Primers should not easily anneal with other primers in the mixture ( either other copies of same or the reverse direction primer ); this phenomenon can lead to the production of ' primer dimer ' products contaminating the mixture.

It contains a unique phenomenon called the Reversing Falls where the diurnal tides of the bay reverse the water flow of the river for several kilometres.

This phenomenon is often observed in wind tunnel testing of aircraft, and is especially important when parachute systems are involved, because unless the parachute lines extend the canopy beyond the reverse flow region, the chute can fail to inflate and thus collapse.

Negative refraction is the name for an electromagnetic phenomenon where light rays are refracted at an interface in the reverse sense to that normally expected.

Harvard researcher Edward C. Green argued that the risk compensation phenomenon could explain the failure of condom distribution programs to reverse HIV prevalence, providing a detailed explanations of his views in an op-ed article for The Washington Post and an extended interview with the BBC.

Subsequent recasting exhibited a reverse phenomenon, keeping him in his 30s for 20 years, with Tom hitting his 40s in the 1990s.

The Professor explains the change as a natural phenomenon, although it is obvious to the reader that in fact he and Bormental have simply performed the reverse operation.

In 2004, Frank Rich wrote in the New York Times that " The phenomenon has sufficiently alarmed the White House that earlier in the month its media allies tried to discredit the 9 / 11 families, particularly the so-called ' Jersey Girls ,' the four telegenic suburban widows who have forced the administration to reverse its stonewalling of the 9 / 11 commission at nearly every juncture.

Negative refraction is the name for an electromagnetic phenomenon where light rays are refracted at an interface in the reverse sense to that normally expected.

A micro-affirmation, in Rowe's writing, is the reverse phenomenon.

Innes and Zeitz first documented this phenomenon in 1988 when they noticed that participants exposed to content with a violent message exhibited traditional third-person effects while those exposed to a public service announcement exhibited the reverse.

This is a well known phenomenon in evolution known as " sexual antagonism ," and has been widely documented for many traits that are advantageous in one sex but not in the other.

Paranormal romance, inspired by Rice but mostly dropping the open sexuality of her characters in favour of more conventional sexual roles, is a remarkable contemporary publishing phenomenon.

Their involvement in child sexual abuse cases produced more allegations of SRA, adding credibility to phenomenon.

The " modern girl " phenomenon of the 1920s and early 1930s had been characterized by greater sexual freedom, but despite this, sex was usually not perceived as a source of pleasure in Japan.

In 1892, Albert von Schrenck-Notzing introduced the term algolagnia to describe " sexual " masochism, to differentiate it from Fere's earlier term called " algophilia "; Schrenck-Notzing's interpretation was that algolagnia involved lust, not love as Fere interpreted the phenomenon.

Psychologist Fredric Wertham decided that the phenomenon was a landmine of hidden and repressed Freudian issues, and that a sidekick's involvement in violent acts with his hero masked a sexual subtext.

The phenomenon of swinging, or at least its wider discussion and practice, is regarded by some as arising from the upsurge in sexual activity during the sexual revolution of the 1960s, made possible by the invention of the contraceptive pill and the emergence of treatments for many of the STI's that were known at that time.

Although the phenomenon widely known as flashing, involving a woman exposing bare nipples by suddenly pulling up her shirt and bra, may be free from sexual motive or intent, it nonetheless is public exposure and is therefore defined by statute in many states of the United States as prohibited criminal behavior.

Neuro-psychoanalyst Mark Blechner identifies the " Lady Chatterley phenomenon " in which the same sexual act can affect people in different ways at different times, depending on their subjectivity.

This phenomenon is known as genetic sexual attraction.

Popularisation of the term has resulted in its being applied to any slip-of-the-tongue phenomenon, often in an attempt by the user to humorously assign hidden motives or an air of sexual innuendo to the mistake.

A vast amount of ethnographic and archaeological evidence demonstrates that the sexual division of labor in which men hunt and women gather wild fruits and vegetables is an uncommon phenomenon among hunter-gatherers worldwide.

* A popular parlance for sexual activity in public, derived from the cultural phenomenon of " parking " as depicted in many shows and movies about the 1950s 60s and 70s.

Many high-profile criminals, particularly those who have committed atrocious crimes, receive " fan mail " in prison which is sometimes amorous or sexual, presumably as a result of this phenomenon.

The opposite phenomenon, when relatives do fall in love, is known as genetic sexual attraction.

In biology and psychology, the Coolidge effect is a phenomenon — seen in nearly every mammalian species in which it has been tested — whereby males ( and to a lesser extent females ) exhibit renewed sexual interest if introduced to new receptive sexual partners, even after refusing sex from prior but still available sexual partners.

Susan J. Napier has described the popularity of the ideal magical girlfriend, for example, Belldandy and Ai to be a backlash against the " yellow cab " social phenomenon, where some Japanese women were seeking out sexual relationships with non-Japanese men.

This phenomenon may be related, at least in part, to shared shock anxiety and avoidance of physical and sexual contact.

What tends to be overlooked in these types of commentaries is that some of the most desired men and women are, inexplicably, also among the involuntarily celibate, which makes it unlikely that pressuring women to date and / or marry less desirable men or vice versa through a sense of " duty " or obligation, as was the case before the sexual revolution, would actually in itself put a stop to the incel phenomenon, whether for men in particular or either gender generally.

Genetic sexual attraction ( GSA ) is a term that describes the phenomenon of sexual attraction between close relatives, such as siblings, first and second cousins or a parent and offspring, who first meet as adults.

Genomic imprinting is a genetic phenomenon by which certain genes are expressed in a parent-of-origin-specific manner.

A similar imprinting phenomenon has also been described in flowering plants ( angiosperms ).

Some human disorders are associated with genomic imprinting, a phenomenon in mammals where the father and mother contribute different epigenetic patterns for specific genomic loci in their germ cells.

Within science, the greylag goose is most notable as being the bird with which the ethologist Konrad Lorenz first did his major studying into the behavioural phenomenon of imprinting.

* Hormonal imprinting, a biological phenomenon

The phenomenon of imprinting studied by Konrad Lorenz is characteristic of precocial birds.

* Metabolic imprinting, the phenomenon by which the metabolism of the developing fetus may be " programmed " during gestation

Spalding carried out some remarkable experiments on animal behaviour, and discovered the phenomenon now known as imprinting, later rediscovered by Oskar Heinroth, then studied at length and popularised by Konrad Lorenz.

He also rediscovered the phenomenon of imprinting, reported in the 19th century by Douglas Spalding but not followed up at the time.

This is important because of the phenomenon of genomic imprinting where genes are expressed differently depending on which parent contributed them.

In mammals ( mice, humans, pigs ), only the allele for insulin-like growth factor-2 ( IGF2 ) inherited from one's father is active ; that inherited from the mother is not — a phenomenon called imprinting. The mechanism: the mother's allele has an insulator between the IGF2 promoter and enhancer.