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

Two alternatives to the delay line, the Williams tube and Selectron tube, originated in 1946, both using electron beams in glass tubes as means of storage.

Two years later, in 1933, Ruska built an electron microscope that exceeded the resolution attainable with an optical ( lens ) microscope.

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

Two of the primary methods for identifying rocks in the laboratory are through optical microscopy and by using an electron microprobe.

Two mitochondria from mammalian lung tissue displaying their matrix and membranes as shown by electron microscopy

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 logical qubit directions of electron spin and nitrogen kernels spin were used.

Two example eighth-Perturbation theory | order Feynman diagrams that contribute to the electron self-interaction.

Two different variations of electron transport are used during photosynthesis:

Unlike the thermonuclear bomb contained in the Pod ( which is used to destroy the Barrier ) they can become temporarily disabled by " concentrated disbelief " in the reaction " When Hydrogen One and Hydrogen Two are in the presence of Mu Mesons, they fuse into Helium Three, with an energy yield in electron volts of 5. 4 times ten to the fifth power ".

Two basic situations are recognized: ( 1 ) when the electron is initially in a localized state ; ( 2 ) when the electron is initially not strongly localized, and is best represented by a travelling wave.

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 healthy mitochondria from mammalian lung tissue as shown by electron microscopy.

Two electrons need to be passed to an electron acceptor for the process of photosynthesis to proceed.

Two electrons are finally accepted by oxygen in the matrix to complete the electron transport chain.

Two of the three bodies are nuclei and the third is a fast moving electron.

Two double-slit electron diffraction experiments are proposed to discriminate between QM and SEDS

Two main initiation pathways involve electron transfer ( through alkali metals ) and strong anions.

* Two sign changes of the Hall coefficient as electron doping goes from to ( band insulators have only one sign change at )

Two polyphosphide ions, found in and found in K < sub > 5 </ sub > P < sub > 4 </ sub >, are radical anions with an odd number of valence electrons making both compounds paramagnetic.

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

Two recent independent theoretical studies have shown that the variations in Schumann resonance power related to the day-night transition are much smaller than those associated with the peaks of the global lightning activity, and therefore the global lightning activity plays a more important role in the variation of the Schumann resonance power.

Two tones of the same pitch will give maximum sympathetic resonance as all harmonics of both strings will overlap.

Two main categories of magnetic resonance imaging ( MRI ) techniques can be used to measure tissue perfusion in vivo.

Two recent studies have measured brain size per se by means of magnetic resonance imaging ( MRI ) and found correlations with IQ in the. 30 to. 40 range ( Andreasen et al., 1993 ; Willerman, Schultz, Rutledge, & Bigler, 1991 ).

* Two modulation (" AMS ") value outputs, to control any modulatable synthesis parameters in the rest of the Program ( e. g. filter cutoff or resonance, LFO speeds, etc.

Two out of three succeeding flights had body trouble, which was later attributed to an unusual increase of the attack angle due to pitch-roll resonance.

Two of the most commonly specified measures are the cross-section for thermal neutron absorption, and resonance integral which considers the contribution of absorption peaks at certain neutron energies specific to a particular nuclide, usually above the thermal range, but encountered as neutron moderation slows the neutron down from an original high energy.

Two data centers have been established for the collection, indexing, critical evaluation, and dissemination of bibliographies and critical values in the fields of transition probabilities and collision cross sections.

Two regional command centers were merged to create the Central Office for South Vietnam ( Trung ương Cục miền Nam ), a unified communist party headquarters for the South.

Two 1401 systems are being restored to operating order at the Computer History Museum in Mountain View, California, complete with a " false floor " typical of the mainframe era ( and modern data centers ), used to hide cabling.

Two railroad lines, the Monon, which spanned from New Albany to Chicago and the Jeffersonville, Madison, and Indianapolis railroad, provided Clark County and southern Indiana with access to the northern trading centers of Indianapolis and Chicago.

College Park has three city recreation centers — the Wayman & Bessie Brady Recreation Center, the Hugh C. Conley Recreation Center, and the Gody Road Recreation Center ) The 1st Two ( Wayman & Bessie Brady Recreation Center, the Hugh C. Conley Recreation Center were opened in 1956 and named in honor of three prominent city residents.

Two major centers for modeling are the Center for Space Environment Modeling ( CSEM ) and the Center for Integrated Space weather Modeling ( CISM ).

The closest hospitals are the Elliot Hospital, a Level Two trauma center, and Catholic Medical Center, one of the most advanced cardiac care centers in New England.

Two agricultural research centers are located in San Angelo: the Angelo State University Management Instruction and Research Center and the Texas A & M Texas AgriLife Research and Extension Center at San Angelo.

Two more suburban shopping centers were completed in 1949.

Two supporting data centers were also used to control the service.

For the entrance of the Time & Life Building lobby, he created Two Portals ( 1961 ), a 42-by-14-foot mural of alternating glass bands in white and brown that recede into two bronze centers to create an illusion of depth.

Two of these disciples, Clement of Ohrid and Naum of Preslav who were of noble Bulgarian origin, set up educational centers in Pliska and in Ohrid to further the development of Slavonic letters and liturgy.

Two other schools are approved by the BBFI as recognized training centers for its missionaries, Pacific Baptist College in Pomona, California ; and Louisiana Baptist University in Shreveport, Louisiana.

He also mocks some other rehabilitation centers like the Brighton Rehabilitation Center in the song ' Underground ' with the line ' Two weeks in Brighton, I ain't enlightened '.

Two major centers of literary and intellectual activity were Beijing – home to Peking University and Tsinghua University – and Shanghai, with its flourishing publishing sector.

Two centers in the Midi-Pyrenees region of southwest France:

In major industrial centers, workers called for political pluralism, organized committees to defend freedom of the press, and voiced their support for The Two Thousand Words manifesto.

Two new centers were also established.

Two huge shopping centers are located in the technopole.

Two neighborhood centers are each a five-minute walk from campus and the dormitories, featuring shopping centers, banks, and doctors.

Two other centers have been authorized to be set up in Indonesia and Pakistan.

Two large sports centers ( Memorial Stadium and Assembly Hall ) are located in the south-east portion of Champaign.

Two of the city's institutions, the Library Company and the American Philosophical Society, were centers of enlightened thought and scientific inquiry.

Two secure detention centers are located in Hunts Point with a third planned.