ABSTRACT
In this Letter, we proposed a new technique for point-by-point fiber Bragg grating (FBG) writing in a static fiber by using a spatial light modulator to control the position of the focal point inside the fiber core. Various types of short-length FBGs (uniform, phase-shifted, and apodized) were demonstrated by this inscription technique. Moreover, the capability to tailor the transverse dimension of a grating pitch from a single point to more complex shapes, such as a wide plane covering a whole fiber core or a transverse ring, was shown.
ABSTRACT
Experiments on goats and rabbits showed that zinc supplement to the diet leads to calcium concentration rise in muscle, bone and blood of animals. However, this rise was not adequate to increase in.zinc consumption. The bulk of alimentary zinc stayed in soluble fraction, dense endogen fraction and infusoria fraction of digesta and stimulated calcium release from food particles, it's accumulation in digesta fractions and calcium utilization on the whole. Authors estimate animal digesta as homeostatic, spatial organized, endogenic formation in which zinc and calcium are functionally dependent through enteral mucosa.
Subject(s)
Calcium/metabolism , Dietary Supplements , Intestinal Absorption/drug effects , Intestinal Mucosa/metabolism , Zinc/pharmacology , Animals , Female , Goats , RabbitsABSTRACT
We have used systematic site-specific protein-DNA photocrosslinking to define interactions between bacterial RNA polymerase (RNAP) and promoter DNA in the catalytically competent RNAP-promoter open complex (RPo). We have mapped more than 100 distinct crosslinks between individual segments of RNAP subunits and individual phosphates of promoter DNA. The results provide a comprehensive description of protein-DNA interactions in RPo, permit construction of a detailed model for the structure of RPo, and permit analysis of effects of a transcriptional activator on the structure of RPo.
