Your browser does not fully support modern features. Please upgrade for a smoother experience.
Subject:
All Disciplines Arts & Humanities Biology & Life Sciences Business & Economics Chemistry & Materials Science Computer Science & Mathematics Engineering Environmental & Earth Sciences Medicine & Pharmacology Physical Sciences Public Health & Healthcare Social Sciences
Sort by:
Most Viewed Latest Alphabetical (A-Z) Alphabetical (Z-A)
Filter:
All Topic Review Biography Peer Reviewed Entry Video Entry
Topic Review
The Biomechanics of Cartilage
Articular cartilage (AC) sheathes joint surfaces and minimizes friction in diarthrosis. The resident cell population, chondrocytes, are surrounded by an extracellular matrix and a multitude of proteins, which bestow their unique characteristics. AC is characterized by a zonal composition (superficial (tangential) zone, middle (transitional) zone, deep zone, calcified zone) with different mechanical properties. An overview is given about different testing (load tests) methods as well as different modeling approaches.
  • 3.6K
  • 14 Apr 2021
Topic Review
Lignin
Lignin is an extremely abundant substance that has a chemical functionality that endows it with the necessary properties to be an attractive platform material for the new millennium. We must continue to explore and exploit its potentiality as a stand-alone material, raw feedstock for refining to chemicals, polymeric filler, and co-composite material. This review highlights hardwood-derived lignin, a little explored form of lignin, as a promising platform material.
  • 3.6K
  • 13 Aug 2020
Topic Review
Muscle
Muscle is a soft tissue found in most animals, and is one of the four basic animal tissues, along with nervous tissue, epithelium, and connective tissue. Muscle cells contain protein filaments called myofilaments of actin and myosin that slide past one another, producing a contraction that changes both the length and the shape of the cell. Muscles function to produce force and motion. They are primarily responsible for maintaining and changing posture, locomotion, as well as movement of internal organs, such as the contraction of the heart and the movement of food through the digestive system via peristalsis. Muscle tissue is derived from the embryonic mesodermal germ layer in a process known as myogenesis. There are three types of muscle, of which skeletal and cardiac muscle are striated and smooth muscle is not. Muscle action can be classified as being either voluntary or involuntary. Cardiac and smooth muscles contract without conscious thought and are termed involuntary, whereas the skeletal muscles contract upon command. Skeletal muscles in turn can be divided into fast and slow twitch fibers. Muscles are predominantly powered by the oxidation of fats and carbohydrates, but anaerobic chemical reactions are also used, particularly by fast twitch fibers. These chemical reactions produce adenosine triphosphate (ATP) molecules that are used to power the movement of the myosin heads. The term muscle is derived from the Latin musculus meaning "little mouse" perhaps because of the shape of certain skeletal muscles or because contracting muscles look like mice moving under the skin.
  • 3.6K
  • 22 Oct 2022
Biography
Bill Donohue
William Anthony Donohue (born July 18, 1947) is an American Roman Catholic. He has been president of the Catholic League in the United States since 1993.[1] Donohue was born in the borough of Manhattan in New York City , New York. He began his teaching career in the 1970s working at St. Lucy's School in Spanish Harlem. In 1977, he took a teaching position at La Roche College in McCandless, Pe
  • 3.6K
  • 30 Dec 2022
Topic Review
Canopy
In biology, the canopy is the aboveground portion of a plant cropping or crop, formed by the collection of individual plant crowns. In forest ecology, canopy also refers to the upper layer or habitat zone, formed by mature tree crowns and including other biological organisms (epiphytes, lianas, arboreal animals, etc.). The communities that inhabit the canopy layer are thought to be involved in maintaining forest diversity, resilience, and functioning. Sometimes the term canopy is used to refer to the extent of the outer layer of leaves of an individual tree or group of trees. Shade trees normally have a dense canopy that blocks light from lower growing plants.
  • 3.6K
  • 25 Nov 2022
Topic Review
Frying Technology and Starchy Food
Frying is commonly used by consumers, restaurants, and industries around the globe to cook and process foods. Compared to other food processing methods, frying has several potential advantages, including reduced processing times and the creation of foods with desirable sensory attributes. Frying is often used to prepare starchy foods. After ingestion, the starch and fat in these foods are hydrolyzed by enzymes in the human digestive tract, thereby providing an important source of energy (glucose and fatty acids) for the human body. Conversely, overconsumption of fried starchy foods can induce overweight, obesity, and other chronic diseases. Moreover, frying can generate toxic reaction products that can damage people’s health. Consequently, there is interest in developing alternative frying technologies that reduce the levels of nutritionally undesirable components in fried foods, such as vacuum, microwave, air, and radiant frying methods.
  • 3.6K
  • 25 Aug 2021
Topic Review
Vestigiality
Vestigiality is the retention during the process of evolution of genetically determined structures or attributes that have lost some or all of the ancestral function in a given species. Assessment of the vestigiality must generally rely on comparison with homologous features in related species. The emergence of vestigiality occurs by normal evolutionary processes, typically by loss of function of a feature that is no longer subject to positive selection pressures when it loses its value in a changing environment. The feature may be selected against more urgently when its function becomes definitively harmful, but if the lack of the feature provides no advantage, and its presence provides no disadvantage, the feature may not be phased out by natural selection and persist across species. Examples of vestigial structures (also called degenerate, atrophied, or rudimentary organs) are the loss of functional wings in island-dwelling birds; the human vomeronasal organ; and the hindlimbs of the snake and whale. The human appendix is no longer considered vestigial.
  • 3.6K
  • 24 Oct 2022
Topic Review
Resonance
Resonance describes the phenomenon of increased amplitude that occurs when the frequency of an applied periodic force (or a Fourier component of it) is equal or close to a natural frequency of the system on which it acts. When an oscillating force is applied at a resonant frequency of a dynamic system, the system will oscillate at a higher amplitude than when the same force is applied at other, non-resonant frequencies. Frequencies at which the response amplitude is a relative maximum are also known as resonant frequencies or resonance frequencies of the system. Small periodic forces that are near a resonant frequency of the system have the ability to produce large amplitude oscillations in the system due to the storage of vibrational energy. Resonance phenomena occur with all types of vibrations or waves: there is mechanical resonance, Orbital resonance, acoustic resonance, electromagnetic resonance, nuclear magnetic resonance (NMR), electron spin resonance (ESR) and resonance of quantum wave functions. Resonant systems can be used to generate vibrations of a specific frequency (e.g., musical instruments), or pick out specific frequencies from a complex vibration containing many frequencies (e.g., filters). The term resonance (from Latin resonantia, 'echo', from resonare, 'resound') originated from the field of acoustics, particularly the sympathetic resonance observed in musical instruments, e.g., when one string starts to vibrate and produce sound after a different one is struck.
  • 3.6K
  • 27 Oct 2022
Topic Review
Horned Lizard
The horned lizard (genus Phrynosoma) is a distinctive group of reptiles within the family Phrynosomatidae, known for their flattened, toad-like bodies, short tails, and characteristic cranial horns. Often referred to as "horned toads" or "horny toads," these lizards are native to North and Central America and are noted for their unique morphological adaptations, cryptic coloration, and defensive behaviors, including the rare ability to squirt blood from their eyes.
  • 3.6K
  • 18 Aug 2025
Topic Review
Micro-Algal Biotechnology
Environment is everything including both the living and non living things in the earth’s ecosystem. Today the pollution of the environment is a serious concern facing humanity and other life forms in the world. The environment is daily polluted by natural and anthropogenic (man-mad) factors due to inattention and improper use of the existing science and technology. Several physicochemical methods are used for protection of the pollution in the environment but these techniques have its own advantage and disadvantage. In recent years, using biological methods specially, microalgae for environmental pollution protection is the best one, because it is suitable, produce less and or non toxic products, cost effective and eco-friendly methods to our environment. Microalgae are the important groups of living organisms used for biotechnological utilizations such as for environmental protection, Agricultural usage, biofule production, pharmaceutical production etc. without any environmental factor. This review focuses on the environmental applications of micro-algal biotechnology for treatment of wastewater nutrients, removal of heavy metals from the natural water, mitigation of CO2, removal of dyes and dyestuffs from their effluents and their agricultural usage without any factor in the natural environment.
  • 3.6K
  • 30 Oct 2020
Topic Review
Perceived Sensory Dimensions
Perceived Sensory Dimensions (PSDs) is a tool that defines eight different cultural ecosystem services. They correspond to different human needs (rest, exercise, socialising, pleasure, or security) resulting in rehabilitation and health and well-being promotion. An experiment was conducted to study the potential of PSDs to restore people who experienced stressful accidents. One hundred and fifty-seven participants were recruited and asked first to watch a film clip of serious accidents, then to look at the pictures, depicting one particular type of PSDs, while listening to its respective audio recording. Their stress levels were measured before exposure to the stressor (baseline), after exposure to the stressor (pre-test), and after exposure to a particular type of PSDs (post-test). The results show that all eight PSDs effectively provide mental recovery, but there are statistical differences in their potentials. As such, it is proposed that the combined potential of the PSDs is needed, and should be used to increase the capacity and supply of health-promoting urban green areas
  • 3.6K
  • 18 May 2021
Topic Review
List of Volcanic Eruptions on Iceland
This is a list of recorded volcanic eruptions on Iceland.
  • 3.6K
  • 01 Nov 2022
Topic Review
Ashtavinayaka
Ashtavinayak (Marathi: अष्टविनायक) literally means "eight Ganeshas" in Sanskrit. Ganesh is the Hinduism/Hindu deity of unity, prosperity & learning and removes obstacles. The term refers to eight Ganeshas. Ashtavinayaka yatra trip refers to a pilgrimage to the eight Hindu temples in Maharashtra state of India that house eight distinct idols of Ganesh, in a pre-ascertained sequence. The Ashtavinayak yatra or pilgrimage covers the eight ancient holy temples of Ganesh which are situated around Pune. Each of these temples has its own individual legend and history, as distinct from each other as the murtis in each temple. The form of each murti of Ganesh and His trunk are distinct from one another. However, there are other temples of eight Ganesh in various other parts of Maharashtra; the ones around Pune are more well known than the former. It is believed to be for completion of Ashtavinayak Yatra visit the first Ganpati after visiting all the eight Ganpatis again, to complete the yatra.
  • 3.6K
  • 29 Nov 2022
Topic Review Peer Reviewed
Substance Release from Polyelectrolyte Microcapsules
Controlled release of substance from polyelectrolyte microcapsules is a triggered degradation of the microcapsule membrane that is extensive enough to release the contained substances out into the environment. Membrane degradation can be a result of enzymatic digestion, ultrasound or light exposure, heating, application of a magnetic field, pH or ionic strength changes in the solution or bacteria-mediated processes. This technology can be used for the targeted release of drugs, and for the development of self-healing materials and new generation pesticides.
  • 3.6K
  • 18 Apr 2022
Topic Review
Animal Jam
Animal Jam is an online virtual world developed by WildWorks. It was originally launched in 2010, in collaboration with the National Geographic Society. With about 160 million registered players, Animal Jam is one of the many fastest-growing online children's properties in the world. In Animal Jam, players discover and learn various facts about zoology using the game's numerous features, including mini-games, adventures, parties, and social interactions. Due to its growing popularity, Animal Jam has spawned different types of merchandise, including figurine toys, children's books, and a subscription box. Although Animal Jam is primarily played online, the Animal Jam universe has been expanded to incorporate mobile devices such as smartphones, tablets, and iOS devices. The most popular Animal Jam mobile app is Play Wild which is a 3D version of the Animal Jam world. WildWorks has also developed other apps that are based on the Animal Jam game including Tunnel Town, AJ Jump, and Dash Tag.
  • 3.6K
  • 24 Nov 2022
Topic Review
3D Printing in Organ-on-a-Chip Platforms
Three-dimensional (3D) in vitro models, such as organ-on-a-chip platforms, are an emerging and effective technology that allows the replication of the function of tissues and organs, bridging the gap amid the conventional models based on planar cell cultures or animals and the complex human system. Hence, they have been increasingly used for biomedical research, such as drug discovery and personalized healthcare. A promising strategy for their fabrication is 3D printing, a layer-by-layer fabrication process that allows the construction of complex 3D structures.
  • 3.6K
  • 21 May 2021
Topic Review
The Effects of Stevia Consumption on Gut Bacteria
Stevia, a zero-calorie sugar substitute, is recognized as safe by the Food and Drug Administration (FDA) and the European Food Safety Authority (EFSA). In vitro and in vivo studies showed that stevia has antiglycemic action and antioxidant effects in adipose tissue and the vascular wall, reduces blood pressure levels and hepatic steatosis, stabilizes the atherosclerotic plaque, and ameliorates liver and kidney damage. 
  • 3.6K
  • 19 Apr 2022
Topic Review
Heterocyclic Crown Ethers
Crown ethers are heterocyclic compounds present as cyclic oligomers in their simple form. These are extremely versatile compounds exhibiting higher binding affinity towards metal ions, including s-block and transition metal ions. For example, 18-crown-6 has a cavity that fits the size of 4f transition metal ions and has reflected exceptional attraction for complexation with the lanthanide ions.
  • 3.6K
  • 27 Jan 2022
Topic Review
Kikuchi Lines
Kikuchi lines are patterns of electrons formed by scattering. They pair up to form bands in electron diffraction from single crystal specimens, there to serve as "roads in orientation-space" for microscopists uncertain of what they are looking at. In transmission electron microscopes, they are easily seen in diffraction from regions of the specimen thick enough for multiple scattering. Unlike diffraction spots, which blink on and off as one tilts the crystal, Kikuchi bands mark orientation space with well-defined intersections (called zones or poles) as well as paths connecting one intersection to the next. Experimental and theoretical maps of Kikuchi band geometry, as well as their direct-space analogs e.g. bend contours, electron channeling patterns, and fringe visibility maps are increasingly useful tools in electron microscopy of crystalline and nanocrystalline materials. Because each Kikuchi line is associated with Bragg diffraction from one side of a single set of lattice planes, these lines can be labeled with the same Miller or reciprocal-lattice indices that are used to identify individual diffraction spots. Kikuchi band intersections, or zones, on the other hand are indexed with direct-lattice indices i.e. indices which represent integer multiples of the lattice basis vectors a, b and c. Kikuchi lines are formed in diffraction patterns by diffusely scattered electrons, e.g. as a result of thermal atom vibrations. The main features of their geometry can be deduced from a simple elastic mechanism proposed in 1928 by Seishi Kikuchi, although the dynamical theory of diffuse inelastic scattering is needed to understand them quantitatively. In x-ray scattering, these lines are referred to as Kossel lines (named after Walther Kossel).
  • 3.6K
  • 09 Nov 2022
Topic Review
Civilian Casualties
Civilian casualties occur when civilians are killed or injured by non-civilians, mostly law enforcement officers, military personnel, rebel group forces, or terrorists. Under the law of war, it refers to civilians who perish or suffer wounds as a result of wartime acts. The term is generally applied to situations in which violence is committed in pursuit of political goals. During periods of armed conflict, there are structures, actors, and processes at a number of levels that affect the likelihood of violence against civilians. The term "civilian casualties" is sometimes used in non-military situations, for example to distinguish casualties to police vs. to criminals such as bank robbers.
  • 3.6K
  • 20 Nov 2022
  • Page
  • of
  • 2853
Featured Entry Collections
>>

Featured Reprints

>>
Encyclopedia of Digital Society, Industry 5.0 and Smart City
Encyclopedia of Engineering
Encyclopedia of Social Sciences
Encyclopedia of Medieval Royal Iconography
Academic Video Service
Feedback