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:
Hottest Latest Alphabetical (A-Z) Alphabetical (Z-A)
Type:
All Topic Review Biography
Topic Review
Structure and Properties of Gelatin
Gelatin is a natural biopolymer that is intrinsically biocompatible and biodegradable, has low immunogenicity, and is classified as Generally Recognized as Safe (GRAS) by the United States Food and Drug Administration (FDA). It consists of an amphoteric polymer that is derived from collagen by alkaline-, acid-, or heat-based hydrolysis.
  • 13.0K
  • 24 May 2023
Topic Review
Mongol Conquest of Khwarezmia
The Mongol conquest of Khwarezmia (Persian: حمله مغول به خوارزم‎), or the Mongol invasion of Iran (Persia) (Persian: حمله مغول به ایران‎), from 1219 to 1221 marked the beginning of the Mongol conquest of the Islamic states. The Mongol expansion would ultimately culminate in the conquest of virtually all of Asia as well as parts of Eastern Europe, with the exception of Japan , the Mamluk Sultanate of Egypt, Siberia, and most of the Indian subcontinent and Southeast Asia. According to the Persian historian Minhaj-i-Siraj, Genghis Khan sent the ruler of the Khwarazmian Empire, Muhammad II, a message seeking trade and greeted him as his neighbor: "I am master of the lands of the rising sun while you rule those of the setting sun. Let us conclude a firm treaty of friendship and peace", or he said "I am Khan of the lands of the rising sun while you are sultan of those of the setting sun: Let us conclude a firm agreement of friendship and peace." The Mongols' original unification of all "people in felt tents", unifying the nomadic tribes in Mongolia and then the Turkomans and other nomadic peoples, had come with relatively little bloodshed, and almost no material loss. The Mongol wars with the Jurchens was known to Muhammad II and he agreed to this peace treaty. War between the Mongols and the Khwarazmian Empire started less than a year later, when a Mongol caravan and its envoys were massacred in the Khwarazmian city of Otrar. In the ensuing war, lasting less than two years, the Khwarazmian dynasty was destroyed and the Khwarazmian Empire was conquered.
  • 12.9K
  • 16 Nov 2022
Topic Review
Moon Man (Internet Meme)
Mac Tonight is a fictional character used in the marketing for McDonald's restaurants during the mid-1980s. Known for his crescent moon head, sunglasses and piano-playing, the character used the song "Mack the Knife" which was made famous in the United States by Bobby Darin. Throughout the campaign, Mac was portrayed by actor Doug Jones in his fourth Hollywood job. Originally conceived as a promotion to increase dinner sales by Southern California licensees, Mac Tonight's popularity led McDonald's to take it nationwide in 1987. Although McDonald's ceased airing the commercials and retired the character after settling a lawsuit brought by Darin's estate in 1989, the company reintroduced the character nineteen years later throughout Southeast Asia in 2007.
  • 13.0K
  • 24 Nov 2022
Topic Review
Mapogo Lion Coalition
The Mapogo lion coalition was a band of male South African lions that controlled the Sabi Sand region in Kruger National Park. The coalition became infamous for their sheer power and strength in taking over and dominating an area of approximately 70,000 ha (170,000 acres). It is believed the Mapogos killed in excess of 100 lions and cubs in a little over a year. The statistics may be higher given their coverage of such large territories. At its peak, the coalition consisted of six males - the leader Makulu (also spelled as Makhulu), Rasta, Scar, Pretty Boy, Kinky Tail and Mr. T.
  • 12.9K
  • 09 Oct 2022
Topic Review
Throughput
In general terms, throughput is the rate of production or the rate at which something is processed. When used in the context of communication networks, such as Ethernet or packet radio, throughput or network throughput is the rate of successful message delivery over a communication channel. The data these messages belong to may be delivered over a physical or logical link, or it can pass through a certain network node. Throughput is usually measured in bits per second (bit/s or bps), and sometimes in data packets per second (p/s or pps) or data packets per time slot. The system throughput or aggregate throughput is the sum of the data rates that are delivered to all terminals in a network. Throughput is essentially synonymous to digital bandwidth consumption; it can be analyzed mathematically by applying the queueing theory, where the load in packets per time unit is denoted as the arrival rate (λ), and the throughput, where the drop in packets per time unit, is denoted as the departure rate (μ). The throughput of a communication system may be affected by various factors, including the limitations of underlying analog physical medium, available processing power of the system components, and end-user behavior. When various protocol overheads are taken into account, useful rate of the transferred data can be significantly lower than the maximum achievable throughput; the useful part is usually referred to as goodput.
  • 12.9K
  • 20 Oct 2022
Topic Review
History of Measurement
The earliest recorded systems of weights and measures originate in the 3rd or 4th millennium BC. Even the very earliest civilizations needed measurement for purposes of agriculture, construction, and trade. Early standard units might only have applied to a single community or small region, with every area developing its own standards for lengths, areas, volumes and masses. Often such systems were closely tied to one field of use, so that volume measures used, for example, for dry grains were unrelated to those for liquids, with neither bearing any particular relationship to units of length used for measuring cloth or land. With development of manufacturing technologies, and the growing importance of trade between communities and ultimately across the Earth, standardized weights and measures became critical. Starting in the 18th century, modernized, simplified and uniform systems of weights and measures were developed, with the fundamental units defined by ever more precise methods in the science of metrology. The discovery and application of electricity was one factor motivating the development of standardized internationally applicable units.
  • 12.9K
  • 03 Nov 2022
Topic Review
Nasolabial Angle in Orthodontic Diagnosis
The nasolabial angle (NLA) is one of the key factors to be studied in an orthodontic diagnosis for the aesthetics of the nose and facial profile.
  • 12.9K
  • 06 Feb 2022
Topic Review
List of Oxidation States of the Elements
This is a list of known oxidation states of the chemical elements, excluding nonintegral values. The most common states appear in bold. The table is based on that of Greenwood and Earnshaw, with additions noted. Oxidation state 0, which occurs for all elements, is implied by the column with the symbol of the element. The format of the table, which was devised by Dmitri Mendeleev in 1889, shows the periodicity of the oxidation states of the elements.
  • 12.8K
  • 18 Oct 2022
Topic Review
Energy Management Strategy
A Comprehensive Review on Classification, Energy Management Strategy, and Control Algorithm for Hybrid Electric Vehicles
  • 12.8K
  • 22 Oct 2020
Topic Review
Renewable Energy Supply Chain
The renewable energy supply chain (RESC) is defined as “the transformation of raw energy into usable energy and involves an effective set of management principles from the point of acquisition of energy resources to the point of consumption of usable energy”.
  • 12.7K
  • 16 Feb 2021
  • Page
  • of
  • 5488
Featured Entry Collections
>>

Featured Books

>>
Encyclopedia of Social Sciences
Encyclopedia of COVID-19
Encyclopedia of Fungi
Encyclopedia of Digital Society, Industry 5.0 and Smart City
Video Production Service
Feedback