Fimbriae

Fimbriae are long filamentous polymeric protein structures located at fimbriae surface fimbriae bacterial cells. They enable the bacteria to bind to specific receptor structures and thereby to colonise specific surfaces. Fimbriae consist of so-called major and minor subunits, which form, in a specific order, fimbriae, the fimbrial structure. In this review emphasis is put on the genetic organisation, regulation and especially on the biosynthesis of fimbriae of enterotoxigenic Escherichia coli strains, fimbriae, and more in particular on K88 and related fimbriae, fimbriae ample reference to the well-studied P and type 1 fimbriae.

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'fimbria. Send us feedback about these examples. Accessed 24 Feb. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! See Definitions and Examples ». Log In. Examples of fimbria in a Sentence.

Fimbriae

Federal government websites often end in. The site is secure. All relevant data are within the manuscript and its Supporting Information files. Gram-negative bacteria, as well as some Gram-positive bacteria, possess hair-like appendages known as fimbriae, which play an important role in adhesion of the bacteria to surfaces or to other bacteria. Unlike the sex pili or flagellum, the fimbriae are quite numerous, with of order fimbriae appendages per bacterial cell. In this paper, a recently developed hybrid model for bacterial biofilms is used to examine the role of fimbriae tension force on the mechanics of bacterial biofilms. Each bacterial cell is represented in this model by a spherocylindrical particle, which interact with each other through collision, adhesion, lubrication force, and fimbrial force. The bacterial cells absorb water and nutrients and produce extracellular polymeric substance EPS. The flow of water and EPS, and nutrient diffusion within these substances, is computed using a continuum model that accounts for important effects such as osmotic pressure gradient, drag force on the bacterial cells, and viscous shear. The fimbrial force is modeled using an outer spherocylinder capsule around each cell, which can transmit tensile forces to neighboring cells with which the fimbriae capsule collides. We find that the biofilm structure during the growth process is dominated by a balance between outward drag force on the cells due to the EPS flow away from the bacterial colony and the inward tensile fimbrial force acting on chains of cells connected by adhesive fimbriae appendages. The fimbrial force also introduces a large rotational motion of the cells and disrupts cell alignment caused by viscous torque imposed by the EPS flow. The current paper characterizes the competing effects of EPS drag and fimbrial force using a series of computations with different values of the ratio of EPS to bacterial cell production rate and different numbers of fimbriae per cell. In bacterial biofilms, bacteria are enmeshed in a self-secreted extracellular polymeric substance EPS , which is permeated by an aqueous solvent that transports nutrients, minerals and other chemicals through the EPS [ 1 ]. In general, bacteria absorb nutrients and water, using them to grow and to produce EPS.

Multigrid methods for time-dependent partial differential equations, fimbriae. Architectural transitions in Vibrio cholerae biofilms at single-cell resolution.

Fimbriae tubae project from the end of the fallopian tubes. They are lined with cilia, or hair-like structures, that guide the egg to the uterus. From there, the egg is either fertilized or shed during the menstrual cycle. The fimbriae of the uterine tube , also known as fimbriae tubae , are small, fingerlike projections connected to the end of the fallopian tubes, through which eggs move from the ovaries to the uterus. Small epithelial cells — those that line cavities throughout the body — with small, slender cilia microscopic, hair-like structures pulsate inside the fallopian tubes to guide the ovum, or egg, from the ovary to the uterus.

The infundibulum of the uterine tube is the beginning of the uterine tube, just after the abdominal ostium of uterine tube, and is in relation to the free border and medial surface of the ovary. Human anatomy 2. Underlying structures:. Human anatomy 1. IMAIOS and selected third parties, use cookies or similar technologies, in particular for audience measurement. Cookies allow us to analyze and store information such as the characteristics of your device as well as certain personal data e. For more information, see our privacy policy. You can freely give, refuse or withdraw your consent at any time by accessing our cookie settings tool.

Fimbriae

A pilus Latin for 'hair'; pl. All conjugative pili are primarily composed of pilin — fibrous proteins , which are oligomeric. Dozens of these structures can exist on the bacterial and archaeal surface. Some bacteria, viruses or bacteriophages attach to receptors on pili at the start of their reproductive cycle. Pili are antigenic. They are also fragile and constantly replaced, sometimes with pili of different composition, resulting in altered antigenicity. Specific host responses to old pili structures are not effective on the new structure. Recombination between genes of some but not all pili code for variable V and constant C regions of the pili similar to immunoglobulin diversity. As the primary antigenic determinants, virulence factors and impunity factors on the cell surface of a number of species of Gram negative and some Gram positive bacteria, including Enterobacteriaceae , Pseudomonadaceae , and Neisseriaceae , there has been much interest in the study of pili as organelle of adhesion and as vaccine components.

Convocation uwaterloo 2023

The cell minor semi-axis b is set equal to the cylinder radius, and the major semi-axis a is equal to half the cylinder length plus the radius of the hemispherical end-cap. USA , 90 , — Oliver D. Scott A. Wilson M. Functional analysis of the sialic acid-binding adhesin SfaS of pathogenic Escherichia coli by site-specific mutagenesis. A Monod model [ 60 , 61 ] was used to specify cell growth rate as a function of the nutrient concentration c S. Stenberg P. Federal government websites often end in. Examples of fimbria in a Sentence.

The fallopian tubes carry eggs from the ovaries to the uterus. The fallopian tubes transport eggs from the ovaries to the uterus. They are important parts of the female reproductive system.

Fimbriae tubae project from the end of the fallopian tubes. Marshall JS, Sala K. Smith H. Supplemental Content. Bacterial cellular morphologies cell structure plasticity Cocci Bacilli Coccobacilli Spiral. Select Format Select format. Medical Definition. Fourel V. Friedmann D. We have demonstrated that varying local interaction between individual cells, such as the total fimbriae number and EPS growth rate, can lead to qualitative change in the structural form of the bacterial colony. This figure shows that increase in number of fimbriae causes several significant changes in the colony structure. Biofilms and human health. New York: Springer Press; Cellular and Molecular Life Sciences. Delor I.