The Effect of Ageing on the Micro-Creep Properties of Radiation Cross-Linked Materials

Radiation crosslinking of polymeric materials have placed and nowadays in the field of long-term use of loaded products. This article aims to identify the long-term effect of radiation crosslinking on micro-creep properties. The article compares the micro-creep properties of HDPE measured two years ago with the results of tests conducted under the same conditions and on the same samples now. The effect of time on the mechanical properties of the radiation crosslinked materials was demonstrated in short-term tests. These findings demonstrate the positive effect of time on the evaluated parameters.

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Controlled trial of the short- and long-term effect of psychological treatment of post-partum depression

The British Journal of Psychiatry ◽

10.1192/bjp.182.5.412 ◽

2003 ◽

Vol 182 (5) ◽

pp. 412-419 ◽

Cited By ~ 255

Author(s):

Peter J. Cooper ◽

Lynne Murray ◽

Anji Wilson ◽

Helena Romaniuk

Keyword(s):

Primary Care ◽

Postnatal Depression ◽

Post Partum ◽

Psychodynamic Therapy ◽

Term Effect ◽

Short Term ◽

Post Partum Depression ◽

Maternal Mood ◽

Long Term Effect

BackgroundPsychological interventions for postnatal depression can be beneficial in the short term but their longer-term impact is unknown.AimsTo evaluate the long-term effect on maternal mood of three psychological treatments in relation to routine primary care.MethodWomen with post-partum depression (n=193) were assigned randomly to one of four conditions: routine primary care, non-directive counselling, cognitive–behavioural therapy or psychodynamic therapy. They were assessed immediately after the treatment phase (at 4.5 months) and at 9, 18 and 60 months post-partum.ResultsCompared with the control, all three treatments had a significant impact at 4.5 months on maternal mood (Edinburgh Postnatal Depression Scale, EPDS). Only psychodynamic therapy produced a rate of reduction in depression (Structured Clinical Interview for DSM–III–R) significantly superior to that of the control. The benefit of treatment was no longer apparent by 9 months post-partum. Treatment did not reduce subsequent episodes of post-partum depression.ConclusionsPsychological intervention for post-partum depression improves maternal mood (EPDS) in the short term. However, this benefit is not superior to spontaneous remission in the long term.

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A comparison of the effects of body condition and short-term food restriction on the feeding behaviour of sheep

Proceedings of the British Society of Animal Science ◽

10.1017/s0308229600031408 ◽

1996 ◽

Vol 1996 ◽

pp. 174-174

Author(s):

A.M. Sibbald

Keyword(s):

Food Intake ◽

Body Condition ◽

Feeding Behaviour ◽

Food Restriction ◽

Term Effect ◽

Short Term ◽

Daily Food ◽

Long Term Effect ◽

Single Meal

Voluntary food intake is generally inversely related to body condition or fatness in mature sheep (Foot, 1972). Since the intake of pelleted diets by housed sheep consists of a number of discrete feeding bouts or 'meals' (e.g. Bermudez et al., 1989), the relatively long-term effect of body condition on intake will be achieved through changes in feeding behaviour at the level of a single meal. The aim of this experiment was to compare the effects of body condition and short-term food restriction on meal patterns in sheep, to investigate the mechanism by which body condition influences daily food intake.

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A Study of the Long-Term Effect of Malar Fat Repositioning in Face Lift Surgery: Short-Term Success But Long-Term Failure by Sam T. Hamra, M.D.

Plastic & Reconstructive Surgery ◽

10.1097/00006534-200209010-00037 ◽

2002 ◽

Vol 110 (3) ◽

pp. 956-959 ◽

Cited By ~ 3

Author(s):

T. Roderick Hester

Keyword(s):

Term Effect ◽

Short Term ◽

Face Lift ◽

Long Term Effect ◽

Fat Repositioning

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Brassinosteroid-induced de-etiolation of Arabidopsis thaliana seedlings resembles the long-term effects of cytokinins

Functional Plant Biology ◽

10.1071/pp98010 ◽

1998 ◽

Vol 25 (6) ◽

pp. 719 ◽

Cited By ~ 2

Author(s):

Jie Luo ◽

Ji-Chu Chen ◽

Yu-Ju Zhao

Keyword(s):

Arabidopsis Thaliana ◽

Term Effect ◽

Hypocotyl Elongation ◽

Long Term Effects ◽

Short Term ◽

Expression Of Genes ◽

Long Term Effect ◽

In The Wild ◽

Positive Regulators

Cytokinins can cause de-etiolation of Arabidopsis thaliana (L.) Heynh. seedlings growing in the dark. Brassinosteroids (BRs) have been considered to regulate negatively the de-etiolation in dark-grown Arabidopsis seedlings. We show here that epi-brassinolide (epi-BL) can partially produce the phenotype of de-etiolation as caused by treatment with cytokinins in the dark, including the development of leaves and epicotyls in the wild-type and the BR-deficient mutant det2. But BRs cannot inhibit hypocotyl elongation, nor restore all the inhibition caused by cytokinins and light. We have found that there are distinct short term and long term phases of induction of de-etiolation by cytokinins. The short-term effect is probably coupled to ethylene in the inhibition of the hypocotyl elongation; the long-term effect causes morphogenesis of leaves and epicotyls. BRs can only regulate de-etiolation in the long term. We propose that the inhibition of hypocotyl elongation of det2 in darkness is caused by the absence of BR-dependent elongation rather than the inhibition caused by the expression of genes for photomorphogenesis. We propose that BRs resemble cytokinins in regulating de-etiolation as positive regulators, and that the inhibition of hypocotyl elongation and the development of leaves and epicotyls in de-etiolation are independent processes.

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Long-term regulation of hexose uptake by isoproterenol in cultured 3T3 adipocytes

AJP Endocrinology and Metabolism ◽

10.1152/ajpendo.1985.248.6.e706 ◽

1985 ◽

Vol 248 (6) ◽

pp. E706-E711 ◽

Cited By ~ 2

Author(s):

J. P. van Putten ◽

H. M. Krans

Keyword(s):

Protein Synthesis ◽

Prolonged Exposure ◽

Term Effect ◽

Long Term Effects ◽

Fat Cell ◽

Short Term ◽

Long Term Effect ◽

Short Term Exposure ◽

Hexose Uptake

Catecholamines are known to have short-term regulatory effects on fat cell hexose uptake. We examined the long-term effects of catecholamines on the insulin-sensitive 2-deoxyglucose (dGlc) uptake in cultured 3T3-L1 adipocytes. Prolonged exposure (48 h) to isoproterenol (beta-adrenergic agonist) stimulated the basal dGlc uptake up to 90%. The effect was specific, time, concentration, and protein synthesis dependent and reversible. The effect of insulin was unaltered and superimposed on the increase in basal dGlc uptake. The long-term effect of isoproterenol was mimicked by epinephrine, dibutyryl cAMP (DBcAMP), and 1-methyl-3-isobutylxanthine (IBMX). By contrast, short-term exposure to isoproterenol (and epinephrine) induced a protein synthesis-independent increase in basal dGlc uptake (30%) not accompanied by an increase in insulin responsiveness. Moreover, on short-term basis, DBcAMP and IBMX suppressed both the basal and insulin-stimulated uptake up to 50%. Determination of the intracellular nonphosphorylated dGlc during the uptake and of the hexokinase activity revealed that the long-term effect of isoproterenol was most likely due to alterations low in dGlc transport. In conclusion, long-term regulators of hexose uptake are in cultured 3T3-L1 adipocytes, isoproterenol, and other cAMP stimulators. The long-term effect is independent from the short-term regulatory effect of the agents and from the effect of insulin.

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