Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 173 for “"microbial diversity"”.
-
Microbial Diversity in Young Volcanic Soils
… but has been little studied with regard to microbial communities. Analysis of the distribution of 16S and 18S rRNA genes from bacteria and eukaryotes was done to compare microbial community composition between andisols and vitrisols. An experiment with samples representing four soil depths …
-
Assessing Microbial Diversity Through Nucleotide Variation
… human body is home to a diverse assemblage of microbial species as well. In fact, the number of microbial cells in the gastrointestinal tract, oral cavity, skin, airway passages and urogenital system is approximately an order of magnitude greater than the number of cells that make up the human …
-
Microbial diversity and groundwater chemistry in a pristine aquifer
… of bacteria and archaea. We examined this microbial community at 18 wells across the aquifer by filtering cells suspended in groundwater and trapping sediment-bound populations on sterile samplers incubated in the wells themselves. After extracting DNA directly from these samples, we …
-
Microbial diversity and activity in temperate forest and grassland ecosystems
Ecosystems currently face widespread biodiversity losses and other environmental disturbances, such as climate warming, related to increased anthropogenic activities. Within this context, scientists consider the effects of such changes on the biodiversity, and hence on the activity, of soil …
-
Microbial Diversity in the Human Mouth: Dominant Genera and their Interactions.
Investigations seeking definition of the microbial diversity present in the human oral cavity have been underway for many years. These investigations seek to define the normal microflora of the oral cavity, as well as the stability of the microflora. Predominantly, these kinds of studies have …
-
Linking Plant and Soil Microbial Diversity via Plant Functional Trait Ecology
… functioning, yet our understanding of how plant diversity relates to soil microbial diversity remains rudimentary. Cover crops are increasingly promoted for their potential to enhance soil health and microbial diversity in agroecosystems, but variability in their effects highlights the need for a …
-
Role of microbial diversity in controlling greenhouse gas emissions from conserved forages
… only for fermenters but also for other diverse microbial groups such as methanogens and denitrifiers, which are involved in the production and reduction of greenhouse gases (GHGs), i.e., methane (CH₄) and nitrous oxide (N₂O). A laboratory study was conducted to examine the GHG production from …
-
Vaginal microbial diversity of the genital tract of South African adolescent females
Young, reproductive-aged women are at highest risk of acquiring human-immunodeficiency virus (HIV). The Women's Initiative in Sexual Health (WISH) study was designed to investigate potential biological reasons for this high risk in HIV negative, South African adolescent females. Little is known …
-
What Drives Gut Microbial Diversity and Community Structure Among Closely-Related Host Species?
… Phylogeny may have a unique effect on GMB diversity and community structure (i.e., a GMB profile) via phylosymbiosis, a theory in which the evolution of hosts matches the evolution of their associated microbiota. Elucidating phylosymbiosis in mammals is difficult because multiple intrinsic …
-
Identification of microbial diversity associated with post-harvest storage of rice in India
The microbial communities associated with eleven samples of milled and un-milled rice from various storage facilities and local trade markets of Haryana, India were analyzed using high-throughput pyrosequencing. Comparison of the microbial community compositions of freshly harvested paddy and …
-
Evaluation of Intestinal Microbial Diversity and a New Antibiotic Regimen in Crohn's Disease Patients
<p>Crohn's disease (CD) is a chronic granulomatous inflammatory bowel disease involving Mycobacterium avium subspecies paratuberculosis (MAP). Other microorganisms such as adherent-invasive Escherichia coli (AIEC) have also been proposed in CD association. To date, only one study investigated both …
-
Microbial diversity of a nature reserve: eukaryotic microorganisms of Mere Sands Wood in N.W. England
… expanding the Wildlife Trust’s knowledge of biodiversity at its Mere Sands Wood Nature Reserve by describing and quantifying microbial diversity and distribution using traditional protist taxonomy based on morphology. The methods employed were similar to that adopted in the studies of …
-
Geochemical characteristics and microbial diversity of CO2-rich mound springs of the Tierra Amarilla anticline, New Mexico
… research explores the water geochemistry, microbial heterogeneity, geochemical cycling, and paleohydrological longevity of a unique set of desert springs in north-central New Mexico. This series of travertine-depositing CO2-rich springs is located along the boundary zone between the …
-
Effect of soil amendments on the chemical transformation of arsenic and the microbial diversity in rice paddy microbiome
… how soil amendments affect the abundance and diversity of the arsM, 16S rRNA bacterial and ITS1 fungal genes in the rice microbiome was also investigated. Therefore, the research approach was to set up a rice microcosm experiment in a growth cabinet with a rice cultivar, ‘Yongyou12’ (a …
-
Soil Microbial Diversity and Litter Decomposition Increase with Time Since Land Use Disturbance in Tropical Montane Forests of Malaysian Borneo
… Asia. These disturbances alter soil chemistry, microbial diversity, and disrupt carbon cycling through shifts in litter decomposition. Direct links between microbial diversity and soil properties such as pH are well established; however, the indirect impacts of logging and forest conversion on …
-
Microbial Diversity and Geochemical Energy Sources of Tutum Bay, Ambitle Island, Papua New Guinea, an Arsenic-Rich, Shallow-Sea Hydrothermal System
… in Tutum Bay, significant amounts of energy for microbial metabolism could be gained from a number of reactions, including AsIII oxidizing reactions using oxygen and nitrate as terminal electron acceptors. In the third chapter, a 16S rRNA-based culture-independent investigation of the archaeal …
-
The Role of Microbial Diversity in Female Reproductive Health: An Analysis of the Microbiome's Influence on Pregnancy Outcomes in Postparturient Mares
<p>Birth is initiated by a programmed inflammatory response of the placenta and amniotic fluid carried out by maternal and fetal signals, between 37 and 42 weeks gestation for human females. When the inflammatory response occurs off schedule (prior to 37 weeks gestation), pre-term birth is …
-
Effect of a Fermented Yeast Product on the Gastrointestinal Tract Microbial Diversity of Weaned Pigs Challenged With Salmonella Enterica Typhimurium Dt104
… supplementation offers an alternative to antimicrobial growth promoters by stimulating key populations of the GIT bacteria that can ferment these non-digestible compounds, producing various short chain fatty acids used by the animal. The objective of this study was to quantify the effects of a …
Page 1 of 9