When porcine ( pig ) zona pellucida is injected into other mammals, antibodies are produced which attach to that animal's zona pellucida, preventing the sperm from attaching to the egg, therefore preventing fertilization.

When they were closer and he saw that one was a woman, he was more puzzled than ever.

When one of the men in the hall behind us spat on the floor and scraped his boot over the gob of spittle I noticed how the clerk winced.

When they reached their neighbor's house, Pamela said a few polite words to Grace and kissed Melissa lightly on the forehead, the impulse prompted by a stray thought -- of the type to which she was frequently subject these days -- that they might never see one another again.

When he added to his Pittsburgh commitments the directorship of the London Philharmonic Orchestra in 1958, he conducted one hundred fifty concerts within nine months, `` commuting '' between the two cities.

When confronted with a drunk or an insane person I have no notion of what any one of them might do to me or to himself or to others.

When Fred wheeled him back into his room, the big one looking out on the back porch, and put him to bed, Papa told him he was very tired but that he had enjoyed greatly the trip downtown.

When he came home from his office at the end of the afternoon, Breasted never knew what gathering he should expect to find, but there almost always was one.

When it was not, one of the great dramas of Washington would be presented.

When one powerful nation strives to emulate the success of another, it is only natural.

When he was in the war, he was in Law or Supplies or something like that, and an old buddy of his told me he would come down on Sundays to the Pentagon and read the citations for medals -- just like the one we sent in for Trig -- and go away with a real glow.

When something unexpected happened, one always asked for water if one were a woman, brandy if one were a man.

When enough time had elapsed so that there was little likelihood of his returning for something he had forgotten, Harold went out into the hall and stood looking into one room after another.

When he was bent over behind the wheel of the station wagon, feeling in his trouser cuffs for the ignition key which he had dropped a moment before, she came out of the house with an enormous Rumanian shawl over her head, which she had bought in that country during one of their trips abroad, and handed him a clean handkerchief through the window.

When in one letter Jessica informed me that her father did not like the idea of her going out alone on New Year's Eve, I knew for a moment an immense relief ; ;

When he showed this model as his `` solution '' as to how the Howe sewing machine operated, he was told he was `` wrong '', and discovered to his amazement that the Howe Machine, which was unknown to him in detail, used two threads while the one that he had perfected used only one.

When it is needed, one formula is as important as another.

When mold has more than one design cavity, make individual paper patterns.

When changing from one color to another, whether working on right or wrong side, pick up the new strand from underneath dropped strand.

`` When working from one of my sketches I square it up and project its linear form freehand to the watercolor sheet with charcoal.

When he had left, I could never remember whether he had poked them in their middles, laughingly, with a thick index finger or whether he was merely so much the sort of person who did this that one assumed the action, not bothering to look.

When this experiment is viewed as composed of five binomial trials, one for each member of the family, the outcomes of the trials are obviously not independent.

When now we count the frequency of the 71 items in the two language families appearing in the same column or grade, or one column or grade apart, or two or three or four, we find these differences: Af

When the younger brother wanted to look away from the human corpses and animal carcasses scattered everywhere, Heigo forbade him to do so, instead encouraging Akira to face his fears by confronting them directly.

When this marriage unraveled, Comden complained that Day cared more for her " animal friends " than she did for him.

When Darwin wrote On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life, the oldest animal fossils were those from the Cambrian Period, now known to be about 540 million years old.

When Nature failed to do this spontaneously, contact with a conductor of animal magnetism was a necessary and sufficient remedy.

When swimming, the thorax would be weighed down by the front legs, making it difficult for the animal to move its neck and legs in harmony or keep its head above the surface.

When a Chieftain or Laird required an animal to be slaughtered for meat ( whether sheep or cattle ) the workmen were allowed to keep the offal as their share.

When Braid introduced the concept of hypnotism, he equivocated over the nature of the " state ", sometimes describing it as a specific sleep-like neurological state comparable to animal hibernation or yogic meditation, while at other times he emphasised that hypnotism encompasses a number of different stages or states that are

When suitable prey arrives near a dragon's ambush site, it will suddenly charge at the animal and go for the underside or the throat.

When Rock and Pamela Anderson divorced, it was rumored that Rock's hunting passion was the cause of the relationship's end, Anderson being a keen animal rights activist.

Giovanni Boccaccio's makes this comparison in his literary commentary of the Commedia, he states, " When he had grown up and become a most ferocious animal, and of incredible strength, they tell that Minos had him shut up in a prison called the labyrinth, and that he had sent to him there all those whom he wanted to die a cruel death ".

When dealing with evidence about humans, archaeologists and palaeontologists may work together – for example palaeontologists might identify animal or plant fossils around an archaeological site, to discover what the people who lived there ate ; or they might analyze the climate at the time when the site was inhabited by humans.

When a flock of this huge a size established itself in an area, the number of local animal predators ( such as wolves, foxes, weasels, and hawks ) was so small compared to the total number of birds that little damage would be inflicted on the flock as a whole.

When animal spirits are on ebb, consumers do not want to spend and businesses do not want to make capital expenditures or hire people.

When he was accused of theft and taken before the judges, Zadig cleared himself by recounting the mental process which had allowed him to describe the two animals he had never seen: " I saw on the sand the tracks of an animal, and I easily

When game or livestock was killed, the entire animal was used.

When he tries to seize it, the panicked cat bites the narrator, and in a fit of rage, he seizes the animal, pulls a pen-knife from his pocket, and deliberately gouges out the cat's eye.

When your perception is filtered through ignorance, then you experience the animal realm.

When kept in aquaria, small sheets of dead skin can be seen in the water ( often appearing to be a thin piece of plastic ) having been sloughed off when the animal deliberately rubs itself against a piece of wood or stone.

When the animal encounters a new scent, it will lick and bite the source, then form a scented froth in its mouth and paste it on its spines with its tongue.

When the coat of arms was devised in 1690, the animal was described as a tiger (" babr ", a bookish word of Persian derivation ) with a sable in his mouth.

When a plant or animal dies, or an animal expels waste, the initial form of nitrogen is organic.

When the animal starts diving, its heart rate slows to about one-tenth of its normal rate.

When they searched Blanton's home, police found some of the paraphernalia of animal liberation raids, including code names for Coronado and Alex Pacheco — PETA's co-founder — burglary tools, two-way radios, and fake identification.

When the sacrificial animal was a bird, however, the ritual was quite different.