While Proust believed that chemical compounds are composed of a fixed ratio of their constituent elements irrespective of the methods of production, Berthollet believed that this ratio can change according to the ratio of the reactants initially taken.

While working toward his goal of improved insecticide, Schrader experimented with numerous compounds, eventually leading to the preparation of tabun.

While pure hydrocarbons undergo certain limited classes of reactions, many more reactions which organic compounds undergo are largely determined by functional groups.

While the etymology is Greek, the oldest extant record of the word itself is the New Latin form ontologia, which appeared in 1606, in the work Ogdoas Scholastica by Jacob Lorhard ( Lorhardus ) and in 1613 in the Lexicon philosophicum by Rudolf Göckel ( Goclenius ); see classical compounds for this type of word formation.

While there are natural sources for all of these species, the concentrations of chlorine and bromine have increased markedly in recent years due to the release of large quantities of man-made organohalogen compounds, especially chlorofluorocarbons ( CFCs ) and bromofluorocarbons.

While almost all reactions have integer-ratio stoichiometry in amount of matter units ( moles, number of particles ), some nonstoichiometric compounds are known that cannot be represented by a ratio of well-defined natural numbers.

While biodegradable simply means an object naturally falls apart into its base components, " compostable " makes the specific demand that the object break down into humus, organic compounds.

While bismuth compounds ( Pepto-Bismol ) decreased the number of bowel movements in those with travelers ' diarrhea, they do not decrease the length of illness.

While these compounds have desirable effects in humans, they cannot be efficiently metabolized in many animals and can lead to cardiac and nervous system problems, and if consumed in high quantities, even lead to death.

While Scheele's experiments generated substances which have long since been found to be hazardous, the compounds and elements he used to start his experiments were dangerous to begin with, especially heavy metals.

While taurine is sometimes called an amino acid, and indeed is an acid containing an amino group, it is not an amino acid in the usual biochemical meaning of the term, which refers to compounds containing both an amino and a carboxyl group.

While this allowed for very little experimental characterization of its properties and possible compounds, theoretical calculations have resulted in many predictions, including some unexpected ones.

While harvesting grapes destined for sparkling wine, premium producers will take extra care to handle the grapes as gently as possible in order to minimize the extraction of harsh phenolic compounds from the skin.

While Emir is a common transliteration in English and other languages, the form Amir is found for numerous compounds ( e. g., admiral ) and names.

While the discovery of bromine and the preparation of many of its compounds was his most conspicuous piece of work, Balard was an industrious chemist on both the pure and applied sides.

While a lot of machine gun rounds and a fair amount of luck were needed to cause critical damage, a single cannon shell could instantly sever essential structural elements, penetrate armour or open up a fuel tank beyond what self sealing compounds could handle, even from a fairly long range.

While there are other compounds, such as silicone and urethane that are stronger and last longer, foam rubber is used because it is much easier to work with.

While still using a chemical preservative, this formulation contains no heavy-metal compounds.

While oxygenic phototrophs use water as an electron donor for phototrophy, Chloroflexus uses reduced sulfur compounds such as hydrogen sulfide, thiosulfate, or elemental sulfur.

While other compounds are used to attract pollinators or herbivores to spread ripe seeds.

While at the time, Hawaiians did wear sandals, it was only for traveling long distances or over heavy terrain, and the obviously Western Classical style of the shoes only compounds their inaccuracy.

" While compounds that produce estrogenic, androgenic, antiandrogenic, and antithyroid actions have been studied, less is known about interactions with other hormones.

While the clinic does offer conventional chemotherapy and ( via an associate center ) radiotherapy, it is best known for its " antineoplaston therapy ", a controversial pharmacological treatment using compounds called antineoplastons, devised by the clinic's founder Stanislaw Burzynski in the 1970s.

While the origin of state-owned automobiles may be obscured, subsequent developments concerning the assignment, use, and management of state automobiles can be related more clearly.

While 2-year-olds are still gaining most of the attention at the track, green horses are starting to go a bit, and Jimmy Cruise has several that can really make it.

While some suppression and some denial are not only necessary but healthy, the worker's clinical knowledge must determine how these defenses are being used, what healthy shifts in defensive adaptation are indicated, and when efforts at bringing about change can be most effectively timed.

While the phonemes can be very easily stated, no one is likely to be satisfied with the statement until phonemic occurrences can be related in some way to morphemic units, i.e. until the morphophonemics is worked out, or at least far enough that it seems reasonable to expect success.

While this influence is a complex matter, depending upon personality factors in the individual as well as upon his social-class experience, there probably are some general statements about social-class background and educational policy that can be made with a fair degree of truth.

While ideas about altruism from one field can have an impact on the other fields, the different methods and focuses of these fields always lead to different perspectives on altruism.

While the Ural – Altaic hypothesis can still be found in encyclopedias, atlases, and similar general references, it has not had any adherents in the linguistics community for decades.

While the engine installation crew works on the second car, the first car can be moved to the hood station and fitted with a hood, then to the wheels station and be fitted with wheels.

While down there, along with the dead, he is shown the place where the wrongly convicted reside, the fields of sorrow where those who committed suicide and now regret it reside, including Aeneas ' former lover, the warriors and shades, Tartarus ( where the titans and powerful non-mortal enemies of the Olympians reside ) where he can hear the groans of the imprisoned, the palace of Pluto, and the fields of Elysium where the descendants of the divine and bravest heroes reside.

While a character with Pattern, Logrus or Conjuration can acquire virtually any object, players can choose to spend character points to obtain objects with particular virtues-unbreakability, or a mind of their own.

While Renaissance artists sought nature to find their style, the Mannerists looked first for a style and found a manner. In Mannerist paintings, compositions can have no focal point, space can be ambiguous, figures can be characterized by an athletic bending and twisting with distortions, exaggerations, an elastic elongation of the limbs, bizarre posturing on one hand, graceful posturing on the other hand, and a rendering of the heads as uniformly small and oval.

While entrance to the Park is free, Gaudí's house, " la Torre Rosa ," — containing furniture that he designed — can be only visited for an entrance fee.

While anagramming is certainly a recreation first, there are ways in which anagrams are put to use, and these can be more serious, or at least not quite frivolous and formless.

While in the city, there are many buses and taxi services one can take to get from place to place, but most of the locals choose to walk to their destinations.

While a spontaneous or induced genetic mutation in bacteria may confer resistance to antimicrobial drugs, genes that confer resistance can be transferred between bacteria in a horizontal fashion by conjugation, transduction, or transformation.

Some scholars believe that the apologetic view of Luke ’ s work is overemphasized and that it should not be regarded as a “ major aim of the Lucan writings .” While Munck believes that purpose of Luke ’ s work is not that clear-cut and sympathizes with other claims, he believes that Luke ’ s work can function as an apology only in the sense that it “ presents a defense of Christianity and Paul ” and may serve to “ clarify the position of Christianity within Jewry and within the Roman Empire .” Pervo disagrees that Luke ’ s work is an apology and even that it could possibly be addressed to Rome because he believes that “ Luke and Acts speak to insiders, believers in Jesus .” Freedman believes that Luke is writing an apology but that his goal is “ not to defend the Christian movement as such but to defend God ’ s ways in history .”

While his views on legitimation are different from Esler, Pervo agrees that Luke ’ s work can be seen as one of legitimation.

While this discussion is limited to the xy-plane, it can easily be extended to higher dimensions.

While they can be a human safety hazard, it is productive for these ecosystems to burn out every once in a while so that new organisms can begin to grow and thrive.

While " distortion " can include arbitrary deformation of an image, the most pronounced modes of distortion produced by conventional imaging optics is " barrel distortion ", in which the center of the image is magnified more than the perimeter ( figure 7a ).