https://www.selleckchem.com/products/5-ethynyl-2--deoxyuridine.html AIM The aim of this paper was the translation and adaptation to Spanish of the Academic Procrastination Scale-Short Form of McClosky / Yockey, and to determine its preliminary psychometric properties of validity and reliability in a sample of nursing students. METHOD 178 nursing students, 143 female and 35 male, participated in the study. They answered an anonymous and self-administered questionnaire, which contained demographic data, the Academic Procrastination Scale-Short Form (APS-SF) and the Tuckman Procrastination Scale (TPS). RESULTS A Cronbach's alpha coefficient of 0.87 and a two-week test-retest coefficient of 0.89 was obtained. The correlation between the 2administered scales was 0.70. The confirmatory factor analysis shows a suitable fit to the unifactorial model proposed for the original version of the scale. No significant floor or ceiling effects were observed in the APS-SF scores. DISCUSSION The results of the study seem to confirm that the Spanish version of the Brief Scale of Academic Procrastination is a valid and reliable instrument, which, due to its characteristics, can be useful to quickly evaluate procrastinating behaviours related to the academic activities of Spanish-speaking students. In sheep, adequate physiological maternal adaptations to twin fetuses are key for their prenatal development. We hypothesized that there is a relationship between maternal circulating steroid hormone concentration, hematocrit, and patterns of conceptus growth and umbilical artery hemodynamics in twin vs singleton pregnancies. Ewes carrying singletons (n = 6) or twins (n = 7) were selected. Hematocrit, progesterone (P4) and estradiol-17β (E2) concentrations were analyzed. Blood flow of the umbilical artery (UBF) was assessed through Doppler ultrasonography. Ewes carrying twins had a decreased (p = 0.03) hematocrit. There was a tendency (p = 0.08) for ewes carrying twins to have increased P4 fr