Irradiation of amorphous a-Se Ag I and a-Se films by linearly polarized He–Neand Arq ion-laser light was shown 70 15 15 to produce polycrystalline films with linear dichroism, the sign of which is determined by the polarization of the light. Photocrystallization of the films was confirmed by direct structural investigations. Thus, a new phenomenon, the effect of light polarization on the photoc...

The organization of DNA into chromatin is important in the regulation of transcription, by influencing the access of transcription factors to their DNA binding sites. Nuclear factor 1 (NF-1) is a transcription factor which binds to DNA constitutively and which interacts with its cognate DNA site with high affinity. However, this affinity is drastically reduced, approximately 100- to 300-fold, w...

A total of 917 Mycoplasma isolations were made from 4 092 specimens originating from 2 874 cattle in private herds and at AI stations. The percentages of isolations from the different sources were: cervico-vaginal mucus 14,6%, semen 43%, preputial wash 25%, foetuses 3,3% and placentas 15%. Mycoplasma bovigenitalium, the most common isolate, was recovered from 39% of males, 47% of females, 25% o...

By means of the Directive 2014/95/EU, EU established new requirements regarding disclosure non-financial information (NFI). The Spanish Act 11/2018 expands these requirements, imposing mandatory external assurance on NFI. This is a pioneering study in Spain, since it was conducted during first year which mandatory. aim this paper to analyse whether listed companies fulfil requirement and compar...