6 research outputs found
Dark Matter Assimilation into the Baryon Asymmetry
Pure singlets are typically disfavored as dark matter candidates, since they
generically have a thermal relic abundance larger than the observed value. In
this paper, we propose a new dark matter mechanism called "assimilation", which
takes advantage of the baryon asymmetry of the universe to generate the correct
relic abundance of singlet dark matter. Through assimilation, dark matter
itself is efficiently destroyed, but dark matter number is stored in new
quasi-stable heavy states which carry the baryon asymmetry. The subsequent
annihilation and late-time decay of these heavy states yields (symmetric) dark
matter as well as (asymmetric) standard model baryons. We study in detail the
case of pure bino dark matter by augmenting the minimal supersymmetric standard
model with vector-like chiral multiplets. In the parameter range where this
mechanism is effective, the LHC can discover long-lived charged particles which
were responsible for assimilating dark matter.Comment: 27 pages, 9 figures, 4 tables; v2, references added, switched to JCAP
format; v3, references added, version published in JCA
304 Capecitabine plus irinotecan (XELIRI) in first line metastatic colorectal cancer (MCRC): update on a phase II trial
Mielograma de ratas com disfunção tireoidiana
The cells of the myelo id, lymphoid , and erythroid lineage s of the bone marrow were quantified in rats with hypo and hyperthyroidism. Fifteen Wistar rats were divided into three groups: hypothyroid (n=5), hyperthyroid (n=5) , and control (n=5). Three months after the onset of the treatment s, euthanasia was performed . Bone marrow was aspirated from femurs of each animal to perform smear s that were stained with Quick Panoptic. T he percentage s of rubroblast, prorubrocyte, metarubrocyte, myeloblast, promyelocytes, metamyelocytes, myel ocytes, segmented, eosinophils, basophils, lymphocytes, plasma cells and monocytes in were determined a total of 500 cells. The bone marrow of animals with hypothyroidism had hypoplasia. The myeloid:erythroid ratio was higher in animals with thyroid dysfun ction. In hypo and hyperthyroidism, there was a significant reduction of the percentage of rubrocyte, metarubrocyte , and lymphocytes and increase of myelocytes and segmented cells. In hypothyroidism, there was a significant increase in the percentage of me tamyelocytes. It is c oncluded that both hypo and hyperfunction of thyroid increase the myeloid:erythroid ratio by increasing the number of cells of the myeloid lineage and reducing the cells of the erythroid lineage