Prymnesin may refer to:
 | This set index page lists chemical compounds articles associated with the same name. If an internal link led you here, you may wish to change the link to point directly to the intended article. |
Prymnesin may refer to:
| | This set index page lists chemical compounds articles associated with the same name. If an internal link led you here, you may wish to change the link to point directly to the intended article. |
In mathematics, the Fibonacci numbers, commonly denoted Fn form a sequence, called the Fibonacci sequence, such that each number is the sum of the two preceding ones, starting from 0 and 1. That is,
In economics, the Gini coefficient, sometimes called Gini index, or Gini ratio, is a measure of statistical dispersion intended to represent the income or wealth distribution of a nation's residents, and is the most commonly used measurement of inequality. It was developed by the Italian statistician and sociologist Corrado Gini and published in his 1912 paper Variability and Mutability.
The Hypertext Transfer Protocol (HTTP) is an application protocol for distributed, collaborative, hypermedia information systems. HTTP is the foundation of data communication for the World Wide Web, where hypertext documents include hyperlinks to other resources that the user can easily access, for example by a mouse click or by tapping the screen in a web browser.
In probability theory, the normaldistribution is a very common continuous probability distribution. Normal distributions are important in statistics and are often used in the natural and social sciences to represent real-valued random variables whose distributions are not known. A random variable with a Gaussian distribution is said to be normally distributed and is called a normal deviate.
1 is a number, and a numerical digit used to represent that number in numerals. It represents a single entity, the unit of counting or measurement. For example, a line segment of unit length is a line segment of length 1. It is also the first of the infinite sequence of natural numbers, followed by 2.
The number π is a mathematical constant. Originally defined as the ratio of a circle's circumference to its diameter, it now has various equivalent definitions and appears in many formulas in all areas of mathematics and physics. It is approximately equal to 3.14159. It has been represented by the Greek letter "π" since the mid-18th century, though it is also sometimes spelled out as "pi". It is also called Archimedes' constant.
In statistics, the standard deviation is a measure of the amount of variation or dispersion of a set of values. A low standard deviation indicates that the values tend to be close to the mean of the set, while a high standard deviation indicates that the values are spread out over a wider range.
Transport Layer Security (TLS), and its now-deprecated predecessor, Secure Sockets Layer (SSL), are cryptographic protocols designed to provide communications security over a computer network. Several versions of the protocols find widespread use in applications such as web browsing, email, instant messaging, and voice over IP (VoIP). Websites can use TLS to secure all communications between their servers and web browsers.
The endocannabinoid system (ECS) is a biological system composed of endocannabinoids, which are endogenous lipid-based retrograde neurotransmitters that bind to cannabinoid receptors, and cannabinoid receptor proteins that are expressed throughout the vertebrate central nervous system and peripheral nervous system. The endocannabinoid system remains under preliminary research, but may be involved in regulating physiological and cognitive processes, including fertility, pregnancy, during pre- and postnatal development, appetite, pain-sensation, mood, and memory, and in mediating the pharmacological effects of cannabis.
Prymnesium parvum is a species of haptophytes (=Prymnesiophyta). The species is of concern because of its ability to produce a toxin, prymnesin. It is a flagellated alga that is normally found suspended in the water column. It was first identified in North America in 1985 and it is not known if it was introduced artificially. Toxin production mainly kills fish and appears to have little effect on cattle or humans. This distinguishes it from red tide, which are algal bloom whose toxins lead to harmful effects in people. Although no harmful effects are known, it is recommended not to consume dead or dying fish exposed to a P. parvum bloom. Prymnesium parvum of Haptophyta is sometimes termed a golden alga or a golden brown algae as is Chrysophyceae of Heterokontophyta but the taxonomy of algae is under complex revision leading to contradictions in terms especially in non scholarly texts such as those from state wildlife departments.
The watt is a unit of power. In the International System of Units (SI) it is defined as a derived unit of 1 joule per second, and is used to quantify the rate of energy transfer. In dimensional analysis, power is described by .
The version history of the Android mobile operating system began with the public release of the Android beta on November 5, 2007. The first commercial version, Android 1.0, was released on September 23, 2008. Android is continually developed by Google and the Open Handset Alliance, and it has seen a number of updates to its base operating system since the initial release.
The 2017 IAAF World Championships was the 16th edition of the global athletics competition organised by the International Association of Athletics Federations and was held in London from 4 to 13 August 2017. London was officially awarded the championships on 11 November 2011.
Prymnesin-1 is a chemical with the molecular formula C
107H
154Cl
3NO
44. It is a member of the prymnesins, a class of phycotoxins made by the alga Prymnesium parvum. It is known to be toxic to fish, causing mass fish deaths around the world, including in Texas and England.
Ichthyotoxins are compounds which are either toxic to fish or are toxins produced by fish. The toxins can be found in gar eggs and the eggs of several other species' roe. It can also be found in some species of algae such as prymnesium parvum. They include euglenophycin and prymnesins, made by algae and can cause large-scale fish deaths, and ostracitoxin made by boxfish. Many toxin producing algal species can be found both in marine and fresh water environments when the algae is in bloom. The toxin is protein based and is poisonous to humans, small mammals, and some fish. An ichthyotoxic poisoning can cause symptoms ranging in severity dependent on how much toxin was consumed. The symptoms of an ichthyotoxin poisoning can include headache, vomiting, diarrhea, dizziness, drop in blood pressure, and many others.
Prymnesin-2 is an organic compound that is secreted by the haptophyte Prymnesium parvum. It belongs to the Prymnesin family and has potent hemolytic and ichthyotoxic properties. In a purified form it appears as a pale yellow solid. P. parvum is responsible for red harmful algal blooms worldwide, causing massive fish killings. When these algal blooms occur, this compound poses a threat to the local fishing industry. This is especially true for brackish water, as the compound can reach critical concentrations more easily.
Prymnesin-B1 is a chemical with the molecular formula C
91H
136ClNO
34. It is a member of the prymnesins, a class of ladder-frame polyether phycotoxins made by the alga Prymnesium parvum. It is known to be toxic to fish. It is a so called "Type-B" prymnesin, which differ in the number of backbone cycles when compared to Type-A prymnesins like prymnesin-2.