Combining Bound-State Quantum Dynamics Measurements and Characterization of the Driving Pulse in one Experiment

2016 ◽  
Author(s):  
Alexander Blättermann ◽  
Christian Ott ◽  
Andreas Kaldun ◽  
Thomas Ding ◽  
Veit Stooß ◽  
...  
Keyword(s):  
Quantum Dynamics ◽  
Bound State ◽  
Driving Pulse

scholarly journals Direct characterization of quantum dynamics with noisy ancilla

2015 ◽  
Vol 92 (5) ◽  
Author(s):  
Eugene Dumitrescu ◽  
Travis S. Humble
Keyword(s):  
Quantum Dynamics

Characterization of the Cu-bound state of α-lactalbumin

1991 ◽  
Vol 43 (2-3) ◽  
pp. 192
Author(s):  
E. Tieghem ◽  
H. Van Dael ◽  
F. Van Cauwelaert
Keyword(s):  
Bound State

Direct characterization of quantum dynamics with single-photon two-qubit states

2008 ◽  
Vol 77 (3) ◽  
Author(s):  
Wei-Tao Liu ◽  
Wei Wu ◽  
Ping-Xing Chen ◽  
Cheng-Zu Li ◽  
Jian-Min Yuan
Keyword(s):  
Quantum Dynamics ◽  
Single Photon ◽  
Qubit States

Biochemical Characterization of Chloromethane Emission from the Wood-Rotting Fungus Phellinus pomaceus

1998 ◽  
Vol 64 (8) ◽  
pp. 2831-2835 ◽  
Author(s):  
Deepti Saxena ◽  
Saleh Aouad ◽  
Jihad Attieh ◽  
Hargurdeep S. Saini
Keyword(s):  
Atmospheric Chemistry ◽  
Biochemical Characterization ◽  
Active Form ◽  
Methyl Chloride ◽  
Bound State ◽  
Ph Optimum ◽  
Methyl Donors ◽  
Membrane Bound

ABSTRACT Many wood-rotting fungi, including Phellinus pomaceus, produce chloromethane (CH3Cl). P. pomaceus can be cultured in undisturbed glucose mycological peptone liquid medium to produce high amounts of CH3Cl. The biosynthesis of CH3Cl is catalyzed by a methyl chloride transferase (MCT), which appears to be membrane bound. The enzyme is labile upon removal from its natural location and upon storage at low temperature in its bound state. Various detergents failed to solubilize the enzyme in active form, and hence it was characterized by using a membrane fraction. The enzyme had a sharp pH optimum between 7 and 7.2. Its apparent Km for Cl− (ca. 300 mM) was much higher than that for I− (250 μM) or Br− (11 mM). A comparison of theseKm values to the relative in vivo methylation rates for different halides suggests that the realKm for Cl− may be much lower, but the calculated value is high because the CH3Cl produced is used immediately in a coupled reaction. Among various methyl donors tested, S-adenosyl-l-methionine (SAM) was the only one that supported significant methylation by MCT. The reaction was inhibited by S-adenosyl-l-homocysteine, an inhibitor of SAM-dependent methylation, suggesting that SAM is the natural methyl donor. These findings advance our comprehension of a poorly understood metabolic sector at the origin of biogenic emissions of halomethanes, which play an important role in atmospheric chemistry.

scholarly journals Real-time characterization of spectral instabilities in a mode-locked fibre laser exhibiting soliton-similariton dynamics

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Coraline Lapre ◽  
Cyril Billet ◽  
Fanchao Meng ◽  
Piotr Ryczkowski ◽  
Thibaut Sylvestre ◽  
...  
Keyword(s):  
Real Time ◽  
Pulse Shaping ◽  
Phase Evolution ◽  
Bound State ◽  
Fibre Laser ◽  
Fibre Amplifier ◽  
Dissipative Solitons ◽  
Evolution Dynamics ◽  
Mode Locked Lasers

Abstract The study of dissipative solitons in mode-locked lasers reveals a rich landscape of interaction dynamics resulting from the interplay of nonlinearity, dispersion and dissipation. Here, we characterize a range of instabilities in a dissipative soliton fibre laser in a regime where both conventional soliton and similariton propagation play significant roles in the intracavity pulse shaping. Specifically, we use the Dispersive Fourier Transform technique to perform real-time spectral measurements of buildup dynamics from noise to the generation of stable single pulses, phase evolution dynamics of bound state “similariton molecules”, and several examples of intermittent instability and explosion dynamics. These results show that the instabilities previously seen in other classes of passively mode-locked fibre lasers are also observed in the presence of strong nonlinear attraction of similariton evolution in an optical fibre amplifier.

scholarly journals Biochemical characterization of Bacillus thuringiensis cytolytic toxins in association with a phospholipid bilayer

1999 ◽  
Vol 338 (1) ◽  
pp. 185-193 ◽  
Author(s):  
Jinping DU ◽  
Barbara H. KNOWLES ◽  
Jade LI ◽  
David J. ELLAR
Keyword(s):  
Biochemical Characterization ◽  
Bound State ◽  
Phospholipid Bilayer ◽  
Membrane Pore ◽  
Glucose Release ◽  
System A ◽  
Molecular Masses ◽  
Release Assay ◽  
Membrane Bound

The interaction of two Bacillus thuringiensiscytolytic toxins, CytA and CytB, with a phospholipid bilayer and their structure in the membrane-bound state were investigated by proteolysis using phospholipid vesicles as a model system. A toxin conformational change upon membrane binding was detected by comparing the proteolytic profile of membrane-bound toxin and saline-solubilized toxin. When membrane-bound toxin was exposed to protease K or trypsin, novel cleavage sites were found between the α-helical N-terminal half and β-strand C-terminal half of the structure at K154 and N155 in CytA and at I150 and G141 in CytB. N-terminal sequencing of membrane-protected fragments showed that the C-terminal half of the toxin structure comprising mainly β-strands was inserted into the membrane, whereas the N-terminal half comprising mainly α-helices was exposed on the outside of the liposomes and could be removed when liposomes with bound toxin were washed extensively after proteolysis. The C-termini of the membrane-inserted proteolytic fragments were also located by a combination of N-terminal sequencing and measurement of the molecular masses of the fragments by electrospray MS. Using a liposome glucose-release assay, the membrane-inserted structure was seen to retain its function as a membrane pore even after removal of exposed N-terminal segments by proteolysis. These data strongly suggest that the pores for glucose release are assembled from the three major β-strands (β-5, β-6 and β-7) in the C-terminal half of the toxin.

PHOTOEMISSION STUDY OF THE ELECTRONIC STRUCTURE OF SIZE-SELECTED Ptn — CLUSTERS DEPOSITED ON Ag(110)

1993 ◽  
Vol 07 (01n03) ◽  
pp. 556-559 ◽  
Author(s):  
H.-V. ROY ◽  
J. BOSCHUNG ◽  
P. FAYET ◽  
F. PATTHEY ◽  
W.-D. SCHNEIDER
Keyword(s):  
Electronic Structure ◽  
Cluster Size ◽  
Crystal Surface ◽  
Bound State ◽  
In Situ Characterization ◽  
Theoretical Predictions ◽  
Photoemission Study ◽  
Energy Dependent

We report on a photoemission study (XPS, UPS) of the evolution of the electronic structure with cluster size of Pt n ( n = 1-10) clusters deposited on a Ag(110) single crystal surface. The clusters are produced by Xe-ion bombardment of a Pt target. The ionized clusters are mass-selected by a quadrupole mass spectrometer and guided to the substrate by an RF-mode only quadrupole. The substrate is in the center of the analysis chamber allowing in-situ characterization of the supported clusters. Photoemission spectra taken on submonolayer quantities of mass-selected monodispersed Pt clusters indicate individual discrete electronic structure features of the Pt 5d emission. In the atomic-like limit virtual bound state formation with different 5d3/2 and 5d5/2 line broadening is observed which points to an energy dependent Vsd hopping matrix element in agreement with theoretical predictions. With increasing cluster size the splitting between the bonding-like and antibonding-like Pt 5d states reflects the Pt-Pt interaction. The shift of the center of gravity of the Pt 5d state towards the Fermi energy and their concomittant broadening indicate the trend to Pt-metal formation.

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