Applied and Environmental Science
Research Article | Applied and Environmental ScienceAntibiotics and Host-Tailored Probiotics Similarly Modulate Effects on the Developing Avian Microbiome, Mycobiome, and Host Gene ExpressionAlternative approaches are greatly needed to reduce the need for antibiotic use in food animal production. This study utilized a pipeline for the development of a host-tailored probiotic to enhance performance in commercial turkeys and modulate their microbiota, similar to the effects of low-dose antibiotic administration. We determined that a host-tailored probiotic, developed in the context of the commercial turkey gut microbiome, was...
Editor's Pick Research Article | Applied and Environmental ScienceRapid Phenotypic and Metabolomic Domestication of Wild Penicillium Molds on CheeseIndustrial cultures of filamentous fungi are used to add unique aesthetics and flavors to cheeses and other microbial foods. How these microbes adapted to live in food environments is generally unknown as most microbial domestication is unintentional. Our work demonstrates that wild molds closely related to the starter culture Penicillium camemberti can readily lose...
Research Article | Applied and Environmental ScienceEmergent Properties in Streptococcus mutans Biofilms Are Controlled through Adhesion Force Sensing by Initial ColonizersA new concept in biofilm science is introduced: “adhesion force sensitivity of genes,” defining the degree up to which expression of different genes in adhering bacteria is controlled by the environmental adhesion forces they experience. Analysis of gene expression as a function of height in a biofilm showed that the information about the substratum surface to which initially adhering bacteria adhere is passed up to a biofilm height of...
Research Article | Applied and Environmental ScienceAnaerobic Degradation of Non-Methane Alkanes by “Candidatus Methanoliparia” in Hydrocarbon Seeps of the Gulf of MexicoOil-rich sediments from the Gulf of Mexico were found to contain diverse alkane-degrading groups of archaea. The symbiotic, consortium-forming “Candidatus Argoarchaeum” and “Candidatus Syntrophoarchaeum” are likely responsible for the degradation of ethane and short-chain alkanes, with the help of sulfate-reducing bacteria. “Ca. Methanoliparia” occurs as single cells associated with oil droplets. These archaea...
Research Article | Applied and Environmental ScienceHow Thermophilic Gram-Positive Organisms Perform Extracellular Electron Transfer: Characterization of the Cell Surface Terminal Reductase OcwAThermophilic Gram-positive organisms were recently shown to be a promising class of organisms to be used in bioelectrochemical systems for the production of electrical energy. These organisms present a thick peptidoglycan layer that was thought to preclude them to perform extracellular electron transfer (i.e., exchange catabolic electrons with solid electron acceptors outside the cell). In this paper, we describe the structure and...
Research Article | Applied and Environmental ScienceStreamlined Genetic Manipulation of Diverse Bacteroides and Parabacteroides Isolates from the Human Gut MicrobiotaWe have entered an era when studies of the gut microbiota are transitioning from basic questions of composition and host effects to understanding the microbial molecules that underlie compositional shifts and mediate health and disease processes. The importance of the gut Bacteroidales to human health and disease and their potential as a source of engineered live biotherapeutics make these bacteria of particular interest for in...
Observation | Applied and Environmental ScienceStatistical Analysis of Community RNA Transcripts between Organic Carbon and Geogas-Fed Continental Deep Biosphere GroundwatersDespite being separated from the photosynthesis-driven surface by both distance and time, the deep biosphere is an important driver for the earth’s carbon and energy cycles. However, due to the difficulties in gaining access and low cell numbers, robust statistical omics studies have not been carried out, and this limits the conclusions that can be drawn. This study benchmarks the use of two separate sampling systems and demonstrates...
Editor's Pick Research Article | Applied and Environmental ScienceA Single Biosynthetic Gene Cluster Is Responsible for the Production of Bagremycin Antibiotics and Ferroverdin Iron ChelatorsAccess to whole-genome sequences has exposed the general incidence of the so-called cryptic biosynthetic gene clusters (BGCs), thereby renewing their interest for natural product discovery. As a consequence, genome mining is the often first approach implemented to assess the potential of a microorganism for producing novel bioactive metabolites. By revealing a new level of complexity of natural product biosynthesis, we further...
Research Article | Applied and Environmental ScienceA Central Small RNA Regulatory Circuit Controlling Bacterial Denitrification and N2O EmissionsN2O is an important greenhouse gas and a major cause of ozone depletion. Denitrifying bacteria play vital roles in the production and consumption of N2O in many environments. Complete denitrification consists of the conversion of a soluble N-oxyanion, nitrate (NO3-), to an inert gaseous N-oxide, dinitrogen (N2). Incomplete denitrification can occur if conditions are prohibitive, for...
Author Reply | Applied and Environmental ScienceReply to Sun et al., “Identifying Composition Novelty in Microbiome Studies: Improvement of Prediction Accuracy”