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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.
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Certain and elements
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 and have
Willard Thorp, in his new book, American Writing In The Twentieth Century, observes, quite validly it seems: `` Certain subjects are conspicuously absent or have been only lightly touched.
Certain features we have touched upon: philosophy as a logical, deductive system from which a social science methodology can be built up ; ;
`` Certain people must have known about it ''.
Certain facts of their lives have been attributed to him, as well as some of their works: thus the Life of St Bernard should be ascribed to Alain of Auxerre and the Commentary upon Merlin to Alan of Tewkesbury.
Certain natural substances are reputed to have anxiolytic properties, including the following:
Certain basic teachings appear in many places throughout the early texts, so most scholars conclude that the Buddha must at least have taught these teachings:
Certain indigenous Dayak people ( such as the Kayan, Kenyah, Lun Bawang / Lun Dayeh, Punan Bah and Penan ) living on the island have been struggling for decades for their right to preserve their environment from loggers and transmigrant settlers and colonists.
Certain Boer nationalists have asserted that they do not consider themselves a right-wing element of the political spectrum.
Certain stereotypical patterns of breathing have been identified including Cheyne-Stokes a form of breathing in which the patient's breathing pattern is described as alternating episodes of hyperventilation and apnea.
Certain viruses such as Hepatitis B and human papilloma viruses have been found to cause cancer in humans.
Certain experts have noted the shape of a domestic dog's brain case is closer to the coyote's in shape than that of a wolf's.
* Certain kinds of memory leaks, in which a program fails to free memory occupied by objects that have actually become unreachable, which leads to memory exhaustion if such a behavior is repeated indefinitely.
Certain Jewish thinkers, such as Maimonides, believed that concubines are strictly reserved for kings, and thus that a commoner may not have a concubine ; indeed, such thinkers argued that commoners may not engage in any type of sexual relations outside of a marriage.
Certain chemotherapy agents also have a role in the treatment of other conditions, including ankylosing spondylitis, multiple sclerosis, Crohn's disease, psoriasis, psoriatic arthritis, rheumatoid arthritis, and scleroderma.
Certain scholars have argued that she should be seen as an early feminist who efficiently used language to convey that women could play an important role within society.
Certain rules have traditionally been given for this particular type of definition.
* Certain population segments have been historically under-researched ( racial minorities and people with co-morbid diseases ), and thus the RCT restricts generalizing.
Certain aspects of XP have changed since the book Extreme Programming Refactored ( 2003 ) was published ; in particular, XP now accommodates modifications to the practices as long as the required objectives are still met.
Certain of his film related material and personal papers are contained in the Wesleyan University Cinema Archives to which scholars and media experts from around the world may have full access.
Certain insurance products and practices have been described as rent-seeking by critics.
Certain courts, particularly the United States Supreme Court and most state supreme courts, have discretionary jurisdiction, meaning that they can choose which cases to hear from among all the cases presented on appeal.
Certain, often more expensive keyboards have a diode between each intersection, allowing the keyboard microcontroller to accurately sense any number of simultaneous keys being pressed, without generating erroneous ghost keys ..
Certain resolutions of these paradoxes, particularly Graham Priest's dialetheism as formalised in LP, have the law of excluded middle as a theorem, but resolve out the Liar as both true and false.
Certain tree species, such as hemlock, have also been particularly depleted by past logging activity.
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