ABSTRACT
The CERN Axion Solar Telescope has finished its search for solar axions with (3)He buffer gas, covering the search range 0.64 eV â² ma â² 1.17 eV. This closes the gap to the cosmological hot dark matter limit and actually overlaps with it. From the absence of excess x rays when the magnet was pointing to the Sun we set a typical upper limit on the axion-photon coupling of gaγ â² 3.3 × 10(-10) GeV(-1) at 95% C.L., with the exact value depending on the pressure setting. Future direct solar axion searches will focus on increasing the sensitivity to smaller values of gaγ, for example by the currently discussed next generation helioscope International AXion Observatory.
ABSTRACT
We conducted a phase-I study to test the practicability and usefulness of a short (15-30 min) clinical interview for the assessment of cancer patients' spiritual needs and preferences. Physicians assessed the spirituality of their patients using the semi-structured interview SPIR. The interview focuses on the meaning and effect of spirituality in the patient's life and coping system. Visual Analogue Scales (VAS) and Questionnaires were completed following the interview for rating whether SPIR had been helpful or distressing, and to what extent spirituality seemed important in the patient's life and in coping with cancer disease. Thirty oncological outpatients who all agreed to participate were included. The majority wanted their doctor to be interested in their spiritual orientation. Patients and interviewing physicians evaluated the SPIR interview as helpful (patients mean 6.76 +/- 2.5, physicians 7.31 +/- 1.9, scale from 0 to 10) and non-distressing (patients 1.29 +/- 2.5, physicians 1.15 +/- 1.3, scale from 0 to 10). Following the interview, doctors were able to correctly gauge the importance of spirituality for their patients. Patients who considered the interview as very helpful (VAS > 7) were more often female (P = 0.002). There were no differences between patients who evaluated the SPIR as very helpful and those who did not, as far as diagnosis, educational level or belonging to a religious community were concerned. The present study shows that a short clinical assessment of cancer patients' spirituality is well received by both patients and physicians. The SPIR interview may be a helpful tool for addressing the spiritual domain, planning referrals and ultimately strengthening the patient-physician relationship.
Subject(s)
Adaptation, Psychological , Interview, Psychological/standards , Neoplasms/psychology , Patient Satisfaction , Spirituality , Adult , Female , Humans , Male , Middle Aged , Needs AssessmentABSTRACT
Cell division depends on the separation of sister chromatids in anaphase. In yeast, sister separation is initiated by cleavage of cohesin by the protease separase. In vertebrates, most cohesin is removed from chromosome arms by a cleavage-independent mechanism. Only residual amounts of cohesin are cleaved at the onset of anaphase, coinciding with its disappearance from centromeres. We have identified two separase cleavage sites in the human cohesin subunit SCC1 and have conditionally expressed noncleavable SCC1 mutants in human cells. Our results indicate that cohesin cleavage by separase is essential for sister chromatid separation and for the completion of cytokinesis.
Subject(s)
Anaphase , Cell Cycle Proteins/metabolism , Cell Division , Chromosomes/metabolism , Endopeptidases/metabolism , Aneuploidy , Aurora Kinases , Cell Cycle Proteins/chemistry , Cell Cycle Proteins/genetics , Cell Nucleus/ultrastructure , Centromere/metabolism , Chromatids/metabolism , Chromosomal Proteins, Non-Histone , Cyclin B/metabolism , DNA Replication , HeLa Cells , Humans , Karyotyping , Microscopy, Fluorescence , Microscopy, Video , Mutation , Nuclear Proteins , Phosphoproteins , Protein Serine-Threonine Kinases/metabolism , Saccharomyces cerevisiae Proteins , Separase , TransfectionABSTRACT
In yeast, anaphase depends on cohesin cleavage. How anaphase is controlled in vertebrates is unknown because their cohesins dissociate from chromosomes before anaphase. We show that residual amounts of the cohesin SCC1 remain associated with human centromeres until the onset of anaphase when a similarly small amount of SCC1 is cleaved. In Xenopus extracts, SCC1 cleavage depends on the anaphase-promoting complex and separin. Separin immunoprecipitates are sufficient to cleave SCC1, indicating that separin is associated with a protease activity. Separin activation coincides with securin destruction and partial separin cleavage, suggesting that several mechanisms regulate separin activity. We propose that in vertebrates, a cleavage-independent pathway removes cohesin from chromosome arms during prophase, whereas a separin-dependent pathway cleaves centromeric cohesin at the metaphase-anaphase transition.
