Since 1998, Harvard University wraps some of the valuable statues on its campus, such as this " Harvard Bixi | Chinese stele ", with waterproof covers every winter, in order to protect them from erosion caused by acid rain.

Since Lavoisier's knowledge of strong acids was mainly restricted to oxoacids, such as ( nitric acid ) and ( sulphuric acid ), which tend to contain central atoms in high oxidation states surrounded by oxygen, and since he was not aware of the true composition of the hydrohalic acids ( HF, HCl, HBr, and HI ), he defined acids in terms of their containing oxygen, which in fact he named from Greek words meaning " acid-former " ( from the Greek οξυς ( oxys ) meaning " acid " or " sharp " and γεινομαι ( geinomai ) meaning " engender ").

Since 1998, Harvard University wraps some of the bronze and marble statues on its campus, such as this " Harvard Bixi | Chinese stele ", with waterproof covers every winter, in order to protect them from erosion caused by acid rain ( or, actually, acid snow )

Since the 1990s, SO < sub > 2 </ sub > emissions have dropped 40 %, and according to the Pacific Research Institute, acid rain levels have dropped 65 % since 1976.

Since they derive from a strong acid but weak base, they are both at about pH = 5 ; as a consequence, the morphine salts are mixed with small amounts of NaOH to make them suitable for injection.

Since the start of the 20th century, complexity of total syntheses has been increasing, with examples such as lysergic acid and vitamin B12.

Since they are translated, the amino acid residues involved are restricted to those utilized by the ribosome.

Automobile exhaust gas capture has also been proposed to be economical but would require extensive design changes or retrofitting .< ref name = Musadi2011 > Since carbonic acid in seawater is in chemical equilibrium with atmospheric carbon dioxide, extraction of carbon from seawater has been studied.

Since the concentrations of acid and alkali are known, it is easy to calculate the concentration of hydrogen ions so that the measured potential can be correlated with concentrations.

Since the introduction of nalidixic acid in 1962, more than 10, 000 analogs have been synthesized, but only a handful have found their way into clinical practice.

Since DNA ( deoxyribonucleic acid ) can be modified only before birth, a mutation must have taken place at conception or within an egg such that an animal similar to a chicken, but not a chicken, laid the first chicken eggs.

Since the 1970s, public awareness, environmental sciences, ecology, and technology have advanced to include modern focus points like ozone depletion, global climate change, acid rain, and the potentially harmful genetically modified organisms ( GMOs ).

Since fluidity of the surfactant mixture is also dependent on fatty acid tail length where length leads to increased surfactant fluidity, the change in tail length may indicate a surfactant system adaptation in response to the selection for an effective antiadhesive surfactant in collapsed lungs of diving pinnipeds.

Since the 19th century, all of the acid peat in the Fens has disappeared ; drying and wastage of peats has greatly reduced the depth of the alkaline peat soils and reduced the overall elevation of large areas of the peat fens.

Since citric acid is a multifunctional acid, intermediate ions exist, hydrogen citrate ion, HC < sub > 6 </ sub > H < sub > 5 </ sub > O < sub > 7 </ sub >< sup > 2 −</ sup > and dihydrogen citrate ion, H < sub > 2 </ sub > C < sub > 6 </ sub > H < sub > 5 </ sub > O < sub > 7 </ sub >< sup >−</ sup >.

Since then, the night became a classic and became one of the UK's major acid house nights, known as " Spectrum at Heaven in Charing Cross ".

Since this amino acid is normally the cleavage site for aPC, the mutation prevents efficient inactivation of factor V.

Since fermentation was a major metabolic pathway of cancer cells, Warburg reported cancer cells maintain a lower pH, as low as 6. 0, due to lactic acid production and elevated CO < sub > 2 </ sub >.

Since then it has also pioneered various forms of electronic dance music including dubstep, acid house, drum and bass and trip hop, all of which were in whole or part developed in the United Kingdom.

Since teeth are vulnerable during these acidic periods, the development of dental caries relies heavily on the frequency of acid exposure.

Since 1944 he has also conducted regularly at the San Francisco Opera, where he made his debut with a memorable performance of Verdi's Falstaff.

Since a civilizational crisis involves also a crisis in private interests and in the ruling class, reaction is normally found among those who feel themselves to be among the ruling class.

Since the Connally amendment has the effect of giving the same right to the other party to a dispute with the United States, it also prevents us from using the court effectively.

Since then, there has been a notable increase in the number of stations and also the accumulation of additional data and the development of new techniques for using it, leading to a better understanding of propagation phenomena.

Since you contributed more than half of his support, you may also claim an exemption for him on your return.

Since the sides are also covered up to the spray rails, they are also rough-sanded in that area.

Since marginal costs rise when the wage rate rises, the profit-maximizing price also rises when the public-limit price is elevated, and is likely to remain well above the latter.

Since she also has considerable technical virtuosity and a feeling for music in the romantic tradition, Miss Xydis gave her listeners a good deal of pleasure.

Since perforated tape at the time could record eight bits in one position, it also allowed for a parity bit for error checking if desired.

Since the administrative reforms in Bavaria in the 1970s, the town also encompasses the following Ortsteile:

Since tomatoes are New World plants, they are also fairly new to China and Chinese cuisine.

Since 1977, New Zealand has celebrated Arbor Day on June 5, which is also World Environment Day, prior to then Arbor Day, in New Zealand, was celebrated on August 4 – which is rather late in the year for tree planting in New Zealand hence the date change.

Since 2000, there have also been complete recordings issued or re-issued of the operas Axur Re d ' Ormus, Falstaff, Les Danaïdes, La Locandiera, La grotta di Trofonio, Prima la musica e poi le parole and Il mondo alla rovescia.

Since “ a cappella ” singing brought a new polyphony with instrumental accompaniment, it is not surprising that Protestant reformers who opposed the instruments ( such as Calvin and Zwingli ) also opposed the polyphony.

Since 2002 she has also made numerous television and radio appearances, including as a television presenter.

Since the speed of sound varies with temperature, and is virtually stable with pressure change, sonic anemometers are also used as thermometers.

Since the Oxford Movement there has also been a modest flourishing of Benedictine monasticism in the Anglican Church and Protestant Churches.

Since many bowls look the same, coloured, adhesive stickers or labels are also used to mark the bowls of each team in bowls matches.

Since its inception Beechcraft has resided in Wichita, Kansas, also the home of chief competitor Cessna, the birthplace of Learjet and of Stearman, whose trainers were used in large numbers during WW2.

Since the early 20th century it has been commonly accepted that Old Irish Bel ( l ) taine is derived from a Common Celtic * belo-te ( p ) niâ, meaning " bright fire " ( where the element * belo-might be cognate with the English word bale in ' bale-fire ' meaning ' white ' or ' shining '; compare Anglo-Saxon bael, and Lithuanian / Latvian baltas / balts, found in the name of the Baltic ; in Slavic languages byelo or beloye also means ' white ', as in Беларусь ( White Russia or Belarus ) or Бе ́ лое мо ́ ре Sea ).

Since, in the same verse, the temple has been rebuilt, the book must also be later than 515 BCE.

Since the 1950s, Prince Philip has also added herbaceous borders and a water garden.

Since 1982 the comic, along with The Dandy, has also run " Comic Library " titles.

Since 1995, Costas has also hosted NBC's coverage of the U. S. Open golf tournament.