Certain elements have no stable isotopes and are composed only of radioactive isotopes: specifically the elements without any stable isotopes are technetium ( atomic number 43 ), promethium ( atomic number 61 ), and all observed elements with atomic numbers greater than 82.

Certain kinds of organisms require particular additional elements, for example the magnesium in chlorophyll in green plants, the calcium in mollusc shells, or the iron in the hemoglobin in vertebrate animals ' red blood cells.

Certain elements of the game are reminiscent of rugby: for instance, the degree of force that defense may use to stop the attacker with the ball, together with the lack of protections and helmets.

Certain pure elements found in Group IV of the periodic table are semiconductors.

Certain genetic elements derived from viruses, such as highly effective promoters, are commonly used in molecular biology research today.

Certain radioactive elements ( such as plutonium-239 ) in “ spent ” fuel will remain hazardous to humans and other creatures for hundreds or thousands of years.

Certain elements that are normally toxic are, for certain organisms or under certain conditions, beneficial.

Certain elements of overseas culture have also been introduced to metropolitan culture ( as, for example, the musical form the biguine ).

Certain spells require expensive or rare elements to work properly, while the majority are merely spoken.

Certain elements of the line have been excavated, some reconstructed, and a few destroyed.

Certain elements of The Passion of the Christ do not have precedent in earlier depictions of the Passion.

Certain similar elements were already evident, even influences from Western classical music like Gershwin's Cuban Overture with its characteristic ' Latin ' clave rhythm.

Certain elements of his isolationism, especially his advocacy of a non-interventionist foreign policy, have enjoyed a minor comeback among a few scholars since 2001.

Certain elements have clearly been omitted from the play, including the reasoning for Laura's fascination with Jim's freckles ( linked to a book that she loved and often reread, Freckles by Gene Stratton-Porter ).

" Certain elements in the film were taken from Mankiewicz's own experience: the sled Rosebud was based — according to some sources-on a very important bicycle that was stolen from him .... some of Kane's speeches are almost verbatim copies of Hearst's.

Certain circuit topologies may be impractical if no DC path is provided for bias current to the amplifier elements.

Certain federal-state transfers, however, do contain equalizing elements.

Certain approaches also examine how rhetorical elements compare with the traditional elements of a narrative or drama.

# Certain characteristic properties of elements can be foretold from their atomic masses.

Certain elements of the lexical-phonological principle are known to exist outside of humans.

Certain plot elements ( including many of the details surrounding the missile deal ) border on preposterous, but that often goes with the territory in films of this genre.

Certain gameplay elements, such as the game's shooting mechanics, were called " frustrating " by Eurogamer, where " more than half the time the targeting reticule refuses to acknowledge an oncoming enemy until they're virtually in front of you.

Certain versions imply that Zeus gave Semele the heart to eat to impregnate her.

A recent study done by the observer of Chinese film and television, Ying Zhu, suggests that “ CCTV is full of serious-minded creators who regularly experience bouts of self-doubt, philosophical ambivalence, and in some cases, clinical depression .” During her extensive interviews with key CCTV players, Zhu notes that “ Certain common themes, about ideals distorted or altogether thwarted by commercial and political pressure, emerged .”

Song Structure: Certain types of music have a regular structure, which an experienced dancer can frame his or her moves around.

In 1970, Moorehead appeared as a dying woman who haunts her own house in the early Night Gallery episode " Certain Shadows on the Wall.

Certain entities have proven resistant or immune to her freezing ability, such as ghosts, furies, certain demons and warlocks.

Certain aspects of the composition are traditional: the Virgin's head is located along the vertical axis, which crosses her right eye, fixed upon the beholder.

Certain aspects of her personality resemble those of Marilyn Monroe, particularly her actual yet often overlooked intelligence.

Certain that she loves the more handsome man, he bitingly congratulates her for trapping Marne.

Certain DeMille is eager to shoot her script, Norma drops in on the set of his current film.

Certain individuals with both powers and physical alterations are still considered Aces, such as the celebrity Ace known as Peregrine, who despite having a pair of feathered wings growing from her shoulder blades is otherwise physically attractive in appearance.

Certain elements became leitmotifs: Julia's fondness for wine ; her ornate speech ; her staunch defense of the use of butter ( with margarine invariably referred to as " that other spread ") and cream ; her standard issue " impeccably clean towel "; and her closing line at the end of every show: " Bon appétit!

In 2004 she released her debut feature length film, Somersault ( 2004 ), which was entered in the Un Certain Regard section at the 2004 Cannes Film Festival.

One of her last important roles was in Frank Capra's first film for Columbia Pictures, That Certain Thing ( 1928 ).

Certain paintings also show these epics being performed lying down, with the singer beating time on his or her abdomen with the hands, but this practice has faded into obscurity ( Philippi 26 ).

Certain now of her case, Cordelia continues to Sir Ronald's house where Miss Leaming lets her in and takes her gun from her.

Certain extenuating circumstances reduce her sentence to the lowest possible for such an offence.

Certain scholars have concluded from the above differences that a woman's voice is also her awrah in some cases.

Certain Christians also hold that, in the act of creating a human being, his or her dignity is also upheld by the presence of a loving union between the two partners, so that " only when love exists should the creation of other persons be envisaged.

Certain self-limiting illnesses or minor injuries may not require further medical care past the first aid intervention.

Certain tree species, such as hemlock, have also been particularly depleted by past logging activity.

Certain beliefs regarding the status of their past leader, and several of their outreach tactics and theology make them controversial in other orthodox groups.

Certain users are sent to the past, while others are sent to the future.

Certain medievalists explain this by supposing that Joinville had often recounted his past orally or that he had previously committed it to writing before beginning his work.

# Certain Iranian languages, such as Rushani, distinguish only transitivity ( in the past tense ), using a transitive case for both A and O, and an intransitive case for S. This is sometimes called a double-oblique system, as the transitive case is equivalent to the accusative in the non-past tense.

Certain goods are considered contraband in some systems, and they have to be smuggled past police patrols to their buyers.

Certain past and present members including Blackmoon, Ahriman, Caligula and Chaq Mol have each declared an affinity for Satanism, with Ahriman and Caligula notably being practitioners of LaVeyan Satanism.

Certain artists quoted references to past or present art, but in general color field painting presents abstraction as an end in itself.

Certain actions, such as sneaking past a guard post, must be timed carefully to succeed.