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Merohedral twinning occurs when the lattices of the contact twins superimpose in three dimensions, such as by relative rotation of one twin from the other.
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twinning and occurs
Monozygotic twinning occurs in birthing at a rate of about three in every 1000 deliveries worldwide.
North American dizygotic twinning occurs about once in 83 conceptions, and triplets about once in 8000 conceptions.
This twinning condition usually occurs very early in pregnancy.
Crystal twinning occurs when two separate crystals share some of the same crystal lattice points in a symmetrical manner.
When twinning occurs
twinning and when
Crystals can be marred by twinning, which can occur when a unit cell can pack equally favorably in multiple orientations ; although recent advances in computational methods may allow solving the structure of some twinned crystals.
Feldspar within a pegmatite may display exaggerated and perfect twinning, exsolution lamellae, and when affected by hydrous crystallization, macroscale graphic texture is known, with feldspar and quartz intergrown.
As the story hit national news in the United Kingdom, further investigation revealed a link was established between the communities in 1981 when the mayor of Manteo, John Wilson, met with the mayor of Bideford, Pam Paddon, although it was recorded as friendly rather than formal twinning in Bideford.
* Lübbecke in Germany since 1973, largely down to the special relationship between the Durnovaria Silver Band who met the Lübbecker Schutzenmusik Corps at an event in Bayeux when Bayeux was twinning with Lübbecke in 1968
* In animation, twinning refers to when two parts on opposite sides of a character's body move the same way
" TV Guide gave the film one star out of four, noting that it " suffers from some very dicey twinning effects when the brothers are in frame together.
Another early example of town twinning dates back to 1947 when Bristol Corporation ( later Bristol City Council ) sent five ' leading citizens ' on a goodwill mission to Hanover.
Vancouver, British Columbia, was also a notable city to enter into an intercontinental twinning arrangement when, in 1944, it twinned with the Ukrainian city of Odessa, which at the time was part of the Soviet Union.
Another first for town twinning occurred in 1967 when Rochester, Minnesota and Knebworth, UK teamed up to bring a primary medical research front.
In most cases, the association, especially when formalised by local government, is known as " town twinning " ( though other terms, such as " partner towns " or " sister cities " are sometimes used instead ), and while most of the places included are towns, the list also comprises villages, cities, districts, counties, etc.
Their finest hour was when they met two German people of much the same nature when attending a celebration of a twinning of two towns.
A delegation of Wrea Green residents travelled to St Bris to make the twinning official, but the first large exchange came when, at Easter 2006, 43 French came to stay in Wrea Green.
twinning and contact
The twinning programme was reviewed in 2011 and it was suggested that the link with Schleswig be ended due to a lack of contact between the towns.
Gypsum flowers most often exhibit simple twinning ( known as contact twins ); where parallel, long, needle-like crystals, sometimes having severe curves and bends, will frequently form “ ram ’ s horns ”, " fishtail ", " arrow / spear-head ", and " swallowtail " twins.
Plagioclase, quartz, gypsum, and spinel often exhibit contact twinning.
twinning and twins
Crystal twinning is common in feldspars, especially polysynthetic twins in plagioclase and Carlsbad twins in alkali feldspars.
The Yoruba have the highest rate of twinning in the world, at 45-50 twin sets ( or 90-100 twins ) per 1, 000 live births, possibly because of high consumption of a specific type of yam containing a natural phytoestrogen which may stimulate the ovaries to release an egg from each side.
The world's highest rates of twinning are found across Central Africa, where there are 18-30 twin sets ( or 37-62 twins ) per 1, 000 live births.
Dizygotic twinning ranges from six per thousand births in Japan ( similar to the rate of monozygotic twins ) to 14 and more per thousand in some African countries.
Dizygotic twins are also more common for older mothers, with twinning rates doubling in mothers over the age of 35.
Regarding spontaneous or natural monozygotic twinning, a recent theory posits that monozygotic twins are formed after a blastocyst essentially collapses, splitting the progenitor cells ( those that contain the body's fundamental genetic material ) in half, leaving the same genetic material divided in two on opposite sides of the embryo.
This is in marked contrast to dizygotic twinning, which ranges from about six per thousand births in Japan ( almost similar to the rate of identical twins, which is around 4 – 5 ) to 15 and more per thousand in some parts of India and up to over 20 in some Central African countries.
Half-identical or semi-identical twins ( also referred to as " half twins ") are the result of a very rare form of twinning in which the twins inherit exactly the same genes from their mother but different genes from their father.
Although examples of half-identical twins have been found, the exact mechanism of their conception is not well-understood, but could theoretically occur in polar body twinning where sperm cells fertilize both the ovum and the second polar body.
This category contains articles about the conjoined twinning phenomenon and about conjoined twins ; and about people who have or had a conjoined twin.
Additional contributions by Weinberg to statistical genetics included the first estimate of the rate of twinning – Realizing that identical twins would have to be same-sex, while dizygotic twins could be either same or opposite sex, Weinberg derived the formula for estimating the frequency of monozygotic and dizygotic twins from the ratio of same sex and opposite twins to the total of maternities.
twinning after 17 days, the separation of the twins does not happen.
twinning and dimensions
The crystal should be sufficiently large ( typically larger than 0. 1 mm in all dimensions ), pure in composition and regular in structure, with no significant internal imperfections such as cracks or twinning.
twinning and such
This muddy situation possibly originated from the indirect nature of the experimental evidence, as well as experimental issues such as sample quality, impurity scattering, twinning, etc.
This active town twinning began in 1991 and there are regular events, such as a produce market from each of the other countries and festivals.
This active town twinning began in 1991 and there are regular events, such as a produce market from each of the other countries and festivals.
This active town twinning began in 1991 and there are regular events, such as a produce market from each of the other countries and festivals.
This active town twinning began in 1991 and there are regular events, such as a produce market from each of the other countries and festivals.
* — Valenciennes ( France ) ( existing since 1955 making it the 2nd oldest such twinning in the UK )
There are private institutions in Malaysia that offer such LL. B ( Hons ) programme through twinning arrangements.
This active town twinning began in 1991 and there are regular events, such as a produce market from each of the other countries and festivals.
This active town twinning began in 1991 and there are regular events, such as a produce market from each of the other countries and festivals.
This active town twinning began in 1991 and there are regular events, such as a produce market from each of the other countries and festivals.
Magnetic shape-memory alloys, with near-stoichiometric Ni < sub > 2 </ sub > MnGa being the most studied example, differ from other magnetostrictive materials, such as Terfenol-D and Galfenol, as they produce much larger strains by twinning, sometimes as large as 9 %, under relatively low bias magnetic fields.
This active town twinning began in 1991 and there are regular events, such as a produce market from each of the other countries and festivals.
This active town twinning began in 1991 and there are regular events, such as a produce market from each of the other countries and festivals.
This active town twinning began in 1991 and there are regular events, such as a produce market from each of the other countries and festivals.
These often add a strongly international element into local life, such as the " Pont " twinning project between Pontypridd and Mbale, Uganda, and the creation of " Fairtrade " relationships with primary producers worldwide.
This active town twinning began in 1991 and there are regular events, such as a produce market from each of the other countries and festivals.
Sometimes, other government bodies enter into a " twinning " relationship, such as the agreement between the provinces of Hainan in China and Jeju-do in South Korea.
This active town twinning began in 1991 and there are regular events, such as a produce market from each of the other countries and festivals.
This active town twinning began in 1991 and there are regular events, such as a produce market from each of the other countries and festivals.
This active town twinning began in 1991 and there are regular events, such as a produce market from each of the other countries and festivals.
This active town twinning began in 1991 and there are regular events, such as a produce market from each of the other countries and festivals.
This active town twinning began in 1991 and there are regular events, such as a produce market from each of the other countries and festivals.
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