Two chlorophyll molecules are then ionised, producing an excited electron, which then passes onto the photochemical reaction centre.

Two monosaccharides with equivalent molecular graphs ( same chain length and same carbonyl position ) may still be distinct stereoisomers, whose molecules differ in the three-dimensional arrangement of the bonds of certain atoms.

Two water molecules are oxidized by four successive charge-separation reactions by photosystem II to yield a molecule of diatomic oxygen and four hydrogen ions ; the electron yielded in each step is transferred to a redox-active tyrosine residue that then reduces the photoxidized paired-chlorophyll a species called P680 that serves as the primary ( light-driven ) electron donor in the photosystem II reaction center.

Two water molecules and one acyl-CoA ( succinyl-CoA ) enzyme are used in this reaction.

Two adsorbate nitrogen molecules adsorbing onto a tungsten adsorbent from the precursor state around an island of previously adsorbed adsorbate ( left ) and via random adsorption ( right )

Two O < sub > 2 </ sub > molecules then react with the arachidonic acid radical, yielding PGG < sub > 2 </ sub >.

Two cAMP molecules bind to each PKA regulatory subunit.

Two or more molecular entities ( atoms, molecules, or ions ) are described as being isoelectronic with each other if they have the same number of electrons or a similar electron configuration and the same structure ( number and connectivity of atoms ), regardless of the nature of the elements involved.

Two molecules might be considered more similar for instance if their difference in molecular weights is lower than when compared with others.

Two complementary models explain dialysis across the membrane-the three pore model ( in which molecules are exchanged across membranes which filter molecules, either proteins, electrolytes or water, based on the size of the pore ) and the distributed model ( which emphasizes the role of capillaries and the solution's ability to increase the number of active capillaries involved in PD ).

" Two water molecules must be split in order to gain 4 electrons ( as well as O2, the oxygen eudicots require for survival ).

* Two molecules of farnesyl pyrophosphate condense with reduction by NADPH to form squalene-by squalene synthase.

Two phospholipid molecules, one cardiolipin and one phosphatidylethanolamine, are also found in the SdhC and SdhD subunits ( not shown in the image ).

Two ADP molecules are also converted to two ATP and two water molecules via substrate-level phosphorylation.

Two molecules of ALA are then reduced to porphobilinogen ( PBG ), and four molecules of PBG are then coupled, forming protoporphyrin IX.

Two molecules of Apo-CII can attach to each LPL dimer.

Two further hydrogen bonds are formed to water molecules, at the opening of the active site, by the 2 '- OH and 3 '- OH of the substrate.

Two common salts in the form of which piperazine is usually prepared for pharmaceutical or veterinary purposes are the citrate, 3C < sub > 4 </ sub > H < sub > 10 </ sub > N < sub > 2 </ sub >. 2C < sub > 6 </ sub > H < sub > 8 </ sub > O < sub > 7 </ sub > ( i. e. containing 3 molecules of piperazine to 2 molecules of citric acid ), and the adipate, C < sub > 4 </ sub > H < sub > 10 </ sub > N < sub > 2 </ sub >. C < sub > 6 </ sub > H < sub > 10 </ sub > O < sub > 4 </ sub > ( containing 1 molecule each of piperazine and adipic acid ).

Two such molecules, that impedes initiation factors, are CPEB and maskin, which bind to CPE ( cytoplasmic polyadenylation element ).

Two molecules of this subunit are present in each RNA polymerase II.

Example: Two teams in System Admin working together to combine technical and organizational skills in order to better the client experience, thus creating synergy.

Two opposing waves combine to form a standing wave.

Two or even three storeys high, the farmhouses are built to show wealth and independence, and much inventiveness has gone into decorating their interiors, which combine aristocratic fashions with traditional materials and techniques.

Two different Resonance ( chemistry ) | resonance forms of benzene ( top ) combine to produce an average structure ( bottom )

* " Gold Harvest Feeds The World " page 90 Popular Mechanics, July 1949, cutaway illustration of the John Deere open cab one-man self-propelled combine of the type common for decades after World War Two

Two reports by the same authors suggest that triclosan can combine with chlorine in tap water to form chloroform, which the United States Environmental Protection Agency classifies as a probable human carcinogen, meaning it likely causes cancer.

* Teams: Two teams of two players ( teammates play in alternating positions with the opposing team so that teammates are not next to each other ) play and combine their scores.

Two Dobsonians that combine a truss tube, compact " rocker box ", large radius altitude bearings, and a collapsible design.

Two common forms of termination are recombination, where the two radicals combine to form one larger molecule, and disproportionation, where one radical transfers a hydrogen atom to the other, giving an alkene and an alkane.

Two years later, in 1992, the Constructicons ' toys were re-released ( exclusive to Europe ), now in a yellow, purple and grey color scheme, with no individual names for the individual toys and lacking the additional pieces that allowed their original releases to combine into Devastator.

Two years later, in 1992, the Constructicons ' toys were re-released ( exclusive to Europe ), now in a yellow, purple and grey color scheme, with no individual names for the individual toys and lacking the additional pieces that allowed their original releases to combine into Devastator.

Two dishes regarded as distinctively Māori are the boil-up-of pork, potatoes, kūmara, and dumplings, and pork and puha ( sow thistle ) which combine introduced and indigenous foods.

Two sets of intellectual influences combine with those of the history of Western philosophy.

Two new branches will also be opening in 2013 as part of new community recreation centres in Clareview Town Centre and The Meadows, which combine library branches with sports and recreation centres.

Two styles of electron counting are popular and both give the same result.

Two inscriptions were uncovered in the excavations of Kouriouniotis that give the names of winning athletes in the various contests of the Lykaian Games that were held every four years between 320 and 304 BCE.

Two conditions were attached to North ’ s entry: one was that the club had to change their uniform and the other was that they had to give up their recruiting grounds to the Essendon Football Club.

Most of the ancients, including the first two just mentioned, refer to his work by his name: " Pytheas says ..." Two late writers give titles: the astronomical author Geminus of Rhodes mentions ( ta peri tou Okeanou ), literally " things about the Ocean ", sometimes translated as " Description of the Ocean ", " On the Ocean " or " Ocean ;" Marcianus, the scholiast on Apollonius of Rhodes, mentions a ( periodos gēs ), a " trip around the earth " or ( periplous ), " sail around.

Two technical conditions are needed: the manifold has to be orientable, and the form has to be compactly supported in order to give a well-defined integral.

Two plays later, Simms finished the drive with a 13-yard touchdown pass to Bavaro to give the Giants a 16-10 lead.

Two hands give the player more control, while one hand can generate a slice shot, applying backspin on the ball to produce a low trajectory bounce.

Two different 1953 patent applications give " Gray code " as an alternative name for the " reflected binary code "; one of those also lists " minimum error code " and " cyclic permutation code " among the names.

Two attempts at English settlement were subsequently made ( in 1609 and 1610 ), but each was abandoned, as the native inhabitants were not willing to give up their capital without a fight.

Two episodes give different reasons for his alcoholism.

* Eragrostis – Panicum types: Two mitotic division give a 4-nucleate megagametophyte, with cell walls to form either three or four cells.

Two booklets in the Reference section of Harefield library give details of the three recipients of the award.

Two years later, a trust, known as the Mount Kaputar Trust, was formed to give guidance on managing the park.

Two considerably earlier seventeenth-century English manuscript books of recipes give instructions for confections that are recognizable as meringue, though called " white biskit bread " in the book of recipes started in 1604 by Lady Elinor Fettiplace ( c. 1570-c. 1647 ) of Appleton in Berkshire ( now in Oxfordshire ), or called " pets " in the manuscript of collected recipes written by Lady Rachel Fane ( 1612 / 13-1680 ), of Knole, Kent.

In the Two Treatises of Government, John Locke asserts the reason why an owner would give up their autonomy:

Then the Pelóri Mountains will be levelled, the three Silmarils will be recovered from the Earth, sea, and sky, and Fëanor's spirit shall be released from the halls of Mandos to give them to Yavanna, who will break them and rekindle the light of the Two Trees.

Two successive rotations with axes in the xy plane will not necessarily give a rotation whose axis lies in the xy plane, and thus cannot be represented as a point on the sphere.

Two important inscriptions from the first decade of Ramesses ' reign, namely the Abydos Dedicatory Inscription and the Kuban Stela of Ramesses II, consistently give the latter titles associated with those of a Crown Prince only, namely the " king's eldest son and hereditary prince " or " child-heir " to the throne " along with some military titles.

Two of the oldest and best known Chinese temples in Singapore, Thian Hock Keng aka Tian Fu Gong ( belongs to the Hokkien Clan ) and Yueh Hai Ching Temple aka Yue Hai Qing Miao ( belongs to the Teochew & Cantonese Clan ), were both dedicated mainly to Mazu, and in the 19th century were frequented by immigrants who came to give thanks after a safe sea voyage from China.

Two reluctant sponsors were found but McIntyre chose to present himself to the Speaker alone, later writing " I very clearly stated to the people of Motherwell and Wishaw that I would give no allegiance to the London-controlled parties ".< ref >

Two police officers of Ertzaintza said that former nationalist government give them orders to do not act against ETA members and its social environment.

Two chairs are reserved for foreign scholars who are invited to give lectures.

Two years later, when Johnson criticized Landis ' decision to give Ty Cobb and Tris Speaker an amnesty after it surfaced they had bet on a fixed game in 1919, Landis told the American League owners to choose between him and Johnson ; the owners promptly sent Johnson on a sabbatical from which he never really returned.

Two popular stories give origins for the term: the first claims that it arose due to a shortage of handkerchiefs among midshipmen, who would consequently use their sleeves to wipe their noses.