Evolution of multiple quantum coherences with scaled dipolar Hamiltonian.

In this article, we introduce a pulse sequence which allows the monitoring of multiple quantum coherences distribution of correlated spin states developed with scaled dipolar Hamiltonian. The pulse sequence is a modification of our previous Proportionally Refocused Loschmidt echo (PRL echo) with phase increment, in order to verify the accuracy of the weighted coherent quantum dynamics. The experiments were carried out with different scaling factors to analyze the evolution of the total magnetization, the time dependence of the multiple quantum coherence orders, and the development of correlated spins clusters.

Bone Regeneration Using Adipose-Derived Stem Cells with Fibronectin in Dehiscence-Type Defects Associated with Dental Implants: An Experimental Study in a Dog Model.

Purpose: To determine the bone regeneration potential of a ceramic biomaterial coated with fibronectin and adipose-derived stem cells covered in three-wall critical-size defects associated with dental implants.

Materials And Methods: In a total of 18 dogs, four dehiscence-type and critical-size defects were created surgically in the edentulous alveolar ridge with the simultaneous placement of dental implants. Defects were randomly regenerated using biomaterials coated with particulate ß-tricalcium phosphate (β-TCP), β-TCP with fibronectin (Fn) (β-TCP-Fn), and β-TCP with a combination of Fn and autologous adipose-derived stem cells (ADSCs) (β-TCP-Fn-ADSCs), leaving one defect as the control.

Assessment of Bone Regeneration Using Adipose-Derived Stem Cells in Critical-Size Alveolar Ridge Defects: An Experimental Study in a Dog Model.

Purpose: To assess bone regeneration potential of a fibronectin- and adipose-derived stem cell-covered ceramic biomaterial in three-wall critical-size alveolar ridge defects.

Materials And Methods: In 18 dogs, four dehiscence-type and critical-size defects were created surgically in the edentulous alveolar ridge. Defects were randomly regenerated using biomaterials coated with particulate β-tricalcium phosphate (β-TCP), β-TCP with fibronectin (Fn) (β-TCP-Fn), and β-TCP with a combination of Fn and autologous adipose-derived stem cells (ADSCs) (β-TCP-Fn-ADSCs), leaving one defect as control.

Experimental quantification of decoherence via the Loschmidt echo in a many spin system with scaled dipolar Hamiltonians.

We performed Loschmidt echo nuclear magnetic resonance experiments to study decoherence under a scaled dipolar Hamiltonian by means of a symmetrical time-reversal pulse sequence denominated Proportionally Refocused Loschmidt (PRL) echo. The many-spin system represented by the protons in polycrystalline adamantane evolves through two steps of evolution characterized by the secular part of the dipolar Hamiltonian, scaled down with a factor |k| and opposite signs. The scaling factor can be varied continuously from 0 to 1/2, giving access to a range of complexity in the dynamics.