Articles tagged with Bacterial Populations
Researchers found that identical genetic changes occurred between independently evolving E. coli populations, driven by negative frequency dependence and natural selection. This discovery challenges traditional views of evolution and species diversity.
A University of Colorado study reveals that lung and GI cancer patients are more prone to E. coli and Klebsiella pneumoniae infections, particularly after aminopenicillin treatment. This knowledge can inform targeted antibiotic therapy before complications arise.
The new methods have been applied to analyse the genetic variation of MRSA bacteria, demonstrating that more than half of its genetic variation is caused by horizontal genomic transfer. This allows for the estimation of when a certain strain of MRSA has entered a country and started to spread to hospitals.
Researchers found that a virulent strain of H. pylori reduced the risk of deaths from stroke by 55% and lung cancer by 45%. The study, which analyzed data from nearly 10,000 individuals, also found no association between H. pylori positivity or cagA-positivity and all-cause mortality.
Researchers at EPFL have developed a new tool using optofluidics to observe individual bacteria, revealing that persistent populations are dynamic and can adapt through mutation. This challenges traditional theories of bacterial resistance, offering new insights into the evolution of antibiotic efficacy.
Scientists have engineered Escherichia coli bacteria that can deliberately die to protect their population, promoting the survival of survivors. The altruistic behavior emerges after sufficient time has passed and can be controlled by tuning the extent of programmed cell death.
In a study, MIT physicists found that cooperative yeast members outperform cheaters when competing with bacteria in an experimental setup. This is because cooperators have easier access to sugars and can spread less due to population density constraints.
Researchers at the University of Washington examined the pathogen Pseudomonas aeruginosa, which colonizes in cystic fibrosis patients. They found that certain cells called cheater cells share public goods without releasing them, leading to destabilization of cooperation and potential new strategies for infection control.
Researchers at Michigan State University have discovered how E. coli evolved to consume citrate, a previously inaccessible food source. The study reveals that multiple mutations were required for the bacteria to develop this new trait, and that complex traits can evolve quickly and repeatedly in microbial populations.
Bacteria exhibit social behaviors similar to plants and animals, including cooperation and competition. The study found that certain individuals produce antibiotics to defend against competitors, while others benefit from association with these producers.
Researchers found that a few marine microbes produce natural antibiotics that protect their populations from competitors and neighboring populations. This cooperative behavior, where some individuals act as protectors of the many, is a surprising example of social organization in microbial populations.
Scientists have identified a new signaling system in bacteria that enables them to produce an appendage, swim away, and inhibit biofilm formation. This discovery could lead to understanding how to break up harmful bacterial biofilms on teeth or medical devices.
Researchers have identified Demodex mites as the primary carriers of bacteria that trigger rosacea. The bacteria produce molecules provoking an immune reaction in patients, leading to tissue degradation and inflammation.
William Hanage, a renowned expert in infectious disease epidemiology, has received the 2012 ICAAC Young Investigator Award from the American Society for Microbiology. His research focuses on understanding the factors behind the response of bacterial populations to antimicrobials and vaccines.
A recent study of the Old Order Amish population found associations between certain bacterial species and metabolic syndrome, suggesting potential targets for medication, diet or lifestyle changes. The researchers identified specific species but not full gut communities linked to metabolic syndrome traits.
Researchers discovered that certain types of bacteria form biofilms on filters, breaking off into drinking water due to pH levels. Simple changes to filter cleaning and water pH can shift the balance towards beneficial bacteria, potentially improving water quality.
Researchers have identified a set of viruses shared among individuals from different parts of the world, which target the gut microbiota. The study found that nearly 80% of these viruses are common to two or more individuals, suggesting a global reservoir of phages attacking our gut bacteria.
Researchers at Brown University found that selenium nanoparticles can reduce Staphylococcus aureus bacteria on implant materials by up to 90%. The coating is more effective than current silver-based alternatives, which are less biocompatible and expensive.
UC Santa Cruz researchers suggest that Lyme disease has increased across northeastern and midwestern US over past three decades, contrary to stabilizing deer populations. Red fox declines are attributed to coyote growth, leading to smaller animal populations that serve as ticks' hosts.
The Human Microbiome Project found that the human body contains trillions of microorganisms, contributing millions of unique protein-coding genes. These microbes play a vital role in human health, enabling digestion and absorption of nutrients, and producing beneficial compounds.
Gut bacteria play a crucial role in regulating the immune system and preventing autoimmune diseases such as rheumatoid arthritis. Larger-than-normal populations of specific gut bacteria may trigger disease development, particularly in genetically predisposed individuals.
Research reveals that gut microbes fine-tune body weight by extracting energy from food, with changes in diet and environment significantly altering their composition. The study suggests that therapeutic modification of the gut microbiome may offer a promising approach to treating obesity and related health conditions.
Scientists at the University of Nottingham have proven a long-held theory about bacterial communication by showing that quorum sensing's effectiveness depends on bacterial population density. This discovery can inform research into disrupting QS and stopping toxin production in pathogenic organisms like Pseudomonas aeruginosa.
Researchers found that specialized bacterial populations occupy separate ecological niches during and after algal blooms, allowing them to degrade organic matter. This discovery resolves the plankton paradox by explaining how different groups of bacteria coexist in seemingly homogeneous habitats.
A study by North Carolina State University has found that feral pigs in the state are exposed to Brucella suis, a harmful bacteria that can be transmitted to people through unsafe butchering and consumption of undercooked meat. The bacteria can also spread in pig populations, causing abortions in affected swine.
Researchers found that gene sweeps can sweep through populations on their own, similar to sexual eukaryotes. This suggests a unified method of evolution for prokaryotes and eukaryotes, challenging traditional views of species classification.
A new study suggests that adding prebiotic ingredients to infant formula can help colonize the newborn's gut with a stable population of beneficial bacteria, enhancing immunity in formula-fed infants. Researchers found that probiotics also significantly enhanced immunity in formula-fed babies, particularly those delivered by C-section.
Researchers at the University of Pittsburgh have developed a novel way to culture tuberculosis bacteria, which could lead to new treatments and insights into its extraordinary resilience against environmental stresses. The bacteria's ability to form biofilms is thought to be a key factor in its resistance to treatment.
Research on low-dose X-ray irradiation reveals significant reduction in aerobic bacteria and mold/yeast populations, while maintaining sugar levels in asparagus. The study found that X-ray treatment can enhance consumer safety by decreasing the number of viable microorganisms.
A new paper by leading scientists emphasizes the need for a global response to combat antibiotic-resistant bacteria, which pose a life-threatening threat. The researchers recommend establishing research priorities, improving international funding, and implementing public education campaigns to address this growing crisis.
A study by University of California, San Diego biologists reveals that bacteria age and use asymmetric division to improve population fitness. By giving more cellular damage to one daughter cell and less to the other, bacteria allow for rejuvenation and diversity in their reproductive investment.
Scientists have devised a way to measure the impact of age on bacterial growth rates, allowing for new understanding and modeling of bacterial populations. This development could provide new insights into how genetic factors affect their life cycle and potentially lead to alternative methods to curb bacterial growth.
A common bacterium, Wolbachia, has been found to prevent the Aedes aegypti mosquito from transmitting the dengue virus, a major public health threat. The discovery offers a promising alternative to current control methods and could have a transformative effect on global health.
A University of Houston biologist discovered that beneficial gene mutations can interfere with each other, leading to a decline in population fitness. This finding has implications for predicting the progression of chronic diseases and could lead to new treatments.
A new study suggests that structural weaknesses in proteins, rather than natural selection, may have led to the evolution of biological complexity. Flaws in protein packing make them more unstable in water, promoting interactions and intracellular teamwork.
Researchers found that the rate of hand contamination among graduating students is 100 times lower than health workers caring for patients with MRSA, likely due to a lower prevalence of MRSA in graduates. Handshakes may remove pathogens acquired earlier, providing reassurance to individuals who shake hands regularly.
Researchers discover gamma deltaintraepithelial lymphocytes (γδ IEL) play a crucial role in maintaining friendly relations between gut microbes and intestinal lining. These cells patrol intestinal borders, sensing microbial invasion and producing antibiotic proteins to prevent rogue bacteria from spreading to deeper tissue.
Research suggests that stress alters the balance of intestinal bacteria, leading to increased levels of immune biomarkers and priming the innate immune system. The study found that antibiotics can reduce this effect, highlighting the role of gut bacteria in modulating stress-induced immune responses.
Research from the University of Arizona found that bacteria in the genus Rickettsia can rapidly evolve whiteflies, making them more likely to survive and reproduce. The bacteria manipulate sex ratios, causing more female offspring to be born, which is unusual for such a short period.
A collaborative study between UH and Michigan State University reveals that bacteria evolving quickly can outcompete those that initially grow faster but then become extinct. Understanding these evolutionary dynamics may help design roadblocks to antibiotic resistance.
A new study links specific groups of gut bacteria to the development of fatty liver disease. The researchers found that certain bacterial populations correlated with increased fat in the liver during a restricted choline diet. These findings suggest that individual variations in gut bacteria may play a role in the disease, and could le...
A systematic review found that prison TB spread significantly increases the incidence of TB in the general population. The average incidence of TB in prisons was 23 times higher than in the general population.
A new study found that an intestinal enzyme helps maintain a healthy balance of beneficial bacteria in the gut, potentially preventing serious health issues. The enzyme, IAP, blocks toxic molecules on pathogenic bacteria and restores beneficial E. coli strains after antibiotic treatment.
Researchers aim to optimize women's health by examining bacterial balance in the vagina. The Vaginal Microbiome Project will develop diagnostic tests to prevent preterm birth, a major consequence of abnormal bacterial balance.
Research by Prof. Eshel Ben-Jacob suggests that bacteria can effectively control 'noise' in their environment and make decisions that benefit the entire colony. Bacteria's group decision-making processes can inform human decision-making, particularly in situations with multiple stakeholders.
Scientists compare ocean microbe genomes to understand environmental adaptations and evolutionary changes. The study found significant differences in phosphorus-related genes between Atlantic and Pacific populations, revealing a strong selective force driving these adaptations.
Researchers at Kiel University found a unique antibacterial peptide in Hydra embryo that prevents benign bacteria from colonizing. This mechanism helps protect the embryo and potentially other organisms, altering the composition of bacterial colonization in adults as well.
Researchers at the University of Nottingham have found that bacteria that do not cooperate with their infection-causing colleagues can reduce infection severity. By exploiting this selfish behavior, QS-deficient bacteria can outnumber and outcompete other bacteria, leading to reduced toxin production and milder infections.
Research discovers that uncooperative bacteria can benefit from 'opting out' of toxin production, reducing infection severity and outnumbering other bacteria. This new treatment approach could complement current therapies for antibiotic-resistant Staphylococcus aureus infections.
Research reveals that a small percentage of bacteria become highly resistant supermutants, while most survive without being resistant to antibiotics. These supermutants produce high levels of indole, a signaling molecule that promotes survival in harsh environments.
Researchers at Boston University and Harvard discovered that bacteria produce indole to help vulnerable members survive antibiotic attacks, but this comes at the cost of their own well-being. This finding sheds new light on the complexity of bacterial strains and has significant implications for the medical community.
Researchers found that bacteria cells start dividing normally but unexpectedly 'pop' when the colony reaches a certain density. This phenomenon is linked to the amplification of plasmids in response to cell density, highlighting the importance of considering hidden interactions in engineered gene circuits.
Researchers analyzed bacterial populations in the noses and throats of seven healthy adults using two culture-independent methods. They found distinct differences between nasal and throat bacteria, with some groups more prevalent in one area than the other.
Underhill will investigate how interactions between bacteria lead to collective responses, developing a theoretical framework and computer simulation methods. The award includes educational tools for exploring the role of fluid mechanics in bacterial systems.
Studies found correlations between specific bacterial groups and obesity, as well as genetic variations affecting gut diversity. These results could lead to individualized probiotic or antibiotic treatments for obesity.
A Montreal study reveals that more than 70 percent of bottled water samples contain heterotrophic bacteria counts above the recommended limits set by the United States Pharmacopeia. High microbial counts were found in several famous brands, with some exceeding 100 times the permitted limit.
A three-year study found that lab-evolved bacteria colonized better and adapted to the mouse gut, leading to a significant increase in bacterial density. The diverse bacterial population showed evolutionary adaptations, including increased resistance to cell death.
A team of researchers led by Malak Kotb has found that as dominant members of a bacterial community surrender to host immune defenses, they are replaced by a hyperaggressive, mutant minority population that thrives and takes over. This study provides new insights into the dynamics of bacterial evolution in live species.
Researchers at Michigan State University found a bacterium, Wolbachia, that can stop the dengue virus from replicating in mosquitoes, blocking disease transmission. The study provides new hope for controlling dengue fever, which affects 2.5 billion people worldwide.
Research shows that intestinal bacteria can contribute to human obesity and metabolic disease by influencing appetite and metabolism. TLR5-deficient mice exhibit metabolic syndrome, a cluster of disorders increasing the risk of heart disease and diabetes.