyngeal swabs for detecting colonization, particularly for older children. All 17 H. influenzae type b carriers found with either method were detected with throat swabs, but six had negative nasopharyngeal cultures; four of these six were lightly colonized older children. Furthermore, colony counts were apt to be higher on plates inoculated with throat swab fluids. The frequency of pharyngeal H. influenzae type b colonization in children visiting health department clinics and pediatricians' offices was low during the first 6 months of life (0.7%) but averaged 3 to 5% throughout the rest of childhood. Approximately two-thirds of the carriers were colonized at an intensity too low to be detected by standard laboratory techniques. No influence on colonization rates was found for sex, race, season, economic status, or common childhood infectious diseases such as coryza or otitis media.

scholarly journals Pneumococcal Colonization Rates in Patients Admitted to a United Kingdom Hospital with Lower Respiratory Tract Infection: a Prospective Case-Control Study

2016 ◽  
Vol 54 (4) ◽  
pp. 944-949 ◽  
Author(s):  
Andrea M. Collins ◽  
Catherine M. K. Johnstone ◽  
Jenna F. Gritzfeld ◽  
Antonia Banyard ◽  
Carole A. Hancock ◽  
...  
Keyword(s):  
United Kingdom ◽  
Lower Respiratory Tract ◽  
Case Control Study ◽  
Case Control ◽  
The United Kingdom ◽  
Pneumococcal Colonization ◽  
Classical Culture ◽  
Control Study ◽  
Colonization Rates ◽  
Prospective Case Control Study

Current diagnostic tests are ineffective for identifying the etiological pathogen in hospitalized adults with lower respiratory tract infections (LRTIs). The association of pneumococcal colonization with disease has been suggested as a means to increase the diagnostic precision. We compared the pneumococcal colonization rates and the densities of nasal pneumococcal colonization by (i) classical culture and (ii) quantitative real-time PCR (qPCR) targetinglytAin patients with LRTIs admitted to a hospital in the United Kingdom and control patients. A total of 826 patients were screened for inclusion in this prospective case-control study. Of these, 38 patients were recruited, 19 with confirmed LRTIs and 19 controls with other diagnoses. Nasal wash (NW) samples were collected at the time of recruitment. Pneumococcal colonization was detected in 1 patient with LRTI and 3 controls (P= 0.6) by classical culture. By qPCR, pneumococcal colonization was detected in 10 LRTI patients and 8 controls (P= 0.5). Antibiotic usage prior to sampling was significantly higher in the LRTI group than in the control group (19 versus 3;P< 0.001). With a clinically relevant cutoff of >8,000 copies/ml on qPCR, pneumococcal colonization was found in 3 LRTI patients and 4 controls (P> 0.05). We conclude that neither the prevalence nor the density of nasal pneumococcal colonization (by culture and qPCR) can be used as a method of microbiological diagnosis in hospitalized adults with LRTI in the United Kingdom. A community-based study recruiting patients prior to antibiotic therapy may be a useful future step.

scholarly journals Removal of Soil Microbes Alters Interspecific Competitiveness of Epichloë Endophyte-Infected over Endophyte-Free Leymus chinensis

2020 ◽  
Vol 8 (2) ◽  
pp. 219
Author(s):  
Hui Liu ◽  
Jing Chen ◽  
Tianzi Qin ◽  
Xinjian Shi ◽  
Yubao Gao ◽  
...  
Keyword(s):  
Interspecific Competition ◽  
Competitive Ability ◽  
Soil Microbes ◽  
Leymus Chinensis ◽  
Competitive Advantages ◽  
Soil Environment ◽  
Plant Soil ◽  
Epichloë Endophytes ◽  
Colonization Rates ◽  
Epichloë Endophyte

Epichloë endophytes may not only affect the growth and resistances of host grasses, but may also affect soil environment including soil microbes. Can Epichloë endophyte-mediated modification of soil microbes affect the competitive ability of host grasses? In this study, we tested whether Epichloë endophytes and soil microbes alter intraspecific competition between Epichloë endophyte-colonized (EI) and endophyte-free (EF) Leymus chinensis and interspecific competition between L. chinensis and Stipa krylovii. The results demonstrated that Epichloë endophyte colonization significantly enhanced the intraspecific competitive ability of L. chinensis and that this beneficial effect was not affected by soil microbes. Under interspecific competition, however, significant interactions between Epichloë endophytes and soil microbes were observed. The effect of Epichloë endophytes on interspecific competitiveness of the host changed from positive to neutral with soil microbe removal. Here higher mycorrhizal colonization rates probably contributed to interspecific competitive advantages of EI over EF L. chinensis. Our result suggests that Epichloë endophytes can influence the competitive ability of the host through plant soil feedbacks from the currently competing plant species.

Probiotics for Disease Prevention: A Focus on Ventilator-Associated Pneumonia

2011 ◽  
Vol 45 (11) ◽  
pp. 1425-1432 ◽  
Author(s):  
Jennifer L Bailey ◽  
Siu Yan Yeung
Keyword(s):  
Antimicrobial Agents ◽  
Future Research ◽  
Published Data ◽  
Ventilator Associated Pneumonia ◽  
Mechanically Ventilated ◽  
Mechanically Ventilated Patients ◽  
Patient Disposition ◽  
Significant Difference ◽  
Colonization Rates ◽  
Ventilated Patients

Objective: To summarize published data regarding the safety and efficacy of probiotics in the prevention of ventilator-associated pneumonia (VAP). Data Sources: PubMed databases (January 2000-August 2011) were searched and a bibliographic review of published articles was performed to identify original reports of probiotic administration for the prevention of VAP using the search terms probiotics, synbiotics, and ventilator-associated pneumonia. Study Selection and Data Extraction: Two pilot studies, 2 randomized controlled trials (RCTs), and 1 meta-analysis have addressed probiotic use for VAP prevention and were included in the review. Data Synthesis: VAP frequently occurs in mechanically ventilated patients. Given the lack of new antimicrobial agents, probiotics have been studied for their ability to modify human microflora colonization. Two studies examining pathogen colonization rates favored probiotics, with reduced incidence and increased duration until the emergence of new species. One prospective RCT found significant reduction in the incidence of VAP and colonization rates, but no significant difference in patient disposition outcomes. Another RCT examining 28-day mortality found no overall benefit with probiotic use and no reduction in colonization rates. Conclusions: Clinical trials have failed to demonstrate a consistent beneficial effect of probiotics in mechanically ventilated patients; thus, they are not recommended for routine clinical use. However, heterogeneity among study designs may hinder this assessment and the designs should be unified in future research.

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