CHEST I 93 I 3 I MARCH, 1988 I Supplement 101$ activity. Contractile responses of MPA and SPA to high K , norepinephrine, and serotonin were studied. A regular sequence of changes in response was observed during exposure to chronic hypoxia (Fig 2). Both maximal active wall stress and tension in response to 120 mMK were decreased in MPA of 2-day hypoxic rats (Fig 2A and B). The weight of the seg...

It generally has been thought that the relatively high resting tension characteristic of cardiac tissue resides in structures (collagen, elastin) external to the individual cardiac cells, but the evidence to support this conclusion has been indirect, since the resting tension of intact single cardiac cells has not been determined previously. The purpose of the present investigation was to deter...

The fascial pubovaginal sling for stress urinary incontinence is effective and durable. Various techniques and materials have been developed, including polypropylene tension-free vaginal tape. Contrary to other synthetic slings, tension-free vaginal tape reportedly has a low complication rate.1,2 We report on a case of long-term urinary retention after tension-free vaginal tape surgery, which r...

BACKGROUND Negative mood states are composed of symptoms of depression and anxiety, and by a third factor related to stress, tension and irritability. We sought to clarify the nature of the relationships between the factors by studying twin pairs. METHOD A total of 503 monozygotic twin pairs completed the Depression Anxiety Stress Scales (DASS), an instrument that assesses symptoms of depress...

1. Tension in a resting muscle increases when the muscle is stretched. If the stretch is maintained, the tension decays (stress relaxation). The time course of stress relaxation in the metathoracic second tergocoxal muscle (Tcx2) of the locust Schistocerca americana was found to be adequately described by a multiexponential function with four or more time constants. These constants were indepen...

The purpose of the study was to determine the cell dynamics in periodontal ligament in response to mechanical stress during orthodontic movement. Following Waldo's method, a square sheet of rubber dam was inserted in between the first and second maxillary molars in 10 ddY mice leaving the stress load for 3 hours. After 3 days and at 1 week, cell count on pressure and tension sides of the period...

The tibial shaft is the most common location of stress fractures in athletes. Tibial stress fractures are divided into 2 groups, anterior and posterior, based on location. Posterior tibial cortex fractures are more common and respond well to conservative treatment. Fractures in the anterior cortex are less common, accounting for only 4.6% of stress fractures, and they often heal poorly because ...

The use of unbounded tendons is common in prestressed concrete structures and evaluation of the stress increase in unbonded tendons at ultimate flexural strength of such structure has posed a great challenge over the years. Based on the bending experiment for two-span continuous post-tension beams with unbounded tendons and externally applied CFRP sheets, the monitoring of the stress increment ...

In this paper, an elastic constitutive model based on the Eulerian corotational rate of the logarithmic strain tensor is proposed. Using this model, the large deformation of a closed cycle containing tension, shear, compression and inverse shear is analyzed. Since the deformation path includes a closed cycle and the material is considered as an isotropic elastic material, the normal and shear c...

A toy model and simple model functions are used to exemplify the relation between surface tension, surface energy and surface stress given by Shuttleworth's equation. Variations of the surface tension of charged interfaces must obey Lippmann's equation. Variations Deltaf of the surface stress of electrodes would be either equal to or proportional to and smaller than those variations Deltagamma ...