Viscoelastic Substances
Viscosity
Substance P
Rheology
Elastic Modulus
Mechanical characterization of biomimetic membranes by micro-shaft poking. (1/34)
(+info)Viscoelastic adhesive mechanics of aldehyde-mediated soft tissue sealants. (2/34)
(+info)Elastin-mimetic protein polymers capable of physical and chemical crosslinking. (3/34)
(+info)Viscoexpression technique in manual small incision cataract surgery. (4/34)
Viscoexpression method of nucleus delivery in manual small incision cataract surgery is described in this article. The practical modifications to the conventional technique in special situations are presented. Intraoperative and postoperative problems likely to be encountered and the steps to avoid them and tackle them effectively are discussed. (+info)Biomechanics: cell research and applications for the next decade. (5/34)
(+info)The mechanism of spontaneous oscillatory contractions in skeletal muscle. (6/34)
(+info)Cytoskeletal polymer networks: viscoelastic properties are determined by the microscopic interaction potential of cross-links. (7/34)
(+info)Analysis of flow-structure interaction in the larynx during phonation using an immersed-boundary method. (8/34)
(+info)Viscoelastic substances are materials that exhibit both viscous and elastic properties when undergoing deformation. In the context of medicine, viscoelastic substances are often used to describe certain biological fluids, such as synovial fluid found in joints, or the vitreous humor in the eye. These fluids have a complex structure that allows them to behave as a liquid and a solid simultaneously, providing resistance to sudden force while also allowing for smooth movement over time.
Artificial viscoelastic substances are also used in medical applications, such as in surgical sealants and hemostatic agents, which are designed to control bleeding by forming a gel-like substance that fills wounds and helps to promote clotting. These materials have unique properties that allow them to conform to the shape of the wound and provide sustained pressure to help stop bleeding.
Viscosity is a physical property of a fluid that describes its resistance to flow. In medical terms, viscosity is often discussed in relation to bodily fluids such as blood or synovial fluid (found in joints). The unit of measurement for viscosity is the poise, although it is more commonly expressed in millipascals-second (mPa.s) in SI units. Highly viscous fluids flow more slowly than less viscous fluids. Changes in the viscosity of bodily fluids can have significant implications for health and disease; for example, increased blood viscosity has been associated with cardiovascular diseases, while decreased synovial fluid viscosity can contribute to joint pain and inflammation in conditions like osteoarthritis.
In medicine, elasticity refers to the ability of a tissue or organ to return to its original shape after being stretched or deformed. This property is due to the presence of elastic fibers in the extracellular matrix of the tissue, which can stretch and recoil like rubber bands.
Elasticity is an important characteristic of many tissues, particularly those that are subjected to repeated stretching or compression, such as blood vessels, lungs, and skin. For example, the elasticity of the lungs allows them to expand and contract during breathing, while the elasticity of blood vessels helps maintain normal blood pressure by allowing them to expand and constrict in response to changes in blood flow.
In addition to its role in normal physiology, elasticity is also an important factor in the diagnosis and treatment of various medical conditions. For example, decreased elasticity in the lungs can be a sign of lung disease, while increased elasticity in the skin can be a sign of aging or certain genetic disorders. Medical professionals may use techniques such as pulmonary function tests or skin biopsies to assess elasticity and help diagnose these conditions.
Substance P is an undecapeptide neurotransmitter and neuromodulator, belonging to the tachykinin family of peptides. It is widely distributed in the central and peripheral nervous systems and is primarily found in sensory neurons. Substance P plays a crucial role in pain transmission, inflammation, and various autonomic functions. It exerts its effects by binding to neurokinin 1 (NK-1) receptors, which are expressed on the surface of target cells. Apart from nociception and inflammation, Substance P is also involved in regulating emotional behaviors, smooth muscle contraction, and fluid balance.
Rheology is not a term that is specific to medicine, but rather it is a term used in the field of physics to describe the flow and deformation of matter. It specifically refers to the study of how materials flow or deform under various stresses or strains. This concept can be applied to various medical fields such as studying the flow properties of blood (hematology), understanding the movement of tissues and organs during surgical procedures, or analyzing the mechanical behavior of biological materials like bones and cartilages.
The Elastic Modulus, also known as Young's modulus, is a measure of the stiffness of a material. It is defined as the ratio of stress (force per unit area) to strain (partial deformation or change in length per unit length) in the elastic range of deformation of a material. In other words, it measures how much a material will deform (change in length or size) when subjected to a given amount of force. A higher elastic modulus indicates that a material is stiffer and less likely to deform, while a lower elastic modulus indicates that a material is more flexible and will deform more easily. The elastic modulus is typically expressed in units of Pascals (Pa) or Gigapascals (GPa).
Mechanical stress, in the context of physiology and medicine, refers to any type of force that is applied to body tissues or organs, which can cause deformation or displacement of those structures. Mechanical stress can be either external, such as forces exerted on the body during physical activity or trauma, or internal, such as the pressure changes that occur within blood vessels or other hollow organs.
Mechanical stress can have a variety of effects on the body, depending on the type, duration, and magnitude of the force applied. For example, prolonged exposure to mechanical stress can lead to tissue damage, inflammation, and chronic pain. Additionally, abnormal or excessive mechanical stress can contribute to the development of various musculoskeletal disorders, such as tendinitis, osteoarthritis, and herniated discs.
In order to mitigate the negative effects of mechanical stress, the body has a number of adaptive responses that help to distribute forces more evenly across tissues and maintain structural integrity. These responses include changes in muscle tone, joint positioning, and connective tissue stiffness, as well as the remodeling of bone and other tissues over time. However, when these adaptive mechanisms are overwhelmed or impaired, mechanical stress can become a significant factor in the development of various pathological conditions.
Nonlinear viscoelastic1
- This substance is classified as a nonlinear viscoelastic liquid. (digitaltechviews.com)
Viscous4
- Unlike the previous tear film replacements, which were mainly viscous in nature, viscoelastic solutions, particularly those based on hyaluronan, exhibited very interesting, potentially beneficial, rheological properties, especially when slightly altered to become elastoviscous. (lww.com)
- The biomechanical properties of human skin are a complex combination of elastic (elastin fibers) and viscous (collagen fibers and surrounding intercellular ground substance) components. (cosmeticsandtoiletries.com)
- That is, substances which are neither completely elastic, nor entirely viscous. (anton-paar.com)
- The specific field of viscometry covers ideally viscous fluids, and - considering certain restrictions - also viscoelastic liquids, i.e. viscous fluids that contain an elastic portion. (anton-paar.com)
Visco elastic1
- It is also used for the injection and removal of air, visco-elastic substances, & miotics. (medicregister.com)
Hyaluronan2
- When combined with water, hyaluronan forms a viscoelastic solution. (trbchemedica.co.uk)
- Of all the viscoelastic substances, hyaluronan solutions possess the highest degree of pseudoplasticity. (trbchemedica.co.uk)
Fluids3
- The study of viscoelastic fluids as artificial tears dates back to the late 1970s. (lww.com)
- Fluids can be defined as substances that have zero shear modulus or in simpler terms a fluid is a substance which cannot resist any shear force applied to it. (wn.com)
- Especially when it comes to complex fluids, substances of many consistencies can flow. (inverse.com)
OVDs5
- Most case-patients were exposed during surgery to ocular viscoelastic devices (OVDs) from the same manufacturer (company A). We isolated Fusarium spp. (cdc.gov)
- During the epidemiologic investigation, KMFDS collected commercially available samples of ocular viscoelastic devices (OVDs) from 6 manufacturers to conduct quality testing. (cdc.gov)
- OVDs are substances injected under the cornea to maintain the shape of the eye during cataract surgery and remain in the eyeball until the last step of surgery, when the OVD is removed. (cdc.gov)
- Objective To compare the performance and safety in cataract surgery of two ophthalmic viscoelastic devices (OVDs), each having separate dispersive and cohesive characteristics and different concentrations. (bmj.com)
- Ophthalmic viscoelastic devices (OVDs) are commonly classified into two main categories depending on their rheological properties: dispersive and cohesive. (bmj.com)
Corneal1
- PRIOR to the use of viscoelastic materials (VEMs), corneal edema was the most common cause of failed cataract surgery. (paojournal.com)
Classify2
- There are many examples of substances proving difficult to classify. (phys.org)
- According to a material's properties, we either classify it as a viscoelastic solid (like e.g. sweet jelly) or as a viscoelastic liquid (like e.g. a yoghurt drink or shower gel). (anton-paar.com)
Fibers1
- The axonal fibers and ground substance material were implemented using hyper-viscoelastic constitutive models, which were calibrated using white and gray matter brain tissue material testing data available in the literature. (springer.com)
Fluid is a substance1
- In physics, a fluid is a substance that continually deforms (flows) under an applied shear stress, no matter how small. (phys.org)
Ground substance1
- The white matter was decomposed into myelinated axon tracts and an isotropic ground substance that had similar material properties to gray matter. (springer.com)
VISCOSITY2
- Substances that display the physical properties of ELASTICITY and VISCOSITY. (uchicago.edu)
- The distinction is made by evaluating the viscosity of the substance. (phys.org)
Magnetic2
- Magnetic putty is the same substance, only this time, an iron oxide powder is added. (mentalfloss.com)
- The iron oxide will make the entire substance react to magnetic forces. (mentalfloss.com)
Liquid2
- This is a viscoelastic substance that has properties of a liquid and properties of rubber. (sorbothane.com)
- If you haven't, what you need to know is that it has viscoelastic properties, so you can pour it like a liquid but also bounce it like a solid. (mentalfloss.com)
Foam2
- Memory foam, which responds to your body's heat and weight, is a highly resilient, temperature-sensitive substance. (cnbusinessnews.com)
- Foam is a petroleum-based substance called polyurethane. (livpure.com)
ELASTICITY1
- A cutometer is used to evaluate elasticity in human skin, as it allows the measurement of the viscoelastic properties of the skin in vivo. (cosmeticsandtoiletries.com)
Shear stress1
- A fluid is defined as a substance that continually deforms (flows) under an applied shear stress. (wn.com)
Solutions1
- Viscoelastic solutions that are injected into JOINTS in order to alleviate symptoms of joint-related disorders such as OSTEOARTHRITIS. (rush.edu)
Materials3
- In everyday life, we mostly come across viscoelastic materials. (anton-paar.com)
- Viscoelastic materials in everyday life. (anton-paar.com)
- This substance, classified as a semi-crystalline copolymer, melts at 180°C, shorter than Lightweight materials, which melt between 200°C and 260°C. This implies that a heated printing bed isn't required when manufacturing with PLA, and an enclosed compartment isn't required either. (digitaltechviews.com)
Resist1
- The dual-nature of these substances causes them to resist applied forces in a time-dependent manner. (uchicago.edu)
Actions1
- Labetalol hydrochloride tablets, USP are adrenergic receptor blocking agents that have both selective alpha 1 -adrenergic and nonselective beta-adrenergic receptor blocking actions in a single substance. (guidelinecentral.com)
Material1
- PLA, also referred to as polylactic acid or polylactide, is a plastic material derived primarily from sustainable elements such as corn starch, cassava roots, or sugar canes instead of other commercial substances predominantly made from hydrocarbons. (digitaltechviews.com)
Specific1
- It is possible for this substance to degrade, but only beneath specific aerobic circumstances. (digitaltechviews.com)
Made1
- Although the substance is made from recyclable components found in the environment, it does not imply compostable. (digitaltechviews.com)
Separate1
- Techniques used to separate mixtures of substances based on differences in the relative affinities of the substances for mobile and stationary phases. (lookformedical.com)
Safe1
- Foams are keeping you safe from harmful substances, dust mites, mould and its hypo-allergenic. (eazyshop.com.au)