The human retinoblastoma gene (RB1) encodes a protein (Rb) of 105 kilodaltons that can
be phosphorylated. Analysis of Rb metabolism has shown that the protein has a half-life of …

Retinoic acid (RA) activated the extracellular signal-regulated kinase (ERK) 2 mitogen-activated
protein kinase (MAPK) of HL-60 human myeloblastic leukemia cells before causing …

Human marrow cells were processed sequentially by density centrifugation and by velocity
sedimentation in serum-free Percoll gradients in order to purify megakaryocytes and to …

Background Eosinophilic airway inflammation in patients with chronic obstructive pulmonary
disease (COPD) is associated with exacerbations and responsivity to steroids, suggesting …

Background: Chronic obstructive pulmonary disease (COPD) remains a major cause of
morbidity and mortality. Present-day diagnostic criteria are largely based solely on spirometric …

Asphaltenes are known to deposit in both the petroleum recovery and topside refining processes.
The asphaltenes are normally in equilibrium under reservoir conditions. As crude oil is …

Structural and compositional characterization of asphaltenes that were extracted from unstable
crude oils, stable crude oils, and organic solid deposits was performed to elucidate their …

A producer in Alaska had been experiencing asphaltene deposition problems in one well of
a dual string completion, producing from two zones. Laboratory tests performed on both …

We present the selective ionization of acidic components of crude oils and naphthenates by
negative-ion electrospray ionization (ESI) Fourier transform ion cyclotron resonance mass …

Asphaltenes are typically defined by their solubility in benzene and insolubility in pentane
or heptane. They are believed to exist in petroleum crude oil as a colloidal suspension, …