Viscosity

Publication Title: 
Nature

The evolution of altruism, a behaviour that benefits others at one's own fitness expense, poses a darwinian paradox. The paradox is resolved if many interactions are with related individuals so that the benefits of altruism are reaped by copies of the altruistic gene in other individuals, a mechanism called kin selection. However, recognition of altruists could provide an alternative route towards the evolution of altruism. Arguably the simplest recognition system is a conspicuous, heritable tag, such as a green beard.

Author(s): 
Jansen, Vincent A. A.
van Baalen, Minus
Publication Title: 
Journal of Alternative and Complementary Medicine (New York, N.Y.)

OBJECTIVES: Emerging research is revealing that direct physical contact of the human body with the surface of the earth (grounding or earthing) has intriguing effects on human physiology and health, including beneficial effects on various cardiovascular risk factors. This study examined effects of 2 hours of grounding on the electrical charge (zeta potential) on red blood cells (RBCs) and the effects on the extent of RBC clumping. DESIGN/INTERVENTIONS: SUBJECTS were grounded with conductive patches on the soles of their feet and palms of their hands.

Author(s): 
Chevalier, Gaétan
Sinatra, Stephen T.
Oschman, James L.
Delany, Richard M.
Publication Title: 
Journal of Alternative and Complementary Medicine (New York, N.Y.)

OBJECTIVES: Emerging research is revealing that direct physical contact of the human body with the surface of the earth (grounding or earthing) has intriguing effects on human physiology and health, including beneficial effects on various cardiovascular risk factors. This study examined effects of 2 hours of grounding on the electrical charge (zeta potential) on red blood cells (RBCs) and the effects on the extent of RBC clumping. DESIGN/INTERVENTIONS: SUBJECTS were grounded with conductive patches on the soles of their feet and palms of their hands.

Author(s): 
Chevalier, Gaétan
Sinatra, Stephen T.
Oschman, James L.
Delany, Richard M.
Publication Title: 
Annals of Biomedical Engineering

There is a high incidence of low back pain (LBP) associated with occupations requiring sustained and/or repetitive lumbar flexion (SLF and RLF, respectively), which cause creep of the viscoelastic tissues. The purpose of this study was to determine the effect of creep on lumbar biomechanics and facet joint capsule (FJC) strain. Specimens were flexed for 10 cycles, to a maximum 10 Nm moment at L5-S1, before, immediately after, and 20 min after a 20-min sustained flexion at the same moment magnitude.

Author(s): 
Little, Jesse S.
Khalsa, Partap S.
Publication Title: 
Journal of Biomechanical Engineering

The human facet joint capsule is one of the structures in the lumbar spine that constrains motions of vertebrae during global spine loading (e.g., physiological flexion). Computational models of the spine have not been able to include accurate nonlinear and viscoelastic material properties, as they have not previously been measured. Capsules were tested using a uniaxial ramp-hold protocol or a haversine displacement protocol using a commercially available materials testing device. Plane strain was measured optically.

Author(s): 
Little, Jesse S.
Khalsa, Partap S.
Publication Title: 
Journal of Manipulative and Physiological Therapeutics

BACKGROUND: Training manual therapists in the judgment of spinal stiffness traditionally requires the spines of human volunteers. Presenting the range of stiffness values representative of spines requires both time and resources. When investigating the ability of therapists to judge spinal stiffness, several studies have therefore utilized spine analogues, nonbiological devices designed to present either purely elastic stimuli or viscoelastic stimuli with unknown relative contributions of elastic and viscous components.

Author(s): 
Nicholson, Leslie L.
Adams, Roger D.
Maher, Christopher G.
Publication Title: 
Journal of Manipulative and Physiological Therapeutics

BACKGROUND: Training manual therapists in the judgment of spinal stiffness traditionally requires the spines of human volunteers. Presenting the range of stiffness values representative of spines requires both time and resources. When investigating the ability of therapists to judge spinal stiffness, several studies have therefore utilized spine analogues, nonbiological devices designed to present either purely elastic stimuli or viscoelastic stimuli with unknown relative contributions of elastic and viscous components.

Author(s): 
Nicholson, Leslie L.
Adams, Roger D.
Maher, Christopher G.
Publication Title: 
Biological & Pharmaceutical Bulletin

Tanshen has long been widely used as a traditional Chinese medicine. Tanshinone IIA (Tan IIA) is the most abundant lipophilic constituent of Tanshen which has antitumor activity but the mechanism is poorly understood. Some preliminary reports hypothesized that it is a DNA intercalator and that the furano-o-quinone moiety could produce free radicals responsible for its cytotoxicity. Here the interaction of Tan IIA with DNA was explored in detail using fluorescence, viscosimetry, and molecular modeling.

Author(s): 
Zhang, Zhichao
Zhang, Jing
Jin, Liji
Song, Ting
Wu, Guiye
Gao, Jin
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