Bacteria: One of the three domains of life (the others being Eukarya and ARCHAEA), also called Eubacteria. They are unicellular prokaryotic microorganisms which generally possess rigid cell walls, multiply by cell division, and exhibit three principal forms: round or coccal, rodlike or bacillary, and spiral or spirochetal. Bacteria can be classified by their response to OXYGEN: aerobic, anaerobic, or facultatively anaerobic; by the mode by which they obtain their energy: chemotrophy (via chemical reaction) or PHOTOTROPHY (via light reaction); for chemotrophs by their source of chemical energy: CHEMOLITHOTROPHY (from inorganic compounds) or chemoorganotrophy (from organic compounds); and by their source for CARBON; NITROGEN; etc.; HETEROTROPHY (from organic sources) or AUTOTROPHY (from CARBON DIOXIDE). They can also be classified by whether or not they stain (based on the structure of their CELL WALLS) with CRYSTAL VIOLET dye: gram-negative or gram-positive.Gram-Negative Bacteria: Bacteria which lose crystal violet stain but are stained pink when treated by Gram's method.Gram-Positive Bacteria: Bacteria which retain the crystal violet stain when treated by Gram's method.Bacteria, AnaerobicRNA, Ribosomal, 16S: Constituent of 30S subunit prokaryotic ribosomes containing 1600 nucleotides and 21 proteins. 16S rRNA is involved in initiation of polypeptide synthesis.Bacteria, AerobicDNA, Bacterial: Deoxyribonucleic acid that makes up the genetic material of bacteria.Molecular Sequence Data: Descriptions of specific amino acid, carbohydrate, or nucleotide sequences which have appeared in the published literature and/or are deposited in and maintained by databanks such as GENBANK, European Molecular Biology Laboratory (EMBL), National Biomedical Research Foundation (NBRF), or other sequence repositories.Bacterial Proteins: Proteins found in any species of bacterium.Phylogeny: The relationships of groups of organisms as reflected by their genetic makeup.Escherichia coli: A species of gram-negative, facultatively anaerobic, rod-shaped bacteria (GRAM-NEGATIVE FACULTATIVELY ANAEROBIC RODS) commonly found in the lower part of the intestine of warm-blooded animals. It is usually nonpathogenic, but some strains are known to produce DIARRHEA and pyogenic infections. Pathogenic strains (virotypes) are classified by their specific pathogenic mechanisms such as toxins (ENTEROTOXIGENIC ESCHERICHIA COLI), etc.DNA, Ribosomal: DNA sequences encoding RIBOSOMAL RNA and the segments of DNA separating the individual ribosomal RNA genes, referred to as RIBOSOMAL SPACER DNA.Sequence Analysis, DNA: A multistage process that includes cloning, physical mapping, subcloning, determination of the DNA SEQUENCE, and information analysis.Water Microbiology: The presence of bacteria, viruses, and fungi in water. This term is not restricted to pathogenic organisms.Gram-Negative Aerobic Bacteria: A large group of aerobic bacteria which show up as pink (negative) when treated by the gram-staining method. This is because the cell walls of gram-negative bacteria are low in peptidoglycan and thus have low affinity for violet stain and high affinity for the pink dye safranine.Gram-Negative Anaerobic Bacteria: A large group of anaerobic bacteria which show up as pink (negative) when treated by the Gram-staining method.Bacterial Physiological Phenomena: Physiological processes and properties of BACTERIA.Soil Microbiology: The presence of bacteria, viruses, and fungi in the soil. This term is not restricted to pathogenic organisms.Anti-Bacterial Agents: Substances that reduce the growth or reproduction of BACTERIA.Sulfur-Reducing Bacteria: A group of gram-negative, anaerobic bacteria that is able to oxidize acetate completely to carbon dioxide using elemental sulfur as the electron acceptor.Genes, Bacterial: The functional hereditary units of BACTERIA.RNA, Bacterial: Ribonucleic acid in bacteria having regulatory and catalytic roles as well as involvement in protein synthesis.Seawater: The salinated water of OCEANS AND SEAS that provides habitat for marine organisms.Colony Count, Microbial: Enumeration by direct count of viable, isolated bacterial, archaeal, or fungal CELLS or SPORES capable of growth on solid CULTURE MEDIA. The method is used routinely by environmental microbiologists for quantifying organisms in AIR; FOOD; and WATER; by clinicians for measuring patients' microbial load; and in antimicrobial drug testing.Gene Expression Regulation, Bacterial: Any of the processes by which cytoplasmic or intercellular factors influence the differential control of gene action in bacteria.Culture Media: Any liquid or solid preparation made specifically for the growth, storage, or transport of microorganisms or other types of cells. The variety of media that exist allow for the culturing of specific microorganisms and cell types, such as differential media, selective media, test media, and defined media. Solid media consist of liquid media that have been solidified with an agent such as AGAR or GELATIN.Anaerobiosis: The complete absence, or (loosely) the paucity, of gaseous or dissolved elemental oxygen in a given place or environment. (From Singleton & Sainsbury, Dictionary of Microbiology and Molecular Biology, 2d ed)Genes, rRNA: Genes, found in both prokaryotes and eukaryotes, which are transcribed to produce the RNA which is incorporated into RIBOSOMES. Prokaryotic rRNA genes are usually found in OPERONS dispersed throughout the GENOME, whereas eukaryotic rRNA genes are clustered, multicistronic transcriptional units.Genome, Bacterial: The genetic complement of a BACTERIA as represented in its DNA.Symbiosis: The relationship between two different species of organisms that are interdependent; each gains benefits from the other or a relationship between different species where both of the organisms in question benefit from the presence of the other.Base Composition: The relative amounts of the PURINES and PYRIMIDINES in a nucleic acid.Biodegradation, Environmental: Elimination of ENVIRONMENTAL POLLUTANTS; PESTICIDES and other waste using living organisms, usually involving intervention of environmental or sanitation engineers.Bacterial Adhesion: Physicochemical property of fimbriated (FIMBRIAE, BACTERIAL) and non-fimbriated bacteria of attaching to cells, tissue, and nonbiological surfaces. It is a factor in bacterial colonization and pathogenicity.Amino Acid Sequence: The order of amino acids as they occur in a polypeptide chain. This is referred to as the primary structure of proteins. It is of fundamental importance in determining PROTEIN CONFORMATION.Pseudomonas: A genus of gram-negative, aerobic, rod-shaped bacteria widely distributed in nature. Some species are pathogenic for humans, animals, and plants.Species Specificity: The restriction of a characteristic behavior, anatomical structure or physical system, such as immune response; metabolic response, or gene or gene variant to the members of one species. It refers to that property which differentiates one species from another but it is also used for phylogenetic levels higher or lower than the species.Enterobacteriaceae: A family of gram-negative, facultatively anaerobic, rod-shaped bacteria that do not form endospores. Its organisms are distributed worldwide with some being saprophytes and others being plant and animal parasites. Many species are of considerable economic importance due to their pathogenic effects on agriculture and livestock.Base Sequence: The sequence of PURINES and PYRIMIDINES in nucleic acids and polynucleotides. It is also called nucleotide sequence.Fresh Water: Water containing no significant amounts of salts, such as water from RIVERS and LAKES.Bacteriological Techniques: Techniques used in studying bacteria.Gammaproteobacteria: A group of the proteobacteria comprised of facultatively anaerobic and fermentative gram-negative bacteria.Biofilms: Encrustations, formed from microbes (bacteria, algae, fungi, plankton, or protozoa) embedding in extracellular polymers, that adhere to surfaces such as teeth (DENTAL DEPOSITS); PROSTHESES AND IMPLANTS; and catheters. Biofilms are prevented from forming by treating surfaces with DENTIFRICES; DISINFECTANTS; ANTI-INFECTIVE AGENTS; and antifouling agents.Microbial Sensitivity Tests: Any tests that demonstrate the relative efficacy of different chemotherapeutic agents against specific microorganisms (i.e., bacteria, fungi, viruses).Bacterial Infections: Infections by bacteria, general or unspecified.Fermentation: Anaerobic degradation of GLUCOSE or other organic nutrients to gain energy in the form of ATP. End products vary depending on organisms, substrates, and enzymatic pathways. Common fermentation products include ETHANOL and LACTIC ACID.Geologic Sediments: A mass of organic or inorganic solid fragmented material, or the solid fragment itself, that comes from the weathering of rock and is carried by, suspended in, or dropped by air, water, or ice. It refers also to a mass that is accumulated by any other natural agent and that forms in layers on the earth's surface, such as sand, gravel, silt, mud, fill, or loess. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed, p1689)Proteobacteria: A phylum of bacteria consisting of the purple bacteria and their relatives which form a branch of the eubacterial tree. This group of predominantly gram-negative bacteria is classified based on homology of equivalent nucleotide sequences of 16S ribosomal RNA or by hybridization of ribosomal RNA or DNA with 16S and 23S ribosomal RNA.Bacteroides: A genus of gram-negative, anaerobic, rod-shaped bacteria. Its organisms are normal inhabitants of the oral, respiratory, intestinal, and urogenital cavities of humans, animals, and insects. Some species may be pathogenic.Aerobiosis: Life or metabolic reactions occurring in an environment containing oxygen.Bacterial Typing Techniques: Procedures for identifying types and strains of bacteria. The most frequently employed typing systems are BACTERIOPHAGE TYPING and SEROTYPING as well as bacteriocin typing and biotyping.Pseudomonas aeruginosa: A species of gram-negative, aerobic, rod-shaped bacteria commonly isolated from clinical specimens (wound, burn, and urinary tract infections). It is also found widely distributed in soil and water. P. aeruginosa is a major agent of nosocomial infection.Staphylococcus aureus: Potentially pathogenic bacteria found in nasal membranes, skin, hair follicles, and perineum of warm-blooded animals. They may cause a wide range of infections and intoxications.Betaproteobacteria: A class in the phylum PROTEOBACTERIA comprised of chemoheterotrophs and chemoautotrophs which derive nutrients from decomposition of organic material.Microbial Viability: Ability of a microbe to survive under given conditions. This can also be related to a colony's ability to replicate.Vibrio: A genus of VIBRIONACEAE, made up of short, slightly curved, motile, gram-negative rods. Various species produce cholera and other gastrointestinal disorders as well as abortion in sheep and cattle.Streptococcus: A genus of gram-positive, coccoid bacteria whose organisms occur in pairs or chains. No endospores are produced. Many species exist as commensals or parasites on man or animals with some being highly pathogenic. A few species are saprophytes and occur in the natural environment.Cytophaga: A genus of gram-negative gliding bacteria found in SOIL; HUMUS; and FRESHWATER and marine habitats.Virulence: The degree of pathogenicity within a group or species of microorganisms or viruses as indicated by case fatality rates and/or the ability of the organism to invade the tissues of the host. The pathogenic capacity of an organism is determined by its VIRULENCE FACTORS.Hydrogen-Ion Concentration: The normality of a solution with respect to HYDROGEN ions; H+. It is related to acidity measurements in most cases by pH = log 1/2[1/(H+)], where (H+) is the hydrogen ion concentration in gram equivalents per liter of solution. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)Fatty Acids: Organic, monobasic acids derived from hydrocarbons by the equivalent of oxidation of a methyl group to an alcohol, aldehyde, and then acid. Fatty acids are saturated and unsaturated (FATTY ACIDS, UNSATURATED). (Grant & Hackh's Chemical Dictionary, 5th ed)Bacillus: A genus of BACILLACEAE that are spore-forming, rod-shaped cells. Most species are saprophytic soil forms with only a few species being pathogenic.Temperature: The property of objects that determines the direction of heat flow when they are placed in direct thermal contact. The temperature is the energy of microscopic motions (vibrational and translational) of the particles of atoms.Cloning, Molecular: The insertion of recombinant DNA molecules from prokaryotic and/or eukaryotic sources into a replicating vehicle, such as a plasmid or virus vector, and the introduction of the resultant hybrid molecules into recipient cells without altering the viability of those cells.Polymerase Chain Reaction: In vitro method for producing large amounts of specific DNA or RNA fragments of defined length and sequence from small amounts of short oligonucleotide flanking sequences (primers). The essential steps include thermal denaturation of the double-stranded target molecules, annealing of the primers to their complementary sequences, and extension of the annealed primers by enzymatic synthesis with DNA polymerase. The reaction is efficient, specific, and extremely sensitive. Uses for the reaction include disease diagnosis, detection of difficult-to-isolate pathogens, mutation analysis, genetic testing, DNA sequencing, and analyzing evolutionary relationships.Plasmids: Extrachromosomal, usually CIRCULAR DNA molecules that are self-replicating and transferable from one organism to another. They are found in a variety of bacterial, archaeal, fungal, algal, and plant species. They are used in GENETIC ENGINEERING as CLONING VECTORS.Oxidation-Reduction: A chemical reaction in which an electron is transferred from one molecule to another. The electron-donating molecule is the reducing agent or reductant; the electron-accepting molecule is the oxidizing agent or oxidant. Reducing and oxidizing agents function as conjugate reductant-oxidant pairs or redox pairs (Lehninger, Principles of Biochemistry, 1982, p471).Salmonella typhimurium: A serotype of Salmonella enterica that is a frequent agent of Salmonella gastroenteritis in humans. It also causes PARATYPHOID FEVER.Archaea: One of the three domains of life (the others being BACTERIA and Eukarya), formerly called Archaebacteria under the taxon Bacteria, but now considered separate and distinct. They are characterized by: (1) the presence of characteristic tRNAs and ribosomal RNAs; (2) the absence of peptidoglycan cell walls; (3) the presence of ether-linked lipids built from branched-chain subunits; and (4) their occurrence in unusual habitats. While archaea resemble bacteria in morphology and genomic organization, they resemble eukarya in their method of genomic replication. The domain contains at least four kingdoms: CRENARCHAEOTA; EURYARCHAEOTA; NANOARCHAEOTA; and KORARCHAEOTA.Mutation: Any detectable and heritable change in the genetic material that causes a change in the GENOTYPE and which is transmitted to daughter cells and to succeeding generations.Fungi: A kingdom of eukaryotic, heterotrophic organisms that live parasitically as saprobes, including MUSHROOMS; YEASTS; smuts, molds, etc. They reproduce either sexually or asexually, and have life cycles that range from simple to complex. Filamentous fungi, commonly known as molds, refer to those that grow as multicellular colonies.Feces: Excrement from the INTESTINES, containing unabsorbed solids, waste products, secretions, and BACTERIA of the DIGESTIVE SYSTEM.Gram-Negative Bacterial Infections: Infections caused by bacteria that show up as pink (negative) when treated by the gram-staining method.Antibiosis: A natural association between organisms that is detrimental to at least one of them. This often refers to the production of chemicals by one microorganism that is harmful to another.Clostridium: A genus of motile or nonmotile gram-positive bacteria of the family Clostridiaceae. Many species have been identified with some being pathogenic. They occur in water, soil, and in the intestinal tract of humans and lower animals.Sequence Homology, Amino Acid: The degree of similarity between sequences of amino acids. This information is useful for the analyzing genetic relatedness of proteins and species.Eubacterium: A genus of gram-positive, rod-shaped bacteria found in cavities of man and animals, animal and plant products, infections of soft tissue, and soil. Some species may be pathogenic. No endospores are produced. The genus Eubacterium should not be confused with EUBACTERIA, one of the three domains of life.Bacillus subtilis: A species of gram-positive bacteria that is a common soil and water saprophyte.Intestines: The section of the alimentary canal from the STOMACH to the ANAL CANAL. It includes the LARGE INTESTINE and SMALL INTESTINE.Actinobacteria: Class of BACTERIA with diverse morphological properties. Strains of Actinobacteria show greater than 80% 16S rDNA/rRNA sequence similarity among each other and also the presence of certain signature nucleotides. (Stackebrandt E. et al, Int. J. Syst. Bacteriol. (1997) 47:479-491)Mouth: The oval-shaped oral cavity located at the apex of the digestive tract and consisting of two parts: the vestibule and the oral cavity proper.Bacterial Outer Membrane Proteins: Proteins isolated from the outer membrane of Gram-negative bacteria.Corynebacterium: A genus of asporogenous bacteria that is widely distributed in nature. Its organisms appear as straight to slightly curved rods and are known to be human and animal parasites and pathogens.Bacterial Load: Measurable quantity of bacteria in an object, organism, or organism compartment.Sequence Alignment: The arrangement of two or more amino acid or base sequences from an organism or organisms in such a way as to align areas of the sequences sharing common properties. The degree of relatedness or homology between the sequences is predicted computationally or statistically based on weights assigned to the elements aligned between the sequences. This in turn can serve as a potential indicator of the genetic relatedness between the organisms.Phagocytosis: The engulfing and degradation of microorganisms; other cells that are dead, dying, or pathogenic; and foreign particles by phagocytic cells (PHAGOCYTES).Food Microbiology: The presence of bacteria, viruses, and fungi in food and food products. This term is not restricted to pathogenic organisms: the presence of various non-pathogenic bacteria and fungi in cheeses and wines, for example, is included in this concept.Gastrointestinal Tract: Generally refers to the digestive structures stretching from the MOUTH to ANUS, but does not include the accessory glandular organs (LIVER; BILIARY TRACT; PANCREAS).Deltaproteobacteria: A group of PROTEOBACTERIA represented by morphologically diverse, anaerobic sulfidogens. Some members of this group are considered bacterial predators, having bacteriolytic properties.Gram-Negative Aerobic Rods and Cocci: A group of gram-negative bacteria consisting of rod- and coccus-shaped cells. They are both aerobic (able to grow under an air atmosphere) and microaerophilic (grow better in low concentrations of oxygen) under nitrogen-fixing conditions but, when supplied with a source of fixed nitrogen, they grow as aerobes.Listeria monocytogenes: A species of gram-positive, rod-shaped bacteria widely distributed in nature. It has been isolated from sewage, soil, silage, and from feces of healthy animals and man. Infection with this bacterium leads to encephalitis, meningitis, endocarditis, and abortion.Cell Wall: The outermost layer of a cell in most PLANTS; BACTERIA; FUNGI; and ALGAE. The cell wall is usually a rigid structure that lies external to the CELL MEMBRANE, and provides a protective barrier against physical or chemical agents.Bacteroidetes: A phylum of bacteria comprised of three classes: Bacteroides, Flavobacteria, and Sphingobacteria.Gene Transfer, Horizontal: The naturally occurring transmission of genetic information between organisms, related or unrelated, circumventing parent-to-offspring transmission. Horizontal gene transfer may occur via a variety of naturally occurring processes such as GENETIC CONJUGATION; GENETIC TRANSDUCTION; and TRANSFECTION. It may result in a change of the recipient organism's genetic composition (TRANSFORMATION, GENETIC).Chlorobi: A phylum of anoxygenic, phototrophic bacteria including the family Chlorobiaceae. They occur in aquatic sediments, sulfur springs, and hot springs and utilize reduced sulfur compounds instead of oxygen.Drug Resistance, Bacterial: The ability of bacteria to resist or to become tolerant to chemotherapeutic agents, antimicrobial agents, or antibiotics. This resistance may be acquired through gene mutation or foreign DNA in transmissible plasmids (R FACTORS).Air Microbiology: The presence of bacteria, viruses, and fungi in the air. This term is not restricted to pathogenic organisms.Drug Resistance, Microbial: The ability of microorganisms, especially bacteria, to resist or to become tolerant to chemotherapeutic agents, antimicrobial agents, or antibiotics. This resistance may be acquired through gene mutation or foreign DNA in transmissible plasmids (R FACTORS).Probiotics: Live microbial DIETARY SUPPLEMENTS which beneficially affect the host animal by improving its intestinal microbial balance. Antibiotics and other related compounds are not included in this definition. In humans, lactobacilli are commonly used as probiotics, either as single species or in mixed culture with other bacteria. Other genera that have been used are bifidobacteria and streptococci. (J. Nutr. 1995;125:1401-12)Phenotype: The outward appearance of the individual. It is the product of interactions between genes, and between the GENOTYPE and the environment.Fusobacterium: A genus of gram-negative, anaerobic, rod-shaped bacteria found in cavities of humans and other animals. No endospores are formed. Some species are pathogenic and occur in various purulent or gangrenous infections.Operon: In bacteria, a group of metabolically related genes, with a common promoter, whose transcription into a single polycistronic MESSENGER RNA is under the control of an OPERATOR REGION.Flavobacterium: A genus of gram-negative, aerobic, rod-shaped bacteria widely distributed in SOIL and WATER. Its organisms are also found in raw meats, MILK and other FOOD, hospital environments, and human clinical specimens. Some species are pathogenic in humans.Actinomycetales: An order of gram-positive, primarily aerobic BACTERIA that tend to form branching filaments.Sodium Chloride: A ubiquitous sodium salt that is commonly used to season food.Gram-Positive Cocci: Coccus-shaped bacteria that retain the crystal violet stain when treated by Gram's method.Environmental Microbiology: The study of microorganisms living in a variety of environments (air, soil, water, etc.) and their pathogenic relationship to other organisms including man.Metagenome: A collective genome representative of the many organisms, primarily microorganisms, existing in a community.Lactobacillaceae: A family of gram-positive bacteria found regularly in the mouth and intestinal tract of man and other animals, in food and dairy products, and in fermenting vegetable juices. A few species are highly pathogenic.Ecosystem: A functional system which includes the organisms of a natural community together with their environment. (McGraw Hill Dictionary of Scientific and Technical Terms, 4th ed)Oxidoreductases: The class of all enzymes catalyzing oxidoreduction reactions. The substrate that is oxidized is regarded as a hydrogen donor. The systematic name is based on donor:acceptor oxidoreductase. The recommended name will be dehydrogenase, wherever this is possible; as an alternative, reductase can be used. Oxidase is only used in cases where O2 is the acceptor. (Enzyme Nomenclature, 1992, p9)Salmonella: A genus of gram-negative, facultatively anaerobic, rod-shaped bacteria that utilizes citrate as a sole carbon source. It is pathogenic for humans, causing enteric fevers, gastroenteritis, and bacteremia. Food poisoning is the most common clinical manifestation. Organisms within this genus are separated on the basis of antigenic characteristics, sugar fermentation patterns, and bacteriophage susceptibility.PeptidoglycanSulfur: An element that is a member of the chalcogen family. It has an atomic symbol S, atomic number 16, and atomic weight [32.059; 32.076]. It is found in the amino acids cysteine and methionine.Methane: The simplest saturated hydrocarbon. It is a colorless, flammable gas, slightly soluble in water. It is one of the chief constituents of natural gas and is formed in the decomposition of organic matter. (Grant & Hackh's Chemical Dictionary, 5th ed)Anti-Infective Agents: Substances that prevent infectious agents or organisms from spreading or kill infectious agents in order to prevent the spread of infection.Quorum Sensing: A phenomenon where microorganisms communicate and coordinate their behavior by the accumulation of signaling molecules. A reaction occurs when a substance accumulates to a sufficient concentration. This is most commonly seen in bacteria.Staphylococcus: A genus of gram-positive, facultatively anaerobic, coccoid bacteria. Its organisms occur singly, in pairs, and in tetrads and characteristically divide in more than one plane to form irregular clusters. Natural populations of Staphylococcus are found on the skin and mucous membranes of warm-blooded animals. Some species are opportunistic pathogens of humans and animals.Pseudoalteromonas: A genus of GRAM-NEGATIVE AEROBIC BACTERIA of marine origin. Many species were formerly classified under ALTEROMONAS.Biodiversity: The variety of all native living organisms and their various forms and interrelationships.Microscopy, Electron: Microscopy using an electron beam, instead of light, to visualize the sample, thereby allowing much greater magnification. The interactions of ELECTRONS with specimens are used to provide information about the fine structure of that specimen. In TRANSMISSION ELECTRON MICROSCOPY the reactions of the electrons that are transmitted through the specimen are imaged. In SCANNING ELECTRON MICROSCOPY an electron beam falls at a non-normal angle on the specimen and the image is derived from the reactions occurring above the plane of the specimen.Bacteroidaceae: A family of gram-negative bacteria found primarily in the intestinal tracts and mucous membranes of warm-blooded animals. Its organisms are sometimes pathogenic.Nitrogen Fixation: The process in certain BACTERIA; FUNGI; and CYANOBACTERIA converting free atmospheric NITROGEN to biologically usable forms of nitrogen, such as AMMONIA; NITRATES; and amino compounds.Waste Disposal, Fluid: The discarding or destroying of liquid waste products or their transformation into something useful or innocuous.Bifidobacterium: A rod-shaped, gram-positive, non-acid-fast, non-spore-forming, non-motile bacterium that is a genus of the family Bifidobacteriaceae, order Bifidobacteriales, class ACTINOBACTERIA. It inhabits the intestines and feces of humans as well as the human vagina.Marine Biology: The study of the origin, structure, development, growth, function, genetics, and reproduction of organisms which inhabit the OCEANS AND SEAS.Microscopy, Electron, Scanning: Microscopy in which the object is examined directly by an electron beam scanning the specimen point-by-point. The image is constructed by detecting the products of specimen interactions that are projected above the plane of the sample, such as backscattered electrons. Although SCANNING TRANSMISSION ELECTRON MICROSCOPY also scans the specimen point by point with the electron beam, the image is constructed by detecting the electrons, or their interaction products that are transmitted through the sample plane, so that is a form of TRANSMISSION ELECTRON MICROSCOPY.Nucleic Acid Hybridization: Widely used technique which exploits the ability of complementary sequences in single-stranded DNAs or RNAs to pair with each other to form a double helix. Hybridization can take place between two complimentary DNA sequences, between a single-stranded DNA and a complementary RNA, or between two RNA sequences. The technique is used to detect and isolate specific sequences, measure homology, or define other characteristics of one or both strands. (Kendrew, Encyclopedia of Molecular Biology, 1994, p503)Hot Temperature: Presence of warmth or heat or a temperature notably higher than an accustomed norm.Virulence Factors: Those components of an organism that determine its capacity to cause disease but are not required for its viability per se. Two classes have been characterized: TOXINS, BIOLOGICAL and surface adhesion molecules that effect the ability of the microorganism to invade and colonize a host. (From Davis et al., Microbiology, 4th ed. p486)Lipopolysaccharides: Lipid-containing polysaccharides which are endotoxins and important group-specific antigens. They are often derived from the cell wall of gram-negative bacteria and induce immunoglobulin secretion. The lipopolysaccharide molecule consists of three parts: LIPID A, core polysaccharide, and O-specific chains (O ANTIGENS). When derived from Escherichia coli, lipopolysaccharides serve as polyclonal B-cell mitogens commonly used in laboratory immunology. (From Dorland, 28th ed)Pseudomonas fluorescens: A species of nonpathogenic fluorescent bacteria found in feces, sewage, soil, and water, and which liquefy gelatin.Enterococcus faecalis: A species of gram-positive, coccoid bacteria commonly isolated from clinical specimens and the human intestinal tract. Most strains are nonhemolytic.Peptostreptococcus: A genus of gram-positive, anaerobic, coccoid bacteria that is part of the normal flora of humans. Its organisms are opportunistic pathogens causing bacteremias and soft tissue infections.Host-Pathogen Interactions: The interactions between a host and a pathogen, usually resulting in disease.Gram-Negative Chemolithotrophic Bacteria: A large group of bacteria including those which oxidize ammonia or nitrite, metabolize sulfur and sulfur compounds, or deposit iron and/or manganese oxides.Flagella: A whiplike motility appendage present on the surface cells. Prokaryote flagella are composed of a protein called FLAGELLIN. Bacteria can have a single flagellum, a tuft at one pole, or multiple flagella covering the entire surface. In eukaryotes, flagella are threadlike protoplasmic extensions used to propel flagellates and sperm. Flagella have the same basic structure as CILIA but are longer in proportion to the cell bearing them and present in much smaller numbers. (From King & Stansfield, A Dictionary of Genetics, 4th ed)Enterobacter: Gram-negative gas-producing rods found in feces of humans and other animals, sewage, soil, water, and dairy products.Antigens, Bacterial: Substances elaborated by bacteria that have antigenic activity.Ammonia: A colorless alkaline gas. It is formed in the body during decomposition of organic materials during a large number of metabolically important reactions. Note that the aqueous form of ammonia is referred to as AMMONIUM HYDROXIDE.Kinetics: The rate dynamics in chemical or physical systems.Fimbriae, Bacterial: Thin, hairlike appendages, 1 to 20 microns in length and often occurring in large numbers, present on the cells of gram-negative bacteria, particularly Enterobacteriaceae and Neisseria. Unlike flagella, they do not possess motility, but being protein (pilin) in nature, they possess antigenic and hemagglutinating properties. They are of medical importance because some fimbriae mediate the attachment of bacteria to cells via adhesins (ADHESINS, BACTERIAL). Bacterial fimbriae refer to common pili, to be distinguished from the preferred use of "pili", which is confined to sex pili (PILI, SEX).Burkholderia: A genus of gram-negative, aerobic, rod-shaped bacteria. Organisms in this genus had originally been classified as members of the PSEUDOMONAS genus but overwhelming biochemical and chemical findings indicated the need to separate them from other Pseudomonas species, and hence, this new genus was created.Gram-Positive Endospore-Forming Bacteria: Bacteria that form endospores and are gram-positive. Representative genera include BACILLUS; CLOSTRIDIUM; MICROMONOSPORA; SACCHAROPOLYSPORA; and STREPTOMYCES.Cluster Analysis: A set of statistical methods used to group variables or observations into strongly inter-related subgroups. In epidemiology, it may be used to analyze a closely grouped series of events or cases of disease or other health-related phenomenon with well-defined distribution patterns in relation to time or place or both.Microbial Interactions: The inter- and intra-relationships between various microorganisms. This can include both positive (like SYMBIOSIS) and negative (like ANTIBIOSIS) interactions. Examples include virus - bacteria and bacteria - bacteria.Rumen: The first stomach of ruminants. It lies on the left side of the body, occupying the whole of the left side of the abdomen and even stretching across the median plane of the body to the right side. It is capacious, divided into an upper and a lower sac, each of which has a blind sac at its posterior extremity. The rumen is lined by mucous membrane containing no digestive glands, but mucus-secreting glands are present in large numbers. Coarse, partially chewed food is stored and churned in the rumen until the animal finds circumstances convenient for rumination. When this occurs, little balls of food are regurgitated through the esophagus into the mouth, and are subjected to a second more thorough mastication, swallowed, and passed on into other parts of the compound stomach. (From Black's Veterinary Dictionary, 17th ed)Sulfates: Inorganic salts of sulfuric acid.Photobacterium: A genus of gram-negative, facultatively anaerobic, rod-shaped bacteria that are common in the marine environment and on the surfaces and in the intestinal contents of marine animals. Some species are bioluminescent and are found as symbionts in specialized luminous organs of fish.Pigments, Biological: Any normal or abnormal coloring matter in PLANTS; ANIMALS or micro-organisms.PhenazinesActinomyces: A genus of gram-positive, rod-shaped bacteria whose organisms are nonmotile. Filaments that may be present in certain species are either straight or wavy and may have swollen or clubbed heads.Carbohydrate Metabolism: Cellular processes in biosynthesis (anabolism) and degradation (catabolism) of CARBOHYDRATES.Polysaccharides, Bacterial: Polysaccharides found in bacteria and in capsules thereof.Carbon: A nonmetallic element with atomic symbol C, atomic number 6, and atomic weight [12.0096; 12.0116]. It may occur as several different allotropes including DIAMOND; CHARCOAL; and GRAPHITE; and as SOOT from incompletely burned fuel.Sequence Homology, Nucleic Acid: The sequential correspondence of nucleotides in one nucleic acid molecule with those of another nucleic acid molecule. Sequence homology is an indication of the genetic relatedness of different organisms and gene function.Micrococcus: A genus of gram-positive, spherical bacteria found in soils and fresh water, and frequently on the skin of man and other animals.Models, Biological: Theoretical representations that simulate the behavior or activity of biological processes or diseases. For disease models in living animals, DISEASE MODELS, ANIMAL is available. Biological models include the use of mathematical equations, computers, and other electronic equipment.DNA Primers: Short sequences (generally about 10 base pairs) of DNA that are complementary to sequences of messenger RNA and allow reverse transcriptases to start copying the adjacent sequences of mRNA. Primers are used extensively in genetic and molecular biology techniques.Proteus: A genus of gram-negative, facultatively anaerobic, rod-shaped bacteria that occurs in the intestines of humans and a wide variety of animals, as well as in manure, soil, and polluted waters. Its species are pathogenic, causing urinary tract infections and are also considered secondary invaders, causing septic lesions at other sites of the body.Eukaryota: One of the three domains of life (the others being BACTERIA and ARCHAEA), also called Eukarya. These are organisms whose cells are enclosed in membranes and possess a nucleus. They comprise almost all multicellular and many unicellular organisms, and are traditionally divided into groups (sometimes called kingdoms) including ANIMALS; PLANTS; FUNGI; and various algae and other taxa that were previously part of the old kingdom Protista.Bioreactors: Tools or devices for generating products using the synthetic or chemical conversion capacity of a biological system. They can be classical fermentors, cell culture perfusion systems, or enzyme bioreactors. For production of proteins or enzymes, recombinant microorganisms such as bacteria, mammalian cells, or insect or plant cells are usually chosen.Sulfides: Chemical groups containing the covalent sulfur bonds -S-. The sulfur atom can be bound to inorganic or organic moieties.Petroleum: Naturally occurring complex liquid hydrocarbons which, after distillation, yield combustible fuels, petrochemicals, and lubricants.Evolution, Molecular: The process of cumulative change at the level of DNA; RNA; and PROTEINS, over successive generations.Desulfovibrio: A genus of gram-negative, anaerobic, rod-shaped bacteria capable of reducing sulfur compounds to hydrogen sulfide. Organisms are isolated from anaerobic mud of fresh and salt water, animal intestines, manure, and feces.Serratia marcescens: A species of gram-negative, facultatively anaerobic, rod-shaped bacteria found in soil, water, food, and clinical specimens. It is a prominent opportunistic pathogen for hospitalized patients.Rhizobium: A genus of gram-negative, aerobic, rod-shaped bacteria that activate PLANT ROOT NODULATION in leguminous plants. Members of this genus are nitrogen-fixing and common soil inhabitants.Gentian Violet: A dye that is a mixture of violet rosanilinis with antibacterial, antifungal, and anthelmintic properties.Germ-Free Life: Animals not contaminated by or associated with any foreign organisms.Multigene Family: A set of genes descended by duplication and variation from some ancestral gene. Such genes may be clustered together on the same chromosome or dispersed on different chromosomes. Examples of multigene families include those that encode the hemoglobins, immunoglobulins, histocompatibility antigens, actins, tubulins, keratins, collagens, heat shock proteins, salivary glue proteins, chorion proteins, cuticle proteins, yolk proteins, and phaseolins, as well as histones, ribosomal RNA, and transfer RNA genes. The latter three are examples of reiterated genes, where hundreds of identical genes are present in a tandem array. (King & Stanfield, A Dictionary of Genetics, 4th ed)Chromosomes, Bacterial: Structures within the nucleus of bacterial cells consisting of or containing DNA, which carry genetic information essential to the cell.Dental Plaque: A film that attaches to teeth, often causing DENTAL CARIES and GINGIVITIS. It is composed of MUCINS, secreted from salivary glands, and microorganisms.Antibodies, Bacterial: Immunoglobulins produced in a response to BACTERIAL ANTIGENS.Models, Molecular: Models used experimentally or theoretically to study molecular shape, electronic properties, or interactions; includes analogous molecules, computer-generated graphics, and mechanical structures.Bacteriochlorophylls: Pyrrole containing pigments found in photosynthetic bacteria.Alcaligenes: A genus of gram-negative, aerobic, motile bacteria that occur in water and soil. Some are common inhabitants of the intestinal tract of vertebrates. These bacteria occasionally cause opportunistic infections in humans.Bacteriophages: Viruses whose hosts are bacterial cells.Thiosulfates: Inorganic salts of thiosulfuric acid possessing the general formula R2S2O3.Microscopy, Electron, Transmission: Electron microscopy in which the ELECTRONS or their reaction products that pass down through the specimen are imaged below the plane of the specimen.Plankton: Community of tiny aquatic PLANTS and ANIMALS, and photosynthetic BACTERIA, that are either free-floating or suspended in the water, with little or no power of locomotion. They are divided into PHYTOPLANKTON and ZOOPLANKTON.Adhesins, Bacterial: Cell-surface components or appendages of bacteria that facilitate adhesion (BACTERIAL ADHESION) to other cells or to inanimate surfaces. Most fimbriae (FIMBRIAE, BACTERIAL) of gram-negative bacteria function as adhesins, but in many cases it is a minor subunit protein at the tip of the fimbriae that is the actual adhesin. In gram-positive bacteria, a protein or polysaccharide surface layer serves as the specific adhesin. What is sometimes called polymeric adhesin (BIOFILMS) is distinct from protein adhesin.Klebsiella pneumoniae: Gram-negative, non-motile, capsulated, gas-producing rods found widely in nature and associated with urinary and respiratory infections in humans.Pseudomonas putida: A species of gram-negative, aerobic bacteria isolated from soil and water as well as clinical specimens. Occasionally it is an opportunistic pathogen.Nitrosomonas: A genus of gram-negative, ellipsoidal or rod-shaped bacteria whose major source of energy and reducing power is from the oxidation of ammonia to nitrite. Its species occur in soils, oceans, lakes, rivers, and sewage disposal systems.Time Factors: Elements of limited time intervals, contributing to particular results or situations.Lactobacillales: An order of gram-positive bacteria in the class Bacilli, that have the ability to ferment sugars to lactic acid. They are widespread in nature and commonly used to produce fermented foods.Rhodopseudomonas: A genus of gram-negative, rod-shaped, phototrophic bacteria found in aquatic environments. Internal photosynthetic membranes are present as lamellae underlying the cytoplasmic membrane.Genetic Complementation Test: A test used to determine whether or not complementation (compensation in the form of dominance) will occur in a cell with a given mutant phenotype when another mutant genome, encoding the same mutant phenotype, is introduced into that cell.Lactobacillus acidophilus: A species of gram-positive, rod-shaped bacteria isolated from the intestinal tract of humans and animals, the human mouth, and vagina. This organism produces the fermented product, acidophilus milk.Methylococcaceae: A family of gram-negative, aerobic bacteria utilizing only one-carbon organic compounds and isolated from in soil and water.Arthrobacter: A genus of asporogenous bacteria isolated from soil that displays a distinctive rod-coccus growth cycle.Klebsiella: A genus of gram-negative, facultatively anaerobic, rod-shaped bacteria whose organisms arrange singly, in pairs, or short chains. This genus is commonly found in the intestinal tract and is an opportunistic pathogen that can give rise to bacteremia, pneumonia, urinary tract and several other types of human infection.Acetobacteraceae: A family of gram-negative aerobic bacteria consisting of ellipsoidal to rod-shaped cells that occur singly, in pairs, or in chains.Industrial Waste: Worthless, damaged, defective, superfluous or effluent material from industrial operations.Streptococcus mutans: A polysaccharide-producing species of STREPTOCOCCUS isolated from human dental plaque.Antimicrobial Cationic Peptides: Small cationic peptides that are an important component, in most species, of early innate and induced defenses against invading microbes. In animals they are found on mucosal surfaces, within phagocytic granules, and on the surface of the body. They are also found in insects and plants. Among others, this group includes the DEFENSINS, protegrins, tachyplesins, and thionins. They displace DIVALENT CATIONS from phosphate groups of MEMBRANE LIPIDS leading to disruption of the membrane.Macrophages: The relatively long-lived phagocytic cell of mammalian tissues that are derived from blood MONOCYTES. Main types are PERITONEAL MACROPHAGES; ALVEOLAR MACROPHAGES; HISTIOCYTES; KUPFFER CELLS of the liver; and OSTEOCLASTS. They may further differentiate within chronic inflammatory lesions to EPITHELIOID CELLS or may fuse to form FOREIGN BODY GIANT CELLS or LANGHANS GIANT CELLS. (from The Dictionary of Cell Biology, Lackie and Dow, 3rd ed.)Denaturing Gradient Gel Electrophoresis: Electrophoresis in which various denaturant gradients are used to induce nucleic acids to melt at various stages resulting in separation of molecules based on small sequence differences including SNPs. The denaturants used include heat, formamide, and urea.Antarctic Regions: The continent lying around the South Pole and the southern waters of the Atlantic, Pacific, and Indian Oceans. It includes the Falkland Islands Dependencies. (From Webster's New Geographical Dictionary, 1988, p55)Blood Bactericidal Activity: The natural bactericidal property of BLOOD due to normally occurring antibacterial substances such as beta lysin, leukin, etc. This activity needs to be distinguished from the bactericidal activity contained in a patient's serum as a result of antimicrobial therapy, which is measured by a SERUM BACTERICIDAL TEST.Cellulose: A polysaccharide with glucose units linked as in CELLOBIOSE. It is the chief constituent of plant fibers, cotton being the purest natural form of the substance. As a raw material, it forms the basis for many derivatives used in chromatography, ion exchange materials, explosives manufacturing, and pharmaceutical preparations.
Full text of "Pathogenic Bacteria"Full text of "Pathogenic Bacteria" See other formats CUL 77 VA TION OF BACTERIA. 129 micro-organism accidentally enter, the ...
archive.org/stream/PathogenicBacteria/TXT/0000 - 0125.txt
Bacteria stock photo 137157996 | iStockDownload this Bacteria photo now. And search more of the web's best library of royalty-free stock images from iStock. ...
bacteria - Everything2.comBacteria are the fundamental units of life. They are prokaryotes, meaning they do not have a nucleus ('pro' meaning 'first'). ... Not all bacteria are benign, though. Bacteria cause many kinds of disease. Bacteria that cause disease are called pathogens. We ... bacteria rights. bacterium. Why is nasal mucus green?. glycerol stock. How many different species live on or in the average ... The bacteria that cause food spoilage are of this form. The bacteria leave toxins in the food that can damage or kill human ...
nitrogen-fixing bacteria | biology | Britannica.comnitrogen-fixing bacteria: Microorganisms capable of transforming atmospheric nitrogen into fixed nitrogen (inorganic compounds ... Two kinds of nitrogen-fixing bacteria are recognized. The first kind, the free-living (nonsymbiotic) bacteria, includes the ... enlargements of plant cells and bacteria in intimate association. Within the nodules the bacteria convert free nitrogen to ... Bacteria, Mold, and Lichen: Fact or Fiction?. Take this Science True or False Quiz at Encyclopedia Britannica to test your ...
Bacteria Feed on Earth's Crust - RedorbitSeafloor bacteria on ocean-bottom rocks are more abundant and diverse than previously thought, appearing to "feed" on the ... This discovery lends support to the idea that bacteria survive on energy from Earth's crust, a process that could add to our ... Using genetic analyses, Cara Santelli of WHOI, Katrina Edwards of USC, and colleagues found three to four times more bacteria ... With evidence that the oceanic crust supports more bacteria than overlying water, the scientists hypothesized that reactions ...
Gut bacteria reflect dietary differences | Science NewsGut bacteria reflect dietary differences. High-fiber, low-fat diets cultivate healthier intestinal microbes, study suggests. ... Animals have bacteria in their guts to help digest their food, train their immune systems and protect them from harmful ... African children who eat a high-fiber diet (and the occasional wood-digesting insect) have gut bacteria that help them digest ... Different types of food encourage different abundances and diversity of bacteria to grow in the gut. ...
bacteria - Biosynthetic pathways of bacteria | Britannica.comBiosynthetic pathways of bacteria: Many prokaryotes are able to convert any given carbon source into biosynthetic building ... Most bacteria can be seen only with a microscope.. bacteria - Student Encyclopedia (Ages 11 and up). The single-celled ... bacteria - Children's Encyclopedia (Ages 8-11). Bacteria are small organisms, or living things, that can be found in all ... Classification of bacteria. Taxonomic rankings. The classification of bacteria has long presented unique challenges in ...
Scientists Create Programmable Bacteria - SlashdotSan Francisco have created bacteria that can be programmed like a computer. Researchers built 'logic gates' - the building ... 1. Create Bacteria. 2. program it. 3. ????. 4. Profit!. In Soviet Russia Bacteria programs YOU!. Think that covers everything. ... Say you could tailor a bacteria to attack or compete with a bacteria which you needed to control. As the target mutates your ... tailor a bacteria to attack or compete with a bacteria which you needed to control ...
Why bacteria 'shapeshift' in space... likely protecting the bacteria even more from the antibiotic, said Zea. The E. coli bacteria grown in space also tended to form ... Why bacteria 'shapeshift' in space. Press Release From: University of Colorado at Boulder Posted: Thursday, September 14, 2017 ... Researchers from CU Boulder's BioServe Space Technologies designed an experiment to culture the common E. coli bacteria on ISS ... "We knew bacteria behave differently in space and that it takes higher concentrations of antibiotics to kill them," said Zea. " ...
Can Good Bacteria Really Fight the Flu? - ABC NewsNow there is strong evidence to suggest that probiotics -- good bacteria that can aid immune function -- can have a preventive ... Friendly Bacteria Help the Immune System. "About 60 to 80 percent of our immune cells are associated with gut [cells]. Hitting ... "Introducing friendly bacteria into the digestive system improves how we absorb vitamins, nutrients and co-factors, so overall, ... New evidence suggests that probiotics -- good bacteria that can aid immune function -- can have a preventive effect for cold ...
Researchers Unlock The Secret Of Bacteria's Immune System - RedorbitA team of Universit© Laval and Danisco researchers has just unlocked the secret of bacteria's immune system. The details of the discovery, which may eventually make it possible to prevent certain bacteria from developing resistance to antibiotics, are presented in today's issue of the scientific journal Nature.. The team led by Professor Sylvain Moineau of Universit© Laval's Department of Biochemistry, Microbiology, and Bioinformatics showed that this mechanism, called CRISPR/Cas, works by selecting foreign DNA segments and inserting them into very specific locations in a bacterium's genome. These segments then serve as a kind of immune factor in fighting off future invasions by cleaving incoming DNA.. The researchers demonstrated this mechanism using plasmids, DNA molecules that are regularly exchanged by bacteria. The plasmid used in the experiment, which contained a gene for antibiotic resistance, was inserted into bacteria used in making ...
The Clinical Impact of Isolation of Two Different Bacteria in Urinary Cultures - Full Text View - ClinicalTrials.govThe purpose of this study is to determine whether identification of two different bacteria in urine culture of patients with indwelling catheter has a clinical impact - change in antibiotic, duration of antibiotic, days to clinical resolution and length of stay in hospital.. The microbiology laboratory will randomized urine cultures with two bacteria from indwelling catheter to either reporting identity and susceptibility of the bacteria or reporting 'mixed growth'. ...
Health and Human Biology: Fighting Bacteria in Biofilms with Antibiotics - A New DiscoveryAntibiotic resistance is a phenomenon in which a bacterium that was once killed by an antibiotic is no longer affected due to a random genetic change. When bacteria without the beneficial genes are killed by an antibiotic, the resistant bacteria have room and resources to multiply. Their helpful genes are passed to their offspring, eventually creating a resistant population. The term "antibiotic resistance" is also used to in another sense, however. It sometimes refers to the difficulty of killing biofilm bacteria with antibiotics ...
Bacterium - The Full WikiIn the laboratory, bacteria are usually grown using solid or liquid media. Solid growth media such as agar plates are used to isolate pure cultures of a bacterial strain. However, liquid growth media are used when measurement of growth or large volumes of cells are required. Growth in stirred liquid media occurs as an even cell suspension, making the cultures easy to divide and transfer, although isolating single bacteria from liquid media is difficult. The use of selective media (media with specific nutrients added or deficient, or with antibiotics added) can help identify specific organisms.. Most laboratory techniques for growing bacteria use high levels of nutrients to produce large amounts of cells cheaply and quickly. However, in natural environments nutrients are limited, meaning that bacteria cannot continue to reproduce indefinitely. This nutrient limitation has led the evolution of different growth strategies ...
ET 12/93: The tooth, the whole tooth, and nothing but the toothAnother area of great concern is periodontal (gum) disease, which affects more than 80 percent of the adult U.S. population. Conventional treatment of gum disease often involves surgical removal of infected tissue. Several studies conducted during the last 10 to 15 years indicate that surgical as well as non-surgical approaches to treat gum disease are of equal value when performed properly. With Bio-compatible dental care, the patient's plaque is evaluated using a phase microscope in a simple and painless procedure to determine the level of bacterial activity. Next, a specific program of non-surgical therapy is prescribed involving both professional treatment in the office and natural home care by the patient. This natural, non-surgical program is less stressful to the body, is very effective and teaches the patient proper oral hygiene for prevention and maintenance of healthy tissue ...
Biology-Online • View topic - Trouble Identifying an Unkown Bacteria.I have been assigned to identify an unknown bacteria for my laboratory class. I have come to the conclusion that the bacteria is among the Alcaligenes family. I have done my research and everything. But I still do not know if the bacteria is the right one. I know my bacteria is among these ...
Impacts on BacteriaHow can humans have an impact on bacteria? We learned in Module 3: Soils that each human is comprised of more bacterial cells than human cells… truly amazing! Does human activity have the ability to change the population within one of us? Can we affect the bacteria that circulate in our environment? There are several ways in which human activity can influence b...
Protrin DF - Uses, Side Effects, Interactions - MedBroadcast.comProtrin DF: Trimethoprim and sulfamethoxazole both belong to the class of medications called antibiotics. This combination of antibiotics is used together to treat infections caused by certain bacteria.
PigProgress - Should future pigs roll in the mud again?Increased hygiene and a lack of exposure to various microorganisms may be affecting the immune systems of many populations - particularly in highly developed countries like the USA -to the degree that individuals are losing their bodily ability to fight off certain diseases.
Among US Children, More Infections Caused By Drug-resistant Bacteria | Science 2.0Infections caused by a concerning type of antibiotic-resistant bacteria are on the rise in U.S. children, according to a new study published in the Journal of the Pediatric Infectious Diseases Society and available online.
Cell Surface Protein Anchoring and Function in Gram-Positive Bacteria - Robert ClubbSurface displayed proteins on bacteria play key roles in pathogenesis as they promote bacterial adhesion to host tissues, acquisition of essential nutrients, ev...
Friendly Bacteria Protect Against Type 1 DiabetesFindings reveal that exposure to some forms of bacteria might help prevent the onset of type 1 diabetes, which is an autoimmune disease.
The eternal battle between bacteria and viruses | Tech TalentsScience Magazine features an article by TU Delft on the CRISPR systems in bacteria and resistance to viruses: The battle between bacteria and viruses!
Bugs may Help Decode the Relationship Between Animals and BacteriaScientists may have come closer to revealing the relationship between animals and bacteria, which may shed light on the association between humans and bacteria for health
'A basis for the future selection of probiotics': Study shows how gut bacteria communicate with host to regulate...Bacteria in the gut may regulate weight gain and serum cholesterol levels by producing proteins that modify bile acids in the intestine, says a new study with implications for probiotics.
Cancer-fighting Nanobots Could be Directed by Whip-tailed BacteriaBacteria injected into blood stream could sound an 'alarm' to nanobots in the body so that they sense tumour cells and release anticancer drugs to fight them, scientists have said.
Intestinal bacteria in disease | Robert ThirskIn today's post, guest blogger and clinician-scientist Philip M. Sherman, MD, FRCPC, Scientific Director of the CIHR Institute of Nutrition, Metabolism and
1 topicThere are hundreds of trillions of friendly (and a handful of unfriendly) organisms in our intestines - it's warm, safe, and there's plenty of food in there, making it a great place for them to call home. We have evolved with these bacteria, and we need them just as much as they need us […]. Read More CANCER - Are your gut bacteria putting you at risk? ...
What are enzymes? Make nature work for you | NovozymesRead more about what enzymes and microbes are and how they can improve the efficiency of production of everyday products while making them more sustainable.
Effective Microorganisms - EMRO USA - TeraGanixEMRO USA is the sole authorized manufacturer of Effective Microorganisms (EM•1 products) in the U.S.--unique Japanese technology solving eco problems from households to industrial
Exogenous bacteria: Exogenous bacteria are microorganisms introduced to closed biological systems from the external world. They exist in aquatic and terrestrial environments, as well as the atmosphere.Multidrug-resistant gram-negative bacteria: MDRGN bacteria is an abbreviation for multidrug resistant gram-negative bacteria. For hospitalized patients, and especially patients in intensive care units, these bacterial infections pose a serious and (as of 2010) rapidly emerging threat.Anaerobacter: Anaerobacter are a genus of Gram-positive bacteria related to Clostridium. They are anaerobic chemotrophs and are unusual spore-formers as they produce more than one spore per bacterial cell (up to five spores).Pasteur point: The Pasteur point is a level of oxygen (about 0.3% by volume which is less than 1% of Present Atmospheric Level or PAL) above which aerobic microorganisms and facultative anaerobes adapt from fermentation to aerobic respiration.Coles PhillipsFerric uptake regulator family: In molecular biology, the ferric uptake regulator (FUR) family of proteins includes metal ion uptake regulator proteins. These are responsible for controlling the intracellular concentration of iron in many bacteria.Branching order of bacterial phyla (Gupta, 2001): There are several models of the Branching order of bacterial phyla, one of these was proposed in 2001 by Gupta based on conserved indels or protein, termed "protein signatures", an alternative approach to molecular phylogeny. Some problematic exceptions and conflicts are present to these conserved indels, however, they are in agreement with several groupings of classes and phyla.List of strains of Escherichia coli: Escherichia coli is a well studied bacterium that was first identified by Theodor Escherich, after whom it was later named.Amplified Ribosomal DNA Restriction Analysis: Amplified rDNA (Ribosomal DNA) Restriction Analysis is the extension of the technique of RFLP (restriction fragment length polymorphism) to the gene encoding the small (16s) ribosomal subunit of bacteria. The technique involves an enzymatic amplification using primers directed at the conserved regions at the ends of the 16s gene, followed by digestion using tetracutter Restriction enzymes.DNA sequencer: A DNA sequencer is a scientific instrument used to automate the DNA sequencing process. Given a sample of DNA, a DNA sequencer is used to determine the order of the four bases: G (guanine), C (cytosine), A (adenine) and T (thymine).Fecal coliform: A fecal coliform (British: faecal coliform) is a facultatively anaerobic, rod-shaped, gram-negative, non-sporulating bacterium. Coliform bacteria generally originate in the intestines of warm-blooded animals.Osiris TherapeuticsGemmatimonadetes: The Gemmatimonadetes are a family of bacteria, given their own phylum (Gemmatimonadetes). This bacterium makes up about 2% of soil bacterial communities and has been identified as one of the top nine phyla found in soils; yet, there are currently only six cultured isolates.BacitracinSulfate-reducing bacteria: Sulfate-reducing bacteria are those bacteria and archaea that can obtain energy by oxidizing organic compounds or molecular hydrogen (H2) while reducing sulfate () to hydrogen sulfide (H2S). In a sense, these organisms "breathe" sulfate rather than oxygen in a form of anaerobic respiration.Transfer-messenger RNA: Transfer-messenger RNA (abbreviated tmRNA, also known as 10Sa RNA and by its genetic name SsrA) is a bacterial RNA molecule with dual tRNA-like and messenger RNA-like properties. The tmRNA forms a ribonucleoprotein complex (tmRNP) together with Small Protein B (SmpB), Elongation Factor Tu (EF-Tu), and ribosomal protein S1.Deep chlorophyll maximum: A deep chlorophyll maximum (DCM) is a subsurface maximum in the concentration of chlorophyll in the ocean or a lake. A DCM is not always present--sometimes there is more chlorophyll at the surface than at any greater depth--but it is a common feature of most aquatic ecosystems.Eagle's minimal essential medium: Eagle's minimal essential medium (EMEM) is a cell culture medium developed by Harry Eagle that can be used to maintain cells in tissue culture.McIntosh and Filde's anaerobic jar: McIntosh and Filde's anaerobic jar is an instrument used in the production of an anaerobic environment. This method of anaerobiosis as others is used to culture bacteria which die or fail to grow in presence of oxygen (anaerobes).Global microbial identifier: The genomic epidemiological database for global identification of microorganisms or global microbial identifier (GMI) is a platform for storing whole genome sequencing (WGS) data of microorganisms, for the identification of relevant genes and for the comparison of genomes to detect and track-and-trace infectious disease outbreaks and emerging pathogens. The database holds two types of information: 1) genomic information of microorganisms, linked to, 2) metadata of those microorganism such as epidemiological details.Symbiosis Center of Health Care: Symbiosis Center of Health Care (SCHC) is an organization under Symbiosis Society which takes care of health of symbiosis family be it student or staff.http://www.BiodegradationGentamicin protection assay: The gentamicin protection assay or survival assay or invasion assay is a method used in microbiology. It is used to quantify the ability of pathogenic bacteria to invade eukaryotic cells.Protein primary structure: The primary structure of a peptide or protein is the linear sequence of its amino acid structural units, and partly comprises its overall biomolecular structure. By convention, the primary structure of a protein is reported starting from the amino-terminal (N) end to the carboxyl-terminal (C) end.Pseudomonas alkanolytica: Pseudomonas alkanolytica is a Gram-negative soil bacterium that produces Coenzyme A. Because this organism is patented,Nakao Y, Kuno M.Symmetry element: A symmetry element is a point of reference about which symmetry operations can take place. In particular, symmetry elements can be centers of inversion, axes of rotation and mirror planes.Bulloo-Bancannia drainage basin: The Bulloo-Bancannia drainage basin is a drainage basin that covers part of western Queensland and New South Wales. It is adjacent to the much larger Lake Eyre basin.Replica plating: 350px|right|thumb|[[Negative selection (artificial selection)|Negative selection through replica plating to screen for ampicillin sensitive colonies]]Alkalimonas: Alkalimonas is a genus in the phylum Proteobacteria (Bacteria).BiofilmExternal bacterial infection (fish): External bacterial infection is a condition found in fish.Lactic acid fermentationNankai Trough gas hydrate site: Nankai Methane Hydrate Site (or Japanese Methane Hydrate R&D Program at Nankai, Nankai Trough Methane Hydrate Site) is located in the Nankai Trough, Japan.Zetaproteobacteria: The class Zetaproteobacteria is the sixth and most recently described class of the Proteobacteria. Zetaproteobacteria can also refer to the group of organisms assigned to this class.Obligate aerobe: 300px|thumb|Aerobic and anaerobic [[bacteria can be identified by growing them in test tubes of thioglycollate broth: 1: Obligate aerobes need oxygen because they cannot ferment or respire anaerobically. They gather at the top of the tube where the oxygen concentration is highest.GyrA RNA motif: The gyrA RNA motif is a conserved RNA structure identified by bioinformatics. The RNAs are present in multiple species of bacteria within the order Pseudomonadales.SaPI: SaPIs (Staphylococcus aureus or superantigen pathogenicity islands) are a family of mobile genetic elements resident in the genome of some strains of Staphylococcus aureus. Much like bacteriophages, SaPIs can be transferred to uninfected cells and integrate into the host chromosome.Candidatus Accumulibacter: Candidatus Accumulibacter is an unclassified group of Betaproteobacteria that currently contains only a single member, Candidatus Accumulibacter Phosphatis. C.Vibrio campbellii: Vibrio campbellii is a Gram-negative, curved rod-shaped, marine bacterium closely related to its sister species, Vibrio harveyi. It is an emerging pathogen in aquatic organisms.Streptococcus dysgalactiae: Streptococcus dysgalactiae is a species of Streptococcus.Cytophaga: Cytophaga is a genus of Gram-negative, gliding, rod-shaped bacteria.Virulence: Virulence is, by MeSH definition, the degree of pathogenicity within a group or species of parasites as indicated by case fatality rates and/or the ability of the organism to invade the tissues of the host. The pathogenicity of an organism - its ability to cause disease - is determined by its virulence factors.Alkaliphile: Alkaliphiles are a class of extremophilic microbes capable of survival in alkaline (pH roughly 8.5-11) environments, growing optimally around a pH of 10.Heptadecanoic acidBacillus alcalophilus: Bacillus alcalophilus is a Gram-positive, rod-shaped species of bacteria. Likely strains of this species have been isolated from highly alkaline waste water.Permissive temperature: The permissive temperature is the temperature at which a temperature sensitive mutant gene product takes on a normal, functional phenotype.http://www.Ligation-independent cloning: Ligation-independent cloning (LIC) is a form of molecular cloning that is able to be performed without the use of restriction endonucleases or DNA ligase. This allows genes that have restriction sites to be cloned without worry of chopping up the insert.Thermal cyclerTriparental mating: Triparental mating is a form of Bacterial conjugation where a conjugative plasmid present in one bacterial strain assists the transfer of a mobilizable plasmid present in a second bacterial strain into a third bacterial strain. Plasmids are introduced into bacteria for such purposes as transformation, cloning, or transposon mutagenesis.Table of standard reduction potentials for half-reactions important in biochemistry: The values below are standard reduction potentials for half-reactions measured at 25°C, 1 atmosphere and a pH of 7 in aqueous solution.Domain (biology): In biological taxonomy, a domain (also superregnum, superkingdom, empire, or regio) is the highest taxonomic rank of organisms in the three-domain system of taxonomy designed by Carl Woese, an American microbiologist and biophysicist. According to the Woese system, introduced in 1990, the tree of life consists of three domains: Archaea (a term which Woese created), Bacteria, and Eukaryota.Silent mutation: Silent mutations are mutations in DNA that do not significantly alter the phenotype of the organism in which they occur. Silent mutations can occur in non-coding regions (outside of genes or within introns), or they may occur within exons.Marine fungi: Marine fungi are species of fungi that live in marine or estuarine environments. They are not a taxonomic group but share a common habitat.Gram-negative bacterial infection: Gram-negative bacterial infection refers to a disease caused by gram-negative bacteria. One example is E.Clostridium phytofermentans: Clostridium phytofermentans is an obligately anaerobic, rod-shaped, gram-positive bacterium. It forms spherical spores.Eubacterium oxidoreducens: Eubacterium oxidoreducens is a Gram positive bacterium species in the genus Eubacterium.Sporulation in Bacillus subtilis: Bacillus subtilis is a rod-shaped, Gram-positive bacteria that is naturally found in soil and vegetation, and is known for its ability to form a small, tough, protective and metabolically dormant endospore. B.Adlercreutzia: Adlercreutzia is a genus in the phylum Actinobacteria (Bacteria).Bacterial outer membraneCorynebacterium amycolatum: Corynebacterium amycolatum is a Gram-positive, nonspore-forming, aerobic or facultatively anaerobic bacillus capable of fermentation with propionic acid as the major end product of its glucose metabolism. One of its best known relatives is Corynebacterium diphtheriae, the causative agent of diphtheria.CS-BLASTPhagocytosis: In cell biology, phagocytosis ( (phagein) |to devour||, (kytos) |cell||-osis|process}}) is the process by which a cell—often a phagocyte or a protist—engulfs a solid particle to form an internal vesicle known as a phagosome. Phagocytosis was first noted by Canadian physician William Osler, and later studied by Élie Metchnikoff.Desulfococcus oleovorans Strain Hxd3: Desulfococcus oleovorans Strain Hxd3 was isolated from the saline water phase of an oil-water separator from a northern German oil field.Aeckersberg, F.Listeria monocytogenes: Listeria monocytogenes is the bacterium that causes the infection listeriosis. It is a facultative anaerobic bacterium, capable of surviving in the presence or absence of oxygen.Cell envelope: The cell envelope comprises the inner cell membrane and the cell wall of a bacterium, if present, plus a bacterial outer membrane, if one is present (i.e.Alkaliflexus: Alkaliflexus is a genus in the phylum Bacteroidetes (Bacteria).Horizontal gene transfer in evolutionHeliobacteria: The heliobacteria are phototrophic: they convert light energy into chemical energy by photosynthesis and they use a Type I reaction centerHeinickel and Golbeck 2007. The primary pigment involved is bacteriochlorophyll g, which is unique to the group and has a unique absorption spectrum; this gives the heliobacteria their own environmental niche.Resistome: The resistome is a proposed expression by Gerard D. Wright for the collection of all the antibiotic resistance genes and their precursors in both pathogenic and non-pathogenic bacteria.High-speed door: High-speed doors are door systems, mainly used in industrial applications. They are technical enhancements of the generally known sectional doors, PVC fabric doors or roller shutters.Mutaflor: Mutaflor is a probiotic consisting of a viable non-pathogenic bacteria strain named Escherichia coli Nissle 1917.Mutaflor Information page "The Escherichia coli strain Nissle 1917-designated DSM 6601 in the German Collection for Microorganisms in Braunschweig is one of the best-examined and therapeutically relevant bacterial strains worldwide" as claimed by the manufacturerManufacturers WebsitePhenotype microarray: The phenotype microarray approach is a technology for high-throughput phenotyping of cells.Fusobacterium: Fusobacterium is a genus of anaerobic, Gram-negative bacteria, similar to Bacteroides. Individual cells are rod-shaped bacilli with pointed ends.
(1/19400) Tobramycin, amikacin, sissomicin, and gentamicin resistant Gram-negative rods.
Sensitivities to gentamicin, sissomicin, tobramycin, and amikacin were compared in 196 gentamicin-resistant Gram-negative rods and in 212 similar organisms sensitive to gentamicin, mainly isolated from clinical specimens. Amikacin was the aminoglycoside most active against gentamicin-resistant organisms, Pseudomonas aeruginosa, klebsiella spp, Escherichia coli, Proteus spp, Providencia spp, and Citrobacter spp being particularly susceptible. Most of the gentamicin-resistant organisms were isolated from the urine of patients undergoing surgery. Gentamicin was the most active antibiotic against gentamicin-sensitive E coli, Proteus mirabilis, and Serratia spp. Pseudomonas aeruginosa and other Pseudomonas spp were most susceptible to tobramycin. (+info)
(2/19400) Automated food microbiology: potential for the hydrophobic grid-membrane filter.
Bacterial counts obtained on hydrophobic grid-membrane filters were comparable to conventional plate counts for Pseudomonas aeruginosa, Escherichia coli, and Staphylococcus aureus in homogenates from a range of foods. The wide numerical operating range of the hydrophobic grid-membrane filters allowed sequential diluting to be reduced or even eliminated, making them attractive as components in automated systems of analysis. Food debris could be rinsed completely from the unincubated hydrophobic grid-membrane filter surface without affecting the subsequent count, thus eliminating the possibility of counting food particles, a common source of error in electronic counting systems. (+info)
(3/19400) Anopheles gambiae Ag-STAT, a new insect member of the STAT family, is activated in response to bacterial infection.
A new insect member of the STAT family of transcription factors (Ag-STAT) has been cloned from the human malaria vector Anopheles gambiae. The domain involved in DNA interaction and the SH2 domain are well conserved. Ag-STAT is most similar to Drosophila D-STAT and to vertebrate STATs 5 and 6, constituting a proposed ancient class A of the STAT family. The mRNA is expressed at all developmental stages, and the protein is present in hemocytes, pericardial cells, midgut, skeletal muscle and fat body cells. There is no evidence of transcriptional activation following bacterial challenge. However, bacterial challenge results in nuclear translocation of Ag-STAT protein in fat body cells and induction of DNA-binding activity that recognizes a STAT target site. In vitro treatment with pervanadate (vanadate and H2O2) translocates Ag-STAT to the nucleus in midgut epithelial cells. This is the first evidence of direct participation of the STAT pathway in immune responses in insects. (+info)
(4/19400) Desulfocella halophila gen. nov., sp. nov., a halophilic, fatty-acid-oxidizing, sulfate-reducing bacterium isolated from sediments of the Great Salt Lake.
A new halophilic sulfate-reducing bacterium, strain GSL-But2T, was isolated from surface sediment of the Southern arm of the Great Salt Lake, UT, USA. The organism grew with a number of straight-chain fatty acids (C4-C16), 2-methylbutyrate, L-alanine and pyruvate as electron donors. Butyrate was oxidized incompletely to acetate. Sulfate, but not sulfite or thiosulfate, served as an electron acceptor. Growth was observed between 2 and 19% (w/v) NaCl with an optimum at 4-5% (w/v) NaCl. The optimal temperature and pH for growth were around 34 degrees C and pH 6.5-7.3, respectively. The generation time under optimal conditions in defined medium was around 28 h, compared to 20 h in complex medium containing yeast extract. The G+C content was 35.0 mol%. 16S rRNA gene sequence analysis revealed that strain GSL-But2T belongs to the family Desulfobacteriaceae within the delta-subclass of the Proteobacteria and suggested that strain GSL-But2T represents a member of a new genus. The name Desulfocella halophila gen. nov., sp. nov. is proposed for this organism. The type strain of D. halophila is strain GSL-But2T (= DSM 11763T = ATCC 700426T). (+info)
(5/19400) The influence of a diet rich in wheat fibre on the human faecal flora.
The effect on the faecal flora of adding wheat fibre to a controlled diet in four healthy volunteers for a 3-week period has been observed. No change in the concentration of the bacteria in the bacterial groups counted was found, although there was a slight increase in total output associated with increased faecal weight. The predominant organisms in all subjects were non-sporing anaerobes, but the dominant species in each subject was different and was unaffected by changing the diet. Similarly, the concentration of faecal beta-glucuronidase detected in two subjects was unaltered and the concentration of clostridia able to dehydrogenate the steroid nucleus found in one subject was unaltered. It is suggested that the faecal microflora is not primarily controlled by the presence of undigested food residues in the large bowel. (+info)
(6/19400) In vitro activities of aminomethyl-substituted analogs of novel tetrahydrofuranyl carbapenems.
CL 188,624, CL 190,294, and CL 191,121 are novel aminomethyl tetrahydrofuranyl (THF)-1 beta-methylcarbapenems. The in vitro antibacterial activities of these THF carbapenems were evaluated and compared with those of biapenem, imipenem, and meropenem against 554 recent clinical isolates obtained from geographically distinct medical centers across North America. The antibacterial activities of the THF carbapenems were equivalent to that of biapenem, and the THF carbapenems were slightly more active than imipenem and less active than meropenem against most of the members of the family Enterobacteriaceae but lacked significant activity against Pseudomonas isolates. In general, CL 191,121 was two- to fourfold more active than CL 188,624 and CL 190,294 against the staphylococcal and enterococcal isolates tested. CL 191,121 was twofold less active than imipenem against methicillin-susceptible staphylococci and was as activity as imipenem against Enterococcus faecalis isolates. Biapenem and meropenem were two- and fourfold less active than CL 191,121, respectively, against the methicillin-susceptible staphylococci and E. faecalis. All the carbapenems displayed equivalent good activities against the streptococci. Biapenem was slightly more active than the other carbapenems against Bacteroides fragilis isolates. Time-kill curve studies demonstrated that the THF carbapenems were bactericidal in 6 h against Escherichia coli and Staphylococcus aureus isolates. The postantibiotic effect exerted by CL 191,121 was comparable to or slightly longer than that of imipenem against isolates of S. aureus, E. coli, and Klebsiella pneumoniae. (+info)
(7/19400) Antimicrobial activities of synthetic bismuth compounds against Clostridium difficile.
Clostridium difficile is a major nosocomial pathogen responsible for pseudomembranous colitis and many cases of antibiotic-associated diarrhea. Because of potential relapse of disease with current antimicrobial therapy protocols, there is a need for additional and/or alternative antimicrobial agents for the treatment of disease caused by C. difficile. We have synthesized a systematic series of 14 structurally simple bismuth compounds and assessed their biological activities against C. difficile and four other gastrointestinal species, including Helicobacter pylori. Here, we report on the activities of six compounds that exhibit antibacterial activities against C. difficile, and some of the compounds have MICs of less than 1 microgram/ml. Also tested, for comparison, were the activities of bismuth subcitrate and ranitidine bismuth citrate obtained from commercial sources. C. difficile and H. pylori were more sensitive both to the synthetic bismuth compounds and to the commercial products than were Escherichia coli, Pseudomonas aeruginosa, and Proteus mirabilis, and the last three species were markedly resistant to the commercial bismuth salts. Testing with human foreskin fibroblast cells revealed that some of the synthetic compounds were more cytotoxic than others. Killing curves for C. difficile treated with the more active compounds revealed rapid death, and electron microscopy showed that the bismuth of these compounds was rapidly incorporated by C. difficile. Energy dispersive spectroscopy X-ray microanalysis of C. difficile cells containing electron-dense material confirmed the presence of internalized bismuth. Internalized bismuth was not observed in C. difficile treated with synthetic bismuth compounds that lacked antimicrobial activity, which suggests that the uptake of the metal is required for killing activity. The nature of the carrier would seem to determine whether bismuth is transported into susceptible bacteria like C. difficile. (+info)
(8/19400) 3-Hydroxylaminophenol mutase from Ralstonia eutropha JMP134 catalyzes a Bamberger rearrangement.
3-Hydroxylaminophenol mutase from Ralstonia eutropha JMP134 is involved in the degradative pathway of 3-nitrophenol, in which it catalyzes the conversion of 3-hydroxylaminophenol to aminohydroquinone. To show that the reaction was really catalyzed by a single enzyme without the release of intermediates, the corresponding protein was purified to apparent homogeneity from an extract of cells grown on 3-nitrophenol as the nitrogen source and succinate as the carbon and energy source. 3-Hydroxylaminophenol mutase appears to be a relatively hydrophobic but soluble and colorless protein consisting of a single 62-kDa polypeptide. The pI was determined to be at pH 4.5. In a database search, the NH2-terminal amino acid sequence of the undigested protein and of two internal sequences of 3-hydroxylaminophenol mutase were found to be most similar to those of glutamine synthetases from different species. Hydroxylaminobenzene, 4-hydroxylaminotoluene, and 2-chloro-5-hydroxylaminophenol, but not 4-hydroxylaminobenzoate, can also serve as substrates for the enzyme. The enzyme requires no oxygen or added cofactors for its reaction, which suggests an enzymatic mechanism analogous to the acid-catalyzed Bamberger rearrangement. (+info)
- The only reason certain strains of bacteria are becoming more and more deadly is because of overuse of antibiotics . (everything2.com)
- We knew bacteria behave differently in space and that it takes higher concentrations of antibiotics to kill them," said Zea. (spaceref.com)
- The E. coli bacteria grown in space also tended to form in clumps, perhaps a defensive maneuver of sorts that may involve a shell of outer cells protecting the inner cells from antibiotics, said Zea. (spaceref.com)
- And this experiment and others like it give us the opportunity to better understand how bacteria become resistant to antibiotics here on Earth. (spaceref.com)
- Certain species are noted for the production of broad-spectrum antibiotics, chemicals that the bacteria naturally produce to kill or inhibit the growth of other microorganisms. (britannica.com)
- This would be a major advantage over antibiotics, which have to travel through the membrane into the bacteria to be able to kill it. (sify.com)
- Furthermore, antibiotics cannot distinguish between good and evil, i.e. disease-causing, bacteria, often leading to unwanted side effects. (sify.com)
- So even if microgravity turns bacteria into superbugs, antibiotics will remain a powerful line of defence. (newscientist.com)
- A single E. coli bacteria reproducing without any competition every 20 minutes would create a population in four days that outnumbers the (of course an estimated figure) number of quarks in the Universe. (everything2.com)
- Researchers built 'logic gates' - the building blocks of a circuit - out of genes and put them into E. coli bacteria strains. (slashdot.org)
- Researchers from CU Boulder's BioServe Space Technologies designed an experiment to culture the common E. coli bacteria on ISS and treat it with several different concentrations of the antibiotic gentamicin sulfate, a drug that kills them on Earth. (spaceref.com)
- Nitrogen-fixing bacteria , microorganisms capable of transforming atmospheric nitrogen into fixed nitrogen (inorganic compounds usable by plants). (britannica.com)
- The fact is that without bacteria, the entire Earth's ecosystem would collapse. (everything2.com)
- This discovery lends support to the idea that bacteria survive on energy from Earth's crust, a process that could add to our knowledge about the deep-sea carbon cycle and the evolution of life. (redorbit.com)
- Most people think bacteria are dangerous invisible "germs" that exist to make life miserable . (everything2.com)
- While bathrooms are not as populated with germs as kitchens, they still harbor their share of illness-causing bacteria lurking everywhere from the sink faucet to the towels. (webmd.com)
- The first kind, the free-living (nonsymbiotic) bacteria, includes the cyanobacteria (or blue-green algae) Anabaena and Nostoc and genera such as Azotobacter , Beijerinckia , and Clostridium . (britannica.com)
- About the same time, German naturalist and botanist Ferdinand Cohn began to systematically organize bacteria into genera and species. (britannica.com)
- Most of the bacteria are fended off by our immune system. (sify.com)
- The majority of your genetic code has been manipulated by bacteria, who due to their small size "only" make up ten percent of your dry body weight. (everything2.com)
- Using genetic analyses, Cara Santelli of WHOI, Katrina Edwards of USC, and colleagues found three to four times more bacteria living on exposed rock than in the waters above. (redorbit.com)
- With evidence that the oceanic crust supports more bacteria than overlying water, the scientists hypothesized that reactions with the rocks themselves might offer fuel for life. (redorbit.com)
- In research that further bridges the biological and digital world, scientists at the University of California, San Francisco have created bacteria that can be programmed like a computer . (slashdot.org)
- THE propulsion system used by slime-squirting bacteria could teach rocket scientists and nano-engineers some new tricks. (newscientist.com)
- During the process of evolution, some bacteria have lost genes that encode certain biosynthetic reactions and are hence likely to require nutritional supplements. (britannica.com)
- In 1938, seeking to further distinguish the bacteria from other forms of life, American biologist Herbert F. Copeland elevated Monera to the level of kingdom. (britannica.com)
- I wonder how long before the viruses in the Virus Batteries [slashdot.org] "accidentally" combines with this programmable bacteria to form something to truly fear. (slashdot.org)
- Bacteria are capable of controlling the ecosystem, and are often responsible for the creation of viruses that wipe out over-zealous organisms like humans who fail to see their impact on the biosphere. (everything2.com)
- While it would be impossible to scientifically verify it as of now, it is highly likely that much your DNA actually codes for the creation of bacteria and viruses that are essential for your very survival. (everything2.com)
- New evidence suggests that probiotics -- good bacteria that can aid immune function -- can have a preventive effect for cold and flu viruses. (go.com)
- These should be cleaned to help reduce the spread of viruses, fungi, and bacteria. (webmd.com)
- What's new is that we conducted a systematic analysis of the changing physical appearance of the bacteria during the experiments. (spaceref.com)
- To execute a successful infection, bacteria must therefore manipulate the host to ensure their survival. (sify.com)
- Astronauts' immune systems change in space , potentially making them more susceptible to infection, so if these bacteria become more virulent or antibiotic-resistant, they could pose a risk. (newscientist.com)
- E. coli is relatively innocuous, but the infection risk for astronauts on long missions could skyrocket if microgravity also makes more dangerous bacteria, such as salmonella, permanently hardier. (newscientist.com)
- Now it turns out that the bacteria push themselves along by ejecting the slime from nozzles on their bodies. (newscientist.com)
- But when the chain is produced faster than the slime can escape, it is compressed and shoots out like silly string, giving the bacteria an extra push. (newscientist.com)
- Within the nodules the bacteria convert free nitrogen to ammonia , which the host plant utilizes for its development. (britannica.com)
- Speciation among bacteria is suspected of occurring at the level of subspecies, or ecotype, whereby genetically distinct populations survive within the same ecological niche until, through adaptation and natural selection , one type outcompetes the others, clearing the niche of its diversity. (britannica.com)
- Not only do "formerly bacteria, now organelles" occupy every nucleated cell on Earth, but true self-sufficient bacteria are required by all plant life to take nitrogen from the atmosphere and put it into the plant's vascular system. (everything2.com)
- So basically, without bacteria there would be essentially zero oxygen in the atmosphere, and no way to create protein , which requires captured nitrogen to exist. (everything2.com)
- Two kinds of nitrogen-fixing bacteria are recognized. (britannica.com)
- The symbiotic nitrogen-fixing bacteria invade the root hairs of host plants, where they multiply and stimulate formation of root nodules, enlargements of plant cells and bacteria in intimate association. (britannica.com)
- As with the general taxonomy of bacteria, the basic concept of species in bacterial systematics is problematic. (britannica.com)
- The large decrease of the bacteria cell surface in space also decreases the rate of molecule-cell interaction, which may have implications for more effectively treating astronauts with bacterial infections in space. (spaceref.com)
- The new study also showed the bacterial cell envelope-essentially its cell wall and outer membrane-became thicker, likely protecting the bacteria even more from the antibiotic, said Zea. (spaceref.com)
- Electron microscopy reveals that this structure is formed like a syringe: the base of the syringe is imbedded in the bacterial membrane and the needle protrudes out of the bacteria. (sify.com)
- To ensure sufficient nodule formation and optimum growth of legumes (e.g., alfalfa, beans, clovers, peas, soybeans), seeds are usually inoculated with commercial cultures of appropriate Rhizobium species, especially in soils poor or lacking in the required bacterium. (britannica.com)
- Unlike in higher organisms, in which a species is defined by the ability of organisms with common characteristics to interbreed and give rise to fertile offspring, bacteria generally reproduce asexually. (britannica.com)
- Streptomyces , genus of filamentous bacteria of the family Streptomycetaceae (order Actinomycetales) that includes more than 500 species occurring in soil and water. (britannica.com)
- In your body, there are ten bacteria for every one cell that contains your own DNA . (everything2.com)
- Every single cell in your body contains mitochondria , which are self-replicating " organelles " that at one point were parasitic bacteria. (everything2.com)
- If you could kill every bacteria in your body, you would probably die within a week, definitely within a month. (everything2.com)
- Without a balance of diverse bacteria in your body, one strain can wreak havoc, but within each and every one of you there is an intricate balance that can't easily be upset. (everything2.com)
- Other doctors say the function of the bacteria in the body makes using probiotics for viral infections seem an intuitive choice, especially for those who wish to try a non-drug approach. (go.com)
- According to an article in The Economist , a new study published in PNAS shows that a typical Western diet - high in fat and sugar content - adversely affects the gut bacteria of children and could lead to asthma, allergies, and other inflammatory diseases. (genomeweb.com)
- The response of the cultured bacteria included a 13-fold increase in cell numbers and a 73 percent reduction in cell volume size compared to an Earth control group, said BioServe Research Associate Luis Zea, lead study author. (spaceref.com)
- With this apparatus bacteria can inject virulence factors directly into the host cell. (sify.com)
- The close observation of these events revealed how the proteins are assembled into a syringe: the bacterium synthesizes the proteins in the cell interior, transports them through the syringe to the outside, and stacks them one after the other onto the tip of the growing needle. (sify.com)
- African children who eat a high-fiber diet (and the occasional wood-digesting insect) have gut bacteria that help them digest plant fibers and protect them from diarrhea and inflammatory disease, a new study finds. (sciencenews.org)
- Lacking any obvious relation to animals, bacteria initially were classified in the plant kingdom. (britannica.com)
- By "fundamental unit of life" I mean that bacteria are the most basic organisms to meet the definition of life , and were the first form of life to exist. (everything2.com)
- Streptomyces are characterized as gram-positive aerobic bacteria of complex form. (britannica.com)
- Biofilms have been shown to make bacteria hardier in many situations, which may present a problem if one were to form, say, on a spaceship's life support system. (newscientist.com)
- Still other researchers disagreed with the domain system, however, and in 1998 British zoologist Thomas Cavalier-Smith presented yet another classification scheme, the six-kingdom system, which contained kingdom Bacteria with two subdivisions, Eubacteria and Archaebacteria. (britannica.com)
- The longest study yet of bacteria in simulated microgravity found that their adaptations remained even when researchers tried to erase them. (newscientist.com)
- When the PEDOT coating is applied, an electrically active layer of bacteria - Geobacter sulfurreducens - naturally grows to create electricity and transfer electrons to the novel electrode. (rdmag.com)
- The conducting nanofibers create a favorable surface for this bacteria, which digests pollutants from the wastewater and produces electricity, according to the research. (rdmag.com)
- During the past several billion years of evolution, bacteria have exchanged more information than the human race could ever approach, even if we were to live through the death of the sun . (everything2.com)
- Bacteria are solely responsible for the 20% of the atmosphere that is oxygen , which is a highly reactive gas that took millions of years of evolution to harness correctly. (everything2.com)
- Long-established bacteria are less likely to hurt us, as they "genetically realize" that symbiosis works. (everything2.com)
- Bacteria are not animals, they are bacteria. (everything2.com)
- Thank you, thank you, I'll be here all week, try the fish, the bacteria in it all programmed in Sea. (slashdot.org)
- Bacteria are the fundamental units of life . (everything2.com)
- Hence, in 1990 Carl R. Woese and colleagues proposed the three-domain system, dividing life into the Bacteria, the Archaea, and the Eukarya. (britannica.com)
- Dr. Kathi Kemper of Wake Forest University Baptist Medical Center in Winston-Salem, N.C., says there is still more to learn about dose, kind of bacteria and duration of probiotic treatment. (go.com)
- On a large scale, the bacteria at the electrode could capture and degrade pollutants from the wastewater that flows by it. (rdmag.com)
- Seafloor bacteria on ocean-bottom rocks are more abundant and diverse than previously thought, appearing to "feed" on the planet's oceanic crust, according to results of a study reported in this week's issue of the journal Nature. (redorbit.com)
- In 2015 Cavalier-Smith and others revised the system to include seven kingdoms, whereby kingdom Bacteria was split into two separate kingdoms-Bacteria (containing the eubacteria) and Archaea (containing the archaebacteria). (britannica.com)
- Examples of biofilms on Earth include the scum on vinyl shower curtains, dental plaque and even collections of bacteria that can adhere to silicon in medical devices like catheters. (spaceref.com)
- While plants definitely play a role, they themselves could not exist without bacteria. (everything2.com)
- Can Good Bacteria Really Fight the Flu? (go.com)
- Some bacteria, such as the causative agents of dysentery, food poisoning, typhoid fever, and pest, have developed a specialized transport mechanism called the Type three secretion system. (sify.com)