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It was also suggested that darts might be a "gift" of calcium. These theories have proved to be incorrect; recent research has led to a new understanding of the function of love darts.
A close look into the behavior of Cornu aspersum shows that it is not the mechanical action of the dart that increases paternity in the sperm donor, but instead it is triggered by the nature of the mucus that coats the dart.
The love dart, also known as a " gypsobelum ", is often made of calcium carbonate  which is secreted by a specialized organ within the reproductive system of several families of air-breathing snails and slugs, mainly in terrestrial pulmonate gastropod mollusks within the clade Stylommatophora.
Darts can range in size from about 30 millimetres 1. Typically most darts are less than 5 millimetres 0.
There is considerable variety in both the overall shape and the cross section of the love dart. The morphology shape and form of the dart is species-specific.
For example, individual snails of the two rather similar helicid species Cepaea hortensis and Cepaea nemoralis can sometimes only be distinguished by examining the shape of the love dart and the vaginal mucus glands which in the anatomical diagram are marked "MG" and are positioned off the structure marked "V".
There is a complex hermaphroditic reproductive system in pulmonate snails those snails that have a lung rather than a gill or gills.
Their reproductive system is completely internal, except for the active protrusion eversion of the penis for copulation.
The outer opening of the reproductive system is called the "genital pore"; it is positioned on the right hand side, very close to the head of the animal.
This opening is virtually invisible however, unless it is actively in use. The love dart is created and stored before use in a highly muscular internal anatomical structure known as the stylophore or dart sac also known as the bursa telae.
The exact positioning of the stylophore varies, but it is in the vicinity of the eversible penis and the vagina, where these two structures open into the "atrium", a common area right inside the genital pore.
The opening of the stylophore leads directly into the atrium in certain species in the families Vitrinidae , Parmacellidae , Helminthoglyptidae , Bradybaenidae , Urocyclidae , Ariophantidae , and Dyakiidae.
The opening of the stylophore can instead lead to the penis, as is the case in some species of Aneitinae a subfamily of Athoracophoridae , Sagdidae , Euconulidae , Gastrodontidae and Onchidiidae.
Alternatively, it can lead to the vagina, as in the case in some species of Ariopeltinae a subfamily of Oopeltidae , Ariolimacinae a subfamily of Ariolimacidae , Philomycidae , other species within the Bradybaenidae , and also in the Hygromiidae , Helicidae and Dyakiidae.
Only two families have darts present in every species: the Bradybaenidae and in the Dyakiidae. In all the other families there is reduction or loss of dart-making ability in some of the species cf.
Many species have only one dart sac, however other species have several. Snails in the family Bradybaenidae have more than one dart sac, and some species of Hygromiidae and Helmintoglyptidae have four dart sacs.
All pulmonate land snails are hermaphrodites , and have a complete and rather elaborate set of both male and female reproductive organs see the simplified anatomical diagram above , but the majority of pulmonate land snails have no love darts and no dart sac.
Calcareous composed of calcium carbonate darts are found in a limited number of pulmonate families  within the Stylommatophora.
Most of these families are within the land snail superfamily Helicoidea :  Helicidae , Bradybaenidae , Helminthoglyptidae , Hygromiidae , Humboldtianidae previously considered to be a part of the Hygromiidae.
Calcium carbonate darts are also found in the family Zonitidae within the superfamily Zonitoidea , and in one family of slugs, the Philomycidae , which are within the superfamily Arionoidea.
Lightly calcified darts occur in the snail and semi-slug family Urocyclidae , within the superfamily Helicarionoidea. Chitinous composed of chitin love darts occur in the pulmonate land snail families Ariophantidae superfamily Helicarionoidea , in the family Helicarionidae superfamily Helicarionoidea , in the Vitrinidae superfamily Limacoidea , and in the slug family Parmacellidae superfamily Parmacelloidea.
Within the more ancient clade Systellommatophora , chitin darts are found in the pulmonate sea slugs of the family Onchidiidae , in the superfamily Onchidioidea.
Love darts made of cartilage occur in the family Gastrodontidae. Because of the presence of darts in many superfamilies of the Stylommatophora, it seems likely that love darts appeared during the early evolution of the Pulmonata , and that the ancestors of the Stylommatophora possessed darts already.
During evolution, darts appear to have been lost secondarily, i. Vestigial darts ones that exist only in a rudimentary condition occur in the family Sagdidae ,  and in many Helicoidea , the surrounding organs have also degenerated become non-functional.
The sarcobelum is a fleshy or cuticle-coated papilla which is considered to be a degenerated, previously dart-bearing, organ. Darts Interviews See all.
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Mature and complete async-await for user interfaces containing event-driven code, paired with isolate-based concurrency. A programming language optimized for building user interfaces with features such as the spread operator for expanding collections, and collection if for customizing UI for each platform.
A programming language that is easy to learn, with a familiar syntax. Asynchronous programming in Dart is characterized by the Future and Stream classes.
Where a normal function returns the result, an asynchronous function returns a Future, which will eventually contain the result.
The future will tell you when the result is ready. A stream is a sequence of asynchronous events. It is like an asynchronous Iterable—where, instead of getting the next event when you ask for it, the stream tells you that there is an event when it is ready.
Streams can be created in many ways, which is a topic for another article, but they can all be used in the same way: the asynchronous for loop commonly just called await for iterates over the events of a stream like the for loop iterates over an Iterable.
For example:. This code simply receives each event of a stream of integer events, adds them up, and returns a future of the sum.
When the loop body ends, the function is paused until the next event arrives or the stream is done. The function is marked with the async keyword, which is required when using the await for loop.
Streams are done when there are no more events in them, and the code receiving the events is notified of this just as it is notified that a new event arrives.
When reading events using an await for loop, the loops stops when the stream is done. In some cases, an error happens before the stream is done; perhaps the network failed while fetching a file from a remote server, or perhaps the code creating the events has a bug, but someone needs to know about it.
Where do you throw the darts from? The play area for darts is determined based on the center of the board bull. The place where you throw from It is called the throw line.
Distance Distance from directly below the board to the throw line is cm. Height The distance from the floor to the bull is cm.
Grip The way you hold the darts is called the grip. Holding the dart with three fingers First place your index finger on the dart and find the spot where the dart is level.
Holding the dart with four fingers. Use your index and middle finger to find the spot where the dart is level.
Stance The position of your feet when throwing darts is called the "stance". Middle stance Medium style Stand diagonally to the dart board This is the most standard stance.
Closed stance Side style Stand completely sideways to the dart board The front feet is placed on the throw line for this stance, this make it easier to take the same angle and stance each time.Hilfe: Dart Livescore Service auf cattbass.com bietet Dart Livescores für PDC Dartwettkampfe und, unterstützt auch Turnierergebnisse, Auslosungen und. Übersicht aller Events am Dienstag, den in den Wettbewerben. Die Darts Live Ergebnisse von cattbass.com bieten schnelle Darts Live Ergebnisse und Resultate. Folgt PDC Darts Ergebnisse - Premier League und andere. Vom Dezember bis zum 1. Januar können Sie die besten Pfeile-Werfer der Welt LIVE auf SPORT1 im Free-TV oder Livestream verfolgen. Dazu finden Sie auf.