| 1. |
- Abreu, P., et al.
(författare)
-
Measurement of the gluon fragmentation function and a comparison of the scaling violation in gluon and quark jets
- 2000
-
Ingår i: European Physical Journal C. - : Springer Science and Business Media LLC. - 1434-6044 .- 1434-6052. ; 13:4, s. 573-589
-
Tidskriftsartikel (refereegranskat)abstract
- The fragmentation functions of quarks and gluons are measured in various three-jet topologies in Z decays from the full data set collected with the DELPHI detector at the Z resonance between 1992 and 995. The results at different values of transverse momentum-like scales are compared. A parameterization of the quark and gluon fragmentation functions at a fixed reference scale is given. The quark and gluon fragmentation functions show the predicted pattern of scaling violations. The scaling violation for quark jets as a function of a transverse momentum-like scale is in a good agreement with that observed in lower energy e+e- annihilation experiments. For gluon jets it appears to be significantly stronger. The scale dependences of the gluon and quark fragmentation functions agree with the prediction of the DGLAP evolution equations from which the colour factor ratio CA/CF is measured to be: CA/CF = 2.26 ± 0.09stat. ± 0.06sys. ± 0.12clus.,scale..
|
|
| 2. |
- Cuttini, M, et al.
(författare)
-
End-of-life decisions in neonatal intensive care : physicians' selfreported practices in seven European countries
- 2000
-
Ingår i: The Lancet. - London. - 0140-6736 .- 1474-547X. ; 355:9221, s. 2112-2118
-
Tidskriftsartikel (refereegranskat)abstract
- BackgroundThe ethical issue of foregoing life-sustaining treatment for newborn infants at high risk of death or severe disability is extensively debated, but there is little information on how physicians in different countries actually confront this issue to reach end-of-life decisions. The EURONIC project aimed to investigate practices as reported by physicians themselves.MethodsThe study recruited a large, representative sample of 122 neonatal intensive-care units (NICUs) by census (in Luxembourg, the Netherlands, and Sweden) or stratified random sampling (in France, Germany, the UK, Italy, and Spain) with an overall response rate of 86%. Physicians' practices of end-of-life decision-making were investigated through an anonymous, self-administered questionnaire. 1235 completed questionnaires were returned (response rate 89%).FindingsIn all countries, most physicians reported having been involved at least once in setting limits to intensive care because of incurable conditions (61–96%); smaller proportions reported such involvement because of a baby's poor neurological prognosis (46–90%). Practices such as continuation of current treatment without intensification and withholding of emergency manoeuvres were widespread, but withdrawal of mechanical ventilation was reported by variable proportions (28–90%). Only in France (73%) and the Netherlands (47%) was the administration of drugs with the aim of ending life reported with substantial frequency. Age, length of professional experience, and the importance of religion in the physician's life affected the likelihood of reporting of non-treatment decisions.InterpretationA vast majority of neonatologists in European NICUs have been involved in end-of-life limitation of treatments, but type of decision-making varies among countries. Cultur-related and other country-specific factors are more relevant than characteristics of individual physicians or units in explaining such variability.
|
|
| 3. |
|
|
| 4. |
|
|
| 5. |
- Pedersen, M O, et al.
(författare)
-
Diffusion of N adatoms on the Fe(100) surface
- 2000
-
Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 84:21, s. 4898-4901
-
Tidskriftsartikel (refereegranskat)abstract
- The diffusion of individual N adatoms on Fe(100) has been studied using scanning tunneling microscopy and ab initio density functional theory (DFT) calculations. The measured diffusion barrier for isolated N adatoms is E-d = (0.92 +/- 0.04) eV, with a prefactor of nu(0) = 4.3 x 10(12) s(-1), which is in quantitative agreement with the DFT calculations. Thr; diffusion is strongly coupled to lattice distortions. and. as a consequence, the presence of other N adatoms introduces an anisotropy in the diffusion. Based on experimentally determined values of the diffusion barriers and adsorbate-adsorbate: interactions, the potential energy surface experienced by a N adatom is determined.
|
|
| 6. |
- Rosenblad, Carl, et al.
(författare)
-
In vivo protection of nigral dopamine neurons by lentiviral gene transfer of the novel GDNF-family member neublastin/artemin
- 2000
-
Ingår i: Molecular and Cellular Neuroscience. - : Elsevier BV. - 1044-7431. ; 15:2, s. 199-214
-
Tidskriftsartikel (refereegranskat)abstract
- The glial cell line-derived neurotrophic factor (GDNF)-family of neurotrophic factors consisted until recently of three members, GDNF, neurturin, and persephin. We describe here the cloning of a new GDNF-family member, neublastin (NBN), identical to artemin (ART), recently published (Baloh et al., 1998). Addition of NBN/ART to cultures of fetal mesencephalic dopamine (DA) neurons increased the number of surviving tyrosine hydroxylase (TH)-immunoreactive neurons by approximately 70%, similar to the maximal effect obtained with GDNF. To investigate the neuroprotective effects in vivo, lentiviral vectors carrying the cDNA for NBN/ART or GDNF were injected into the striatum and ventral midbrain. Three weeks after an intrastriatal 6-hydroxydopamine lesion only about 20% of the nigral DA neurons were left in the control group, while 80-90% of the DA neurons remained in the NBN/ART and GDNF treatment groups, and the striatal TH-immunoreactive innervation was partly spared. We conclude that NBN/ART, similarly to GDNF, is a potent neuroprotective factor for the nigrostriatal DA neurons in vivo.
|
|
| 7. |
- Berggren, Erik, 1963-, et al.
(författare)
-
Valfusk och Äppelpaj
- 2000
-
Ingår i: Dagens Nyheter. - 1101-2447. ; 12:12
-
Recension (populärvet., debatt m.m.)
|
|
| 8. |
- Björnsson, Björn Thrandur, 1952, et al.
(författare)
-
Photoperiod regulation of plasma growth hormone levels during induced smoltification of underyearling Atlantic salmon.
- 2000
-
Ingår i: General and comparative endocrinology. - : Elsevier BV. - 0016-6480. ; 119:1, s. 17-25
-
Tidskriftsartikel (refereegranskat)abstract
- Earlier studies have established that increased daylength increases plasma growth hormone (GH) levels during spring smoltification of yearling Atlantic salmon. Recently, the Atlantic salmon aquaculture industry has started the production of underyearling ("summer") smolts. This involves fast juvenile growth on continuous light (24L), the transfer of juveniles over 8 cm in length to short day (12L) for 6 weeks in the summer, followed by transfer to 24L for another 6 weeks before transfer to seawater in late October. Three groups were studied in fresh water from July to the following May in order to elucidate the GH response to this photoperiod manipulation: one group was kept on 24L throughout (long-day group), while the other two groups were exposed to short day from July 15th. Of these, one was brought back onto long day on September 1st (winter group) while the other was kept on short day (short-day group). Plasma GH levels of the long-day group were around 1.6 ng/ml throughout the study. The short-day transfer suppressed GH levels to 0.7 ng/ml within 2 weeks (short-day and winter groups). The long-day transfer (winter group) increased GH levels to 11 ng/ml within 3 weeks, and this elevation of GH levels was sustained for about 3 months, before declining to pretreatment levels. The study demonstrates that underyearling Atlantic salmon react to increased daylength in a way similar to traditional yearling smolts. It also demonstrates for the first time that decreased daylength can suppress plasma GH levels in fish. It is concluded that winter photoperiod manipulation causes an out-of-season initiation and completion of the parr-smolt transformation of underyearling Atlantic salmon and that growth hormone plays a major role in this process.
|
|
| 9. |
|
|
| 10. |
- Engström, Gunnar, et al.
(författare)
-
Distribution and determinants of ischaemic heart disease in an urban population. A study from the myocardial infarction register in Malmo, Sweden
- 2000
-
Ingår i: Journal of Internal Medicine. - : Wiley. - 1365-2796 .- 0954-6820. ; 247:5, s. 588-596
-
Tidskriftsartikel (refereegranskat)abstract
- OBJECTIVE: Age adjusted incidence of myocardial infarction has been found to vary substantially between the residential areas of the city of Malmo. The objective of this study was to assess the extent to which major biological risk factors and socio-economic circumstances account for the differences in incidence of and mortality from myocardial infarction. DESIGN: Ecological study of risk factor prevalence and incidence and mortality from myocardial infarction. SETTING: Seventeen administrative areas in Malmo, Sweden. SUBJECTS: Assessment of risk factor prevalence was based on 28 466 men and women, ranging from 45 to 73 years old, who were recruited as participants in the Malmo Diet and Cancer study. Information on serum lipids was available in a random subsample of 5362 subjects. Information about socio-economic level of the residential area was based on statistics from the Malmo City Council and Statistics Sweden. MAIN OUTCOME MEASURES: Weighted least square regressions between prevalence of risk factors (i.e. smoking, hypertension, obesity, diabetes, hypercholesterolemia and hypertriglyceridemia), a myocardial infarction risk score, a socio-economic score and incidence and mortality from myocardial infarction. RESULTS: The risk factor prevalence and myocardial infarction incidence was highest in areas with low socio-economic level. Prevalence of smoking, obesity and hypertension was significantly associated with myocardial infarction incidence and mortality rates amongst men (all r > 0.60). Prevalence of smoking was significantly associated with incidence and mortality from myocardial infarction amongst women (r = 0.66 and r = 0.61, respectively). A myocardial infarction risk score based on four biological risk factors explained 40-60% of the intra-urban geographical variation in myocardial infarction incidence and mortality. The socio-economic score added a further 2-16% to the explained variance. CONCLUSION: In an urban population with similar access to medical care, well-known biological cardiovascular risk factors account for a substantial proportion of the intra-urban geographical variation of incidence of and mortality from myocardial infarction. The socio-economic circumstances further contribute to the intra-urban variation in disease.
|
|
